›› 2007, Vol. 28 ›› Issue (5): 915-920.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Drilling mud density optimum technique of creep stratum in deep borehole

ZHAO Jin-zhou   

  1. China University of Petroleum-Beijing, Beijing 102249, China
  • Received:2007-01-16 Online:2007-05-10 Published:2013-09-10

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Abstract: Thanks to the creep behavior of salt rock, drilling hole in the salt deposit of deep stratum is a very important and difficult problem in petroleum engineering. The creep of salt deposit often causes oil borehole losing stability, blocking aiguille and demolishing oil well casing, and brings huge economic loss. Based on the measured result of the drilling hole diameter between the different time in Shengke 1 borehole drilling engineering, the creep velocities of the rock layer in the deep stratum are obtained. The exponent creep constitutive law is employed to analyze the creep velocity of rock layer in the three dimension numerical method. The creep parameters of salt rock and soft mudstone are obtained. The creep velocities of rock layer under different drilling mud densities and salt layer depth are also analyzed based on the obtained creep parameters. Considering the permissive stratum creep velocity during drilling, the optimum drilling mud densities under different salt layer depths are obtained. The research result can be used in drilling engineering.

Key words: salt rock, soft mudstone, creep, drilling mud density

CLC Number: 

  • TU 451
  • 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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