Pore network model-based calculation method of three-phase relative permeability

A pore network model, relative permeability technology, applied in permeability/surface area analysis, suspension and porous material analysis, measurement devices, etc., can solve the problem of error, can not consider the basic physical process of oil-gas-water three-phase seepage, time-consuming and other problems

Inactive Publication Date: 2015-11-04
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0003] At present, the empirical formula is commonly used to estimate the three-phase relative permeability. The empirical formula is used to calculate the three-phase relative permeability from two-phase seepage data. Although this method is fast, it cannot consider the basic physical process of oil-gas-water three-phase seepage. The intrinsic physical mechanism of phase seepage cannot be well presented, and there are large errors
At the same time, although there have been some experimental studies on oil-gas-water three-phase, generally speaking, it is difficult to obtain the relative permeability of oil-gas-water three-phase by these experimental methods, and the experimental cost is expensive and time-consuming

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  • Pore network model-based calculation method of three-phase relative permeability
  • Pore network model-based calculation method of three-phase relative permeability
  • Pore network model-based calculation method of three-phase relative permeability

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Embodiment

[0071] In this embodiment, an example of constructing a three-dimensional network model for a sand-fill pipe filled with 80-120 mesh quartz sand is used to describe the content and realization principle of the present invention in detail in conjunction with the accompanying drawings: the oil-water two-phase relative permeability curve experiment uses a core of 80 -120 mesh quartz sand filled sand pipe, core length 30cm, diameter 2.5cm, the experimental test was carried out at 80°C, the experiment used the formation water of Zhongerzhong block of Shengli Oilfield, and the simulated oil was Zhongerzhong degassed crude oil and Diesel is prepared at a volume ratio of 2.9:1, with a density of 0.915kg / cm 3 , viscosity 62.4mPa﹒ s, the volume factor is 1.0393.

[0072] A calculation method for three-phase relative permeability based on a pore network model, the specific steps include:

[0073] (1) Use the optical projection method to measure the contact angle of the oil phase and th...

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Abstract

The invention relates to a pore network model-based calculation method of three-phase relative permeability. Based on the construction of a pore network model, an underground rock pore structure is reproduced, and under the condition of coexisting of oil-gas-water three phases inside the rock core, flow of fluids is simulated to obtain three-phase relative permeability. By the utilization of an orthogonal design method during the process, design parameters which fit the best with a two-phase relative permeability curve obtained by an experimental method are selected so as to simulate three-phase flowing based on the pore network model. According to the invention, fluid physical properties and rock structure parameters are fully considered, and the physical process of fluids flowing in a porous medium can be well reproduced. Two-phase flow is very easy to realize by a physical experimental method, and the constructed pore network model is greatly screened during the process of matching results of the two-phase flow experiment.

Description

technical field [0001] The invention relates to a calculation method of three-phase relative permeability based on a pore network model, and belongs to the technical field of numerical simulation of oil and gas field development engineering. Background technique [0002] In order to improve the oil recovery rate of oil reservoirs, in the process of oil and gas field development, gas injection flooding, water and gas alternate injection and other production methods will be adopted, correspondingly, oil, gas and water three-phase seepage problems will often occur. [0003] At present, the empirical formula is commonly used to estimate the three-phase relative permeability. The empirical formula is used to calculate the three-phase relative permeability from two-phase seepage data. Although this method is fast, it cannot consider the basic physical process of oil-gas-water three-phase seepage. The intrinsic physical mechanism of phase seepage cannot be presented well, and there...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
Inventor 杨永飞安森友姚军孙海张磊张琦赵建林杨谦洪宋文辉刘志辉张文杰罗嘉慧
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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