OILFIELD SERVICES. JFE STEEL CORPORATION

Transcription

1 TM

2 FOX is an advanced premium threaded connection which has been jointly developed by JFE STEEL CORPORATION and HUNTING OILFIELD SERVICES. JFE STEEL CORPORATION has over seventy years experience in steel production, and provides proprietary JFE-series OCTG for sour service, low temperature service and hi-collapse service, in addition to API grades. HUNTING OILFIELD SERVICES has over twenty-five years experience in the design, manufacture and technical field service of connections for OCTG. Together, we have designed a connection which uses innovative design concepts to overcome problems found in conventional premium connections. Advanced thread geometry, a unique seal design and innovative gauging tech-niques combine to reduce thread galling and enhance sealing performance. FOX TM TM has been field-proven around the world. CONTENTS INTRODUCTION FOX TM CONNECTION DESIGN FEATURES... 2 THE FOX TM PITCH CHANGE CONCEPT SUPERIOR LOAD DISTRIBUTION FEA MODELS...3 THE TRIPLE RADIUS SEAL CONCEPT...4 GAUGING TECHNIQUES... 7 AVAILABLE SIZES... Legal Notice This catalog is edited for general information only. Although every possible effort is made to maintain the accuracy and reliability of the contents of this publication, JFE Steel Corporation in no way assumes liability or responsibility for any loss, damage or injury resulting from the use of the information and data contained here It is requested that all applications for the material described are to be undertaken solely at the customer's own risk and responsibility. COVER: Graphic shows distribution of equivalent plastic strain around seal when made up with finite element analysis.

3 . FOX TM CONNECTION: DESIGN FEATURES PIPE WALL BUTTRESS TYPE THREAD WITH PITCH CHANGE reduces peak tooth load and improves load distribution COUPLING CONTOURED METAL-TO-METAL SEAL reduces stress concentration and ensures excellent sealability INTERNAL FLUSH DESIGN (Tubing) enhances flow efficiency and corrosion resistance PIPE WALL DESIGN FEATURE EFFECT IMPROVEMENT THREAD PITCH CHANGE METAL-TO-METAL TRIPLE RADIUS SEAL INTERNAL FLUSH. Reduction of maximum tooth load 2. More even tooth load distribution. Localized high sealing pressure 2. Reduced stress concentration. Reduction of turbulence a. High resistance to thread galling b. Good control of make-up c. High resistance to back off d. High resistance to coupling belling and unzipping e. increased fatigue life a. Ensure excellent sealability b. Reduce shoulder damage c. High resistance to over-torquing d. High resistance to seal galling a. Enhanced resistance to corrosion b. High flow efficiency

4 2. THE FOX TM PITCH CHANGE CONCEPT A B C A The gap between load flanks closes B The standard pitch area acts to C The gap between load flanks on as the joint is made up to torque condition. concentrate loads in the center section of the thread. initial assembly closes as the joint is axially loaded in tension. DOUBLE PITCH CHANGE The pin member retains a standard pitch over its entire length. The box member features three section, each having a different pitch: increased pitch (in relation to the pin) in the outer part of the box, standard pitch in the center section, and reduced pitch in the inner section. This produces gaps at the load-bearing flanks of the threads in the inner and outer regions of the thread prior to make-up and running. Pitch 2 Pitch Pitch 3 (Smaller than Pitch ) (Larger than Pitch ) Pitch Pipe The gaps between the load-bearing flanks of the threads are closed by make-up torque and by the axial load imposed by pipe weight. Threads are preferentially loaded in the center of the connection, with reduced loads in the inner and outer sections. The risk of thread galling is reduced by the lower level of radial thread interference in the FOX TM connection in comparison to other designs. 2

