U.S. working oil rigs rose by one this week to 862, the highest since March 2015, according to data from Baker Hughes. The American rig fleet has expanded on an almost-uninterrupted streak since October.

Demand for the most-advanced drilling gear is on the upswing as explorers deploy so-called “super-spec” rigs to U.S. shale fields, according to Susquehanna International Group LLP.

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