Application of multi-branch horizontal well technology in CBM drilling is of high technical contents, with great construction difficulties. This paper, by presenting drilling practices of BHDC (Bohai Drilling Engineering Company Limited, a CNPC company) at 10 wells including ZP02-1H and ZHP4H, makes discussion and analysis on technologies of wellbore path control, well connection, geo-steering, open-hole sidetracking, aerating, etc.

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