Environmentally Powered Transmitter for Location Identification of Wellbores

• US 20130248169A1
• Filed: 03/23/2012
• Published: 09/26/2013
• Est. Priority Date: 03/23/2012
• Status: Active Grant

• Current Assignee: Baker Hughes Holdings LLC (Baker Hughes Company)
• Original Assignee: Baker Hughes Incorporated (Baker Hughes Company)
• Inventors: Swanson, Aaron R., Frost, Elton Jr., Dwyer, James P.
• Granted Patent: US 9,091,144 B2
• Time in Patent Office: Days
• US Class Current: 166/244.1
• CPC Class Codes: E21B 41/0085 Adaptations of electric power generating means for use in boreholes
• CPC Class Codes: E21B 41/02 in situ inhibition of corrosion in boreholes or wells

Abstract

A method, apparatus and system for performing an operation in a borehole is disclosed. A device is disposed in a downhole environment of the borehole to perform the downhole operation. An energy harvesting unit coupled to the device harvests energy from an energy source in a downhole environment of the device and provides the harvested energy to the device to perform the downhole operation.

Claims

1. A method of performing an operation in a wellbore, comprising:

disposing a device in a downhole environment of the wellbore;

harvesting energy from an energy source in the downhole environment; and

using the harvested energy to power the device in the wellbore to perform the operation.

2. The method of claim 1, wherein the energy source in the downhole environment is selected from the group consisting of:

(i) a formation surrounding the wellbore;

(ii) a casing in the wellbore; and

(iii) an electrical instrument operating in the wellbore.

3. The method of claim 1, wherein harvesting energy further comprises coupling a first electrode to a first formation layer having a first electrochemical potential and coupling a second electrode to a second formation layer having a second electrochemical potential different from the first electrochemical potential to obtain a current.

4. The method of claim 1, wherein harvesting energy further comprises obtaining an electric current in response to radiation received from a formation.

5. The method of claim 1, wherein harvesting energy further comprises inducing an electric current in response to an electromagnetic field resulting from at least one of:

(i) a cathodic protection operation for a casing in the wellbore; and

(ii) operation of an electrical instrument in the wellbore.

6. The method of claim 1, further comprising storing the harvested energy at an energy storage unit in the wellbore.

7. The method of claim 6, wherein storing the harvested energy further comprises charging at least one capacitor using the harvested energy and discharging the at least one capacitor to store the energy at a rechargeable energy source of the energy storage unit.

8. An apparatus for performing a downhole operation, comprising:

a device disposed downhole configured to perform the downhole operation; and

an energy harvesting unit coupled to the device configured to harvest energy from an energy source in a downhole environment of the device and to provide the harvested energy to the device to perform the downhole operation.

9. The apparatus of claim 8, wherein the energy harvesting unit is further configured to harvest energy from one selected from the group consisting of:

(i) a formation surrounding the wellbore;

(ii) a casing in the wellbore; and

(iii) an electrical instrument operating in the wellbore.

10. The apparatus of claim 9, wherein the energy harvesting unit further comprises a first electrode configured to couple to a first formation layer having a first electrochemical potential and a second electrode configured to couple to a second formation layer having a second electrochemical potential different from the first electrochemical potential to obtain a current at the energy harvesting unit.

11. The apparatus of claim 9, wherein the energy harvesting unit further comprises a detector configured to receive radiation from a formation and produce an electric current in response to the received radiation.

12. The apparatus of claim 9, wherein the energy harvesting unit further comprises an induction coil configured to produce an electric current induced by an electromagnetic field resulting from at least one of:

(i) a cathodic protection operation for a casing in the wellbore; and

(ii) operation of an electrical instrument in the wellbore.

13. The apparatus of claim 9, further comprising an energy storage unit configured to store the harvested energy in the wellbore.

14. The apparatus of claim 13, wherein the energy storage unit further comprises:

(i) at least one capacitor configured to accumulate a charge using the harvested energy, and

(ii) a rechargeable energy source, wherein the at least one capacitor is further configured to recharge the rechargeable energy source.

15. A completion system, comprising:

a casing disposed in a wellbore;

a device disposed in the wellbore proximate the casing configured to perform a downhole operation; and

an energy harvesting unit disposed in the wellbore coupled to the device configured to harvest energy from an energy source in a downhole environment of the device and to provide the harvested energy to the device to perform the downhole operation.

16. The completion system of claim 15, wherein the energy harvesting unit is further configured to harvest energy from one selected from the group consisting of:

(i) a formation surrounding the wellbore;

(ii) a casing in the wellbore; and

(iii) an electrical instrument operating in the wellbore.

17. The completion system of claim 15, wherein the energy harvesting unit further comprises a first electrode configured to couple to a first formation layer having a first electrochemical potential and a second electrode configured to couple to a second formation layer having a second electrochemical potential different from the first electrochemical potential to obtain a current at the energy harvesting unit.

18. The completion system of claim 15, wherein the energy harvesting unit further comprises a detector configured to receive radiation from a formation and produce an electric current in response to the received radiation.

19. The completion system of claim 15, wherein the energy harvesting unit further comprises an induction coil configured to produce an electric current induced by an electromagnetic field resulting from at least one of:

(i) a cathodic protection operation for a casing in the wellbore; and

(ii) operation of an electrical instrument in the wellbore.

20. The completion system of claim 15, further comprising an energy storage unit that includes:

(i) at least one capacitor configured to accumulate a charge using the harvested energy, and

(ii) a rechargeable energy source, wherein the at least one capacitor is further configured to recharge the rechargeable energy source.