A kind of preparation method of completely degradable solid corrosion inhibitor

Abstract

A preparation method that can completely decompose the solid corrosion agent, mix the lactic acid with the catalyst evenly, heated the reaction to obtain a lactic acid hyperthyroidism;Species or multiple, then react 1 to 4h at 155-165 ° C, and then react 1‑4h at 175-185 ° C to get a lactic acid co -polymer; then add a corrosion agent, under 135‑145 ° C, stir 1‑4h under 1‑4hAdd the additive, stir at 0.5‑3h at 135‑145 ° C; add zinc powder or aluminum powder, stir at 0.5‑3h at 135‑145 ° C, add peroxide, and make granules after reaction.The price of solid slow release agents of the invention is low, the structure is stable, and the release rate of the corrosion agent is controlled.The structure of the lactic acid clustering on the corrosion agent is stable, and then through cross -linking, the service life of this corrosion in the underground can reach more than 3 months.

Description

technical field [0001] The invention belongs to the field of material preparation, and relates to a preparation method of a completely degradable solid corrosion inhibitor. Background technique [0002] Most of my country's onshore oil fields have entered the middle and late stages of development, and the water content in the produced fluid is quite high. Due to geological reasons, these produced waters have dissolved CO to varying degrees 2 , H 2 S.O 2 , bacteria and dissolved salts and other substances that have a corrosive effect on metals, causing serious corrosion to related equipment and pipelines. The results of corrosion have caused significant economic losses to oil and gas fields. According to literature reports, the losses caused by corrosion in the petroleum and petrochemical industries account for about 6% of the production value on average. Corrosion losses can be reduced by 30%-50% if proper protective measures are taken. [0003] Corrosion inhibitor is a...

AI Technical Summary

Problems solved by technology

Regular injection through the wellhead, on the one hand, shutting down the well will affect production; on the other hand, the distance between the wellhead and the bottom of the well is too long, resulting in more waste of corrosion inhibitors and lower use efficiency

When winter comes, areas with lower temperatures make it more inconvenient to add liquid corrosion inhibitors

There is also a patent (CN200510090151.1) using a solid block corrosion inhibitor, but this anti-corrosion block has a large shape, and the addition process is complicated and requires well shutdown operations. The anti-corrosion effect of this method is not ideal

In recent years, some manufacturers have also prepared solid corrosion inhibitors for oilfield wellbore corrosion inhibition (CN201310114281.9, CN201510867232.1). This kind of corrosion inhibitors is made by combining existing corrosion inhibitors and polymer oligomers during the molding process. Simple mixing of substances, firstly, there are defects such as uneven structure, easy pulverization, and unstable release process

There are also reports on the preparation of capsule solid corrosion inhibitors (CN03813457.8, CN201110139154.5). At present, this type of corrosion inhibitor has the disadvantages of high production cost and a large amount of insoluble matter. Long-term use is easy to accumulate in the wellbore, causing oil well blockage

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