Anti-scale agent suitable for high-salt and high-chlorine working conditions and preparation method thereof

Abstract

The invention discloses an anti-scale agent suitable for high-salt and high-chlorine working conditions, which comprises the following components in percentage by weight: 4.0 to 29.0 percent of maleic acid, 2.0 to 9.0 percent of amino trimethylene phosphoric acid, 0.5 to 4.0 percent of ethylenediamine tetramethylene phosphoric acid, 2.0 to 5.0 percent of hydroxy ethylidene sodium diphosphate, 3.0 to 15.0 percent of gluconate radical and the balance of water. The content of polyaspartic acid or polyepoxysuccinic acid is 4.0%-10.0%, and the balance is water. By compounding maleic acid with other substances and by virtue of the synergistic effect of the components, the scale inhibitor improves the scale inhibition effect, is especially suitable for scale inhibition under high-salt and high-chlorine working conditions, reduces the influence on the environment, and has better scale inhibition performance due to the good synergistic effect, thereby obtaining greater social and economic benefits.

Description

technical field [0001] The invention relates to the technical field of petrochemical scale prevention, in particular to a scale inhibitor suitable for high-salt and high-chlorine working conditions and a preparation method thereof. Background technique [0002] With the rapid development of society and economy, energy supply is becoming increasingly tight, and the world's attention and emphasis on energy has greatly increased. Scaling is an important technical problem in oil and gas extraction and gathering and transportation. The formation water contains high concentrations of salt ions that are easy to scale. During the oil extraction process, changes in pressure, temperature or water composition change the original chemical balance, resulting in scaling. The scale is hard and difficult to remove. The scaling of oilfield pipelines not only reduces production efficiency, but also causes a waste of funds during maintenance, and reduces the inner diameter of the pipeline and ...

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Problems solved by technology

[0003] The patent with the publication number "CN103803721A" provides a special antiscaling agent for salt production, which is composed of starch gluconate, sodium lignosulfonate, itaconic acid-malic acid-sodium pyrophosphate telomer and purified water according to a certain amount. The antiscaling agent prepared by the present invention is added to the brine of the salt making process, which can effectively prevent Ca in the brine of the salt making process. 2+ , Mg 2+ Insoluble salt crystallization occurs. The existing technology is mainly aimed at the water system for the scale inhibition treatment in the high-salt and high-chlorine environment, and the research on this environment is not deep enough. The effect is better in salty and high-chlorine environment, but it has no research on the high-salt and high-chlorine environment in the field of oil production, and lacks support for the anti-scaling and anti-scaling operations in the high-salt and high-chlorine working conditions in the field of oil production; the publication number is "CN101607766" patent discloses the preparation of a corrosion and scale inhibitor for high alkali and high chlorine circulating cooling water. The raw materials are polyepoxysuccinic acid, 2-phosphonic acid butane 1,2,4 tricarboxylic acid, Corrosion synergist, sodium gluconate, alkyl epoxy carboxylate, benzotriazole, etc., the existing technology provides a low-phosphorus Environmentally friendly corrosion and scale inhibitors, but the formula is complicated and expensive, and it is not easy to obtain. There is no further research on the performance of scale and scale inhibition in high-salt environments; the literature "Guangzhou Chemical Industry" provided the corrosion and scale inhibition The agent is suitable for heavy oil produced water with high chlorine and high salt, and the scale inhibition rate can reach more than 85%, but it has not conducted in-depth research on the scale and scale inhibition performance of oil-water mixed media

[0004] The above disclosed and currently commonly used antiscalants cannot adapt to the characteristics of the existing high-salt and high-chloride environment medium in the oil field. The high concentration of salt ions and chloride ions in the medium can affect the adsorption of conventional antiscalants and the complexation process with ions. The scale inhibition effect of the anti-scaling agent is not obvious

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