Compound double-effect hydrate inhibitor containing low-dose PKO as well as preparation method and application of compound double-effect hydrate inhibitor

Abstract

The invention relates to the technical field of natural gas hydrates, in particular to a compound type double-effect hydrate inhibitor containing low-dose PKO as well as a preparation method and application of the compound type double-effect hydrate inhibitor. The compound double-effect hydrate inhibitor containing the low-dose PKO is prepared from the following raw materials: ethylene glycol (MEG), a PKO auxiliary agent and a CDEA solvent, and the mass ratio of the ethylene glycol to the PKO auxiliary agent to the CDEA solvent is (10-30): (0.05-0.1): (2.5-5). After common MEG involved in the invention is compounded with low-dose PKO, the inhibition performance of MEG can be remarkably improved, the thermodynamic inhibition effect of traditional MEG is exerted, and the polymerization inhibition effect of PKO is also exerted; meanwhile, after compounding, the injection concentration of MEG is greatly reduced (the maximum can be reduced by 50-60%), and the cost of the inhibitor is reduced.

Description

technical field [0001] The invention relates to the technical field of natural gas hydrate, in particular to a low-dose PKO-containing compound double-effect hydrate inhibitor and a preparation method and application thereof. Background technique [0002] In the process of natural gas hydrate extraction in the sea area, there is a low temperature and high pressure environment near the seabed mudline, and the subcooling degree can reach up to 10-15 °C. Under this condition, the hydrate decomposed gas and water can easily regenerate hydrate in the extraction pipeline. Once the secondary hydrate is formed, the output will be reduced in light, and serious production accident will be caused in heavy. At present, thermodynamic inhibitors are usually used in hydrate test mining to prevent the risk of secondary hydrates. However, this method requires a large amount of inhibitors (generally more than 50 wt%), high cost, and some chemicals will cause harm to the environment. [0003]...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a compound type double-effect hydrate inhibitor containing low dose of PKO and its preparation method and application, so as to overcome the existing hydrate inhibitors that cannot meet the conditions of natural gas hydrate exploitation in sea areas (high supercooling) high temperature, high water content) flow guarantee problem

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