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High temp. thicking oil viscosity reducing agent and preparation process thereof

A technology of viscosity reducer and viscosity reducer for heavy oil, which can be used in earth-moving drilling, production fluids, wellbore/well components, etc., and can solve problems such as scaling, clay swelling, and potential hazards in the oil production process.

Inactive Publication Date: 2005-01-05
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The addition of alkaline substances will cause clay swelling, scaling, etc., which is a potential hazard to the oil recovery process

Method used

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  • High temp. thicking oil viscosity reducing agent and preparation process thereof
  • High temp. thicking oil viscosity reducing agent and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The first step: the preparation of N-hexadecyl-β-aminopropionitrile.

[0018] Add 0.1mol hexadecylamine and 0.4g sodium carbonate to a three-necked flask, raise the temperature to 50°C, add dropwise 0.125mol acrylonitrile, and react for 4 hours to obtain N-hexadecyl-β-aminopropionitrile, the conversion is 95%.

[0019] The second step: the preparation of N-hexadecylpropylenediamine.

[0020] Add 0.1mol N-alkyl-β-aminopropionitrile and 50ml of isopropanol into the autoclave, replace the air in the autoclave with nitrogen, then introduce hydrogen and chlorine, and react at 80°C for 2 hours to obtain N- Hexadecylpropylenediamine, the conversion rate is 97%.

[0021] The third step: the preparation of N-hexadecane-γ-bisquaternary ammonium cationic surfactant.

[0022] Add 0.1mol N-hexadecylpropylenediamine and 0.3mol sodium carbonate to the autoclave, replace the air in the autoclave with nitrogen, then raise the temperature to 60°C and feed 0.8mol methyl chloride, at 90...

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Abstract

The invention provides a higher-temperature resistant crude oil viscosity reductant and its preparing method, and it is N-alkyl-gama-di-quaternary cation surfactant, and its preparing method includes three steps: (1) taking aliphatic amine and catalyst in a three-mouthed bottle, dropping in acrylic nitricle at 30-60 deg.C and reacting for 4-8 hours, makeing N-alkyl-beta- amino-propionitrile; (2) adding the N-alkyl-beta-amino-propionitrile and solvent in a high-pressure kettle, displacing the air in the kettle with nitrogen gas, charging in hydrogen gas and chlorine gas and reacting for 1-2 hours at 80-90 deg.C, preparing N-alkyl trimethylene diamine; (3) adding N-alkyl trimethylene diamine and catalyst in the kettle, using nitrogen gas to displace the air in the kettle, raising temperature to 60 deg.C and charging in chloromethane, reacting at 80-90 deg.C at 0.49-0.59 MPa for 2-6 hours to prepare the surfactant, which is prepared into 25-30% water solution, obtaining the viscosity reductant. It need not mix with the alkali and has better viscosity-reducing effect on different crude oils at lower concentration.

Description

Technical field: [0001] The invention relates to a high-temperature heavy oil viscosity reducer for oil fields. Background technique: [0002] my country is rich in heavy oil resources, with geological reserves of 1640Mt, of which land heavy oil accounts for more than 20% of the total petroleum resources. [0003] The prominent feature of heavy oil is high colloidal asphaltene content and high viscosity, so the key to the development of heavy oil is to reduce viscosity and improve fluidity. At present, the main methods of mining extra heavy oil in my country are thermal recovery technologies such as steam huff and puff and steam flooding. In the later stage of huff and puff, the contradictions such as low oil-gas ratio in steam injection production, high viscosity of crude oil, and difficulty in wellbore lifting became increasingly prominent, which restricted the further development of heavy oil reservoirs. Injection of high-efficiency heavy oil viscosity reducer with stea...

Claims

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Application Information

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IPC IPC(8): E21B43/22
Inventor 葛际江张贵才孙铭勤宋昭峥
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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