Foam drainage agent resistant to gas condensate and mineralization degree and preparation method thereof

Abstract

On the basis of analysis of a composition and physicochemical conditions of an accumulated fluid of a natural gas well, based on a synergistic effect between an anionic surfactant and a nonionic surfactant, through compounding of the anionic surfactant and the nonionic surfactant, and with supplement of modification of a foam stabilizer and an amphoteric surfactant, a foam drainage agent which is strong in fluid-carrying capability and can meet drainage and gas exploitation of the natural gas well containing more gas condensate and having relatively high alkaline earth metal ion concentration in the well cylinder accumulated fluid is obtained. The foam drainage agent is applicable for drainage and gas exploitation of the natural gas well, and especially for drainage and gas exploitation of the natural gas well having high gas condensate content and high alkaline earth metal ion concentration.

Description

Technical field

[0001] The invention relates to a chemical additive for the drainage and gas recovery of natural gas wells in the field of oil and gas field development, in particular to a situation where the condensate oil content in the formation is high, the salinity is high, and the calcium and magnesium ion content is high, and there is a large amount of methanol. Foam drainage agent for drainage and gas recovery. Background technique

[0002] Foam drainage agent used in natural gas wells (hereinafter referred to as foam drainage agent) is a type of chemical additives that are mainly surfactants and supplemented by other chemical additives for the drainage and gas recovery of natural gas wells. The principle of foaming agent drainage and gas recovery is to use the foaming properties of surfactants, and with the agitation of gas well natural gas, the liquid accumulation of gas wells (including water, condensate oil, methanol and methanol added to inhibit the formation of natu...

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