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深井进军。石油钻采用管的强度随之也在向更高级别发展。虽然在强度级别上国外已出现了屈服强度为87.9—109.0Kg/mm~2的Soo—125、SM—125、RM—125;屈服强度大于98.4K g/mm~2 的Soo—140、E HS—140、RS—140;屈服强度为105.0—126.5Kg/mm~2的V—150、SM—150;以及强度更高的E H-S-170(σs≥119.2Kg/mm~2)、X-200(σs≥140.0Kg/mm~2);但目前广泛使用的套管,仍然以J—55级为主(σs=38.7—56.2Kg/mm~2),一般都占其套管使用总量的一半以上。N—80(σs=56.2
Deep into. The strength of oil drilling pipe is followed by a higher level. Although Soo-125, SM-125, and RM-125 with yield strengths of 87.9-109.0 kg / mm ~ 2 have been found abroad at the intensity level; Soo-140 with a yield strength of more than 98.4 kg / mm ~ -140, RS-140; V-150, SM-150 with a yield strength of 105.0-126.5 Kg / mm ~ 2 and E HS-170 with a higher strength (σs ≥ 119.2 Kg / (σs≥140.0Kg / mm ~ 2). However, the most commonly used casing is still J-55 (σs = 38.7-56.2Kg / mm ~ 2), which generally accounts for the total amount of casing used more than half. N-80 (σs = 56.2