“慧磁”定向钻井中靶系统超高精度中靶技术研究

Study on ultra-high precision target-hitting technology of SmartMag system

摘要:

随着“慧磁”定向钻井中靶系统应用范围的不断扩大，对中靶精度的要求也随之不断提高。在现有仪器设备的基础上，如何进一步提高其导向测量的精度，实现超高精度中靶，是在现场对接井施工中亟待解决的问题。本文对 “慧磁”测量精度的影响因素进行了分析研究，阐述了工具面向角、测点的磁环境、探管的振动和探管的居中度等因素对测量结果的影响，并提出了相应的解决方案。在此基础上开展了地面水平井对接中靶试验，结果表明，通过采取上述措施，能有效提高“慧磁”系统测量精度，实现超高精度中靶。论文的研究成果对于在小溶腔水平对接井施工轨迹控制能力及一次中靶成功率具有一定的指导意义。

关键词:定向钻井;水平对接井;测量误差;中靶精度;超高精度;“慧磁”定向钻井中靶系统

Abstract:

With the extensive application of the SmartMag system in various fields, the requirement on the precision of target-hitting is getting higher. How to enhance the measurement precision of SmartMag to realize ultra-high precision target-hitting is a problem that must be solved during horizontal well intersection. In the paper, analysis of the factors that may affect the measurement precision is conducted, including the tool face of the mud motor, magnetic environment of the measurement, vibration of the probe, and position of the probe in the borehole; and the solutions are provided accordingly. Then, a series of field tests were conducted at surface for horizontal well intersection, and the results showed that the measurement precision of SmartMag is significantly improved and ultra-high precision target-hitting is realized. The test results in the paper can be used as reference for improvement of the trajectory control for horizontal well intersection and the one-time success rate of target-hitting where the target cavity size is limited or undeveloped.

Key words:directional drilling; horizontal well intersection; error of measurement; target-hitting precision; ultra-high precision; target-hitting technology of SmartMag system