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Pulverized coal dispersing agent and active water fracturing fluid for fracturing of coal bed gas well

A technology for coalbed methane wells and dispersants, which is applied to drilling compositions, chemical instruments and methods, etc., can solve the problems of difficulty in obtaining production capacity, increased cost of coalbed methane well mining and development, and high Poisson's ratio, reducing the number of pump inspections, The effect of avoiding coal dust aggregation

Active Publication Date: 2010-04-14
CHINA UNITED COALBED METHANE NAT ENGRES CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Coalbed methane reservoirs are characterized by low porosity and low permeability. It is difficult for conventional vertical coalbed methane wells to obtain productivity without fracturing.
Coal is an unconventional reservoir with low Young's modulus, high Poisson's ratio, low hardness, and is easily broken. It is easy to be crushed and compacted during fracturing to produce coal powder. Moisture, unable to disperse in water, distributed in clusters, causing high pump pressure and large fluctuations during the fracturing process, pulverized coal will also cause blockage of fracture channels, affecting the fracturing effect of coalbed methane wells
At the same time, during the drainage process, the number of pump inspections is increased, which increases the cost for the mining and development of coalbed methane wells
[0003] At present, there is no product that can solve this problem in China. By changing the wettability of the surface of coal powder particles, the present invention enables the coal powder to be evenly dispersed in the fracturing fluid and suspended in the fracturing fluid, avoiding pressure during fracturing construction. fluctuations, to ensure the effect of fracturing construction, and to reduce the mining cost of coalbed methane wells

Method used

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  • Pulverized coal dispersing agent and active water fracturing fluid for fracturing of coal bed gas well
  • Pulverized coal dispersing agent and active water fracturing fluid for fracturing of coal bed gas well
  • Pulverized coal dispersing agent and active water fracturing fluid for fracturing of coal bed gas well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Mix octylphenol polyoxyethylene (10) ether (abbreviated as OP-10), 12-alkyl-3-methylammonium chloride, and ethanol in a ratio (mass ratio) of 2:1:7 to prepare a clarified Transparent coal powder dispersant stock solution. Add 0.15 parts by mass of coal powder dispersant stock solution and 1.0 to 1.5 parts by mass of potassium chloride into 98.85 to 98.35 parts by mass of water, and mix evenly to form a clear and transparent coal powder dispersant active water fracturing fluid, coal powder The stock solution of the dispersant accounts for 0.15% of the total mass of the final fracturing fluid, and the potassium chloride accounts for 1.0-1.5% of the total mass of the final fracturing fluid. The prepared fracturing fluid can be used in the fracturing of coalbed methane wells with low pulverized coal content. During fracturing, it can be used as a pre-fluid or a sand-carrying fluid alone, or it can be used in the whole process. According to the pre-fluid, sand-carrying fluid...

Embodiment 2

[0027] Mix octylphenol polyoxyethylene (10) ether (abbreviated as OP-10), 12-alkyl-3-methylammonium chloride, and diethyl ether in a ratio (mass ratio) of 2:1:7 to prepare a clarified Transparent coal powder dispersant stock solution. Add 0.15 parts by mass of coal powder dispersant stock solution and 1.0 to 1.5 parts by mass of potassium chloride into 98.85 to 98.35 parts by mass of water, and mix evenly to form a clear and transparent coal powder dispersant active water fracturing fluid, coal powder The stock solution of the dispersant accounts for 0.15% of the total mass of the final fracturing fluid, and the potassium chloride accounts for 1.0-1.5% of the total mass of the final fracturing fluid. The prepared fracturing fluid can be used in the fracturing of coalbed methane wells with low pulverized coal content. During fracturing, it can be used as a pre-fluid or a sand-carrying fluid alone, or it can be used in the whole process. According to the pre-fluid, sand-carrying...

Embodiment 3

[0029] For coalbed methane well fracturing with higher pulverized coal content, the consumption of the coal powder dispersant stock solution in the fracturing fluid of embodiment 1 or embodiment 2 can be increased from 0.15 mass parts to 0.20 mass parts, simultaneously in the fracturing fluid The adaptability of the water used is reduced, and the amount of potassium chloride remains unchanged, that is, the stock solution of coal powder dispersant in the fracturing fluid is increased from 0.15% to 0.20% of the total mass of the fracturing fluid, and the effect will be better; if the reservoir The content of medium pulverized coal is very high, and the consumption of the coal powder dispersant stock solution in the fracturing fluid of Example 1 can also be increased to 0.25 parts by mass, and the adaptability of the amount of water used in the fracturing fluid is reduced simultaneously, and the amount of potassium chloride No change, that is, the stock solution of coal powder dis...

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Abstract

The invention provides a pulverized coal dispersing agent and an active water fracturing fluid for fracturing of a coal bed gas well. The pulverized coal dispersing agent is characterized in that the pulverized coal dispersing agent comprises the following components: (1) a non-ionic surface active agent; (2) organic ammonium salt; and (3) alcohol, wherein the non-ionic surface active agent is octyl phenol polyoxyethylene ether, the organic ammonium salt is 12-alkyl-3-methylammonium chloride, and the alcohol is ethyl alcohol, propyl alcohol, butyl alcohol or amyl alcohol; and the mass ratio of the non-ionic surface active agent, the organic ammonium salt and the alcohol is 2:1:7. The invention can lead the pulverized coal to be uniformly distributed in the fracturing fluid, reduce construction pressure, simultaneously discharge the pulverized coal out of the stratum with the fracturing fluid when discharging the fluid and avoid the blocking of crack channels.

Description

technical field [0001] The invention relates to a dispersant and active water fracturing fluid for coalbed gas well fracturing, in particular to a coalbed gas well fracturing agent capable of uniformly dispersing coal powder in the fracturing fluid, preventing coal powder from agglomerating, reducing A coal powder dispersant for stabilizing construction pressure, and an active water fracturing fluid containing the coal powder dispersant. Background technique [0002] Coalbed methane reservoirs are characterized by low porosity and low permeability. It is difficult for conventional vertical coalbed methane wells to obtain productivity without fracturing. Coal is an unconventional reservoir with low Young's modulus, high Poisson's ratio, low hardness, and is easily broken. It is easy to be crushed and compacted during fracturing to produce coal powder. Wet, unable to disperse in water, distributed in clusters, causing high pump pressure and large fluctuations during the fract...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
Inventor 李曙光孙斌刘川庆
Owner CHINA UNITED COALBED METHANE NAT ENGRES CENT
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