Negative-nonionic sulfonate high-temperature foamer for oil extraction

Abstract

The invention discloses a negative-nonionic sulfonate high-temperature foamer for oil extraction. The invention adopts the technical scheme as follows: the foamer is characterized by belonging to negative-nonionic surfactants and mainly comprises the following components: a Spann sulfonate surfactant, a Tween sulfonate surfactant, a foam stabilizer and a pH regulator. The foamer has the benefits that negative-nonionic sulfonate is adopted as a main raw material; the foamer is applied to a site, is good in water solubility and dispersity when being used in an oil-water well, is good in foamability and excellent in foam stability at high temperature (89 DEG C), and belongs to new-generation high-temperature foamers; foam generated by the foamer is very high in surface strength and very stable; the foamer is good in compatibility with wastewater; the gas release speed is high and can be controlled; the effect of foaming for foam flooding is achieved.

Description

technical field [0001] The invention relates to the technical field of oilfield chemistry, in particular to a high-temperature foaming agent for oil recovery, in particular to an anion-nonionic sulfonate high-temperature foaming agent for oil recovery. Background technique [0002] In the process of thermal recovery of heavy oil, due to the difference in density between steam and oil-water when steam is injected, and the viscosity difference between steam and reservoir fluid, the channeling of injected steam is caused, resulting in poor steam huff and puff effect and reduced oil recovery. Foam profile control can effectively improve the development effect of heavy oil thermal recovery wells, increase steam swept volume and oil displacement efficiency. Surfactants are often used as foaming agents in foam profile control technology, and most widely used are anionic surfactants, such as sodium dodecylbenzenesulfonate, sodium lauryl polyethylene oxide ether sulfate, lignin Sulf...

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Problems solved by technology

[0004] The present invention provides an anion-nonionic sulfonate high-temperature foaming agent capable of improving crude oil recovery in order to solve the problem that the existing foaming agent cannot be applied to high-temperature and high-salt oil reservoirs, and the increase rate of crude oil recovery is not obvious

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