Coal bed gas fracturing method suitable for multiple sets of high-steep crushed coal beds

A coal seam and fracturing technology, which is applied in the field of hydraulic fracturing stimulation of coalbed methane, can solve the problems of lack of optimal layers and reasonable fracturing scales, and maximize the utilization of coalbed methane resources and economic benefits, and improve economic efficiency. Benefit, the effect of reducing the cost of fracturing

Active Publication Date: 2021-08-10
CHONGQING INST OF GEOLOGY & MINERAL RESOURCES
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Problems solved by technology

In addition to the above-mentioned patents, there are many literatures describing the hydraulic fracturing method of coal seams, but there is no method for determining the optimal seam and reasonable fracturing scale for fine-grained coal, multi-coal seams, and high-steep coal seams

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  • Coal bed gas fracturing method suitable for multiple sets of high-steep crushed coal beds

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Embodiment Construction

[0036] In order to have a clearer understanding of the technical features, purposes and beneficial effects of the present invention, the technical solution of the present invention will be described in detail below in conjunction with the following specific examples, but it should not be construed as limiting the scope of the present invention.

[0037] The fracturing method of the present invention is designed for granular coal with many coal seams and high inclination angle, and multi-layer coal seams and rocks are alternately formed. The method includes multiple steps such as coal preparation seam, coal preparation section, fracturing scale determination, fracturing material selection, perforation, pump injection, etc., and configures a reasonable fracturing scheme by optimizing the coal preparation seam and coal preparation section. It solves the problem that high and steep coal seam is easy to produce sand, and the cracks formed are too long, but cannot be effectively supp...

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Abstract

The invention belongs to the field of coal bed gas reservoir fracturing transformation and yield increase, and relates to a coal bed gas fracturing method suitable for multiple sets of high-steep crushed coal beds. The coal bed gas fracturing method mainly comprises the steps of coal bed fracturing, fracturing section number determination, fracturing scheme determination and the like. By accurately selecting the layer and abandoning an uneconomically developed coal bed, coal bed gas resource utilization and economic benefit optimization and maximization are realized. The problems that the high-steep coal bed is prone to sand production, a formed crack is too long, but effective supporting cannot be achieved, and fracturing resources are wasted are solved, the fracturing transformation cost is reduced, and the economic benefits of coal bed gas development are improved.

Description

technical field [0001] The invention relates to the field of coal bed gas hydraulic fracturing reconstruction and production increase, in particular to a coal bed gas fracturing method suitable for multiple sets of high steep and broken coal seams. Background technique [0002] As an unconventional oil and gas resource, coalbed methane has occupied an important position in my country's natural gas production. Since most coal seams in my country are low-porosity and low-permeability coal seams, reservoir transformation is required to obtain industrial or economic development value. Hydraulic fracturing technology is the main technology to realize the permeability enhancement of coal seam, and it is widely used in the development of coal bed methane. The burial geological conditions of coalbed methane in different regions of my country are diverse. Southwest China has the characteristics of many coal seams, high gas content, thin coal seams, and low permeability. Especially ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/267E21B49/00E21B47/00C09K8/66C09K8/80
CPCE21B43/267E21B49/00E21B47/00C09K8/665C09K8/66C09K8/80
Inventor 贺培邓智程礼军张烨陆朝晖张健强黄永葵张义
Owner CHONGQING INST OF GEOLOGY & MINERAL RESOURCES
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