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Rock core permeability simulating method and rock core permeability simulating device

A core permeability and simulation method technology, which is applied in the field of core permeability simulation methods and devices, can solve the problems of long calculation period and low accuracy of core permeability simulation results, so as to improve calculation speed, reduce data volume, and improve calculation efficiency Effect

Inactive Publication Date: 2017-02-22
杨康 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In view of this, the purpose of the present invention is to provide a core permeability simulation method and device to solve the problems of long calculation period and low precision of the core permeability simulation results in the prior art

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  • Rock core permeability simulating method and rock core permeability simulating device
  • Rock core permeability simulating method and rock core permeability simulating device
  • Rock core permeability simulating method and rock core permeability simulating device

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Embodiment 1

[0072] The core permeability simulation method provided by the embodiment of the present invention, such as figure 1 shown, including the following steps:

[0073] S101. Read the CT image data of the core

[0074] Place the real rock core on the sample collection platform or sample holder, set parameters such as X-ray intensity, collection layer thickness, and resolution, and then collect the CT image data of the rock core. In this embodiment, the resolution of the CT machine is preferably 5.6938 μm , and then read the acquired two-dimensional CT data.

[0075] S102. Perform binary processing on the CT image data to generate binary CT image data of the porous medium of the rock core

[0076] The acquired two-dimensional CT image data is binarized using a histogram threshold method or an iterative threshold method. In this embodiment, the histogram method is used, and the threshold value is preferably 146.

[0077] S103. Perform three-dimensional reconstruction on the binari...

Embodiment 2

[0129] Such as Figure 12 As shown, this embodiment provides a rock core permeability simulation device, including: a reading module 101 for reading the CT image data of the rock core; a binarization module 102 for binarizing the CT image data to generate binary CT image data of the porous medium of the rock core; the three-dimensional reconstruction module 103 is used to perform three-dimensional reconstruction on the binary CT image data to generate three-dimensional volume data of the rock core; the representation voxel data acquisition module 104, through the three-dimensional volume data Obtain the representative voxel data of the rock core; the physical model module 105 is used to establish a physical model of the rock core according to the representative voxel data, and calculate the macroscopic physical quantity according to the physical model; the permeability calculation module 106 is used to calculate the core permeability according to the macroscopic physical quanti...

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Abstract

The invention provides a rock core permeability simulating method and a rock core permeability simulating device and relates to the technical field of oilfield development. The rock core permeability simulating method includes the steps of reading CT (computed tomography) image data of a rock core; subjecting the CT image data to binarization processing and generating binarized CT image data of porous media of the rock core; subjecting the binarized CT image data to three-dimensional reconstruction and generating three-dimensional data of the rock core; acquiring representative elementary volume data of the rock core through the three-dimensional data; establishing a physical model of the rock core according to the representative elementary volume data and computing macroscopic physical quantity of the physical model, wherein physical model distribution functions are stored according to a sparse matrix storage algorithm; computing rock core permeability according to the macroscopic physical quantity. The rock core permeability simulating method and the rock core permeability simulating device have the advantages that the problem that existing rock core permeability computing efficiency is low is solved, operation speed is increased and permeability computing precision is improved.

Description

technical field [0001] The invention relates to the interdisciplinary field of computational fluid dynamics and oil field exploitation technology, in particular to a method and device for simulating rock core permeability. Background technique [0002] The permeability of porous media is an important embodiment of fluid flow ability in porous media, and it is also a basic parameter in the flow of porous media. Permeability is divided into absolute permeability, effective permeability and relative permeability. According to Darcy's law, the formula of absolute permeability is [0003] [0004] Among them, Q refers to the flow rate through the core under the action of pressure difference ΔP, cm 3 / s; A is the cross-sectional area of ​​the core perpendicular to the flow direction, cm2; L is the length of the core, cm; μ is the fluid viscosity of the core, mPa s; ΔP is the pressure difference at both ends of the core, atm. The unit of K is usually expressed by Darcy (D), wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
CPCG01N15/08
Inventor 杨康朱炼华郭子缘张春华
Owner 杨康