井间定位交变磁场随钻测量方法与实验研究  

Alternating Magnetic MWD Method and Experimental Study on Relative Positioning Between Wells

作　　者：吕官云[1] 孙峰[1] 刘庆龙[1] 

机构地区：[1]中国石化胜利石油管理局钻井工艺研究院,山东东营257017

出　　处：《测井技术》2011年第3期230-233,共4页Well Logging Technology

基　　金：国家高技术研究发展863计划(No.2009AA093501)资助课题

摘　　要：在水平对接连通井、成对水平井等复杂结构井中,精确测量2个井眼之间的相对距离和方位信息对于控制钻头按预定轨迹精确钻进具有重要意义。传统随钻测量方法仅针对单一井眼轨迹进行测量,无法提供精确的井眼间相对距离和方位信息。从钻头与目标井靶点构成的闭环系统角度出发,提出一种用于井间相对定位的近钻头有源交变磁场随钻测量方法。以近钻头永磁体激发的低频交变磁场为信号源,在目标井靶点处进行磁场信号采集与处理,结合常规随钻测量技术,计算出钻头与目标井靶点间的相对方位和距离。实验结果表明,钻头与目标井靶点的距离越小,定位误差越小,定位精度越高;距离越大,对低频交变磁场信号测量系统的高分辨率和高精度需求越高。During drilling complex structure wells, such as horizontal connection wells in CBM development and SAGD pair of parallel wells in heavy oil development, precise measurements of relative distance and directions between wells are quite important for controlling bit along de- signed well trajectory. Traditional MWD method just provides single well trajectory with a cer- tain degree of errors but not the relative distances or directions between wells. Thinking that the closed loop system formed by bit in the first well and target points in the second well, proposed is a near bit rotating magnetic MWD method for relative positioning between wells. The permanent magnet near-bit will excite a low frequency alternating magnetic field, and the magnetic signals can be acquired and processed at the target wells, the relative distances and directions can be fi- nally determined by combining with normal MWD method. The experimental results show that the nearer of the relative distance between bit and target wells, the smaller positioning error, the higher positioning accuracy, and the farther, the higher resolution and accuracy requirement of alternative magnetic measurement system.

关 键 词：随钻测量 交变磁场 复杂结构井 相对定位 旋转磁场 

分 类 号：TE921[石油与天然气工程—石油机械设备]