Internal coating anticorrosion process of pipe for oil exploitation

Abstract

The invention discloses an internal coating anticorrosion process of a pipe for oil exploitation. The process includes the following steps that (1) the pipe is placed in a hot cleaning furnace, and various greasy dirt and impurities on the inner wall of the pipe are carbonized; (2) the inner wall of the pipe is subjected to surface treatment by two-stage abrasive blasting, treatment conditions of the inner wall are fully and automatically checked, and the inner wall is blown after the treatment is qualified; (3) an A component and B component of double-component epoxy coating TC3000I are mixed according to the proportion of an instruction book, the mixed coating is used for performing one-time spray coating on the inner wall of the pipe, and solidification is performed at normal temperatures; and (4) leak point detection is performed after solidification, and if a leak point is absent, the pipe is qualified. By means of the pipe subjected to internal coating anticorrosion by the internal coating anticorrosion process, the fluid efficiency in an oil well pipe can be improved by above 25%, simultaneously, abrasive resistance, chemical resistance and corrosion resistance of the pipe can be improved, the pipe can be used for a long time at the temperature below 120 DEG C, the application range of the pipe is further widened, and positive effects are achieved on reducing oil exploitation costs.

Description

technical field [0001] The invention relates to an anticorrosion process for pipes, in particular to an inner coating anticorrosion process for pipes used in petroleum exploitation. Background technique [0002] At present, the special equipment and various pipe networks of oil and gas gathering and transportation systems and water injection systems are severely corroded due to the corrosion of oil and gas well output and surrounding soil, which often cause corrosion and perforation, energy waste and environmental pollution. Thousands of corrosion failure accidents occur in oilfields across the country every year. In addition to wasting a lot of raw materials, some of them will cause serious environmental pollution and personal casualties. The economic losses caused by corrosion in China's oil industry every year are quite alarming. In the current oil exploitation industry, pipes with single-component coating and single-coating process are mostly used. Generally, when used ...

AI Technical Summary

Problems solved by technology

The existing internal anti-corrosion process for oil pipes requires the use of chemical dosing and high-pressure steam thermal wax removal technology to treat the inner surface of the pipes, which is expensive and causes a lot of pollution; especially the traditional single-component single-coating process, The internal anti-corrosion performance has great application restrictions