The pay zone of deep shale gas usually has high strength and strong plasticity due to the large burial depth and the high level of in-situ geostress. Such geological conditions result in not only a low rate of penetration (ROP) and long drilling period for the drilling engineering, but also a low complexity of the fracture network and a small stimulated reservoir volume(SRV) from the fracturing. These greatly limit the economical and effective development of deep shale gas. Concerning the major
engineering technical problems of the effective development of deep shale gas, research focusing on basic theory and methods,essential tools, liquid material system, and key techniques was carried out considering the special geological conditions of shale gas in China. Through this technical research, great technology progress has been achieved, and the engineering technical system for deep shale gas at the depth of 3500~4500 m has initially formed. These technologies were adopted for nearly eighty wells in the Fuling Jiangdong and Pingqiao blocks in the Sichuan basin, Rongwei, Yongchuan, Dingshan and other areas. The drilling time decreased by 30%, and the test production reaches (10~25)×104 m3 per day, which basically realizes the economical and effective development of deep shale gas.