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Amerisur oil discovery boosts Platanillo Field potential onshore Colombia

07th October 2014

Amerisur Resources has announced an update on the well Platanillo-20 in the Platanillo Field, Colombia, the 15th new well of the current drilling campaign, in addition to three successful sidetracks

Amerisur oil discovery boosts Platanillo Field potential onshore Colombia
The petrophysical evaluation and the preliminary observations of the cores taken in Platanillo-20, combined with the T sand test results have confirmed the T sandstone as a separate oil reservoir within the field

"Platanillo-20 is another significant result for the company, with important implications for the overall reserves of the field,” said John Wardle, chief executive officer of Amerisur.

“The test of the T sand was very positive, and since this test is located at some 1,700 metres from the only other T sand test, in Platanillo-2, it gives further support to our view of an important resource existing within that unit which we will continue to define and develop over the next years.

“In addition, the excellent oil quality encountered, even better than our Platanillo U sand crude is very exciting and will add substantial value to our overall field output. Once we have performed a few weeks of LTT we will be able to confirm the development plan for this important new horizon.

“Our business strategy continues to evolve within the Putumayo, soundly based on our Platanillo field, where this recent work demonstrates the important upside yet to come. Our efforts to establish an export connector into Ecuador continue on schedule, as does our exploration work in the Put-12 block. The additional 3D seismic in the north of Platanillo is underway, and I am confident these new, high quality data will demonstrate significant structures to add to our already impressive forward drilling inventory.

“Additionally I welcome the imminent drilling of Libélula-1. This is an exploration prospect and of course carries exploratory risk; however on success it will add additional potential into our already very interesting and important mix of opportunities within the Putumayo basin."

Platanillo-20 was successfully drilled vertically to a total depth of 2,547-metres MD and was cored over the N, U, T and Caballos basal sands. The reservoir cores recovered in Platanillo-20 are being analysed with the objective of physically determining the properties of the reservoirs, which will allow a refinement of the reserves model, as announced in the Interim Results for the six months ended 30 June 2014.

The reservoir sections in Platanillo-20 were logged and log interpretation indicated the presence of 16.7-metres gross, 8.2-metres net oil column in the U sand formation and the presence of 6-metres gross, 4.2-metres net oil column in the T sand formation using both Schlumberger Anadrill Logging While Drilling and Schlumberger wire line tools.

The company performed a production test of the T sand. This is only the second production test of the T sand interval, the first having been performed by the previous operator in Platanillo-2 in 2007.

A total of 1.2-metres of the 4.2-metres net oil pay was perforated and this interval flowed 1,041 BOPD of 38.2 API oil with trace water in natural flow over a 48/64" choke with 84 PSI of flowing pressure at the wellhead.

The well has now been placed on production at approximately 400 BOPD from the T sand interval and an application for a Long Term Test (LTT) of this reservoir will be submitted in the next few days to the Agencia Nacional de Hidrocarburos (ANH).

The petrophysical evaluation and the preliminary observations of the cores taken in Platanillo-20, combined with the T sand test results have confirmed the T sandstone as a separate oil reservoir within the field. Similar pay intervals and reservoir quality have been identified in other wells drilled during the current campaign, including Platanillo-6 (3-metres pay), 7 (7.3-metres pay), 10ST (3.6-metres pay), 11 (5.2-metres pay) and Alea 1R ST1 (1.5-metres pay).

The Serinco Rig D-10 is currently being moved to Platform 1N to drill well Libélula-1. That well will be directional and is classed as an exploratory well whose purpose is to evaluate the productive potential of a new structure identified to the west of the Platanillo field.

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