Method for calculating unconventional reservoir fracturing yield-increasing transformation area

A calculation method and reservoir compaction technology, applied in calculation, design optimization/simulation, image data processing, etc., can solve problems such as volume calculations that cannot be quickly realized for production increase and reconstruction

Active Publication Date: 2020-01-31
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0005] The present invention provides a calculation method for the fracturing stimulation area of ​​an unconventional reservoir, the purpose of which is to solve the problem that the existing technology cannot quickly realize the calculation of the stimulation volume, and consider the influence of the fracture density and azimuth angle on the stimulation volume to realize the stimulation Rapid and accurate prediction of stimulated volume, guiding the optimal design of volume fracturing in horizontal wells in unconventional reservoirs

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  • Method for calculating unconventional reservoir fracturing yield-increasing transformation area
  • Method for calculating unconventional reservoir fracturing yield-increasing transformation area
  • Method for calculating unconventional reservoir fracturing yield-increasing transformation area

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Embodiment 1

[0109] The present invention provides a calculation method for unconventional reservoir fracturing stimulation area, comprising the following steps:

[0110] Step S1 considers the fractured reservoir as a dual continuum reservoir, according to the mass conservation equation of the fluid in the natural fracture system, combined with the natural fracture activation criterion, the fracture width equation, the cubic law, the full tensor permeability conversion equation and the fracture porosity The calculation method is used to establish the equivalent mathematical model of two-dimensional stimulation volume calculation, and the initial and internal and external boundary conditions of the mathematical model are given;

[0111] Step S2 uses the finite difference method to numerically discretize the mathematical model, numerically solves the established two-dimensional stimulation volume prediction equivalent mathematical model, and provides a mathematical model solution method;

[...

Embodiment 2

[0204] The invention is a method for calculating the volume of unconventional reservoir fracturing reconstruction, and the invention includes the following steps:

[0205] Considering the fractured reservoir as a double continuum reservoir, according to the mass conservation equation of the fluid in the natural fracture system, combined with the natural fracture activation criterion, the fracture width equation, the cubic law, the full tensor permeability conversion equation and the calculation of the fracture porosity method, establish the equivalent mathematical model of two-dimensional stimulation volume calculation, and give the initial and internal and external boundary conditions of the mathematical model;

[0206] During hydraulic fracturing, natural fractures are activated and expanded by fracturing fluids, forming a fracture network with a certain conductivity. When simulating the production performance of shale gas wells, the dual porous media model is often used to ch...

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Abstract

The invention relates to a method for calculating an unconventional reservoir fracturing yield-increasing transformation area. The method for calculating the volume fracturing transformation area comprises the following steps of: processing a fractured reservoir into a dual continuous medium reservoir, establishing a fluid mass conservation equation in a fracture system, and establishing a two-dimensional reconstruction volume calculation equivalent mathematical model according to a natural fracture activation criterion, a fracture width equation, a full tensor permeability conversion equation, a cubic law and a fracture porosity calculation method; in combination with initial and inner and outer boundary conditions of the mathematical model, solving a fluid substance conservation equationand a crack width equation in the crack system through iterative coupling, the crack fluid pressure and the crack average width in each grid block are obtained, and therefore two key parameters including the size of a volume transformation yield increasing area and the crack average width are obtained. According to the method, the influence of the natural fracture density and the fracture azimuthangle is considered, the size of an unconventional reservoir volume fracturing production increasing area and fracture width distribution can be rapidly and accurately evaluated, and unconventional reservoir hydraulic fracturing optimization design is guided.

Description

technical field [0001] The invention relates to the technical field of unconventional oil and gas stimulation and transformation, in particular to a calculation method for unconventional reservoir fracturing stimulation and transformation areas. Background technique [0002] The simulation of shale gas reservoir production dynamics after fracturing shows that compared with the traditional two-wing symmetrical plane fractures, forming a network of fractures with a certain conductivity around the main fractures can greatly increase shale gas production, and fracture network parameters, including fracture network The size of the slit network, the conductivity of the slit network, and the complexity of the slit network have an important impact on the yield. The research on post-fracture production of shale gas wells shows that the post-fracture production of shale gas wells has an obvious positive correlation with the volume of injected fracturing fluid, and a new idea that the ...

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Application Information

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IPC IPC(8): G06F30/23G06T17/05G06F111/10
CPCG06T17/05
Inventor李志强戚志林严文德黄小亮肖前华
OwnerCHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY