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

A technology of oil casing and production method, which is applied in the field of low-cost rare earth-containing H2S corrosion-resistant oil casing materials, which can solve the problems of drilling rig ecological environment damage, hydrogen sulfide overflow, scrapping, etc., to ensure H2S corrosion resistance and residual stress The effect of low and broad application prospects

Inactive Publication Date: 2013-12-11
INNER MONGOLIA BAOTOU STEEL UNION
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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

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Embodiment Construction

[0024] Low-cost rare earth-containing anti-H of the present invention 2 The production method of S corroded petroleum casing includes steelmaking production, casing rolling and heat treatment of rolled casing. The production process is briefly described as: converter smelting → LF furnace refining → VD furnace vacuum treatment → round billet continuous casting → round Billet heating→perforation→continuous rolling pipe→diameter reduction→cooling bed cooling→saw cutting→heat treatment→straightening→flaw detection→threading. The specific process is as follows:

[0025] Steelmaking production includes: molten iron pretreatment → top-bottom combined blowing converter smelting → LF furnace refining → VD furnace vacuum treatment → round billet continuous casting. Transport the blast furnace molten iron to the steelmaking desulfurization station for desulfurization pretreatment by spraying magnesium powder. The amount of magnesium powder injected per ton of blast furnace molten iron ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/22C21C1/02C21D8/10
Inventor 宋江波刘金贺景春郭智韬乔爱云姜海龙余泽金
Owner INNER MONGOLIA BAOTOU STEEL UNION
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