›› 2005, Vol. 26 ›› Issue (6): 855-858.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Laboratory study of casing strength under nonuniform load

DENG Jin-gen1, TIAN Hong1, WANG Zhi-zhong1, ZHOU Jian-liang2   

  1. 1.Faculty of Oil and Gas Well Engineering, University of Petroleum, Beijing 102249, China；2.Research Center of CNOOC，Beijing 100027, China
  • Received:2005-03-08 Online:2005-06-10 Published:2013-12-17

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Abstract: Most of the casing failure in salt bed are due to the nonuniform additional collapse load caused by salt creep. But there are still no any comprehensive strength design methods for casing under nonuniform load. Based on the full-scale casing strength test under nonuniform load, this paper analyzes the strength characteristics of the casing under nonuniform load and suggests that the equivalent failure load and the ratio of minor axis and major axis can be used to quantitatively describe the nonuniform load. The casing strength design charts presented by this paper can be used to check the safety of the casing in salt bed or help perform casing strength design when the load is known. The experiment results demonstrated that the strength of the casing under nonuniform load is 8 to 21 times lower than that under uniform load.

Key words: oil-well casing, nonuniform load, strength characteristics, strength test

CLC Number: 

  • TE 92
  • Please send e-mail to pingzhou3@126.com if you would like to read full paper in English for free. Parts of our published papers have English translations.
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