一种带保护层的套管及其环空密封性  

A new casing with protective layer and its annular sealing performance

作　　者：管志川[1,2] 李成 赵效锋[3] 张颢 王庆 闫炎 胜亚楠 张波 GUAN Zhichuan;LI Cheng;ZHAO Xiaofeng;ZHANG Hao;WANG Qing;YAN Yan;SHENG Yanan;ZHANG Bo(School of Petroleum Engineering in China University of Petroleum (East China), Qingdao 266580, China;Shandong Ultra-deep Drilling Process Control Tech R & D Center, Qingdao 266580, China;Research Institute of Petroleum Engineering, Zhongyuan Oilfield, SINOPEC, Puyang 457001, China;Bazhou Branch Company of Xibu Drilling Engineering Company Limited, CNPC, Korla 841000, China;CNPC Engineering Technology R & D Company Limited, Beijing 102206, China;Drilling Engineering Technology Institute, Zhongyuan Petroleum Engineering Company Limited, SINOPEC, Puyang 457001, China;Research Institute of Safety and Environment Protection Technology, CNPC, Beijing 102206, China)

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580 [2]山东省深地钻井过程控制工程技术研究中心,山东青岛266580 [3]中国石化中原油田分公司石油工程技术研究院,河南濮阳457001 [4]中国石油集团西部钻探工程有限公司巴州分公司,新疆库尔勒841000 [5]中国石油集团工程技术研究院有限公司,北京102206 [6]中国石化中原石油工程公司钻井技术研究院,河南濮阳457001 [7]中国石油安全环保技术研究院,北京102206

出　　处：《中国石油大学学报（自然科学版）》2021年第3期75-81,共7页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家重点研发计划(2017YFC0804500);中国石油大学(华东)研究生创新工程项目(YCX2019014);教育部"海洋油气井钻完井理论与工程"创新团队项目(IRT1086);国家自然科学基金项目(51674284)。

摘　　要：针对高套管压力井出现的环空密封失效问题,设计一种能够减轻高套管交变内压力对水泥环的挤压破坏的套管,并将其命名为抗压及保护型套管(compression resistance&protection casing,CRP套管)。建立井筒的多层厚壁圆筒模型,分析水泥环内壁的最大径向应力和位移;建立试验设备验证设计的工程可行性,并通过控制温压模拟实际井筒工况。计算结果表明相较于常规套管,CRP套管水泥环内壁的最大径向应力和位移的降低幅度分别为20.75%~26.66%和33.3%~76.8%,理论上可以保护水泥环密封完整性;试验中CRP套管能够使水泥环多承受19.4 MPa的套管压力,证明了该套管良好的工程可行性。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.

关 键 词：钻井 井筒完整性 水泥环密封能力 平面应变 

分 类 号：TE21[石油与天然气工程—油气井工程]