A Simulation Method for Evaluating the Deep Migration Characteristics of Polymer Microspheres in Porous Media

Abstract

The invention relates to a simulation method for evaluating the deep migration characteristics of polymer microspheres in porous media, which includes: making a long core model; testing the resistance coefficient and residual resistance of polymer microspheres at different migration depths in the long core model coefficient; use the matching coefficient to characterize the matching relationship between polymer microspheres and core pores; draw the relationship curve between polymer microsphere injection pressure, resistance coefficient and residual resistance coefficient and displacement depth, and find the maximum injection pressure, resistance coefficient and residual resistance coefficient value of the displacement depth, at which the polymer microspheres can achieve the best fluidity control and retention capacity; draw the relationship curve between the particle size and matching coefficient of the polymer microspheres in the production fluid and the displacement depth, and determine the polymer microspheres at Particle size range and matching coefficient range in different migration periods. The invention simulates the long-distance migration of polymer microspheres in porous media, and facilitates water plugging and profile control personnel to select a suitable type of polymer microspheres according to the depth of profile control.

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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