Study on the Experimental Method of "Plugging / Regulating / Flooding Integration" to Improve Oil Recovery -Taking Bohai Q Oilfield as an Example

In order to realize the high-efficiency development of offshore oilfields, according to the environment of Bohai oil reservoir, this paper uses Bush viscometer, scanning electron microscope and core displacement device to carry out the evaluation of plugging system selection, evaluate the basic performance and oil displacement effect of regulating and flooding system, and compare the differences between water plugging, profile control and flood control separately and "Plugging / regulating / flooding" integration. The research shows that the "inorganic + organic" composite gel system has good injection performance and plugging performance with low initial viscosity and high gel strength. When the water content is greater than or equal to 30% surfactant H1 concentration is greater than 800 mg/L, the stickiness reduction rate of emulsion of thick oil exceeds 80%. Compared with the measures of water plugging, profile control, and flood control respectively, the integrated operation of "Plugging / regulating / flooding" has better effect of increasing oil and reducing water, and the total injection volume is small, the development time is short, the construction cost is low, and the technical and economic index is better.