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Acid clean fracturing fluid and preparation method thereof

A clean fracturing fluid and acidic technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of limited formation acidification capacity, heavy fluid mixing workload, long time, etc., and achieve good sand-carrying performance, Strong acidifying ability and low cost effect

Active Publication Date: 2019-06-21
HIGH & NEW TECH RES CENT OF HENAN ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned acidic fracturing fluids can be applied to the development of carbonate reservoirs, there are still some shortcomings: when preparing acidic clean fracturing fluids, a variety of additives are required, which requires a large amount of work, long time and high cost; existing acidic fracturing fluids The acid concentration in the clean fracturing fluid is low (HCl concentration is generally 8%-10%), and the acidification ability to the formation is limited

Method used

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  • Acid clean fracturing fluid and preparation method thereof
  • Acid clean fracturing fluid and preparation method thereof
  • Acid clean fracturing fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Molar ratio: stearic acid: erucic acid: 2-amino-N,N-dimethylacetamide: KF / γ-Al 2 o 3 =1:2:1:0.3, stearic acid: erucic acid: l,3-dichloro-2-propanol = 1:2:3 Prepare raw materials, mixed solvent is V 乙醇 :V 水 =1:1.

[0028] Add stearic acid, erucic acid, 2-amino-N,N-dimethylacetamide and KF / γ-Al 2 o 3 , stirring and raising the temperature to 90° C., maintaining the temperature for 8 hours, and cooling to room temperature to obtain an intermediate. Mix the intermediate and 1,3-dichloro-2-propanol in a mixed solvent evenly, stir and heat up to 70°C, keep the temperature for 6 hours, cool to room temperature, and the obtained reddish-brown liquid is the gemini surfactant of the present invention .

[0029] The acidic cleaning fracturing fluid Y1 is obtained by mixing and stirring according to the following proportions, and the components are expressed in mass percent: 0.8% of the gemini surfactant of the present invention, 20% of hydrochloric acid, and the rest is wa...

Embodiment 2

[0031] Molar ratio: palmitic acid: erucic acid: 4-amino-N,N-dimethylaniline: K / γ-Al 2 o 3 = 1:1:1:0.1, palmitic acid: erucic acid: l,3-dibromo-2-propanol = 1:1:2 Prepare raw materials, mixed solvent is V 异丙醇 :V 水 =1:1.5.

[0032] Add palmitic acid, erucic acid, 4-amino-N,N-dimethylaniline and K / γ-Al 2 o 3 , stirring and raising the temperature to 110° C., maintaining the temperature for 10 hours, and cooling to room temperature to obtain an intermediate. Mix the intermediate and 1,3-dibromo-2-propanol in a mixed solvent evenly, stir and heat up to 80°C, keep the temperature for 8 hours, cool to room temperature, and the obtained reddish-brown liquid is the gemini surfactant of the present invention .

[0033] The acidic cleaning fracturing fluid Y2 is obtained by mixing and stirring according to the following proportions, and the components are expressed in mass percent: 0.5% of the gemini surfactant of the present invention, 20% of hydrochloric acid, and the rest is w...

Embodiment 3

[0035] Molar ratio: benzoic acid: oleic acid: 4-methyl-N,N-dimethylphenylacetamide: KCO 3 / γ-Al 2 o 3 = 1:2:1:0.3, benzoic acid: oleic acid: 1,3-dibromo-2-propanol = 1:2:4 Prepare raw materials, mixed solvent is V 乙醇 :V 水 =1.5:1.

[0036] In the reaction kettle equipped with electric stirrer, condenser, thermometer and oil bath heating condition, add benzoic acid, oleic acid, 4-methyl-N,N-dimethylphenylacetamide and KCO 3 / γ-Al 2 o 3, stirring and raising the temperature to 100° C., maintaining the temperature for 12 hours, and cooling to room temperature to obtain an intermediate. Mix the intermediate and 1,3-dibromo-2-propanol in a mixed solvent evenly, stir and raise the temperature to 60°C, keep the temperature for 12 hours, cool to room temperature, and the obtained reddish-brown liquid is the gemini surfactant of the present invention .

[0037] The acidic cleaning fracturing fluid Y3 is obtained by mixing and stirring according to the following proportions, eac...

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PUM

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Abstract

The invention discloses an acid clean fracturing fluid and a preparation method thereof and belongs to the technical field of oil production engineering in the petroleum industry. The acid clean fracturing fluid can be obtained by using two organic acids, N,N-dimethylamino compound and halogenated alcohol as raw materials to synthesize a dimeric surfactant and then mixing and stirring the dimericsurfactant with hydrochloric acid and water according to a certain ratio. Compared with a traditional acid fracturing fluid, the acid clean fracturing fluid disclosed by the invention has the advantages that the usage of the dimeric surfactant is small (0.5-1%), the formation acidification capacity is high (the HCl concentration is 20%), the temperature resisting and shear resisting performance isgood, the sand carrying performance is good, gel breaking is easy, and there is no residue after gel breaking.

Description

technical field [0001] The invention relates to an acidic clean fracturing fluid and a preparation method thereof, belonging to the technical field of oil recovery engineering in the petroleum industry. Background technique [0002] Acidic clean fracturing fluid is a fracturing fluid that can form gel under acidic conditions and can effectively carry sand and transport proppant. It is usually composed of surfactants, acid liquids (one or a mixture of several types), and a small amount of additives. . The acidic clean fracturing fluid realizes simultaneous acid etching and sand-carrying, and can form longer and multi-branched acid etching-support composite fractures in the reservoir section, improving the stimulation effect of oil and gas wells. At the same time, it eliminates the disadvantages of traditional alkaline fracturing fluids reacting with rock formations to form insoluble sediments and scaling on the surface of construction equipment. [0003] At present, there a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74
Inventor 郭辉庄玉伟庞海岩曹健张国宝
Owner HIGH & NEW TECH RES CENT OF HENAN ACAD OF SCI
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