The U.S. oil and gas rig count pulled back sharply during the week ending Friday (Sept. 22), falling 11 units to 630 amid notable losses in the Permian Basin and the Haynesville Shale, according to the latest Baker Hughes Co. (BKR) data.

A three-rig decline in natural gas rigs domestically partially reversed an eight-rig increase from the week-earlier period. Oil-directed rigs, meanwhile, fell by eight to 507. 

Land drilling accounted for all of the rig declines in the United States for the week, with the Gulf of Mexico count unchanged at 17. Declines included nine horizontal rigs, one directional rig and one vertical rig, the BKR data show.

The combined 630 active U.S. rigs as of Friday compares with 764 rigs running in the year-earlier period, according to the BKR numbers,...