The Suizhong 36-1 oilfield and Luda 5-2 oilfield in Bohai Sea are ultra-high porosity and ultra-high permeability reservoir,and the formation pressure system is complex after secondary adjustment and development,and a variety of complex formations need to be drilled during the drilling process,and there are uncertain factors such as formation pressure,formation state,lithology and formation stratification depth,which restricts the drilling timeliness.In order to speed up the process of exploration and development,the drilling fluid speed-up agent was researched and developed to reduce the adsorption of drilling cuttings on drilling tools,change the wettability of the rock surface,and improve the lubrication performance of drilling fluid,so as to increase the drilling speed.The speed-up agent was applied in well A6,A9,A12,A18 and A22 in Bohai oilfield,and the average reversed reaming off rate of the five wells was reduced by 21.6% compared with the original.
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