The latest US shale output figures indicate continued strong growth. But for Texas’ key Permian basin growth may be set to slow. Though the rig count continues to rise, productivity is falling whilst both productivity and output figures for recent months have been revised sharply down.

The latest Drilling Productivity Report (DPR) of the US government’s Energy Information Administration, released 12 June, indicates that the EIA expects collective output from seven key US shale...