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1、绪言 API(美国石油协会)标准的油井用管中,套管由H—40至P—110(屈服强度77.3—98.4kgf/mm~2,抗张强度87.9kgf/mm~2以上)组成。现在,更多地使用N—80,P—110等高强套管。特别是近些年来,随着石油资源开发规模的扩大,超深油井的开发更盛行起来,超过6,000米的井已比较常见,美国在试掘中已出现9,000米以上的深井。为使连接得很长的套管下到井内,近地表层井口的套管要求有很高的抗张强度。同时要求井底的套管有高的压溃强度
1 INTRODUCTION In the API well (American Petroleum Institute) standard well tubing, the casing consists of H-40 to P-110 (yield strength 77.3-98.4 kgf / mm ~ 2, tensile strength 87.9 kgf / mm ~ 2 or more) . Now, more use of N-80, P-110 and other high-strength casing. Especially in recent years, the development of ultra-deep oil wells has become more prevalent in recent years with the expansion of oil resources development. More than 6,000 meters of wells have become more common. The United States has experienced more than 9,000 meters of deep wells in trial excavations. To allow the well-connected casing to go down into the well, the casing of the near-surface wellhead requires high tensile strength. At the same time require the bottom casing has high crush strength