Highly-efficient blockage remover for sulfur-containing gas well

Abstract

The invention provides a highly-efficient blockage remover for a sulfur-containing gas well. The highly-efficient blockage remover is composed of the following components: 10% to 35% of a high-boiling-point main agent, which is used for dissolving organic obstructions and is composed of ethylene glycol monomethyl ether, ethylene glycol, dimethylformamide, ethylene glycol phenyl ether, petroleum ether and dodecanol; 5% to 10% of an emulsifier, which is compounded from a condensate of fatty alcohol and ethylene oxide, polyoxyethylene sorbitan fatty acid ester and sorbitan fatty acid ester; 7 % to 15% of a surfactant, which is composed of sodium fatty alcohol polyoxyethylene ether sulfate, sodium dodecyl benzene sulfonate, AMALF-32, glyceryl monostearate and polyglyceryl distearate; 5% to 15%of a sulfur-dissolving agent, which is compounded from dimethyl disulfide and diaryl disulfide; 1% to 5% of a metal chelating agent, which is ethylenediaminetetraacetic acid; 8% to 15% of a dispersant, which is a naphthalene sulfonate sodium salt formaldehyde condensate; 3% to 5% of an antioxidant, which is n-octadecanol propionate; 2% to 6% of a scale inhibitor; and a proper amount of an acidity and alkalinity regulator, which is used for regulating a pH value. The blockage remover provided by the invention can resist a temperature of 140 DEG C or above, has an obstruction dissolution rateup to 96%, and has good blockage remover performances to the sulfur-containing gas well in a high-temperature environment.

Description

technical field [0001] The patent of the present invention relates to an auxiliary agent for the exploitation of gas wells in oil fields, in particular to a high-efficiency plugging removal agent for sulfur-containing gas wells. Background technique [0002] In recent years, wellbore blockage accidents have occurred successively at home and abroad. In China, such as Dina 2 gas field, Yuanba gas field, Jingbian gas field, Puguang gas field, Keshen block of Tarim oil field, Songnan gas field, and Qiaokou gas field of Zhongyuan oilfield, etc. There have been varying degrees of wellbore blockage. Some gas fields in the Graf Oilfield in Iraq and the well network in the southeast of the Netherlands also experienced wellbore blockage accidents, which not only affected the normal operation of the gas wells, but also severely restricted the production capacity of gas wells around the world. [0003] During the production process of gas wells in Yuanba area of ​​Sichuan Basin, due to...

AI Technical Summary

Problems solved by technology

[0005] The technical goal of the patent of the present invention is to solve the insufficiency of the blockage removal effect of the existing sulfur-containing gas well wellbore, and to develop a plug-removing agent for organic-inorganic composite blockages in sulfur-containing gas wells. The main components include: dissolve organic blockages High boiling point main agent, emulsifier, surfactant, sulfur dissolver, metal chelating agent, dispersant, antioxidant, cleaning aid, scale inhibitor, acid-base regulator

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