Simulation method for deblocking process of heavy oil reservoir based on digital core model

Abstract

The invention discloses a simulation method for a deblocking process of a heavy oil reservoir based on a digital core model, which is based on an original digital core model containing a plurality ofrock mineral components and a reservoir damage digital core model, combines indoor experimental results (the transformation and volume change law of different types of rock minerals) of the deblockingeffect of a chemical blocking remover to rock minerals and asphaltenes under different simulated conditions, and tightly combines the indoor research result and the digital core model based on the method such as model discrete point stability discrimination and corrosion algorithm in morphology, thereby achieving the simulation of the reservoir deblocking process based on the digital core technology; finally, the deblocking mechanism of the chemical blocking remover to reservoir damage under different simulation conditions is obtained through analysis of the digital core model microstructureand hole penetration change before and after deblocking of the chemical deblocking medicament; and the proposition of the method further expands the application of the digital core technology to oil and gas field development and also provides a new means for the study of the reservoir deblocking process.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development, in particular to a method for simulating the plugging removal process of heavy oil reservoirs based on a digital core model; the reservoir plugging removal process based on a digital core model is mainly aimed at reservoirs with less original data simulation. Background technique [0002] During the steam injection production process of heavy oil reservoirs, the change of reservoir rock and fluid properties will cause damage to the reservoir, which will lead to the increase of steam injection pressure and affect the normal steam injection operation; on the one hand, different clay minerals will Under the conditions of temperature, pressure, etc., expansion, transformation, etc. will cause reservoir damage. On the other hand, heavy components such as colloids and asphaltenes with strong polarity in heavy oil reservoirs will be adsorbed with changes in temperature and pressure...

AI Technical Summary

Problems solved by technology

Clay minerals are an important part of reservoir rock minerals. In addition to their strong plasticity when exposed to water, most of them also have strong adsorption and ion exchange properties; they are the main controlling factors that cause sensitive damage to reservoirs. , while in the process of thermal recovery of heavy oil, with the change of temperature, pressure and crude oil components, the polar macromolecular compounds in crude oil continue to accumulate and suspend in the pores of the reservoir, and at the same time, they are adsorbed in the reservoir under the action of force. The surface of rock minerals, thus exacerbating the damage of the reservoir, chemical plugging measures can effectively improve the porosity and permeability of the reservoir after damage to the reservoir; however, due to the high sampling cost of conventional laboratory research methods, the simulation process has poor repeatability and contrast to the reservoir. Injury research poses difficulties

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