Shale oil complex fracture network discrete fracture continuous medium mixing numerical simulation method

A technology for numerical simulation and discrete fractures, applied in CAD numerical modeling, design optimization/simulation, etc., can solve problems such as low calculation efficiency, failure of dual-media models to describe fracture details, large number of discrete grids, etc. Convenience, easy mine application and promotion, and objective calculation results

Pending Publication Date: 2020-04-24
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0005] The current numerical simulation methods for complex fracture systems in shale oil reservoirs have shortcomings in terms of calculation efficiency and calculation accuracy. For example,

Method used

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  • Shale oil complex fracture network discrete fracture continuous medium mixing numerical simulation method
  • Shale oil complex fracture network discrete fracture continuous medium mixing numerical simulation method
  • Shale oil complex fracture network discrete fracture continuous medium mixing numerical simulation method

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Embodiment 1

[0091] Step (1) Analyze the fracturing construction status of shale oil reservoirs, determine the properties of hydraulic fractures in the fracturing stimulation area, and explicitly characterize the hydraulic fractures. Such as Figure 4 For the geological model of this case, the basic parameters of the model are as follows Figure 10 , in which 3 hydraulic fractures and 20 large-scale natural fractures developed.

[0092] Step (2) Establishing a mathematical model of hydraulic fracture-natural fracture and matrix seepage after hydraulic fracturing. The seepage mathematical model fully refers to formula (1) (2).

[0093] Step (3) Establish a mixed numerical simulation mathematical model of embedded discrete fractures and continuous media, in which hydraulic fractures are processed by embedded discrete fracture models, mass transfer between natural fractures and matrix in reservoirs is processed by dual-media models, natural fractures The channeling flow with the matrix con...

Embodiment 2

[0097] Step (1) Analyze the fracturing construction status of shale oil reservoirs, determine the properties of hydraulic fractures in the fracturing stimulation area, and explicitly characterize the hydraulic fractures. Such as Figure 7 For the geological model of this case, the basic parameters of the model are as follows: Figure 11 , where multiple hydraulic fractures develop.

[0098] Step (2) Establishing a mathematical model of hydraulic fracture-natural fracture and matrix seepage after hydraulic fracturing. The seepage mathematical model fully refers to formula (1) (2).

[0099] Step (3) Establish a mixed numerical simulation mathematical model of embedded discrete fractures and continuous media, in which hydraulic fractures are processed by embedded discrete fracture models, mass transfer between natural fractures and matrix in reservoirs is processed by dual-media models, natural fractures The channeling flow with the matrix considers the unsteady state channeli...

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Abstract

The invention discloses a shale oil complex fracture network discrete fracture continuous medium mixing numerical simulation method which comprises the following steps: analyzing the fracturing construction condition of a shale oil reservoir, determining the hydraulic fracture property of a fracturing transformation area, and carrying out explicit representation on hydraulic fractures; establishing a seepage mathematical model of the hydraulic fracture-natural fracture and the matrix after hydraulic fracturing transformation; establishing an embedded discrete fracture and continuous medium mixed numerical simulation mathematical model; constructing an embedded discrete fracture and continuous medium model mixed numerical simulation model which comprises a single-phase or oil-water two-phase flow numerical simulation model, and performing solving; and predicting the yield of the tight reservoir under different fracture network transformation conditions by using the model. The conditionthat matrix-natural fracture-hydraulic fracture multi-medium flowing exists in a reservoir can be handled; the problem that an existing commercial numerical simulation method cannot accurately represent the fracturing transformation area is solved, and the calculation result is more objective and accurate.

Description

technical field [0001] The disclosure relates to a new method for numerical simulation of shale oil complex fracture network discrete fracture continuous medium mixed numerical simulation, which belongs to the field of unconventional oil and gas development. Background technique [0002] Shale oil reservoirs generally have storage and flow spaces such as artificially fractured fractures-natural fractures-matrix. Large-scale hydraulic fractures have the highest fluid flow capacity, followed by mesoscale natural fractures, and the worst in the matrix. Currently, fracture-matrix characterization methods in unconventional oil and gas are mainly divided into two categories: dual-media model and discrete fracture model. The dual-medium model assumes that there is a representative unit body, and the matrix and fractures have relatively uniform properties, which has advantages in terms of computational efficiency. Among them, the shape factor is the most important parameter in the ...

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Application Information

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IPC IPC(8): G06F30/20G06F111/10
Inventor 徐建春秦婳婷周文新雷征东
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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