Downhole conversion of acoustic energy into electrical energy

摘要

A method of providing electrical power downhole involves directing acoustic energy 42 downhole and convening it into electrical energy. The acoustic energy 42 may be provided in the form of waves propagating through a liquid in an annulus 35 between a wellbore wall 34 and well equipment 28 deployed in the wellbore. The converter 44 may be a pressure balanced membrane coupled to a Helmholtz cavity to drive a coil in a magnetic field. Also claimed are methods of generating power by converting mechanical or wave energy into electrical energy.