Foaming agent for improving conventional oil reservoir raw oil recovery rate and its preparing method

A technology of foam agent and recovery factor, applied in the direction of drilling equipment, etc., can solve problems such as poor compatibility, easy to burst, and unstable foam, and achieve good foam stability, high calcium and magnesium ion resistance, and strong foaming ability Effect

Inactive Publication Date: 2005-08-03
中国石化胜利油田有限公司地质科学研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Foam flooding is a simple foam system oil displacement method formed by mixing foam agent and gas. At present, the foam agents on the market are mainly sodium lauryl sulfate, sodium α-olefin sulfonate, sodium alkylbenzene sulfonate, alkyl Sodium succinate and other products have strong foaming ability, but their compatibility with formation water is poor, and they are easy to form precipitation with calcium and magnesium ions in formation water, and the foam is a very unstable substance, which is very easy to burst. When using foam flooding, it is necessary for the foam agent to remain in the formation for as long as possible. Therefore, the foam needs to be as stable as possible. The foam agents currently on the market cannot meet the needs of foam flooding.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Add 500kg of foaming agent lauryl alcohol polyoxyethylene ether sulfate sodium salt (AES) into the reaction kettle, start the agitator, add 10kg of coconut oleic acid monoethanolamine, 150kg of betaine, 10kg of amine peroxide and 25kg of condensate Add 300kg of water to methyl cellulose, then heat to 40°C, continue to stir until it is completely dissolved and the reaction is complete, and finally add 300kg of water and 30kg of pure sodium chloride powder evenly, stir and mix to form the product.

Embodiment 2

[0015] Add 150kg foaming agent lauryl alcohol polyoxyethylene ether sulfate sodium salt (AES) into the reaction kettle, start the stirrer, add 100kg coconut oleic acid monoethanolamine, 80kg betaine, 150kg amine peroxide and 2kg condensate Add 10kg of pure water to methyl cellulose, then heat to 45°C, continue to stir until it is completely dissolved and the reaction is complete, and finally add 200kg of pure water and 2kg of pure sodium chloride powder evenly, stir and mix to form the product.

Embodiment 3

[0017] The main agent lauryl polyoxyethylene ether sulfate sodium salt (AES) of 300kg foaming agent is joined in the reactor, starts agitator, adds 50kg coconut oleic acid monoethanolamine, 20kg betaine and 70kg amine peroxide, then adds 300kg of water, then heated to 35°C, continue to stir until completely dissolved and the reaction is complete, and finally add 100kg of water and evenly add 10kg of pure sodium chloride powder, stir and mix to form the product.

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PUM

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Abstract

The foaming agent has materials including main foaming agent, foam stabilizer and foam stabilizing assistant as well as water. The main foaming agent is polydodecanol oxyethylene ether sodium sulfate; the foam stabilizer is coccinin monoethanolamine, betaine, peroxamine and methyl cellulose condensate; and the foam stabilizing assistant is sodium chloride. The preparation process of the foaming agent includes setting the main foaming agent into reactor, adding foam stabilizer and water while stirring to dissolve and react, adding rest of water and foam stabilizing assistant via stirring to obtain the product.

Description

Technical field: [0001] The invention relates to the technical field of enhanced oil recovery in conventional oil reservoirs, in particular to a foam agent for enhancing oil recovery in conventional oil reservoirs; the invention also relates to a method for preparing the foam agent. Background technique: [0002] When oilfield production is in the late stage of development, that is, when it enters the stage of high water cut and ultra-high water cut, how to improve the development effect of old oilfields, and how to increase the recovery rate after polymer flooding, over the years, relevant technical experts have done a lot of discussion, and have also achieved A lot of results have been achieved. What these old oilfields need most urgently now is to use new three-recovery technology to improve the recovery rate of old oilfields and increase recoverable reserves. Foam flooding is a simple foam system oil displacement method formed by mixing foam agent and gas. At present, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
Inventor 王其伟周国华李向良郭平李雪松
Owner 中国石化胜利油田有限公司地质科学研究院
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