Volume 36 Issue 2
Apr.  2019
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DUAN Zhifeng, MENG Huajun, LAI Xuan'ang, ZHANG Yanna, HUANG Zhanying. Integrity Analysis of Cement Sheath in Tight Gas Reservoir Formations in Changqing[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(2): 234-239. doi: 10.3969/j.issn.1001-5620.2019.02.018
Citation: DUAN Zhifeng, MENG Huajun, LAI Xuan'ang, ZHANG Yanna, HUANG Zhanying. Integrity Analysis of Cement Sheath in Tight Gas Reservoir Formations in Changqing[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(2): 234-239. doi: 10.3969/j.issn.1001-5620.2019.02.018
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Integrity Analysis of Cement Sheath in Tight Gas Reservoir Formations in Changqing

doi: 10.3969/j.issn.1001-5620.2019.02.018

  • 1. State Project Laboratory of Low permeation Oil and Gas Exploration and Development, Xi'an 710018;

  • 2. Research Institute of Oil and Gas Technics, Changqing Oilfield Company, Xi'an 710018

  • Received Date: 2018-10-21
  • Publish Date: 2019-04-30
    Abstract
  • The tight gas reservoirs in Changqing Oilfield have high fracturing pressures, imposing high requirements on the mechanical property of cement sheath. The integrity of cement sheath of a typical hole interval (φ152.4 mm hole size×φ114.3 mm casing size) of a well was analyzed using the established casing-cement sheath-formation combination model and the method for evaluating the sealing performance of a combination (sealing safety factor method). The analyses, taking account of the data gathered from field operations, showed that:① when the elastic modulus of a cement sheath was decreased, forces acting on the cement sheath was reduced, resulting in increased safety factor; ②when fracturing pressure was increased, the safety factor was reduced; ③ when the rate of volumetric contraction of cement was increased, the safety factor of the cement sheath was reduced remarkably. Based on the results calculated using the data gathered from the well, the mechanical property of cement sheath having good sealing performance in horizontal section of a well was presented. This study will provide theoretical support for analyzing the integrity of cement sheath in the tight gas reservoirs in Changqing Oilfield or other similar reservoirs.

     

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