Simulation method for evaluating deep migration characteristics of polymer microspheres in porous medium

Abstract

The invention relates to a simulation method for evaluating deep migration characteristics of polymer microspheres in a porous medium. The simulation method comprises: manufacturing a long rock core model; testing resistance coefficients and residual resistance coefficients of the polymer microspheres at different migration depths in the long core model; representing a matching relationship between the polymer microspheres and core pores by adopting a matching coefficient; drawing a relation curve of the injection pressure, the resistance coefficient, the residual resistance coefficient and the displacement depth of the polymer microsphere, finding out the displacement depth at which the injection pressure, the resistance coefficient and the residual resistance coefficient reach the maximum value, and enabling the polymer microsphere to reach the optimal fluidity control and retention capacity at the depth; drawing a relation curve of the particle size and the matching coefficient of the polymer microspheres in the produced liquid and the displacement depth, and determining the particle size range and the matching coefficient range of the polymer microspheres in different migrationperiods. Long-distance migration of the polymer microspheres in a porous medium is simulated, and water plugging and profile control personnel can conveniently select the polymer microspheres of proper types according to the profile control depth.

Description

Technical field: [0001] The invention relates to the polymer microsphere deep control and displacement technology in the technical field of oil field development, and specifically relates to a simulation method for evaluating the deep migration characteristics of the polymer microsphere in porous media. Background technique: [0002] Due to the heterogeneity of underground reservoirs and the difference in viscosity between oil and water in water flooding oilfields, it is easy to cause the injected water to burst or finger along high permeability layers, large pores or fractures. Long-term water injection will further aggravate the heterogeneity of the reservoir, and it is very easy to form a dominant water flow channel in the high permeability zone of the formation, causing most of the injected water to rush along the dominant channel, forming an inefficient and ineffective cycle. There are still a large number of undeveloped reserves or reserves with a low degree of product...

AI Technical Summary

Problems solved by technology

[0006] An object of the present invention is to provide a simulation method for evaluating the deep migration characteristics of polymer microspheres in porous media. This simulation method for evaluating the deep migration characteristics of polymer microspheres in porous media is used to solve the problem of existing artificial core length It is difficult to meet the experimental requirements, and the matching coefficient of polymer microspheres in porous media due to migration and expansion changes with injection time.

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