A Design Method for Pore-Throat Scale Elastic Microsphere Control and Flooding Based on Particle Size Matching Relationship

Abstract

The invention discloses a method for designing profile controlling and flooding for pore-throat-scale elastic microspheres on the basis of particle size matching relations. The method includes introducing particle size matching coefficients to represent the particle size matching relations among the pore-throat-scale elastic microspheres and pore throats of rock cores; determining that an optimal particle size matching relation range is 1.35-1.55 by plugging performance experiments for the pore-throat-scale elastic microspheres in different particle size matching relations; determining a reasonable injection concentration range of the pore-throat-scale elastic microspheres by selective plugging experiments for rock cores of heterogenous parallel sand-filled pipes and recovery efficiency improving experiments under a heterogenous condition; and determining particle sizes of the pore-throat-scale elastic microspheres required by field tests according to the average diameter of the pore throats of core rocks of a profile controlling and flooding target stratum in an oil field and the temperature and the mineralization degree of the target stratum. The method has the advantages that an in-depth profile controlling and flooding principle of the pore-throat-scale elastic microspheres is sufficiently considered, the scientificity and the practicality of a scheme for formulating profile controlling and flooding for the pore-throat-scale elastic microspheres are improved, a good profile controlling and flooding effect can be realized, and the yield of the oil field can be increased.

Description

【Technical field】 [0001] The invention relates to the technical field of oilfield water injection development, in particular to a design method for controlling and flooding of pore-throat scale elastic microspheres based on particle size matching relationship. 【Background technique】 [0002] In the process of oilfield water injection development, due to the horizontal and vertical heterogeneity of the reservoir, the difference of oil-water viscosity and the imbalance of injection-production well pattern, there are problems that the water injection well advances toward the production well tongue and along the high-permeability layer, resulting in the injection water low-efficiency circulation, while the low-permeability zone in the reservoir and the low-permeability zone in the same layer have not been swept, and there is still a large amount of remaining oil. Therefore, increasing the swept volume of injected water is an important method to enhance oil recovery. Among them,...

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Problems solved by technology

[0012] In order to solve the problem that the existing profile control design method is not suitable for the new pore-throat scale elastic microsphere profile control technology, the present invention discloses a pore-throat scale elastic microsphere control and displacement design method based on the particle size matching relationship

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