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Multi-scale acid rock reaction flow simulation method

A technology for acid-rock reaction and flow simulation, applied in CAD numerical modeling, design optimization/simulation, etc., can solve problems in the field of numerical simulation of useless acid-rock reaction, improve near-well pollution, ensure calculation accuracy, and improve calculation The effect of efficiency

Pending Publication Date: 2022-07-29
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

In recent years, the multi-scale method has also been extended to the field of fluid-solid interaction research, but it has not been applied to the field of numerical simulation of acid-rock reaction.

Method used

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  • Multi-scale acid rock reaction flow simulation method
  • Multi-scale acid rock reaction flow simulation method
  • Multi-scale acid rock reaction flow simulation method

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Embodiment

[0067] like figure 1 As shown, the method for multi-scale acid-rock reaction flow simulation includes the following steps:

[0068] S1. According to the geometric shape, scale and other information of the area, a geometric model is established. Then, through the parameter information of porous medium, including permeability, porosity and other information, the geometric model is given physical properties to form a complete physical model, and a mathematical model of acid-rock reaction flow is established according to the acid-rock reaction flow mechanism: Darcy scale model;

[0069] The Darcy scale model includes the Darcy flow equation and the convection-diffusion equation. Darcy's flow equation is:

[0070] Velocity and pressure relationship model:

[0071] Velocity and porosity relationship model:

[0072] Convective-diffusion equation describing acid concentration:

[0073]

[0074] k c (C f -C s )=R(C s );

[0075]

[0076] where v is velocity, K is pe...

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Abstract

The invention relates to the field of numerical simulation of acidification of carbonate reservoirs, in particular to a multi-scale acid rock reaction flow simulation method. The method comprises the following steps: establishing a physical model of acid rock reaction flow simulation and an acid rock reaction flow mathematical model; performing multi-scale mesh generation on the research area, constructing a multi-scale calculation format, and solving a Darcy flow equation in the mathematical model on a coarse mesh to obtain a pressure solution and a velocity solution on a fine scale; porous medium parameters required by numerical simulation are calculated through the pore scale model; and integrating the pressure, the speed value and the porous medium parameters, solving on the fine grid to obtain a convection diffusion equation in an acid rock reaction flow mathematical model, and obtaining a final acid liquor concentration numerical result. According to the method, the characteristics and advantages of different numerical value methods are combined, the calculation efficiency is improved while the calculation precision is guaranteed, a new thought is provided for acid rock reaction flow simulation, and suggestions are provided for implementing oil field reservoir transformation, improving near-well pollution and the like.

Description

technical field [0001] The invention relates to the field of numerical simulation of acidification of carbonate rock oil reservoirs, in particular to a method for multi-scale acid-rock reaction flow simulation. Background technique [0002] Carbonate reservoirs in my country are widely distributed and rich in reserves. Acidizing and artificial fracturing are common stimulation measures for such reservoirs. Artificial fracturing technology has been widely used in major oil fields and achieved good results. However, in carbonate rock reservoirs, fractures are relatively developed, and the filtration of fracturing fluid may occur during artificial fracturing. adversely affect surrounding reservoirs. Acidification can better improve the formation flow. Since the composition of carbonate rock is easy to react with acid, and the reactant does not contain precipitation, acidification can effectively improve formation conditions, such as the problem of near-well pollution areas, i...

Claims

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Application Information

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IPC IPC(8): G06F30/23G06F30/28G06F111/10
CPCG06F30/23G06F30/28G06F2111/10
Inventor 张传宝张庆福高安邦郭建福王汝磊李风鸣黄成江张世明唐磊吕广忠
Owner CHINA PETROLEUM & CHEM CORP
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