Petroleum drilling sulphur-resisting drill pipe and preparation method thereof

Abstract

The invention discloses a petroleum drilling sulphur-resisting drill pipe and a preparation method thereof and relates to the technical field of petroleum drilling equipment. Steel components of a drill pipe body include, by mass, 0.22-0.30% of C, 0.22-0.35% of Si, 0.40-0.55% of Mn, 1.00-1.15% of Cr, 0.40-0.55% of Mo, 0.02-0.05% of V, 0.0005% or less of B, 0.010-0.025% of Nb, 0.005% or less of S, 0.008% or less of P and the balance Fe. The yield strength of the material of the drill pipe reaches 730-780 MPa, the tensile strength of the material of the drill pipe is larger than 820 MPa, the percentage elongation is larger than 16%, and charpy V-shaped notch impact energy is larger than 140 J. The petroleum drilling sulphur-resisting drill pipe passes a 720-hour hydrogen-sulfide-stress-corrosion-resistant test under a NACE standard solution. The petroleum drilling sulphur-resisting drill pipe solves the problems that a drill pipe in the prior art is high in hydrogen sulfide stress corrosion cracking sensitivity, stress corrosion cracking, hydrogen brittleness, cracks and the like of the drill pipe and the situation that the drill pipe loses efficacy can be caused easily, the sensitivity of the drill pipe to H2S stress corrosion can be reduced, the strength, the impact toughness and the corrosion resistance of the drill pipe body are improved, and production requirements are met.

Description

Technical field [0001] The invention relates to the technical field of petroleum drilling equipment, in particular to a sulfur-resistant drill pipe for petroleum drilling and a preparation method thereof. Background technique [0002] Domestic oil and gas resources in Sichuan and Chongqing generally contain H 2 S, and high-grade steel drill pipes are very sensitive to the stress corrosion cracking of hydrogen sulfide. The presence of hydrogen sulfide can easily cause problems such as stress corrosion cracking and hydrogen embrittlement of high-grade steel drill pipes, and cause problems such as fracture and failure of the drill pipe body. , Cause great harm to drilling engineering, and even seriously affect production, so it is necessary to use sulfur-resistant drill pipes. Although sulfur-resistant drill pipes have been produced and applied at home and abroad, the sulfur-resistant drill pipes have hydrogen sulfide stress corrosion resistance and impact resistance. There are sti...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a sulfur-resistant drill pipe for oil drilling and its preparation method, which solves the problem that the drill pipe in the prior art is highly sensitive to stress corrosion cracking of hydrogen sulfide, which is easy to cause stress corrosion cracking of the drill pipe, hydrogen sulfide, etc. Brittleness, fracture, failure and other problems, the present invention greatly reduces the drill pipe to H by improving the material of the drill pipe 2 The sensitivity of S stress corrosion improves the strength, impact toughness and corrosion resistance of the drill pipe body, which can meet the production requirements

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