Numerical simulation method taking dynamic changes of seepage parameter of water-drive reservoir into consideration

Abstract

The invention discloses a numerical simulation method taking dynamic changes of a seepage parameter of a water-drive reservoir into consideration. The numerical simulation method comprises the following steps: S1, establishing a numerical simulation model of the reservoir, and in an iterative computation process, firstly performing computing and solving to obtain a pressure and a saturation data field of each grid block; S2, computing a water-phase flow of each grid block and computing a directional surface flux of each grid block and a total surface flux to obtain data fields of the directional surface fluxes and the total surface flux; S3, establishing a change relationship model of a reservoir permeability along with the directional face fluxes and updating a permeability data field; S4, establishing a change relationship model of a reservoir relative permeability curve along with the total face flux and re-calibrating an endpoint value of the relative permeability curve; and S5, obtaining modified reservoir permeability and relative permeability curves for circular calculation of next time step. The numerical simulation method is capable of providing theoretical support for accurately predicting remaining oil distribution, quantitatively computing movable remaining oil, making an oilfield development plane and directing oilfield digging potential evaluation.

Description

technical field [0001] The invention relates to the application of oil reservoir numerical simulation and the field of oil and gas field development to enhance oil recovery. It quantitatively evaluates the dynamic changes of seepage parameters in water drive oil reservoirs, and forms a new set of numerical simulation methods. Background technique [0002] Under the condition of long-term water flooding, the macroscopic and microscopic structure and fluid composition characteristics of the reservoir are constantly changing, and the key parameters affecting seepage-reservoir permeability, crude oil viscosity, and rock wettability will all undergo great changes. The changes in these physical parameters are undoubtedly It has an important impact on the distribution of remaining oil and the final development effect of the oilfield. Reservoir numerical simulation technology is currently the best method to describe the prediction of remaining oil distribution because it can better ...

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Problems solved by technology

However, in the numerical models of reservoir numerical simulation software developed at home and abroad, it is generally believed that the reservoir parameters of the reservoir do not change during the water injection process. Problems such as continuous representation, non-directional representation, and influence by mesh size

Therefore, it is difficult for this technology to objectively express the time-varying process of reservoir parameters, especially the process of continuous time-varying, and there are large errors in predicting the macroscopic distribution of remaining oil in potential areas. challenge,

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