Sintana Energy Inc. announces that it has been notified by the operator of the Talora Block, Petrodorado Energy Ltd. that the Dorados-1X exploration well, which commenced drilling operations on July 31, 2012, has completed the previously reported flow test program. The company has an undivided 30% private participation interest in the 58,570 acre Talora Block, which is located in Colombia's prolific Magdalena Basin. The original planned total depth for the well by the operator was 9,500 feet (MD) with the Cretaceous Caballos and Tetuan (Albian/Aptian) formations being the primary objectives.

While drilling in the Cretaceous Cenomanian section above these objectives, the well encountered a younger and exceptionally thick sand-prone sequence which has never previously been reported in the basin. This sand-prone section, currently named the 'Dorados Sands,' was encountered from about 5,160 feet (MD) to below 7,000 feet, or around 1,850 feet thick (gross). While drilling, this section (5,160 to 6,035 feet) yielded excellent wet gas and oil shows as measured by both Gas Chromatography and Mass Spectroscopy.

The Economic basement was reached much higher than the prognosis at 7,282 feet (MD), without seeing the Tetuan or Caballos formations and as such, the partnership decided to terminate drilling operations at this depth on September 29, 2012 with the forward plan to log and then production test the extensive 'Dorados Sands.' Due to the deteriorating hole conditions, tool sticking and high levels of mud invasion (7 lost circulation events) it was operationally impossible to run an adequate logging program. All these indicators, log resistivities, oil shows, hydrocarbon components (C1 through C9), hydrocarbon ratios, helium and other trace element relationships are all consistent with a thick hydrocarbon column.

In addition, and very importantly, all these indicators terminate abruptly, still within the sand-prone section, at around 6,030 to 6,050 feet (as stated above), forming compelling evidence of a basal Water Contact with a hydrocarbon column above. In mid-November 2012 a program to flow test up to six sandstone intervals was initiated with a completion and testing rig. Due to significant formation damage which occurred during drilling operations, only a limited amount of additional reservoir data was obtained.

The test results confirm that the sand section is a low-pressure reservoir system and that oil has been emulsified. Geochemical lab analysis from production tests proved that this emulsion contains viable medium gravity crude oil with 20deg API. This provides incontrovertible evidence regarding the severity of the mud invasion and a valid reason as to why certain sandstone intervals with good porosities did not flow during testing.

It is important to note that these low-pressure reservoirs are common in this part of the Basin, including the 126-million barrel Guando Field located only 40 kilometers to SE of the Dorados-1X well.