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Method for building simulation model of rock core scale

A simulation model and construction method technology, applied in design optimization/simulation, special data processing applications, instruments, etc., can solve problems such as strong randomness and inability to truly reflect the characteristics of rock cores, and achieve fast simulation speed

Active Publication Date: 2018-11-23
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
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Problems solved by technology

Although some scholars have established a pore network model through fractal theory, the randomness of this model is too strong to truly reflect the characteristics of the core.

Method used

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  • Method for building simulation model of rock core scale
  • Method for building simulation model of rock core scale
  • Method for building simulation model of rock core scale

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Experimental program
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Embodiment

[0091] figure 1 A flow chart showing the steps of a method for building a core-scale simulation model according to the present invention.

[0092] The core-scale simulation model according to an exemplary embodiment of the present invention includes:

[0093] Step 1, measure the porosity and test permeability of the target rock core through experiments;

[0094] Step 2, obtaining the pore radius probability distribution of the target core based on the mercury injection experiment;

[0095] Step 3, establishing a permeability calculation model to obtain the distribution of permeability;

[0096] Step 4, based on the permeability anisotropy parameters, establish a core-scale simulation model;

[0097] Step 5, calculating the apparent permeability according to the core-scale simulation model;

[0098] Step 6, calculate the error rate between the apparent permeability and the test permeability, if the error rate is less than the set error rate, then obtain the core-scale simul...

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Abstract

The invention discloses a method for building a simulation model of a rock core scale. The method comprises the steps of 1, measuring the porosity and the test permeability of a target rock core through experiments; 2, acquiring the pore radius probability distribution of the target rock core based on a mercury injection experiment; 3, building a permeability calculation model, and acquiring the permeability distribution; 4, based on permeability anisotropy parameters, building the simulation model of the rock core scale; 5, calculating the apparent permeability according to the simulation model of the rock core scale; and 6, calculating an error rate of the visual permeability and the test permeability, and when the error rate is smaller than a set error rate, acquiring the simulation model of the rock core scale, otherwise, repeating the steps 3-6, until the error rate is smaller than the set error rate, and acquiring the simulation model of the rock core scale at the moment. The method has the advantages that based on the anisotropy of the permeability, the non-homogeneity and anisotropy characteristics of a rock core can be truly reflected; the simulation model can simulate a flowing mechanism on a large scale; and the simulation speed is higher.

Description

technical field [0001] The invention relates to the field of oil and gas field development, in particular to a method for building a core-scale simulation model. Background technique [0002] When immiscible high-viscosity fluid is displaced by low-viscosity fluid, viscous fingering will occur at the displacement front. Conventional numerical simulation software cannot truly reflect the viscous fingering phenomenon due to the large grid size. Therefore, the current numerical simulation methods for viscous fingering are mainly microscopic simulation methods. The most commonly used to build lattice models and network models. [0003] The lattice model is a computer simulation method that originates from Brownian motion of molecules in physics and uses a simple microscopic model to simulate fluid flow. There are two kinds of lattice models: lattice gas automata and lattice Boltzmann method, and lattice Boltzmann method is the development of lattice gas automata method. Alth...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 计秉玉聂俊吕成远王友启何应付于洪敏
Owner CHINA PETROLEUM & CHEM CORP
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