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Composite demulsifier for oil-water transition layer and application of composite demulsifier

A composite demulsification and transition layer technology, applied in the field of oilfield chemistry, can solve the problems of ineffective separation of oil and water, inability to form a clear oil-water interface, and ineffective demulsification effect

Pending Publication Date: 2021-09-07
四川科宏达集团有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to solve the problem that when the existing demulsifier is applied to the oil-water transition layer of the multiple emulsion structure wrapped layer by layer, the demulsification effect is not obvious, a clear oil-water interface cannot be formed, and oil-water cannot be effectively separated. A composite demulsifier for an oil-water transition layer and its application. The demulsifier of the invention has the characteristics of simple compounding process, common and easy-to-obtain raw materials, obvious demulsification and oil washing effect, clear oil-water separation interface, and thorough dehydration.

Method used

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Examples

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Effect test

Embodiment 1

[0027] A composite demulsifier for oil-water transition layer, composed of component A and component B with a mass ratio of 2:1, wherein:

[0028] Component A: Dissolve 20 parts of polyamide with 15 parts of mixed alcohol to form a liquid, dissolve 15 parts of cetyl dimethyl betaine and 10 parts of cetyl dimethyl amine oxide with 15 parts of mixed alcohol to form a liquid , mix the liquid evenly, add 25 parts of mixed alcohol and stir evenly to form component A; the mixed alcohol is mixed with ethanol, ethylene glycol and propylene glycol in a volume ratio of 5:5:4;

[0029] Component B: Stir 18 parts of octylphenol polyoxyethylene ether, 15 parts of alkyl glycoside and 67 parts of aqueous methanol to form component B.

Embodiment 2

[0031] A composite demulsifier for oil-water transition layer, composed of component A and component B with a mass ratio of 2:1, wherein:

[0032] Component A: Dissolve 18 parts of polyamide with 15 parts of mixed alcohol to form a liquid, dissolve 13 parts of oil octadecyl dimethyl betaine and 7 parts of octadecyl dimethyl amine oxide with 15 parts of mixed alcohol to form Liquid, mix the liquid evenly, add 32 parts of mixed alcohol and stir evenly to form component A; the mixed alcohol is methanol, propylene glycol, and glycerin mixed in a volume ratio of 3:2:2;

[0033] Component B: Compound 15 parts of nonylphenol polyoxyethylene ether, 13 parts of alkyl glycoside and 72 parts of ethanol and stir evenly to form component B.

Embodiment 3

[0035] A composite demulsifier for oil-water transition layer, composed of component A and component B with a mass ratio of 2:1, wherein:

[0036] Component A: Dissolve 16 parts of polyamide with 15 parts of methanol to form a liquid, dissolve 20 parts of hexadecyl / octadecyl dimethyl betaine and 15 parts of oleic amidopropylamine oxide with 15 parts of methanol to form a liquid, Mix the liquid evenly, add 19 parts of methanol and stir evenly to form component A;

[0037] Component B: Mix 13 parts of polyoxyethylene-polyoxypropylene copolymer, 10 parts of alkyl glucoside, and 76 parts of ethanol and ethylene glycol (volume ratio 1:1) and stir evenly to form component B.

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Abstract

The invention belongs to the technical field of oilfield chemistry, and discloses a composite demulsifier for an oil-water transition layer. The composite demulsifier is composed of a component A and a component B in a mass ratio of 2: 1, the component A is composed of polyamide, a long-chain betaine surfactant, a long-chain amine oxide surfactant and a solvent, and the component B consists of a polyether type nonionic surfactant, an alkyl glycoside surfactant and a solvent. The composite demulsifier disclosed by the invention is suitable for a thicker oil-water transition layer after thick oil and super-thick oil emulsion is subjected to primary demulsification in a crude oil produced liquid combined treatment station, secondary demulsification cannot be completed by a single demulsifier component or a conventional polyether demulsifier, and the composite demulsifier disclosed by the invention does not need to be additionally provided with a stirring and mixing device in a use process; after 1%-2% of a demulsifier is added through a transfer pump, standing is performed for 10-30 min, and the demulsifier can be automatically demulsified into an oil phase and a water phase.

Description

technical field [0001] The invention belongs to the technical field of oilfield chemistry, and relates to a composite demulsifier used for an oil-water transition layer and an application thereof. Background technique [0002] With the continuous exploitation of crude oil in my country and the continuous development of oil recovery technology, the proportion of heavy oil and super heavy oil in the produced oil is increasing, and the produced fluid is mostly crude oil emulsion. A large number of surfactants with different structures and functions will be introduced in the process of acid fracturing and chemical flooding in the process of heavy oil production. At the same time, heavy oil and super heavy oil also have a large number of surface active components at the reservoir temperature, resulting in After primary demulsification of heavy oil and ultra-heavy oil production fluid, the oil-water interface is very unclear, and there is a thick oil-water transition layer. A lay...

Claims

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Application Information

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IPC IPC(8): C10G33/04
CPCC10G33/04
Inventor 李纪晖吕俊华车国勇艾加伟张豫红
Owner 四川科宏达集团有限责任公司