Surfactant with low surface and interface tension and high contact angle and preparation method thereof

Abstract

The invention discloses a surfactant with low surface and interface tension and a high contact angle and a preparation method thereof, and belongs to the technical field of surfactants. The surfactantwith the low surface and interface tension and the high contact angle is prepared from the following components in parts by weight: 15-25 parts of a fluorocarbon surfactant, 40-60 parts of alkylphenol polyoxyethylene, 40-60 parts of polyquaternary ammonium salt high polymer and 40-60 parts of a cosurfactant. By means of the water unblocking agent (surfactant with the low surface and interface tension and the high contact angle) provided by the invention, surface tension and interface tension of a solution can be effectively reduced, a contact angle is increased, moreover, the temperature resistance performance is good, the stability is good, and water blocking damage of a low-porosity low-permeability reservoir can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of surfactants, in particular to a surfactant for oilfield chemical additives with low surface interfacial tension and high contact angle and a preparation method thereof. Background technique [0002] During drilling, completion, workover and production operations, foreign phases often remain in porous media. Another immiscible phase infiltrates into the reservoir, or the saturation of the original immiscible phase in the porous medium increases, which will damage the relative permeability, so that both the reservoir permeability and the relative permeability of oil and gas are significantly reduced. When the immiscible phase is aqueous, this phenomenon is called water lock-in. The water-locking effect will produce water-locking damage, that is, the damage caused by water immersion into the oil layer during oil well operation. Water immersion will increase the water saturation near the wellbore, increase ...

AI Technical Summary

Problems solved by technology

The poor permeability of low-permeability reservoirs makes it difficult or even impossible to flow back the well fluid that invades the reservoir, resulting in water lock damage

Researches at home and abroad have shown that water lock damage is the most important and serious damage type in low-permeability reservoirs, and the damage rate is generally 70-90%. increase mining efficiency and increase development costs

On the one hand, there are complex conditions such as high temperature and high salinity in the underground, and the existing water-dissolving and locking agents are difficult to adapt to the high-temperature and high-salt environment in the underground

Technical realization elements: In view of the existing low-permeability reservoirs that are difficult to restore reservoir permeability due to water lock damage, single well productivity decline, low reservoir recovery efficiency, and high development costs, it is urgent to provide a method that can effectively relieve low-permeability reservoirs. Water-locking agent for water-locking effect in permeable reservoirs

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