By Karolin Schaps
LONDON (Reuters) - Oil prices were steady on Monday, but news of another increase in U.S. drilling activity spread concern over rising output just as many of the world's oil producers are trying to comply with a deal to pump less in an attempt to prop up prices.
The number of active U.S. oil rigs rose to the highest since November 2015 last week, according to Baker Hughes data, showing drillers are taking advantage of oil prices above $50 a barrel.
Global benchmark Brent crude oil prices were down 5 cents at $55.47 a barrel at 1226 GMT, while U.S. crude futures traded up 9 cents at $53.26.
"Brent's performance is flat at the moment but we have three factors that have been weighing on prices: the stronger U.S. dollar, the steady increase in U.S. rig counts and the (latest OPEC compliance data)," said Frank Klumpp, oil analyst at Stuttgart-based Landesbank Baden-Wuerttemberg.
The Organization of the Petroleum Exporting Countries and other producers including Russia agreed to cut output by almost 1.8 million barrels per day (bpd) in the first half of 2017 to relieve a two-year supply overhang.
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First indications of compliance to that deal show that members have cut production by 900,000 barrels per day (bpd) in January, according to Petro-Logistics, a company that tracks OPEC supply.
Tamas Varga, analyst at PVM Oil Associates in London, said the news was "not very encouraging" because it implied that only 75 percent of the OPEC production cut target was being met.
Oil prices have remained above $50 a barrel since producers agreed the deal in December, incentivising drillers in low-cost U.S. shale producing regions to ramp up activity.
"In our view the strong rise in U.S. shale oil rigs is a good thing because it will be needed over the next three years as non-OPEC, non-U.S. crude production continues to be hurt by the deep capex cuts both past and present in that segment," said Bjarne Schieldrop, chief commodities analyst at SEB Markets in Oslo.
He estimates the U.S. rig count will continue rising at a rate of seven rigs per week over the first half of the year.
Iran's oil minister Bijan Zanganeh said on Monday he expected oil prices to remain at around $55 a barrel this yes, according to Mehr news agency.
(Additional reporting by Aaron Sheldrick and Osamu Tsukimori in Tokyo; Editing by David Goodman and Mark Potter)