Offshore drilling marine riser resistant to deepwater conquassation and manufacturing method of offshore drilling marine riser

Abstract

The invention discloses an offshore drilling marine riser resistant to deepwater conquassation and a manufacturing method of the offshore drilling marine riser. A pipe material comprises, by mass, 0.04-0.08% of C, 0.10-0.30% of Si, 1.40-1.80% of Mn, 0-0.015% of P, 0-0.002% of S, 0.10-0.50% of Ni, 0.10-0.35% of Cr, 0.10-0.40% of Cu, 0.05-0.35% of Mo, 0.005-0.06% of Nb, 0.01-0.06% of V, 0.005-0.025% of Ti, 0.02-0.06% of Al, 0.002-0.006% of N, 0-0.0005% of B, 0.0015-0.0035% of Ca, and the balance Fe and inevitable impurities, wherein Ti/N equals to 1.5-4.0, and Nb+V+Ti<=0.15. The welding crack sensibility index Pcm is smaller than or equal to 0.19. A pipe material structure is composed of ferrite and bainite, and the fraction of the bainite is larger than 80%. According to the manufacturing method, the submerged arc welding technology in an internal and external multi-wire mode is adopted, the steel pipe total length expanding technology with the expanding ratio being 0.80-1.50% is adopted, a steel pipe is high in strength and toughness and excellent in compressive strength and corrosion resistance, and the offshore drilling marine riser is suitable for deep sea exploration and drilling operation under the complex service condition with the water depth being 1500 m or above.

Description

Technical field: [0001] The invention relates to the technical field of deep-water oil and gas exploration and development and equipment manufacturing, in particular to a deep-water fracturing-resistant marine drilling riser and a manufacturing method thereof. Background technique: [0002] The ocean is extremely rich in oil and gas resources, and its oil resources account for about 34% of the world's total oil resources. In recent years, the largest new oil and gas discoveries in the world are mainly located offshore, and the share of offshore oil reserves and production in global oil production is also increasing. Offshore oil and gas resources are of great significance not only to the entire world oil industry, but also to the development of the future world economy. With the gradual transfer of oil and gas exploration and development from land to sea, equipment for offshore oil and gas exploration and development has become a new focus of attention at home and abroad. ...

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Problems solved by technology

[0006] The invention patent with the publication number CN103556079A published by the Chinese Patent Office on February 5, 2014, the title of the patent is a high-strength riser main pipe with excellent fatigue resistance and its manufacturing method. The chemical composition of the drilling riser of this invention is C0 .04%~0.08%, Si0.15%~0.35%, Mn1.55%~1.85%, P≤0.015%, S≤0.003%, Ni≤0.30%, Cr≤0.30%, Cu≤0.25%, Mo≤ 0.25%, Nb0.02%~0.060%, V≤0.06%, Ti0.008%~0.06%, Al0.010%~0.040%, N≤0.008%, Al / N≥3, Ni+Cu+Mo+Cr ≤0.70%, Nb+V+Ti≤0.12%, its carbon equivalent Ceq≤0.45, cold crack coefficient Pcm≤0.23, the microstructure is acicular ferrite + bainite composite fine-grained structure, providing a The manufacturing method of X80 high-strength and high-dimensional precision drilling riser with anti-fatigue performance, but the mechanical property stability and weldability of the pipeline steel of the invention patent are poor, the strength of the pipe is low, and the toughness of the welded joint is relatively low Low, the compressive strength of the steel pipe is insufficient; in addition, the expansion rate used in the manufacturing process of the steel pipe is low, and the ellipticity of the steel pipe is relatively large, which reduces the crush resistance of the steel pipe

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