Full three-dimensional simulation method for acidification flow experiment

Abstract

The invention discloses a full three-dimensional simulation method for an acidification flow experiment. According to the method, a differential method is utilized to discrete a fluid seepage continuity equation and an acid-liquid mass diffusion reaction equation, and an H+ local equilibrium equation, a porosity change equation, a permeability change equation and a pore throat radius change equation are established at the same time; initial conditions and boundary conditions are substituted into the simulation equations; a simulation program is compiled by utilizing the equations, the initialconditions and the boundary conditions; 6, reservoir cores are scanned to obtain three-dimensional spatial distribution parameters of porosity; a three-dimensional spatial distribution model of the porosity is established, and the compiled program is utilized to achieve full three-dimensional numerical simulation of the acidification flow experiment on the basis of the established three-dimensional spatial distribution model of the porosity. According to the method, full three-dimensional numerical calculation is adopted, the calculation precision is effectively improved, and meanwhile the influence laws of each parameter on the development of wormholes are conveniently, quickly and accurately studied.

Description

technical field [0001] The invention relates to a full three-dimensional simulation method for acidizing flow experiments, belonging to the technical field of oil and gas field development. Background technique [0002] The key to matrix acidizing of carbonate oil and gas wells is to form effective wormholes that penetrate the damage zone. Successful matrix acidizing can form a negative skin to increase production. Therefore, the research on matrix acidification of carbonate salt oil and gas wells mainly lies in the study of wormholes. The formation process of acid-eroded wormholes in carbonate rocks is: when acid enters the pores in carbonate rocks, it will dissolve. Due to the heterogeneity of reservoir rock pores, The acid tends to flow in the pore-throat network and preferentially enters the larger pores. The acid reacts with the minerals in the pore-throat walls and dissolves the minerals. The pore-throats expand and the acid flows through the pores more easily. As th...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a full three-dimensional simulation method for acidizing flow experiments, to solve the inaccurate problems caused by acid-etched wormholes in the prior art, and to achieve the purpose of truly reproducing the entire process of acidizing flow experiments in three-dimensional space. Moreover, this method can realize repeated research on the influence of various parameters on the growth of wormholes in three-dimensional space without destroying the internal structure of the core.

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