Optimal and fast drilling technology for shale oil in Fuxing area
Jurassic lacustrine and fluvial sand mudstone reservoirs are developed in Fuxing area of eastern Sichuan Province.The types of oil and gas are condensate oil and shale gas,and the continental shale oil and gas horizontal Wells in this area have some difficulties,such as large hole,long well section,difficult deviation,narrow formation pressure safety window,poor drilling ability of horizontal section,difficult traj-ectory control,and easy collapse of horizontal section.This article integrates and optimizes technology through wellbore structure,drilling method,acceleration tools,trajectory control,drilling fluid type,com-pletion method,etc.The results show that through key technologies such as secondary wellbore structure,enhanced parameter drilling,PDC drill bit+pre bending drilling tool combination,strong plugging oil-based drilling fluid,rotary directional drilling,and non pressurized leak prevention cementing,complex sit-uations such as wellbore instability,poor drillability in the horizontal section,and frequent leakage and overflow conversion have been overcome,drilling efficiency has been improved,drilling cycle has been saved,and a set of optimal and fast drilling technologies suitable for shale blocks in the Fuxing area has been formed,providing a good reference for subsequent horizontal well exploration and development in the area.
Fuxing areacontinental shale gas wellhorizontal welloptimal and fast drillingtrajectory control
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