I think it is better to check the content of the article you have simply copied and pasted because it is not correct.
PTV now have a 37.5% gross revenue interest in Tartaruga production because they have funded more than their obligational amount of $5.6m. As of September 2011 they had contributed in excess of $6.3m.
Also they have given up their WI in the Reconcavo Basin in favour of a 5% royalty payment in just one block.
The author of the article which you copied and pasted has a reputation on SH far above his capabilities and despite pointing this out to him he still fails to acknowledge his errors which could mislead his many followers.