The long horizontal section horizontal well technology for coalbed methane is an important means of efficient development in deep low-permeability coal reservoirs.However,due to factors such as the length of the horizontal section and the large water-to-vertical ratio,there are technical difficulties in controlling wellbore trajectory,sliding drilling support pressure,rock debris bed removal,and completion pipe string insertion during drilling and completion,as well as the risk of leakage.To address these is-sues,the CNPC Bohai Drilling Engineering Company Limited has conducted research on the optimization design of wellbore trajectory,control of drilling trajectory,matching of wellbore extension auxiliary tools and completion technology,and has formed the drilling and completion technology for long horizontal sec-tions of coalbed methane.It has been successfully applied in two wells,including ZP4-76-32L in the Qinshui Basin of Shanxi,creating a record for the longest horizontal section of a single 2001m coalbed methane branch and a maximum water-to-vertical ratio of 3.67 in China.
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