Hydrate mitigation in a pipeline with vortex tubes

Patent metadata

Field	Value
Publication number	US-11998959-B2
Application number	US-202117164131-A
Country	US
Kind code	B2
Filing date	Feb 1, 2021
Priority date	Feb 1, 2021
Publication date	Jun 4, 2024
Grant date	Jun 4, 2024

Abstract

A system to prevent the formation of hydrates in a pipeline includes a heater assembly. The heater assembly has a vortex tube mounted on an outer surface of a first section of the pipeline and a compressed gas source. The vortex tube is configured to separate gas from an inlet into a hot gas pathway and a cold gas pathway. The vortex tube includes an inlet, a cold gas outlet, and a hot gas outlet. The hot gas outlet of the vortex tube is fluidly connected to an opening defined in the first section of the pipeline. The hot gas outlet is configured to flow hot gas from the vortex tube into an interior volume of the pipeline. The compressed gas source is fluidly connected to the inlet of the vortex tube.

First claim

What is claimed is:

1. A system to prevent the formation of hydrates in a pipeline; the system comprising:
a heater assembly comprising:
a vortex tube mounted on an outer surface of a first section of the pipeline, wherein the vortex tube is configured to separate gas from an inlet into a hot gas pathway and a cold gas pathway; wherein the vortex tube comprises:
the inlet,
a cold gas outlet, wherein the cold gas outlet is configured to vent cold gas from the cold gas pathway to the environment, and
a hot gas outlet, wherein the hot gas outlet of the vortex tube is fluidly connected to an opening defined in the first section of the pipeline, wherein the hot gas outlet is configured to flow hot gas from the vortex tube into an interior volume of the pipeline; and

a compressed gas source fluidly connected to the inlet of the vortex tube.

2. The system according to claim 1 , wherein the heater assembly comprises a compressed fluid line connects the compressed gas source to the inlet of the vortex tube.

3. The system according to claim 2 , wherein a valve is mounted on the compressed fluid line, wherein the valve is configured to control a volume of compressed fluid that enters the vortex tube.

4. The system according to claim 3 , further comprising:
one or more processors; and
a computer-readable medium storing instructions executable by the one or more processors to perform operations comprising:
receiving signals from a temperature sensor arranged in the pipeline downstream of the opening of the pipeline; and
controlling the valve mounted on the compressed fluid line to increase or decrease an amount of hot air entering the pipeline from the vortex tube.

5. The system according to claim 1 , wherein the heater assembly comprises a fluid tubing connects the hot gas outlet of the vortex tube to the opening of the pipeline.

6. The system according to claim 5 , wherein a valve is mounted on the fluid tubing, wherein the valve is configured to control a volume of hot gas that enters the pipeline by the opening.

7. The system according to claim 6 , further comprising:
one or more processors; and
a computer-readable medium storing instructions executable by the one or more processors to perform operations comprising:
receiving signals from a temperature sensor arranged in the pipeline downstream of the opening of the pipeline; and
controlling the valve mounted on the fluid tubing to increase or decrease an amount of hot gas entering the pipeline from the vortex tube.

8. The system according to claim 1 , wherein the hot gas pathway of the vortex tube extends from the inlet of the vortex tube to the hot gas outlet of the vortex tube.

9. The system according to claim 1 , wherein the cold gas pathway of the vortex tube extends from the inlet of the vortex tube to the cold gas outlet of the vortex tube.

10. The system according to claim 1 , further comprising at least one temperature sensor arranged in the interior volume of the first section of the pipeline.

11. The system according to claim 1 , further comprising at least one pressure sensor arranged in the interior volume of the first section of the pipeline.

12. The system according to claim 1 , wherein the compressed gas source contains a compressed nitrogen gas.

13. The system according to claim 1 , wherein the heater assembly is mounted to an exterior surface of the pipeline.

14. The system according to claim 1 , wherein the pipeline is configured to flow a natural gas fluid, wherein the compressed fluid source is configured to contain a compressed gas, wherein the compressed gas and the natural gas fluid are different.

15. A system to prevent the formation of hydrates in a pipeline comprises:
a first heater assembly comprising:
a first vortex tube mounted on a first section of the pipeline, the first vortex tube comprising:
a first inlet,
a first cold gas outlet, wherein the first cold gas outlet is configured to vent cold gas generated by the first vortex tube to the environment, and
a first hot gas outlet, wherein the first hot gas outlet of the first vortex tube is fluidly connected to a first opening of the first section of the pipeline; and

a second heater assembly comprising:
a second vortex tube mounted on a second section of the pipeline in fluid commination with the first section, the second vortex tube comprising:
a second inlet,
a second cold gas outlet, and
a second hot gas outlet, wherein the second hot gas outlet of the second vortex tube is fluidly connected to a second opening of the second section of the pipeline.

16. The system according to claim 15 , further comprising a first compressed gas source fluidly connected to the first inlet of the first vortex tube.

17. The system according to claim 16 , wherein the first compressed gas source is fluidly connected to the second inlet of the second vortex tube.

18. The system according to claim 16 , further comprising a second compressed gas source fluidly connected to the second inlet of the second vortex tube.

19. The system according to claim 15 , further comprising at least one temperature sensor arranged in an interior volume of the first section or the second section of the pipeline.

20. The system according to claim 19 , wherein the at least one temperature sensor is mounted on an inner surface of the first section of the pipeline, the inner surface of the second section of the pipeline, or both the inner surface of the first section and an inner surface of the second section.

21. The system according to claim 15 , further comprising a heater assembly comprising a third vortex tube mounted on an outer surface of a third section of the pipeline.

22. The system according to claim 15 , wherein the pipeline is configured to flow a natural gas fluid, wherein the compressed fluid source is configured to contain a compressed gas, wherein the compressed gas and the natural gas fluid are different.

23. The system according to claim 15 , wherein the first heater and the second heater are mounted to an exterior surface of the pipeline.

24. The system according to claim 18 , wherein at least one of the first compressed gas source and the second compressed gas source contain a compressed nitrogen gas.

25. The system according to claim 18 , wherein at least one of the first compressed gas source and the second compressed gas source are mounted to an exterior surface of the pipeline.

Assignees

• Saudi Arabian Oil Co

Inventors

• Rizq Ahmad Noor Al-Deen Hassan

Classifications

• B08B9/032 Primary

  by the mechanical action of a moving fluid, e.g. by flushing (B08B9/04 takes precedence {; by fluid jets mounted on cleaning devices B08B9/0433}) · CPC title

• F16L58/00

  Protection of pipes or pipe fittings against corrosion or incrustation (compound tubes F16L9/14) · CPC title

• F17C5/06

  for filling with compressed gases · CPC title

• F17C2221/033

  Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG · CPC title

• F17C2223/0161

  cryogenic, e.g. LNG, GNL, PLNG · CPC title