bashta/iStock via Getty ImagesEvolution Petroleum (NYSE:EPM) had the Delhi asset for a long time as its either main or only producing asset. Relatively high-cost secondary recovery was therefore the business of the company since its startup. But recently the company has been venturing into both the conventional and unconventional business through the purchase of small interests. This marks a transition into a riskier but lower cost business. If the transition is successful, this could be a very differen ...