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Foam flooding agent

A technology of foam oil displacement and surfactant, applied in the field of foam oil displacement agent, can solve the problems of decreased permeability, environmental damage, serious crude oil emulsification, etc. Effect

Active Publication Date: 2012-11-07
天津市瑞德赛恩新材料开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the formula uses alkali, which is likely to cause problems such as clogging of the oil layer and decrease in permeability. Moreover, the crude oil is seriously emulsified, and it is difficult to separate the oil and water of the produced fluid, which brings difficulties to the downstream refining.
In addition, the ingredients selected by many foam oil displacement agents are not environmentally friendly, and if they seep into groundwater, they will cause great harm to the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In the stirred tank, add 200Kg of sodium polyalkylbenzene sulfonate, add 150Kg of water and stir evenly, heat up to 50°C, add 50Kg of sodium tridecyl polyoxyethylene ether carboxylate, and then add 50Kg of tetrakis hydroxymethyl phosphorus sulfate, Stir well and serve.

[0037] The oil displacing agent of Example 1 was subjected to a fog film test, and the results are shown in the following table, including two parallel experiments.

[0038]

[0039] In addition, compared with other existing foam oil displacement agents, the oil displacement agent of this example has a foam half-life of 400 minutes at 50°C and a foam volume of 330 mL. It has good compatibility with other surfactants, and the indoor simulation improves the recovery by more than 15%.

Embodiment 2

[0041] Add component A: polyalkylbenzene sulfonate sodium 200Kg into the reaction kettle, add water 215Kg, stir evenly, add component B: tridecyl polyoxyethylene ether carboxylate sodium 50Kg and component D Tween 35K g Stir well and serve.

Embodiment 3

[0043] Add 200Kg of component A sodium polyalkylbenzene sulfonate into the reaction kettle, add 250Kg of component water, stir evenly, add 50Kg of component B cocamidopropyl betaine, stir evenly, and obtain.

[0044] The R of the polyalkylbenzene sulfonate sodium that above-mentioned embodiment 1-3 selects for use 3 for C 4 h 9 , R 2 for C 7 h 15 , R 1 for C 7 h 15 .

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Abstract

The invention provides a foam flooding agent which comprises the following components in parts by weight: 30-60 parts of A polyalkylsodium benzenesulfonate, 5-15 parts of B surfactant, 0-15 parts of C tetrakis(hydroxymethyl)phosphonium sulfate, 5-10 parts of D tween-20 and 25-55 parts of E water. The invention has the following advantages: 1. the activity is high, so the oil-water interface surface tension can be lowered without adding alkali; 2. the foam flooding agent can resist high temperature and high salt, can not be decomposed at 220 DEG C, and can resist total ion concentration; and 3. compared with other existing foam flooding agents, the 50 DEG C half life period of foam is up to 400 minutes, the foam volume is 330mL, and the foam flooding agent has favorable compatibility with other surfactants and enhances the oil recovery rate by 15% in laboratory simulation.

Description

technical field [0001] The invention relates to a foam oil displacement agent in oil exploitation. Background technique [0002] In order to improve oil drilling and recovery rate, chemical oil displacement agents are usually used in oil recovery, and foam oil displacement agents are an important research direction. Chinese invention CN1093589 has recorded a kind of foam composite oil displacement method, selects the aqueous solution of surfactant, alkali, polymer as oil displacement agent, wherein alkali 0.5%-1.5%, surfactant 0.05%-0.5%, polymer 0.05% -0.5%, both in weight ratio, can increase oil recovery by 25%-30%. However, the formula uses alkali, which is likely to cause problems such as clogging of the oil layer and decrease in permeability. Moreover, the crude oil is severely emulsified, and it is difficult to separate the oil and water of the produced fluid, which brings difficulties to the downstream refining. In addition, the ingredients selected by many foam oil...

Claims

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Application Information

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IPC IPC(8): C09K8/584
Inventor 吴国熙付春生
Owner 天津市瑞德赛恩新材料开发有限公司
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