How is the butane added to the subsurface?
A. Oxygen is supplied to the subsurface through a series of injection wells connected to an air compressor. Butane gas is mixed with the airflow stream using a specially designed gas delivery system (Butane Injector 2000 ) that can control the amount of butane gas added to the injection wells. The injection wells are installed with a drill rig and constructed with standard off-the-shelf PVC and steel piping.