A Permeability Prediction Method Based on Block Numerical Simulation of Core Scanning Image
A scanning image and numerical simulation technology, which is applied in CAD numerical modeling, special data processing applications, design optimization/simulation, etc., can solve the problems of inability to obtain rock permeability, inability to obtain the volume of characterization units, etc., and achieves significant scientific value and Social benefits, improving development output, and the effect of a wide range of applications
Active Publication Date: 2022-02-15
CHINA UNIV OF PETROLEUM (EAST CHINA)
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However, this patent is only applicable to homogeneous cores, that is, the core pores are evenly distributed and there is a representative unit volume. For heterogeneous cores, effective representative unit volumes cannot be obtained within the core scanning image range, so that it is impossible to obtain accurate rock Permeability
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Embodiment 1
[0045]In this embodiment, the numerical simulation technology is used to predict the permeability of the core, and a CT machine is needed to scan the core. CT machine scanning can perform non-destructive detection of rock cores, and can understand the internal structure of rock core samples in different geological layers. The CT machine includes: ① X-ray source, used to generate X-rays required for scanning samples; ② Core sample holder, used to fix and precisely rotate the rock core sample to be scanned; ③ X-ray detector, used to detect the absorption of the core sample Attenuated X-rays. The above-mentioned components are all connected to a computer, and the computer is used as an operating platform to accurately control the parameters of the above-mentioned components, and output the scanning data of the core sample.
[0046] A method for predicting permeability based on block numerical simulation of core scanning images, the specific steps are as follows:
[0047] (1) Se...
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The invention relates to a method for predicting permeability based on block numerical simulation of rock core scanning images, comprising: (1) scanning the rock core to obtain a three-dimensional digital image of the whole rock core; (2) performing binary segmentation; (3) performing Block processing to obtain the core image data of each small block; (4) simulation calculation to obtain the permeability and porosity of the core image of each small block; (5) fitting the permeability and porosity of the core image of each small block Porosity, to obtain the relationship between permeability and porosity; (6) Calculate the porosity of the entire core image, and obtain the permeability of the entire core image according to the relationship between permeability and porosity. The present invention can obtain a porosity-permeability relationship applicable to other core samples in the whole stratum by modeling a core sample, thereby being able to predict the permeability of any core sample in the reservoir, overcoming the traditional permeability Calculation or experiment methods have low precision and inaccurate results.
Description
technical field [0001] The invention relates to a rock core permeability prediction method based on CT scanning, digital rock core and numerical simulation, and belongs to the technical field of numerical simulation of oil and gas field development engineering. Background technique [0002] In the process of oil and gas field development, macroscopic properties such as porosity and permeability in the reservoir have a crucial impact on the reserves and production of oil and gas in the reservoir. The macroscopic properties of porosity and permeability can be described by the microstructure of rocks. The microscopic features of the rock include the pores, throats, and skeleton features inside the core, which involves the microscopic scale of micron or even nanometer. The microscopic structure of a rock is fundamental, while its macroscopic features are merely superficial. In order to truly study the physical parameters of reservoir rocks, it is necessary to go deep into the ...
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IPC IPC(8): G06F30/20G06F111/10
CPCG06F30/20
Inventor 景文龙张磊姚军杨永飞孙海
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)