The peripheral blocks in Sichuan Basin contain a large area of marine shale gas with low abundance and normal pressure, according to the current development costs, the reserves are difficult to be used, and it is urgent to carry out the low-cost technical breakthrough of drilling engineering to revitalize the shale gas resources. The research on low-cost drilling technology has been carried out in drilling, logging and cementing in Wulong area of southeast Chongqing. Based on the analysis on the causes of high drilling cost, the technical research and field practice are carried out mainly in the optimization of well bore structure, well trajectory control and drilling tools, leakage protection & control as well as the optimization of logging and cementing, etc. The test well Longye 2HF is composed of guide hole and sidetrack horizontal well, the drilling cost decreased by 30% compared with the adjacent well, which lays a foundation for the development of normal pressure shale gas in Wulong area.