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Colombia: Shona Energy announces Nelson-2 well in the Esperanza concession as significant gas discovery

31 Jan 2011

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Shona Energy Company, through its wholly-owned subsidiary Geoproduction Oil & Gas Company of Colombia, a Bogota based company, has announced a significant gas discovery and the successful completion of its Nelson-2 well located within the Esperanza concession in the Lower Magdalena Basin of Colombia. This concession is operated and retained 100% by Geoproduction.

The Nelson-2 encountered a 500 feet gas column with 135 feet of net pay as calculated by a third party consultant. Only the upper 48 feet of pay was tested and had production rates of 5800 MCFD with 2638 psi flowing pressure on a 24/64" choke. The calculated absolute open flow rate was 77 MMCFPD. Petrophysical data indicated porosities ranging from 17% to 27% and permeabilities of 600 to 800 md. Based on an extensive 3D survey, the closure is approximately 1600 acres. Reserves, which include proved, probable and possible, have been calculated at 164 BCF by a third party engineering company, Collarini Associates, located in Houston, Texas.

An eleven kilometer 6" gathering pipeline is currently under construction from the Nelson field to the existing natural gas processing facility, Jobo Station. It is expected to be completed the first part of April 2011. The gathering line's capacity is 60 MMCFPD, which will handle future Nelson field development and exploration success in the immediate area. At this time, Geoproduction sells gas at the Jobo Station, which is connected to the national gas transportation network. Discussions are currently underway for gas sales from the Nelson field.


Shona Energy signed a Participation Agreement with Geoproduction Oil and Gas and Ray Oil Tools, for the development of the Esperanza Block in the Lower Magdalena Basin of Northwestern Colombia in February 2007. Discovered by Exxon in the 1970s, the Esperanza Block covers 45,975 hectares or approx. 114,000 acres and includes areas formerly designated as the Jobo, Tablon, Castor, Coral and Sucre gas fields, that have produced approx. 70 BCF of natural gas in the aggregate.

Geoproduction, a Louisiana based company with a branch office in Bogota and Ray Oil Tools a Louisiana based corporation, were awarded The Esperanza Contract in August 2004 by Colombia's Agencie Nacional de Hidrocarbures (ANH). At the time of the Shona Energy deal, Geoproduction engineers estimated the remaining reserves in the three sectors may contain 221 BCF of proved recoverable reserves, and 140 BCF of additional probable, plus possible, reserves.

Source: energy-pedia

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