A kind of hydrate kinetic inhibitor and its application

Abstract

The invention provides a novel hydrate dynamics inhibitor. The novel hydrate dynamics inhibitor comprises a hydrate-proof nucleating agent, a hydrate-proof growth agent and an additive. The novel hydrate dynamics inhibitor has the characteristics that the defects of large usage amount, high economic cost, pollution to environments and the like of the traditional thermodynamics inhibitor are well overcome; compared with the conventional hydrate-proof inhibitor and the hydrate polymerization inhibitor, the nucleating and growth rates of the hydrate can be effectively inhibited, and the formation time of the hydrate is prolonged; the large supercooling degree can be borne, the economic effect is realized, the efficiency is high, and the like; the problem of blockage of hydrate in the oil-gas-water three-phase and gas-water two-phase mixed conveying pipelines is effectively solved.

Description

technical field [0001] The invention relates to the technical field of oil and gas pipeline transportation, in particular to a novel hydrate kinetic inhibitor and its application. Background technique [0002] Gas hydrate is a solid compound with a cage structure similar to ice crystals formed by water and small molecular gas substances (such as carbon dioxide, methane, ethane, propane, etc.) under high pressure and low temperature conditions. Water molecules are called host molecules, while small gas molecules are called guest molecules. The host molecules are combined with each other under the action of hydrogen bonds to form cage-shaped holes of different sizes. The guest molecules interact with the host molecules through van der Waals force. And be enveloped in the cage-shaped hole. In the process of natural gas exploitation, processing and gathering and transportation, due to its special high pressure and low temperature environment, it is easy to form solid hydrates, ...

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Problems solved by technology

However, in the experimental research, it was found that the hydrate kinetic inhibitor is greatly affected by the system subcooling degree, and the inhibitory activity is low under the condition of high supercooling degree, so the application is limited; while the hydrate inhibitor can only be used in the oil phase and water phase. It can only play a role when it exists at the same time. The polymerization inhibition performance is greatly affected by the water content of the system, and the effect is not good when the water content is greater than 40%.

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