Key technology for drilling CBM parameter wells in Taigemiao mining area of Xinjie

In order to strengthen the protection of coal resources in Taigemiao mining area of Xiejin and realize the green exploration, a total of 6 coalbed methane parameter wells were deployed and drilled. Due to the coal quality of the coal-bearing strata, the development of fractures and joints, the low permeability, and the strong adsorption capacity, problems such as fluid leakage, stucking, borehole collapse, hole deviation exceeding the standard, and drill bit blocking are often encountered. During the drilling, reasonable drilling structure and drilling tool combination, preferred drilling fluid performance and drilling parameters are adopted, and the mature rope core drilling technology is adopted to ensure the coring effect; after completion, the injection pressure drop test technology was used to obtain the grid. The gas and reservoir data of the target coal seam in the area were assessed to evaluate the production capacity of the coalbed methane. The results show that the harvest rate of the parameters was 93%-98%, the mechanical drilling rate was 1.63-2.55 m/h, the well inclination was 2.69°-3.22°, the formation pressure coefficient was 0.93, the coal seam permeability was 1.16×10^-3μm², and the better drilling was obtained. And the test results provide reference for CBM drilling construction and testing in similar areas in the future.