Binary composite flooding system and application thereof

A binary compound flooding and compound oil flooding technology, which is applied in the fields of production fluids, drilling compositions, wellbore/well components, etc. Strong and excellent compatibility

Active Publication Date: 2015-07-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The adaptability of conventional petroleum sulfonates to different oilfield conditions is not ideal

Method used

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  • Binary composite flooding system and application thereof
  • Binary composite flooding system and application thereof
  • Binary composite flooding system and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This example is used to illustrate the preparation method of the oil flooding surfactant of the present invention.

[0029] Furfural refined extract oil (aromatics content 75% by mass) and delayed coking distillate (boiling range 180-380°C, olefin content 27 mass%, aromatics content 23 mass%) were mixed so that the mass ratio of olefins to aromatics in the mixture was 1 : 5, add aluminum trichloride (consumption is 1 / 15 of raw material gross mass), react at 60 ℃ after 2 hours, filter out catalyst with Buchner funnel; Filtrate is transferred in the container, while stirring Add oleum dropwise, the oleic acid ratio is 1.25: 1 (ratio of the total mass of raw material oil to the mass of oleum), after reacting for 4 hours at 50°C, add dropwise a NaOH solution with a mass concentration of 20%, and dissolve the oil The pH value was adjusted to 7-8, and the product was transferred to a separatory funnel to separate the water layer to obtain the product. The product composition ...

Embodiment 2

[0033] This example is used to illustrate the preparation method of the oil flooding surfactant of the present invention.

[0034] The dewaxed oil (aromatics content 50% by mass) of the furfural refining extract oil is mixed with the delayed coker diesel fraction (olefin content 12 mass%, aromatics content 37 mass%), so that the mass ratio of olefins and aromatics in the mixture is 1:8, Add aluminum trichloride (the amount is 1 / 15 of the total mass of raw materials), react at 50°C for 2 hours, filter out the catalyst with a Buchner funnel; Fuming sulfuric acid, oleic acid ratio is 1.25: 1 (ratio of raw material oil total mass and fuming sulfuric acid quality), after reacting at 70 ℃ for 4 hours, add dropwise the ammoniacal solution that mass concentration is 25%, the pH value of oil liquid Adjust to 7-8, transfer the neutralized product to a separatory funnel for static liquid separation to obtain the product.

Embodiment 3

[0036] This example is used to illustrate the preparation method of the oil flooding surfactant of the present invention.

[0037] Mix vacuum distillate oil (31.68% by mass aromatics content) with delayed coking distillate (boiling range 90-220°C, 35% by mass olefin content, 11% by mass aromatics content), so that the mass ratio of olefins to aromatics in the mixture is 1 : 10, add aluminum trichloride (consumption is 1 / 15 of raw material gross mass), react at 80 ℃ after 2 hours, filter out catalyst with Buchner funnel; Filtrate is transferred in the container, while stirring Add dropwise oleum, the oleic acid ratio is 1.5: 1 (ratio of the total mass of raw material oil to the mass of oleum), after reacting for 4 hours at 60°C, add dropwise a NaOH solution with a mass concentration of 20%, and the oil The pH value is adjusted to 7-8, and the neutralized product is transferred to a separatory funnel for static liquid separation to obtain the product.

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Abstract

The invention relates to a binary composite flooding system and an application thereof. The composite flooding system comprises, by mass, 0.05-0.6% of a surfactant, 0.1-0.3% of a flooding-use polymer, and a major amount of water. The surfactant is prepared through the steps that: petroleum distillate oil is subjected to an alkylation treatment and a sulfonation treatment, and is neutralized by using alkali, such that the surfactant is obtained. With the binary composite flooding system provided by the invention, crude oil recovery rate can be greatly improved under an alkali-free condition.

Description

technical field [0001] The invention relates to a binary composite oil flooding system comprising a polymer and a surfactant and its application in enhancing oil recovery. Background technique [0002] The exploitation of oil is divided into three stages: at first, it relies on the natural energy of the strata to extract oil, which is called primary oil recovery, and the general recovery rate is 5% to 10%; after the natural energy is exhausted, it can be continued by artificial water injection or gas injection. Exploitation is called secondary oil recovery, and the recovery rate can be increased to 30% to 40%; after secondary oil recovery, there are still 60% to 70% of the remaining oil remaining in the ground, which can only be exploited by physical and chemical methods. called tertiary oil recovery. Tertiary oil recovery methods mainly include thermal flooding, miscible flooding, chemical flooding and microbial flooding. [0003] Chemical flooding is a series of physical...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/588E21B43/22
Inventor 李伟李本高王秀
Owner CHINA PETROLEUM & CHEM CORP
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