High-steel-grade anti-sulfur drill pipe material and preparation method thereof

Abstract

The invention provides a high-steel-grade anti-sulfur drill pipe material and a preparation method thereof. The material is formed by the following components (by wt%): 0.15-0.25% of C, 0.20-0.50% of Mn, 0.20-0.30% of Si, 0.50-1.20% of Cr, 0.80-1.5% of Ni, 0.50-1.20% of Mo, 0.01-0.03% of Nb, 0.01-0.03% of V, 0.01-0.03% of Ti, 1.0-3.0% of Al, 0.005-0.01% of La, less than or equal to 0.001% of S, less than or equal to 0.003% of P and the balance of Fe. The preparation method comprises the following steps: selecting raw materials according to the components; smelting, refining and continuously casting the raw materials to obtain a cast ingot; rolling the cast ingot to obtain a tubular product; and carrying out heat treatment on the tubular product to obtain the high-steel-grade anti-sulfur drill pipe material. The strength of the high-steel-grade anti-sulfur drill pipe material disclosed by the invention can reach 105-135ksi.

Description

technical field [0001] The invention relates to a high-grade steel-grade sulfur-resistant drill pipe material and a preparation method thereof, belonging to the technical field of low-carbon alloy steel metal materials. Background technique [0002] The highest steel grade of existing sulfur-resistant drill pipes at home and abroad is 105ksi, including foreign Japanese NKK, French Mannesmann, Grant, and domestic Baosteel, Bohai Nengke and other companies all have 105ksi steel grade sulfur-resistant drill pipes. However, key oil and gas fields in western China, such as Sichuan, Chongqing, and Tarim, generally have a well depth of more than 5,000 meters and contain hydrogen sulfide medium to varying degrees. For these deep wells of more than 5,000 meters, 105ksi steel grade cannot meet the drilling load. High-grade steel drill pipes are very sensitive to hydrogen sulfide stress corrosion cracking. The presence of hydrogen sulfide can easily cause hydrogen sulfide stress corros...

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Problems solved by technology

However, key oil and gas fields in western China, such as Sichuan, Chongqing, and Tarim, generally have a well depth of more than 5,000 meters and contain hydrogen sulfide medium to varying degrees. For these deep wells of more than 5,000 meters, 105ksi steel grade cannot meet the drilling load. High-grade steel drill pipes are very sensitive to hydrogen sulfide stress corrosion cracking. The presence of hydrogen sulfide can easily cause hydrogen sulfide stress corrosion cracking in high-grade steel drill pipes, resulting in accidents such as drilling tool breakage and well drop, which will cause great harm to drilling engineering.

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