5 3. SUPERIOR LOAD DISTRIBUTION TYPICAL PREMIUM CONNECTION Make-up only Make-up plus axial tension 2 / O.D. L8 data 2 / O.D. L8 data Load on each thread (lbs),, 4, 3, 2,, Load on each thread (lbs),, 4, 3, 2,, Thread tooth number Thread tooth number FOX TM PREMIUM CONNECTION Make-up only Make-up plus axial tension 2 / O.D. L8 data 2 / O.D. L8 data Load on each thread (lbs),, 4, 3, 2,, Load on each thread (lbs),, 4, 3, 2,, Thread tooth number Thread tooth number 4. F.E.A. MODELS Two FEA graphics show the difference in axial stress distribution with and without pitch change. The pitch change concept, which is one of the main features of the FOX TM design, works to give more even load distribution on each thread. (with Pitch Change) (without Pitch Change) 3

6 . THE TRIPLE RADIUS SEAL CONCEPT The triple radius seal used in the 'FOX TM ' connection comprises a pin seal feature having a profile of three interacting radii engaging with a corresponding sealing surface profile in the coupling. Because of the generous blending radius which this design allows, there is a reduced local stress concentration giving better resistance to over torquing and fatigue. Primary radius metal-to-metal seal Reduced local stress concentrations Enhanced overtorque resistance Pipe Torque shoulder Internally flush to eliminate turbulence (tubing only) The smooth, continuous profile of the FOX TM triple-radius seal improves sealing performance, reduces stress concentrations and provides for increased overtorque resistance. A more gradual lead-in during make-up is achieved compared with the conventional double taper design, and the principle of tri-axial compression is included. Sealing is achieved as a result of combined radial and axial compression of the pin end. The smooth interior pin to coupling profile produces internally flush bores for tubing applications, maximizing bore diameter and reducing turbulence. COMPARISON OF SEAL STORED ENERGY 4 FOX TM Connection Pipe 4 Typical Premium Connection Cumulative strain energy (axial) Cumulative strain energy (axial) Pipe 2 2 Plots of strain energy induced in the pin and coupling for both a conventional and the FOX TM connections were obtained from the finite element analysis. These confirm the prediction that the strain energy stored across the metal-to-metal seal for the FOX TM is significantly greater than for a conventional connection. 4

7 . GAUGING TECHNIQUES Electronic Gauging As part of the FOX TM development program, the FOX TM development team addressed problems of conventional thread gauging, and devised a new electronic gauging technique. The gauge measures stand-off, taper, seal diameter and lead of pin and box thread at a resolution of one micron. The measurements are analysed by a data processsing unit, which is able to mathematically compensate for pipe ovality on the basis of measurement data. The electronic gauging process reduces the wear problem associated with hard gauging, and enables an individual data record to be retained for every FOX TM connection. Data Processing Unit Pin Taper Seal Gauge Mechanical Gauging Conventional taper, lead and thread height gauges may also be used in gauging of FOX TM connections, in such forms as go/no-go gauges. MRP Gauge Thread Form Gauge Go/No-Go Gauge to inspect thread form. To measure thread diameter.

8 7. AVAILABLE SIZES /8 2 7/8 3 /2 4 4 /2 /2 D t d LL mm mm mm % Nominal Wall lb/ft Weight Thickness Nominal Inside Drift (API) Length Make up Length Loss mm Tensile Efficiency TPI API Regular mm % Tensile Efficiency Special Clearance % Efficiency

9 The Make up loss for FOX TM is shown in the size table. LL /8 7 7 /8 8 /8 9 /8 D t d LL mm mm mm % Nominal Wall lb/ft Weight Thickness Nominal Inside Drift (API) Length Make up Length Loss mm Tensile Efficiency TPI API Regular mm % Tensile Efficiency Special Clearance % Efficiency

