Conical-face welding type hydrogen sulfide corrosion-resistant boring rod adopting same material and processing process thereof

Abstract

The invention relates to a conical-face welding type hydrogen sulfide corrosion-resistant boring rod adopting the same material and a processing process thereof. A tube body and the joint of the boring rod adopt the same material, and the chemical components of the material are formed by the components by weight percent of 0.22-0.34 percent of C, 0.6-1.1percent of Mn, less than or equal to 0.010 percent of P, less or equal to 0.005 percent of S, 0.6-1.2 percent of Cr, 0.5-1.2 percent of Mo, 0.17-0.35 percent of Si, 0.10-0.30 percent of V, 0.01-0.06 percent of Nb, 0.005-0.03 percent of Ca, less than or equal to 0.030 percent of Al and the balance of Fe and non-removable trace elements. The conical-face welding type hydrogen sulfide corrosion-resistant boring rod adopting the same material and the processing process thereof have the advantage of forming a certain angle between the MnS inclusions on a welding seam flow line and the shape and orientation of a second phase and the diffusion direction of hydrogen atoms to reduce the apparent diffusion coefficient of the hydrogen atoms by changing the metal stream lines distribution of a welding seam of the boring rod, thus solving the ineffective condition existing in the serving progress of the common sulfide-resistant of the welding seam of the boring rod and improving the sulfide-resistant property of the sulfide-resistant boring rod tube body and the welding seam.

Description

technical field [0001] The invention relates to a drill pipe, in particular to a friction-welded anti-hydrogen sulfide corrosion drill pipe and its processing technology. Background technique [0002] Drill pipe is an important part of the drill string and the main tool for drilling. With the rapid development of the world economy, the demand for oil and natural gas continues to increase, and the development of sour oil and gas fields containing hydrogen sulfide is intensified. The failure of drill pipes in sulfur-containing blocks is an increasingly serious problem. [0003] During the service of the drill pipe in the sulfur-containing block, the sulfur resistance performance of the drill pipe is reduced due to the material factors of the drill pipe itself and the characteristics of the conventional processing technology. Mainly manifested in: [0004] First, the purity of the drill pipe material, as well as the number, shape, and orientation of the inclusions have a grea...

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Problems solved by technology

[0007] The object of the present invention is to provide a kind of conical surface welded anti-hydrogen sulfide stress corrosion drill pipe of the same material and its processing technology, mainly by changing the metal streamline distribution of the drill pipe weld, so that the MnS inclusions on the weld streamline And the shape and orientation of the second phase are at a certain angle to the diffusion direction of hydrogen atoms, and the apparent diffusion coefficient of hydrogen atoms is reduced to solve the failure of the existing common sulfur-resistant drill pipe welds in the service process and improve the sulfur-resistant drill pipe. Sulfur resistance of pipe body and weld seam

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