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Device and method for controlling coal bed crack propagation by water and cryogenic fluid alternate fracturing

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

Active Publication Date: 2019-01-22
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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  • Device and method for controlling coal bed crack propagation by water and cryogenic fluid alternate fracturing
  • Device and method for controlling coal bed crack propagation by water and cryogenic fluid alternate fracturing
  • Device and method for controlling coal bed crack propagation by water and cryogenic fluid alternate fracturing

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[0040] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the accompanying drawings in the embodiments of the application. Apparently, the described embodiments are only part of the embodiments of the application, not all of them. Based on the implementation manners in this application, all other implementation manners obtained by persons of ordinary skill in the art without creative efforts fall within the scope of protection 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 there may also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for purpos...

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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 in particular relates to a method and device for controlling the expansion of coal seam cracks through alternate fracturing of water and low-temperature fluid. Background technique [0002] Coalbed methane is a gas resource associated with coal, and its main component is methane. In the process of coal mining, coalbed methane is the main harmful source of gas explosions and coal and gas outburst accidents in coal mines. As a kind of clean energy, the rational development and utilization of coalbed methane can not only improve the conditions of safe production in coal mines, but also protect the environment. At the same time, it also has strategic significance for the adjustment of the national energy structure. my country's coalbed methane resources are relatively rich, and its reserves rank third in the world. The development and utilization of coalbed methane has...

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Application Information

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Patent Type & Authority Applications(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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