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Dehydrated demulsifier of crude oil extraction from thick oil pool

A technology for heavy oil reservoirs and produced fluids, which is applied in the fields of hydrocarbon oil dehydration/demulsification, petroleum industry, etc., and can solve problems such as difficult sewage treatment and high cost of crude oil dehydration treatment

Active Publication Date: 2009-07-15
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] One, the preparation of A surfactant

[0025] First, place tetraethylenepentamine with a weight percentage of 45% of the intermediate PEA as the starting agent in a stainless steel reactor, start stirring, heat up to 120±5°C, evacuate, fill with nitrogen, and slowly add it dropwise over 1.5 hours 55% propylene oxide by weight. The reaction pressure is controlled at 0.15-0.45 MPa. After the dropwise addition 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] The intermediate PEA with a weight ratio of 65% and the sodium hydroxide with a weight ratio of 0.15% are placed in a stainless steel reaction kettle to prepare A surfactant, and the temperature is raised to 130 ± 5 ° C, evacuated and filled with nitrogen. Use 1.2 Slowly add ethylene oxide with a weight ratio of 32.85% in one hour, and then slowly add epichlorohydrin with a weight ratio of 2% in 0.3 hours...

Embodiment 2、3、4

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

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

[0038] project Dry agent C weight % Water weight % Example 1 50 50 Example 2 43 57 Example 3 52 48 Example 4 62 38

[0039] Table 2: Formulation of dry agent C

[0040]

project

A surfactant

B surfactant

N-Ethyl perfluorooctanesulfonyl

Amine polyoxyethylene ether Example 1 50 49 1 Example 2 45....

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Abstract

A dehydration demulsifier for produced fluid after polymer flooding in heavy oil reservoirs and a preparation method thereof. It is characterized in that: firstly prepare two kinds of surfactants respectively, and then place the two kinds of surfactants and N-ethyl perfluorooctyl sulfonamide polyoxyethylene ether in a reaction kettle in sequence and react at a certain temperature for a period of time to obtain A dry agent, finally put the dry agent in a mixing tank and slowly add water dropwise to obtain a demulsifier for crude oil dehydration of polymer flooding in heavy oil reservoirs. Its demulsification and dehydration effect is better than that of existing demulsifiers. In the dehydration of crude oil, the amount of dehydration demulsifier for crude oil produced by polymer flooding in heavy oil reservoirs is small, the water content of crude oil after dehydration is less than 0.2%, and the oil content of sewage is less than 50mg / l. The water content after the crude oil is removed meets the requirements; the oil content in the sewage is reduced from more than 20% to less than 50mg / l.

Description

Technical field [0001] The invention relates to a dehydration demulsifier for heavy oil reservoir polymer flooding crude oil production fluid, and a preparation method of the demulsifier for heavy oil reservoir polymer flooding crude oil. Background technique [0002] In order to meet the standard of high-quality oil for export after dehydration of crude oil, meet the standard of sewage after dehydration, and reduce the cost of demulsification and dehydration of crude oil, technicians have developed many types of demulsifiers for on-site technical problems. 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 oil content in sewage is very high after the polymer-containing produced fluid is demulsified and dehydrated. How should it be solved? [0003] In order to improve the sweep coefficient of the oil layer in the late stage of oilfield devel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G33/00
Inventor 付亚荣李冬青付丽霞田炜马永忠刘建华蔡远红
Owner PETROCHINA CO LTD
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