Low-cost rare earth-containing anti-H2S corrosion petroleum casing pipe material and production method thereof

Abstract

The invention discloses a low-cost rare earth-containing anti-H2S corrosion petroleum casing pipe material. The low-cost rare earth-containing anti-H2S corrosion petroleum casing pipe material comprises the following chemical components in percentage by mass: 0.18-0.23% of C, 0.15-0.23% of Si, 0.50-0.70% of Mn, less than or equal to 0.015% of P, less than or equal to 0.05% of S, 0.010-0.030% of Al, 0.80-1.00% of Cr, 0.20-0.30% of Mn, 0.0015-0.0020% of Ca, less than or equal to 0.03% of La and the balance of matrix Fe and impurity elements. The invention also discloses a production method of the low-cost rare earth-containing anti-H2S corrosion petroleum casing pipe material. The low-cost rare earth-containing anti-H2S corrosion petroleum casing pipe material has the advantages of relatively low cost, good plasticity, low crack sensitivity, low residual stress, good hardenability, stable performance and relatively high percentage of elongation.

Description

technical field [0001] The invention relates to the field of ferrous metal smelting and metal pressure processing, in particular to a low-cost rare earth-containing anti-H 2 S corroded petroleum casing materials and their production methods. Background technique [0002] About 1 / 3 of the world's oil and gas fields contain hydrogen sulfide gas. Such as the Baloma Oilfield in the United States and the Pincher Bay Oilfield in Canada. When ordinary casing is used for the exploitation of oil and gas resources containing hydrogen sulfide, under the action of stress and hydrogen sulfide gas, the casing will often be brittle suddenly when the stress is much lower than its own yield strength (this phenomenon is called for hydrogen sulfide stress corrosion). The lighter ones will cause the casing string or the entire well to be scrapped, and the more serious ones will cause blowout, causing hydrogen sulfide to overflow together with the oil and gas, causing huge damage to the entir...

AI Technical Summary

Problems solved by technology

In the light case, the casing string or the whole well will be scrapped; in the severe case, the blowout will cause hydrogen sulfide to overflow together with the oil and gas, causing huge damage to the entire drilling rig and the surrounding ecological environment

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