Compound type hydrate inhibitor

Abstract

The invention belongs to the field of gas storage and transportation, and specifically relates to a compound type gas hydrate inhibitor. The inhibitor consists of the following components in percentage by mass: 0.1-0.5% of polyvinyl caprolactam, 1-5% of alcohol or salt and the balance of water. According to the inhibitor provided by the invention, by adding a certain amount of salt or alcohol into the existing dynamic inhibitor, the generation time of a hydrate can be increased, and the generation amount of the hydrate can be reduced; and moreover, the inhibition effect of the dynamic inhibitor is greatly improved so that the dynamic inhibitor has a better effect and is more stable and wider in range of application.

Description

technical field [0001] The invention belongs to the field of gas storage and transportation, in particular to an additive for inhibiting the occurrence of hydrates in the gas storage and transportation process. Background technique [0002] During the extraction and transportation of oil and natural gas, various low-boiling hydrocarbon gases (such as methane, ethane, propane) and non-hydrocarbon gases (carbon dioxide, hydrogen sulfide) are easily Forms gas hydrates with water in petroleum fluids. Gas hydrate is a cage structure formed by water molecules connected by hydrogen bonds, and small gas molecules are surrounded in the cage structure by van der Waals force to form an ice-like compound. It gathers together under certain conditions and forms lumps. In severe cases, it will block equipment such as pipelines, wellbores, valves, and instruments. This poses a great threat to the production, storage and transportation of oil and gas industries, mainly in the following thre...

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Problems solved by technology

[0003] (1) Hydrate generated in the pipeline will block the pipeline, increase the pressure difference of the pipeline, damage the pipe fittings, etc.;

[0004] (2) The formation of hydrates in the porous media of formations will block oil and gas wells, reduce the porosity and relative permeability of oil and gas reservoirs, change the distribution of oil and gas in oil and gas reservoirs, and reduce the production of oil and gas wells;

[0005] (3) The formation of hydrate in the wellbore will block the wellbore, damage the internal components of the wellbore, reduce oil and gas production or even stop production

However, the kinetic inhibitor is greatly affected by the degree of subcooling. At present, the highest supercooling degree applicable to the kinetic inhibitor is only 10-12°C. At a higher degree of supercooling, the inhibitory activity is low, so it must be combined with a thermodynamic inhibitor. It is economical and effective to use

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