Fractured soft low-permeability coal seam roof or floor staged fracturing horizontal well coal bed gas extraction method

A coal seam roof and staged fracturing technology, which is applied in the fields of mining fluids, mining equipment, earthwork drilling, etc. Effect

Active Publication Date: 2021-06-18
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects and deficiencies in the prior art, the present invention provides a coalbed methane extraction method in a fractured, soft and low-permeability coal seam roof or floor seg

Method used

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  • Fractured soft low-permeability coal seam roof or floor staged fracturing horizontal well coal bed gas extraction method
  • Fractured soft low-permeability coal seam roof or floor staged fracturing horizontal well coal bed gas extraction method
  • Fractured soft low-permeability coal seam roof or floor staged fracturing horizontal well coal bed gas extraction method

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Example Embodiment

[0184] Step 8.3, in accordance with the requirements of the mining design specification, install the horizontal well-exhausted equipment, and the horizontal wells are subjected to mining operations. Example 1

[0185] According to the above technical solution, in the present embodiment, the target mining area is a mining area of ​​Huaibei. The mine area is a typical high gas protruding mine in my country. The geological structure is complex. The gas disaster is serious, and there have been several gas outstanding and explosion accidents. Therefore, It is necessary to carry out gas pre-pumping before coal mining. Usually underground is routinely in the bottom plate rock lane, drilling or coal lanes, the coal-lamination level drilling, due to the soft and low seepage of the coal seam, the single hole gas extraction is low, the extraction is long, and the contradiction between the mining replacement is very highlight. In the early days, the vertical fracturing straight well was used ...

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Abstract

The invention discloses a fractured soft low-permeability coal seam roof or floor staged fracturing horizontal well coal bed gas extraction method. The method comprises the steps of determining the well type of a horizontal well according to exploration data and mine data; determining the well position of the horizontal well according to the exploration data and the mine data; according to the exploration data and the mine data, determining a target layer position of a horizontal section of the horizontal well on a coal seam roof or floor and a vertical distance between the horizontal section of the horizontal well and the top/bottom surface of coal seam; determining a layout azimuth angle of the horizontal section of the horizontal well according to the minimum horizontal principal stress direction of a target mining area; finishing drilling of a vertical well section; performing geosteering drilling of the horizontal section of the horizontal well through an orientation gamma geosteering method, and adjusting a drilling track of the horizontal section of the horizontal well in real time; performing segmented packing on the horizontal section of the horizontal well, performing oriented perforating or multi-cluster oriented perforating in the coal seam direction, and performing multi-cluster temporary plugging steering staged fracturing construction; and after the multi-cluster temporary plugging steering staged fracturing construction is completed, performing flowback, well flushing and coal bed gas drainage and recovery.

Description

technical field [0001] The invention belongs to the technical field of coal bed gas extraction, and in particular relates to a method for extracting coal bed gas from a horizontal well with staged fracturing on the top or bottom plate of a broken soft low-permeability coal seam. Background technique [0002] CBM is mainly stored in coal seams in the form of adsorption. During the extraction process of coalbed methane, the gas adsorbed in the coal seam is desorbed and converted into free gas, and then migrates to the coalbed methane well through micropore diffusion and fracture seepage in the coal seam, thereby realizing the extraction of coalbed methane. Fragile soft and low permeability coal seams have the characteristics of low porosity, low permeability, and crushed and soft coal seams. They are widely distributed in Carboniferous-Permian coal seams in my country, but the extraction efficiency of coalbed methane is low. At present, the gas production rate of commonly use...

Claims

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Application Information

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IPC IPC(8): E21B43/267E21B43/30E21F7/00
CPCE21B47/022Y02A90/30
Inventor 张群姜在炳李彬刚许耀波王成周佳佳李浩哲陈刚降文萍杜新锋张培河刘柏根舒建生范耀刘嘉赵龙庞涛刘磊
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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