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Method for simulating and evaluating oil production scheme by adopting digital rock core

A digital core and solution technology, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve the problem of inability to directly simulate oil/water interfacial tension and rock wettability changes, and inability to interact with oil/water/rock. Accurate simulation and other problems to achieve the effect of quantitative evaluation of oil production effect and rapid oil production effect

Inactive Publication Date: 2016-10-26
清能艾科(深圳)能源技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method can simulate oil / water two-phase seepage in porous rock media (Blunt Martin J, etc. Pore-scale imaging and modeling[J]. ADVANCES IN WATER RESOURCES(51): 197-216,2013.), although the calculation The speed is faster, but the real three-dimensional pore structure is simplified into a model connected by pipes and balls, which cannot accurately simulate the oil / water / rock interaction, such as the oil / water interfacial tension and rock wettability changes cannot be directly simulated, therefore, It is impossible to carry out effective numerical simulation evaluation for oil production and displacement experiments

Method used

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  • Method for simulating and evaluating oil production scheme by adopting digital rock core
  • Method for simulating and evaluating oil production scheme by adopting digital rock core
  • Method for simulating and evaluating oil production scheme by adopting digital rock core

Examples

Experimental program
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Effect test

Embodiment 1

[0077] Select a rock core sample, use Micro CT to scan the rock core sample, wherein the Micro CT scan resolution is 3 microns, the core sample after the scan has an effective physical volume of 1 mm x 1 mm x 3 mm, and read the core sample 2D image of the cross section.

[0078] The two-dimensional image of the cross-section of the core sample is three-dimensionally reconstructed to obtain a digital file of the three-dimensional structure of the core sample.

[0079] Image recognition, which resolves the digital file of the three-dimensional structure of the core sample, and reads parameters characterizing the porous media of the core.

[0080] According to the parameters in the porous medium of the characterization core, the matrix of the initial condition is set as a medium-porous and medium-permeable sandstone with a porosity of 28% and a permeability of 454 mD, and the numerical simulation of the oil production core displacement experiment is carried out according to the i...

Embodiment 2

[0085] Select a rock core sample, use Micro CT to scan the rock core sample, wherein the Micro CT scan resolution is 3 microns, the core sample after the scan has an effective physical volume of 1 mm x 1 mm x 3 mm, and read the core sample 2D image of the cross section.

[0086] The two-dimensional image of the cross-section of the core sample is three-dimensionally reconstructed to obtain a digital file of the three-dimensional structure of the core sample.

[0087] Image recognition, which resolves the digital file of the three-dimensional structure of the core sample, and reads parameters characterizing the porous media of the core.

[0088] According to the parameters in the porous medium of the characterization core, the matrix of the initial condition is set as a medium-porous and medium-permeable sandstone with a porosity of 28% and a permeability of 454 mD, and the numerical simulation of the oil production core displacement experiment is carried out according to the i...

Embodiment 3

[0094] Select a rock core sample, use Micro CT to scan the rock core sample, wherein the Micro CT scan resolution is 3 microns, the core sample after the scan has an effective physical volume of 1 mm x 1 mm x 3 mm, and read the core sample 2D image of the cross section.

[0095] The two-dimensional image of the cross-section of the core sample is three-dimensionally reconstructed to obtain a digital file of the three-dimensional structure of the core sample.

[0096] Image recognition, which resolves the digital file of the three-dimensional structure of the core sample, and reads parameters characterizing the porous media of the core.

[0097] According to the parameters in the porous medium of the characterization core, the matrix of the initial condition is set as a medium-porous and medium-permeable sandstone with a porosity of 28% and a permeability of 454 mD, and the numerical simulation of the oil production core displacement experiment is carried out according to the i...

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Abstract

The invention relates to a method for simulating and evaluating an oil production scheme by adopting a digital rock core. The method comprises the following steps: scanning a rock core sample so as to obtain two-dimensional images of cross sections of the rock core sample; performing three-dimensional reconstruction on the two-dimensional images of the cross sections of the rock core sample, and reading parameters characterizing the porous media of a rock core; setting initial conditions according to the parameters characterizing the porous media of the rock core, and performing numerical simulation of an oil production rock core displacement experiment by adopting a Boltzmann lattice method according to the initial conditions, wherein displacement liquid is injected into the porous media of the rock core; and calculating the oil production and water production according to the numerical simulation, and simulating a curve of the saturation degree of residual oil along the change of the injection volume of the displacement liquid, and selecting the oil production scheme according to the oil production, water production and curve. The oil production effect can be accurately and fast quantitatively evaluated by using the method for simulating and evaluating the oil production scheme by adopting the digital rock core.

Description

technical field [0001] The invention relates to a method for simulating and evaluating an oil production plan by using a digital rock core. Background technique [0002] In the process of oil and natural gas extraction, 70% of the oil fields are in the high water cut stage, and the comprehensive recovery rate is only about 32%, which means that more than 60% of the oil is still "left" underground. Primary oil recovery refers to the exploitation of oil by using the energy of the oil layer; secondary oil recovery refers to injecting water and gas into the oil layer to supplement energy to extract oil; tertiary oil recovery refers to the use of physical or chemical means to enhance the recovery of crude oil. Oil recovery technologies mainly include chemical flooding, gas flooding, and thermal flooding. By reducing the oil / water interfacial tension, changing rock wettability, changing the oil / water viscosity ratio, and mixing, the effect of increasing crude oil production is hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24G06F17/50
CPCG01N33/24G06F30/367
Inventor 龙威昝成
Owner 清能艾科(深圳)能源技术有限公司
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