A Calculation Method of Unconventional Reservoir Fracturing Stimulation Area

A calculation method and reservoir compaction technology, applied in calculation, design optimization/simulation, instruments, etc., can solve problems such as volume calculations that cannot be quickly realized for production increase and transformation, and achieve the effect of time-consuming and expensive solutions

Active Publication Date: 2022-04-22
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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  • A Calculation Method of Unconventional Reservoir Fracturing Stimulation Area
  • A Calculation Method of Unconventional Reservoir Fracturing Stimulation Area
  • A Calculation Method of Unconventional Reservoir Fracturing Stimulation 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 present invention relates to a volume calculation method for unconventional reservoir stimulation. The calculation method for the volume fracturing stimulation area: treat the fractured reservoir as a double continuous medium reservoir, establish the fluid mass conservation equation in the fracture system, and use the natural fracture activation criterion , the fracture width equation, the full tensor permeability conversion equation, the cubic law and the calculation method of the fracture porosity, establish an equivalent mathematical model for the two-dimensional reconstruction volume calculation; combine the initial and internal and external boundary conditions of the mathematical model, and iteratively couple to solve the fracture system The fluid material conservation equation and the fracture width equation obtain the fracture fluid pressure and the average fracture width in each grid block, so as to obtain the two key parameters of volume stimulation area size and fracture average width. The method of the invention considers the influence of natural fracture density and fracture azimuth angle, can quickly and accurately evaluate the volume fracturing stimulation area size and fracture width distribution of unconventional reservoirs, and guide the optimal design of hydraulic fracturing of unconventional reservoirs.

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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Patent Type & AuthorityPatents(China)
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