Energy companies gain as harsh winter disrupts US output

U.S-listed shares of energy companies rise premarket, tracking an increase in oil prices

Brent crude futures LCOc1 up 0.1% at $65.95/barrel; U.S. West Texas Intermediate crude futures CLc1 rise 0.1% to $61.10/barrel

Prices rise as output disruptions in major U.S. crude-producing regions and tensions between the U.S. and Iran boost prices O/R

Top gas and oil cos Exxon XOM.N and Chevron CVX.N rise 1.5% and 1.1%, respectively

Occidental Petroleum OXY.N rises 2.2% and ConocoPhillips COP.N up 1.4%

Oilfield services cos: Halliburton HAL.N up 2% and Schlumberger SLB.N inches up 1.5%

Refiners are also in the green as Marathon Petroleum MPC.N up 1.4% ,Phillips 66 PSX.N rises 1.4% and Baker Hughes BKR.O up ~3%

Separately, BKR late on Sunday, reported an 11% rise in adjusted profit for Q4, as demand for its gas technology equipment and services more than offset weakness in its oilfield services and equipment business