西南石油大学学报(自然科学版)

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Deformation Calculation and Technical Measure to the Pipe String of
Ultra-deep Open Hole Separate Zone Water Injection in Tahe Oilfield

Wang Shijie1, Yang Zhi2, Zhao Jinzhou2, Wang Lei3, Zhang Jianjun3   

  1. 1. Northwest Petroleum Branch,SINOPEC,Urumqi,Xinjiang 830011,China
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitaion,Southwest Petroleum University,Chengdu,Sichuan 610500,China
    3. Research Institute of Engineering,Northwest Petroleum Branch,SINOPEC,Urumqi,Xinjiang 830011,China
  • Online:2014-02-01 Published:2014-02-01

Abstract:

The particularity of the deep separate flood layer,the formation high temperature and the open hole completion in
Tahe Oilfield’s Ordovician carbonate reservoir,the failure of open hole packer K341 in pre-injection test well cause the injection
test failure. To analyze the reasons for the failure,the paper established the mechanical model of the ultra-deep pipe string of
separate zone water injection and calculated the K341’s creeping quantitative relative to the casing packer with hydraulic anchor
in different working conditions of the injection test pipe string and under the combined action of the mechanical effects. The
results show that the K341 will produce 0.3∼0.6 m creep variable when the Y241 packer is in the process of setting after the
K431 packer is worked and this directly causes the damage of the K341 packer. To solve the problem,we draw up the creep
preventing technical measure of the ultra-deep open hole separate zone water injection pipe string and optimize structure of
injection string. That is installation of bumper sub,optimization structure of packer K341 to keep the working pressure with
packer Y241,installation of centralizers at both end of packer K341 to protect element when down to the wellbore.

Key words: ultra-deep well, open hole, separate zone water injection, creep analysis, technical measure