Key technology of pipe sticking in CBM directional well in Block Baode

during the drilling in Wells Bao1X2 and Bao1-1X1 Block Baode in Shanxi, adhesive drill pipe sticking occurred at the same formation while drilling No. 8+9 coal beds. Aiming at the common problem happened in the construction of directional wells in this Block, geological logging and logging curve as well as drilling data obtained from some already constructed directional wells were used to analyze the cause of pipe sticking. The prevention measures to pipe sticking were presented from three aspects: drilling tools assmbly, drilling fluid performance and drilling process. The measures were applied into filed with good result, which prevent the adhesive pipe sticking happening during the directional wells drilling in Block Baode and ensure the smooth implementation drilling operation in CBM reservoir. Meanwhile, these measures can also be used for reference in constructing directional wells in other blocks coal bed methane reservoirs.