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Device and method for evaluating temporarily freezing plugging properties of coalbed methane in process of fracturing

A coal seam and air pressure technology, which is applied in the field of freezing temporary plugging performance evaluation devices, can solve the problems of the lack of laboratory research methods on the mechanism of freezing temporary plugging and filtration loss reduction.

Inactive Publication Date: 2015-06-03
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide an experimental device for evaluating the performance of freezing temporary plugging in the process of coalbed gas fracturing in view of the lack of indoor research means for the freezing temporary plugging and filtration loss reduction mechanism in the process of low-temperature gas fracturing / assisted fracturing coalbed methane and method

Method used

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  • Device and method for evaluating temporarily freezing plugging properties of coalbed methane in process of fracturing
  • Device and method for evaluating temporarily freezing plugging properties of coalbed methane in process of fracturing
  • Device and method for evaluating temporarily freezing plugging properties of coalbed methane in process of fracturing

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Embodiment Construction

[0018] Attached figure 1 , To further describe the present invention.

[0019] Specific steps are as follows:

[0020] (1) Put the dry coal core into the core holder 8, and connect the equipment and pipelines according to the drawings. Initially, all valves are closed. (Be prepared)

[0021] (2) Open the valves 19, 23, 29, start the booster pump 2, inject distilled water through the intermediate container 3, and apply the confining pressure to the core holder to P s (8MPa), then close valves 19, 23, 29. (Add confining pressure to the core holder)

[0022] (3) Open the valve 34, start the vacuum pump 11, and connect the high-pressure small gas cylinder 7 (V btl =5ml) Vacuum for 1-2 hours, then stop the vacuum pump 11 and close the valve 34. (Evacuate high-pressure small gas cylinders)

[0023] (4) Open the valves 20, 24, 27, 33, start the booster pump 2, and inject high-pressure N2 into the high-pressure small gas cylinder 7 through the intermediate container 4 to P 1 (6MPa), then cl...

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Abstract

The invention relates to the field of petroleum and gas development, and provides a device and a method for evaluating the temporarily freezing plugging properties of coalbed methane in the process of fracturing, which is designed for solving the problem that indoor research approaches are leaked in the implementation of temporarily freezing plugging de-filtration mechanisms in the process that low-temperature gas fractures / helps to fracture coalbed methane. An experimental device comprises a booster pump, a middle container set, a high-pressure small container bottle, a core holder, a vacuum pump, a constant-temperature box, a pressure sensor, a temperature sensor, a data acquisition box and a control computer, and the like. Through the device and method disclosed by the invention, the plugging capacity of freezing or formed hydrates in a low-temperature environment to a coal seam and the influence of freezing or hydrate dissolving to the plugging capacity of the coal seam can be simulated, and therefore, the device and the method disclosed by the invention have great significance on the evaluation on the temporarily freezing and leakage plugging properties in the process that low-temperature gas fractures / helps to fracture coalbed methane.

Description

Technical field [0001] The invention relates to the field of oil and natural gas development, in particular to a freezing temporary plugging performance evaluation device and method in the process of low-temperature gas fracturing / assisted fracturing of coalbed methane. Background technique [0002] Hydraulic fracturing is the main measure to increase CBM production. At present, the commonly used active water fracturing has serious fracturing fluid loss, low flowback rate, short and complicated fracturing fractures, etc. The use of new fracturing fluid and effective temporary plugging technology is the key to improving the fracturing effect. Utilize liquid nitrogen / liquid CO 2 Fracturing / assisted fracturing of coalbed methane has the advantages of increasing energy and assisting drainage, reducing fluid loss, and less damage to the formation. In the 1990s, in the fracturing of new shale gas wells in North America and repeated fracturing of old CBM wells, Liquid nitrogen was used ...

Claims

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Application Information

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IPC IPC(8): G01N7/10
Inventor 张亮崔国栋李欣任建华任韶然
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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