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A mine-used multifunctional modular carbon dioxide foam fracturing test method

A carbon dioxide and fracturing test technology, which is applied in earthwork drilling, wellbore/well components, instruments, etc., can solve problems such as failure to achieve the drainage effect, and achieve the effect of practical function, low cost and simple structure

Active Publication Date: 2020-03-31
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For low-permeability coal seams, when the conventional drilling arrangement and parameters are used to pre-drain coal seam gas, the required drainage effect is often not achieved

Method used

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  • A mine-used multifunctional modular carbon dioxide foam fracturing test method
  • A mine-used multifunctional modular carbon dioxide foam fracturing test method
  • A mine-used multifunctional modular carbon dioxide foam fracturing test method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Such as Figure 1 to Figure 4 As shown, in order to cover the foam liquid property investigation stage, proppant effect investigation stage and foam hydraulic fracturing effect investigation stage of carbon dioxide foam fracturing coal seam enhancement, it is necessary to conduct in-depth research on the formulation improvement, performance inspection and support of carbon dioxide foam liquid suitable for coal mines. The selection of the agent and the effect of the carbon dioxide foam fracturing fluid on the permeability enhancement of the coal seam. In the first embodiment, the constant temperature and high pressure foam liquid property test module 3, the coal seam fracturing simulation module 5 and the proppant mixing module 6 are all added to the test system. The specific connection structure is as follows:

[0032] The gas outlet of the gas source station 1 communicates with the inlet of the booster pump 2, which is a pneumatic piston type booster pump, the liquid o...

Embodiment 2

[0043] Such as Figure 5 As shown, in order to study the simulation function of coal seam fracturing without proppant carbon dioxide foam, in the second embodiment, two booster pumps 2 are used to pressurize liquid carbon dioxide and fracturing fluid respectively, and then pass them into the coal seam fracturing simulation module 5, which is intuitive Observe the test process of proppant-free carbon dioxide foam coal seam fracturing. The specific connection structure is as follows:

[0044] There are two gas source stations 1 and two booster pumps 2 respectively, the outlet of one gas source station 1 communicates with the inlet of one of the booster pumps 2, and the outlet of the other gas source station 1 communicates with the other The air inlet of one booster pump 2 is connected, the liquid outlets of the liquid carbon dioxide storage tank 41 and the fracturing fluid storage tank 42 are respectively connected with the liquid inlets of the two booster pumps 2, and the liqui...

Embodiment 3

[0049] Such as Figure 6 As shown, in order to study the fracturing simulation function of carbon dioxide foam coal seam with proppant, in the third embodiment, two booster pumps 2 are used to pressurize the liquid carbon dioxide and fracturing fluid respectively, and then pass them into the coal seam through the proppant mixing module 6 for fracturing. In the fracture simulation module 5, the test process of carbon dioxide foam coal seam fracturing with proppant was visually observed. The specific connection structure is as follows:

[0050] There are two gas source stations 1 and two booster pumps 2 respectively, the outlet of one gas source station 1 communicates with the inlet of one of the booster pumps 2, and the outlet of the other gas source station 1 communicates with the other The air inlet of one booster pump 2 is connected, the liquid outlets of the liquid carbon dioxide storage tank 41 and the fracturing fluid storage tank 42 are respectively connected with the li...

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Abstract

The invention relates to a fracturing test method of multifunctional modular carbon dioxide foam for mines, and belongs to the technical field of coal seam fracturing simulation test methods in orderto solve the technical problems of property test and fracturing simulation of a fracturing fluid. The method sequentially comprises the following steps: 1, starting a gas source station, and introducing a driving gas to a booster pump; 2, mixing high-pressure liquid carbon dioxide with a high-pressure fracturing fluid, and pressing the obtained mixture in a constant-temperature and high-pressure foam liquid property test module; 3, pressing the obtained high-pressure carbon dioxide foam fracturing liquid in a propping agent mixing module after the constant-temperature and high-pressure foam liquid property test, and fully mixing the high-pressure carbon dioxide foam fracturing fluid with a propping agent in the propping agent mixing module; and 4, pressing the obtained propping agent-containing high-pressure carbon dioxide foam fracturing fluid in a coal seam fracturing simulation module through a pipeline. The method is of great significance to deeply study the formula improvement andperformance investigation of a carbon dioxide foam liquid suitable for mines, the selection of the propping agent and the permeation improvement effect of the carbon dioxide foam fracturing fluid onthe coal seam.

Description

technical field [0001] The invention belongs to the technical field of coal seam fracturing simulation test methods, and in particular relates to a mine-used multifunctional modular carbon dioxide foam fracturing test method, a modular test system and a test device thereof. Background technique [0002] At present, gas accidents are still the main accidents among major accidents in coal mines. Therefore, gas control is the primary task of current coal mine safety work. Underground gas extraction in the coal seam itself will prevent gas accidents and ensure safe production in mines. Particularly important. [0003] For low-permeability coal seams, the required drainage effect is often not achieved when the conventional drilling arrangement and parameters are used to pre-drain coal seam gas. For this reason, it is necessary to adopt the method of intensified gas extraction, to artificially communicate the original fracture network in the coal seam or to generate a new fractur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/00E21B43/26E21B43/267
CPCE21B43/26E21B43/267G01N33/00
Inventor 王俊峰周春山唐一博刘硕
Owner TAIYUAN UNIV OF TECH