螺线管磁定位技术初探

Discussion on the Solenoid-location System

摘要:

随着钻探工艺的不断发展，对井身轨迹的要求不断增加。一般依靠地磁定位的仪器已无法满足精度要求，于是研发出了多种近场磁导向系统，如MGT、RMRS和慧磁中靶仪等。以发射源种类为依据，可分为主动测量技术和被动测量技术。螺线管磁定位系统属于主动测量技术，它具有数据传输量小、耐温高等优点。目前国外已经商用化，而国内研究不多。本文简单介绍了螺线管测量的理论模型，着重阐述了室内实验和误差分析。实验共测量了144个点数据，总距离平均误差为4.9%，平面距离平均误差为5.6%，初步验证了螺线管磁定位系统的可行性。

关键词:定向钻进;螺线管;定位技术;磁场;导向

Abstract:

Requirements for wellbore trajectory are increasing along with the continuous development of drilling technology. Normal instruments based on geomagnetic positioning has been unable to meet the accuracy requirements, so a variety of near field magnetic guide system, such as MGT, RMRS and SmartMag target instrument, etc. are developed. On the basis of the type of emission source, this system can be divided into active measurement technology and passive measurement technology. Solenoid location system belongs to active measurement technology with the advantages of small data quantity and high temperature-resistance, this technology has been commercialized abroad, but there is no much research on it in China. The paper briefly introduces the theoretical model of solenoid measurement and explains the indoor experiment and error analysis. 144 points data were measured totally with the average total distance error of 4.9% and average plane projected distance error 5.6%; the feasibility of solenoid-location system is validated preliminarily.

Key words:directional drilling; solenoid; location technology; magnetic field; guidance