Blocking remover and preparation method thereof

Abstract

The invention discloses a blocking remover and a preparation method thereof. The blocking remover comprises following raw materials: Brevibacillus borstelensis biosurfactant fermentation liquid and hydrophobic nano silicon dioxide, and an emulsifier, an anti-scaling agent, an anti-swelling agent and a cosolvent can also be contained. The preparation method of the blocking remover comprises the following steps: firstly, adding the biosurfactant fermentation liquid, the emulsifier and the cosolvent into a reaction container, heating, and uniformly stirring; secondly, adding the anti-scaling agent and the anti-swelling agent into the solution obtained in the former step, and stirring for dissolving; and finally, continuously heating a prepared solution, adding hydrophobic inorganic nanoparticles into the reaction container, and uniformly stirring. The blocking remover has low oil-water interfacial tension, can effectively strip and emulsify residual oil and colloidal asphaltene deposits in a medium-low permeable layer to form a low-viscosity emulsion, remove organic blocking, resist hypersalinity, can be completely degraded by microorganisms, and is green and environment-friendly.

Description

technical field [0001] This article relates to oil and gas recovery technology, specifically a plugging remover and its preparation method, especially a bionano-based plugging remover and its preparation method for newly put into production trans-injection wells. Background technique [0002] Water injection has become the main way for oilfields to replenish formation energy, and most water injection wells are transfer injection wells adjusted by oil wells, there will be a certain amount of residual oil and deposited colloidal The layer contains clay minerals, and there is a problem of clay hydration swelling. At present, when oilfields perform pretreatment in transfer wells, since the surfactants used to treat residual oil are generally anionic, the anti-swelling agents and surfactants used to treat water-sensitive clay minerals are cationic polymers or surfactants. Treatment agents cannot be mixed and need to be prepared and injected separately. This makes the current pr...

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Problems solved by technology

This makes the current pretreatment agent have the following limitations and deficiencies: 1) anionic surfactants are not resistant to high salinity, if the water-sensitive critical salinity of the reservoir is higher, or the calcium and magnesium ion content is higher, then This technique cannot be implemented; 2) the interfacial tension of most pretreatment agents is at 10 1 About mN / m, it has a certain effect on high permeability, medium to high permeability and other reservoirs, but the treatment effect is not ideal for medium to low and low permeability transfer injection wells, and sometimes even causes secondary damage (mixing of two pretreatment agents 3) Cationic polymers or cationic surfactants are adsorbed on the surface of formation rock minerals, and long-term injection will change the wettability of reservoir formations and affect the ultimate oil recovery; 4) The current predictive Most of the treatment agents are chemically synthesized surfactants or polyquaternium cationic polymers, which have a low degree of biodegradability and have great damage to the beneficial microorganisms in the natural environment and oil reservoirs; 5) Treatment of residual oil and water sensitivity Mineral surfactants or additives cannot be mixed, and need to be squeezed into the formation in sections, and the construction time is long when implemented on site; 6) Refractory additives enter the oil-water recovery fluid, which increases the difficulty of demulsification and dehydration of crude oil in the later stage and the burden of sewage treatment

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