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

Transcription

1 Niko Deepwater Weatherford MPD DODI Ocean Monarch Nelson Emery Niko Indonesia Drilling Superintendent 26 Feb SPE Thailand 1

2 Outline Drivers for MPD: 1. Safety of personnel in remote operations 2. Twelve (12) of sixteen (16) wells Carbonate projects 3. Safely handle gas in riser compared to diverter safer for personnel - protect environment from diverting 4. Ability for < 8.5 ppg SBM to drill clays in Carbonate 5. Utilize MPD seal to mimic GOM SSBOP closures during drilling of balloon formations 6. Use ECD to drill / ppg over ECD for connections to efficiently drill well sections less circulate times 2

3 Superintendents Network Teleconference May 21, 2003 (HOU) Participants: G. Anthony, M. Bunyak, S. Furry, M. Brown, B. Carlson, A. Djamil, N. Emery, G. Olivera, E. Harness, J. Orndorff, L. Phelps and E. Dore Deepwater Gulf of Mexico Eddie Dore Since our last teleconference call, the Discoverer Spirit Drillship has completed drilling the Bohr #1 well, Mississippi Canyon Block 637, in 4066 of water. The well was drilled to 26,900 in 122 days, which were 38 days over AFE days and approximately $22 million over budget. There were many Unocal Deepwater records set on this well, such as 10 casing string (including two expandable strings that both leaked) to get to TD, losing approximately 60,000 bbls of SBM, over 250 closures on the annular preventer during drilling making connections on the stack due to ballooning plus well control incidents, etc. We were not proud of any of these records but as you can see in below attachment, we still out performed most of the competition. The Shell s Deep Mensa well took a total of 350 days. 3

4 Proposed Pananda 1 (19, 685 TD / 7,430 WD) Diamond Ocean Monarch Pananda - 1 PROPOSED Rig elevation - 86' Water depth - 7,430' 7,815' - 30" X 1.00" X 1.50" 26" riserless section - SW / sweeps 9.8 ppg LOT 10,450' - 20" 169 # X-56 Leopard 17 1/2" section ppg SBM 11.4 ppg LOT 12,600' /8" 88.2 # P-110 VAM TVD 12 1/4" X 13 1/2" section ppg SBM 12.9 ppg LOT 15,000' /4" 60 # P-110 VAM FJL 10 5/8" X 11 5/8" section ppg SBM 14.1 ppg LOT 17,500' - 9 5/8"" 53.5 # P-110 AB-HDL 7", 29 ppf, P-110, Vam Top 8 1/2" section ppg SBM 19,685' - TD (+ 350 F) 4

5 10 5/8 X 11 5/8 16,766 w/ 12.3 ppg ppg ECD ppg ESD w/ SBP-- Continue to drill 10 5/8 X 11 5/8 w/ 12.3 ppg 850 GPM from ft to ft in MPD mode while monitoring flow in and flow out, pressure and trip tank. Flow thru AFT & FWD lines and bypass choke. Flow thru gut line via Coriolis. ECD = ppg. GPM PSI RPM = 140 WOB TRQ ECD BGD CG (16,587 ) Niko SBM Mud Properties: O/W 83/17 HPHT 2.0 /3.0 Alk Lime WPS K - Record section water intrusion 5

6 10 5/8 X 11 5/8 17,200 w/ 12.3 ppg ppg ECD ppg ESD w/ SBP--- Continue to drill 10 5/8 X 11 5/8 w/ 12.3 ppg 850 GPM from ft to ft in MPD mode flow thru AFT & FWD lines thru gutline and bypass choke to Coriolis = ppg ECD. Hold 320 psi on connection (12.7 ppg EMW). GPM PSI RPM WOB TRQ ECD BGD CG (17,170 ) **Reduced pump rate observing ECD on PWD and increased MW from 12.3 to 12.7 ppg w/ 16.0 ppg pill on bottom for 9 5/8 liner run and set 6

7 Fingerprint - 9 5/8 17,208 w/ 13.2 ppg Pak Nelson, Attached is MPD pressure 13.2ppg for 8-1/2 section with various flow rate. Attached document is for 700gpm + 160gpm on the boost. And below is all rate and pressure we get during test for your reference Returns coming up forward flow line through gutline to Coriolis and returning to header box. 500GPM + 160GPM on the boost - SBP 36psi. RCD pressure 117psi. 550GPM + 160GPM on the boost - SBP 39psi RCD pressure 133psi 600GPM + 160GPM on the boost - SBP 39psi RCD pressure 145 psi 700GPM + 160GPM on the boost - SBP 46psi RCD pressure 166 psi Returns coming up forward flow line through both chokes to Coriolis returning to header box. 500GPM + 160GPM on the boost - SBP 46psi RCD pressure 129psi 550GPM + 160GPM on the boost - SBP 52psi RCD pressure 145psi 600GPM + 160GPM on the boost - SBP 55psi RCD pressure 155psi 700GPM + 160GPM on the boost - SBP 66psi RCD pressure 166psi Returns coming up both flow lines through gutline to Coriolis meter returning to header box. 700GPM + 160GPM on the boost - SBP 53psi RCD pressure 154psi Returns coming up both flow lines through chokes A and B through Coriolis meter returning to header box. 500GPM + 160GPM on the boost - SBP 48psi RCD pressure 110psi 550GPM + 160GPM on the boost - SBP 50psi RCD pressure 116psi 600GPM + 160GPM on the boost - SBP 52psi RCD pressure 127psi 700GPM + 160GPM on the boost - SBP 67psi RCD pressure 130psi Returns coming up both flow lines, one choke and through Coriolis meter and return back to header box. 500GPM + 160GPM on the boost - SBP 74psi RCD pressure 137psi 550GPM + 160GPM on the boost - SBP 84psi RCD pressure 145psi 600GPM + 160GPM on the boost - SBP 92psi RCD pressure 155psi 700GPM + 160GPM on the boost - SBP 110psi RCD pressure 184psi Thanks Ali 7

