A Characterization Method for Improving Effective Mode of Water Flooding by Nano-micron Particle Dispersion System

Abstract

The invention provides a characterization method for improving the effective mode of water flooding by a nano-micron particle dispersion system, which belongs to the technical field of petroleum exploitation. This method first studies the two-phase seepage characteristics of nano-micron particle dispersion system; then, according to the two-phase seepage characteristics under different permeability core conditions, the displacement process is divided into two effective modes, and the least square method is used to solve the relational expression Based on the coefficient in , an empirical formula that can quantify and characterize the two effective modes is obtained; finally, according to the indoor experiment of nano-micron particle dispersion system to enhance oil recovery, the experimental results of the influence of nano-micron particle dispersion system concentration and injection slug size on oil recovery are obtained. Quantitatively characterize it, and obtain the empirical formula for improving oil recovery in the water flooding stage of nano-micron particle dispersion system. The prediction model can be applied to the long-term planning and annual planning of improving water flooding by the nano-micron particle dispersion system, and can also be used to evaluate the effect of the development and adjustment measures of the nano-micron particle dispersion system to improve water flooding.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a characterization method for improving the effective mode of water flooding by a dispersion system of nanoparticles and micrometers. Background technique [0002] Nanoparticle dispersion system to improve water flooding technology is a new and potential deep water flooding technology that has developed rapidly in recent years. Aiming at the low-permeability reservoir rock throat diameter is micron level, it is prepared by polymerizing nano-micron particle monomers, cross-linking agents, initiators and active agents through the synthesis method of nano-micron materials, and prepares a material matching the throat diameter. Nanoparticle dispersion system. Its control and displacement mechanism is that after the nano-micro particle dispersion system enters the oil layer with the injected water, it can move freely in the porous medium, accumulate at the throat to gen...

AI Technical Summary

Problems solved by technology

However, in view of the two-phase seepage characteristics of the nano-micron particle dispersion system, there is no characterization method for characterizing the nano-micron particle dispersion system to improve the effective mode of water flooding and an empirical formula for predicting the degree of enhanced oil recovery.

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