Water-based emulsion composite blocking remover

Abstract

The invention relates to a water-based emulsion composite blocking remover, and belongs to the technical filed of petroleum water injection wells and oil well plug removal, yield increase and injection increase liquids. The water-based emulsion composite blocking remover is prepared by mixing an inorganic blocking remover with an organic blocking remover according to a mass part ratio of 4-6:1; a complex long-chain fatty acid monoalkyl ester and polyol organic polyether ester mixture is adopted as the organic blocking remover to effectively prevent crude oil emulsification and organic scale formation in oil reservoirs, resolves emulsification and organic scale plugging, and is in favor or recovering the crude oil and increasing the injection of water injection wells. A stratum mineral total rock analysis result shows that the water-based emulsion composite blocking remover adopting a concentration of an organic acid can remove plugging near inorganic scales, has very good reservoir reconstruction characteristic and very good compatibleness with a reservoir fluid, has a good comprehensive plug removal effect on organic matter plugging, and is simple to produce. The problems of severe influences of only treatment of inorganic scales, strong corrosion ability of the inorganic scales, poor plug removal effect of the organic scale plugging and weak corrosion ability of organic scales on the injection ability of the water injection wells and the production power of oil wells are solved.

Description

technical field [0001] The invention relates to a water-based emulsion composite plugging-removing agent, which belongs to the technical field of plugging-removing and production-increasing fluid injection for oil water injection wells and oil wells. Background technique [0002] In the process of oil field development, oil layer pollution is an important factor restricting the production of oil wells and affecting the amount of water injected into water injection wells. Reservoir pollution can directly affect the normal production of the oil field, reduce the productivity of the oil well, and even affect the ultimate recovery of the oil field; affect the reduction of the injection capacity of the water injection well. The formation of oil layer pollution and clogging is diverse, the periods that are likely to cause oil layer pollution are different, and the mechanism of oil layer pollution and clogging is also very different, and the degree of pollution clogging is also ver...

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Problems solved by technology

[0003] The object of the present invention is to, aiming at the deficiencies of the above-mentioned prior art, provide a comprehensive plugging removal performance and reservoir stimulation characteristics, good compatibility with reservoir fluid, low corrosion, good plugging removal effect on organic plugging, Strong corrosion ability and simple production process; it can solve the problem that the existing water-based emulsion plugging remover can only deal with inorganic scale, has a strong corrosion ability to inorganic scale, but has a poor unblocking effect on organic plugging, and has weak ability to dissolve organic scale, which seriously affects water injection wells Water-based emulsion composite plugging remover for injection capacity and oil well productivity problems

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