A kind of oil field neutral scale removing and dispersing agent

Abstract

The invention discloses a neutral descaling and dispersing agent for oil fields, which specifically comprises 20-30 parts of organic phosphonic acid, 5-10 parts of an aqueous solution of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, and 9 parts of metal hydroxide ‑15 parts, deionized water 45‑70 parts. The oilfield neutral descaling and dispersing agent provided by the invention can effectively reduce the corrosion rate of the system, prolong the service life of the equipment, and can satisfy the dissolution and dispersion of the sulfate scale and carbonate scale produced by the mixing of oilfield injection water and oil layer water and dredging of pipelines. At the same time, it has a certain effect on inhibiting the formation of calcium strontium barium sulfate, carbonate scale and iron oxide precipitation in the oilfield water injection system. The synthesis process is simple, and the synergistic performance between monomers is good, which can improve the utilization rate of oilfield reinjection water. Save water.

Description

technical field [0001] The invention relates to a descaling and dispersing agent for oilfield water injection systems, in particular to a neutral descaling and dispersing agent for removing barium strontium sulfate, calcium sulfate and calcium carbonate scales. Background technique [0002] In the process of oilfield exploitation, as the fluids in the oilfield such as oil and water are continuously extracted from the oil-water layer, the oil layer pressure of the oil well continues to drop, resulting in a sharp drop in oil production. Relying on elastic oil recovery cannot meet the production requirements. The exploited oil layer is injected with water to replenish the pressure of the oil layer deficit. Oilfield water injection development is a commonly used method of oil production. Although the water quality conditions of oilfield water injection raw water are different, a common distinctive feature of oilfield injection water is that it contains a large amount of calcium,...

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Problems solved by technology

The chemical descaling agent initially chooses dilute solutions of strong acids such as nitric acid and sulfuric acid. With the development of industry, strong acid descaling agents are gradually replaced by organic acid systems, which overcome the shortcomings of strong acids such as strong corrosion, strong irritation, and inconvenient production and use. It can effectively remove scale, and the reaction products are all soluble salts without secondary precipitation. However, while the organic acid system agent maintains its strong solubility, it still maintains its weak acidity. Long-term operation will cause the column, rubber cartridge Corrosion occurs, and it is usually necessary to add surfactants to the agent to reduce the adhesion between the particles attached to the surface of the salt scale. The addition of surfactants will generate a large amount of foam, which will bring difficulties to the post-treatment of oilfield sewage

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