Optimized and fast drilling technology for unconventional gas reservoirs in block K in Tarim Basin

In the block K of the Tarim Basin, shale gas evaluation parameters such as shale sedimentary environment, organic matter abundance, maturity, continuous producing layer thickness, and brittle mineral content are favorable, hence show a good potential for exploration. Through the studies of mature blocks for shale gas explorations, effective drilling techniques for unconventional gas reservoirs in the study area were discussed. 5¹/₂″ casing pipes were recommended for perforation and completion. Due to the wide distribution and big thickness of shale gas reservoirs, borehole trajectory control was not strictly restricted. The conventional MWD+ drilling resis-tance instruments worked well in the borehole trajectory control of horizontal wells.