Application of geo-steering technology for horizontal well of shale gas development in Weiyuan-204 well block in Sichuan

At the bottom of Longmaxi formation of Weiyuan in Sichuan,a set of shale has been developed and it is rich in hydrocarbon gases.At present,the area has become a hot spot for domestic shale gas exploration and development.In order to improve the drilling rate of good shale reservoir and shale gas production,the geological tracking technology of 4 horizontal wells have been implemented in Weiyuan-204 block.According to the size of the GR values with drilling and the trajectory adjustment of the longitudinal location,the bit can be guaranteed to drill to the designed geological horizon.The drilling rate of good shale reservoir can be up to 95.11%,and it can avoid the waste of the horizontal well drilling footage and save drilling cost.The preliminary daily gas production per single well can be up to 22.6×104 m3,and then the prospected effect can be achieved.