Petroleum steel tube capable of anti hydrogen sulfide stress corrosion and its manufacturing method

A technology for stress corrosion and petroleum steel pipes, applied in the manufacture of tools, drill pipes, casings, etc., can solve the problems of low threshold value of resistance to hydrogen sulfide stress corrosion, quenching and bending deformation of long steel pipes, and unfavorable resistance to hydrogen sulfide stress corrosion, etc. The effect of good physical and chemical properties

Active Publication Date: 2007-04-18
TIANJIN PIPE GROUP CORP
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Problems solved by technology

[0007] The purpose of the present invention is to provide a hydrogen sulfide stress-corrosion-resistant petroleum steel pipe and its manufacturing method, to solve the problem of extremely adverse effects of harmful elements such as P and S and strip-shaped MnS on the steel pipe's resistance to hydrogen sulfide stress corro

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  • Petroleum steel tube capable of anti hydrogen sulfide stress corrosion and its manufacturing method

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Embodiment Construction

[0018] The present invention is based on the following technical ideas: To solve the technical problem of low threshold value of hydrogen sulfide stress corrosion resistance of high-strength hydrogen sulfide-resistant steel pipes in hydrogen sulfide stress corrosion sensitive areas, harmful elements such as P and S and strip-shaped MnS It has an extremely adverse effect on the steel pipe's resistance to hydrogen sulfide stress corrosion, and at the same time solves the quality problems of quenching, bending deformation and cracks in long steel pipes. According to experimental analysis, sulfide stress corrosion cracking is more likely to occur at normal temperature than at higher or lower than normal temperature. Most researchers believe that the cracking sensitivity is the highest at 24±3°C, and when the temperature is at or above 80°C , Generally, sulfide stress corrosion cracking does not occur. Contains H 2 The solution of S is slightly acidic, and the cracking sensitivity...

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Abstract

The invention offers oil steel pipes which can resist stress corrosion by hydrogen sulfide. Weight proportion of their compound is: C 0.25-0.32%,Si 0.10-0.40%,Mn 0.60-1.20%, P<=0.020%,S<=0.010%,Ni<=0.25%,Cr 0.55-1.20%,Mo 0.10- 0.50%,Cu<=0.30%,Al 0.010-0.040% and the allowances are Fe. Scrap steel and spongy iron or melted iron is taken as melting materials. After arc melting, external refinement and vacuum deaeration, they are cast continuously to get round billiets. Then, they are hot rolled to seamless steel pipes and finally to bushing and oil pipes by heat processing of quench and temper. The steel pipes have good physicochemical property and their indexes all reach or exceed API standard. Threshold value of resisting stress corrosion by hydrogen sulfide reaches 90%SMYS, which precedes the standard request and can be extensively applied in oil-gas field with hydrogen sulfide.

Description

technical field [0001] The invention relates to a hydrogen sulfide stress corrosion resistant petroleum steel pipe with a yield strength lower than 758MPa (110ksi) and a manufacturing method thereof. Background technique [0002] About 1 / 3 of the world's oil and gas fields contain hydrogen sulfide gas. When ordinary steel pipes are used for the exploitation of oil and gas resources containing hydrogen sulfide, under the action of stress and hydrogen sulfide gas, the steel pipes tend to be brittle suddenly when the stress is much lower than its own yield strength (this phenomenon is called sulfide Hydrogen stress corrosion), the mild case will cause the steel pipe column or the whole well to be scrapped, and the severe case will cause a blowout, causing the hydrogen sulfide to overflow together with the oil and gas, causing huge damage to the entire drilling rig and the surrounding ecological environment. Therefore, hydrogen sulfide-resistant steel pipes must be used in the ...

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Application Information

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IPC IPC(8): C22C38/22C22C38/44C22C33/04C21C7/04C21D9/08C21D1/18C21D11/00B21D3/00E21B17/00
CPCY02P10/20
Inventor 严泽生孙开明许文妍邱锋徐志谦王京孙宇孙炜
Owner TIANJIN PIPE GROUP CORP
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