In my opinion, it is not tough but an expense. The problem with the small unit is each field is different and you are still producing products that have to go somewhere.
It is cheaper to bring the individual well gas production together into a common gas treat plant as is done all over the world.
The problem at the Bakken, the relative production of gas to oil is so low, it may be a near economic loss of the installation of piping and equipment to the volume of cheap gas produced. This would be even worse if you tried to make individual sized custom units to fit each well profile along with loosing the economy of scale for a large plant.
Small gas turbine or wankel generator units at each well head for the gas, produce wattage from the gas, then send it to the grid? Yes I know expensive again, but again I look forward to your reply.
Well, there’s hooking the outflow directly up to a Fuel Cell for electricity like the one sold by Fuelcell Energy, Inc.
They have a couple different types for cesspools and natural gas.
Might be worth looking at.