China Petroleum network news as of November 13th, Daqing oilfield 80-P026 wells group application of new low initial viscosity control agent has been more than two years, the cumulative increase of 10 thousand and 100 tons of oil.
Chemical plugging technology is chemical injection high suction blocking layer, adjust the stratigraphic section, expand swept volume and liquid injection to solve the problem of low utilization ratio, is to improve the reservoir producing degree and main measures of oilfield development effect. However, the gel plugging agent has the gelling time is short, after being injected into formation pressure rising quickly, only plugging the near wellbore cannot realize the technical bottleneck of deep reservoir plugging point.
A new formulation of low initial viscosity gel plugging agent has been determined by scientific research personnel of Daqing oil production engineering research institute. The new formula of initial viscosity less than 10 MPa, and before the gel plugging agent commonly used lower than 80%, which can realize the deep reservoir in different positions of fixed block, plugging rate was 99%. At the same time, it does not pollute the medium and low permeability layers, and meets the technical requirements of "plugging, regulating and driving" after polymer flooding.
As of now, a research group conducted a total of 4 wells were 21 injection wells, 4 recovery after polymer flooding field test wells plugging, plugging after low permeability reservoir water ratio increased by more than 38%. Among them, the water cut of the well group connected with the well 80-P026 in the pilot test has decreased by 1.6 percentage points, and the maximum water cut of the single well is 37 percentage points.
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