During this period, SHESA has participated in the drilling of several wells:
- 2009 Estella-1 (Operator SHESA): Negative result.
- 2009 -2010: Viura-1 (Operator UFG): Discovery of a conventional natural gas deposit.
- 2013 Viura-3 (Operator UFG): Excellent traces of gas.
- 2017–2018: Viura-1 (Operator UFG)
VIURA is an oil and gas exploration project led by UFG E&P (Unión Fenosa Gas Exploración y Producción, S.A.) on conjunction with SHESA (Sociedad de Hidrocarburos de Euskadi, S.A.) and OGS (Oil and Gas Skills, S.A.). The project is being carried out in the province of La Rioja and was originally associated with the Cameros-2 and Ebro-A exploration licences.
When the Viura-1 well (2009 – 2010) was drilled in the municipal area of Sotés, conventional natural gas was discovered. Following initial drilling, tests were run which showed sufficient production flows to allow the project to continue.
In 2013 the Viura-3 well was drilled in the municipal area of Hornos de Moncalvillo. The well had excellent gas traces.
The first natural gas from the well was introduced into the national network in February 2015, and in early March it began to be commercialised on a continuous basis.
The Royal Decree awarding the VIURA hydrocarbon deposit operating concession was published in the Official State Gazette (BOE) on 25 July 2017.
In October 2017, the Ministry granted authorisation to drill Viura-1 ST3, a sidetrack well from Viura-1. Drilling concluded in February 2018.
Very few seismic lines have been acquired during this phase. However, there has been a spectacular advance in geological understanding of both the surface and subsurface, and this new information has been added to our knowledge of the dynamics of the different oil and gas-bearing systems.
Our understanding of the subsurface has been further increased by reprocessing and re-interpretation of a large number of seismic lines acquired in the past throughout different sectors of the BCB and surroundings. Since it was first set up, Sociedad de Hidrocarburos de Euskadi has played a very important part in this work.
By integrating this geological information with knowledge of the dynamics of oil and gas-bearing systems in the BCB, it has been possible to:
- discover new oil and gas-bearing systems, generally local within the basin.
- extend our knowledge of the oil and gas-bearing systems.
- locate geological structures in different oil and gas-bearing systems with the potential to host accumulations of hydrocarbons.
This substantial boost to our understanding of the dynamics of the different oil and gas-bearing systems in the Basque-Cantabrian Basin should form the basis for future discoveries.