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A Numerical Simulation Method for Large-Scale Fractured Reservoirs

A numerical simulation, large-scale technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problem that the equivalent permeability tensor of fractured reservoirs is difficult to solve, the reservoir cannot strictly guarantee the local mass conservation, Problems such as ambiguity in physical meaning can achieve the effect of ensuring local mass conservation, improving computational efficiency, and strong operability

Active Publication Date: 2018-02-13
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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  • A Numerical Simulation Method for Large-Scale Fractured Reservoirs

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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 discr...

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 follows: Figure ...

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Abstract

The invention provides a large-scale fractured oil reservoir numerical simulation method, which belongs to the field of oil and gas field development. The method uses the large-scale fractures in the reservoir as the inner boundary of the reservoir to perform dimension reduction processing, establishes a geometric model of the reservoir, and then uses a triangular grid to geometrically subdivide the geometric model of the reservoir to form discrete units, and at the same time forms a reservoir Geometric information description files, geometric discrete information files and well information description files, construct numerical calculation units on the basis of discrete units, establish mathematical models representing fluid flow in such reservoirs, and use integral methods to establish their numerical values ​​on each numerical calculation unit In the calculation format, large-scale linear algebraic equations are formed and solved, so as to realize the numerical simulation of large-scale fractured reservoirs. The invention can accurately characterize large-scale fractured reservoirs, has clear physical meaning, and has good adaptability to numerical simulation of large-scale fractured reservoirs.

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...

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Application Information

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