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Method and device for controlling coal seam fracture expansion by alternate fracturing of water and cryogenic fluid

A low-temperature fluid, coal seam control technology, applied in the field of petroleum engineering fracturing, can solve problems such as poor fracturing effect and small reservoir stimulation range, and achieve improved oil recovery, increased coalbed methane migration channels, and improved reservoir stimulation. effect of effect

Active Publication Date: 2019-12-27
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

Due to the characteristics of soft coal rocks, large deformation, and well-developed natural fractures, hydraulic fractures are easy to expand along the natural fractures of the coal seam, and the formed hydraulic fractures are mainly concentrated near the wellbore, making it difficult to fracturing the distant coal seams. The fracturing range is small and the fracturing effect is poor, so there is no effective solution for this

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  • Method and device for controlling coal seam fracture expansion by alternate fracturing of water and cryogenic fluid
  • Method and device for controlling coal seam fracture expansion by alternate fracturing of water and cryogenic fluid
  • Method and device for controlling coal seam fracture expansion by alternate fracturing of water and cryogenic fluid

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Embodiment Construction

[0040] The technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of them. Based on the implementation manners in this application, all other implementation manners obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

[0041] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or a central element may also exist. When an element is considered to be "connected" to another element, it can be directly connected to the other element or an intermediate element may be present at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are f...

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Abstract

The invention provides a device and method for controlling coal bed crack propagation by water and cryogenic fluid alternate fracturing. The method includes steps: injecting water into a coal bed gaswell to form artificial cracks propagated along natural cracks through water injection fracturing in a first set area; then, injecting cryogenic fluid into the coal bed gas well to freeze water in a coal bed, wherein dispersed coal rock particles can be frozen together, and a main artificial crack spreading along a maximum main ground stress direction of the stratum is generated in the first set area; continuing water injection into the coal bed gas well to realize water injection fracturing in a second set area, injecting the cryogenic fluid into the coal bed gas well to enable forward spreading of the main artificial crack to penetrate the second set area; repeating the steps, subjecting an nth set area to water injection and cryogenic fluid injection fracturing to enable the main artificial crack to penetrate the nth set area. By water and cryogenic fluid alternate fracturing for segmental freezing of the coal bed, artificial crack trend control is realized, and accordingly reservoir reformation effects can be improved.

Description

Technical field [0001] The application belongs to the technical field of petroleum engineering fracturing, and particularly relates to a method and device for controlling coal seam crack propagation by alternate fracturing with water and low-temperature fluid. Background technique [0002] As a gas resource associated and symbiotic with coal, CBM is the main component of methane. In the process of coal mining, coalbed methane is the main harmful source that causes gas explosions and coal and gas outburst disasters in coal mines. As a kind of clean energy, the reasonable development and utilization of coalbed methane can not only improve the conditions for safe production in coal mines, but also protect the environment. At the same time, it is also of strategic significance to the adjustment of the national energy structure. my country's coal-bed methane resources are relatively abundant, and the reserves rank third in the world. The development and utilization of coal-bed methan...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26E21F7/00
CPCE21B43/26E21F7/00
Inventor 张广清郑学林吕延军
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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