With predictions of 200,000 to 400,000 scf/day, San Leon Energy has described its Lewino-1G2 shale gas well in Poland’s Gdansk W Concession as the country’s most successful vertical frac to date. The company is moving quickly to plan the first Lewino horizontal well with multi-frac stages. SIGMA3 – the stimulation design and modelling and onsite stimulation provider – was part of a services team led by United Oilfield Services (UOS).
After testing two frac strategies in the lower Ordovician, San Leon’s objective for the stimulation program in the upper shale interval was to prove the ability to fracture and enable sustained production. The same strategies would then be applied to a multi-stage stimulated horizontal well in the lower Ordovician – which has superior gas saturation and porosity – intended to open the upper and lower intervals and deliver consistent commercial flow rates.
“SIGMA3 provided engineering expertise for the final frac campaign of the vertical well, and it went exactly as planned,” said Joel Price, Chief Operating Officer, San Leon Energy. “This break-through frac design is critical to the successful shale development in Poland’s Baltic Basin, as well as Europe by association. We are excited about applying these learnings to the upcoming horizontal well with the aim of achieving commercial flow rates.”
After the final frac, the Lewino vertical well yielded sustained production of 45,000 to 60,000 cubic feet of gas per day after partial frac fluid recovery. Using the available flowback data, SIGMA3 performed dynamic simulation modelling to determine the permeability of the upper formation and predicted post-cleanup production of 200,000 to 400,000 standard cubic feet per day.
“The vertical well was the testing ground, enabling us to learn more about the well properties and change the stimulation program to achieve maximum production. We are confident that fracs can be designed in the horizontal well that will cover the entire Ordovician target zone,” said Price. “SIGMA3 and the team concluded that the production from the third frac campaign is coming from the upper half of the formation. The lower interval has even better reservoir characteristics and is our primary target. There is significant upside once the horizontal well is executed.”
“We appreciate the opportunity to play a role in what will be the proving ground for shale optimization and production in Poland,” said Jorge Machnizh, SIGMA3 CEO. “San Leon Energy is a trailblazer, and we are excited that our engineering efforts are contributing to their success.”
SIGMA3 will be participating in frac design and analysis of the upcoming horizontal well, due to drill and frac later this year, which will allow a number of varied frac programs to identify the best approach — from 10 to 30 frac stages as routinely performed in the US.
The results from the Lewino gas well comes as good news to Polish shale development after disappointing results from the Syczyn and Berejow wells in Poland’s Lublin province reported earlier this year. Both wells showed a disappointing total organic content (TOC) of 1.5-2 per cent, compared to 3.3-3.6 per cent in the American Marcellus and Barnett formations.
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