There is a demand in the petroleum industry for high strength casing and tubing steels that have yield strengths exceeding 110,000 psi and yet have acceptable resistance to sulfide stress cracking (SSC). However, contrary to expectations and the desire to simply enhance current steel compositions and processing, there are no easy means to achieve increased strength and maintain or increase the SSC resistance at the same time. Only small incremental increases in performance can be achieved with current conventional tubular manufacturing and the limit of these increases has been reached. This paper will present the factors that increase the SSC resistance of conventional high strength steel tubulars and their limits which have been exhausted at this time. Possible ways forward to meet the challenge of high strength tubulars with good SSC resistance for HPHT wells will be discussed.

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