光纤陀螺油井测斜仪研究与设计

Research and Design of Fiber Optic Gyroscopes Inclinometer for Well Logging

提出了基于光纤陀螺的油井测斜仪及将光纤陀螺捷联惯性测量技术应用到石油测井领域的方法,以解决目前油田所用测斜仪器易受磁干扰的问题。介绍了光纤陀螺原理以及光纤陀螺油井测斜仪的总体设计,在其原理样机中,采用高速数据处理芯片TMS320VC33DSP实现数字滤波和实时解算,以实现井眼轨迹的方位角、倾斜角和工具面角的测量。在此基础上,提出了系统误差补偿方案、初始对准方案和仪器结构方案。测试结果表明,该样机达到了设计指标要求(方位准确度优于±2°;倾斜准确度优于±0.2°),可满足石油测井工业应用要求。

A new inclinometer based on Fiber Optic Gyroscopes （FOGs） is presented to eliminate magnetic interference existing in currently used inclinometer of well logging. The principle and the schematic design of the Fiber Optic Gyroscopes Inclinometer （FOGI） system are introduced. In its prototype, the TMS320VC33DSP industrial module is used for digital filter and real time calculation of the azimuth angle, inclination angle and the tool face azimuth angle. On this foundation, the error compensation method, the initial alignment scheme and the mechanical configuration are developed. The test result shows that the performance of the prototype meets the pre-set requirements （azimuth angle accuracy better than ±0.2°, inclination angle accuracy better than ±0.2° ）.