Sulfur dissolving agent and preparation method and application thereof

Abstract

The invention relates to a sulfur dissolving agent and a preparation method and application thereof. The sulfur dissolving agent contains a highly branched polymer, a polar physical solvent and an inorganic base catalyst, wherein the branching degree of the highly branched polymer is 0.8-1, the molecular weight of the highly branched polymer is 400-10000, and the ends group of the highly branchedpolymer contain 70-100 mol% of amino groups. The sulfur dissolving agent contains the highly branched polymer, and the highly branched polymer structurally contains a large number of branched units, has a large number of end groups, contains a large number of amino groups in the end groups, so the sulfur dissolving capacity of the sulfur dissolving agent is effectively improved, and the polymer isfree of volatility and pungent smell, safer in use and friendlier to environment. The method for preparing the efficient sulfur dissolving agent is simple and convenient in process, can prepare the sulfur dissolving agent only by one-step room-temperature stirring and mixing, and is convenient for preparation and application.

Description

technical field [0001] The present disclosure relates to the technical field of oil and gas field chemicals, in particular to a sulfur dissolving agent and its preparation method and application. Background technique [0002] With the exploitation of high-sulfur gas fields, elemental sulfur will gradually deposit in the gathering and transportation system. A large amount of sulfur deposition will cause blockage of gathering and transportation pipelines and equipment, resulting in a decrease in gathering and transportation capacity, or even shutdown. Once "sulfur blockage" is formed in the production pipeline, the pipeline is very likely to be damaged due to corrosion, pressure suppression, etc., causing serious safety accidents. Therefore, it is necessary to propose effective sulfur deposition prevention and control measures to ensure the safe and stable operation of the gathering and transportation system of high-sulfur gas fields. [0003] Sulfur-dissolving agent pluggin...

AI Technical Summary

Problems solved by technology

CN105199696A discloses a novel high-efficiency polyetheramine sulfur-dissolving agent, which is prepared from polyetheramine, dimethyl sulfoxide and an inorganic base catalyst. It has the advantages of no foul smell, low toxicity, high sulfur solubility, and fast speed. The solubility of sulfur at room temperature can reach more than 90%, but the dimethyl sulfoxide in this patented formula accounts for 70-90%, which has certain toxicity, and its volatilization should be avoided when using it

[0006] In view of the severe clogging of the wellbore of high-sulfur gas wells and the gathering and transportation network of simple sulfur, amine-based compound sulfur-dissolving agents can be used instead of DMDS-based sulfur-dissolving agents, which have the advantages of low toxicity and low odor. Small molecule organic amines are used. On the one hand, some systems have low sulfur solubility and cannot meet the site requirements. On the other hand, small molecule amines still have certain toxicity and irritation.

Images