High-efficiency and environment-friendly sulfur dissolving agent for treating sulfur deposition under H2S/CO2 (hydrogen sulfide/carbon dioxide) system

Abstract

The invention relates to a formula of a high-efficiency and environment-friendly sulfur dissolving agent for treating sulfur deposition under an H2S / CO2 (hydrogen sulfide / carbon dioxide) system, whichis mainly used for treating the sulfur deposition on a petroleum production platform. The high-efficiency and environment-friendly sulfur dissolving agent is mainly prepared from the following components of 70 to 80wt% of main agent, 15 to 25wt% of cosolvent and 2.5 to 7.5wt% of corrosion inhibitor, wherein the main agent is prepared from Lewis base, dimethyl sulfoxide and water; the cosolvent isprepared from N,N-dimethylacetamide, organic amine and / or a mixture; the corrosion inhibitor is amide and imidazoline quaternary ammonium salt. The high-efficiency and environment-friendly sulfur dissolving agent has the advantages that the sulfur can be dissolved at high efficiency under the synergistic action of components; the application range of temperature is broad, the low-poison and environment-friendly effects are realized, the smelly odor is avoided, and the like; the high-efficiency and environment-friendly sulfur dissolving agent can be widely applied to the field of oilfield chemical engineering, especially the treatment on sulfur deposition under the H2S / CO2 system.

Description

technical field [0001] The present invention relates to a kind of dissolving sulfur agent, relate in particular to a kind of 2 S / CO 2 High-efficiency and environmentally friendly sulfur-dissolving agent for sulfur deposition treatment under the system. Background technique [0002] With the rapid growth of energy demand, a large number of high sulfur content. Oil and gas fields have been developed one after another, H 2 S and CO 2 High sulfur content is the main feature of this type of oil and gas fields, and the problem of sulfur deposition has become increasingly prominent. Sulfur deposits will reduce the permeability and porosity of the formation, block the wellbore, reaction bed and gathering pipeline, etc., resulting in serious consequences such as leakage of sulfur-containing gas and production shutdown. It will not only bring huge losses to the enterprise, but also endanger the safety of people's lives and property. [0003] Adding sulfur dissolving agent is a s...

AI Technical Summary

Problems solved by technology

Although the sulfur solvents of these polysulfides have good sulfur-dissolving ability, they have strong stench, high toxicity and high irritation, which brings inconvenience to the field application and affects the health of the staff and the normal life of the surrounding residents.

[0004] To solve this problem, you can use DMDS-free sulfur solvents, such as CS 2 Although amines, n-heptane, toluene, alkanes, aromatics, etc. also have a certain ability to dissolve sulfur, the amount of sulfur dissolved is small, the speed is slow, the amount is large, and the cost is high, so the application in industry is limited.

Both USP4322307 and USP20090136414 introduced a sulfur-dissolving agent mainly based on alkylnaphthalene. Its application avoids the pressure of environmental protection, but there will be local corrosion problems of the sulfur-dissolving agent on pipelines and desulfurization devices. 2 S / CO 2 more serious under the system

Chinese patent CN 102408886B discloses a high-efficiency odorless sulfur-dissolving agent, the main components of which are sodium hydroxide aqueous solution, sulfolane, N-methylpyrrolidone and N,N-dimethylformamide, which may cause corrosion if no corrosion inhibitor is added In addition, there may be freezing problems at low temperatures, and N,N-dimethylformamide used as a catalyst is unstable and easy to decompose in the presence of sodium hydroxide

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