Self-winding power generating systems and methods for downhole environments

Patent metadata

Field	Value
Publication number	US-11434726-B2
Application number	US-202016897557-A
Country	US
Kind code	B2
Filing date	Jun 10, 2020
Priority date	Oct 25, 2018
Publication date	Sep 6, 2022
Grant date	Sep 6, 2022

Abstract

Self-winding power generating device, system, and method are disclosed. The device includes a mechanical winding knob for receiving mechanical energy from a downhole environment, a gear train including a plurality of gears engaged with each other, wherein a first gear in the gear train is operatively connected to the mechanical winding knob, and configured to receive mechanical energy from the mechanical winding knob and transfer the mechanical energy to a second gear in the gear train, a spiral spring attached to one of the gears in the gear train, the spiral spring configured to self-wind and store the mechanical energy upon receiving the mechanical energy from the first gear, and a power generation unit configured to receive the mechanical energy from a last of the plurality of gears and convert the mechanical energy into electrical energy.

First claim

The invention claimed is:

1. A self-winding power generation device comprising:
a mechanical winding knob for receiving mechanical energy from a downhole environment;
a gear train comprising a plurality of gears engaged with each other, wherein a first gear in the gear train is operatively connected to the mechanical winding knob, and configured to receive mechanical energy from the mechanical winding knob and transfer the mechanical energy to a second gear in the gear train;
a spiral spring attached to one of the gears in the gear train, the spiral spring configured to self-wind and store the mechanical energy upon receiving the mechanical energy from the first gear;
a power generation unit configured to receive the mechanical energy from a last of the plurality of gears and convert the mechanical energy into electrical energy; and
a bridge rectifier operatively connected to the power generation unit, the bridge rectifier configured to convert AC, received from the power generation unit, to DC, where
the self-winding power generation device is configured to be dropped down a well and travel with a drilling fluid down the well, out of a bit, then back up an annulus and casing all the way to the surface, where data from the self-winding power generation device is transferred to a computer on a drilling surface.

2. The device according to claim 1 , wherein the spiral spring is further configured to unwind and drive the gear train when there is insufficient transfer of mechanical energy from the first gear.

3. The device according to claim 1 , further comprising:
a power storage unit operatively connected to the bridge rectifier, the power storage unit configured to receive and store DC from the bridge rectifier.

4. The device according to claim 3 , wherein the power storage unit comprises one of ceramic film capacitors, electrolytic capacitors, supercapacitors, double-layer capacitors, or pseudo-capacitors.

5. The device according to claim 3 , further comprising:
at least one sensor that gathers information concerning the downhole environment; and
a microcontroller and transceiver unit configured to manage the power generated by the power generation unit and transmit information gathered by the at least one sensor, wherein the at least one sensor is operatively connected to the microcontroller.

6. The device according to claim 5 , wherein the transceiver unit is configured to communicate over a wireless communication method selected from the group consisting of Wi-Fi, Wi-Fi Direct, Bluetooth, Bluetooth Low Energy, and ZigBee.

7. The device according to claim 5 , further comprising:
a shell for housing one or more of the following:
the gear train, the spiral spring, the power generation unit, the bridge rectifier, the energy storage unit, the at least one sensor, and the microcontroller and transceiver unit.

8. The device according to claim 7 , wherein the shell comprises a material selected from the group consisting of polymeric materials, elastomers, coatings of epoxy, resin-based materials, pyroflask, titanium, steel, silicon carbide, Inconel, a material that can withstand high temperature, high pressure, corrosive and abrasive environments, and a polyether-based polyurethane material with visco-elastic properties to absorb shocks and vibrations.

9. The device according to claim 1 , wherein the power generating unit further comprises:
a first material of one polarity and a second material of opposite polarity to the first material, wherein the first material comes in contact with the second material and are separated from each other upon motion of the gear train so that the two materials have a maximized point of contact and separation to generate maximum power; and
at least one electrode that is connected to the first material or second material, wherein the first and second materials are selected from the group consisting of Polytetrafluoroethylene (PTFE), Polyethylene terephthalate (PET), P oly dimethyl acryl ami de (PDMA), Polydimethylsiloxane (PDMS), Polyimide, Copper, Silver, Aluminum, Lead, Elastomer, Teflon, Kapton, Nylon and Polyester.

10. The device according to claim 9 , wherein the first material is included in a first gear in the gear train, and the second material is included in a second gear adjacent to or in contact with the first gear.

11. The device according to claim 9 , wherein the second material is constant, and the first material is propelled towards the second material by means of a slider crank operatively connected to the last gear in the gear train such that the first material slides over the second material.

12. The device according to claim 9 , wherein the second material is constant, and the first material is propelled towards the second material by means of a slider crank operatively connected to the last gear in the gear train such that the first material slides through the second material.

13. The device according to claim 9 , wherein the second material is constant, and the first material is propelled towards the second material by means of a scotch yoke operatively connected to the last gear in the gear train such that the first material slides over the second material.

14. The device according to claim 9 , wherein the second material is constant, and the first material is propelled towards the second material by means of a scotch yoke operatively connected to the last gear in the gear train such that the first material slides through the second material.

15. The device according to claim 9 , wherein the power generation unit comprises a piezoelectric material.

16. The device according to claim 15 , wherein the piezoelectric material is included as an array in a first gear in the gear train, and the other material is included as an array in a second gear adjacent to or in contact with the first gear.

17. The device according to claim 15 , wherein piezoelectric materials are mounted on a fixed structure, and the other material is included as an array in the last gear, where the piezoelectric materials are stressed and released upon the motion of the gear train.

18. The device according to claim 15 , wherein the piezoelectric material is fixed, and the other material is propelled towards the piezoelectric material by means of a slider-crank operatively connected to the last gear in the gear train so that the piezoelectric material is stressed and released upon the motion of the gear train.

19. The device according to claim 15 , wherein the piezoelectric material is fixed, and the other material is propelled towards the piezoelectric material by means of a scotch-yoke operatively connected to the last gear in the gear train so that the piezoelectric material is stressed and released upon the motion of the gear train.

20. The device according to claim 9 , wherein the power generation unit comprises a magnetostrictive material.

21. The device according to claim 20 , wherein the magnetostrictive material is fixed, and the other material is propelled towards the magnetostrictive material by means of a slider-crank operatively connected to the last gear in the gear train such that the magnetostrictive material is stressed and released upon the motion of the gear train.

22. The device according to claim 20 , wherein the magnetostrictive material is fixed, and the other material is propelled towards the magnetostrictive material by means of a scotch-yoke operatively connected to the last gear in the gear train such that the magnetostrictive materi

Assignees

• Saudi Arabian Oil Co

Inventors

• Gooneratne Chinthaka Pasan
• Li Bodong

Classifications

• F16H21/38

  with means for temporary energy accumulation, e.g. to overcome dead-centre positions · CPC title

• E21B49/00

  Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells · CPC title

• F16H33/02

  Rotary transmissions with mechanical accumulators, e.g. weights, springs, intermittently-connected flywheels · CPC title

• F16H21/36

  without swinging connecting-rod, e.g. with epicyclic parallel motion, slot-and-crank motion · CPC title

• F16H1/20

  involving more than two intermeshing members · CPC title