Application method of crude oil composite demulsifier

A compound demulsifier and compound demulsifier technology are applied in the field of crude oil compound demulsifiers, which can solve the problems of large usage of demulsifiers and inability to achieve ideal demulsification effects, and achieve the effects of improving dehydration effect, stable quality and reducing usage.

Inactive Publication Date: 2016-08-31
CHENGDU GAOPU PETROLEUM ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: the existing demulsifier is used in a large amount, and there is still a problem that the ideal demulsification effect cannot be achieved, and a method for using a crude oil composite demulsifier that solves the above problems is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for using a crude oil compound demulsifier, comprising:

[0023] Step 1, prepare crude oil composite demulsifier, the crude oil composite demulsifier includes 48~52wt% polyoxyethylene polyoxypropylene block polyether, 0.8~1.2wt% sodium cetyl sulfonate, 2~5wt% Lauryl amidopropyl betaine, 10-15 wt% of C2-C6 carboxylic acid, and the rest is water.

[0024] The concrete preparation steps of described crude oil composite demulsifier are:

[0025] Step 1.1, adding C2-C6 carboxylic acid to water, and then adding polyoxyethylene polyoxypropylene block polyether under stirring conditions to prepare a mixed solution;

[0026] Step 1.2, heating the mixed solution to 30-50°C, adding sodium cetylsulfonate during the heating process;

[0027] In step 1.3, after the temperature reaches 30-50° C., add lauryl amidopropyl betaine and mix evenly.

[0028] Step 2, adding the crude oil compound demulsifier into the crude oil in an amount of 10-15 ppm.

[0029] In this embodimen...

Embodiment 2

[0031] The difference between this example and Example 1 is that the C2-C6 carboxylic acid in this example is citric acid.

Embodiment 3

[0033] The difference between this example and Example 1 is that the C2-C6 carboxylic acid in this example is glutaric acid and citric acid with a weight ratio of 1:2.

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PUM

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Abstract

The invention discloses an application method of a crude oil composite demulsifier. The problems that an existing demulsifier is large in use quantity and cannot achieve an ideal demulsifying effect are solved. The method comprises the steps that 1, the crude oil composite demulsifier is prepared, wherein the crude oil composite demulsifier contains 48-52 wt% of polyoxyethylene polyoxypropylene block polyether, 0.8-1.2 wt% of sodium hexadecyl sulfonate, 2-5 wt% of lauramidopropyl betaine, 10-15 wt% of C2-C6 carboxylic acid and the balance water; 2, the crude oil composite demulsifier is added into crude oil according to the adding quantity of 5-10 ppm. The application method has the advantages that the dewatering effect can be effectively improved while the use quantity is reduced.

Description

technical field [0001] The invention relates to a method for using a demulsifier, in particular to a method for using a composite demulsifier for crude oil. Background technique [0002] At present, when crude oil is exploited in offshore oilfields and enters the later stage of exploitation, as the water content continues to increase, it becomes turbid like mud, and the clay content reaches about 5%. Because the clay has a small particle size and a large surface area, the adsorption capacity is very high. Strong, in the formation crude oil reservoir, with the stirring of the oil production pump during the production process, a layer of crude oil will be wrapped on the surface of the particles, and then a new emulsification system will be formed, which is called "oil mineral aggregate structure" (oil mineral aggregate structure). aggregates, OMA). When the emulsification system of this structure enters the crude oil processing system, the oil-water interface in the separator...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G33/04
CPCC10G33/04
Inventor 周斌
Owner CHENGDU GAOPU PETROLEUM ENG TECH
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