Preparation method of coal-series reservoir group fracturing object model sample taking transition zone into account

A transitional zone and coal series technology, applied in the field of rock sample preparation, can solve problems such as inability to perform accurate simulations, and achieve the effects of saving raw materials, improving efficiency, and simple operation

Inactive Publication Date: 2018-08-17
CHINA UNITED COALBED METHANE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the direction and size of the weak plane cannot be accurately controlled by using oatmeal and shredded paper, it is impossible to accurately simulate the orthogonal weak planes existing in the coal seam, that is, end cleats and face cleats

Method used

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  • Preparation method of coal-series reservoir group fracturing object model sample taking transition zone into account

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Effect test

Embodiment 1

[0030] Such as figure 1 As shown, according to an embodiment of the preparation method of the fracturing model sample of the coal-measure production layer group considering the transition zone of the present invention, it comprises the following steps in sequence:

[0031] Step 1: Place the sample mold on a horizontal surface; mix cement and quartz sand evenly according to a certain proportion, add water to the mixture and stir to form cement slurry; pour the cement slurry on the bottom layer of the sample mold to form coal Rock layer 1 of the production formation;

[0032] Step 2: Mix cement, quartz sand, and coal powder evenly according to a certain proportion, add water to the mixture and stir to form a coal-containing slurry; prepare ten parts of coal-containing slurry containing different proportions of coal powder, from small to large according to the proportion of coal powder The sequence is poured layer by layer in the middle layer of the sample mold, which forms the ...

Embodiment 2

[0042] According to another embodiment of the preparation method of the fracturing model sample of the coal-measure production layer group considering the transition zone of the present invention, its specific steps, preparation principle, beneficial effect, etc. are all the same as the first embodiment, the difference is:

[0043] The particle size of described quartz sand is 120 orders;

[0044] In step 1, the mass of water added to the cement slurry is 25% of the total mass of cement and quartz sand. The pouring height of the cement slurry in the sample mold is 50 mm.

[0045] In step 2, the volume ratios of cement, quartz sand, and coal powder in ten parts of coal-containing slurry are 1:1:0.15, 1:1:0.25, 1:1:0.45, 1 :1:0.8, 1:1:1.3, 1:1:1.8, 1:1:2.6, 1:1:3.4, 1:1:3.9, 1:1:4.25. The mass of water added to each portion of the coal-containing slurry is 20% of the total mass of cement, quartz sand, and coal powder in the portion of the coal-containing slurry. Coal-containi...

Embodiment 3

[0049] According to another embodiment of the preparation method of the fracturing model sample of the coal-measure production layer group considering the transition zone of the present invention, its specific steps, preparation principle, beneficial effect, etc. are all the same as the first embodiment, the difference is:

[0050] The particle size of described quartz sand is 100 orders;

[0051] In step 1, the mass of water added to the cement slurry is 20% of the total mass of cement and quartz sand. The pouring height of the cement slurry in the sample mold is 80 mm.

[0052] In step 2, the volume ratios of cement, quartz sand, and coal powder in ten parts of coal-containing slurry are 1:1:0.1, 1:1:0.2, 1:1:0.35, 1 :1:0.6, 1:1:1.0, 1:1:1.5, 1:1:2.2, 1:1:3.0, 1:1:3.6, 1:1:4.1. The mass of water added to each portion of the coal-containing slurry is 15% of the total mass of cement, quartz sand, and coal powder in the portion of the coal-containing slurry. Coal-containing ...

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Abstract

The invention relates to a preparation method of a coal-series reservoir group fracturing object model sample taking a transition zone into account. The preparation method includes the steps: uniformly mixing cement and quartz sand according to a certain proportion, adding water, stirring the cement, the quartz sand and the water to form cement slurry, and pouring the cement slurry to the bottom of a sample mould to form a rock layer of a coal-series reservoir group; uniformly mixing the cement, the quartz sand and pulverized coal according to a certain proportion, adding water, stirring the cement, the quartz sand, the pulverized coal and the water to form coal-bearing slurry, preparing at least ten parts of coal-bearing slurry containing different proportions of pulverized coal, pouringthe coal-bearing slurry to an intermediate layer of the sample mould layer by layer according to the sequence from small proportions of the pulverized coal to large proportions of the pulverized coalto form the transition zone of the coal-series reservoir group; uniformly mixing the cement, the quartz sand and the pulverized coal according to a certain proportion, adding water, stirring the cement, the quartz sand, the pulverized coal and the water to form coal-bearing slurry, pouring the coal-bearing slurry to the top of the sample mould and inserting a plurality of mutually perpendicular paraffin slices to form a coal and rock layer of the coal-series reservoir group. The mechanical property of the object model sample prepared by the method is infinitely close to that of the real coal-series reservoir group.

Description

technical field [0001] The invention belongs to the technical field of rock sample preparation, and in particular relates to a method for preparing a fracturing model sample of a coal-measure production layer group considering a transition zone. Background technique [0002] Coal series pay formations are gas-bearing formations in which unconventional reservoirs such as coal seams and tight sandstone formations are stacked vertically in multiple layers. They have the characteristics of shallow burial depth, many gas-bearing formations, low resource abundance, and poor permeability. Therefore, comprehensive exploration and development of unconventional natural gas resources in coal measures is an important way to protect natural gas resources and improve development benefits. At present, the joint development of multiple types of coal-measure gas reservoirs has attracted great attention at home and abroad, and pilot tests have been carried out in the Surat Basin of Australia ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28
CPCG01N1/28
Inventor 陈万钢王力侯冰郭小锋吴孝军
Owner CHINA UNITED COALBED METHANE
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