Crude oil prices surged slightly higher on Friday but were still set for a second consecutive week of losses on doubts that OPEC supply-cut deal have led to balance on an oversupplied market.
June Brent was up 0.82 percent at $51.86 per barrel. Global oil benchmark is near 8.5 percent lower from its April high and is on way for a second straight week of falling.
WTI light sweet crude oil futures rose 0.88 percent to $49.40 per barrel.
Friday's price increase was possible because of OPEC statement that it worked on extension of production cut to ensure a decrease of oversupply. In May, OPEC will settle whether to extend current output limitation.