用可控偏心器实现井眼轨迹的闭环控制

REALIZING HOLE TRAJECTORY CLOSED-LOOP CONTROL BY CONTROLLABLE DECENTRALIZER

目前的钻井基本上处于地面开环控制状态 ,它的频繁起下钻使钻井效率降低、成本提高 ,甚至难以实现设计的井眼轨迹。随着钻井的位移和井深不断增加 ,能够解决上述问题的井眼轨迹闭环控制已成为钻井行业的前沿课题。可控偏心器是结合了微电子、信息、液压、控制等技术开发的一种智能导向工具。通过它构成的井眼轨迹闭环控制系统能够实现井眼轨迹的自动控制 ,从而提高井眼轨迹控制精度 ,降低钻井成本。为此 ,文章根据可控偏心器的导向机理 ,提出了带可控偏心器的井眼轨迹闭环控制系统及控制策略 ;探讨了可控偏心器翼片缸压合矢量的闭环控制方法 ,通过仿真实验验证了其可行性 ,对可控偏心器的现场应用具有重要的指导意义。

At present,drilling is in a surface open-loop control condition on the whole and its frequent tripping operations make the drilling efficiency be reduced,the drilling cost be raised and even the designed well trajectory be difficult to be realized.Along with the unceasing increase in both displacement distance and well depth,the closed-loop control which can solve the question mentioned above has become a forward problem in drilling industry.The controllable decentralizer is an intelligent steering tool developed in combination with these techniques as microelectron,information,hydraulic pressure and control,etc.The hole trajectory automatic control can be realized through the closed-loop control system formed with the decentralizer,thus raising the accuracy of controlling hole trajectory and reducing the drilling cost.For this reason,according to the steering mechanism of the controllable decentralizer,the hole trajectory closed-loop control system with the controllable decentralizer and its control tactics are put forward and the closed-loop control method of wing panel cylinder pressure composite vector of the controllable decentralizer is discussed in the paper.The feasibility of this method was examined by simulation experiment,which is of important guiding significance for the controllable decentralizer's being applied on the spot.