A Method of Using Digital Core Simulation to Calculate Core Permeability
A technology for core permeability and simulation calculation, which is applied in the field of core permeability calculation using digital core simulation, can solve the problems of low calculation accuracy, long calculation time, complicated simulation method, etc., so as to improve the accuracy and ensure smooth fluid flow all the time. , the effect of shortening the time
Active Publication Date: 2018-04-20
清能艾科(深圳)能源技术有限公司
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In summary, the existing rock permeability simulation calculation methods have problems such as low calculation accuracy, long calculation time, complex simulation methods, and limited representativeness of calculation results.
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[0084] Adopt the method of the present invention to adopt digital rock core simulation to calculate rock core permeability, use mirror image boundary boundary as the boundary condition of LBM, and use mass force to be 0.01N to drive fluid flow, and use the calculation formula of this rock core permeability: where k is expressed as permeability, F is expressed as mass force, f i Expressed as a density distribution function, e i Expressed as a function of velocity, τ as the relaxation time, and Δx as the scan resolution. The present invention adopts the method of digital rock core simulation to calculate the rock core permeability, and the time for calculating the rock core permeability is about 3 hours, and the calculated rock core permeability is 132mD.
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The invention relates to a method for calculating core permeability by adopting digital core simulation. The method comprises the following steps: a, a physical model of porous core media is simulated with the Lattice Boltzmann Method; b, physical field initialization and boundary treatment are performed on the physical model of the porous core media, according to the boundary treatment, mirror boundary is taken as a boundary condition for the Lattice Boltzmann Method, and a simulation area and a plurality of mirror areas with the same structure with the simulation area can be obtained; c, mass force is used for driving a fluid to flow in the simulation area; d, a density distribution function of the simulation area is calculated according to the treated physical model of the porous core media; e, the core permeability is simulated and calculated according to the mass force and the density distribution function. With adoption of the method, the core permeability calculating accuracy is improved, and the core permeability calculating time is shortened.
Description
technical field [0001] The invention relates to a method for calculating the permeability of rock core by using digital rock core simulation. Background technique [0002] The porosity, permeability and oil saturation of rock are crucial in the evaluation of oil and gas reserves, and the accuracy of the data will directly affect the evaluation of oil and gas reserves, and even the stock price and financial borrowing ability of oil and gas companies. [0003] At present, the traditional test method of core characteristic parameters is obtained through direct laboratory measurement. Although the test results are highly accurate, there are problems such as high test cost and long time consumption. Especially for low-permeability reservoirs, accurate measurements of core permeability can take days or even months. [0004] Digital core simulation is one of the latest cutting-edge technologies in the field of oil and gas exploration and development. At present, there are three m...
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IPC IPC(8): G06F17/50
CPCG06F30/17
Inventor 龙威昝成
Owner 清能艾科(深圳)能源技术有限公司
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