IJE TRANSACTIONS C: Aspects Vol. 28, No. 3 (March 2015) 483-489   

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Y. Bu, Y. Liu, C. Wan and H. Yuan
( Received: September 24, 2013 – Accepted: August 14, 2014 )

Abstract    With the development of highly-deviated well cementing techniques, rotating casing cementing technology has got more and more attention. The rotating casing technique can improve the displacement efficiency of cement paste, and then enhance the quality of well cementation. In the stuck section, the rotating casing can redress the well to make the casing run sequentially. The casing endures shear stress in rotating, besides axial stress, bending stress, circumferential stress and radial stress are produced by inside and outside casing pressure stress. These forces make it more complicated when calculate the maximum curvature in rotating condition than that without rotation. The paper, by analyzing the casing stresses in rotating condition, assumes a stress model of the casing infinitesimal for rotating casing, puts forward the calculation method for the maximum allowable borehole curvature in casing bucking deformation, or when casing couplings and thread seal fail under rotating condition and determines the biggest borehole curvature that allowed though, laying a base for the design and construction of the highly-deviated well casing.


Keywords    rotating casing, maximum allowable borehole curvature, plastic deformation, casing yield limit, tensile strength, tap sealed


چکیده    با توسعه فناوری های حفاری چاه ، فن آوری حفاری پوششی چرخشی توجه بیشتری را جلب کرده است. روش پوشش چرخشی می تواند به بهبود راندمان جابه جایی خمیر سیمان، و سپس بالا بردن کیفیت حفاری چاه کمک کند. در بخش چسبیدن، پوشش چرخشی می تواند چاه را به اجرای پی در پی پوشش وادار سازد. پوشش، تنش برشی در چرخش، تنش محوری، تنش خم شدن، استرس محیطی و استرس شعاعی را که توسط استرس فشار پوشش داخل و خارج تولید می شود، تحمل می کند. این نیروها آن را پیچیده تر میکند وقتی که حداکثر انحنا را در شرایط چرخش محاسبه می کند نه بدون چرخش. مقاله، با تجزیه و تحلیل تنشهای پوشش در شرایط چرخش، یک مدل استرس از بینهایت پوشش کوچک برای پوشش چرخشی فرض می کند. آن روش محاسبه برای حداکثر حدس مجاز برای انحنا در تغییر شکل پوشش است و یا وقتی که کوپلینگ پوشش و مهر تحت شرایط چرخش شکست می خورد. آن همچنین بزرگترین انحنای که اجازه داده می شود را به عنوان پایه ای برای طراحی و ساخت پوشش چاه تعیین می کند.



1.     Mingxin, B. and Hong, L., "Influence of rotating casing speed on well-cementing quality under the bad hole conditions", Acta Petrolei Sinica,  Vol. 3, (2011), 529-533.

2.     "Drilling manual" written by the First Party. Beijing: Petroleum industry press.(1990)

3.     Li, Q. and Shaobo Feng, "Effect of axial load on casing threads connection stress", Journal of Southwest Petroleum Institute,  Vol. 24, (2002), 81-84.

4.     Zhiyong, H. and Dexin, W., "Method of determining the maximum hole curvature that casing can be run through", Petroleum Drilling Techniques,  Vol. 27, No. 2, (1999), 15-17.

5.     Yingmin Lv, "Mechanics of materials", Dongying: China University of petroleum press, (2007).

6.     Xiangzhen, Y., Weidong, D. and Jinwei, G., "Analysis on mechanics and fatigue reliability of casing string during casing drilling", Acta Petrolei Sinica,  Vol. 30, No. 5, (2009), 769-773.

7.     Ying, S., Weiguo, P., Zhenkun, W. and Zhenxuan, L., "The calculation of maximum allowable borehole curvature for horizontal wells", China Offshore Oil and Gas (Engineering),  Vol. 4, (1993), 47-51.

8.     Youquan, Y. and Ping en, L., "Computation of casing strength under non-uniform load", Acta Petrolei Sinica,  Vol. 28, No. 6, (2007), 138-141.

9.     Deli, Z.Z.G., "Evaluation of casing string fatigue strength under alternating stress amplitude in casing drilling", Petroleum Drilling Techniques,  Vol. 5, (2007), 14-17.

10.   Xili Han, Shi, J. and Kefeng Zhao, "The strength check of heavy casing coupling in deep well", Petroleum Engineering Committee of Chinese Petroleum Society,146-150.

11.   Xu, Y., Guan, Z., Zhang, H., Zhang, H. and Wei, K., "Analysis of the impact of managed pressure drilling technology on current casing program design methods", International Journal of Engineering, Transaction A: Basics,  Vol. 27, No. 4, (2014), 659-666.

12.   Xiangzhen, Y., Jinwei, G. and Xiujuan, Y., "Analysis of api formulas and calculation of casing strength based on reliability theory", Acta Petrolei Sinica,  Vol. 28, No. 1, (2007), 121-126.

13.   Juesuan, L.Y. and Hongliang, J.Z.., "Pipe connection technology of casing drilling under rotary table drilling", Petroleum Drilling Techniques,  Vol. 5, (2008), 241-248.

14.   Jellison, M.J. and Brock, J.N., "The impact of compression forces on casing-string designs and connectors", SPE Drilling & Completion,  Vol. 15, No. 04, (2000), 241-248.

15.   API BUL 5C3, "Bulletin on formulas and calculations for casing, tubing, drill pipe, and line pipe properties, 5th edition, ", (1989).

16.   A. Laderian, "Reduction of temperature profile in oil wells", International Journal of Engineering,  Vol. 13, (2000), 79-89.

17.   Xiu-jiang, F., "Research status and prospect of thread sealing property of the api casing joint at home [j]", Liaoning Chemical Industry,  Vol. 10, (2010), 1105-1107.

18.   Yamamoto, K.-i., Kobayashi, K., Maguchi, T. and Ueno, K., "Stress analysis of premium threaded connection fox by finite element method", Kawasaki Steel Technical Report,  Vol. 5, (1990), 41-47.

19.   Javid, S. and Mohammadi, M., "Boundary shear stress in a trapezoidal channel", International Journal of Engineering-Transactions A: Basics,  Vol. 25, No. 4, (2012), 323-332.

20.   Naderan, K., "Stress concentration factors in spherical vessels with single oblique nozzle", International Journal of Engineering,  Vol. 8, No. 2, (1995), 95-106


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