Effect of tripping velocity profiles on wellbore pressures and dynamic loading of drillstring

• Autorzy: Wang Z. , Miska S. , Yu M. , Takach N.
• Języki publikacji: EN

Abstrakty

EN

Tripping events are expensive and time-consuming. Thus, minimizing tripping time through choosing optimized tripping velocity becomes urgent. Surge or swab pressures in the wellbore and dynamic loading of drillstring will be generated during tripping. Also, dynamic velocity, which is the velocity at the bottom of drillstring, is different from the input velocity at surface. The effect of tripping velocity profile, i.e., tripping velocity changes with time, on the hook load, downhole pressure changes and drillstring dynamic velocity should be fully studied to achieve the optimization. In this study, the effects of tripping velocity profile on loading of drillstring, dynamic velocity and downhole pressure is investigated using numerical simulation. Bergeron's graphical method and Lubinski's approach are utilized to perform the simulations. Components of drillstring, wellbore depth, drillstring length and mud properties are also included in the simulations. Through the current work, a driller's typical way of changing tripping velocity may not be the best one. Selection of tripping velocity profiles should be adapted to depth: higher velocity, triangular/parabolic profiles in shallow wells and lower velocity, trapezoidal profiles in deep wells. Also, based on simulations, the oscillation magnitude of dynamic velocity can be as high as twice that of velocity at surface.

Słowa kluczowe

EN

trapping velocity; optimization

• Wydawca: AGH University of Science and Technology Press
• Czasopismo: AGH Drilling, Oil, Gas
• Rocznik: 2013
• Tom: Vol. 30, no. 1
• Strony: 269--286
• Opis fizyczny: Bibliogr. 13 poz., tab., wykr.

Twórcy

autor

Wang Z.

• University of Tulsa, USA

autor

Miska S.

• University of Tulsa, USA

autor

Yu M.

• University of Tulsa, USA

autor

Takach N.

• University of Tulsa, USA

Bibliografia

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• [2] Bergeron L.: Water Hammer in Hydraulics and Wave Surge in Electricity. John Wiley, Copyright 1961 by ASME.
• [3] Wylie E.B., Streeter V. L.: Fluid Transients. Ann Arbor, Michigan: FEB Press (Corrected Edition 1983).
• [4] Cannon G.E.: Changes in Hydrostatic Pressure Due to Withdrawing Drill pipe from the Hole. API Drilling and Production Practices, 1934, 42-47.
• [5] Goins W.C., Weichhert J.P., Burba J.L., Dawson D.D., Teplitz A.J.: Down-the-hole Pressure Surges and Their Effect on Loss of Circulation. API Drilling and Production Practices, 1951, 125-132.
• [6] Ormsby G.S.: Calculation and Control of Mud Pressures in Drilling and Completion Operations. API Drilling and Production Practices, 1954, 44-55.
• [7] Lal M.: Surge and Swab modeling for dynamic Pressures and safe trip velocities. SPE Paper 11412 presented at the IADC/SPE Drilling Conference, New Orleans, Louisiana 1983 (20-23 February).
• [8] Mitchell R.F.: Dynamic Surge/Swab Pressure Predictions. SPE Drill Engineering, 1988, 325-333.
• [9] Mitchell R.F.: Surge Pressures in Low-Clearance Liners. SPE Paper 87181 presented at the IADC/SPE Drilling Conference, Dallas 2004 (2-4 March).
• [10] Samuel G.R., Sunthankar A., McColpin G., Bern P., Flynn T.: Field Validation of Transient Swab/Surge Response with PWD Data. SPE Paper 67717 presented at the IADC/SPE Drilling Conference, Amsterdam 2001 (Feb.27-March 1).
• [11] Robello G., Sunthankar A., McColping G., Bern P., Flynn T.: Field Validation of Transient Swab-Surge Response with Real-Time Downhole Pressure Data. SPE Drilling & Completion, 2003, 280-293 (December).
• [12] Wagner R.R., Halal A.S., Goodman M.A.: Surge Field Tests Highlight Dynamic Fluid Response. SPE Paper 25771 presented at the IADC/SPE Drilling Conference, Amsterdam 1993 (23-25 February).
• [13] Rubiandini R.S.: New Formula of Surge Pressure for Determining Safe Trip Velocities. SPE Paper 64480 presented at the SPE Asia Pacific Oil and Gas Conference and Exhibition, Brisbane, Australia 2000 (16-18 October)