The present paper is concerned with a new method for downhole energy harvesting from an isothermal well zone. It is shown that in a horizontal well compartment where there is thermal equilibrium, the pressure differential between the sand face and the wellbore can be converted into temperature differential using a vortex tube system. The flow, pressure and temperature measurements using the vortex tube in a physical model are correlated to the amount of energy generated with different pressure ranges expected in the well environment. The data reveal that the energy generated can charge substantially a battery to operate downhole sensors and control devices.

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