Drilling Completion Techniques Used in Shale Gas Horizontal Well YSH1-1 in Zhaotong Block

To speed up the exploration for drilling techniques of shale gas horizontal well in Zhaotong block,this paper takes Well YSH1-1 as an example to introduce those successful technical measures and construction experiences in bit optimization,drilling fluid leak protection and bridging,exceptional cementation process and high density OBM to crack down technical difficulties such as formation abrasiveness and strong impact,frequent vicious mud loss,serious borehole collapse and cement quality.The success in pilot drilling in Well YSH1-1 suggests that those adopted technical measures are practicable,which can be promoted in this block.In addition,the paper also proposes further research focus in shale gas well drilling in Zhaotong Block.It would provide a guideline in technical improvement in shale gas well drilling in China.