10 Cat.No.EE-3- TOKYO HEAD OFFICE NEW YORK OFFICE HOUSTON OFFICE BRISBANE OFFICE RIO DE JANEIRO OFFICE LONDON OFFICE DUBAI OFFICE NEW DELHI OFFICE MUMBAI OFFICE SINGAPORE OFFICE BANGKOK OFFICE VIETNAM OFFICE JAKARTA OFFICE MANILA OFFICE SEOUL OFFICE BEIJING OFFICE SHANGHAI OFFICE GUANGZHOU OFFICE Hibiya Kokusai Building, 2-3 Uchisaiwaicho 2-chome, Chiyodaku, Tokyo -, Japan Phone : (8) Fax : (8) JFE Steel America, Inc. Third Avenue, 2th Floor, New York, NY, U.S.A. Phone : () Fax : () JFE Steel America, Inc., Houston Office 777 Westheimer, Suite 23, Houston, TX 7742, U.S.A. Phone : () Fax : () JFE Steel Australia Resources Pty Ltd. Level 9, CPA Centre, 37 Queen St, Brisbane, QLD 4, Australia Phone : () Fax : () JFE Steel do Brasil LTDA / JFE Steel Corporation, Rio de Janeiro Office Praia de Botafogo, 228 Setor B, Salas 8 & 9, Botafogo, CEP 222-4, Rio de Janeiro-RJ, Brazil Phone : () Fax : () JFE Steel Europe Limited th Floor, The Broadgate Tower, 2 Primrose Street, London EC2A 2EW, U.K. Phone : (44) Fax : (44) JFE Steel Corporation, Dubai Office P.O.Box 279 LOB9-28, Jebel Ali Free Zone Dubai, U.A.E. Phone : (97) Fax : (97) JFE Steel India Private Limited, th Floor, Unitech s Signature Tower, Tower-A, South City-I, NH-8, Gurgaon, Haryana, 222, India Phone : (9) Fax : (9) JFE Steel India Private Limited Mumbai Office 38, A Wing, 2 Atrium, Andheri - Kurla Road, Andheri (East), Mumbai - 493, Maharashtra, India Phone : (9) Fax : (9) JFE Steel Asia Pte. Ltd. Raffles Quay, No. -3, Hong Leong Building, 488, Singapore Phone : ()22-74 Fax : () JFE Steel (Thailand) Ltd. 22nd Floor, Abdulrahim Place 99, Rama IV Road, Bangkok, Thailand Phone : ()2-3-8 Fax : ()2-3-9 JFE Steel Vietnam Co., Ltd. Unit 4, 4th Floor, Kumho Asiana Plaza, 39 Le Duan Street, Dist, HCMC, Vietnam Phone : (84) Fax : (84) JFE Steel Corporation, Jakarta Office th Floor Summitmas II, JL Jendral Sudirman Kav. -2, Jakarta 29, Indonesia Phone : (2) Fax : (2) JFE Steel Corporation, Manila Office 23rd Floor 788 Ayala Avenue, Oledan Square, Makati City, Metro Manila, Philippines Phone : (3) Fax : (3) JFE Steel Korea Corporation th Floor. Geumgang-Tower , Daechi-dong, Gangnam-gu, Seoul, 3-7, Korea Phone : (82) Fax : (82) JFE Steel Corporation Beijing 9 Beijing Fortune Building No., Dongsanhuan North Road, Chaoyang District, Beijing, 4, P.R.China Phone : (8)-9-9 Fax : (8)-9-9 JFE Consulting (Shanghai) Co., Ltd. Room 8, Building A, Far East International Plaza, 39 Xianxia Road, Shanghai 2, P.R.China Phone : (8) Fax : (8) JFE Consulting (Guangzhou) Co., Ltd./ JFE Steel Corporation, Guangzhou Office Room 39, Citic Plaza, 233 Tian He North Road, Guangzhou 3, P.R.China Phone : (8) Fax : (8) Notice While every effort has been made to ensure the accuracy of the information contained within this publication, the use of the information is at the reader s risk and no warranty is implied or expressed by JFE Steel Corporation with respect to the use of information contained here The information in this publication is subject to change or modification without notice. Please contact the JFE Steel office for the latest information. Copyright JFE Steel Corporation. All Rights Reserved. Any reproduction, modification, translation, distribution, transmission, uploading of the contents of the document, in whole or in part, is strictly prohibited. 42R(3)-. UM Printed in Japan