US 12,345,134 B2
Devices, systems, and methods for downhole power generation
Jonathan Robert Hird, Cambridge (GB); and Andrew David Robinson, Cambridge (GB)
Assigned to SCHLUMBERGER TECHNOLOGY CORPORATION, Sugar Land, TX (US)
Filed by Schlumberger Technology Corporation, Sugar Land, TX (US)
Filed on Sep. 11, 2023, as Appl. No. 18/464,878.
Claims priority of provisional application 63/375,266, filed on Sep. 12, 2022.
Prior Publication US 2024/0084674 A1, Mar. 14, 2024
Int. Cl. E21B 41/00 (2006.01); H02N 2/18 (2006.01)
CPC E21B 41/0085 (2013.01) [H02N 2/188 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A downhole energy harvesting system for use in a wellbore, the downhole energy harvesting system comprising:
a housing subjected to periodic oscillations when deployed in the wellbore, the housing having a pocket recessed in an outer surface or inner surface of the housing;
an energy harvesting device disposed within the pocket and configured to generate electricity based on the periodic oscillations, wherein the energy harvesting device includes a clamp secured to the pocket, a cantilevered body with a first end connected to the clamp and a free second end spaced from the clamp and disposed opposite the first end, and piezoelectric material that extends along at least part of a length of the cantilevered body between the first end and the free second end, wherein the cantilevered body and the piezoelectric material are configured to flex to cause the piezoelectric material to generate electrical alternating current in response to the periodic oscillations, and wherein the free second end of the cantilevered body includes a tuning mass with a track configured to adjust position of the tuning mass at the free second end of the cantilevered body to change resonant frequency of the cantilevered body;
an energy storage device connected to the energy harvesting device;
at least one sensor configured to determine harmonic frequency of the housing when deployed in the wellbore and subjected to the periodic oscillations; and
a controller configured to adjust position of the tuning mass at the free second end of the cantilevered body such that resonant frequency of the cantilevered body corresponds to the harmonic frequency of the housing when deployed in the wellbore and subjected to the periodic oscillations.