The price of oil rose $1 (83 pence) on Friday in expectation of a fall in supply of Russian crude. This has helped to assuage fears of a hit to demand in the US due to an Arctic storm affecting transport in the country.
Brent crude was up by 66 cents (50 pence), or 0.8 percent, to $81.64 (£67.80) a barrel by 04:40am GMT.
US West Texas Intermediate (WTI) crude was up to $78.27 (£65) a barrel, up 78 cents (65 pence), or one percent higher.
Serinus Energy plc (LON:SENX) is an international oil company with operations in Romania and Tunisia. The focus of the Company is to enhance shareholder value by growing oil and gas production through the efficient allocation of capital.