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《Natural Gas Industry》 2016-01
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Casing failure laws under uniaxial compressive load

Lin Yuanhua;Deng Kuanhai;Zeng Dezhi;Sun Yongxing;Li Kewei;Zhao Liping;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation//Southwest Petroleum University;Key Laboratory for Tubular Goods Engineering//Southwest Petroleum University;Drilling & Production Engineering Technology Research Institute of CNPC Chuanqing Drilling Engineering Co.,Ltd.;School of Geoscience and Technology,Southwest Petroleum University;CNPC Drilling Research Institute;  
Many studies have been performed on casing collapse failure under uniform load,and API 5C3 and ISO standards have been established.The non-uniform load also has obvious influence on casing collapse strength.There are only few investigations and experiments on casing collapse failure under non-uniform load.In this paper,non-uniform collapse experiments were conducted on P110 SS casing with or without cement sheath under uniaxial compressive load by using YAW electrohydraulic servo pressure testing machine.The displacement variations of P110 SS casings under uniaxial compressive load were obtained.No cracks occur on the casing in the whole loading process,which indicates that the P110 SS casing will not burst and cause downhole accidents during its deformation.The local yield load,local instability load,deformation rule and failure mechanism of P110 SS casings with or without cement sheath under uniaxial compressive were obtained by measuring the strain in the process of testing by means of the resistance strain gauge pasted on the outer wall of the casing.Analysis was made on the effect of uniaxial compressive load on the local yield load and local instability load.It is concluded that the initial yield of casing during loading does not mean the load-carrying capacity is lost or drops,on the contrary,its load-carrying capacity may rise greatly.
【Fund】: 国家自然科学基金“H_2S/CO_2溶解度测试预、测及其与油套管完整性的相关性研究”(编号:51274170)
【CateGory Index】: TE931.2
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