Integral processing method for refabrication of waste oil tube

Abstract

The invention relates to an integral processing method for refabrication of a waste oil tube, which comprises the steps of: pretreating: selecting a waste oil tube with wall thickness of above 3mm, dismantling a coupling, detecting magnetic flux leakage, cutting threads, removing oil and scales, aligning, blasting sand, and separating by lengths; lining ceramics: filling melted iron subjected to combustion synthesis into a plough groove and a corrosion groove which are eccentrically worn on the inner wall of the oil tube under the action of centrifugal force in a high-speed rotating centrifuge, metallurgically combining with the inner wall of the oil tube, and melting with a transition iron layer under a ceramic layer into a whole; and processing threads: processing threads at a tube discharging end by using a numerical control lathe and a precise carding tool, coating thread grease, and installing the coupling. A new waste-judging standard is made on the basis of the judging standard of the waste oil tube in an oil field, which greatly reduces the waste quantity of the oil tubes, and increases the quantity of repairable oil tubes. The service life of the repaired waste oil tubes is above 5 times longer than that of the original new oil tube, thus the operation cost of the oil field is greatly lowered.

Description

technical field [0001] The invention belongs to the remanufacturing industry of mechanical and electrical products, and relates to an overall processing method for remanufacturing waste oil pipes by using self-propagating high-temperature synthesis technology. Background technique [0002] The oil pipe is the pipe string steel pipe lowered into the casing of the oil well during the development of the oil and gas field, and it is the channel for the crude oil to be transported from the ground to the surface. At the same time, the oil pipe is also the second type of oil pipe after the casing in the special oil pipe, and the annual consumption of various oil fields in the country can reach hundreds of thousands of tons. Due to corrosion and wear, the service life of oil pipes and line pipes is greatly reduced. Especially with the development of drilling technology, the number of deviated wells and horizontal wells is increasing day by day. Under the action of gravity and exter...

AI Technical Summary

Problems solved by technology

Due to corrosion and wear, the service life of oil pipes and line pipes is greatly reduced. Especially with the development of drilling technology, the number of deviated wells and horizontal wells is increasing day by day. Under the action of gravity and external force, the direct contact with the pipe wall wears seriously, making the service life of ordinary oil pipes less than two years on average

In addition, the corrosive medium in oilfield production fluid mainly contains CO 2 , H 2 S, brine and sulfate-reducing bacteria, etc. These corrosive media cause corrosion and perforation of oil pipes, casings and delivery pipes, making oil wells scrapped and seriously affecting crude oil production