Hard or Soft Shut-in : Which is the Best Approach?

Size: px
Start display at page:

Download "Hard or Soft Shut-in : Which is the Best Approach?"

Transcription

1 HARD - SOFT shut-in? Hard or Soft Shut-in : Which is the Best Approach? March '93 INTRODUCTION There is now reasonable acceptance through-out the industry for the use of a hard shut-in procedure following the detection of a kick. Sometimes, however, there may still be disagreement (particularly at remote locations) over which method to use. For this reason Research and Engineering have investigated the hard/soft shut-in issue in order to provide clear reasons why the hard shut-in policy is recommended in the well control manual. The investigation had three main phases : Experimental data was obtained by shutting-in on a simulated kick using a test well facility in Aberdeen. The well was instrumented with downhole pressure measurements and the tests simulated drilling into an overpressured formation. Theoretical analysis of the transient pressures produced when the BOP is shut was developed with Schlumberger Cambridge Research. An engineering report was produced and, following some further analysis, this was later expanded into an SPE paper which was presented at the February 1993 IADC conference in Amsterdam. Some copies of this paper are included at the end of the presentation package. The following material describes the results of the HARD/SOFT shut-in study and is suitable for presentation to clients and at training courses. 1 24/3/93

2 Hard or Soft Shut-in? Several shut-in procedures in use : variants of "Hard", "Soft" Historical approaches uncertain Varying preferences results in confused drill crews Require safety of personnel and well March '93 Several procedures to shut-in the well after detection of a kick are in use today. Mostly these consist of small variations in one of two main approaches - the "hard" or "soft" shut-in. Historically operators have had varying preferences for which shut-inapproach is adopted. Often this has been based of dubious assumptions for which there has been little supporting evidence. Even worse is the situation which often occurs in practice where the operator and drilling contractor have conflicting procedures for shutting in the well after detection of a kick. This results in added confusion to an already stressful situation. It should always be remembered that the final requirement is to provide optimum safety of personnel while maintaining safety of the well. 2 24/3/93

3 Hard shut-in Choke manifold valve CLOSED at BOP closure Advantages stops influx in shortest time simplicity Perceived Disadvantages "water-hammer" pressure pulse March '93 In the case of a HARD shut-in the choke valve is closed when the BOP is closured. The choke is normally in the closed position during drilling mode. This has the following advantages: (a) The influx is stopped in the shortest possible time and therefore minimises the pressure when circulating out the kick. (b) This procedure is simple and quick - there is normally no need to change any valve alignment. The perceived dis-advantage is that a pressure pulse or water hammer effect is produced in the well-bore when the BOP is closed. This has been thought to cause possible formation damage. "Water-hammer" is a general term describing pressure waves produced through liquids in pipes when the flow is rapidly stopped by closing a valve. It can sometimes be heard in domestic water systems - if a tap is closed rapidly a bang can be heard throughout the pipe system. 3 24/3/93

4 Soft shut-in Choke manifold valve OPEN at BOP closure Perceived Advantages reduced pressure pulse Disadvantages increased influx volume greater complexity March '93 In the Soft shut-in method, the choke valve is open at closure of the BOP. This has the following advantages and disadvantages : The advantage of a reduced pressure pulse in the well-bore when the BOP is closed. The main disadvantages are that : (1) A larger influx is obtained due to the delay in fully shutting in the well. Note that this can be a severe disadvantage, especially when the flow from the formation is large, causing higher pressures when the influx is circulated out. (2) The soft shut-in is more complex due to the requirement of ensuring valve alignment before the BOP is closed. Remember that all this takes place at a stressful time, just following the detection of a kick. 4 24/3/93

5 To investigate the effect of the additional time required to use the soft shut-in compared to the hard shut-in, a commercial kick simulator was used to evaluate the consequences of the soft shut-in on the totalkick volume. The kick is detected at 10 bbl in both cases and the pumps are shut-down for a 30 second flow check. The difference between the soft and hard shut-ins is a delay of 50 seconds required to open the failsafes and close the choke. This is a best case estimate and the time difference between the twoshut-in methods will be greater in many practical field situations. The effect of the 50 second additional time to perform the soft shutin results in 1.8 bbl or 12.5 % additional influx in the annulus. The well is then shut in for a 20 minute period after which the choke pressure for the soft shut-in case exceeds that for the hard shut-in case by 60 psi. A greater time difference in shutting-in the well will produce a larger influx, resulting in higher maximum choke pressure. 5 24/3/93

6 BOP 10,000 psi Nitrogen Injection in 1" Coiled Tubing String 9 5/8 Hanging Casing 5" Drill Pipe 2322' (MD) ' (TVD) (Measured from Rig Floor) P T Pressure and temperature measurement 6 1/2" Collars (270') 4700' (MD) (TVD) P T Pressure and temperature measurement 8 1/4" Tri-Cone Bit Packer To investigate the water hammer pressure pulse experimentally, in collaboration with other Schlumberger companies conducted a series of full scale experiments using a 1430m test well. The well was instrumented with pressure transducers at surface, at 708 m and at the bit at 1430m. This enabled accurate measurement of the water-hammer pressure pulse at surface and in the wellbore. Gas was introduced at the bit through coiled tubing. Care was taken to ensure that conditions were realistic. For example, a pressure injection profile was used to simulate drilling into a formation of 200 psi (1.38 MPa) overpressure and permeability of 100 md (9.87e -14 m 2 ). For both the hard and soft shut-in cases, 10 bbls were injected into the annulus at which stage the annular preventer was closed. 6 24/3/93

7 The surface pressure measurements obtained during the hard and soft shut-in procedures are shown in this slide. The main points are : Closure of the BOP produces a "water hammer" pulse after which pressures continue to rise until bottom hole pressure (BHP) stabilises. In the case of the soft shut-in the pressure is lower until the choke is closed, after which the pressures build in a similar way to that for the hard shut-in except that the influx volume is now greater. To examine the pressure pulse in more detail, the bottom part of the diagram shows the time range between 110 and 150 seconds expanded. The pulse amplitudes are 57 psi for the hard shut-in case and 20 psi in the soft shut-in case. Note that the water-hammer pressure pulse occurs BEFORE there is any significant increase in annular pressure. In both cases (soft AND hard shutin) the pressure pulse amplitudes are small compared to the net pressure rise after bottom hole pressure has stabilised. [ Note however that you cannot see the final shut-in pressure for the soft shut-in case as it does not start to build towards the final value until after the choke is closed at 230 seconds] 7 24/3/93

