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Dehydrated demulsifier of crude oil extraction from thick oil pool

A technology for dehydration of heavy oil reservoirs and crude oil is applied in the field of preparation of demulsifiers for polymer flooding crude oil in heavy oil reservoirs, and can solve the problems of difficult sewage treatment and high cost of crude oil dehydration treatment

Active Publication Date: 2007-04-25
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in this way, not only the cost of crude oil dehydration treatment is high, but at the same time, it has caused great difficulties to sewage treatment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. Preparation of Surfactant A

[0025] First, put 45% by weight tetraethylenepentamine as the starting agent in the preparation of intermediate PEA in a stainless steel reactor, start stirring, heat up to 120±5°C, evacuate, fill with nitrogen, and slowly add dropwise over 1.5 hours The weight ratio is 55% propylene oxide. The reaction pressure is controlled at 0.15-0.45MPa, and the dripping is completed. After the pressure in the reactor returns to zero, the temperature is lowered and the material is discharged to obtain the intermediate PEA.

[0026] Put the intermediate PEA with the weight ratio of 65% and the sodium hydroxide with the weight ratio of 0.15% in the stainless steel reactor for preparing A surfactant, start stirring, heat up to 130±5℃, evacuate and fill with nitrogen, use 1.2 32.85% by weight of ethylene oxide was slowly added dropwise in hours, and then 2% by weight of epichlorohydrin was slowly added dropwise in 0.3 hours. The reaction pressure was contro...

Embodiment 2、3、4

[0036] The preparation process of Examples 2, 3, and 4 of the dehydration demulsifier for heavy oil reservoir polymer flooding crude oil production fluid is basically the same as that of Example 1, except for the formula. The formulations of Examples 1-4 prepared by the dehydration demulsifier for crude oil production fluid in heavy oil reservoirs are expressed in a tabular format, and the list is as follows:

[0037] Table 1: Preparation formula of dehydration demulsifier for heavy oil reservoir polymer flooding crude oil production fluid

[0038] Item

Dry agent C weight ratio%

Water weight ratio%

Example 1

50

50

Example 2

43

57

Example 3

52

48

Example 4

62

38

[0039] Table 2: Formula of Dry Agent C

[0040]

Item

A surfactant

Surfactant B

N-Ethyl Perfluorooctyl Sulfonyl

Amine polyoxyethylene ether

Exa...

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PUM

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Abstract

The invention relates to a kind of dehydrator and emulsion-breaker as well as its preparing method. The characteristic of the invention includes: preparing two kinds of surface active agent; putting the active agents, N-ethyl perfluoro-octyl sulfamine polyoxyethylene ether into the reactor by turns, reacting at a certain temperature for some time to get a dry agent; putt the dry agent into the mixing caldron and dropping water into the caldron slowly to get the dehydrator and emulsion-breaker, the demulsificating and dehydrating effect is better than the present emulsion-breaker. The dehydrating process uses less dehydrator and emulsion-breaker; after the process, the water content of the crude oil is less than 0.2% which can fulfill the water content request; the oil content in the waste liquid has decreased from 20% to less than 50mg / l.

Description

Technical field [0001] The invention relates to a method for preparing a demulsifier for heavy oil reservoir polymer flooding crude oil production fluid dehydration demulsifier for heavy oil reservoir polymer flooding crude oil. Background technique [0002] In order to solve the problem that the crude oil meets the standard of high-quality oil for export after dehydration, the sewage after dewatering meets the standard, and reduces the cost of demulsification and dehydration of crude oil, technicians have developed many types of demulsifiers in response to technical problems on site. Many crude oil demulsification and dehydration problems have been solved, but some technical problems have been ignored. For example, after polymer flooding in heavy oil reservoirs, the produced fluid containing polymer is demulsified and dehydrated, and the oil content in the sewage is very high. How to solve this problem? [0003] In order to improve the oil layer sweep coefficient in the later st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G33/00
Inventor 付亚荣蔡远红马永忠田炜刘建华李冬青
Owner PETROCHINA CO LTD
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