A salt-resistant and temperature-resistant foaming agent

Abstract

The invention provides a salt-resistant and temperature-resistant foaming agent, which is composed of long-chain sodium α-olefin sulfonate, betaine-type surfactant and hydrophilic linking agent in a molar ratio of 1:1:(0.01-0.24). Proportions are mixed, wherein, the long-chain α-olefin sulfonate is sodium C14-16α-olefin sulfonate, C14-18α-olefin sodium sulfonate, C16-18α-olefin sodium sulfonate or C20-24α-olefin sulfonic acid Sodium; betaine type surfactant is cocamidopropyl betaine or cetyl betaine or their mixture; hydrophilic linking agent is cetyl glucoside or octadecyl glucoside or their mixture , This foaming agent is suitable for foam flooding foaming agent or foam plugging agent or foam drilling fluid foaming agent or drainage gas production under the condition of salinity below 25×104mg / L and temperature up to 120℃ foam remover.

Description

technical field

[0001] The invention relates to an oilfield chemical agent, in particular to a foaming agent suitable for salt resistance and temperature resistance. Background technique

[0002] Foam belongs to the multiphase dispersion system, which is a non-Newtonian fluid with low density, good viscosity and compressibility. Foam systems are widely used in oilfields, such as foam drilling, foam flooding, foam drainage and gas recovery, foam profile control and water plugging, foam fracturing, foam acid acidification, foam sand washing, foam well killing, foam cement cementing, etc. . Foam is composed of water, blowing agent and gas. Foaming agents used include sulfonate-type anionic surfactants, betaine-type amphoteric surfactants, non-ionic surfactants, and non-ionic-anionic surfactants. Sulfonate-type anionic surfactants include petroleum sulfonates, alkyl sulfonates, alkylbenzene sulfonates, heavy alkylbenzene sulfonates and olefin sulfonates. Betaine-type amphote...

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