 Gran Tierra Energy Inc TSX:GTE, LSE:GTE, NYSE-A:GTE, ETR:G1P shares were rising in Wednesday mornings deals as it told investors its paid off its credit facility and confirmed the successful ramp-up in production as new wells were brought online in South America. The Colombia and Ecuador focussed firm, which specialises in enhanced oil recovery, said production has so far averaged 30,556 barrels of oil per day in the second quarter, and, as well have come online the rate for the past sixteen days had reached 33,140 bopd. 