While many investors in junior oil stocks head for plays in newly developing fields - off West Africa, or in Central Asia or the Urals - we shouldn't forget the attractions of the good ol' US of A.

The fact that the US is an oil producer of long standing creates some interesting opportunities for smaller oil companies - precisely because some of the fields are so old that the majors have turned their backs on them. In some cases, fields have been produced in the past and abandoned once flow rates fell - but with higher oil prices and relatively new technology, the wells can be stimulated to bring them back into commercial production.

That's what Nighthawk is doing at its Devon Oilfield licence in Kansas, using fluid injection techniques. Pressure in this area of the Cherokee basin is too low to produce otherwise, but fuel injection could potentially get 20-50% recovery rates.

Of course the fact that much of the US has been extensively mapped, and there's good seismic data and even drilling reports on most areas, also reduces the risk for explorers and producers. So Nighthawk's producing portfolio - five properties in Utah, Kansas, Colorado and Illinois - can be seen as a nice low risk bunch of assets. But it also has the potential to surprise on the upside.

Nighthawk listed on AIM in 2007 with a bunch of US assets which it has been developing over the last two years. It has been buying up land that the big players don't want - and is getting oil out of the ground at low cost. CEO Dave Bramhill says its oil is costing USD 25 a barrel, and that will fall further in the future as economies of scale begin to be enjoyed [1] .

The last year has seen the company announcing the results of independent reviews of two of its key assets - Jolly Ranch and Revere. At Jolly Ranch, 10 wells have already been drilled out of a 40 well programme; all of them have encountered commercial oil resources, and six are already producing. Rates of production have been improved by the fact that the company is now allowed to produce from multiple levels in each well (this was previously barred by the regulatory authorities).

An independent review by Schlumberger showed a P50 (most likely oil in place) of 1.462…

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