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Crude oil surface active agent as well as preparation method and application thereof

A technology of surfactants and crude oil, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of low-permeability oil reservoirs, such as cost reduction and unsatisfactory protection, so as to reduce adhesion work and increase production efficiency , The effect of simple preparation process

Active Publication Date: 2015-03-25
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In terms of improving oil washing efficiency, the currently used surfactant compound system needs to be used under the condition of low alkali or high concentration to form ultra-low interfacial tension with crude oil, which cannot meet the requirements of protecting medium and low permeability reservoirs and reducing costs. need

Method used

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  • Crude oil surface active agent as well as preparation method and application thereof
  • Crude oil surface active agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Prepare according to the following steps on the basis of 100% of the surfactant gross weight prepared:

[0042] 1. First, add 1% fatty acid diethanolamide into water to dissolve, and stir with a stirrer at a speed of 800r / min to fully mix it with water.

[0043] 2. After stirring evenly, add 5% polyoxyethylene fatty acid amide in turn (preparation method: 1. Use oleic acid and diethanolamine (molar ratio: 2:5) to react at a reaction temperature of 140-150°C for 3 hours to obtain oil Acid diethanolamide; 2. Use oleic acid diethanolamide and ethylene oxide (molar ratio 1:3.5) to react for 4 hours at a reaction temperature of 160-180°C to obtain polyoxyethylene fatty acid amide. Performance parameters: average Molecular weight: 500, density 1.029g / cm 3, 0.1% surface tension 28.9mN / m) and 10% heptadecyl dimethyl betaine, fully stirred for 60 minutes to form a surfactant complex solution.

[0044] Laboratory tests show that the surfactant compound solution can form 10% wit...

Embodiment 2

[0047] 1. First, add 1% fatty acid diethanolamide into water to dissolve, and stir with a stirrer at a speed of 800r / min to fully mix it with water.

[0048] 2. After stirring evenly, add 10% polyoxyethylene fatty acid amide (prepared according to Example 1) and 20% heptadecyldimethyl betaine respectively in sequence, and stir fully for 100 minutes to form a surfactant compound solution.

[0049] Laboratory tests have shown that the surfactant compound solution can form 10% dehydrated crude oil with crude oil at 45°C in the concentration range of 0.0085% for Hainan 3 blocks of dehydrated crude oil. -3 ~10 -4 Ultra-low interfacial tension of mN / m.

Embodiment 3

[0051] 1. First, add 1.5% fatty acid diethanolamide into water to dissolve, and stir with a stirrer at a speed of 800r / min to fully mix it with water.

[0052] 2. After stirring evenly, add 8% polyoxyethylene fatty acid amide (prepared according to Example 1) and 16% heptadecyl dimethyl betaine successively respectively, and fully stir for 100 minutes to form a surfactant compound solution.

[0053] Laboratory tests have shown that the surfactant compound solution can form 10% dehydrated crude oil with crude oil at 45°C in the concentration range of 0.0082% for Hainan 3 blocks of dehydrated crude oil. -3 ~10 -4 Ultra-low interfacial tension of mN / m.

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Abstract

The invention relates to a crude oil surface active agent as well as a preparation method and an application thereof. The crude oil surface active agent comprises the following components in percentage by weight under an alkali-free condition: 1%-2% of fatty acid diethanol amide, 5%-10% of polyoxyethylene fatty acid amide, 10%-20% of heptadecyl dimethyl betaine and the balance of water, wherein the compounding weight ratio of the polyoxyethylene fatty acid amide to the heptadecyl dimethyl betaine is 1:2. A surface active agent compound system can form the ultra-low interfacial tension of 10<-3>-10<-4> mN / m with stratum dewatered crude oil at 45 DEG C when the use concentration is 0.0075%-0.01% under the alkali-free condition. In addition, the surface active agent compound system is less influenced by stratum water salinity, achieves the adsorption quantity on three oil sands of in the Liaohe oilfield Hainan less than 0.5 mg / g, is suitable for a mono-system flooding or binary system flooding technology adopted in the middle and later period of the waterflooding development of an oil deposit and provides certain technical support for the tertiary oil recovery of an oilfield.

Description

technical field [0001] The invention relates to the petroleum field, in particular to a crude oil surfactant and a preparation method and application thereof. Background technique [0002] In recent years, major oilfields have successively entered the later stage of production, and the recovery rate of water flooding is generally low, and the water content of crude oil is relatively high. Fingering along the high-permeability channels leads to poor water flooding effect and poor development of low-permeability oil layers. [0003] The third Hainan block of Liaohe Oilfield Shallow Sea Petroleum Development Company belongs to medium and low permeability reservoirs, which have the characteristics of high crude oil viscosity and strong formation heterogeneity. To solve this kind of problem, it is necessary to consider two aspects of improving the reservoir sweep coefficient and oil washing efficiency. In terms of improving oil washing efficiency, the currently used surfactant ...

Claims

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Application Information

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IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 刘占广安志杰李文军李友富浦家康孙倩茹张玉涛刘畅李德胜徐爽周广安熊梅王雪梅王喜泉孙福群
Owner PETROCHINA CO LTD
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