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Preparation method for artificial core with preset mesoscopic damage

An artificial core and mesoscopic technology, which is applied in the field of preparation of artificial core with preset mesoscopic damage, can solve the problems of not being able to truly understand the properties of the stratum, avoid the dispersion of experimental data and the difficulty of data comparison and analysis, facilitate operation, The effect of stabilizing physical properties

Inactive Publication Date: 2019-01-11
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the process of oil and gas exploration and development, if the simulated formation core is prepared by the general method, it is inevitable that the formation properties cannot be truly understood

Method used

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  • Preparation method for artificial core with preset mesoscopic damage
  • Preparation method for artificial core with preset mesoscopic damage

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Such as figure 1 and figure 2 As shown, this embodiment provides a method for preparing artificial rock core with preset mesoscopic damage. The preparation method mainly includes the following steps:

[0030] (1) Mix cement and quartz sand in a mass ratio of 1:3, stir evenly to obtain mixture A; wherein the cement is composite Portland cement, and the quartz sand is selected from 20 mesh;

[0031] (2) Prepare spherical Fischer-Tropsch wax, whose melting point is 96°C, add Fischer-Tropsch wax with a volume ratio of 5% to mixture A, add water according to the ratio of cement to water mass ratio 1:0.65 in mixture A and stir evenly , the mixture B is prepared, and the final water accounts for 20-23% by mass of the mixture B;

[0032] (3) Pour the mixture B into a square mold with lubricating oil on the inner wall, wherein the lubricating oil is selected from GB11121-95 type lubricating oil, and after being stable for 12 hours, the rock block is demoulded to obtain the ro...

Embodiment 2

[0038] This embodiment provides a method for preparing artificial rock core with preset mesoscopic damage. The method steps are as described in Embodiment 1, the difference is that the quartz sand in step (1) is selected from 50 mesh, and the cement and quartz sand are selected according to the mass. Mix at a ratio of 1:1.

Embodiment 3

[0040] This example provides a method for preparing artificial rock core with preset mesoscopic damage, the method steps are as described in Example 1, the difference is that cement and quartz sand are mixed at a mass ratio of 1:1.5.

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Abstract

The invention relates to a preparation method for an artificial core with the preset mesoscopic damage. The preparation method comprises the following steps of: mixing and stirring paraffin granules and the cement slurry; putting paraffin granules and the cement slurry into a mold for solid molding; obtaining a rock block after demoulding; then performing the immersion cured, high temperature displacement, and toluene washing for the rock block; and finally obtaining a standard rock sample. The standard rock sample prepared by the method realize the simulation for mesoscopic damage of a natural rock by using hard paraffin, and overcomes the defect that the artificial core was prepared by mixing cement and quartz sand in proportion in the past, only pore characteristics and permeability characteristics of the natural rock can be simulated, and mesoscopic damage of the rock during the formation process cannot be presented. The prepared artificial core not only has the pore characteristics and the permeability characteristics of the natural core, but also has the mesoscopic damage inside the natural core, physical properties are relatively stable, and the size is the standard core, sothat the natural core of the reservoir for indoor research simulation experiments of oil exploration and oil and gas field development projects can be completely replaced.

Description

technical field [0001] The invention relates to a method for preparing artificial rock core with preset mesoscopic damage, and belongs to the technical field of artificial rock core preparation. Background technique [0002] Rock material is a kind of heterogeneous medium, and each stage of its formation is subject to various destructive effects. It can be said that the internal structure of rock is quite complicated from the microscopic point of view. In oilfield exploration and development and production, understanding the true formation conditions is inseparable from core experiment analysis. The source of natural cores is limited and expensive, and the physical properties of rocks will vary depending on the location where they are collected. [0003] The core prepared by the general method does not take into account the mesoscopic damage inside the rock, but the different degrees of damage in the mesoscopic inside the rock often have a key impact on the physical properti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N1/36
CPCG01N1/286G01N1/36G01N2001/2866G01N2001/2873G01N2001/366
Inventor 吴飞鹏丁乾申尉雪梅李德晏焕峰孟鹏程
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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