Method for determinating permeability of fluid in porous medium

A technology of porous media and measurement methods, which is applied in the field of measurement of porous media permeability, can solve the problems of long time-consuming, difficult operation of radial flow core displacement, and few calculation methods of radial flow oil and water, etc., to overcome defects, Accurately Calculated Effects

Inactive Publication Date: 2018-06-29
CHINA UNIV OF MINING & TECH
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Problems solved by technology

However, due to the difficulty and time-consuming operation of radial flow core displacement experiments, and the lack of theoretical

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  • Method for determinating permeability of fluid in porous medium
  • Method for determinating permeability of fluid in porous medium
  • Method for determinating permeability of fluid in porous medium

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Embodiment 1

[0039] Such as Figure 1-Figure 9 As shown, the measurement method of fluid permeability in porous media provided by this embodiment is as follows by carrying out a radial flow core displacement experiment on a natural water-wet sandstone reservoir in an oilfield and carrying out a radial flow core displacement experiment in conjunction with the accompanying drawings. The content and realization principle of the present invention will be described in detail.

[0040] 1. Carry out radial flow core displacement experiments and collect phase permeability experiment data

[0041] according to figure 1 The radial flow core displacement experimental device is designed as shown, and the radial flow core displacement experiment is carried out on the disc-shaped core samples taken from the natural water-wet sandstone reservoir in an oilfield. The radial flow characteristics are as follows: figure 2 Table 1 shows the basic parameters of simulating disc-shaped rock samples. During th...

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Abstract

The invention provides a method for determinating the permeability of a fluid in a porous medium. The method comprises the following steps: establishing a control model for fluid flow in the porous medium by using a steady-state Stokes equation, and dividing the porous medium into a plurality of staggered grids; enabling a fluid to flow in the porous medium in a first direction, establishing a least squares objective function by selecting displacement pressure differences at different times and cumulative production as dynamic data on the basis of a radial-flow core displacement experiment, characterizing an oil-water relative permeability curve by using a cubic uniform spline model, and in combination with a radial-flow numerical simulator, continuously adjusting a control parameter vector of a phase permeability characterizing model by a Levenberg-Marquardt algorithm so as to minimize a quadratic sum of errors of observed values and predicted values of the dynamic data. According tothe scheme, the oil-water relative permeability curve can be accurately calculated on the basis of processing of radial-flow core displacement experimental data, and an effective tool is provided forstudying the percolation mechanism of oil, water, asphalt and a resin fluid in the porous medium.

Description

technical field [0001] The invention relates to the technical field of a method for measuring the permeability of a porous medium, in particular to a method for measuring the permeability of a fluid in a porous medium. Background technique [0002] At present, the oil-water relative permeability curve is an important data in reservoir development, which can reflect the seepage law of oil and water phase fluid in porous media. The oil-water relative permeability curve is mainly obtained through unidirectional flow core displacement experiments, and the calculation method is mainly based on analytical methods such as JBN. However, due to the ideal assumption conditions of the analytical method, the calculation accuracy of the relative permeability curve is often low. Numerical inversion methods based on automatic history fitting technology have developed rapidly in the past decade. Compared with the analytical method, when the numerical inversion method is applied indoors, it...

Claims

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Application Information

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IPC IPC(8): G01N15/08
CPCG01N15/08
Inventor 王启立于鸣泉巩建南
Owner CHINA UNIV OF MINING & TECH
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