Volume 33 Issue 6
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LI Jin, GONG Ning, LI Zaoyuan, HAN Yaotu, YUAN Weiwei. Progress in Studying Cement Sheath Failure in Perforated Wells[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(6): 10-16. doi: 10.3969/j.issn.1001-5620.2016.06.002
Citation: LI Jin, GONG Ning, LI Zaoyuan, HAN Yaotu, YUAN Weiwei. Progress in Studying Cement Sheath Failure in Perforated Wells[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(6): 10-16. doi: 10.3969/j.issn.1001-5620.2016.06.002
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Progress in Studying Cement Sheath Failure in Perforated Wells

doi: 10.3969/j.issn.1001-5620.2016.06.002

  • 1. Bohai Research Institute of Petroleum, Tianjin Branch of CNOOC, Tianjin 300452;

  • 2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500

  • Received Date: 2016-09-12
  • Publish Date: 2016-11-30
    Abstract
  • Perforation well completion is a widely used completion method, and is of great importance to oil and gas well stimulation. With more and more wells completed with perforation, more attentions have been paid to the sealing integrity of cement sheaths after perforation, especially the perforation of wells with thin pay zones. Research work presently done has been focused on the effects of perforation on casing strings, while little attention has been paid to the damage of cement sheath. Oil and gas well perforation has characteristics such as being powerful, short time, high temperature, and being highly destructive. It is pointed out in this paper, based on analysis, that the diffculties in studying the failure of cement sheath mainly lie in laboratory simulation, determination of the degree of damage to the cement sheath, determination of the cement sheath's resistance to impact under practical conditions, and ascertaining the effects of perforation parameters on the integrity of cement sheath, etc. Researches presently done on the topics such as perforation simulation methods used both in China and abroad, integrity of cement sheath after perforation, shock or impact resistance of cement sheath, and the effects of perforation parameters, are summarized in this paper. Defciencies of the researches are also discussed herein. Also included in this paper are technical measures concerning self-healing cement, cement slurry and set cement performance designs, optimization of perforation parameters, and prediction of dynamic damage to downhole cement sheath etc.

     

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