Double-long-chain alkyl hydroxy sulfobetaine surfactant and oil-displacing agent

A technology of long-chain alkyl hydroxy sulfobeet and surfactant, which is applied in the fields of sulfonate preparation, drilling composition, chemical instrument and method, etc. , the reduction of recovery rate, etc.

Inactive Publication Date: 2013-05-22
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The commonly used petroleum sulfonate usually cannot reduce the interfacial tension of oil and water to ultra-low under the condition of no alkali, so it needs to be compounded and used. The compounded surfactant system, due to the adsorption of the formation, often leads to the appearance of chromatographic separation effect, resulting in reduction in recovery

Method used

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  • Double-long-chain alkyl hydroxy sulfobetaine surfactant and oil-displacing agent
  • Double-long-chain alkyl hydroxy sulfobetaine surfactant and oil-displacing agent
  • Double-long-chain alkyl hydroxy sulfobetaine surfactant and oil-displacing agent

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Embodiment 1

[0022] This embodiment provides a kind of didodecyl methyl hydroxy sultaine, which is prepared through the following steps:

[0023] Make didodecylmethyl tertiary amine and sodium trichlorodihydroxypropanesulfonate react in the presence of NaOH, the reaction medium is a mixed solution of water and isopropanol (the volume ratio of water to isopropanol is 1:1, The molar ratio of water to di-long-chain methyl tertiary amine is 30:1), the reaction temperature is 80°C, the molar ratio of sodium trichlorodihydroxypropanesulfonate to didodecyl methyl tertiary amine is 1.2:1, The molar ratio of NaOH to sodium trichlorodihydroxypropanesulfonate is 1:1.2, the reaction time is 8 hours, the unreacted didodecylmethyl tertiary amine is washed away with petroleum ether, the solvent is separated after the reaction is completed, and the product is washed with ethanol , the ethanol was distilled off to obtain the final product as a white solid.

[0024] The product was subjected to infrared an...

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Abstract

The invention relates to a double-long-chain alkyl hydroxy sulfobetaine surfactant and an oil-displacing agent. The structural formula of the double-long-chain alkyl hydroxy sulfobetaine surfactant is described in the specification, and the oil-displacing agent further comprises the double-long-chain alkyl hydroxy sulfobetaine surfactant. The oil-displacing agent prepared from the double-long-chain alkyl hydroxy sulfobetaine surfactant has the effect of reducing the interface tension between crude oil and water to the ultra low degree in the alkali-free condition.

Description

technical field [0001] The invention relates to a double-long-chain alkyl hydroxy sultaine surfactant and an oil-displacing agent, belonging to the technical field of oil-displacement for petroleum exploitation. Background technique [0002] Before the 1940s, almost all oil reservoirs were exploited by their own energy, that is, the so-called primary oil recovery. The recovery rate of primary oil recovery is low, and the oil recovery rate is also low. In order to further increase the recovery rate, artificial water injection is usually used to replenish energy to the formation, that is, secondary oil recovery. After the primary and secondary oil recovery, there is still a large amount of crude oil in the pores of the formation, so it is necessary to carry out tertiary oil recovery. Chemical flooding is one of the key research directions of tertiary oil recovery, and surfactant is one of the commonly used chemical flooding agents. Studies have shown that when the interfaci...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C09K8/584C07C309/14C07C303/32
Inventor时昌新刘卫东
OwnerPETROCHINA CO LTD