8 The downhole pressure measurements corresponding to the surface measurements shown in the previous slide are shown here at the casing "shoe" (708m) and at the bit (1430m). The water hammer pulse amplitude is reduced to a slight shoulder on the pressure ramp at 130 seconds. This shoulder is about 36 psi in amplitude and is less than the surface pulse amplitude due to loss of energy of the wave as it travels down the annulus. The effect of the water hammer pulse is even less significant compared to the normal annular pressure build than at surface. It could also be noted that there is a reduction in pressure at the bit BEFORE the well is shut-in due to reduction in hydrostatic head as gas enters the annulus. 8 24/3/93

9 Why is the amplitude of the pressure pulse so small? The flow of gas/fluid from the formation causes a mud flow at velocity U1 from the annulus (see left-hand wellbore figure). The BOP acts as a valve. If the valve were to close instantly (middle diagram) then a pressure pulse is produced which propagates down the wellbore. The pulse amplitude is given approximately by the first equation (this is described in detail in the enclosed SPE paper). "c" is the velocity of sound in the mud, "p" is the mud density and "u1" is the mud velocity at surface due to the influx from the formation (The mud pumps are not active at this stage). In practice the BOP does not close instantly and there is an effective closure time, "Tc", during which there is an increasing constriction of the annulus. For most practical situations, during the BOP close time "Tc", some of the surface pressure wave will have travelled down the well, reflected from the bottom and returned to surface. tr is the round trip travel time. The effect is to reduce the pressure wave amplitude by the ratio "tr/tc" according to the bottom right equation. 9 24/3/93

10 Results Summary Surface measured water hammer : P(hard) = 57 psi, P(soft) = 20 psi. Surface theory : P(hard) = 50 psi, P(soft) = 16 psi. Difference at casing shoe < 36 psi Simulated effect of additional influx : 60 psi higher surface pressure 12.5 % higher pit gain March '93 This is a summary of experimental and theoretical pressure pulse amplitudes for the experimental tests and corresponding theoretical predictions. Measured results for hard and soft cases are as shown. There is good agreement with the theoretical predictions which are derived in detail in the paper. At the casing shoe depth of 708m, the amplitude of the water hammer pulse is even lower than at surface. It is less than 36 psi, which represents a small shoulder on the normal pressure build-up. The simulated effect of the additional influx was shown in slide 5. This resulted in 60 psi higher annular pressure which is GREATER than the amplitude of the water hammer pulse. Note that the 60 psi is potentially more serious as it ADDS TO the final shut-in pressure, whereas the water-hammer pulse occurs BEFORE any significant annular pressure increase. Remember that there was also a predicted 12.5% increase in pit gain due to the difference in shut-in method (assuming a difference in timing of only 50 seconds, which is a best case example) /3/93

11 When is a Hard Shut-in Hard? No reduction in P for tr > Tc : BOP closure is very rapid (fast ram operation). Hole is very deep. Depth limit for pressure reduction : hole depth < 6750 m (for Tc = 10s). For the experiment, if there was NO reflected wave : P 120 psi P is still less than the final shut-in pressure. March '93 When does a hard shut-in produce the maximum pressure amplitude? A previous slide showed that the pressure pulse amplitude is reduced by the ratio tr/tc, so there is significant reduction in the pulse amplitude if the pressure wave round-trip time "tr" is less than the effective BOP closure time "Tc". What does this mean in terms of hole depth? The pressure wave velocity was derived as 1350 m/s (see paper). For the experiment described in this presentation, an annular preventer was used. Taking a conservative estimate for effective BOP closure time as 10 seconds implies that there will be significant pressure pulse reduction for hole depths up to over 6700 m. This covers most operational situations and in practice it will often be more than this producing an even lower pressure pulse amplitude. However, even if there is no significant pressure pulse reduction due to the upward travelling wave (eg extremely rapid ram operation), then the pressure pulse amplitude is still less than the typical shut-in pressure. For example, there was 120 psi predicted "water-hammer" in the case studied in the experiment compared to an annular shut-in pressure of over 200 psi /3/93

12 Conclusions Theory and experiment show small "water hammer" pulse in practical situations SOFT shut-in little improvement to pressure pulse significant effect from additional influx HARD shut-in "water-hammer" smaller than shut-in pressure rise formation exposed to lower net pressure March '93 Main conclusions are as outlined on the slide. The issues relating to SOFT and HARD are again separated following the scheme used in slides 3 and 4. The HARD/SOFT shut-in issue has been investigated theoretically, through the use of a kick simulator and experimentally using downhole pressure measurements. All the results are consistent. The effect of the pressure pulse produced during the hard shut-in was shown to be less than the higher pressures produced by the additional influx in the soft shut-in case /3/93

13 Field Implications Results favour HARD shut-in HARD shut-in results in : - minimum confusion - less influx volume - lower annular pressures Safety of personnel and equipment without risk to the well. March '93 Final conclusions emphasising the field implications. The aim is to maintain safety of personnel and equipment without risk to the well /3/93

14 It could be useful to finish with the default choke valve arrangement for drilling mode as shown in the well control manual. After all, this is what it all boils down to in practice...! 14 24/3/93

15 Possible Questions What if contractor and operator disagree on shut-in procedure? decide at pre-spud meeting. Higher mud velocity than during experiment? more important to shut-in rapidly pulse is larger but is still likely to be small compared to shut-in pressure rise. Effect of closing choke in soft shut-in? pressure pulse produced effect is a delayed water-hammer. March '93 Finally, some possible questions... Q - What happens if the operator and contractor disagree on shut-in procedure? A - The shut-in procedure should always be agreed at the pre-spud meeting as it is very important that there are no conflicting requirements during the kick detection/shut-in operations. will recommend the use of the hard shut-in procedure for the reasons described in the presentation. Q - What happens if the influx is larger and gas expansion produces a higher mud velocity than during the experiment? A - Firstly, the large influx is most likely to be produced by a high flow rate from the producing formation so it is even more important that the well is shut-in as rapidly as possible without any further influx. We have shown that the pulse amplitude is small in comparison to the final shut-in pressures and this is even more likely to be the case for a large influx. The pressure pulse amplitude is governed by the equations shown in slide 9 and a higher mud velocity will produce a larger pressure pulse. However, since the amplitude also depends on the ratio tr/tc and the gas/mud interface will reflect some of the pressure pulse causing a reduction in tr, the pulse amplitude is likely to be reduced from the maximum value. Q - Does closing the choke in the soft shut-in produce a pressure pulse? A - Yes, using the soft shut-in only delays when the pulse occurs. The pressure pulse when closing the choke can be large as the choke can close more rapidly than the BOP. Note : It may be worth making this point anyway /3/93

W I L D W E L L C O N T R O L PRESSURE BASICS AND CONCEPTS

W I L D W E L L C O N T R O L PRESSURE BASICS AND CONCEPTS PRESSURE BASICS AND CONCEPTS Pressure Basics and Concepts Learning Objectives You will be familiarized with the following basic pressure concepts: Defining pressure Hydrostatic pressure Pressure gradient

More information

DAY ONE. 2. Referring to the last question, what mud weight would be required to BALANCE normal formation pressure?

