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TECHNICAL PAPERS

Rotary Shouldered Thread Connections: Working Limits Under Combined Static Loading

[+] Author and Article Information
S. Baragetti

Dip. to Meccanica, Politecnico di Milano, P.zza Leonardo da Vinci 32, 20133 Milano, Italy

A. Baryshnikov

ENI-AGIP spa, Via Emilia 1, 20097 S. Donato Milanese (Milano), Italy

J. Mech. Des 123(3), 456-463 (Jun 01, 2000) (8 pages) doi:10.1115/1.1371476 History: Received June 01, 2000
Copyright © 2001 by ASME
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References

API RP7G, 1998, “Recommended Practice for Drill Stem Design and Operating Limits,” 16th edition.
Sopwith,  D. G., 1948, “The Distribution of Load in Screw Threads,” Inst. Mech. Engrs. Appl. Mech. Proc. 159, pp. 373–383.
Baragetti, S., Baryshnikov, A., Guagliano, M., Terranova, A., and Vergani, L., 1999, “Sollecitazioni in giunzioni coniche filettate: risultati numerici e sperimentali,” Convegno Nazionale AIAS ’99, Vicenza, Italy.
Zhao,  H., 1996, “A Numerical Method for Load Distribution in Threaded Connections,” ASME J. Mech. Des., 118, pp. 274–279.
Zhao,  H., 1998, “Stress Concentration Factors within Bolt-Nut Connectors under Elasto-Plastic Deformation,” Int. J. Fatigue, 20, No. 9, pp. 651–659.
Barry, W. R., 1975, “Finite Element Analysis of Casing Threads,” Proc. ASME Petroleum Mech. Engng. Conf., Tulsa, Oklahoma.
O’Hara, P., 1974, “Finite Element Analysis of Threaded Connections,” Proc. Army Symp. Solid Mech., Bass River, Mass.
Baryshnikov, A., Donati, F., Toffolo, G., and Ferrara, P., 1998, “Recommendations Could Improve the Serviceability of Drill-String Components,” World Oil.
Baryshnikov, A., Ferrara, P., Schenato, A., and Curioni, E., 1995, “Make-up Torque and Rotary Shouldered Connection Reliability,” SPE/IADC 29352, IADC/SPE Drilling Conference.
Farr, A. P., 1957, “Torque Requirements For Rotary Shouldered Connections,” Oil Gas J.
API Spec7, 1997, “Specification for Rotary Drill Stem Elements-Specification,” 39th edition.
Baryshnikov, A., Ferrara, P., and Calderoni, A., 1995, “Downhole Tools Fatigue Resistance for Different Materials,” ASME-ETCE Drilling Technology Symposium, Houston, TX.
Maney, J. J., and Strozier, C. A., 1989, “High-Temperature Performance of Rotary-Shouldered Connections,” SPE paper 19554, 64th SPE Annual Technical Conference, San Antonio, Texas.
Sherbuk, N., Gazanchan, J., Semin, V., and Baryshnikov, A., 1987, “Make-up Torque Influence on Shouldered Thread Connection Fatigue Resistance,” Oil Economy Russia, No. 10 (in Russian).
Baragetti, S., and Clerici, P., 1999, “Structural Behavior of Drill Collar Threaded Connections Under Makeup and Axial Static Applied Loads,” Test Report.
PDA Engineering, Patran Division, 1999, “P3/Patran User Manual,” 1 , 2 , 3 , 4 , California.
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Sato,  T., and Besshi,  T., 1998, “Anti-galling Evaluation in Aluminum Sheet Forming,” J. Mater. Process. Technol., 83, pp. 185–191.
Carper,  H. J., Ertas,  A., and Cuvalci,  O., 1995, “Rating Thread Compounds for Galling Resistance,” ASME J. Tribol., 117, pp. 639–645.
Hopkins,  A. N., Harrington,  C. D., and Black,  B. R., 1999, “Reduce Maintenance Costs by Using Engineered Surfaces to Control Friction and Galling,” Wear, 225-229, pp. 27–37.
API RP7A1, 1992, “Recommended Practice for Testing for Thread Compound for Rotary Shouldered Connections,” First edition.
Bailey, E., and Smith, J. E., 1992, “Testing Thread Compound for Rotary-Shouldered Connections,” SPE/IADC 23844, IADC/SPE Drilling Conference.
ISO/TC67/SC4 Standard, First working draft, 1999, “Petroleum and Natural Gas Industries—Material, Equipment and Offshore Structures—Threading, Gauging and Testing of Rotary Shouldered Thread Connections.”
Weatherford, Int’L., 1994, “Lube-Guard High Temperature-High Pressure Tool Joint Compound,” Product Information, Oil Center Research Inc., USA.

Figures

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New NC50 165×83 connection under applied make-up and tensile (static and dynamic) loads
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Dimensioned sketches both of the NC50 pin and box thread connections
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Axisymmetric finite element mesh of the NC50 thread connection
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Sketch of the modification of the NC50 box shoulder and position of the strain gages (“A”=axial strain gages, “C”=circumferential strain gages)
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Comparison between experimental and numerical results (make-up torque equal to 24 kNm).
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(a) Shoulder separation condition: a) make-up torque 5.13 kNm and tension 669 kN, b) make-up torque 30.36 kNm and tension 3674 kN. (b) Pin yielding condition: a) make-up torque 34.02 kNm and tension 3237 kN; b) make-up torque 45.31 kNm and tension 0 kN. RFL in shoulder separation and pin yielding conditions under combined loading.
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Trend of the percentage of load carried by the first-engaged thread for increasing values of make-up torque in a) pin yielding conditions and b) shoulder separation conditions
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Sketch of the equipment for tension and compression during make-up procedure
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Shoulder separation: comparison between the API diagram, FEA and the results obtained by applying make-up torques equal to Mup=9450 Nm and Mup=4700 Nm

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