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A degradable water-based clean fracturing fluid thickener used in oil and gas fields

A technology of clean fracturing fluid and thickener, applied in the direction of organic chemistry, drilling composition, chemical instruments and methods, etc., can solve the problems of poor environmental degradation performance and complicated preparation of clean fracturing fluid, and achieve excellent durability The effects of temperature and shear resistance, good cleaning and anti-discharge ability, and good temperature and shear resistance

Active Publication Date: 2018-08-21
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a degradable water-based clean fracturing fluid thickener used in oil and gas fields and a degradable water-based clean fracturing fluid containing the thickener , the purpose of which is to use a betaine-type amphoteric surfactant thickener with ester and sulfo groups with good degradation performance to prepare clean fracturing fluid. Coated into a spherical structure, the clean fracturing fluid can automatically break the gel, thus solving the current technical problems of poor environmental degradation performance and complicated preparation of clean fracturing fluid

Method used

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  • A degradable water-based clean fracturing fluid thickener used in oil and gas fields
  • A degradable water-based clean fracturing fluid thickener used in oil and gas fields
  • A degradable water-based clean fracturing fluid thickener used in oil and gas fields

Examples

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Effect test

Embodiment 1

[0042] Under the catalysis of p-toluenesulfonic acid, palmitic acid (16) is esterified with N,N-dimethylethanolamine, and then quaternized with 1,3-propane sultone to obtain And sulfo betaine type amphoteric surfactant cleaning fracturing fluid thickener. The molar ratio of palmitic acid to N,N-dimethylethanolamine is 1:1.2, the catalyst p-toluenesulfonic acid is 0.5%, the molar ratio of esterified product to 1,3-propane sultone is 1:1.3, and the synthesis is Cetyl sulfobetaine thickener.

[0043] According to the mass percentage, the hexadecanoate-based sultaine thickener and the cross-linking agent sodium salicylate are respectively dissolved in water, and then mixed to form a degradable water-based clean fracturing fluid with uniform viscosity. The mass percent of each component is: thickener 4.0%, crosslinking agent 1.0%, water 95%.

Embodiment 2

[0045] Repeat Example 1 with the same procedure as described, except that stearic acid is used instead of palmitic acid. The molar ratio of stearic acid (18) to N,N-dimethylethanolamine is 1:1.5, the catalyst p-toluenesulfonic acid is 1.5%, and the molar ratio of esterified product to 1,3-propane sultone is 1:1.2 , The composition is stearic acid ester sulfobetaine thickener.

[0046] According to the mass percentage, the stearic carbonate-based sulfobetaine thickener and the cross-linking agent EDTA are respectively dissolved in water, and then mixed to form a degradable water-based clean fracturing fluid with uniform viscosity. The mass percent of each component is: thickener 3.0%, crosslinking agent 0.6%, water 96.4%.

Embodiment 3

[0048] Repeat Example 1 with the same steps as described, the difference is that palmitic acid is replaced with arachidic acid. The molar ratio of arachidic acid (c20) to N,N-dimethylethanolamine is 1:1.6, the catalyst p-toluenesulfonic acid is 1.0%, and the molar ratio of esterified product to 1,3-propanesultone is 1:1.1, The composition is eicosanate sulfobetaine thickener.

[0049] According to the mass percentage, the eicosanate-based sultaine thickener and the cross-linking agent sodium salicylate are respectively dissolved in water, and then mixed to form a degradable water-based clean fracturing fluid with uniform viscosity. The mass percent of each component is: thickener 2.0%, crosslinking agent 0.8%, water 97.2%.

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Abstract

The invention discloses a degradable water-based clean fracturing fluid densifier used in oil and gas fields. A betaine type ampholytic surfactant densifier containing an ester group and a sulfo group and represented by formula (I) can be used in a degradable water-based clean fracturing fluid, and allows gel breaking of the degradable water-based clean fracturing fluid to be automatically realized and the viscosity fracturing fluid to still keep at 50mPa.s or above after shearing for 1h. The main chemical components of the degradable water-based clean fracturing fluid comprise 1.5-4.0 mass% of the betaine type ampholytic surfactant densifier containing an ester group and a sulfo group and 0.5-1.0 mass% of a cross-linking agent. The degradable water-based clean fracturing liquid has the advantages of good biodegradability, small influences on environment, good temperature and shearing resistance, complete gel breaking without residues, and simple preparation.

Description

technical field [0001] The invention belongs to the field of petroleum exploitation engineering, in particular to a degradable water-based clean fracturing fluid thickener used in oil and gas fields. Background technique [0002] Fracturing is widely used as the main means to increase production capacity in oil and gas fields, and the widely used fracturing fluid system is water-based fracturing fluid. At present, the thickeners used in water-based fracturing fluids are mainly vegetable gum natural polymers and synthetic polymers. The relatively large molecular weight of the polymer has the disadvantages of poor solubility and many water-insoluble substances. After the gel is broken, there are a large number of residues that can reduce the permeability of the formation, which will damage the formation and make the fracturing effect worse. Clean fracturing fluids using viscoelastic surfactants can reduce damage to reservoirs and fractures and improve fracturing effects. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68C07C309/14C07C303/32
CPCC07C303/32C07C309/14C09K8/602C09K8/685
Inventor 付朝阳石亚丽黄金营
Owner HUAZHONG UNIV OF SCI & TECH