Sulfur solvent for cleaning sulphur deposition in wellhole

Abstract

The invention relates to a sulfur solvent for cleaning sulphur deposition in the wellhole, which consists of the following components: 90 to 95 weight percent of host crystal, 0.5 to 3.5 weight percent of catalyst and 1.5 to 7.5 weight percent of corrosion inhibitor, wherein the host crystal is dialkyl disulfide or diphenyl disulfide; the catalyst is organic amine, lewis base or a mixture of the organic amine and lewis base; and the corrosion inhibitor is beta-diethylin phenyl ketone or beta-abietylamine phenyl ketone or a mixture of the beta-diethylin phenyl ketone or the beta-abietylamine phenyl ketone. The sulfur dissolving rate and the sulfur-bearing quantity of the invention are superior to the common physical solvent, such as aliphatic hydrocarbon, benzene, CS2 and the conventional chemical solvent. The sulfur solvent can be used for cleaning and relieving sulphur deposition blockage of the wellhole of the high-sulfur gas well.

Description

technical field [0001] The invention relates to a sulfur solvent for cleaning the sulfur deposition in the shaft of a high-sulfur gas well. Background technique [0002] The physical properties of high-sulfur natural gas are quite different from those of conventional natural gas. In the process of natural gas exploitation, as the gas is produced, the formation pressure continues to drop, and elemental sulfur will be precipitated from the sulfur-carrying gas in the form of monomers. It exists in the form of solid sulfur under temperature conditions, and deposits in different parts of the wellbore, affecting the flow of natural gas. This not only causes serious harm to the normal operation of the gas well, but also brings many difficulties to the maintenance of production equipment. Once sulfur deposition occurs, the degree of sulfur plugging will become more and more serious as the production progresses, eventually leading to the shutdown of the gas well. For example, the Zh...

AI Technical Summary

Problems solved by technology

However, the main disadvantages of physical solvents are: (1) low solubility, limited sulfur loading capacity, and a large amount of solvent needed to clean and process the same weight of sulfur; (2) low sulfur dissolution rate, long on-site operation time, and increased operating costs

Field tests show that the stability of the system is greatly challenged: (1) The purity requirements for NaHS are very high, and the use of lower-purity NaHS will affect the sulfur-dissolving activity of the system; (2) The system will change after two weeks at room temperature. (3) The system activity is obviously affected by the water phase components in the gas well; (4) When it needs to be mixed with condensate oil in some intermittent operations, the system activity is greatly reduced

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