Environment-friendly nanometer emulsion fracturing fluid and preparation method thereof

Abstract

The invention provides a preparation method for environment-friendly nanometer emulsion fracturing fluid. The method comprises the following steps of dissolving monomers A, monomers B, monomers C, inorganic salts and dispersing agents into deionized water to form a mixed solution; performing heating and nitrogen gas introduction; adding initiators to initiate the polymerization under the nitrogen gas protection; meanwhile, dispersing the mixed solution by using high-speed dispersion combining high-pressure homogenizing or high-pressure microjet to form dispersing liquid; diluting the dispersing liquid so as to obtain the environment-friendly nanometer emulsion fracturing fluid through preparation. The monomers A are water-soluble monomers with carbon-carbon double bonds; the monomers B are cationoid water-soluble monomers with carbon-carbon double bonds; the monomers C are polyether type monomers with carbon-carbon double bonds. The preparation method for the fracturing fluid is simple; the environment-friendly effect and no pollution are realized; the energy consumption is low; the application range is wide; meanwhile, the excellent functions of resistance reduction, clay stability, discharge assistance, sand suspending, surface activity reduction and the like are realized; high stability is realized; layering flocculation, accumulation and sedimentation cannot easily occur.

Description

technical field [0001] The invention belongs to the field of oil field exploitation, and in particular relates to an environment-friendly nanoemulsion fracturing fluid and a preparation method thereof. Background technique [0002] Tight unconventional reservoirs are characterized by low porosity and low permeability, making exploration and development difficult. Most tight oil and gas wells require reservoir reconstruction to obtain ideal production. At present, the most important production stimulation measure for the development of tight unconventional reservoirs at home and abroad is drag reduction fracturing. Traditional gel fracturing fluid systems use higher concentrations of gels, and the residues of these gels, along with the filter cake produced during the fracturing process, can plug the formation and reduce fracture conductivity. The slick water fracturing fluid system is a new fracturing fluid system developed on the basis of traditional fracturing fluids for t...

AI Technical Summary

Problems solved by technology

For example: the solid content of the aqueous solution is generally low, and the molecular weight is not easy to control, and the transportation cost is high; the powder needs to be dried by a large amount of heat and requires special drying equipment, and it needs high-speed stirring and heating during use, which is time-consuming and labor-intensive; water-in-oil Emulsion is to disperse water-soluble polyacrylamide in oil (hydrocarbons). When in use, these hydrocarbons will enter the water system, which not only wastes precious hydrocarbon resources, but also causes pollution to the water system and the environment

Images