Gas turbine waste heat utilization

Patent metadata

Field	Value
Publication number	US-11512635-B2
Application number	US-201916583558-A
Country	US
Kind code	B2
Filing date	Sep 26, 2019
Priority date	Sep 26, 2019
Publication date	Nov 29, 2022
Grant date	Nov 29, 2022

Abstract

At a well site, equipment will need a power source, such as a gas turbine, to operate. As the gas turbine operates, wasted energy in the form of heat is produced as a result of the efficiency of the gas turbine. With regards to the present disclosure, the heat may be used for operations and treatments at the well site. An embodiment of the present disclosure is a heat recovery system, comprising a gas turbine; a first heat exchanger, wherein the first heat exchanger is a finned-tube heat exchanger; and a second heat exchanger, wherein the second heat exchanger is a tube and shell heat exchanger, wherein the first heat exchanger is disposed in the flow path of an exhaust stream of the gas turbine, wherein the first heat exchanger is fluidly coupled to the second heat exchanger.

First claim

What is claimed is:

1. A heat recovery system for recovering heat at a well site having a power source adjacent a well, comprising:
a gas turbine comprised in the power source operable to produce heat in the form of an exhaust stream;
a first heat exchanger operable to receive a first fluid, wherein the first heat exchanger is a finned-tube heat exchanger;
a thermal storage tank, wherein the thermal storage tank is operable to:
receive the first fluid from the first heat exchanger;
store a third fluid; and
discharge the third fluid; and

a second heat exchanger, wherein the second heat exchanger is a tube and shell heat exchanger, wherein the second heat exchanger is operable to:
receive the third fluid from the thermal storage tank;
receive a second fluid at a first temperature; and
discharge the second fluid at a second temperature for a well treatment of the well,

wherein the second temperature is greater than the first temperature,
wherein the first heat exchanger is disposed in the flow path of the exhaust stream of the gas turbine,
wherein the first heat exchanger is fluidly coupled to the thermal storage tank,
wherein the thermal storage tank is fluidly coupled to the second heat exchanger, and
wherein the second heat exchanger is fluidly coupled to the well.

2. The heat recovery system of claim 1 , wherein the first heat exchanger comprises a first body, a fluid inlet, a fluid outlet, and a plurality of channels.

3. The heat recovery system of claim 2 , wherein the first body comprises a first end, a second end, a central channel, and opposing sidewalls, wherein the fluid inlet is disposed at the first end, and wherein the fluid outlet is disposed at the second end.

4. The heat recovery system of claim 3 , wherein the opposing sidewalls couple the first end to the second end, wherein the first end and the second end are disposed at opposing ends of the first body, wherein the central channel is an open bore defined by the opposing sidewalls, the first end, and the second end.

5. The heat recovery system of claim 3 , wherein the plurality of channels is disposed within the central channel, wherein each of the plurality of channels is coupled to the fluid inlet and the fluid outlet.

6. The heat recovery system of claim 1 , wherein the second heat exchanger comprises a first fluid inlet, a first fluid outlet, a second fluid inlet, and a second fluid outlet.

7. The heat recovery system of claim 6 , wherein the second heat exchanger comprises a plurality of tubes and a plurality of baffles, wherein the plurality of baffles is configured to secure the plurality of tubes in place within the second heat exchanger.

8. The heat recovery system of claim 7 , wherein the plurality of tubes is coupled to the second fluid inlet and the second fluid outlet.

9. A method of utilizing waste heat at a well site having a power source adjacent a well, comprising: operating a gas turbine comprised in the power source, wherein the operation of the gas turbine produces heat in the form of an exhaust stream; flowing a first fluid into and through a first heat exchanger, wherein the first heat exchanger is a finned-tube heat exchanger; flowing the first fluid into and through a thermal storage tank, wherein the thermal storage tank stores a third fluid, and wherein the first heat exchanger is fluidly coupled to the thermal storage tank; flowing the third fluid into and through a second heat exchanger fluidly coupled to the thermal storage tank, wherein the second heat exchanger is a tube and shell heat exchanger and is operable to:
receive the third fluid from the thermal storage tank;
receive a second fluid at a first temperature; and
discharge the second fluid at a second temperature to the well for a well treatment, wherein the second temperature is greater than the first temperature, wherein the first heat exchanger is disposed in the flow path of the exhaust stream of the gas turbine.

10. The method of claim 9 , further comprising actuating a valve disposed at an outlet of the thermal storage tank.

11. The method of claim 9 , wherein the first fluid is water, glycol, oil, and combinations thereof.

12. The method of claim 9 , wherein the second fluid is a well treatment fluid, water, oil, engine coolant, and combinations thereof.

13. The method of claim 9 , wherein as the first fluid exits the first heat exchanger, the first fluid is at a higher temperature than when the first fluid enters the first heat exchanger.

14. The method of claim 9 , wherein as the first fluid exits the thermal storage tank, the first fluid is at a lower temperature than when the first fluid enters the thermal storage tank and the third fluid is at a higher temperature than when the first fluid enters the thermal storage tank.

15. The method of claim 9 , wherein as the third fluid exits the second heat exchanger, the third fluid is at a lower temperature than when the third fluid enters the second heat exchanger.

16. A heat recovery system for recovering heat at a wellsite adjacent a well, comprising:
a gas turbine operable to produce heat in the form of an exhaust stream, wherein the gas turbine is coupled to a power source located at the well site;
a first heat exchanger operable to receive a first fluid, wherein the first heat exchanger is a finned-tube heat exchanger;
a thermal storage tank, wherein the thermal storage tank is operable to:
receive the first fluid from the first heat exchanger;
store a third fluid; and
discharge the third fluid wherein heat transfer occurs directly between the first and third fluids; and

a second heat exchanger, wherein the second heat exchanger is a tube and shell heat exchanger separate from the thermal storage tank, wherein the second heat exchanger is operable to:
receive the third fluid from the thermal storage tank;
receive a second fluid at a first temperature; and
discharge the second fluid at a second temperature to the well for a well treatment, wherein the second temperature is greater than the first temperature,

wherein the first heat exchanger is disposed in the flow path of the exhaust stream of the gas turbine,
wherein the first heat exchanger is fluidly coupled to the thermal storage tank,
wherein the thermal storage tank is fluidly coupled to the second heat exchanger, and
wherein the second heat exchanger is fluidly coupled to the well.

17. The heat recovery system of claim 1 , wherein heat transfer occurs directly between the first and third fluids.

18. The heat recovery system of claim 1 , wherein the second heat exchanger is separate from the thermal storage tank.

19. The heat recovery system of claim 1 , wherein the well site comprises a hoisting apparatus, a derrick, a pump system and a power source.

Assignees

• Halliburton Energy Services Inc

Inventors

• Hunter Timothy Holiman
• Weightman Glenn Howard
• Stephenson Stanley V

Classifications

• F02C6/18 Primary

  using the waste heat of gas-turbine plants outside the plants themselves, e.g. gas-turbine power heat plants (using waste heat as source of energy for refrigeration plants F25B27/02; using the waste heat of a gasturbine for steam generation or in a steam cycle see F01K23/10) · CPC title

• F05D2220/60

  making use of surplus or waste energy · CPC title

• E21B43/24

  using heat, e.g. steam injection · CPC title

• F28D20/00

  Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 · CPC title

• F05D2260/213

  by the provision of a heat exchanger within the cooling circuit · CPC title