* OPEC may ask Libya, Nigeria to cap output
* Libya says ready for dialog but many factors at stake
* U.S. adds rigs in 24 out of last 25 weeks
* Crude prices down 17 percent this year (Updates prices)
LONDON, July 10 (Reuters) - Oil dipped on Monday, paring some earlier losses triggered by rising drilling activity in the United States and no let-up in supply growth from both OPEC and non-OPEC exporters, but the outlook remained gloomy.
Brent crude futures were last down 11 cents on the day at $46.60 a barrel by 1430 GMT, while U.S. crude futures were last down 13 cents at $44.10 a barrel.
"The market is in trouble and looks very vulnerable to lower numbers," PVM brokerage said in a note.
The Organization of the Petroleum Exporting Countries has agreed with some non-OPEC members to curtail production until March 2018 but the move has failed to eliminate a global glut of crude.
Several key OPEC ministers will meet non-OPEC Russia on July 24 in St Petersburg, Russia, to discuss the situation in oil markets.
Kuwait said on Sunday that Nigeria and Libya had been invited to the meeting and their production could be capped earlier than November, when OPEC is scheduled to hold formal talks, according to Bloomberg.
Libya said on Monday it was ready for dialog but added that its political, economic and humanitarian situation should be taken into account in talks on caps.
Brent prices are 17 percent below their 2017 opening despite strong compliance by OPEC with the production-cutting accord.
BNP Paribas joined the growing list of investment banks and analysts that have cut their crude oil price forecasts for the coming year.
"The simple truth is that OPEC and Russia have to contend with the fact is that there is output growth elsewhere diluting their efforts at reducing supply," the bank said in a note.
"We thus have made deep cuts to our crude oil price forecasts. We now see the price of WTI averaging $49/bbl in 2017 (-$8/bbl revision) and that of Brent $51/bbl (-$9/bbl revision)."
U.S. energy firms added seven oil drilling rigs last week, marking a 24th week of increases out of the last 25 and bringing the count to 763, the most since April 2015, energy services company Baker Hughes said. <RIG-OL-USA-BHI>
U.S. oil production <C-OUT-T-EIA> has risen more than 10 percent since mid-2016.
"This is the response of prices to news of increasing oil production in the U.S.," Commerzbank said in a note. "The U.S. Department of Energy reported a marked rise in production that virtually reversed the previous weeks decline."
(Additional reporting by Henning Gloystein in SINGAPORE; Editing by Susan Thomas and Mark Potter)