Blocking remover of gas well shaft

Abstract

The invention relates to a blocking remover of a gas well shaft. The blocking remover comprises, by weight, 5-25% of an alcohol ether compound, 0.5-10% of a dispersant, 1-10% of a cleaning agent, and 0.5-5% of chelating agent, with the balance being a nitrogen-containing polar solvent, wherein the nitrogen-containing polar solvent is one selected from N,N dimethyl formamide, N,N dimethyl acetamide, and N-methyl pyrrolidone, the alcohol ether compound is one selected from glycol-ether, glycol-propyl ether, glycol-butyl ether, and diglycol-ether, the disperant whose micelle particle size is from 20nm to 100nm is a middle-phase microemulsion-type dispersant mixed by kerosene, water, a surfactant and a cosurfactant, the cleaning agent is one selected from allene diamine, acetonitrile and pentylamine, and the chelating agent is one selected from sodium citrate and EDTA. The blocking remover has the advantages that corrosivity is weak, that the speed of dissolving blockage is fast, that the product performance is stable in high temperatures, and that the blocking remover can reduce damages caused by water locking and fouling in areas close to gas wells, and can recover the permeability of storing layers.

Description

technical field [0001] The invention relates to a gas well wellbore plugging removal agent in the process of gas field development, in particular to an organic-inorganic compound composed of corrosion inhibitor lysate, fracturing polymer, foaming agent, drilling mud, inorganic scale and rust in the gas well wellbore. clog. Background technique [0002] In the process of gas well exploitation, the salinity of the produced water is high, and some gas well strings are severely corroded and scaled. Therefore, it is necessary to periodically inject corrosion inhibitors into the wellbore for a long time for gas well anticorrosion. With the prolongation of gas well production time, the joint action of corrosion inhibitor cracking residues, pipe string corrosion products, gas well output fluid and other well-entry agents will cause organic or inorganic blockage in the wellbore of the gas well, resulting in the failure of normal production of the gas well, and even being forced to W...

AI Technical Summary

Problems solved by technology

However, this patent is mainly aimed at unblocking oil well formations, which are highly acidic and highly corrosive; the selected aromatic hydrocarbon solvent and co-solvent ethanol have a low boiling point, are volatile at high temperatures, and dissolve organic matter slowly; the selected paraffin emulsification dispersant Instability at high temperature, limited solubilization ability, it is difficult to overcome the disadvantages of slow dissolution of organic blockages in the process of gas well plugging removal and obvious reservoir damage such as water lock and emulsification caused by the incompatibility of plugging removal agent and gas well formation fluid

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