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Numerical simulation method for large-scale fractured reservoir

A numerical simulation, large-scale technology, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as low computational efficiency, unclear physical meaning, and inability to strictly guarantee local quality conservation in oil reservoirs

Active Publication Date: 2014-10-22
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0004] To sum up, the current numerical simulation methods of various conventional large-scale fractured reservoirs have different problems: the method based on the single pore medium model has the problem of low calculation efficiency; the method based on the dual pore medium model is only applicable to Reticular fractured reservoirs with high degree of fracture development and good connectivity; the method based on the equivalent continuum model is difficult to determine its effectiveness, and the equivalent permeability tensor of fractured reservoirs is difficult to solve; the method based on discrete fractures The model can more realistically describe the geological distribution characteristics of large-scale fractures, but the finite element numerical calculation format is used for simulation, which has a large amount of calculation and unclear physical meaning, and cannot strictly guarantee local mass conservation in reservoirs with large-scale fractures And other issues

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  • Numerical simulation method for large-scale fractured reservoir
  • Numerical simulation method for large-scale fractured reservoir

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Embodiment 1

[0140] Research such as image 3 The shown reservoir model contains large-scale fractures, its size is W(1m)×H(1m), and the thickness of the reservoir is 10cm. It is assumed that the bedrock of the model is homogeneous and isotropic, and the porosity of the bedrock is φ=0.2. Permeability K m =10 -3 μm 2 , in the lower left corner of the model (0,0)m is an injection well, injecting water at a rate of 0.01PV / d, and in the upper right corner (1,1)m is a production well, producing liquid at a rate of 0.01PV / d. Assuming that the initial saturated oil, irreducible water saturation and residual oil saturation in the model are all 0, the viscosity of water μ w =1mPa·s, oil viscosity μ o =5mPa·s, the density of water ρ w =1000kg / m 3 , the density of oil ρ o =800kg / m 3 . There is a fracture with an azimuth angle θ in the model, its center coincides with the center point of the model, its opening e=1mm, and the fracture permeability K f = e 2 / 12=8.33×10 4 μm 2. In the disc...

Embodiment 2

[0151] Figure 7 The shown reservoir model contains complex large-scale fractures. The size of the reservoir is 300m×300m and the thickness is 10m. There are 3 fractures in the reservoir, and the starting coordinates of the fractures are (30, 150), (240, 225) , (125, 30), (200, 275) and (50, 100), (250, 50). Porosity φ=0.2, permeability K of homogeneous and isotropic bedrock m = 1μm 2 , oil-water physical parameters and fracture parameters are the same as those in Example 1. Water-phase relative permeability of bedrock and fractures Relative permeability of oil phase k ro =(1-S e ) 2 , where S e =(S w -S wr ) / (1-S wr -S or ), the residual oil saturation is 0.2, the initial reservoir pressure is 10MPa, and the injection well and production well velocity are both 10m 3 / day.

[0152] Based on this, the boundary information file, fracture information file and well information file of the reservoir are established. Mesh division can be obtained as Figure 8 The 137...

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Abstract

The invention belongs to the field of oil-gas field development and provides a numerical simulation method for a large-scale fractured reservoir. The method includes: taking large-scale fractures in the reservoir as an inner boundary of the reservoir to perform reduction of dimensionality, setting up a geometric model of the reservoir, adopting triangular meshes for geometric subdivision of the geometric model of the reservoir to form discrete units, geometric information description files, geometric discrete information files and well information description files of the reservoir, setting up numerical computation units based on the discrete units, setting up a mathematical model representing fluid flow of such reservoirs, adopting an integral method for setting up a numerical computation format on each numerical computation unit to form a large-scale system of linear algebraic equations, and solving, so that numerical simulation of the large-scale fractured reservoir is realized. By adoption of the numerical simulation method for the large-scale fractured reservoir, the large-scale fractured reservoir can be represented accurately, and the method is definite in physical meaning and well adaptable to numerical simulation of the large-scale fractured reservoir.

Description

technical field [0001] The invention belongs to the field of oil and gas field development, and in particular relates to a numerical simulation method for large-scale fractured oil reservoirs. Background technique [0002] Large-scale fractured reservoirs refer to reservoirs with fractures with an opening greater than 1 mm. Large-scale fractures play a special diversion role in the reservoir, and their existence leads to strong heterogeneity of the reservoir, resulting in complex seepage mechanisms and relatively low recovery factors in the reservoir. In order to efficiently develop such oil For reservoirs, it is necessary to use numerical simulation methods to accurately simulate the water flooding development process, design a reasonable development plan, avoid water intrusion along large-scale fractures, and achieve the purpose of improving oil recovery. [0003] At present, in the numerical simulation of large-scale fractured reservoirs, conventional continuous media mo...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 吕心瑞张宏方刘中春
Owner CHINA PETROLEUM & CHEM CORP
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