DAY ONE. 2. Referring to the last question, what mud weight would be required to BALANCE normal formation pressure? DAY ONE 1. Normal formation pressure gradient is generally assumed to be: A..496 psi/ft B..564 psi/ft C..376 psi/ft D..465 psi/ft 2. Referring to the last question, what mud weight would be required to

More information

SUBSEA KILL SHEET EXERCISE No. 5

SUBSEA KILL SHEET EXERCISE No. 5 Subsea Kill Sheet Exercise No. 5 SUBSEA KILL SHEET EXERCISE No. 5 Name: Date: Complete the Subsea vertical kill sheet provided on pages 2 and 3. Then answer questions 1 to 12. Please round calculations

More information

Practice Exam IADC WellSharp Driller and Supervisor

Practice Exam IADC WellSharp Driller and Supervisor Workover & Completion Day 4 1. In a workover operation of a shut in well a Lubricator is being used together with a Wireline BOP / Wireline Valve. Which Barrier is classified as the Primary Barrier? A.

More information

Study Guide IADC WellSharp Driller and Supervisor

Study Guide IADC WellSharp Driller and Supervisor Times to Flow Check: Before pulling out of the hole Before pulling BHA into the BOP When bit is pulled into the casing Increase in cuttings at shakers with same ROP On connections Upon abnormal trip tank

More information

1. The well has been shut in on a kick and the kill operation has not started.

1. The well has been shut in on a kick and the kill operation has not started. Well Control Methods Day 2 1. The well has been shut in on a kick and the kill operation has not started. Shut in drill pipe pressure Shut in casing pressure 500 psi 700 psi After stabilization, both pressures

More information

Dilution-Based Dual Gradient Well Control. Presented at the 2011 IADC Dual Gradient Workshop, 5 May 2011 by Paul Boudreau, Dual Gradient Systems LLC

Dilution-Based Dual Gradient Well Control. Presented at the 2011 IADC Dual Gradient Workshop, 5 May 2011 by Paul Boudreau, Dual Gradient Systems LLC Dilution-Based Dual Gradient Well Control Presented at the 2011 IADC Dual Gradient Workshop, 5 May 2011 by Paul Boudreau, Dual Gradient Systems LLC In this very short presentation, we will Review Dilution-based

More information

Blowout during Workover Operation A case study Narration by: Tarsem Singh & Arvind Jain, OISD

Blowout during Workover Operation A case study Narration by: Tarsem Singh & Arvind Jain, OISD 1. Introduction An incident of gas leakage from a well took place during workover operations. Subsequently, the gas caught fire on the fourth day in which twelve persons were injured. Two contract workers,

More information

Well Control Modeling Software Comparisons with Single Bubble Techniques in a Vertical Well

Well Control Modeling Software Comparisons with Single Bubble Techniques in a Vertical Well Well Control Modeling Software Comparisons with Single Bubble Techniques in a Vertical Well Jace R. Larrison, P.E. Blowout Engineers, LLC Recent advances in well control modeling simulators have incorporated

More information

IWCF Equipment Sample Questions (Combination of Surface and Subsea Stack)

IWCF Equipment Sample Questions (Combination of Surface and Subsea Stack) IWCF Equipment Sample Questions (Combination of Surface and Subsea Stack) 1. Given the volumes below, how much hydraulic fluid will be required to carry out the following operations (no safety margin)?

More information

Drilling Efficiency Utilizing Coriolis Flow Technology

Drilling Efficiency Utilizing Coriolis Flow Technology Session 12: Drilling Efficiency Utilizing Coriolis Flow Technology Clement Cabanayan Emerson Process Management Abstract Continuous, accurate and reliable measurement of drilling fluid volumes and densities

More information

Worked Questions and Answers

Worked Questions and Answers Worked Questions and Answers A Learning Document for prospective Candidates For the Rotary Drilling Well Control Test Programme Copyright, IWCF June 2000 Revision No.1, November 2000 IWCF 2000 page 1 of

More information

Acoustic Liquid Level Testing of Gas Wells

Acoustic Liquid Level Testing of Gas Wells European Conference Gas Well Deliquification 28-30 September 2009, Hampshire Hotel, The Netherlands Acoustic Liquid Level Testing of Gas Wells Originally Presented OKC POS 2009 - SPE 120643 Lynn Rowlan

More information

W I L D W E L L C O N T R O L CIRCULATION & WELL CONTROL

W I L D W E L L C O N T R O L CIRCULATION & WELL CONTROL CIRCULATION & WELL CONTROL Learning Objectives You will learn: The importance of pump rates and pressures during well control operations Pressure relationships Basic calculations necessary in well control

More information

WILD WELL CONTROL WARNING SIGNS OF KICKS

WILD WELL CONTROL WARNING SIGNS OF KICKS WARNING SIGNS OF KICKS Warning Signs of Kicks Learning Objectives You will learn the warning signs that indicate the well may be kicking: Warning signs of kicks False kick indicators You will also learn

More information

VOLUMETRIC METHODS and STRIPPING OPERATIONS

VOLUMETRIC METHODS and STRIPPING OPERATIONS VOLUMETRIC METHODS and STRIPPING OPERATIONS WELL CONTROL SCHOOL Muscat, Oman Training Center VOLUMETRIC METHODS and STRIPPING OPERATIONS The material contained here, is based on the best sources available

More information

W I L D W E L L C O N T R O L SHUT-IN PROCEDURES

W I L D W E L L C O N T R O L SHUT-IN PROCEDURES SHUT-IN PROCEDURES Shut-in Procedures Learning Objectives You will learn general shut-in procedures: For surface BOPs. For subsea BOPs. You will learn to interpret shut-in pressures and be able to perform

More information

Why Do Not Disturb Is a Safety Message for Well Integrity

Why Do Not Disturb Is a Safety Message for Well Integrity Why Do Not Disturb Is a Safety Message for Well Integrity Presented at the Practical Well Integrity Conference 9-10 December, 2014 in Houston By Ron Sweatman, Principal Advisor, Reservoir Development Services,