8 8 ½ X 9 7/8 18,664 w/ 13.2 ppg ppg ECD ppg ESD w/ SBP-- Continue to drill 8 1/2 X 9 7/8 hole w/ 13.2 ppg 600 GPM from ft to ft in MPD mode flow thru AFT & FWD lines thru gutline and bypass choke to Coriolis = 13.9 ppg ECD. Hold 670 psi on connection (+13.9 ppg EMW). GPM PSI RPM WOB TRQ ECD BGD - 40 CG (18,571 ) **Reduced pump rate observing ECD on PWD and increased MW from 13.2 to 13.8 ppg w/ 16.0 ppg pill on bottom for 7 liner run and set 8

9 6 1/8 19,685 w/ 14.1 ppg ppg ECD ppg ESD w/ SBP-- Continue to drill 6 1/8 hole w/ 14.1 ppg 270 GPM from to ft in MPD mode flow thru AFT & FWD lines thru gutline and bypass choke to Coriolis = 14.7 ppg ECD. Hold 685 psi on connection (+14.8 ppg EMW). GPM PSI RPM WOB TRQ ECD BGD - 15 CG - 48 (19,646 ) **Reduced pump rate observing ECD on PWD and increased MW from 14.1 to 14.4 ppg w/ plan to stage to 14.6 ppg for log trip. Mud loss start = spot pill 2 3 bbl hour losses; took 11 MDT sample with ESD of ppg 9

10 MW / ECD / ESD / LOT / SBP 1.5 ESD and ECD in the 6 1/8 section After the good LOT result (14.91 ppg), MW was increased to 13.9 ppg and back pressure maintained at 685 psi; (value close to agreed allowable pressure 750 psi); Hence MW was increased to 14.1 ppg and back pressure reduced to 525 psi. Max ESD ppg (18824 ), max ECD ppg (19485 ). The last ESD (19646 ) is lower than the previous one despite increased SBP. Possibly due to momentary drop of SBP (see figure next page) or downhole cause. Note that in this section ESD has always been higher than the ECD, by choice of avoiding pipe connection gas that may have interfere with potential formation gas from reservoir. ESD was very close from surface leak-off pressure, but no losses have been observed while drilling. 10

11 Fingerprint results minimum backpressure on well DEPTH - CSG/LIN. - MW - GPM Flow line+ Coriolis Flow line Choke + Coirolis 10, psi (cold SBM) 75 psi psi 132 psi 12, / psi psi 15, ¾ psi 150 psi psi 175 psi 17, / psi 154 psi 18, psi 110 psi 11

12 MPD Pressure Control effect on ROP DRILLING RATES WITH / WITHOUT BEARING/SEAL IN MPD WITHOUT BEARING / SEAL IN MPD - MUD DENSITY EQUAL TO PORE PRESSURE FROM TO FOOTAGE HOURS FT / HOUR 15,088 15, ,208 15, ,422 15, ,725 16, ,363 16, ,587 16, ,678' in 35 hours drilling = 47.9' ft/hr May 1600 hours to May 0400 hours = 1,678' in 36 hours = 46.1 ' ft / hr ( Circulate 6 hours to clean up gas ) WITH BEARING/SEAL IN MPD HOLD BACK PRESSURE TO EQUAL PORE PRESSURE 16,766 16, ,945 16, ,990 17, ,034 17, ' in 15 hours drilling = 29.7' ft/hr May 1000 hours to May 0800 hours = 446' in 22 hours = 20.2' ft/hr ( Circulate 11.5 hours to raise mud weight and clean up gas ) 12

