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Coal bed gas clean-fracturing fluid

A clean fracturing fluid and coalbed methane technology, applied in the field of coalbed gas fracturing, can solve the problems of high cost and wide application constraints, and achieve the effects of low cost, enhanced hydrophobic binding force, and improved effect

Inactive Publication Date: 2015-01-28
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the use of clean fracturing fluid in coal seam construction is still in the experimental stage, and its wide application is restricted due to its high cost

Method used

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  • Coal bed gas clean-fracturing fluid
  • Coal bed gas clean-fracturing fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The clean fracturing fluid for coalbed methane in this embodiment is made by mixing the following raw materials in mass percent: 0.5% of a gemini-type surfactant with general formula III, 3% of a counter ion additive, and the balance is water; The counter ion additive is sodium salicylate;

[0033] The gemini-type surfactant having the general formula III is prepared by reacting a tertiary amine having the general formula I and a p-xylene substituent having the general formula II, and the reaction equation is:

[0034]

[0035] where R is C 12 h 25 ; X is Cl;

[0036] The preparation method of the gemini surfactant with general formula III comprises the following steps:

[0037] Step 1, reflux reaction: Add 0.2 mol of tertiary amine with general formula I and 0.1 mol of p-xylene substitute with general formula II into 20 mL of ethanol (chemical or analytical pure), and reflux at a temperature of 85°C Reacted for 48h, then distilled to obtain crude product;

[00...

Embodiment 2

[0052] The coalbed methane clean fracturing fluid of this embodiment is made by mixing the following raw materials in mass percentage: 0.5% of a gemini-type surfactant with general formula III, 2% of a counter ion additive, and the balance is water; The counter ion aid is sodium bromide;

[0053] The gemini-type surfactant having the general formula III is prepared by reacting a tertiary amine having the general formula I and a p-xylene substituent having the general formula II, and the reaction equation is:

[0054]

[0055] where R is C 12 h 25 ;X is Br;

[0056] The preparation method of the gemini surfactant with general formula III comprises the following steps:

[0057] Step 1, reflux reaction: add 0.22mol of tertiary amine with general formula I and 0.1mol of p-xylene substitute with general formula II into 35mL of ethanol (chemical or analytical pure), and reflux at a temperature of 85°C Reacted for 48h, then distilled to obtain crude product;

[0058] Step 2, ...

Embodiment 3

[0063] The coalbed methane clean fracturing fluid of this embodiment is made by mixing the following raw materials in mass percentage: 3% of gemini surfactant with general formula III, 6% of counter ion additive, and the balance is water; The counter ion aid is potassium bromide;

[0064] The gemini-type surfactant having the general formula III is prepared by reacting a tertiary amine having the general formula I and a p-xylene substituent having the general formula II, and the reaction equation is:

[0065]

[0066] where R is C 14 h 29 ; X is Cl;

[0067] The preparation method of the gemini surfactant with general formula III comprises the following steps:

[0068] Step 1, reflux reaction: add 0.24mol of tertiary amine with general formula I and 0.1mol of p-xylene substitute with general formula II into 50mL of ethanol (chemical or analytical pure), and reflux at a temperature of 95°C Reacted for 24h, then distilled to obtain crude product;

[0069] Step 2, recryst...

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Abstract

The invention discloses a coal bed gas clean-fracturing fluid. The coal bed gas clean-fracturing fluid is prepared from 0.3-3% by mass of a gemini surfactant shown in the general formula III, 1-6% by mass of an counter ion auxiliary agent and the balance water by mixing. The counter ion auxiliary agent is sodium salicylate, potassium chloride, potassium bromide or sodium bromide. The coal bed gas clean fracturing fluid has the characteristics of high efficiency, low damage and low cost, realizes residue-free coal bed gas yield increasing, has temperature resistance and shearing resistance better than those of the traditional clean fracturing fluid, has excellent breaking property, can realize complete breaking after use of a breaking agent for two hours and does not produce residue in the broken liquid. The coal bed gas clean fracturing fluid can be prepared by simple processes, has a low cost, has tiny influence on coal surface interface properties, stratum and coal seam, has excellent fracturing performances and can be widely used.

Description

technical field [0001] The invention belongs to the technical field of coal bed gas fracturing, and in particular relates to a coal bed gas clean fracturing fluid. Background technique [0002] Coalbed methane is a very important unconventional natural gas. Its methane content is generally greater than 95%. It is one of the high-quality clean gas energy sources. However, the elastic modulus and gas reservoir pressure of coal seams are relatively small, while the compressibility coefficient is relatively high, and gas and water coexist. , its natural fractures are developed, and the gas layer is also easily damaged. Fracturing technology is a very important means to increase the production of coalbed methane, in which fracturing fluid plays the role of transmitting pressure and carrying proppant, and is an important part of fracturing construction. Fracturing fluid is an important factor for successful fracturing of coalbed methane wells. On the one hand, it is required to b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/68C09K8/602C09K2208/26
Inventor 杨志远王晓华杨伏生任晓媛曹水静管保山刘萍龙江
Owner XIAN UNIV OF SCI & TECH
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