Patent ID: 8916983

Claim:
An apparatus to generate power downhole, comprising: a tubular member configured to have a fluid flow therein; and an energy harvesting apparatus, comprising: two or more permanent magnets connected together by a spring and configured to generate a magnetic field; a liquid metal disposed around the two or more permanent magnets; an inductance coil configured to move with respect to the two or more permanent magnets, wherein the inductance coil comprises at least one of a flexible diaphragm, a blade, or a flexible membrane; a conductive fluid; and a pressure changing apparatus having a fluid intake and a fluid outtake, the pressure changing apparatus configured to supply a differential pressure across the energy harvesting apparatus such that the inductance coil moves with respect to the two or more permanent magnets; wherein the energy harvesting apparatus is disposed adjacent to the tubular member and is configured to receive a pressure change inflow from the tubular member via the fluid intake on a first side thereof and is configured to receive a pressure change outflow from the tubular member via the fluid outtake on a second side thereof to induce a current flow at the inductance coil when the conductive fluid flows through the tubular member, the flow of current being enhanced by the conductivity of the conductive fluid.