A kind of preparation method of completely degradable solid corrosion inhibitor

A completely degradable corrosion inhibitor technology, which is applied in chemical instruments and methods, earthwork drilling, drilling compositions, etc., can solve the problems of excessive corrosion inhibitor waste, oil well blockage, and large anti-corrosion blocks, etc., to achieve Anti-corrosion and dissolution, long service life, and stable structure

Active Publication Date: 2022-08-09
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • A kind of preparation method of completely degradable solid corrosion inhibitor
  • A kind of preparation method of completely degradable solid corrosion inhibitor
  • A kind of preparation method of completely degradable solid corrosion inhibitor

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preparation example Construction

[0031] The preparation method of the corrosion inhibitor of the present invention is as follows: firstly, polylactic acid and other components (toughening, increasing oil absorption) are copolymerized in a reaction kettle to obtain a lactic acid copolymer with good toughness, oil absorption and stability, which is used as a retarder. Slow-release matrix material for etchant;

[0032] Slowly add the corrosion inhibitor and auxiliary agent to the lactic acid copolymer and stir evenly;

[0033] Then add a certain amount of zinc powder or aluminum powder, stir evenly, to improve the slow release performance of the corrosion inhibitor and adjust the density of the corrosion inhibitor;

[0034] Further adding an appropriate amount of peroxide, stirring quickly and evenly, slightly cross-linking the lactic acid copolymer, so that the corrosion inhibitor phase encapsulated in the polymer is more stable, and the corrosion inhibitor has a longer service life.

[0035] Finally, it is gr...

Embodiment 1

[0051] 1) The lactic acid and the catalyst stannous chloride were mixed uniformly in a mass ratio of 100:0.3 and then put into a kettle type reactor, decompressed at 60°C (90Pa) for 2h, then heated to 80°C at 90Pa for 2h reaction, and then heated up The reaction was carried out at 100 °C for 2 h, and then heated to 120 °C for 2 h to obtain a lactic acid oligomer.

[0052] 2) under 90Pa, be warming up to 140 ℃, continue to add ethylenedicaprolactone in the lactic acid oligomer in the polylactic acid reactor, the mass ratio of the quality of the feed and the lactic acid oligomer is 3:100, then heat up The reaction was carried out at 160 °C for 2 hours, and then heated to 180 °C for 2 hours to obtain a lactic acid copolymer.

[0053] 3) Keep the pressure of the reaction kettle at 90Pa, reduce the temperature of the reaction kettle to 140°C, slowly add the corrosion inhibitor imidazoline to the polymer of lactic acid, the mass of the corrosion inhibitor added is 40% of the mass of...

Embodiment 2

[0062] 1) The lactic acid and the catalyst stannous chloride were mixed uniformly in a mass ratio of 100:0.4 and then put into a kettle type reactor, decompressed at 65°C (85Pa) for 1 hour, then heated to 80°C at 85Pa for 3 hours, and then heated again. The reaction was carried out at 100 °C for 3 hours, and finally heated to 120 °C for 3 hours to obtain lactic acid oligomers.

[0063] 2) Under 85Pa, heat up to 140°C, continue to add caprolactone to the lactic acid oligomer in the polylactic acid reactor, and the mass ratio of the mass of the feed to the lactic acid is 7:100, then heat up to 160°C and react for 3h , and then the temperature was raised to 180 °C for 3 h to obtain a lactic acid copolymer.

[0064] 3) keep reactor pressure 85Pa, the temperature of reactor is reduced to 140 ℃, in the polymer of lactic acid, slowly add ethylenediaminetetramethylenephosphonic acid, and the quality that diaminetetramethylenephosphonic acid adds is lactic acid quality 70%, and stirre...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/54C09K8/74C08G63/08C08G69/44C08G63/60
CPCC09K8/54C09K8/74C08G63/08C08G69/44C08G63/60
Inventor 王景平徐友龙
Owner XI AN JIAOTONG UNIV
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