More information

Petr 311 Wellbore pressures and Kick Control

Petr 311 Wellbore pressures and Kick Control etr 311 Wellbore pressures and Kic Control Reeber b. 05D Consider the wellbore static hydraulic syste The pressures in the drill string and the annulus can be represented as a U-tube. The su of the pressures

More information

International Well Control Forum. IWCF Drilling Well Control Syllabus Level 3 and 4 March 2017 Version 7.0

International Well Control Forum. IWCF Drilling Well Control Syllabus Level 3 and 4 March 2017 Version 7.0 International Well Control Forum IWCF Drilling Well Control Syllabus and 4 March 2017 Version 7.0 IWCF Drilling Well Control Syllabus and 4 Contents Guidance Notes... 5 1.1. Introduction... 5 1.2. Who

More information

August 21, Deepwater MPD / PMCD

August 21, Deepwater MPD / PMCD August 21, 2011 Deepwater MPD / PMCD Managed Pressure Drilling (MPD) Pressure held on top of riser while drilling. Drill in overbalance condition Pressurized Mud Cap Drilling (PMCD) Pressure of mud column

More information

The SPE Foundation through member donations and a contribution from Offshore Europe

The SPE Foundation through member donations and a contribution from Offshore Europe Primary funding is provided by The SPE Foundation through member donations and a contribution from Offshore Europe The Society is grateful to those companies that allow their professionals to serve as

More information

IWCF Equipment Sample Questions (Surface Stack)

IWCF Equipment Sample Questions (Surface Stack) IWCF Equipment Sample Questions (Surface Stack) 1. During a well control operation 4000 psi was shut in below the middle pipe rams. Ram type BOP data: Model: Cameron U type Rated Working Pressure: 15000

More information

Extended leak off testing

Extended leak off testing Extended leak off testing Rev: 1.0 03/01/01 Purpose To ensure minimal operational time and risk exposure to personnel, process, production and equipment. The following extended leak off test procedures

More information

BLOCK: CB-ONN-2010/8 GUJRAT-INDIA

BLOCK: CB-ONN-2010/8 GUJRAT-INDIA Well Control Manual Bharat PetroResources Limited BLOCK: CB-ONN-2010/8 GUJRAT-INDIA Prepared By: EnQuest PetroSloutions Pvt. Ltd. Contents 1.0.0 Definitions 2.0.0. Causes of Kicks 3.0.0. Kick indications

More information

Understanding pressure and pressure

Understanding pressure and pressure CHAPTER 1 1-1 PRESSURE BASICS Remember to think downhole. The concepts provided in this section cover the foundations for good well control. Understanding pressure and pressure relationships is important

More information

HydroPull. Extended-Reach Tool. Applications

HydroPull. Extended-Reach Tool. Applications Extended-Reach Tool HydroPull This tool incorporates a cycling valve that momentarily interrupts the flow to create water-hammer pressure pulses inside coiled or jointed tubing used in horizontal well

More information

ECD Reduction Tool. R. K. Bansal, Brian Grayson, Jim Stanley Control Pressure Drilling & Testing

ECD Reduction Tool. R. K. Bansal, Brian Grayson, Jim Stanley Control Pressure Drilling & Testing ECD Reduction Tool R. K. Bansal, Brian Grayson, Jim Stanley Control Pressure Drilling & Testing Drilling Engineering Association, Fourth Quarter Meeting November 20, 2008 1 Presentation outline Description

More information

GEOTHERMAL WELL COMPLETION TESTS

GEOTHERMAL WELL COMPLETION TESTS GEOTHERMAL WELL COMPLETION TESTS Hagen Hole Geothermal Consultants NZ Ltd., Birkenhead, Auckland, New Zealand. ABSTRACT This paper reviews the measurements that are typically made in a well immediately

More information

Casing Design. Casing Design. By Dr. Khaled El-shreef

Casing Design. Casing Design. By Dr. Khaled El-shreef Casing Design By Dr. Khaled El-shreef 1 Casing Design CONTENTS Function of Casing Casing Types & Tools Strength Properties Casing Specification Casing Design 2 1 RUNNING AND CEMENTING CASING Reasons for

More information

Acoustic Troubleshooting of Coal Bed Methane Wells

Acoustic Troubleshooting of Coal Bed Methane Wells Gas Well Deliquification Workshop Sheraton Hotel, February 29 March 2, 2016 Acoustic Troubleshooting of Coal Bed Methane Wells O. Lynn Rowlan and Dieter Becker lynn@echometer.com Introduction Distance

More information

Well Control Drill Guide Example Only. Drill Guide is the list of drills, questions and attributes that are in DrillPad.

Well Control Drill Guide Example Only. Drill Guide is the list of drills, questions and attributes that are in DrillPad. Well Control Drill Guide Example Only Drill Guide is the list of drills, questions and attributes that are in DrillPad. This Well Control Drill Guide will be used in conjunction with the rig-specific well

More information

Rig Math. Page 1.

Rig Math. Page 1. Page 1 The Calculator and Main Keyboard Display Numerical 10-key pad used for entering numerical values Trigonometric Functions These keys will be used where wellbore angle is an issue These are the keys

More information

RPSEA UDW Forum June 22 & 23, Secure Energy for America

RPSEA UDW Forum June 22 & 23, Secure Energy for America RPSEA UDW Forum June 22 & 23, 2010 Secure Energy for America PROJECT TEAM RPSEA Operator Advisory Committee Anadarko Chevron Shell ConocoPhillips Subcontractors IntecSea NOV CTES General Marine Contractors

More information

Air and Gas Drilling

Air and Gas Drilling Air and Gas Drilling Air and Gas Drilling It is a technique in which the more common drilling fluids, (water or mud) are replaced by highly compressible Air or Natural gas. But Compressibility makes pressure

More information

Step-Rate Formation Integrity Test Method for Geothermal Wells

Step-Rate Formation Integrity Test Method for Geothermal Wells GRC Transactions, Vol. 41, 2017 Step-Rate Formation Integrity Test Method for Geothermal Wells William M. Rickard, Ozgur Balamir and Ernesto Rivas Geothermal Resource Group, Inc. services@geothermalresourcegroup.com

