The projects are designed to reduce technical risks in enhanced oil recovery and expand application of EOR methods in conventional and unconventional reservoirs. There is every reason to believe that enhanced oil recovery through huff-and-puff injections in US tight-oil plays could be a technical success across large numbers of wells. However, widespread economic success remains uncertain. The report card for unconventional oil and gas producers from a leading industry analyst is A+ for growth and F- for paying back investors. Wells often end up producing oil and gas far longer than expected.