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Preparation method of fracturing physical model sample of coal-bearing production layer group

A technology of coal production layer and physical model, which is applied in the preparation of test samples, etc., can solve the problems of inability to effectively simulate the properties of natural fractures and the inability to accurately simulate the difference in physical properties between layered samples, and achieve a reduction in borehole wall The risk of instability, the prevention of coal rock being crushed, and the effect of ensuring uniform loading

Active Publication Date: 2018-07-17
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method of using concrete samples to simulate layered samples cannot effectively simulate the properties of natural fractures developed in rock formations, such as coal seam cleats or shale bedding, let alone accurately simulate the interlayer physical property differences of layered samples

Method used

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  • Preparation method of fracturing physical model sample of coal-bearing production layer group
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  • Preparation method of fracturing physical model sample of coal-bearing production layer group

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Experimental program
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Embodiment 1

[0037] Such as figure 1 As shown, according to an embodiment of the preparation method of the coal-bearing formation group fracturing model sample of the present invention, it comprises the following steps in order:

[0038] Step 1: Analyze the characteristics of the coal-bearing formations to be simulated, select the coal and rocks for the preparation of phantom samples, and according to the lithological characteristics of each rock sample in the actual coal-bearing formations, extract the outcropped coal and rocks Processed into cuboid thin plates of the same size;

[0039] Step 2: Drilling a simulated wellbore 3 on the rock sheet 1, and cementing the simulated wellbore 4 in the simulated wellbore 3;

[0040] Step 3: taking the rock sheet 1 cemented with the simulated shaft 4 as the middle layer, and respectively cementing the coal and rock sheets 2 on both sides of the rock sheet 1 to form a coal-bearing production layer combination;

[0041] Step 4: Select the wrapping l...

Embodiment 2

[0051] According to another embodiment of the preparation method of the coal-bearing formation group fracturing model sample of the present invention, its preparation steps, principle and beneficial effect etc. are all the same as Embodiment 1, the difference is:

[0052] Natural coal outcrops and natural sandstone outcrops in the Linxing area on the eastern margin of the Ordos Basin, China were selected to prepare coal-sandstone-coal composite fracturing phantom samples. The diameter of the simulated wellbore is 20mm and the length is 170mm; the inner diameter of the simulated wellbore is 6mm, the outer diameter is 16mm, and the length is 190mm; the open hole section reserved at the lower end of the simulated wellbore is 40mm, and the simulated wellbore The uncemented simulated wellbore reserved at the upper end of the eye is 60mm. The simulated wellbore was cemented in the simulated wellbore with AB silica gel, and the cementing time was 9 hours. Use AB silica gel to glue t...

Embodiment 3

[0054] According to another embodiment of the preparation method of the coal-bearing formation group fracturing model sample of the present invention, its preparation steps, principle and beneficial effect etc. are all the same as Embodiment 1, the difference is:

[0055] The natural coal outcrops and natural limestone outcrops in the Linxing area on the eastern margin of the Ordos Basin, China were selected to prepare coal rock-limestone-coal rock composite fracturing phantom samples. The diameter of the simulated wellbore is 20mm, and the length is 180mm; the inner diameter of the simulated wellbore is 6mm, the outer diameter is 16mm, and the length is 200mm; The uncemented simulated wellbore reserved at the upper end of the eye is 70mm. The simulated wellbore was cemented in the simulated wellbore with AB silica gel, and the cementing time was 10 hours. Use AB silica gel to glue the coal rock sheet to the wide surfaces on both sides of the rock sheet, and the bonding time ...

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Abstract

The invention relates to a manufacturing method of coal-bearing production layer set fracturing physical modeling samples. The method successively comprises the following steps of analyzing features of a coal-bearing production layer set needing to be simulated, selecting coal and rock for preparing the physical modeling samples, and processing the exposed coal and rock into cubic sheets of the same size according to the lithologic features of the samples in the coal-bearing production layer set; drilling simulation well holes in the rock sheets, and fixedly sticking simulation well shafts into the simulation well holes; using the rock sheets to which the simulation well shafts are fixedly stuck as a middle layer, and fixedly sticking coal sheets to the two sides of the rock sheets to form a coal-bearing production layer assembly; selecting a wrapping layer for conducting external pouring on the coal-bearing production layer assembly to form the coal-bearing production layer set fracturing physical modeling samples. The preparation method can simulate layering samples of different lithologic assemblies of the coal-bearing production layer set, and compared with artificial layering samples, coal and rock cleating, natural crack, hydraulic crack and other rock physical properties of a true storage layer can be more accurately simulated.

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-bearing production layer group. Background technique [0002] Coal-bearing coal-measure coal-bed methane, tight gas and shale gas are widely distributed in my country's coal-bed methane fields, mainly in the Ordos Basin, with abundant gas volume and huge development potential. Due to the large thickness variation and many layers of the coal seam, the shale gas, tight gas and coalbed methane developed between the layers have the characteristics of continuous accumulation and coexistence in the area, which cannot meet the conditions of mechanical layer fracturing, so it is difficult to mine independently CBM. The "Thirteenth Five-Year Plan" proposes the combined exploitation of coalbed methane and surrounding shale gas and tight gas, that is, the combined production of three gases, the implement...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28
Inventor 侯冰谭鹏陈勉金衍卢运虎林伯韬郭小锋
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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