More information

NEW PROGRAM! OIL AND GAS TECHNOLOGY PROGRAM

NEW PROGRAM! OIL AND GAS TECHNOLOGY PROGRAM NEW PROGRAM! PROGRAM Mechanical Maintenance MODEL H-IRT-1 Industrial Refrigeration Trainer MODEL H-RIG-1C Rigging Systems Trainer MODEL H-IMTS-1 Industrial Maintenance Training System MODEL H-FP-223-14

More information

Offshore Managed Pressure Drilling Experiences in Asia Pacific. SPE paper

Offshore Managed Pressure Drilling Experiences in Asia Pacific. SPE paper Offshore Managed Pressure Drilling Experiences in Asia Pacific SPE paper 119875 Authors: Steve Nas, Shaun Toralde, Chad Wuest, SPE, Weatherford Solutions Sdn Bhd, SPE, Weatherford Indonesia SPE, Weatherford

More information

Modern Perforating Techniques: Key to Unlocking Reservoir Potential

Modern Perforating Techniques: Key to Unlocking Reservoir Potential Modern Perforating Techniques: Key to Unlocking Reservoir Potential DEVEX 2016 0052 Andy Martin Perforating Domain Advisor Schlumberger Aberdeen martin17@slb.com +44 7802 495068 Presentation Outline Introduction:

More information

AN ANALYSIS ON HIGH PRESSURE DYNAMIC CALIBRATORS USED IN THE DEFENSE AREAS

AN ANALYSIS ON HIGH PRESSURE DYNAMIC CALIBRATORS USED IN THE DEFENSE AREAS AN ANALYSIS ON HIGH PRESSURE DYNAMIC CALIBRATORS USED IN THE DEFENSE AREAS Sung Soo HongPresenter Agency for Defense Development, Taean, 357-942, South Korea sungsoo@add.re.kr Abstract Up to now, there

More information

WellCAP IADC WELL CONTROL ACCREDITATION PROGRAM

WellCAP IADC WELL CONTROL ACCREDITATION PROGRAM WellCAP IADC WELL CONTROL ACCREDITATION PROGRAM WELL SERVICING OPERATIONS (WIRELINE, COILED TUBING & SNUBBING) CORE CURRICULUM AND RELATED FORM WCT-2WSI INTRODUCTORY LEVEL For information on how an course

More information

DRILLSCENE PROACTIVE DRILLING DECISIONS

DRILLSCENE PROACTIVE DRILLING DECISIONS DRILLSCENE PROACTIVE DRILLING DECISIONS RISE TO THE CHALLENGE OF REAL-TIME DRILLING CONTROL Today s oil and gas drilling operations present significant technical challenges in remote locations and increasingly

More information

INTERPRETATION NOTE ISSUED UNDER THE PETROLEUM DRILLING REGULATIONS (CNR 1150/96)

INTERPRETATION NOTE ISSUED UNDER THE PETROLEUM DRILLING REGULATIONS (CNR 1150/96) BOP CLASSIFICATION SYSTEM FOR ONSHORE NEWFOUNDLAND AND LABRADOR INTERPRETATION NOTE ISSUED UNDER THE PETROLEUM DRILLING REGULATIONS (CNR 1150/96) PREPARED BY THE PETROLEUM RESOURCE DEVELOPMENT DIVISION

More information

OCEAN DRILLING PROGRAM

OCEAN DRILLING PROGRAM BIH OCEAN DRILLING PROGRAM www.oceandrilling.org Scientifi c Application Packers A packer is an inflatable rubber element that inflates to seal the annular space between the drill string and the borehole

More information

Perforating Options Currently Available in Horizontal Shale Oil and Gas Wells. Kerry Daly, Global BD Manager- DST TCP

Perforating Options Currently Available in Horizontal Shale Oil and Gas Wells. Kerry Daly, Global BD Manager- DST TCP MENAPS 2013 Perforating Options Currently Available in Horizontal Shale Oil and Gas Wells Kerry Daly, Global BD Manager- DST TCP MENAPS 13-17 WELL FLOW MANAGEMENT TM Scope/ Contents: MENAPS 13-17 Study

More information

Deepwater Horizon Incident Internal Investigation

Deepwater Horizon Incident Internal Investigation Not all Information has been verified or corroborated. Subject to review based on additional information or analysis. Deepwater Horizon Incident Internal Investigation 1 Areas of Discussion Investigation

More information

BANDAR PANJI-1 WELL CONTROL INCIDENT REPORT

BANDAR PANJI-1 WELL CONTROL INCIDENT REPORT BANDAR PANJI-1 WELL CONTROL INCIDENT REPORT EXECUTIVE SUMMARY I was requested by management to review the Banjar Panji-1 drilling operations from the conception of the Integrated Drilling Management approach

More information

W I L D W E L L C O N T R O L FLUIDS

W I L D W E L L C O N T R O L FLUIDS FLUIDS Fluids Learning Objectives You will learn about different fluids that can be used in well control. You will become familiar with the characteristics and limitations of fluids. You will learn general

More information

Kicks Controlling Techniques Efficiency in Term of Time

Kicks Controlling Techniques Efficiency in Term of Time Engineering, 2017, 9, 482-492 http://www.scirp.org/journal/eng ISSN Online: 1947-394X ISSN Print: 1947-3931 Kicks Controlling Techniques Efficiency in Term of Time Ali K. Darwesh, Thorkild Maack Rasmussen,

More information

Early Kick Detection Through Liquid Level Monitoring in the Wellbore J.J. Schubert, SPE, Texas A&M University, and J.C. Wright, SPE, Conoco, Inc

Early Kick Detection Through Liquid Level Monitoring in the Wellbore J.J. Schubert, SPE, Texas A&M University, and J.C. Wright, SPE, Conoco, Inc IADC/SPE 39400 Early Kick Detection Through Liquid Level Monitoring in the Wellbore J.J. Schubert, SPE, Texas A&M University, and J.C. Wright, SPE, Conoco, Inc Copyright 1998, IADC/SPE Drilling Conference

More information

High Pressure Continuous Gas Circulation: A solution for the

High Pressure Continuous Gas Circulation: A solution for the Gas Well Deliquification Workshop Sheraton Hotel, February 20 22, 2017 High Pressure Continuous Gas Circulation: A solution for the Pressure Dependent Permeability of the Haynesville Shale? Bill Elmer,

More information

A New and Simplified Method for Determination of Conductor Surface Casing Setting Depths in Shallow Marine Sediments (SMS)

A New and Simplified Method for Determination of Conductor Surface Casing Setting Depths in Shallow Marine Sediments (SMS) AADE-07-NTCE-41 A New and Simplified Method for Determination of Conductor Surface Casing Setting Depths in Shallow Marine Sediments (SMS) Paknejad, A., Texas A&M University; Schubert, J., Texas A&M University

