Baker Hughes BHI, -% on Friday reported that the number of active . rigs drilling for oil declined by two to 756 rigs this week. That marked only the second time the weekly oil-rig count fell this year. Oil-rig numbers had climbed for 23 weeks in a row. The total active . rig count, which includes oil and natural-gas rigs, also fell by one to 940, according to Baker Hughes. Oil prices extended their gains following the data, with August West Texas Intermediate crude CLQ7, +% up 68 cents, or %, at $ a barrel on the New York Mercantile Exchange for the session. It was trading at $ before the data .