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| A new casing with protective layer and its annular sealing performance |
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GUAN Zhichuan1,2, LI Cheng1,2, ZHAO Xiaofeng3, ZHANG Hao4, WANG Qing5, YAN Yan1,2, SHENG Yanan6, ZHANG Bo7
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(1.School of Petroleum Engineering in China University of Petroleum (East China), Qingdao 266580, China;2.Shandong Ultra-deep Drilling Process Control Tech R & D Center, Qingdao 266580, China;3.Research Institute of Petroleum Engineering, Zhongyuan Oilfield, SINOPEC, Puyang 457001, China;4.Bazhou Branch Company of Xibu Drilling Engineering Company Limited, CNPC, Korla 841000, China;5.CNPC Engineering Technology R & D Company Limited, Beijing 102206, China;6.Drilling Engineering Technology Institute, Zhongyuan Petroleum Engineering Company Limited, SINOPEC, Puyang 457001, China;7.Research Institute of Safety and Environment Protection Technology, CNPC, Beijing 102206, China)
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| Abstract: |
| Aiming at the failure of annulus sealing integrity in high casing pressure wells, a new casing was designed to reduce the crushing failure of cement sheath caused by the alternating high casing pressure, which is named as compression resistance & protection casing (CRP casing). A multi-layers thick wall cylinder model of the wellbore was established to calculate the maximum radial stress and displacement of the inner wall of the cement sheath. Then, an experimental facility was built to verify the engineering feasibility of the CRP casing under actual wellbore pressure and temperature conditions. The calculation results show that, comparing with the conventional casing, the maximum radial stress and displacement of the inner wall of cement sheath in the wellbore using the CRP casing can be decreased by 20.75%-26.66% and 33.3%-76.8%, respectively, which indicates the CRP casing can effectively protect the cement sheath. The experimental results demonstrate that the CRP casing can make the cement sheath bear more casing pressure of 19.4 MPa. |
| Key words: drilling well integrity cementing sealing capacity plane strain |
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