捷联式旋转导向井斜方位动态解算方法

针对捷联式垂直钻井现场试验,对测量系统井下存储数据进行回放分析,提出捷联式旋转导向井斜方位动态解算方法,即在钻柱不旋转的情况下同时采用三轴实时滤波信号计算井斜方位并存储滤波后的x、y轴信号,在钻柱旋转的情况下采用滤波后的实时z轴信号,不旋转情况下采用存储的x、y轴信号进行计算。将井下钻具的黏滑状态也看作是一种不旋转的"静止"状态,提出利用井下测量数据实时判断钻柱旋转状态的方法,给出井斜方位角解算公式以及动态解算方法流程,并在Matlab软件中编制程序进行仿真验证。结果表明:钻柱旋转过程中的振动是引起井斜方位测量误差的主要原因;所提出的动态测量算法能够有效提高测量精度,减少钻柱振动对井斜方位解算结果的影响。

Dynamic solution approach to inclination and azimuth of strap-down rotary steerable system

According to strap-down vertical drilling field test,the playback analysis on underground storage of the measurement system was curried out.A dynamic resolution approach to inclination and azimuth of strap-down rotary steerable system was proposed,that is,with non rotating string,filtered real time signals on three-axis was all used for calculation,at the same time,filtered signals on x-axis,y-axis were stored.On the condition of rotation string,real time filtered signals on z-axis and stored signals of x-axis,y-axis with non-rotating string were adopted.In addition,stick-slip state of the downhole drilling tools was seen as a non-rotating "stationary" state.Real-time judgement method of string rotation state based on downhole survey data was proposed,and solution equation and dynamic solution process of deviation azimuth were given.And simulation in Matlab was done.The results show that the drill string vibration caused by rotation is the main reason for measurement error of deviation azimuth.The recommended dynamic survey approach could effectively enhance measurement precision,and deduce the effect of vibration on resolving results.