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Underground high-pressure hydraulic fracturing hole sealing material for coal mine and hole sealing technology

A technology of hydraulic fracturing and sealing materials, which is applied in the direction of sealing/isolation, wellbore/well components, drilling compositions, etc., which can solve the problems of thin slurry, large shrinkage, and insufficient sealing depth, etc., and achieve reduction Water loss, improving toughness and impact resistance, and the effect of sealing depth

Active Publication Date: 2014-11-12
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention also relates to a hole sealing process, which solves the problems of replacement grouting, thin grout, large shrinkage, and insufficient sealing depth.

Method used

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  • Underground high-pressure hydraulic fracturing hole sealing material for coal mine and hole sealing technology
  • Underground high-pressure hydraulic fracturing hole sealing material for coal mine and hole sealing technology
  • Underground high-pressure hydraulic fracturing hole sealing material for coal mine and hole sealing technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: The components of the sealing material are: 100 parts of cement, 60 parts of water, 2 to 4 parts of early strength superplasticizer, and 0.08 to 0.5 parts of polypropylene fiber (volume content of 0.1 to 0.6%).

[0023] Table 1 Experimental data of sealing material ratio

[0024]

Embodiment 2

[0025] Example 2: The components of the sealing material are: 100 parts of cement, 60 parts of water, 3 parts of early-strength superplasticizer, and 0.08-0.5 parts of polypropylene fiber (volume dosage 0.1-0.6%).

[0026] It can be seen from the 18th group of data in Table 2 that when the dosage of early strength superplasticizer is 3% and the volume dosage of polypropylene fiber is 0.6%, the strength is the largest and the shrinkage is the smallest.

[0027] Table 2 Experimental data of the optimal ratio of sealing materials

[0028]

[0029] In the above plan, the polypropylene fiber is an inert material. It is compatible with the Ms early-strength superplasticizer and has good compatibility without affecting other properties of the slurry. The Ms early-strength superplasticizer is directly added to the mixing water, and the polypropylene fiber Dry mix with cement first, mix evenly, then add water to make it evenly distributed in the slurry, and will not block pipelines ...

Embodiment

[0031] Embodiment: sealing process, as figure 1 shown, including the steps in the following order:

[0032] a Drill a hole with a diameter of 75mm on the coal rock mass, construct it to the top of the coal seam, and ream the hole to the bottom of the coal seam with a drill bit with a diameter of Φ94mm.

[0033] b. Send the fracturing pipe 1 to the roof of the coal seam at the bottom of the borehole. The front part of the fracturing pipe 1 is the screen 6, and the screen 6 is wrapped with gauze with a length of 50-100 cm to prevent the backflow of the sealing slurry from blocking the fracturing pipe; The lower end of the pipe 6 wraps and binds cotton yarn to form a cotton yarn plug 11, which is used to plug the hole section at the junction of the coal seam floor and the coal-rock mass, and plays the role of blocking the sealing slurry 10 and filtering water. The split pipe 1 is connected and put into the borehole until it reaches the bottom of the borehole. Send the grouting ...

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Abstract

The invention provides an underground high-pressure hydraulic fracturing hole sealing material for a coal mine and a hole sealing technology. The hole sealing material comprises the following components by weight: 100 parts of cement, 2 to 4 parts of Ms type early-strength slushing agent, 0.08 to 0.5 parts of polypropylene fiber, and 60 parts of water. The hole sealing technology comprises the following steps in sequence: drilling a hole on a coal-rock mass; constructing until reaching the a top plate at a coal seam; expanding the hole to a bottom plate at the coal seam; feeding a grouting pipe to the bottom plate at the coal seam; arranging a grout returning pipe to the front end of a blocking section of a hole port; blocking the hole port section through AB adhesive and cotton yarn; feeding the hole sealing material into the hole through the grouting pipe; closing a check valve of the grout returning pipe after returning the grout through the grout returning pipe; continuously grouting; completely draining the grout in the grouting pipe once water flows form a fracturing hole; grouting at the second time after the grout is condensed; and finally solidifying. The underground high-pressure hydraulic fracturing hole sealing material for the coal mine has the advantages of being less in contraction, and high in compressive strength and impact toughness; the hole sealing material is high in sealing performance and resistance to high pressure under the effect of high-pressure hydraulic fracturing impact load; simultaneously, the hole sealing material is low in cost and the construction is convenient; and the hole sealing technology is simple, the hole sealing depth meets the requirement, and the success rate is high.

Description

technical field [0001] The invention relates to a hole-sealing material and a hole-sealing process for high-pressure hydraulic fracturing in underground coal mines. Background technique [0002] Gas disaster is the first factor that restricts coal mine safety and efficient production, and pre-drilling is an effective measure for gas control and outburst prevention. Most of the coal seams in my country's coal mines are soft and low-permeability coal seams. In the process of drilling and drainage, gas drainage is difficult due to the low permeability of coal seams. How to increase the gas permeability coefficient of the original coal body, ensure that the drainage can be achieved quickly and better, prevent the occurrence of coal and gas outburst accidents, and meet the needs of mine safety and efficiency. It is particularly important to adopt targeted comprehensive gas control technology scientifically and rationally. . [0003] Hydraulic fracturing is a conventional proces...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/467E21B33/13
Inventor 葛兆龙卢义玉梅绪东孙大发陈久福夏彬伟程亮丁红
Owner CHONGQING UNIV
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