13 Kick at 15078ft during drilling 12¼ x13½ phase During drilling 12¼ x13½ hole at 14970ft with 10.5ppg mud, the background gas was showing increase from 90u to 160u. Made a pipe connection at 14989ft and drill ahead to 15030ft. Performed SIT for 5 minutes, drill ahead to 15078ft and performed circulation. After 85minutes of circulation, the ECD and SPP were tend to decrease, followed by the increase in Flow return and 12bbls gain in active pit when the gas increase to maximum 2826 unit. This gas was a connection gas from 14989ft. Gas cut mud 1.0ppg was observed at gas peak. (please refer to plot#1&2). Continued to circulate and decided to increase the MW from 10.5ppg to 10.8ppg by adding barite into the active pit. During circulation, observed a trend of decreasing in ECD and SPP. Performed Flow Check (F/C), trip tank gain 3bbls/3min. Shut in the well and monitor the pressure: SICP=180psi and SIDP=150psi after 15minutes. Pumped 10.80ppg mud to kill the well with Wait & Weight Method. The gas during pumping through choke was high and steady at 2100unit, as per calculation this gas was coming from below the BOP. Concurrently, displacing the riser with 10.8ppg mud, and observed the SIT gas was 2455u, F/C was 3342unit came from the riser; the background gas was steady at 1500unit after 10.8ppg mud around. Shut in the well, SICP=SIDP=0. Open the BOP, and continue circulate with 10.8ppg mud. The maximum bottoms up gas was 2769u with background steady at 700unit. Performed SIT with 10.8ppg mud, and circulate increase MW to 11.0ppg. The SIT gas was 503u, BG 463u, 40unit ABG. The background gas was then decrease to 250unit after 11.0ppg mud around. Spot 1000ft of 15ppg LCM (from 15078ft to 14078ft) and pump out of hole to casing shoe, pump another 40bbls of 12ppg LCM at shoe before pulled out of hole to surface. 13

14 15,078 - Increase flow from 14,989 Pump rate 26 BPM / MW 10.5 ppg / ECD 10.9 ppg Annulus to riser=856 bbls(33 min) Riser annulus = 2418 bbls (93 min) 14,989 PC 2826 units / cut to 10.3 ppg / start 10.8 ppg in / 20 min SI 14

15 Incr MW ppg - kill well thru 4-5 bpm Flush riser CBU incr MW to 11.0ppg - total 22 hours Pump out - spot 1, ppg pill to run 11 ¾ liner 15

16 RCD Bearing/Packer installed drilling 8 ½ X 9 7/8 hole 17,941 w/ 13.2 ppg increased SBP 13 hours Drill to 18,664 w/ 13.2 ppg ppg EMW w/ SBP csg pt. 16

17 Installation / Utilization Cost: Niko-Diamond-Weatherford MPD Diamond Ocean Monarch for Pananda

18 MPD Utilization Cost drilling Pananda # 1 TIME / COST DUE TO MPD UTILIZATION NIKO PANANDA # 1 ( Hourly spread cost = $ 48,000 ) DATE HOURS 22-Apr 20 PU WFD MPD to riser 23-Apr 24 RU Coflex - PRV valve repair -latch 24-Apr 17.5 MU -RCD to diverter - test riser 25-Apr 4 Install bearing/seal in RCD 26-Apr 7.5 Singature / fingerprint flow test 3-May 3 Set seal - fingerprint test on 13 5/8" 10-May 3.5 Set seal - fingerprint test on 11 3/4" 11-May gpm w/ 12.3 ppg 13-May 1 Retrieve RCD bearing/seal for 9 5/8" 17-May 1 Set bearing/seal 18-May 2 Fingerprint for 8 1/2" X 9 7/8" hole 24-May 1 Retrieve RCD bearing/seal for 7" 25-May 2.5 RU/RD Eline adapter to log 29-May 1.5 Change RCD bearing/seal for 6 1/8" 30-May 1 Install bearing/seal in RCD 31-May 4.5 Fingerprint for 6 1/8" w/ 13.6 ppg 4-Jun 2.5 Retrieve RCD bearing/seal 11-Jun 17 Unlock from diverter - RD MPD 12-Jun 3.5 Lay out RCD/DSIT - triple barrel TOTAL HOURS 121 TOTAL COST $ 5, 808,

19 Actual Operations Continuous RCD/Bearing Assembly utilization installed new RCD/Bearing Assembly per hole section Higher bottom hole pressure during connection vs during drilling (ECD), to prevent influx if human error occurred during connection Drilled under pore pressure utilizing MPD for two (2) bottom sections of well Drill to section TD with effective section PP EMW Utilize ECD ( +/- 0.6 ppg ) + MPD SBP on connection with plan to raise MW to PP on final trip to log / run liner Risk of wear on SSBOP annular as per GOM eliminated 19

20 RCD / Bearing Assembly Utilization Model 7875 BTR RCD 5% 33% 62% Number of Hours Nothing was installed = 725 (62%) Number of Hours Bearing Assembly was installed = 385 (33%) Number of Hours Logging Adapter was installed = 66 (5%) Total Hours = 1176 Note: Model 7875 BTR RCD was installed with the riser and remove with the riser. Above timing includes section drilled without MPD but RCD was already installed. 20

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22 Niko Diamond Weatherford MPD Conclusion Drilling to target depth of 19,685 would not have been possible with planned casing program without MPD Drilling with MW less than PP is most efficient use of MPD on higher density wells. Higher SBM on connection than ECD also only allows flow while drilling. Initial installation and cost of $ 7.255MM allowed well to be drilled +/- $ 18MM under AFE and kept complete control during any gas intrusion events Time and cost due to initial use of $ 5.8MM should be down +/- 20% after three (3) wells to $ 4.6MM est. TEAM BUILDING BEFORE WELL = SUCCESS 22