Patent ID: 8925649
Filing Date: 2015-01-06
Classification: E21B

Abstract:
1. A system to harvest mechanical energy in a wellbore, wherein the mechanical energy comes from motion, the system comprising: a. a pressure housing with an internal chamber, wherein the pressure housing is inside a drilling collar and connected to a sub assembly; b. a pendulous member anchored to the internal chamber, wherein the pendulous member is configured to swing in a pendulum motion as the motion is transferred to the pendulous member from at least one of: c. a plurality of piezoelectric strand bundles, wherein each of the piezoelectric strand bundles is secured to the pendulous member, wherein each of the piezoelectric strand bundles is adapted to swing freely and in parallel with the pendulous member, and wherein each piezoelectric strand bundle comprises a plurality of piezoelectric strands, each piezoelectric strand vibrating as the motion is transferred to the pendulous member; d. a plurality of electrodes, wherein at least two electrodes are connected to each of the piezoelectric strand bundles to receive electricity produced by vibrations of each of the piezoelectric strand; and e. at least one energy storage device for receiving a voltage from the plurality of electrodes.