Foaming drainage aid and preparation method thereof

Abstract

The invention relates to a foaming drainage aid and a preparation method thereof, and belongs to the technical field of oil and gas exploitation. The foaming drainage aid comprises the following components in percentage by mass: 5-15% of a cationic surfactant, 0-15% of a nonionic surfactant, 5-20% of an amine oxide amphoteric surfactant, 0.1-3% of a fluorocarbon surfactant, 0-20% of an auxiliary agent, 5-12% of a foam stabilizer and the balance of water. The foaming drainage aid has excellent foaming performance, good salt resistance and condensate resistance, and good stability in 25% hydrochloric acid; the synergistic effect between the surfactants is fully utilized, the drainage aid and the foaming agent are combined together, one single agent simultaneously has functions of foaming and assisting in drainage, the types of auxiliary agents are reduced, the risk of incompatibility among the single agents is reduced, and the foaming drainage aid has important significance for reducingthe cost and enhancing the effect.

Description

technical field [0001] The invention relates to a foaming and drainage aid and a preparation method thereof, belonging to the technical field of oil and gas exploitation. Background technique [0002] During the exploitation of tight carbonate rock, because the reservoir has the characteristics of tight core, low porosity, low permeability, and low formation pressure, ordinary acid fracturing, pre-fluid acid fracturing, multi-stage injection acid fracturing, and The combined sand and acid fracturing process reforms the reservoir to realize deep acid fracturing in the carbonate reservoir, form a stable oil and gas flow channel, and finally achieve the purpose of increasing production. [0003] However, in the process of acid fracturing, fracturing fluid and acid fluid are used to enter the reservoir, especially after entering the tight ultra-low permeability reservoir, due to the lack of energy in the formation, there is a serious capillary self-absorption, and the fracture o...

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Problems solved by technology

The Chinese invention patent with the authorized announcement number of 101538462B discloses an oil well drainage aid, which is used to aid the drainage of residual fluid after acid fracturing of oil wells in oil fields. The weight percentage of each component is: dodecyl dimethyl benzyl chloride Ammonium industrial products: 7.5~13.5%; fatty alcohol polyoxyethylene ether, JFC-4 industrial product: 2~3.5%; polyoxyethylene alkyl alcohol ether-8JFC industrial product: 25~34%; fatty alcohol polyoxyethylene ether , JCF-6 industrial products: 3.5-5%; fluorocarbon surfactant FN-3 industrial products: 0.05-0.1%, the rest is water; when acidizing and fracturing oil wells, add 1 ~1.5%, at room temperature, evenly stirred, can reduce the adhesion of the construction residual liquid flowing in the reservoir, and accelerate the flowback of the residual liquid by 20-30 percentage points, but the drainage aid can only be used as a drainage aid alone The fatty alcohol polyoxyethylene ether and other surfactants in the drainage aid have a good foaming effect, but lack of a foam stabilizer, so they can only be used to aid drainage in oil well fracturing construction, and cannot be used very well. Foaming forms stable foam to reduce fluid loss

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