Colombia’s Moqueta field oil output buoys Gran Tierra

Gran Tierra Energy Inc. has added three appraisal wells to its fourth-quarter program in Moqueta field in Colombia’s Putumayo basin after the Moqueta-11 well tested a combined rate of nearly 1,600 b/d of oil from two zones.

The company said its third-quarter net production averaged 18,900 b/d, 97% oil, in Colombia, 2,800 b/d, 82% oil, in Argentina, and 800 b/d of oil in Brazil. Output was above expectations due to the continued strong reservoir performance by Costayaco field and successful execution of transportation strategies.

Moqueta-11 on the southern flank of the Moqueta structure encountered oil in the T-sandstone and Caballos formations. The well averaged 802 b/d of 27.2° gravity oil with a 0.3% water cut from T-sandstone perforations at 6,812-912 ft measured depth. The well also averaged 756 b/d of 27.4° gravity oil with a 0.3% water cut on a hydraulic jet pump from Caballos perforated at 7,043-7,333 ft MD.

The top of the Villeta T-sandstone is 290 ft lower at Moqueta-11 than the lowest known oil encountered in the field at Moqueta-7 well, suggesting the oil column is 290 ft thicker than previously defined. The gross oil columns are now understood to be 765 ft thick in the Villeta T-sandstone and 960 ft thick in the Caballos.

Results indicate that additional oil potentially exists further down the flank of the Moqueta structure. Moqueta-12, first of the three added appraisal wells, was spudded Sept. 23 and targets a reservoir farther south in a previously untested block 270 ft downdip of the lowest known oil encountered at Moqueta-11.

By yearend, Gran Tierra expects to drill Corunta-1 northeasterly from the Costayaco-17 well pad targeting what is believed to be a downthrown fault block extension west of Moqueta field. Zapotero-1 will target the southeastern part of the Moqueta structure.

Meanwhile, Gran Tierra expects to spud the Miraflor West-1 exploratory well in November on the Guayuyaco block in the Putumayo basin targeting the same Cretaceous sandstone reservoirs encountered at Costayaco and Moqueta oil fields.

On the Llanos-22 block, CEPSA and Gran Tierra expect to reach total depth this month at the Mayalito-1 well that is exploring a shallow prospect and testing deeper hydrocarbon-bearing zones encountered but not tested by the successful Ramiriqui-1 oil discovery well.

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