轴向约束非均匀载荷下蒸汽热采井套管屈曲研究  

Buckling of Casing under Axial Constraint and Non-uniform Load in Steam Thermal Well

作　　者：王航 杨尚谕 赵金兰 韩礼红 田志华[3] 谢斌[3] 张学鲁[3] WANG Hang;YANG Shangyu;ZHAO Jinlan;HAN Lihong;TIAN Zhihua;XIE Bin;ZHANG Xuelu(CNPC Tubular Goods Research Institute,Xi＇an,Shaanxi 710077,China;State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials,Xi＇an,Shaanxi 710077,China;PetroChina Xinjiang Oilfiled Company,Karamay,Xinjiang 834000,China)

机构地区：[1]中国石油集团石油管工程技术研究院,陕西西安710077 [2]石油管材及装备材料服役行为与结构安全国家重点实验室,陕西西安710077 [3]中国石油天然气股份有限公司新疆油田分公司,新疆克拉玛依834000

出　　处：《石油管材与仪器》2018年第4期18-22,共5页Petroleum Tubular Goods & Instruments

基　　金：国家自然科学基金项目"长时服役热采井套管材料性能预测方法"(编号:51574278)

摘　　要：针对蒸汽热采井套管屈曲失稳,从材料、套管服役特征角度,采用室内试验和数值模拟,研究了轴向约束非均匀载荷下套管屈曲机理。四十臂井径仪、水泥胶结/密度仪测井结果表明:3轮次注-采作业后,固井质量合格的套管柱结构完整,固井质量不合格的套管柱局部屈曲变形。室内试验表明:注-采作业过程套管材料表现出应变强化、应力松弛及低周疲劳,服役套管处于热弹-塑性应力状态。基于能量原理的有限元数值模拟结果证实,套管-水泥环第一界面横向位移是套管屈曲变形的主要原因。The mechanism of casing buckling was studied in view of service behavior for both material and casing using laboratory test and numerical simulation, which aimed at structural instability due to casing buckling for steam thermal well. Based on multi-finger image tool （MIT） and eight sector cement bond/density （RCB/ RCD） device, structural integrity was observed for thermal casing string when cement sheath qualified. Otherwise the buckling occurred. Laboratory test results indicated that service behavior of material characterized with strain strengthening, stress relaxation and low cycle fatigue, and then casing became thermal elastic-plastic stage. Finite element numerical simulation based on energy principle showed that the casing buckling can be attributed to lateral displacement in the first interface between casing and cement sheath.

关 键 词：蒸汽吞吐 热采井 水泥环 非均匀载荷 屈曲 

分 类 号：TE931[石油与天然气工程—石油机械设备]