Method for matching particle size of elastic microspheres used for profile controlling and flooding of oil reservoir deep part with pore throat

Abstract

The invention provides a method for matching the particle size of elastic microspheres used for profile controlling and flooding of an oil reservoir deep part with a pore throat. The method includes the steps that an oil reservoir pore throat diameter distribution parameter is obtained; according to the diameter of the pore throat, a diameter-variable pipe with the diameter same as that of the pore throat, and the breakthrough pressure and deformation migration ability of the elastic microspheres with a certain initial particle size in the diameter-variable pipe under the different-expanded-ratio conditions are measured; through a nuclepore membrane experiment, the filtering time and filtering volume of the elastic microspheres with a certain particle size are obtained after the elastic microspheres pass through nuclepore membranes different in pore diameter; a filtering-time and filtering-volume curve is drawn, and the matching range of the particle size of the microspheres obtained by the deformation migration of the elastic microspheres into one nuclepore membrane with the diameter of the pore throat, the elastic microspheres with corresponding particle size are selected, and profile controlling and flooding of deep part is designed and implemented. According to the method for matching the particle size of the elastic microspheres used for profile controlling and flooding of the oil reservoir deep part with the pore throat, by effectively blocking off the oil reservoir pore throat, the expansion of the water flooding sweep range is achieved, the temperature resistance, salt tolerance and block-off effects are good, the block-off effect of the deformation migration of the elastic microspheres are given play to, and no damage is caused to a reservoir.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a particle size and pore-throat matching method of elastic microspheres used for oil reservoir deep regulation and displacement. Background technique [0002] How to enhance oil recovery during water flooding development of reservoirs is a problem that has attracted much attention in oil production. During the water flooding development process of the reservoir, due to the long-term scouring of the injected water, dominant channels are easily formed, resulting in an invalid circulation of the injected water, affecting the swept volume and displacement effect of the injected water. Adding a plugging agent to the injected water will create effective plugging inside the reservoir, and the injected water will seek new channels, which will cause the injected water flow to change direction and expand the swept volume of water flooding, thereby improving oil recovery and re...

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Problems solved by technology

[0005] The above-mentioned prior art discloses methods for the preparation of polymer microspheres and the evaluation of indoor plugging effects, but the principle of plugging the pore throats of polymer microspheres and the particle size of the microspheres during deep water control and flooding are not clarified. Method of choosing

Various plugging agents for expanding the swept volume of water flooding in existing water injection development reservoirs are generally affected by high temperature, high salinity, reservoir damage, etc., and the plugging effect is not good, the time is not long, and the deep plugging effect of the reservoir cannot be achieved. , so we invented a new method for matching the particle size and pore throat of elastic microspheres used in deep reservoir control and drive, which solved the above technical problems

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