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Preparation method of artificial shale rock cores based on inorganic glue ratio

A technology for shale core and artificial core, which is applied in the field of artificial shale core preparation based on the proportion of inorganic glue, can solve the problems of establishing a response template of a single parameter and a logging curve, and achieves the improvement of cementation strength and a simple preparation process. Effect

Inactive Publication Date: 2018-08-21
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the different porosity, mineral composition and content, stress, and pore fluid type of natural cores, it is impossible to use natural core tests to establish response templates for single parameters and logging curves

Method used

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  • Preparation method of artificial shale rock cores based on inorganic glue ratio
  • Preparation method of artificial shale rock cores based on inorganic glue ratio

Examples

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Embodiment 1

[0017] Please refer to figure 1 , the embodiment of the present invention provides a kind of artificial shale core preparation method based on the proportion of inorganic glue, comprising the following steps:

[0018] (1) Take calcite powder, quartz sand, clay mineral powder, coal powder, plagioclase powder, potassium feldspar powder by mass percentage and mix and stir to obtain mineral powder mixture; Described calcite powder, quartz sand, clay mineral powder, coal Powder, plagioclase powder, and potassium feldspar powder account for 3% to 6%, 20% to 55%, 25% to 65%, 3% to 12%, 3% to 6%, and 3% to 6%, the particle size is 2000 mesh;

[0019] (2) Prepare inorganic glue, take kaolin, water, sodium silicate, sodium fluorosilicate, polyvinyl alcohol by mass percentage and mix and stir to obtain inorganic glue; said kaolin, water, sodium silicate, sodium fluorosilicate, The mass percentage of polyvinyl alcohol in inorganic glue is 6%-8%, 18%-25%, 45%-55%, 15%-18%, 6%-8%; usually...

Embodiment 2

[0025] Please refer to figure 1 , the embodiment of the present invention provides a kind of artificial shale core preparation method based on the proportion of inorganic glue, comprising the following steps:

[0026] (1) Take calcite powder, quartz sand, clay mineral powder, coal powder, plagioclase powder, potassium feldspar powder by mass percentage and mix and stir to obtain mineral powder mixture; Described calcite powder, quartz sand, clay mineral powder, coal Powder, plagioclase powder, and potassium feldspar powder account for 4%, 20%, 60%, 4%, 4%, and 4% of the mass percentage of the artificial core; the clay mineral powder is montmorillonite;

[0027] (2) Prepare inorganic glue, take kaolin, water, sodium silicate, sodium fluorosilicate, polyvinyl alcohol by mass percentage and mix and stir to obtain inorganic glue; said kaolin, water, sodium silicate, sodium fluorosilicate, The mass percentage of polyvinyl alcohol in the inorganic glue is 7%, 20%, 50%, 16%, and 7%;...

Embodiment 3

[0031] Please refer to figure 1 , the embodiment of the present invention provides a kind of artificial shale core preparation method based on the proportion of inorganic glue, comprising the following steps:

[0032] (1) Take calcite powder, quartz sand, clay mineral powder, coal powder, plagioclase powder, potassium feldspar powder by mass percentage and mix and stir to obtain mineral powder mixture; Described calcite powder, quartz sand, clay mineral powder, coal Powder, plagioclase powder, and potassium feldspar powder account for 4%, 40%, 40%, 4%, 4%, and 4% of the mass percentage of the artificial core;

[0033] (2) Prepare inorganic glue, take kaolin, water, sodium silicate, sodium fluorosilicate, polyvinyl alcohol by mass percentage and mix and stir to obtain inorganic glue;

[0034] (3) adding the mineral powder mixture into the inorganic glue, and stirring evenly to obtain artificial rock core raw materials;

[0035] (4) Place the obtained artificial core raw mater...

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Abstract

The invention discloses a preparation method of artificial shale rock cores based on an inorganic glue ratio. The preparation process is simple; inorganic glue is adopted to adjust the strength, the porosity, the permeability, and the homogeneous degree of prepared artificial shale rock cores to be similar to those of natural shale rock cores. According to the preparation method, a mineral raw material powder is mixed with the inorganic glue, and an obtained mixture is subjected to pressing in a rock core diagenesis simulation system so as to obtain artificial rock cores of different componentproperties; and the component properties of the obtained artificial shale rock cores are modified to be close to those of natural rock cores. The prepared artificial shale rock cores are subjected totest analysis so as to obtain related data such as well logging curve, and establish a shale gas reservoir porosity prediction equation, so that it is convenient for guidance of on-site shale gas exploitation.

Description

technical field [0001] The invention belongs to the technical field of artificial rock core preparation, and in particular relates to an artificial shale core preparation method based on the ratio of inorganic glue. Background technique [0002] The shale porosity parameter is an important parameter for evaluating shale storage capacity and shale gas resources, and it is also a basic research for shale gas resource investigation and area selection. At present, accurate data on the porosity of shale gas reservoirs can only be obtained through laboratory testing. Testing reservoir porosity in laboratories is not only limited by drilling and coring, but also due to long testing time and high cost, generally only testing Limited data for the target interval. In order to realize the rapid and accurate prediction of the total porosity and effective porosity of shale gas reservoirs, it must be realized based on the logging curves, so establishing the correlation between the loggin...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N15/08C04B28/26
CPCG01N1/28C04B28/26G01N15/082C04B14/10C04B24/2623C04B14/28C04B14/06C04B18/06C04B14/045C04B14/041
Inventor 李冠华石万忠徐壮吴睿
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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