An environmentally friendly and efficient natural gas hydrate inhibitor

Abstract

The invention discloses an environmental-friendly efficient natural gas hydrate inhibitor. The inhibitor is prepared from the following raw materials in parts by weight: 20-60 parts of polypropylene glycol, 6-37 parts of polyvinyl caprolactam, and 20-60 parts of polyvinylpyrrolidone. When the inhibitor is used, the dosage of the inhibitor is 0.5-3% of the volume of water in a system. The inhibitor disclosed by the invention better overcomes the defects of a traditional hydrate inhibition method, and overcomes abuses of large dosage, high expense and strong corrosion on pipelines of thermodynamics inhibitors at the same time. The main component, polypropylene glycol, of the hydrate inhibitor disclosed by the invention is not volatilized and corrosion-resistant, and polyvinylpyrrolidone is a substance with low toxin and better biocompatibility, so that the hydrate inhibitor is harmless to environment and organisms, the hydrate inhibitor does not pollute environment, and the environmental friendly requirement can be satisfied. The inhibitor disclosed by the invention does not have volatility, the chemical stability and the heat stability of the inhibitor are good within a temperature range of under 100 DEG C, and the inhibitor is incombustible and incorrosive and is convenient to implement.

Description

technical field [0001] The invention relates to the technical field of natural gas hydrate, in particular to an environmentally friendly and efficient natural gas hydrate inhibitor. Background technique [0002] Natural gas hydrate is a certain small molecular gas (N 2 , CO 2 、CH 4 、C 2 h 6 、C 3 h 8 etc.) and liquid water form ice-snow-like cage-shaped crystals. During oil and gas exploitation and loosening, due to the low temperature and high pressure in the pipeline, natural gas hydrates are easy to form. In severe cases, these hydrates can block wellbores, pipelines, and valves. and equipment, causing pipeline bursts and instrument damage, thus affecting the normal operation of natural gas extraction, gathering, transportation and processing, resulting in huge economic losses. In addition, for the development of offshore oil and gas fields and the loosening of deep-sea pipelines, the problem of hydrates is particularly prominent, because the water temperature and p...

AI Technical Summary

Problems solved by technology

However, the invention is greatly affected by supercooling, high cost, responsible synthesis process, and has certain pollution to the environment.