The US oil-rig count rose this week by 14 to a total of 631, oilfield-services giant Baker Hughes said.

The gas-rig count rose by six to 157. One miscellaneous rig was brought online, and so the total rig count rose by 21 to 789.

The oil-rig count is a key proxy for US production levels and shale-industry investment. Robust output has undermined efforts by the Organization of Petroleum Exporting countries to lift prices by cutting output.

Last week, the oil-rig count rose by eight and t

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