套管全尺寸剪切变形与损伤检测试验研究  

Experimental Study on Full-Scale Shear Deformation and Damage Detection of Casing

作　　者：孙京 张来斌[1,2] 樊建春 杨紫微[1,2] 张智通 Sun Jing;Zhang Laibin;Fan Jianchun;Yang Ziwei;Zhang Zhitong(College of Safety and Ocean Engineering,China University of Petroleum(Beijing);Key Laboratory of Oil and Gas Production Safety and Emergency Technology,Ministry of Emergency Management)

机构地区：[1]中国石油大学(北京)安全与海洋工程学院,北京市102249 [2]油气生产安全与应急技术应急管理部重点实验室

出　　处：《石油机械》2025年第4期123-131,共9页China Petroleum Machinery

基　　金：中国石油天然气集团有限公司项目“长庆油区水平井套损诊断与风险管控关键技术研究”子课题“套损磁性检测原理与诊断方法研究”(2021DJ6502)。

摘　　要：为研究在剪切载荷作用下套管的变形与损伤行为,通过搭建全尺寸套管剪切加载试验系统,对全尺寸套管进行剪切加载与变形损伤试验,采集其在剪切变形与破坏过程中的加载载荷与变形量,利用自主设计的套管损伤磁记忆内检测装置采集套管试样的表面磁场分布信号,评估套管的损伤状态,并建立了套管剪切变形有限元模型,分析套管试样在剪切加载过程的应力-应变分布与局部塑性变形和壁厚减薄情况。试验结果表明,在剪切载荷加载处套管试样有明显的塑性变形且壁厚减薄并产生穿透型裂纹区域,产生破坏时最大剪切载荷为1264 kN,其变形量为50.7 mm,产生的裂纹最大宽度为0.18 mm;有限元模型结果表明,加载区域套管的塑性变形与壁厚减薄是产生穿透型裂纹的主要原因,试样的塑性区域与变形量的实际加载变形情况一致;通过提取采集的磁记忆检测信号的特征参数并绘制梯度云图,可以直观有效地检测套管的变形与损伤情况。研究结果可为磁记忆检测技术应用于套管损伤检测提供技术支撑。To understand the deformation and damage behaviors of casing under shear load,a full-scale casing shear loading test system was built to conduct shear loading and deformation damage tests on the full-scale casing.The loading load and deformation amount during shear deformation and failure were collected.The surface magnetic field distribution signal of the casing sample was collected using a self-designed casing damage magnetic memory internal detection device to evaluate the damage state of the casing.A finite element model of casing shear deformation was built to analyze the stress-strain distribution,local plastic deformation and wall thickness reduction of the casing sample during shear loading.The experimental results show that the casing sample exhibits obvious plastic deformation and wall thickness reduction at the shear loading point,forming a penetrating crack area.The maximum shear load at the time of failure is 1264 kN,with a deformation of 50.7 mm and a maximum crack width of 0.18 mm.The finite element model results show that the plastic deformation and wall thickness reduction of the casing in the loading area are the main reasons for the occurrence of penetrating cracks,the plastic deformation area and deformation amount of the sample are consistent with the actual loading deformation situation.By means of extracting the characteristic parameters of the collected magnetic memory detection signals and drawing gradient cloud chart,the deformation and damage of the casing can be visually and effectively detected.The study results provide technical support for the application of magnetic memory detection technology in casing damage detection.

关 键 词：全尺寸试验 磁记忆检测 剪切载荷 套管变形与损伤 有限元分析 

分 类 号：TE931[石油与天然气工程—石油机械设备]