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Method for verifying extension length of main crack of fracturing in coal bed methane wells

A technology for coalbed methane wells and verification methods, applied in earthwork drilling, wellbore/well components, production fluids, etc., to achieve the effect of data processing and model establishment optimization

Inactive Publication Date: 2020-04-28
SHANXI JINCHENG ANTHRACITE COAL MINING GRP CO LTD
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Problems solved by technology

[0003] In order to solve the problem of determining the exact length range of fracturing fractures in the process of coalbed methane exploration and exploitation, the present invention provides a method for verifying the extension length of fracturing main fractures in coalbed methane wells

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  • Method for verifying extension length of main crack of fracturing in coal bed methane wells

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Embodiment Construction

[0011] Such as figure 1 As shown, a method for verifying the extension length of main fractures in the fracturing of coalbed methane wells. Firstly, in combination with the project progress of the coal mine, the surface coalbed methane well 3 is laid out in advance. During the fracturing construction, the fracturing sand and fracturing hydraulic pressure will be injected into the coal seam after the fluorescent agent is transformed. During the fracturing process, the microseismic fracture monitoring technology was used on the ground to determine the approximate orientation of the main fracture 6, and then compared with the underground construction progress chart, the occurrence area and orientation of the main fractures were judged in advance, and the mining face that might be exposed soon was made. In the key monitoring area, an ultraviolet searchlight 5 for coal mine is arranged in front of the mining work, and the irradiation range is required to cover the working face. When...

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Abstract

The invention relates to the technical field of coal bed methane mining fracturing, in particular to a method for verifying an extension length of a main crack of fracturing in coal bed methane wells.The problem of determining an accurate length range of fracturing cracks in the exploration and mining processes of coal bed methane is solved. The method for verifying the extension length of the main crack of fracturing in the coal bed methane wells comprises the steps that first, by combining with the project progress of a coal mine, ground coal bed methane wells are laid in advance, fracturing sand and fracturing fluid after transformed by a fluorescer are pressed into coal beds during fracturing construction, in a fracturing process, a general position of the main crack is judged by utilizing a micro-seismic crack monitoring technology on the ground, ultraviolet searchlights for the coal mine are laid in front of a stope face, an irradiation range is required to cover a working face,bright color areas are displayed through irradiation, then data are collected, a precise influence length of the crack is obtained after calculation, and through comparative analysis of the data andground measurement data, error analysis can be conducted on the ground measurement data so as to improve the accuracy of the ground measurement data.

Description

technical field [0001] The invention relates to the technical field of fracturing in mining of coalbed methane, in particular to a method for verifying the extension length of main fractures in fracturing of coalbed methane wells. Background technique [0002] In coalbed methane exploration and exploitation, fracturing is one of the key technologies for coalbed methane extraction. Due to the particularity of the geological structure in the working area, the extension length of the main fracture after fracturing cannot be directly measured. Most of the fracture monitoring technology on the ground (microseismic, electrical method, etc.) is used to collect the signal data received during the fracturing process, and the data is processed through different models or formulas in the later stage. However, after a fracturing is completed, any detection method is a brief measurement. Therefore, different techniques will produce several different results. The recovery effect of coal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B43/267E21B43/00
CPCE21B43/006E21B43/267E21B49/00
Inventor 赵晋斌郝春生陈召英姚晋宝李军军王维
Owner SHANXI JINCHENG ANTHRACITE COAL MINING GRP CO LTD
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