High grade corrosion resistant raw material pipe blank for offshore oil platform

Abstract

The invention relates to a production technology of steel pipes, particularly to a high grade corrosion resistant raw material pipe blank for an offshore oil platform. The raw material pipe blank comprises the following ingredients: 0.25-0.33 wt% of C, 0.15-0.35 wt% of Si, 0.40-0.60 wt% of Mn, no larger than 0.015 wt% of P, no larger than 0.010 wt% of Si, 0.90-1.10 wt% of Cr, 0.15-0.25 wt% of Mo, no larger than 0.20 wt% of Ni, no larger than 0.20 wt% of Cu, 0.002-0.08 wt% of N, and the balance consisting of Fe. The invention can fundamentally solve the defects of common steel pipes in prior art, resist H2S corrosion, improve the capabilities of resisting uniform corrosion and local corrosion, prevent sulphide stress crack and H-induced crack, and completely adapt to offshore high temperature, high press and high content of H2S and CO2 and other strong corrosion environments, thus the invention can prevent the occurrences of accidents of underground pipeline fracture and leakage of gas collection trunk in oil and gas fields.

Description

technical field [0001] The invention relates to a production process of steel pipes, in particular to a production process of high-grade corrosion-resistant steel pipes for offshore oil platforms. Background technique [0002] With the intensification of my country's oil and gas development, the adoption of new drilling technologies and the improvement of existing drilling technologies, the depth of oil and gas wells is getting deeper and deeper. 2 S, CO 2 The strong corrosive environment that coexists with other oil and gas fields has caused multiple downhole tubing breaks and gas gathering trunk leakage accidents in oil and gas fields, resulting in many oil and gas field wells being scrapped ahead of schedule due to such problems after being put into production for about one year, causing huge losses. [0003] Common corrosion damage in sour oil and gas fields is usually divided into two types: one is uniform corrosion and local corrosion caused by the dissolution of anod...

AI Technical Summary

Problems solved by technology

However, since different anti-corrosion technologies have different anti-corrosion effects, costs, ease of operation and related fronts, the anti-corrosion technologies adopted in an oil and gas field are different, and the anti-corrosion costs and effects are also very different.

In the past, when oil and gas fields decided which anti-corrosion technology to adopt, they mainly considered whether they could effectively solve the corrosion problem of seamless steel pipes, and the initial investment was small, and there was no or little economic evaluation from the perspective of the overall development of oil and gas fields