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Method for analyzing and simulating fluid flow of fracture-cavity oil reservoir

A fluid flow and fracture-cavity technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of undeveloped and open general mathematical models

Active Publication Date: 2014-01-15
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

Theoretical research on dynamics of fractured-cavity reservoirs, including general mathematical models and numerical simulation methods, has not yet been developed and published

Method used

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  • Method for analyzing and simulating fluid flow of fracture-cavity oil reservoir
  • Method for analyzing and simulating fluid flow of fracture-cavity oil reservoir
  • Method for analyzing and simulating fluid flow of fracture-cavity oil reservoir

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Experimental program
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Embodiment Construction

[0146] (1) Establish a coupled mathematical model of Navier-Stokes equation and Darcy equation in complex media

[0147] For fractured-cavity carbonate reservoirs, the fluid has two flow forms: the flow of fluid in bedrock, dissolved pores and micro-fractures is characterized by seepage; the flow of fluid in large fractures and caves is characterized by free flow. The former uses Darcy's law to express its motion equation, and the latter uses Navier-Stokes (referred to as N-S) equation to express its motion equation. Combining the law of conservation of mass, law of conservation of momentum and equation of state to establish a mathematical model. The coupling conditions between the interfaces are established according to the balance conditions of normal velocity continuity and normal direction force at the interface, and then the coupling model at the interface is determined according to the coupling conditions at the interface.

[0148] A, two-phase flow equation of incompre...

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Abstract

The invention provides a method for simulating the fluid flow of a fracture-cavity oil reservoir, belonging to the field of numerical simulation of the oil reservoir. The method provides a numerical simulation method of an oil reservoir based on the coupling of a Navier-Stokes equation and a Darcy equation and mainly comprises the following steps of: (1) establishing a complex medium Navier-Stokes and Darcy coupling mathematical model; (2) using a numerical computing method of the Navier-Stokes and Darcy coupling model; and (3) respectively modeling a rock mass and fractures, wherein the respective modeling is easy, the description for the fractures is clear and easy, the quantity and the space of the fractures are not limited, and particularly, nodes on the fractures are not requested to be completely coincided with nodes of bed rocks so that the three-dimensional work is easier. A numerical simulation program is complied for realizing the method; and the method develops a numerical simulation theory and method of the fracture-cavity oil reservoir and scientifically realizes the simulation on the fracture-cavity oil reservoir.

Description

technical field [0001] The invention belongs to the field of oil and gas field development, especially for fracture-cavity oil reservoirs, analyzing the technical content of formation pressure and oil-water distribution under time and space, and specifically relates to a numerical simulation method for a coupled oil reservoir. Background technique [0002] At present, research on numerical simulation of fractured-vuggy reservoirs at home and abroad has just begun. Stanford University in the United States carried out research on the discrete fracture network (DFN) model for fractured reservoirs, which initially solved the numerical simulation problem of discrete fractured reservoirs with small computing power, but for large caves (length, Width and height are greater than 0.5 meters) and large fractures (also called extra-large fractures, the fracture opening is greater than 10 mm, and the extension length is greater than 500 meters) are not considered; American A&M Universit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 康志江袁向春赵艳艳李江龙张允崔书岳张杰
Owner CHINA PETROLEUM & CHEM CORP
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