Analysis of Trajectory Control Technology in Horizontal Section of Nanchuan Shale Gas
In the early stage of shale gas development in Nanchuan block,Chongqing,rotary guide and near-bit technology were used in the horizontal section.However,with the increase of block development,in order to further reduce cost and improve efficiency,single-bend screw drilling tool +LWD combination was gradually promoted for construction.However,due to the zero-length and screw of the LWD instrument,the gamma curve data lags behind,and the adjustment track section is long,resulting in frequent penetration and layer pursuit,which is easy to cause downhole complexity and make the drilling rate of the target layer low.Therefore,this paper summarizes and analyzes the corresponding relationship between the four parameters of the target layer and layer level changes from four aspects,including target layer lithology,drilling parameter analysis,tool and formation gradient trend,and gamma curve,so as to achieve the purpose of improving the accuracy of horizon judgment and reducing errors caused by zero-length blind area of instruments.It has certain reference significance for improving drilling rate of shale gas horizontal section in Nanchuan block.
NETL
NSTL
万方数据
维普
