@A4,
It all depends on the way the goverment has it on agreement.In the case of UG,Tullow went into a production sharing agreement.Being whom they are,they invited Total and CNOOC in an agreement known as farmdown (Sharing the spoil)....but M7 took them through a tough 18 months as Tullow wanted to export the crude while M7 was for a refinery to benefit the region.He got his way but even then,Tullow still earned 310m USD for the farmdown grimiti which in turn availed capital for building the refinery.
Nothing great was ever achieved without enthusiasm.