Assessment of the deepwater Sirius-2 well offshore Colombia confirmed a discovery with more than 6 Tcf in place, Petrobras announced 5 December.
Petrobras, which operates block GUA-OFF-0 through Petrobras International Braspetro on behalf of partner Ecopetrol, said the discovery could increase Colombia’s current reserves by 200% and that first gas could occur in 2027 if Sirius is deemed commercially viable.
The Sirius-1 and Sirius-2 wells (Fig. 1) were formerly known as the Uchuva wells. According to Ecopetrol, Sirius represents the largest gas discovery in the country’s history. Drilling of the Sirius-2 well began in June in a water depth of 830 m.
The partners said they plan to gather metocean data and combine it with environmental information, bathymetry, and geotechnical and geophysical information so they can plan the subsea production systems and gas pipeline design. Initial expectations are that a gas pipeline will carry gas from four producing wells in the field to an onshore gas treatment facility.
Petrobras said it expects production of about 13 million m3/d for a decade and projects gas production will begin within 3 years of securing all required environmental licenses, with the goal of a launch in 2027 if the discovery is deemed commercially viable.
Petrobras said the partners expect to invest $1.2 billion during the exploratory phase and $2.9 billion for production development, and Petrobras’ portion of this is included in its 2025–29 business plan.
Petrobras holds a 44.44% operating stake in GUA-OFF-0, while Ecopetrol holds the remaining 55.56% stake in the block.
