Scale and corrosion inhibitor for oilfield reinjection water and preparation method thereof

Abstract

The invention relates to a scale and corrosion inhibitor for oilfield reinjection water and a preparation method thereof, and belongs to the technical field of petroleum additives. The scale and corrosion inhibitor is prepared from the following components in parts by weight: 4-15 parts of laurylamine polyoxyethylene ether, 1-2 parts of polyepoxysuccinic acid, 6-11 parts of 2-acrylamide-2-methylpropyl sulfonic acid, 10-18 parts of molybdate, 4-9 parts of imidazoline, 1-6 parts of polyacrylamide, 4-8 parts of sodium sulfate, 3-6 parts of sodium citrate, 2-6 parts of sodium gluconate, 10-20 parts of ethyl acetate, 10-16 parts of ethanol and 26-30 parts of water. The scale and corrosion inhibitor can be effectively chelated with salt in produced water, has a scale inhibition rate of 99.9 percent, has an excellent antiseptic corrosion inhibition effect, cannot cause secondary injury on pipelines after being used, and has a corrosion inhibition rate of 96 percent.

Description

technical field [0001] The invention belongs to the technical field of petroleum additives, and in particular relates to an anticorrosion and scale inhibitor for oilfield reinjection water and a preparation method thereof. Background technique [0002] With the continuous exploitation of my country's oilfields, in order to prevent the quality of oil and gas from deteriorating, most oilfields will choose to use water injection for exploitation, and in order to prevent oil pipelines and water pipelines from fouling, various Chemical additives are used to prevent the formation and accumulation of dirt, so as to make oilfield production more convenient. However, with the increasing variety of additives used, the composition of reinjection water is extremely complex, and it is difficult to meet the standard requirements. [0003] After the oil field is put into development, the energy of the oil layer itself will be continuously consumed, resulting in a continuous drop in the pres...

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Problems solved by technology

[0002] With the continuous exploitation of my country's oilfields, in order to prevent the quality of oil and gas from deteriorating, most oilfields will choose to use water injection for exploitation, and in order to prevent oil pipelines and water pipelines from fouling, various Chemical additives are used to prevent the formation and accumulation of fouling, thereby making oilfield production more convenient. However, with the increasing variety of additives used, the composition of reinjection water is extremely complex, and it is difficult to meet the standard requirements

[0003] After the oil field is put into development, the energy of the oil layer itself will be continuously consumed, resulting in a continuous drop in the pressure of the oil layer, a large amount of degassing of the low crude oil, an increase in the viscosity, and a great reduction in the production of the oil well. Inject water into the oil field. In addition, the produced water in the oil field will be reinjected and utilized. However, due to its complex composition, it is easy to cause scaling in the pipeline, making the production work even more difficult.

At this time, the use of antiscalants becomes very important, and the existing antiscalants have poor enough effect due to their own formula defects, and do not have anti-corrosion effect, which is easy to cause secondary damage to pipelines