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Oil displacement surfactant system as well as preparation method and application thereof

A surfactant and oil displacement technology, which is applied in the field of oil displacement surfactant system and its preparation, can solve the problem of oil displacement performance of rare alkyl glycoside surfactant micellar system, high cost of surfactant, uneconomical, etc. problems, to achieve excellent stability, promote displacement and dissolution, and low surface tension

Active Publication Date: 2021-09-24
NANHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, most of the research on the alkyl glycoside surfactant oil displacement fluid system in the above-mentioned prior art focuses on optimizing the structure of the surfactant or the combination with other surfactants, and the cost of the surfactant is relatively high, which is not economical.
At the same time, there are few researches and optimizations on the oil displacement performance of the alkyl glycoside surfactant micellar system.

Method used

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  • Oil displacement surfactant system as well as preparation method and application thereof
  • Oil displacement surfactant system as well as preparation method and application thereof
  • Oil displacement surfactant system as well as preparation method and application thereof

Examples

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preparation example Construction

[0037] The invention provides a kind of preparation method of oil displacement surfactant system, comprises the steps:

[0038] P1, add surfactant, esterification aid, and inorganic salt into 100g of water according to the mass ratio of (0.2~2)g:(0.1~1)g:(0.05~0.5)g to obtain a mixed solution, and conduct ultrasonic Treat for 20-30 minutes;

[0039] P2, the ultrasonically treated mixed solution is subjected to high-speed shearing treatment at 30-50° C. for 6-10 hours to prepare a micellar oil displacement surfactant system.

[0040] Preferably, the high-speed shearing speed is 300-600 r / min.

[0041] Preferably, the synthesis route of the esterification auxiliary agent is as follows:

[0042] S1, using chiral carvalolactone as raw material, adjusting the pH value to acidity, and then in KMnO 4 Ring opening under action gives chiral cyclopropanedicarboxylic acid:

[0043]

[0044] S2, the esterification reaction of chiral cyclopropanedicarboxylic acid and chiral phenyl g...

Embodiment 1

[0049] Embodiment 1 of the present invention provides an oil displacement surfactant system, which is a micellar composite flooding system with a particle size of less than 50 nm composed of alkyl glycoside surfactants, esterification aids, inorganic salt sodium chloride and water. Oil agent;

[0050] Wherein, the preparation process of esterification auxiliary agent is as follows:

[0051] S1, under the condition of constant mechanical stirring, add 24g of carvalolactone and 300g of water into the beaker, then adjust the pH value of the solution to 2 with concentrated sulfuric acid; then add the total amount of 37.5g in three times at 0°C KMnO 4 , naturally warming to room temperature, continue to stir the reaction for 12h, filter, and the filtrate is washed with 10% K 2 CO 3 Adjust the pH value to 8-9, wash the water phase with 100mL diethyl ether, adjust the pH value of the water phase to 2-3 with concentrated sulfuric acid, extract with anhydrous diethyl ether, wash wit...

Embodiment 2-6

[0064] The difference from Example 1 is that the ratio of raw materials in the oil displacement surfactant micelle system is set differently, as shown in Table 1.

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Abstract

The invention provides an oil displacement surfactant system as well as a preparation method and application thereof. The oil displacement surfactant system is a micelle-shaped composite oil displacement agent composed of a surfactant, an esterification auxiliary agent, inorganic salt and water, wherein the surfactant is alkyl glycoside or a derivative of alkyl glycoside; and the esterification auxiliary agent is a chiral esterification product obtained by carrying out esterification reaction on chiral cyclopropane dicarboxylic acid and chiral phenyl glycol. The preparation method comprises the steps of proportionally adding the surfactant, the esterification auxiliary agent and the inorganic salt into water to obtain a mixed solution, and carrying out ultrasonic and high-speed shearing treatment to prepare the micelle-shaped oil displacement surfactant system which has excellent stability and lower surface tension and can penetrate into small pore throat cracks, so that displacement and dissolution of crude oil in pore throat cracks can be better promoted, and the technical problem that a large amount of residual crude oil cannot act with an oil displacement system due to the fact that the viscosity of the crude oil is large and the pore throat cracks are prone to being blocked is solved.

Description

technical field [0001] The invention relates to the technical field of oilfield exploitation, in particular to an oil displacement surfactant system and its preparation method and application. Background technique [0002] Petroleum is an important non-renewable strategic resource in the world. At present, most of my country's oilfields have entered the late stage of oilfield development. The oil produced by water flooding has the characteristics of high water content, which greatly reduces the economic benefits of oilfield development. Chemical flooding has played a great role in improving oil recovery efficiency in the late stage of oilfield development. Surfactant flooding in chemical flooding is the most promising tertiary oil recovery technology. The working principle of surfactant is to reduce the oil-water interfacial tension, Changing the wettability of rocks improves oil recovery. [0003] In recent years, many achievements have been made in the research and applic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C07D321/12
CPCC09K8/584C07D321/12
Inventor 张雷彭怀德戴兵刘永
Owner NANHUA UNIV
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