旋转导向工具稳斜钻进井眼轨迹控制方法设计

Design of well trajectory control method for Rotary Steering Drilling System in steady inclined section

提出了一种旋转导向工具在稳斜钻进作业时井眼轨迹控制方法。稳斜钻进作业中需要控制井斜和方位两个参数。控制方法由井下闭环和井上闭环两部分组成。井下闭环利用井下近钻头设备实时测量的井斜角信息,并通过液压控制系统闭环控制井斜,保证井眼轨迹在井斜方向按照井眼轨迹设计方向前进。井上闭环利用随钻测量设备向地面提供的井斜角、方位角信息,经过地面软件处理得到实钻轨迹并同设计轨迹进行比较,得出方位调整策略,通过数据下传技术下传到井下旋转导向工具,旋转导向工具依据方位调整策略进行扭方位操作,以保证实际轨迹和设计轨迹的重合。控制方法中根据导向能力需求不同,将导向力分成多个档次,以适应不同钻井条件下对全角变化率的要求。试验验证了控制方法的有效性。

A well trajectory rotary control method in steady inclined section during rotary steering drilling is proposed,which is divided into two parts,one is the underground closed loop,and the other is whole well closed loop. Using the information of the real time well deviation angle got from the instrument close to the drilling bit,the underground closed-loop can control the well deviation angle by means of the hydraulic control system to ensure well trajectory drilling in the designed direction. Compared the designed trajectory with the data got from the ground software processing the information of well deviation angle and azimuth angle provided by WMD,the whole well closed loop can get the azimuth adjustment value,which would be sent to downhole rotary steering drilling system to adjust the drilling direction and to ensure the designed trajectory consistent with the actual trajectory. Hydraulic force is divided into several grades in order to adapt to the different needs. The test results verify the feasibility of the control technology.