Abstract




 
   

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

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  THE RESEARCH ON THE BIGGEST BOREHOLE CURVATURE THAT ALLOWED THROUGH FOR THE ROTATING CASING (RESEARCH NOTE)
 
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.

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