基于虚拟仪器的随钻井下管柱多参数测量系统

Virtual Instrument-based Measurement System for Measuring Multi-parameters of Pipe Strings While Drilling

为了了解钻井管柱在井下的真实状态,运用虚拟仪器技术,研究设计了一种井下管柱多参数测量系统。该系统由井上和井下随钻两部分组成,井下随钻部分作为一个接头接在下井管柱上下入井内,可随钻实测井下管柱的三轴加速度、轴向力、扭转力和弯曲力等运动与受力参数。其测量过程可以自动进行,也可由地面通过钻井液压力脉冲进行人为控制。整个系统采用模块化设计,充分体现了虚拟仪器技术的灵活性和实用性。模拟试验和现场试验均证明,该系统能正常启动,采集到的井下管柱受力与运动状况数据准确,且与现场工作状况基本吻合。

To get the real working-state of downhole pipe strings while drilling, a measurement system is developed . The system is designed via virtual instrument technology. The whole system consists of both surface and down hole units. The downhole unit acts as a joint which is screwed onto the pipe strings to be run into the hole. It can measure the axial forces, 3D accelerations, temperature and drilling fluid pressure while drilling. The measuring can proceed automatically, and also can be controlled by operator on the ground surface through drilling fluid via mud pulses. The modularized measuring system performs the flexible and practical characteristics of the virtual instrument. Simulation and field tests indicate that the system can be started steadily and acquire dynamics data about downhole pipes which is in accord with field operating situations.