Canadian oil and gas firm Petrobank will begin testing new oil extraction technology at an oil well in Saskatchewan that could position the region as a major force in North American energy production. The toe-to-heel air injection, or THAI, technology is to be trialed on a $12 million, two-well site near Kerrobert. The method allows for greater oil recovery rates and leaves a smaller environmental footprint than other conventional methods. THAI uses underground combustion to heat the bitumen or oil.