基于ANSYS的邻井套管磁干扰有限元仿真  

ANSYS-based Finite Element Simulation of Magnetic Disturbance of Casing in Adjacent Well

作　　者：范光第[1] 隋海东 黄根炉[2] 李绪锋[1] 

机构地区：[1]胜利石油管理局钻井工程技术公司 [2]中国石油大学(华东)石油工程学院

出　　处：《石油机械》2013年第8期1-4,共4页China Petroleum Machinery

基　　金：国家科技重大专项"井身结构与井眼轨道优化设计技术研究"(2008ZX05022-001-003)的部分研究成果

摘　　要：邻井套管受到地磁场磁化后产生感应磁场,影响其周围的地磁场,并干扰随钻测斜仪致使磁测量参数失真,对钻井过程中井眼防碰和定向施工造成影响。利用ANSYS软件对套管进行二维与三维有限元电磁仿真,得到了套管周围叠加磁场的分布规律及特性。研究结果表明,竖直套管在地磁场作用下产生的磁化场在一定区域内对地磁场产生了干扰,干扰区具有对称性,并随套管尺寸的变大而增大;在干扰区内不同方向上的磁感应强度变化趋势不一致,沿磁力线方向,磁感应强度由强减弱,而垂直磁力线方向,磁感应强度则由弱增强。The induced magnetic field produced in adjacent well casing due to magnetization of geomagnetic field will affect surrounding geomagnetic fields and disturb measurement-while-drilling （MWD） inclinometer to cause distortion of magnetic measurement parameters. This will affect hole collision prevention and directional con- struction in the process of drilling. The ANSYS software was used to conduct two-dimensional and three-dimensional finite element electromagnetic simulation of casing. The distribution law and property of superposed magnetic fields around casing were obtained. The research findings show that the magnetized field of vertical casing produced under the effect of geomagnetic field disturbs the geomagnetic field within a certain zone. The disturbance zone is symmet- ric, increasing with the size of casing. The variation tendency of magnetic induction intensity in different directions in the disturbance zone is not consistent. The magnetic induction intensity is first strong and then becomes weak a- long the magnetic line of force. But the intensity is first weak and then becomes strong along the vertical magnetic line of force.

关 键 词：邻井 套管 磁感应强度 磁干扰 ANSYS仿真 地磁场 

分 类 号：TE22[石油与天然气工程—油气井工程]