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

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...

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.