Jan 18 (Reuters) - Petro Vista Energy Corp PTV.V :
* Executes binding defintive agreement for the sale of interest in tartaruga
block
* Deal for C$2.5 million
* Says company and maha have also entered into a loan agreement
* Says loan proceeds will only be repayable in the event the transaction does
not complete
* Source text for Eikon Further company coverage PTV.V