High-temperature-resistant and low-tension foam flooding agent and preparation method thereof

A foam flooding and low tension technology, applied in the field of foam oil flooding agent, can solve the problems of poor high temperature resistance, limited application, poor compatibility, etc., and achieve the effects of increasing cost, good foam stability and strong foaming ability

Inactive Publication Date: 2014-07-23
GASOLINEEUM EXPLORATION DEELOPMENT INST OF HENAN OILFIELD BRANCH SINOPEC +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For high-temperature oil reservoirs, when using anionic foam agent alone, the compatibility of anionic foam agent and formation water is poor, and it is easy to form precipitation with calciu...

Method used

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  • High-temperature-resistant and low-tension foam flooding agent and preparation method thereof
  • High-temperature-resistant and low-tension foam flooding agent and preparation method thereof
  • High-temperature-resistant and low-tension foam flooding agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] raw material:

[0025]

[0026] Preparation method: Add 50Kg of water into the reaction kettle, at a temperature of 30°C, add 40Kg of octylphenol polyoxyethylene ether carboxylate sodium salt and 17Kg of tetradecylsulfonic acid sodium salt, and stir; to be reacted After the sodium salt of octylphenol polyoxyethylene ether carboxylate and sodium tetradecyl sulfonate in the still are dissolved, add 5Kg of sodium chloride and the remaining 26Kg of water, stir and mix well to obtain light yellow transparent High temperature low tension foam oil displacing agent.

[0027] The high-temperature-resistant low-tension foam oil-displacing agent prepared above does not decompose at a high temperature of 250° C.

[0028] Use the above-mentioned high-temperature-resistant low-tension foam oil-displacement agent prepared above and the aqueous solution of the described high-temperature-resistant low-tension foam oil-displacement agent with a concentration of 0.4wt% to carry out la...

Embodiment 2

[0031] raw material:

[0032]

[0033]Preparation method: Add 50Kg of water into the reaction kettle, add 50Kg of sodium dodecylphenol polyoxyethylene ether sulfonate and 15Kg of sodium hexadecylsulfonate at a temperature of 35°C, and stir; After the dodecylphenol polyoxyethylene ether sulfonic acid sodium salt and hexadecyl sulfonic acid sodium salt in the reaction kettle are dissolved, add 8Kg of sodium chloride and the remaining 25Kg of water, stir and mix well to obtain the light Yellow transparent high temperature resistant low tension foam oil displacing agent.

[0034] The high-temperature-resistant low-tension foam oil-displacing agent obtained above does not decompose at a high temperature of 250° C.

[0035] Use the above-mentioned high-temperature-resistant low-tension foam oil-displacement agent prepared above and the aqueous solution of the described high-temperature-resistant low-tension foam oil-displacement agent with a concentration of 0.4wt% to carry out ...

Embodiment 3

[0038] raw material:

[0039]

[0040] Preparation method: Add 78Kg of water into the reaction kettle, and at a temperature of 30°C, add 70Kg of nonylphenol polyoxyethylene ether carboxylate sodium salt and 28Kg of sodium tetradecylsulfonate sodium salt, and stir; After dissolving the sodium salt of nonylphenol polyoxyethylene ether carboxylate and sodium tetradecyl sulfonate in the reaction kettle, add 10Kg of sodium chloride and the remaining 39Kg of water, stir and mix well to obtain light yellow and transparent High temperature resistant low tension foam oil displacing agent.

[0041] The high-temperature-resistant low-tension foam oil-displacing agent obtained above does not decompose at a high temperature of 250° C.

[0042] Use the above-mentioned high-temperature-resistant low-tension foam oil-displacement agent prepared above and the aqueous solution of the described high-temperature-resistant low-tension foam oil-displacement agent with a concentration of 0.4wt% ...

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Abstract

The invention relates to a high-temperature-resistant and low-tension foam flooding agent for improving a recovery ratio of crude oil in a reservoir and a preparation method thereof. The high-temperature-resistant and low-tension foam flooding agent is prepared by continuously stirring salts of alkyl phenol polyoxyethylene ether, sodium alkyl sulfonate, sodium chloride and water at 20-60 DEG C until the salts of alkyl phenol polyoxyethylene ether, sodium alkyl sulfonate and sodium chloride are completely dissolved. The high-temperature-resistant and low-tension foam flooding agent disclosed by the invention has the characteristics of ultralow interfacial tension, strong foaming capability, good foam-stabilizing effect and high temperature resistance and good compatibility with formation water and the like and does not be decomposed at high temperatures of 250 DEG C. The ultralow interfacial tension between aqueous solution (of which the salinity is 0-10000mg/L) of the high-temperature-resistant and low-tension foam flooding agent with a concentration of 0.1-0.5wt% and crude oil can be less than 10<-2>mN/m. The high-temperature-resistant and low-tension foam flooding agent, disclosed by the invention, can be used in a high-temperature reservoir to improve the recovery ratio of crude oil.

Description

technical field [0001] The invention relates to a foam oil displacement agent for enhancing oil recovery in oil reservoirs, in particular to a high-temperature-resistant low-tension foam oil displacement agent for enhancing oil recovery in oil reservoirs, and a preparation method for the foam oil displacement agent. Background technique [0002] At present, more than 30 of the largest oil fields in the world have entered the late stage of production, and are facing the development situation of high water content of production fluid, high degree of crude oil recovery, high rate of crude oil recovery, low storage-production ratio, and low water flooding recovery . How to improve the development effect of these old oilfields, and how to improve the oil recovery of oil reservoirs after polymer flooding have attracted more and more attention and attention. These oil fields are in urgent need of new tertiary oil recovery technology to enhance the recovery of crude oil, so as to i...

Claims

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Application Information

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IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 杨力生肖磊孙林涛吕晓华赵濉宫清涛靳志强
Owner GASOLINEEUM EXPLORATION DEELOPMENT INST OF HENAN OILFIELD BRANCH SINOPEC
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