More information

PowerDrive X6. Rotary Steerable System for high-performance drilling and accurate wellbore placement

PowerDrive X6. Rotary Steerable System for high-performance drilling and accurate wellbore placement Rotary Steerable System for high-performance drilling and accurate wellbore placement The PowerDrive X6 RSS maintains control under the most difficult conditions, bringing the benefits of rotary steerable

More information

OPTIMUM SELECTION OF WELL CONTROL METHODS

OPTIMUM SELECTION OF WELL CONTROL METHODS OPTIMUM SELECTION OF WELL CONTROL METHODS Md AHAMMAD SHARIF Assistant professor, Department of Petroleum Engineering, GIET College of Engineering, Rajahmundry. Dr. S. SRIGOWRI REDDY Professor, GIET College

More information

DUO-SQUEEZE H LCM Mixing Tables and Operating Procedures

DUO-SQUEEZE H LCM Mixing Tables and Operating Procedures BAROID DUO-SQUEEZE H LCM Mixing Tables and Operating Procedures Prepared for: Prepared by: Submitted by: Submittal Date: All Customers Sharath Savari, Donald L. Whitfill Halliburton January 2014 1 Copyright

More information

UNIT 2 PATTERNS OF NATURAL

UNIT 2 PATTERNS OF NATURAL UNIT 2 PATTERNS OF NATURAL FLOW Flow through the Reservoi r 1. The fluids in the reservoir are trapped III the pores of the formation rock. CASING t CEMENT In this reservoir, the fluids are trapped in

More information

WellCAP IADC WELL CONTROL ACCREDITATION PROGRAM

WellCAP IADC WELL CONTROL ACCREDITATION PROGRAM WellCAP IADC WELL CONTROL ACCREDITATION PROGRAM WELL SERVICING OPERATIONS SNUBBING CORE CURRICULUM AND RELATED FORM WCT-2SS SUPERVISORY LEVEL The purpose of the core curriculum is to identify a body of

More information

Along-string pressure, temperature measurements hold revolutionary promise for downhole management

Along-string pressure, temperature measurements hold revolutionary promise for downhole management Along-string pressure, temperature measurements hold revolutionary promise for downhole management IT S WIDELY KNOWN that the majority of stuck pipe incidents occur while pulling out of hole. If we can

More information

Squeeze Cementing. Brett W. Williams Cementing Technical Advisor January 2016 Tulsa API Meeting

Squeeze Cementing. Brett W. Williams Cementing Technical Advisor January 2016 Tulsa API Meeting Squeeze Cementing Brett W. Williams Cementing Technical Advisor January 2016 Tulsa API Meeting Definition Squeeze Cementing is the process of applying hydraulic pressure to force or squeeze a cement slurry

More information

MPD Technique in Haynesville Shale Delivers Significant Value in Over Pressured Zones, A Case Study on Four Wells.

MPD Technique in Haynesville Shale Delivers Significant Value in Over Pressured Zones, A Case Study on Four Wells. AADE-11-NTCE-55 MPD Technique in Haynesville Shale Delivers Significant Value in Over Pressured Zones, A Case Study on Four Wells. Serkan Cenberlitas, Jim Crenshaw, and Ferhat Gumus, Weatherford International;

More information

Faculty of Science and Technology. Master Thesis. Writer: Audun Tufte Veisene (Writer s signatures)

Faculty of Science and Technology. Master Thesis. Writer: Audun Tufte Veisene (Writer s signatures) Faculty of Science and Technology Master Thesis Study program/ Specialization: Petroleum Engineering/ Drilling Technology Spring semester, 2014 Open Writer: Audun Tufte Veisene (Writer s signatures) Faculty

More information

Captains Meeting 2009 Introduction to Well Testing- Expro. Edwin Schoorl

Captains Meeting 2009 Introduction to Well Testing- Expro. Edwin Schoorl Captains Meeting 2009 Introduction to Well Testing- Expro Edwin Schoorl Agenda Oil and Gas presence Well construction Well testing Welltest System Welltest Equipment Welltest Video Questions Oil and gas

More information

Best Practices - Coiled Tubing Deployed Ball Drop Type Perforating Firing Systems

Best Practices - Coiled Tubing Deployed Ball Drop Type Perforating Firing Systems Best Practices - Coiled Tubing Deployed Ball Drop Type Perforating Firing Systems As a result of a recent job incident utilizing a Ball Drop Type firing system deployed on coiled tubing, the following

More information

WellCAP IADC WELL CONTROL ACCREDITATION PROGRAM

WellCAP IADC WELL CONTROL ACCREDITATION PROGRAM WellCAP IADC WELL CONTROL ACCREDITATION PROGRAM WIRELINE OPERATIONS CORE CURRICULUM AND RELATED FORM WCT-2WLF FUNDAMENTAL LEVEL The purpose of the core curriculum is to identify a body of knowledge and

More information

WELL SCAVENGER. Versatile wellbore clean-up tool for the most demanding operations

WELL SCAVENGER. Versatile wellbore clean-up tool for the most demanding operations WELL SCAVENGER Versatile wellbore clean-up tool for the most demanding operations WELL SCAVENGER: A versatile wellbore cleanup tool for flowrestricted applications The inability to recover wellbore debris

More information

Commentary on the book by Andrew Hopkins. By Graham Dalzell

Commentary on the book by Andrew Hopkins. By Graham Dalzell Commentary on the book by Andrew Hopkins By Graham Dalzell How we drill oil wells The disaster itself how it happened; (anonymised)- oil, well and drilling companies Andrew s conclusions on the Human,

More information

Colorado Oil and Gas Conservation Commission

Colorado Oil and Gas Conservation Commission Colorado Oil and Gas Conservation Commission http://cogcc.state.co.us/ FORM 5A Completed Interval Report INDUSTRY TRAINING Denver, Colorado November 27, 2012 Form 5A Completed Interval Report Introduction

More information

Well Testing Operations. Turkey, Istanbul, Points Taksim Hotel. Training Course : One Weeks Training Course In. As Under Details :

Well Testing Operations. Turkey, Istanbul, Points Taksim Hotel. Training Course : One Weeks Training Course In. As Under Details : Training Course : Well Testing Operations One Weeks Training Course In Turkey, Istanbul, Points Taksim Hotel As Under Details : Mohammad Issa External Training Coordinator 0096597535000 Tel. : 00965 22610021

More information

APPENDIX A1 - Drilling and completion work programme

APPENDIX A1 - Drilling and completion work programme APPENDIX A1 - Drilling and completion work programme Information about the well and drilling To the extent possible, the international system of units (SI) should be adhered to, and the drilling programme

More information

The Alberta Energy Regulator (AER) has approved this directive on January 31, Introduction Purpose of This Directive...

