A corrosion inhibitor coating film pig for high sulfur-containing wet gas gathering and transportation pipeline

Abstract

The invention relates to a corrosion inhibitor film coating pipe cleaning device for a high-sulfur-containing moisture gathering and transportation pipeline. The pipe cleaning device mainly comprises a corrosion inhibitor storage and spray coating cavity, a chemical reagent storage and release cavity and circular corrosion inhibitor film coating brushes. The multiple functions of corrosion inhibitor atomization first-stage spray coating, circular brush rotating second-stage film coating, removal of solid impurities at the front end of the pipe cleaning device and the like are integrated, all-dimensional multi-angle corrosion inhibitor film coating of the inner wall of the pipe is achieved, and the film coating quality is improved. The corrosion inhibitor storage and spray coating cavity is designed, the high-pressure natural gas drives a piston to move, corrosion inhibitor in the cavity is extruded, is sprayed out of small holes in a mist mode and then adheres to the inner wall of the pipe, and therefore the first-stage corrosion inhibitor film coating is achieved. The circular corrosion inhibitor film coating brushes are designed, the high-pressure natural gas drives the circular brushes to rotate, and therefore the corrosion inhibitor which is deposited in the pipe can be uniformly dispersed on the inner wall of the pipeline, and the corrosion inhibitor second-stage film coating is achieved. The chemical reagent storage and release cavity is designed, the solid impurities at the front end of the pipe cleaning device are dissolved by a chemical reagent, and therefore the situation that the pipe cleaning ball collection operation is safe and stable is guaranteed.

Description

technical field [0001] The invention relates to a corrosion inhibitor coating film pig for a high-sulfur wet gas gathering and transportation pipeline, which belongs to the technical field of integrity management of oil and gas pipelines. Background technique [0002] High-sulfur gas fields adopt wet gas gathering and transportation technology. Sulfur deposition in the pipeline and humid environment can easily cause corrosion on the inner wall of the pipeline. This corrosion is generally a destructive localized corrosion, which poses a considerable threat to the safe production of the gas field. [0003] In order to slow down the corrosion of the inner wall of the pipeline, a common practice in high-sulfur gas fields is to launch a corrosion inhibitor coating pig into the pipeline, and use high-pressure natural gas to drive the pig to move in the pipeline, accompanied by the corrosion inhibitor solution in the pig It is sprayed in the form of mist, and the mist-like corrosio...

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Problems solved by technology

[0013] (1) Design the corrosion inhibitor atomized coating chamber and the corrosion inhibitor coating round brush to realize the first-level coating film of the atomized corrosion inhibitor and the second-level coating film of the circular brush, which solves the problem of pigging during the pigging process. The deflection of the atomizing nozzle and the uneven distribution of the corrosion inhibitor at the bottom of the pipeline cause the thickness and quality of the corrosion inhibitor coating film along the pipeline to decrease

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