DU Jinlong, JIN Yan, CHEN Mian, LU Yunhu, LI Kunchao, WANG Shiyong. Impact of the Loading Method on Gas Seal Performance of Set Cement[J]. Petroleum Drilling Techniques, 2018, 46(1): 55-61. DOI: 10.11911/syztjs.2018009
Citation: DU Jinlong, JIN Yan, CHEN Mian, LU Yunhu, LI Kunchao, WANG Shiyong. Impact of the Loading Method on Gas Seal Performance of Set Cement[J]. Petroleum Drilling Techniques, 2018, 46(1): 55-61. DOI: 10.11911/syztjs.2018009

Impact of the Loading Method on Gas Seal Performance of Set Cement

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  • Received Date: July 04, 2017
  • Revised Date: January 10, 2018
  • Gas sealing performance of the cementsheath in natural gas wells is very important.Becausethe cement sheath is subjected to complicated loads during natural gas well production,gas sealing is inevitably affected by such loads and furtherimpacts wellbore integrity.In order to investigate the sealing failure modeof cement sheath under different loading conditions and the influence laws of various factors,the gas sealing performance of set cement under different loading modes was studied on the basis of triaxial cyclic loading tests on set cement while monitoring its permeability and acoustic emission characteristics.Experimental results show that dilatancydamageoccurs,and the permeability of set stone increases rapidly with the appearance of dilatancy point during the loading process.When the peak load is higher than the stress on dilatancy point,the cyclic loading-unloadingprocess will seriously damage theset cement,the permeability rises rapidly,and the risk of gas sealing failure increases significantly.The research demonstrates that the gas sealing performance of cement sheath can be improved by enhancing the set cement damage resistance capability.
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