悬挂器坐挂引起的套管二维屈曲失效形式研究  

Two-dimensional failure model analysis of casing caused by liner hanger

作　　者：韩峰[1,2] 崔晓杰[1,2] 薛占峰[1,2] 邓同军 

机构地区：[1]中国石化石油工程技术研究院,北京100101 [2]页岩油气富集机理与有效开发国家重点实验室,北京100101 [3]中国石化天然气川气东送管道分公司,武汉430074

出　　处：《中国科技论文》2016年第23期2696-2699,2710,共5页China Sciencepaper

基　　金：国家科技重大专项资助项目(2016ZX05038-005)

摘　　要：针对尾管固井时尾管载荷过大导致悬挂器坐挂失败的现场问题,提出了坐挂套管局部应力计算方法。该方法基于板壳理论,建立了悬挂器卡瓦与套管的力学模型,分析了套管的屈曲失效模式,得到了塑性铰发生的位置。通过有限元分析软件ABAQUS,研究了卡瓦与套管坐挂时的应力状态,得到了套管在卡瓦挤压下的等效塑性应变。14-3/8″套管坐挂分析结果表明:在弹性范围内,套管局部最大应力的解析值和有限元数值解的误差为15.6%;当卡瓦载荷达到40MPa时,套管的最大应力已经超过弹性极限;当卡瓦载荷达到55 MPa时,套管的塑性区域已经连通,套管将会以塑性铰的形式失效。A prediction method of casing stress was introduced to solve the problem that liner hanger performed failure during meriting. Based on shell mechanics, a force model of slips and casing was established, casing buckling failure was analyzed, and position of plastic hinge was obtained. Stress distribution of casing was discussed using ABAQUS, and equivalent plastic strain was obtained. The research on interaction of 14-3/8＂casing and liner hanger was done, and results showed that the maximum stress of casing was beyond elastic limit when the slips load was up to 40 MPa. While the slip load was up to S5 MPa, the plastic region of casing was connected, and plastic hinge led to casing failure. Slips load is in the limits of safety obtained by the casing stress prediction method, which can avoid cementing accident.

关 键 词：悬挂器 套管失效 力学模型 应力分析 塑性铰 

分 类 号：TE925.2[石油与天然气工程—石油机械设备]