Bedding area hydrofracturing method by utilizing control of interception

A hydraulic fracturing and regional technology, which is applied in earth-moving drilling, wellbore/well components, mining equipment, etc., can solve the problems that the fracturing area cannot be completely penetrated, and the direction of fracture extension cannot be determined, so as to ensure the effect and effect. significant effect

Inactive Publication Date: 2018-02-09
CHONGQING UNIV
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Problems solved by technology

In recent years, many coal enterprises have carried out a variety of water control gas tests and achieved good results. Among them, hydraulic fracturing technology has the most significant anti-permeability effect. However, the current hydraulic fracturing technology still has the following problems: Downhole hydraulic fracturing Most of them are local fracturing, and the fracturing area cannot be completely penetrated; the direction of fracture extension during hydraulic fracturing cannot be determined

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  • Bedding area hydrofracturing method by utilizing control of interception
  • Bedding area hydrofracturing method by utilizing control of interception
  • Bedding area hydrofracturing method by utilizing control of interception

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Embodiment Construction

[0027] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] Such as Figure 1-3 As shown, a method of hydraulic fracturing in bedding area using interception control includes the following steps:

[0029] 1) Use conventional methods to test parameters such as in-situ stress, faults, porosity, permeability, water content, mechanical strength, mechanical strength and integrity of the roof and floor of the coal seam.

[0030] 2) Make fracturing holes in the selected fracturing coal seam. After the fracturing drilling is successfully constructed with a Φ75mm drill bit, use a Φ94mm drill bit to ream the hole to 0.5m from the top of the fracturing coal seam to ensure that the fracturing pipe can be sent to the designed fracturing layers.

[0031] 3) The opening of the fracturing drilling hole shall be sealed with a towel (cotton yarn), the length of which shall not be less than 1m, and the ...

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Abstract

The invention discloses a bedding area hydrofracturing method by utilizing control of interception. The bedding area hydrofracturing method mainly aims at coal beds which are low in hardness, high ingas content and low in gas permeability. Firstly a conventional method is adopted to conduct test on coal bed crustal stress, geological information and a fracture development situation, a fracturingarea is divided into four parts according to the test result and being centered on a fracturing hole, and the fracture development direction is monitored by utilizing inspection holes and a microearthquake technology. When fracturing fluid or a signal monitored by microearthquake happens on one inspection hole in the fracturing direction, fracturing operation is temporarily stopped, an interception hole is constructed and blockage is conducted at the position 30 cm away from the fracturing hole in the fracturing direction, after the interception hole is solidified, fracturing operation is continued, till the four parts are completely fractured. The bedding area hydrofracturing method solves the problem that the extension direction of the fracture in the hydrofracturing process cannot be clearly detected, the result is reliable, and the targets of fracturing and permeability improvement of a coal bed area can be achieved.

Description

technical field [0001] The invention relates to a construction technology of a bedding-based hydraulic fracturing method utilizing interception control, which is suitable for the bedding-based hydraulic fracturing work of underground coal seams in coal mines. Background technique [0002] The geological conditions of coal occurrence in my country are complex, and most of the coal seams have the characteristics of low hardness, high gas content, and low air permeability. Coal seam anti-permeability is a key technology to improve the effect of gas drainage, and water gas control is currently the most commonly used coal seam anti-permeability technology. In recent years, many coal enterprises have carried out a variety of water control gas tests and achieved good results. Among them, hydraulic fracturing technology has the most significant anti-permeability effect. However, the current hydraulic fracturing technology still has the following problems: Downhole hydraulic fracturin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00E21B43/26
CPCE21B43/261E21F7/00
Inventor 李全贵胡千庭梁运培裴文洲王晓光姜志忠张洋洋
Owner CHONGQING UNIV
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