Research and Application of a New Plugging Agent—Oil Soluble Resin

Due to the oil-water layers crisscrossing in the oilfield exploitation, oil production engineers keep on research more and more agent with selective water-plugging/profile modifying in order to reduce water and increase oil. In this paper, researchers use the oil soluble resin as the main raw material, and develop the emulsified oil soluble resin selective plugging agent, and the oil soluble resin is emulsified and dispersed by special processing technology to form a stable oil-in-water emulsion. The emulsion can be mixed with any proportion of water, has good fluidity and easy injection into the layer. After entering the layer, the stability of the system is lost under the action of special demulsifiers, contacting rocks, and the formation temperature, the oil-soluble resin occupy the space to plug by the aggregation and mutual adhesion of the particles to form clusters, or they are attached to the rock surface. By changing the wettability of rock surface and forming mechanical blockage of water flow, the purpose of reducing water production and increasing crude oil production is achieved. The experimental results show that the breakthrough pressure of cores with different permeability can be increased by an average of more than 10 times, and the plugging rate of sandstone cores can reach 93% by using 25% emulsified oil soluble resin selective plugging agent. And the plugging rate of water displacement with 300 times pore volume of core is stable. Because the system is insoluble in oil and water, it has self-selectivity after injection. Through the field application of six times sandstone reservoir and once limestone reservoir, the remarkable effect of increasing oil production and reducing water is obtained, which provides a new technical means for water plugging in reservoir and increasing oil production and reducing water production in single well.