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Compound surfactant for modifying low-permeability coal reservoir and modifying method of low-permeability coal reservoir

A surfactant, low-permeability technology, used in earth-moving drilling, safety devices, mining equipment, etc., can solve the problems of long reaction time and incomplete reaction of a single surfactant, and achieve short reaction time and fast reaction rate. Effect

Inactive Publication Date: 2018-08-03
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the defect of the single surfactant in the above-mentioned prior art, the object of the present invention is to provide a kind of compound surfactant of modified low-permeability coal reservoir and modification method thereof, adopt this modified low-permeability coal reservoir Modified low-permeability coal reservoirs with compound surfactants, solving the defects of long reaction time and incomplete reaction of single surfactants

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] A compound surfactant for modifying low-permeability coal reservoirs is a non-ionic-ionic surfactant mixed system, specifically including sodium lauryl sulfate (C 12 h 25 SO 4 Na), polyoxyethylene lauryl ether and water;

[0074] Wherein, the mass percent of each component is: sodium lauryl sulfate is 0.3wt.%, lauryl alcohol polyoxyethylene ether is 0.3wt.%, and the balance is water;

[0075] A method for modifying a compounded surfactant for modifying a low-permeability coal reservoir, comprising the following steps:

[0076] Step 1, making and screening standard coal samples

[0077] The coal core is taken on the coal block with a rock coring machine. In order to ensure the uniformity of the coal sample, the coal samples of each group are drilled on the same coal block as much as possible, and the coal core is cut into sizes of The coal pillars are screened by a non-metallic ultrasonic detector, and the standard coal samples with a longitudinal wave velocity in t...

Embodiment 2

[0116] A compound surfactant for modifying low-permeability coal reservoirs is a positive-negative ion surfactant mixed system, specifically including sodium lauryl sulfate (C 12 h 25 SO 4 Na), dodecyltrimethylammonium bromide (C 15 h 34 N Br) and water;

[0117] Wherein, the mass percent of each component is: lauryl sodium sulfate is 0.1wt.%, dodecyltrimethylammonium bromide (C 15 h 34 N Br) is 0.1wt.%, and the balance is water;

[0118] A method for modifying a compounded surfactant for modifying a low-permeability coal reservoir, comprising the following steps:

[0119] Step 1, making and screening standard coal samples

[0120] The coal core is taken on the coal block with a rock coring machine. In order to ensure the uniformity of the coal sample, the coal samples of each group are drilled on the same coal block as much as possible, and the coal core is cut into sizes of The coal pillars are screened by a non-metallic ultrasonic detector, and the standard coal sa...

Embodiment 3

[0159] A compound surfactant for modifying low-permeability coal reservoirs is a long-chain polar organic matter-ionic surfactant mixed system, specifically including sodium lauryl sulfate (C 12 h 25 SO 4 Na), n-octanol and water;

[0160] Wherein, the mass percent of each component is: sodium lauryl sulfate is 0.2wt.%, n-octanol is 0.2wt.%, and the balance is water;

[0161] A method for modifying a compounded surfactant for modifying a low-permeability coal reservoir, comprising the following steps:

[0162] Step 1, making and screening standard coal samples

[0163] The coal core is taken on the coal block with a rock coring machine. In order to ensure the uniformity of the coal sample, the coal samples of each group are drilled on the same coal block as much as possible, and the coal core is cut into sizes of The coal pillars are screened by a non-metallic ultrasonic detector, and the standard coal samples with a longitudinal wave velocity in the range of 2-2.5km / s ar...

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Abstract

The invention discloses a compound surfactant for modifying a low-permeability coal reservoir and a modifying method of the low-permeability coal reservoir, and belongs to the technical field of coalmining. The compound surfactant for modifying the low-permeability coal reservoir comprises the components of, by mass, 0.1-0.3% of fatty alcohol sodium sulfate, 0.1-0.3% of compound components, and the balance water. The compound components comprise a nonionic surfactant, a positive ion surfactant or a long chain polar organic matter. The modifying method of the low-permeability coal reservoir comprises the steps that a standard coal sample is manufactured and screened; the compound surfactant for modifying the low-permeability coal reservoir is prepared; the standard coal sample is soaked, after the standard coal sample is saturated, the initial porosity is calculated, soaking is conducted for 6-18 h at the temperature of 25-40 DEG C, and the mass loss rate and the porosity are calculated, and a static water wetting angle experiment is conducted. The compound surfactant for modifying the low-permeability coal reservoir is adopted to modify the low-permeability coal reservoir, and thedefects that a single surfactant is long in reaction time and incomplete in reaction are solved.

Description

technical field [0001] The invention belongs to the technical field of coal mining, and in particular relates to a compound surfactant for modifying low-permeability coal reservoirs and a modification method thereof. Background technique [0002] Due to the characteristics of low permeability and dense structure of coal seams in my country, with the increase of mining depth, the process of coal mining is often accompanied by various disasters and accidents such as gas explosion, coal and gas outburst, gas poisoning and suffocation, and rock burst. This not only poses a huge threat to the life safety of coal miners and mine property, but also restricts the development of the coal industry. [0003] In order to improve the characteristics of coal seams in my country, to increase the permeability of coal seams, reduce the impact of coal seams, and prevent the occurrence of gas accidents, some scholars have used physical means (such as intensive drilling, advanced discharge drill...

Claims

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Application Information

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IPC IPC(8): E21F5/06
CPCE21F5/06
Inventor 安文博王来贵李喜林刘向峰赵国超王张蓉
Owner LIAONING TECHNICAL UNIVERSITY
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