High collapse-resistance and hydrogen sulphide-corrosion-resistant low alloy petroleum case pipe and method of manufacturing the same
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A technology for anti-hydrogen sulfide and oil casing, applied in the direction of metal rolling, furnace type, furnace, etc., can solve the problems of anti-hydrogen sulfide performance and influence, achieve high anti-hydrogen sulfide corrosion performance, improve strength and toughness, alloy The effect of low content
Active Publication Date: 2008-08-20
BAOSHAN IRON & STEEL CO LTD
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However, due to the inevitable melting of nitrogen into the steel, Ti will react with N to form large square TiN before the molten steel is poured, and TiC will nucleate at the interface between TiC and the matrix during the subsequent cooling process The Ti(NC) particles grow further, which adversely affects the resistance to hydrogen sulfide
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[0041] Table 1 shows the composition comparison between the present invention and the prior art. As can be seen from Table 1, the composition of similar products at home and abroad is compared with the composition used in the present invention, and the two are very different. In the present invention, the production of API standard 110 steel grade Φ177.8×9.19 low-alloy oil casing with high collapse resistance and high resistance to hydrogen sulfide corrosion can adopt the chemical composition quality of different embodiments as shown in Table 2 percentage ratio. The mass percentage ratio of chemical components used in the present invention is C: 0.24-0.34%; Mn: 0.35-1.0%; Si: 0.20-0.50%; Cr: 0.4-1.1%; Mo: 0.2-0.7%; 0.07%; Ti: 0.005-0.05%; Nb: 0.01-0.05%; V: 0.05-0.15%; Ni: 0-0.6%; Cu: 0-0.2%; B<0.003%; P<0.015%; S< 0.005%; Ca<0.01%; the balance is Fe and unavoidable impurities.
[0042] The elements resistant to hydrogen sulfide stress corrosion include Cr, Mo, V, Ti, Nb, A...
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Abstract
The invention relates to a low-alloyed petroleum casing pipe with high anti-collapse and high hydrogen sulfide corrosion resistance and a production method. The weight percentages of the chemical components of the low-alloyed petroleum casing pipe are: 0.24-0.34 percent of C, 0.35-1.0 percent of Mn, 0.20-0.50 percent of Si, 0.4-1.1 percent of Cr, 0.2-0.7 percent of Mo, 0.007-0.07 percent of Al, 0.005-0.05 percent of Ti, 0.01-0.05 percent of Nb, 0.05-0.15 percent of V, 0-0.6 percent of Ni, 0-0.2 percent of Cu, less than 0.003 percent of B, less than 0.015 percent of P, less than 0.005 percent of S and less than 0.01 percent of Ca and the rest of Fe and inevitable impurities. The production method comprises: external refining and vacuum degassing, and then Ca treatment, smelting, continuous casting to form round blocker and pipe making, soaking, air cooling after rolling, sawing, and then quenching and tempering heat treatment, heating to 880-900 DEG C, water quenching after heat preservation for 30-60 min, tempering and heat preservation under 680-710 DEG C and hot sizing under 550-650 DEG C, the temperature of hot straightening is more than 450 DEG C. The low-alloyed petroleum casing pipe has better anti-collapse performance and hydrogen sulfide corrosion resistance.
Description
technical field [0001] The invention relates to a low-alloy oil casing for oil and gas wells, in particular to a low-alloy oil casing with high resistance to collapse and hydrogen sulfide corrosion and a production method thereof. Background technique [0002] High anti-collapse tubing and casing is an indispensable special pipe suitable for the completion of oil and gas wells such as deep wells and ultra-deep wells. Water layers and sealing various complex strata to ensure the role of drilling. However, corrosive media such as hydrogen sulfide are common in oilfields such as Tarim and Sichuan in my country, and the oil well pipes used are also severely eroded while being squeezed. It is conceivable that in such a stress corrosion environment, the oil casing will quickly fail and crack, which will not only cause serious economic losses to the oil field, but also affect the normal and safe production of the oil field. [0003] Generally speaking, the crush strength and corr...
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