Development and application of high efficient plugging oil-base drilling fluid system for tight oil horizontal wells
Oil and gas exploration is gradually developing to deep and unconventional oil and gas reservoirs.In the exploration of unconventional oil and gas resources such as Liaohe tight oil,there are many problems,such as the collapse of shale wall in large sections,the difficulty of carrying cuttings in ultra-long horizontal sections,and the great friction.Therefore,oil-based drilling fluid technology with excellent high-temperature resistance,strong inhibition and anti-pollution properties is widely applied.Through technical research,an ef-ficient plugging oil-based drilling fluid system was constructed.The evaluation and application results show that the micro-nano plugging,inhibition,temperature resistance and anti-pollution properties of the system all met the requirements of field construction,and could effectively solve the problems of wellbore instability,col-lapse and cuttings carrying in strata with common micro-fractures.The application in Liaohe key risk explora-tion wells show that the system has good plugging and anti-collapse ability,which plays a vital role in realizing the speed up and scale development of tight oil strata drilling.
tight oileffective pluggingoil-base drilling fluidunconventional tight oil formationhorizon-tal well
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