By Georgi Kantchev 

LONDON--Oil prices rose on Friday, after a volatile week that saw the commodity whipsaw between gains and losses.

Crude is still on track to record its fourth consecutive weekly drop, exacerbating a rout in prices that started in the summer. Oil prices have nearly halved since their peak in June, their sharpest fall since the 2008 financial crisis, as fears of oversupply coupled with tepid demand engulfed the market.

Brent, the global average, was up 1.5% in early London trade, flirting with the key $60 mark. On the New York Mercantile Exchange, U.S. light, sweet crude was up nearly a dollar, trading at around $55.

"In the next six to nine months the market will be in test mode as it remains uncertain what the correct oil price is," said Torbjørn Kjus, oil analyst at DNB Markets. "There is potential for short covering rallies but volatility is set to remain high."

On Thursday, crude had rallied by as much as 3% in early trade only to see the gains pared as negative sentiment overwhelmed the market. According to Mr. Kjus, "the market is very much sentiment driven and people seem to be interpreting news bearishly right now."

Bearish news came as key oil ministers from the Organization of the Petroleum Exporting Countries on Thursday underpinned the perception that they are willing to tolerate lower prices to protect their market share.

"The share of OPEC, as well as Saudi Arabia, in the global market has not changed for several years...while the production of other non-OPEC [countries] is rising constantly," Saudi Arabia's Oil Minister Ali al-Naimi said. "In a situation like this, it is difficult, if not impossible, for the kingdom or OPEC, to take any action that may result in lower market share and higher quotas from others, at a time when it is difficult to control prices."

Mr. al-Naimi's comments were later echoed by the energy minister of the United Arab Emirates, Mohamed Faraj Al-Mazrouei, who said that non-OPEC producers "should contribute to fix the imbalance in the market."

"The real cause of the price slump is probably to be found above all in the shift in OPEC strategy which, rather than attempting to keep the market balanced as it did in the past, is now aimed at defending its market shares," Commerzbank said in a note on Friday.

Looking to 2015, however, crude prices could be in for a rebound, especially in the second half of the year, analysts say.

"The decline has gone too far to be sustainable," said Mr. Kjus, who sees the average oil price next year at $70 per barrel. According to him, the rout in prices will lead to lower capital expenditure by oil firms which, in turn, will limit the supply growth. That is especially valid for U.S. shale industry which has experienced a boom in recent years and is largely responsible for the current oil glut.

"Banks are already reluctant to push more money into shale and the bond markets are effectively closed for these players," Mr. Kjus said. "When we end 2015, U.S. oil production probably won't be higher than now and that will help balance the market."

Nymex reformulated gasoline blendstock for January--the benchmark gasoline contract--rose 1.8% to $1.55 a gallon, while ICE gasoil for January changed hands at $549.25 a metric ton, up $4.00 from Thursday's settlement.

Summer Said and Eric Yep contributed to this article.

Write to Georgi Kantchev at georgi.kantchev@wsj.com

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