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Gemini viscoelastic surfactant and its preparation method, application and steering acid

A technology of surfactant and viscoelasticity, which is applied in the field of Gemini viscoelastic surfactant and its preparation, and steering acid, which can solve the problem of temperature resistance lower than 120°C, and achieve good temperature resistance, strong viscosity increasing ability, and formation small damage effect

Active Publication Date: 2021-07-27
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the viscoelastic surfactants for acidification reported at home and abroad are mainly monad viscoelastic surfactants, and the temperature resistance is generally lower than 120°C

Method used

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  • Gemini viscoelastic surfactant and its preparation method, application and steering acid
  • Gemini viscoelastic surfactant and its preparation method, application and steering acid
  • Gemini viscoelastic surfactant and its preparation method, application and steering acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Dissolve 0.1mol ethanolamine in absolute ethanol, dissolve 0.1mol 1,3-propane sultone in absolute ethanol, add dropwise ethanolamine alcohol solution, react at room temperature for 12 hours, and remove the solvent by rotary evaporation to obtain intermediate Body A;

[0037] (2) Dissolve 0.1 mol of intermediate A in 50% ethanol solution, add an appropriate amount of concentrated hydrochloric acid and 0.2 mol of epichlorohydrin, react at 70°C for 7 hours, and remove the solvent by rotary evaporation to obtain intermediate product B;

[0038] (3) Dissolve 0.1mol of intermediate product B in ethanol, add 0.21mol of erucamide propyl dimethylamine, add a small amount of sodium hydroxide as a catalyst, and react at 85°C for 24 hours; after the reaction, distill under reduced pressure The solvent was removed to obtain the gemini viscoelastic surfactant VDA-YA.

Embodiment 2

[0040] (1) Dissolve 0.1mol aniline in absolute ethanol, dissolve 0.1mol 1,3-propane sultone in absolute ethanol, add aniline alcohol solution dropwise, react at room temperature for 12 hours, and remove the solvent by rotary evaporation to obtain intermediate Body A;

[0041] (2) Dissolve 0.1 mol of intermediate A in 50% ethanol solution, add an appropriate amount of concentrated hydrochloric acid and 0.2 mol of epichlorohydrin, react at 70°C for 7 hours, and remove the solvent by rotary evaporation to obtain intermediate product B;

[0042] (3) Dissolve 0.1mol of intermediate product B in ethanol, add 0.21mol of erucamide propyl dimethylamine, add a small amount of sodium hydroxide as a catalyst, and react at 85°C for 24 hours; after the reaction, distill under reduced pressure The solvent was removed to obtain the gemini viscoelastic surfactant VDA-YA.

Embodiment 3

[0044] (1) Dissolve 0.1 mol of diethylamine in 50% ethanol solution, add an appropriate amount of concentrated hydrochloric acid and 0.2 mol of epichlorohydrin, react at 70°C for 7 hours, and remove the solvent by rotary evaporation to obtain intermediate product B;

[0045] (2) Dissolve 0.1mol of intermediate product B in ethanol, add 0.21mol of erucamide propyl dimethylamine, add a small amount of sodium hydroxide as a catalyst, and react at 85°C for 24 hours; after the reaction, distill under reduced pressure Remove the solvent to obtain gemini viscoelastic surfactant VDA-YT.

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Abstract

The invention provides a class of gemini viscoelastic surfactants and a preparation method thereof. Wherein, the steering acid includes: Gemini viscoelastic surfactant 3-5%, hydrochloric acid 15-18%, 1-2% acidification corrosion inhibitor, iron ion stabilizer 1%, clay stabilizer 1% by mass percentage , and the rest is water. The steering acid provided by the invention has better temperature resistance and excellent high-temperature steering performance.

Description

technical field [0001] The invention relates to the field of reservoir acidification transformation in the oil exploitation industry, in particular to a gemini viscoelastic surfactant, its preparation method, application and diverting acid. Background technique [0002] Acidizing stimulation of oil and gas reservoirs is one of the effective measures to increase production of oil and gas wells and increase injection of water injection wells. Due to the heterogeneity of the reservoir, after the acid liquid enters the formation, it preferentially enters the high-permeability area with the least resistance. Larger low-permeability areas have not been effectively acidified, resulting in increased reservoir permeability range and increased intra-layer and inter-layer contradictions. Therefore, for the acidizing transformation of heterogeneous reservoirs, the core is how to evenly place the acid solution in the high-permeability area and low-permeability area. At present, the com...

Claims

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Application Information

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IPC IPC(8): C09K8/74C07C309/14C07C233/09C07C231/12C07C303/32
Inventor 毛金成张恒林冲毛金桦杨小江
Owner SOUTHWEST PETROLEUM UNIV
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