Anti-swelling shrinking agent and preparation method thereof

Abstract

The invention discloses an anti-swelling shrinking agent which comprises, by weight, 15.7-64.68 parts of tertiary amine, 6-13.3 parts of epoxy chloropropane, 5-13.5 parts of hydrochloric acid and 12-32 parts of organic solvents. The tertiary amine, the epoxy chloropropane and the hydrochloric acid react in the organic solvents to generate long-chain quaternary ammonium salt with good surface activity. By electrostatic interaction, the long-chain quaternary ammonium salt with positive charge is easily adsorbed on the surfaces of clay particles with negative charge, crystal layer repulsion of the clay particles is reduced, the clay particles can be separated from water molecules, and continued hydrous swelling of the clay particles is inhibited. Surplus positive charge continues to be adsorbed on the surfaces of the clay particles, double electric layers are compressed by electrostatic repulsion, the distance between clay layers is shortened, and the anti-swelling shrinking agent has shrinking effects. The anti-swelling shrinking agent has anti-swelling and shrinking functions and further has surface activity. The invention further provides a preparation method of the anti-swelling shrinking agent.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to an anti-swelling and shrinking agent and a preparation method thereof. Background technique [0002] In the process of oilfield development, water injection is an important measure to replenish formation energy and maintain high and stable oil production. However, in the process of water injection, water-sensitive damage caused by the expansion and migration of viscous minerals in the reservoir is an important factor affecting the effect of water injection. At present, the following two methods are usually used in the actual production of oilfields: (1) adding inorganic salt clay stabilizers such as potassium chloride and ammonium chloride at the initial stage of water injection to slow down the damage of viscous mineral expansion to the reservoir; (2) adding a certain Surfactants are used to reduce the capillary binding force of reservoir pores to water. However, t...

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Problems solved by technology

The anti-expansion and anti-shrinkage agents provided by the first four inventions all have good anti-expansion and anti-expansion effects, but they do not have surface activity and cannot reduce the capillary binding force of reservoir pores to water; although the anti-expansion and anti-expansion agents provided by CN105647509A The agent has a certain surface activity, but it is achieved by adding a certain amount of fluorosurfactant, which may cause the wetting reversal of the reservoir

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