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Corrosion inhibitor for ground gathering and transportation system oil-water interfaces, and preparation method thereof

A technology for gathering and transportation system and oil-water interface, which is applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc. It can solve the problem that the oil-water interface does not have protection, cannot effectively solve pipeline corrosion, and the synthesis conditions are harsh and other problems, to achieve the effect of uniform and dense corrosion inhibitor film, solving corrosion problems, and strong adsorption capacity

Active Publication Date: 2018-07-03
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the synthesis conditions of this corrosion inhibitor are relatively harsh. If there is too much unreacted thiourea in the synthetic raw materials, the corrosion efficiency will be accelerated instead, and the problem of pipeline corrosion cannot be effectively solved; a patent application CN201110425823.5 also discloses a H 2 The corrosion inhibitor of S on the corrosion of ground gathering and transportation pipelines is specifically based on N-benzyl-N'-phenylpiperazine as the main agent and organic amine as the auxiliary agent. 2 S corrosion has a high anti-corrosion effect
[0004] Although the above corrosion inhibitors are effective for H 2 S / CO 2 Corrosion has a good corrosion inhibition effect, but it is mainly aimed at the corrosion of the area where the inner wall of the oil pipeline is in contact with the water phase, and it does not have a good protective effect on the oil-water interface. Corrosion inhibitors for oil-water interface related reports

Method used

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  • Corrosion inhibitor for ground gathering and transportation system oil-water interfaces, and preparation method thereof
  • Corrosion inhibitor for ground gathering and transportation system oil-water interfaces, and preparation method thereof
  • Corrosion inhibitor for ground gathering and transportation system oil-water interfaces, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1. Synthesis of the main agent

[0047] Add tung oil and water with a molar ratio of 10:1 into a stainless steel reactor, raise the temperature to about 100°C and keep it warm for 1 hour to obtain tungoleic acid; then add diethylenetriamine (the molar ratio of diethylenetriamine to tung oil is 1.6:3) , Stir and mix evenly, heat up to 130-150°C, keep warm for about 3 hours; heat again to 170-180°C for about 2.5 hours, and finally heat to 200-215°C for 5 hours to obtain tung oil imidazoline.

[0048] Then lower the temperature of the above reaction system to below 50°C, add propynyl alcohol and paraformaldehyde in sequence, wherein the molar ratio of propynyl alcohol, paraformaldehyde, and tung oil is 2:2:1; then heat up to 85-95°C , The end of the reaction after 7h, that is, the main agent.

[0049] image 3 It is the infrared spectrogram of the main agent synthesized in this embodiment, it can be observed that at 3286cm -1 N-H bond stretching vibration peak appeared ...

Embodiment 2

[0064] Take the main agent synthesized in Example 1, mix it with cetylpyridinium chloride, methylimidazole, polyoxyethylene (20) sorbitan monolaurate, isopropanol, and ethanol and stir evenly. See Table 5 for the ratio of the components, that is, the prepared corrosion inhibitor is coded as TLM16-D2.

[0065] Table 5 Component ratio of corrosion inhibitor TLM16-D2

[0066] component name

[0067] In order to test the protective effect of the corrosion inhibitor TLM16-D2 on the oil-water interface of the petroleum transportation pipeline, the simulated working environment completely consistent with that of Example 1 was used to conduct high temperature and high pressure tests. Under the condition of the test period of 7 days, when the corrosion inhibitor TLM16 When the amount of -D2 is 100mg / L, the measured corrosion rate is 0.0359mm / a, and the corrosion inhibition rate reaches 87.85%. It can also be observed by visual inspection that when the addition amount is 100 ...

Embodiment 3

[0069] The main agent is synthesized under exactly the same conditions as in Example 1; then it is mixed with cetylpyridine bromide, benzimidazole, alkylphenol polyoxyethylene ether, isopropanol and stirred evenly, and the content of each component Refer to Table 6 for the ratio, that is, the prepared corrosion inhibitor is coded as TLM16-D3.

[0070] Table 6 The composition ratio of corrosion inhibitor TLM16-D3

[0071] component name

[0072] In order to test the protective effect of the corrosion inhibitor TLM16-D3 on the oil-water interface of the petroleum transmission pipeline, the simulated working environment completely consistent with that of Example 1 was used to conduct high temperature and high pressure tests. Under the condition of the test period of 7 days, different corrosion inhibitors were tested. The corrosion rate and corrosion inhibition rate under the addition of TLM16-D3, the test results are shown in Table 7.

[0073] Table 7 Corrosion rate an...

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Abstract

The invention provides a corrosion inhibitor for ground gathering and transportation system oil-water interfaces, and a preparation method thereof, wherein the corrosion inhibitor comprises a main agent and an auxiliary agent, and the structure formula of the main agent is defined in the specification. According to the present invention, the corrosion inhibitor can effectively solve the corrosionon the water phase region in the petroleum conveying pipeline due to H2S / CO2 corrosion, can solve the corrosion on the oil-water interface, and can be used for the ground gathering and transportationsystem. The invention further provides the preparation method of the corrosion inhibitor for the ground gathering and transportation system oil-water interfaces, wherein the preparation method is simple and reasonable, and is suitable for large-scale popularization and practical application.

Description

technical field [0001] The invention belongs to the protection of metal materials in the petrochemical field, and in particular relates to a corrosion inhibitor and a preparation method thereof, in particular to a corrosion inhibitor for the oil-water interface of a ground gathering and transportation system and a preparation method thereof. Background technique [0002] With the substantial increase of sulfur content in crude oil transportation in my country, failure problems such as potholes, grooves, delamination and even perforation on the surface of oil pipelines caused by hydrogen sulfide and carbon dioxide corrosion cannot be ignored, especially in the middle and late stages of oilfield exploitation. , with the increasing water content, due to H 2 S / CO 2 The corrosion of oil pipelines continues to intensify. [0003] Adding corrosion inhibitors to the surface gathering and transportation system is one of the main ways to effectively solve the corrosion of oil pipelin...

Claims

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Application Information

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IPC IPC(8): C23F11/14C09K8/54
CPCC09K8/54C23F11/149
Inventor 李循迹常泽亮周理志张娟涛宋文文王福善毛学强袁静尹成先孟波李先明王远熊新民毛仲强李彬
Owner PETROCHINA CO LTD