Superstrong pincerlike scale dissolving liquid

Abstract

The invention relates to a superstrong pincerlike scale dissolving liquid which is prepared from the following components in percentage by weight: 18-22% of citric acid, 3-8% of sulfuric acid, 8-12% of potassium dichromate, 3-8% of ferrous sulfate, 8-12% of urotropin and the balance of solvent water. The superstrong pincerlike scale dissolving liquid provided by the invention can be used for effectively dissolving compound scales generated in a three compound combination flooding process to separate scale crystals, solving the problem of holddown of an injection-production system and scale formation of immediate vicinity of a wellbore, increasing the capacity of the oil well, prolonging the operating period and lowering the production cost per ton. Moreover, the superstrong pincerlike scale dissolving liquid has a good corrosion inhibiting effect to the injection-production system such as pipelines, sleeves and pumps.

Description

Technical field: [0001] The invention relates to a chemical additive used in the field of oil recovery technology, in particular to a super-strong pincer-shaped scale-dissolving solution. Background technique: [0002] With the progress of the ASP flooding development process, relatively serious fouling has appeared in the injection-production system and the formation near the wellbore, which has seriously affected the normal production. Moreover, the scale formed by ASP flooding is generally a composite scale in the form of porcelain flakes, that is, the outer layer of silicate scale and carbonate scale is also coated with a layer of organic matter. The chemical composition and formation process of the composite scale are essentially different from those of boiler scale and water pipeline scale. In the ASP flooding block of the oil field, if the formation contains barium and strontium minerals, under the action of strong alkali (pH value greater than 13) in the ternary flu...

AI Technical Summary

Problems solved by technology

The invention can effectively dissolve and separate the scale crystals for the complex scale produced in the process of ASP flooding, solve the problem of pump stuck in the injection-production system and scale near the wellbore, increase the product

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