机械式自动垂钻工具偏重机构角位置测量方法研究

Angular position measurement method for the eccentric mechanism of the automatic vertical drilling tool

摘要:

机械式自动垂直钻具在实际应用过程中，偏重机构由于自身的惯性以及外部环境的影响，会出现不能稳定在井眼低边的情况，导致纠斜精度降低。为研究偏重机构在钻进过程中角位置的变化规律，本文提出了基于绝对式磁编码器的一种非接触式的角位置测量方法，构建了测量数据采集界面并进行了实验室验证及可靠性分析。该方法可有效地实现偏重机构变化角度的测量，测量误差不超过3°。非接触式的角位置测量方法能够监测角位移且其误差在工程允许的误差范围内，可以为后续的机械式垂直钻井系统的研发实验和改进优化提供可靠的数据。

关键词:机械式自动垂直钻具;偏重机构;角位置测量;绝对式磁编码器;数据采集

Abstract:

The eccentric mechanism of the mechanical automatic vertical drilling tool can not always be held stable on the low side of the wellbore in the actual drilling conditions due to its own inertia and the influence of the external environment， resulting in the reduction of deviation correction accuracy. In order to study the change law of the angular position of the eccentric mechanism in the drilling process， a non-contact angular position measurement method based on the absolute magnetic encoder is proposed in this paper with the measurement data acquisition interface constructed， and the laboratory verification and reliability analysis carried out. The measurement error is less than 3 degrees， indicating that the non-contact angular position measurement method can monitor the angular displacement and the error is within the allowable error range. It can provide reliable data for the subsequent research and development experiment， and optimization of the mechanical vertical drilling system.

Key words:mechanical automatic vertical drilling tool;eccentric mechanism;angular position measurement;absolute magnetic encoder;data acquisition