Ultra-high-strength drill pipe expands the drilling envelope (Jul-2009) ///
Drilling teams are evaluating alternative materials and advanced technologies to expand the Extended Reach Drilling (ERD) envelope, since present and future ERD projects exceed the capabilities of conventional steel S-135 drillstring assemblies. One solution under development incorporates a new Ultra-High-Strength Steel (UHSS) with 165-ksi minimum yield strength used in thinner-walled, lighter-weight tubes, compared to conventional steel drillstrings.
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