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Surfactant formula system for oil displacement and application thereof in tertiary oil recovery

A surfactant and formula technology, which is applied to the surfactant formulation system for oil displacement and its application in tertiary oil recovery, can solve the problems of oil field production impact, high viscosity, increase polymer concentration, etc., so as to improve the oil recovery of crude oil. high efficiency, good biodegradability, and the effect of avoiding the treatment process

Active Publication Date: 2013-04-24
黑龙江吉地油田服务股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the ASP flooding technology, the presence of alkali in the formula not only greatly increases the concentration of the polymer, but more importantly, greatly reduces the viscoelasticity of the polymer, thus reducing the overall oil displacement efficiency of the polymer
At the same time, due to the presence of alkali, W / O emulsion with high viscosity appears in the produced fluid, which not only affects the productivity of the oil well, but also increases the difficulty of breaking the emulsion
Moreover, the fouling of oil layers and oil wells caused by alkali also has a serious impact on oil field production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Synthesis of fatty amidoalkyl betaines:

[0028] In a 1000mL three-necked flask equipped with a condenser, a stirrer and a thermometer, add 384g of palmitic acid, heat it to 60°C, and after it is completely melted, add 168g of N,N-dimethyl-1,3-propylenediamine, pass through N 2 Deoxygenation in 30 minutes, be warming up to reflux temperature, react for 3 hours, then pass N 2 Under the conditions, the distillation reaction was carried out at 180° C. for 4 hours to obtain the palmitic acid amide intermediate.

[0029] In a 1000mL three-necked flask equipped with a condenser, a stirrer, and a thermometer, add 33g of chloroacetic acid and 171g of industrial ethanol, and then add 14g of sodium hydroxide solution with a mass percentage of 25% under stirring, and stir for a period of time to make it fully react. And adjust the pH value of the system to between 8-9, then, add 107g of the intermediate palmitic acid amide prepared by the above reaction. Raise the temperature to...

Embodiment 2

[0034] Synthesis of fatty amidoalkyl betaines:

[0035] In a 1000mL three-necked flask equipped with a condenser, a stirrer and a thermometer, add 284g of stearic acid, heat it to 60°C, and after it is completely melted, add 101g of N,N-dimethylethylenediamine, and pass through N 2 Deoxygenation in 30 minutes, be warming up to reflux temperature, react for 3 hours, then pass N 2 Under the conditions, the distillation reaction was carried out at 180° C. for 5 hours to obtain the palmitic acid amide intermediate.

[0036] In a 1000mL three-necked flask equipped with a condenser, a stirrer, and a thermometer, add 37g of chloropropionic acid and 179g of industrial ethanol, and then add 14g of sodium hydroxide solution with a mass concentration of 25% under stirring, and stir for a period of time to make it fully react , and adjust the pH value of the system to between 8 and 9, and then add 112 g of the intermediate stearic acid amide prepared by the above reaction. Raise the tem...

Embodiment 3

[0041]Mix the active substance content of the surfactant formulation system obtained in the above Example 3 with 0.3%, polyacrylamide 0.2%, water 99.35%, sodium carbonate 0.1% and diethylene glycol monobutyl ether 0.05%, and stir for 30 minutes to obtain Binary compound oil displacement system composed of surfactant formulation system and polymer of the present invention sample;

[0042] Or mix 0.3% active matter content, 0.3% polyacrylamide, 99% water, 0.2% sodium silicate and 0.2% propanol in the surfactant formulation system obtained in the above-mentioned embodiment 3, and stir for 30 minutes to obtain the surface active substance of the present invention. Binary composite flooding system composed of active agent formulation system and polymer sample;

[0043] Or mix 0.25% active matter content, 0.4% polyacrylamide, 98.67% water, 0.6% sodium silicate and 0.08% sodium chloride obtained in the above-mentioned embodiment 3, and stir for 30 minutes to obtain the present in...

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Abstract

The invention relates to a surfactant formulation system and its application in tertiary oil recovery technology. The surfactant formula system includes fatty amidoalkyl betaine, fatty alcohol polyoxyethylene ether and alkyl carboxylate. The surfactant formula system - polymer binary composite oil displacement system, does not need to add alkali, has no damage to the formation, and can form 10-3 ~ 10-4mN / m ultra-low interfacial tension, can effectively displace the remaining oil in the oil layer, and increase the oil recovery rate of crude oil by more than 18%.

Description

technical field [0001] The invention belongs to the field of oil field chemistry, and in particular relates to a surfactant formulation system for oil displacement and its application in tertiary oil recovery. Background technique [0002] Many oilfields have entered the late stage of development after primary and secondary oil recovery, but there is still a large amount of residual oil remaining in the formation, so the tertiary oil recovery technology has been widely valued. Tertiary oil recovery technologies mainly include polymer flooding, chemical composite flooding, gas miscible flooding, steam flooding, microbial flooding, etc. Among them, chemical composite flooding refers to the composite oil flooding technology of alkali / surfactant / polymer or both or the combination of the three. The polymer increases the viscosity of the displacement fluid and improves the oil / water mobility ratio and water absorption. profile, its viscosity elasticity also has a certain oil wash...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584
Inventor 孙安顺
Owner 黑龙江吉地油田服务股份有限公司
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