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A Tight Oil Flow Simulation and Permeability Prediction Method Based on Pore Network Model

A pore network model and flow simulation technology, which is applied in the directions of measurement, earthwork drilling and production, wellbore/well components, etc., can solve problems such as the inability to consider fluid boundary slip, fluid effective viscosity change, etc.

Active Publication Date: 2021-11-09
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0006] The present invention provides a tight oil flow simulation and permeability prediction method based on a pore network model, which overcomes the inability of the traditional pore network model to consider the characteristics of boundary slip and fluid effective viscosity changes when fluid flows in nanopores;

Method used

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  • A Tight Oil Flow Simulation and Permeability Prediction Method Based on Pore Network Model
  • A Tight Oil Flow Simulation and Permeability Prediction Method Based on Pore Network Model
  • A Tight Oil Flow Simulation and Permeability Prediction Method Based on Pore Network Model

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Embodiment

[0041] A tight oil flow simulation and permeability prediction method based on a pore network model, such as figure 1 As shown, it is applied to the simulation of single-phase fluid flow and permeability prediction in tight rock. The initial state of the simulation is set as saturated water in the pore network model, and then the periodic pressure boundary condition is set in the X direction, and there is no flow in the Y and Z directions. Boundaries, including the following steps:

[0042](1) Scan the tight core with a scanning electron microscope to obtain a two-dimensional electron microscope picture, and obtain the geometric information of the pore space of the porous medium: the geometric information of the pore space of the porous medium includes the shape, size and connection relationship of the pore throat;

[0043] (2) Based on the two-dimensional electron microscope picture that step (1) obtains, adopt Markov chain-Monte Carlo method (MCMC) numerical reconstruction ...

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Abstract

The invention relates to a tight oil flow simulation and permeability prediction method based on a pore network model, comprising the following steps: (1) scanning the tight core to obtain a two-dimensional electron microscope picture, and obtaining the geometric information of the porous medium pore space: (2) heavy (3) Extract the pore network model of the digital core to obtain the data file of the dense core pore network model; (4) Obtain the pressure at each pore and the volume at each pore throat (5) Obtain the fluid volume flow Q at the outlet of the pore network model, and calculate the apparent permeability of the pore network model according to Darcy's law. The newly developed pore network model of the present invention overcomes the inability of the traditional pore network model to consider the characteristics of boundary slip and fluid effective viscosity change when the fluid flows in the nanopores.

Description

technical field [0001] The invention relates to a tight oil flow simulation and permeability prediction method based on a pore network model, and belongs to the technical field of numerical simulation of oil and gas field development engineering. Background technique [0002] With the rapid development of various microscopic techniques (scanning electron microscopy, CT, etc.) possible. The pore network model is an effective method for studying fluid flow in porous media at the microscopic level, and it provides an important research platform for simulating fluid flow inside the core. Compared with physical core experiments, it has the advantages of low experimental cost, simple operation and short experimental period. Compared with the digital core, the pore network model has the characteristics of high calculation efficiency. During the calculation, the pores are only used as the storage space of the fluid instead of the flow space. The flow in the pore throat is directly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/10G06F30/28
CPCE21B47/10G06F30/20
Inventor 姚军郭曜豪张磊孙海杨永飞杨谦洪
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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