Fracturing method of coal bed gas in smashed pea coal

A technology for crushed coal and coal seams, which is applied in the field of coalbed methane exploration and development fracturing engineering, can solve the problems of rational damage to the coal body structure of the crushed coal, failure to achieve good transformation results, waste of power for fracturing equipment, etc., and achieve reduction The effect of reducing construction risk, reducing formation filtration loss, and enhancing transformation effect

Inactive Publication Date: 2017-06-20
重庆矿产资源开发有限公司
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AI Technical Summary

Problems solved by technology

[0003] 2. The bedding rationality of the coal body structure of the crushed coal has been severely damaged, the structure, structure, composition, and endogenous fractures of the coal seam have all changed, the fractures in the seam are interlaced, the coal seam is loose as a whole, and there is a large amount of coal powder. difficulty
[0005] 4. In actual construction cases, conventional hydraulic fracturing methods failed to achieve good transformation results in the transformation of crushed coal
The main manifestations are: high fracturing construction pressure, wasting power of fracturing equipment; loose coal seams, severe liquid filtration and low efficiency; limited extension range of fractures; risk of sand plugging during construction; fractures are easy to close after fracturing, etc.

Method used

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Effect test

Embodiment 2

[0034] A coal bed gas fracturing method for crushed coal, comprising the following steps:

[0035] (1) Optimizing perforation parameters: choose lump coal and fragmented coal with relatively stable coal structure for the perforation position, and establish a liquid inlet channel in the stable coal seam section. Specifically, 102 guns are used, and the perforation density is 16 holes / m. Angle 60°;

[0036] (2) Optimizing the pump injection procedure: In the whole fracturing process, according to the role of the fracturing fluid in different stages, they are respectively named pre-fluid, sand-carrying fluid and displacement fluid;

[0037] (1) Increase the ratio of the amount of pre-fluid, the amount of pre-fluid is increased to 45-55% of the total amount of fracturing fluid. Pump the pre-fluid plus sand slug, and the pre-fluid plus sand slug reduces friction and fluid loss. The specific steps are: after pumping 1 wellbore volume of pure fracturing fluid, then pump 1 wellbore v...

Embodiment 3

[0045] A coal bed gas fracturing method for crushed coal, comprising the following steps:

[0046] (1) Optimizing perforation parameters: choose lump coal and fragmented coal with relatively stable coal structure for the perforation position, and establish a liquid inlet channel in the stable coal seam section. Specifically, 89 guns are used, and the perforation density is 16 holes / m. Angle 60°;

[0047] (2) Optimizing the pump injection procedure: In the whole fracturing process, according to the role of the fracturing fluid in different stages, they are respectively named pre-fluid, sand-carrying fluid and displacement fluid;

[0048](1) Increase the ratio of the amount of pre-fluid, the amount of pre-fluid is increased to 45-55% of the total amount of fracturing fluid. Pump the pre-fluid plus sand slug, and the pre-fluid plus sand slug reduces friction and fluid loss. The specific steps are: after pumping 1 wellbore volume of pure fracturing fluid, then pump 1 wellbore vol...

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Abstract

The invention provides a fracturing method of coal bed gas in smashed pea coal. Perforation parameters are optimized, and a liquid inlet channel is established in a stable coal seam section; in the whole fracturing process, the using proportion of pre-liquid volume is increased, and the pre-liquid volume is increased to 45-55% of total fracturing fluid; firstly, pure fracturing fluid accounting for 20-25% of the total fracturing fluid is pumped; then prepad fluid is pumped and a sand slug is added; sand-carrying fluid and the added sand slug support fractures and prevent sand blocking; and at last, displacing liquid is pumped. According to the fracturing method of the coal bed gas in the smashed pea coal, fracturing modification of the coal bed gas in the smashed pea coal can be effectively guided through the methods of optimizing the perforation parameters, optimizing the pumping procedure and the like.

Description

technical field [0001] The invention relates to the technical field of fracturing engineering for coalbed methane exploration and development, in particular to a coalbed gas fracturing method for finely divided coal. Background technique [0002] 1. Fracturing is an important measure for increasing the production of coalbed methane reservoirs. For the structural fragmentary coal whose original structure is damaged by stress, it can be effectively developed only through targeted fracturing. [0003] 2. The bedding rationality of the coal body structure of the crushed coal has been severely damaged, and the structure, structure, composition, and endogenous fractures of the coal seam have all changed. difficulty. [0004] 3. The existing method of reforming fine-grained coal mainly adopts conventional sandstone gas reservoir fracturing technology, that is, after the coal seam section is perforated, high-pressure liquid and proppant are pumped into the coal seam to obtain the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/267E21B43/119
CPCE21B43/26E21B43/119E21B43/267
Inventor 姚光华王晓泉董卫军廖金华邓洪军宜伟谭秀华熊鑫张宇
Owner 重庆矿产资源开发有限公司
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