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Clean fracturing fluid for oil fields and preparation method thereof

A technology for cleaning fracturing fluids and oil fields, applied in chemical instruments and methods, and drilling compositions, etc., can solve problems such as inability to meet the requirements of high-temperature oil and gas fields, low temperature resistance of clean fracturing fluids, and inconvenient use on site , to achieve the effect of good sand carrying performance, low cost and convenient on-site use

Active Publication Date: 2016-08-03
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

[0003] At present, there are some reports on the research on clean fracturing fluids. For example, literature ("Fine Petrochemical Progress", 2011, volume 12, period 10, 5-8) discloses an acidic clean fracturing fluid and a preparation method thereof. Gemini surfactants are synthesized from stearic acid, N,N-dimethylaminopropylamine and 1,3-dichloro-2-propanol, and the synthesized gemini surfactants are combined with hydrochloric acid to form an acidic cleaning pressure However, the acidic fracturing fluid has the following disadvantages: unstable performance, easy to form precipitation when the temperature is low, and it is very inconvenient to use on site; in addition, the temperature resistance of the clean fracturing fluid is not high. The viscosity of the fracturing fluid drops below 50mPa·S, which cannot meet the requirements of high-temperature oil and gas fields
CN104073235A discloses "a long carbon chain amide betaine type clean fracturing fluid and its preparation method", but when configuring the clean fracturing fluid, various additives such as low-carbon alcohol and iron stabilizer are required, and the liquid preparation workload is large , long time and high cost

Method used

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  • Clean fracturing fluid for oil fields and preparation method thereof
  • Clean fracturing fluid for oil fields and preparation method thereof
  • Clean fracturing fluid for oil fields and preparation method thereof

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0023] Molar ratio: stearic acid: acetic acid: 4-amino-N,N-dimethylaniline: N,N'-diaminoethyl ethylenediamine: potassium hydroxide=1:2:1:1:0.3 , Stearic acid: acetic acid: 1,3-dichloro-2-propanol = 1:2:3 prepare the raw materials. Mixed solvent is V Ethanol :V water =1:1, the added mass is 10% of the total mass of the reactants.

[0024] In the reactor equipped with electric stirrer, condenser, thermometer and oil bath heating, add stearic acid, acetic acid, 4-amino-N,N-dimethylaniline, N,N in the above molar ratio. '-Diaminoethylethylenediamine and potassium hydroxide were stirred and heated to 90°C, kept at the temperature for 8 hours, and cooled to room temperature to obtain an intermediate. Mix the intermediate and 1,3-dichloro-2-propanol uniformly in the mixed solvent, stir and raise the temperature to 70°C, keep the temperature for 6 hours, and cool to room temperature. The resulting reddish-brown liquid is the gemini surfactant of the present invention . The Gemini su...

Embodiment 2

[0026] According to the molar ratio: stearic acid: erucic acid: 2-amino-N,N-dimethylacetamide: N,N'-diaminopropyl ethylenediamine: sodium ethoxide=1:1:1:1: 0.1, stearic acid: erucic acid: 1,3-dibromo-2-propanol=1:1:2 prepare the raw materials. Mixed solvent is V Isopropanol :V water =1:1.5, the added mass is 20% of the total mass of the reactants.

[0027] In the reactor equipped with electric stirrer, condenser, thermometer and oil bath heating, add stearic acid, erucic acid, 2-amino-N,N-dimethylacetamide, N , N'-Diaminopropyl ethylenediamine and sodium ethoxide, stirred and heated to 110°C, kept the temperature for 10 hours, and cooled to room temperature to obtain an intermediate. Mix the intermediate and 1,3-dibromo-2-propanol in a mixed solvent uniformly, stir and raise the temperature to 80°C, keep the temperature to react for 8 hours, and cool to room temperature. The resulting reddish-brown liquid is the gemini surfactant of the present invention . The Gemini surfac...

Embodiment 3

[0029] According to the molar ratio: benzenesulfonic acid: oleic acid: 4-methyl-N,N-dimethylbenzeneacetamide: N,N'-diaminobutylethylenediamine: sodium ethoxide=1:2:1: 1:0.3, benzenesulfonic acid: oleic acid: 1,3-dibromo-2-propanol=1:2:4, prepare the raw materials. Mixed solvent is V Ethanol :V water =1.5:1, the added mass is 10% of the total mass of the reactants.

[0030] Add benzenesulfonic acid, oleic acid, 4-methyl-N,N-dimethylbenzeneacetamide in the reactor equipped with electric stirrer, condenser, thermometer and oil bath heating conditions according to the above molar ratio , N,N'-Diaminobutylethylenediamine and sodium ethoxide, stir and raise the temperature to 100°C, keep the temperature for 12 hours, and cool to room temperature to obtain the intermediate. Mix the intermediate and 1,3-dibromo-2-propanol in a mixed solvent uniformly, stir and raise the temperature to 60°C, keep the temperature for 12 hours, and cool to room temperature. The resulting reddish-brown li...

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Abstract

The invention discloses clean fracturing fluid for oil fields and a preparation method thereof, belonging to the technical field of oil production engineering in the petroleum industry. The clean fracturing fluid can be obtained by synthesizing a gemini surfactant by using organic acids, an N,N-dimethylamino compound, an N,N'-diaminoalkylethylenediamine compound and halohydrin as raw materials and then stirring a water solution of the gemini surfactant and an ammonium chloride solution according to a certain proportion. Compared with traditional fracturing fluid, the clean fracturing fluid has good temperature and shear resistance and good sand-carrying property, dispenses with gel breakers and reverse discharge and is convenient to use.

Description

Technical field [0001] The invention relates to an oil field clean fracturing fluid and a preparation method thereof, and belongs to the technical field of oil extraction engineering in the petroleum industry. Background technique [0002] In recent years, with the rapid growth of China's economy, energy shortages have increasingly restricted my country's economic development. The most fundamental way to solve this problem is to strengthen our independent development capabilities and increase my country's oil and gas production and recovery efficiency. Fracturing technology is an important means to improve the production capacity of low-permeability oil and gas reservoirs and the recovery rate of oil and gas wells, and fracturing fluid is a key factor affecting the fracturing effect. At present, most domestic water-based vegetable glue fracturing fluids are used in China. While this fracturing fluid is transforming the reservoir, due to the presence of fracturing fluid residues,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/602C09K8/68
Inventor 郭辉张国宝庄玉伟曹健赵根锁
Owner HIGH & NEW TECH RES CENT OF HENAN ACAD OF SCI
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