* Short covering rally pushed up prices mid-week
* But crude, refined product glut still weighs on market
* Platts Global S&P to buy oil analyst group PIRA
* Yahoo (NASDAQ:YHOO) Messenger tool shuts down
By Henning Gloystein
SINGAPORE, Aug 5 (Reuters) - Oil prices eased in early trading on Friday, but remained well above this week's lows as traders covered short positions after profiting from sharp declines since June.
U.S. West Texas Intermediate (WTI) crude futures CLc1 were trading at $41.81 per barrel at 0029 GMT, down 12 cents from their last close but still up over 6 percent from their low fo the week on Tuesday.
International Brent crude futures LCOc1 were trading at $44.16 per barrel, down 13 cents, but also more than 6 percent up from Tuesday.
Traders said that oil markets were still under pressure from overproduction in crude and also refined products, which has left onshore storage tanks filled to the rims and triggered the chartering of some tankers to store unsold fuel. rises earlier in the week were driven in large part by traders cashing in on short positions that profited from a more than 20 percent price fall in oil between June and early August, they added.
"Oil prices rallied despite little fundamental data. However, with CFTC data showing investors increased their shorts positions the most ever for the week ending 26 July, this suggests a short covering rally," ANZ bank said on Friday.
In other oil market news, Yahoo's standalone messenger software, the main tool used by traders to communicate since the late 1990s, shut down early on Friday, leaving market participants with a fragmented choice of alternatives, including Eikon Messenger, ICE Instant Messaging, Symphony, Bloomberg Messenger, Twitter, and WhatsApp. pricing and analytics, leading commodity price reporting agency S&P Global Platts has signed an agreement to acquire global energy market analysis firm PIRA Energy Group.