The Alberta Energy Regulator (AER) has approved this directive on January 31, Introduction Purpose of This Directive... Directive 008 Release date: January 31, 2018 Effective date: January 31, 2018 Replaces previous edition issued February 29, 2016 Surface Casing Depth Requirements The Alberta Energy Regulator (AER) has

More information

SPE/IADC Abstract

SPE/IADC Abstract SPE/IADC 125311 Pressurized Mud Cap Drilling Drastically Reduces Non-Productive Time in Soka Field, South Sumatera Michael Runtuwene, Sanny Suprihono, and Dany Rizka, SPE, Medco E&P Indonesia, Andi Eka

More information

AADE 2009NTCE-04-04: PRACTICAL ASPECTS AND VALUE OF AUTOMATED MPD IN HPHT WELLS

AADE 2009NTCE-04-04: PRACTICAL ASPECTS AND VALUE OF AUTOMATED MPD IN HPHT WELLS sudden appearance of permeable sequences abnormally pressured to higher than anticipated levels in an already narrow margin. 2009 NATIONAL TECHNICAL CONFERENCE & EXHIBITION, NEW ORLEANS, LOUISIANA AADE

More information

The Diagnosis of Well Control Complications during Managed Pressure Drilling

The Diagnosis of Well Control Complications during Managed Pressure Drilling Louisiana State University LSU Digital Commons LSU Master's Theses Graduate School 213 The Diagnosis of Well Control Complications during Managed Pressure Drilling Brian Piccolo Louisiana State University

More information

Acoustic Techniques to Monitor and Troubleshoot Gas-lift Wells

Acoustic Techniques to Monitor and Troubleshoot Gas-lift Wells 37 th Gas-Lift Workshop Houston, Texas, USA February 3 7, 2014 Acoustic Techniques to Monitor and Troubleshoot Gas-lift Wells Carrie-Anne Taylor, Engineer Lynn Rowlan, Engineer Echometer Company Feb. 3-7,

More information

Advanced Intermittent Gas Lift Utilizing a Pilot Valve

Advanced Intermittent Gas Lift Utilizing a Pilot Valve Gas Well Deliquification Workshop Sheraton Hotel, Denver, Colorado February 29 March 2, 2016 Advanced Intermittent Gas Lift Utilizing a Pilot Valve Matt Young Technical Sales Manager Intermittent Gas Lift

More information

TROUBLESHOOT ROD PUMPED WELLS USING TUBING FLUID LEVEL SHOTS

TROUBLESHOOT ROD PUMPED WELLS USING TUBING FLUID LEVEL SHOTS 10 th Annual Sucker Rod Pumping Workshop Renaissance Hotel Oklahoma City, Oklahoma September 16-19, 2014 TROUBLESHOOT ROD PUMPED WELLS USING TUBING FLUID LEVEL SHOTS John Sparks, COG OPERATING LLCU Lynn

More information

Performance and Value of the invision System : Offshore in Coiled Tubing Operations

Performance and Value of the invision System : Offshore in Coiled Tubing Operations Performance and Value of the invision System : Offshore in Coiled Tubing Operations Case Study #0004 Date November 01 21, 2017 Location Gulf of Mexico, Deep Water Introduction Intelligent Wellhead Systems

More information

Gas Lift Workshop Doha Qatar 4-88 February Gas Lift Optimisation of Long Horizontal Wells. by Juan Carlos Mantecon

Gas Lift Workshop Doha Qatar 4-88 February Gas Lift Optimisation of Long Horizontal Wells. by Juan Carlos Mantecon Gas Lift Workshop Doha Qatar 4-88 February 2007 Gas Lift Optimisation of Long Horizontal Wells by Juan Carlos Mantecon 1 Long Horizontal Wells The flow behavior of long horizontal wells is similar to pipelines

More information

DRILLING MANAGED PRESSURE REGIONAL OUTLOOK: EAST AFRICA REDUCED EMISSION COMPLETIONS SHALE TECHNOLOGY REVIEW

DRILLING MANAGED PRESSURE REGIONAL OUTLOOK: EAST AFRICA REDUCED EMISSION COMPLETIONS SHALE TECHNOLOGY REVIEW MARCH 2014 / DEFINING TECHNOLOGY FOR EXPLORATION, DRILLING AND PRODUCTION / WorldOil.com MANAGED PRESSURE DRILLING How automated MPD enables drilling of an impossible well in Mexico REGIONAL OUTLOOK: EAST

More information

Next Generation Quartz Pressure Gauges

Next Generation Quartz Pressure Gauges Next Generation Quartz Pressure Gauges Rick Puccio, Ph.D. Senior Scientist Quartzdyne Houston, TX March 2, 2016 Outline Quartz Pressure Gauge Introduction Gauge Size Reduction Long Term Pressure Drift

More information

RESEARCH OF BLOCKAGE SEGMENT DETECTION IN WATER SUPPLY PIPELINE BASED ON FLUID TRANSIENT ANALYSIS ABSTRACT

RESEARCH OF BLOCKAGE SEGMENT DETECTION IN WATER SUPPLY PIPELINE BASED ON FLUID TRANSIENT ANALYSIS ABSTRACT RESEARCH OF BLOCKAGE SEGMENT DETECTION IN WATER SUPPLY PIPELINE BASED ON FLUID TRANSIENT ANALYSIS Ying Xu 2, Yuebin Wu 1, Liang Chen 1, Yun Guo 2, Wei Wang 1 and Zhe Ding 2 1 School of Architecture, Harbin

More information

Extreme Overbalance, Propellant OR Extreme Underbalance. When and how EOP, Propellant or EUP could effectively improve the well s perforation

Extreme Overbalance, Propellant OR Extreme Underbalance. When and how EOP, Propellant or EUP could effectively improve the well s perforation Extreme Overbalance, Propellant OR Extreme Underbalance When and how EOP, Propellant or EUP could effectively improve the well s perforation The first 130 years of perforating 1865, Tin torpedos filled

More information

SURFACE CASING SELECTION FOR COLLAPSE, BURST AND AXIAL DESIGN FACTOR LOADS EXERCISE

SURFACE CASING SELECTION FOR COLLAPSE, BURST AND AXIAL DESIGN FACTOR LOADS EXERCISE SURFACE CASING SELECTION FOR COLLAPSE, BURST AND AXIAL DESIGN FACTOR LOADS EXERCISE Instructions Use the example well data from this document or the powerpoint notes handout to complete the following graphs.

More information

New power in production logging

New power in production logging New power in production logging Locating the zones where fluids enter the wellbore in a producing or injecting well is an important aspect of production logging. It is relatively straightforward to establish

More information

The Developing Design of the Blowout Preventer in Deep Water

The Developing Design of the Blowout Preventer in Deep Water The Developing Design of the Blowout Preventer in Deep Water IADC World Drilling 2011 Conference & Exhibition 15-16 June 2011, Bella Centre, Copenhagen Eric Brown Project Manager National Oilwell Varco

More information

Chapter 4 Key Findings. 4 Key Findings

Chapter 4 Key Findings. 4 Key Findings Chapter 4 Key Findings 211 4 Key Findings 212 Chapter 4 Key Findings This summarizes the key findings of the investigation team based on its extensive review of available information concerning the Macondo

More information

What are the Well Control Complications While Drilling with Casing or Liner? Tawfik Elshehabi and H. Ilkin Bilgesu, West Virginia University

What are the Well Control Complications While Drilling with Casing or Liner? Tawfik Elshehabi and H. Ilkin Bilgesu, West Virginia University AADE-16-FTCE-79 What are the Well Control Complications While Drilling with Casing or Liner? Tawfik Elshehabi and H. Ilkin Bilgesu, West Virginia University Copyright 2016, AADE This paper was prepared

More information

Niko Deepwater Weatherford MPD DODI Ocean Monarch Nelson Emery Niko Indonesia Drilling Superintendent

Niko Deepwater Weatherford MPD DODI Ocean Monarch Nelson Emery Niko Indonesia Drilling Superintendent Niko Deepwater Weatherford MPD DODI Ocean Monarch Nelson Emery Niko Indonesia Drilling Superintendent 26 Feb - 2014 SPE Thailand 1 Outline Drivers for MPD: 1. Safety of personnel in remote operations 2.

More information

W I L D W E L L C O N T R O L AIR DRILLING

W I L D W E L L C O N T R O L AIR DRILLING AIR DRILLING Air Drilling Learning Objectives You will learn the basics of: Air drilling equipment Types of air drilling Differences between mud and air drilling You will learn how to apply well control

More information

Intermittent Gas Lift Utilizing a Pilot Valve

Intermittent Gas Lift Utilizing a Pilot Valve 39 th Gas-Lift Workshop Houston, Texas, USA May 16 20, 2016 Intermittent Gas Lift Utilizing a Pilot Valve Matt Young Technical Sales Manager May 16 20, 2016 2015 Gas-Lift Workshop 1 Intermittent Gas Lift

More information

Optimising Hydraulic Energy to Dramatically Improve Lateral Reach

Optimising Hydraulic Energy to Dramatically Improve Lateral Reach Optimising Hydraulic Energy to Dramatically Improve Lateral Reach What Affects Reach? Build angle Size of completion CT size Drag Mechanical Fluid Debris in well BHA size End load CT size End load Buoyancy

More information

MASTER S THESIS. A Discussion of Well Control Methods. Faculty of Science and Technology. Study program/ Specialization: Spring semester, 2013

MASTER S THESIS. A Discussion of Well Control Methods. Faculty of Science and Technology. Study program/ Specialization: Spring semester, 2013 Faculty of Science and Technology MASTER S THESIS Study program/ Specialization: Petroleum Engineering Spring semester, 2013 Open Writer: Øystein Røssland (Writer s signature) Faculty supervisor: Professor

More information

Using Gas Lift to Unload Horizontal Gas Wells

Using Gas Lift to Unload Horizontal Gas Wells Gas Well Deliquification Workshop Sheraton Hotel, Denver, Colorado February 27 March 2, 211 Using Gas Lift to Unload Horizontal Gas Wells Rob Sutton Marathon Oil Company Conventional Gas Lift Application

More information

Chapter 5 HORIZONTAL DRILLING

Chapter 5 HORIZONTAL DRILLING Chapter 5 HORIZONTAL DRILLING Chapter 5 How much money am I about to put on the table for a horizontal well? Did I do sufficient planning? Keys to Successful Horizontal Wells Multi-disciplined teams working

More information

1. The principle of fluid pressure that is used in hydraulic brakes or lifts is that:

1. The principle of fluid pressure that is used in hydraulic brakes or lifts is that: University Physics (Prof. David Flory) Chapt_15 Thursday, November 15, 2007 Page 1 Name: Date: 1. The principle of fluid pressure that is used in hydraulic brakes or lifts is that: A) pressure is the same

More information

Subsea Safety Systems

Subsea Safety Systems Subsea Safety Systems The ELSA-HP has been developed to service the high pressure horizontal tree completion and intervention market. With systems designed and qualified up to 15,000 psi, 250 degf and

More information

Acoustic Liquid-Level Determination of Liquid Loading in Gas Wells

Acoustic Liquid-Level Determination of Liquid Loading in Gas Wells Gas Well De-Liquification Workshop February 28 - March 2, 2005 Acoustic Liquid-Level Determination of Liquid Loading in Gas Wells Robert Lestz, Eddie Bruner Lynn Rowlan ChevronTexaco OBJECTIVE: 1. Observe

More information

Dynamic Underbalance Perforating

Dynamic Underbalance Perforating Dynamic Underbalance Perforating Subset of underbalance perforating. Uses volume of gun and sometimes added surge chambers to create downhole flow surge without flow to surface. Last for a few seconds,

More information

MOCS. Multiple Opening Circulation Sub. Fluid Bypass Valve

MOCS. Multiple Opening Circulation Sub. Fluid Bypass Valve MOCS Multiple Opening Circulation Sub Fluid Bypass Valve 1 Applications BHA Protection o o Pumping LCM Spotting Acid Work-over and completions o o o Well bore cleanout Fluid displacements Bottoms-up circulation

More information

DRILLING HOSE SOLUTIONS

DRILLING HOSE SOLUTIONS DRILLING HOSE SOLUTIONS HIGH PRESSURE FLEXIBLE LINES FOR A WIDE RANGE OF DRILLING APPLICATIONS HIGH QUALITY - HIGH STANDARD WE DELIVER ACCORDING TO THE HIGHEST LEVELS OF SPECIFICATIONS AND STANDARDS WITH

More information