Processing fluid from a well

Patent metadata

Field	Value
Publication number	US-10113120-B2
Application number	US-201214428302-A
Country	US
Kind code	B2
Filing date	Sep 14, 2012
Priority date	Sep 14, 2012
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

Abstract

Methods and apparatus for processing fluid from a well are described. A first wall portion may define a first region and a second wall portion may define a second region, fluid from said well being let through those regions. Heating of said first wall portion may be performed to release wax from said first wall portion into said fluid at said first flow region. During said heating, cooling of said fluid at said second flow region may be performed to cause wax from said fluid to deposit on said second wall portion.

First claim

The invention claimed is:

1. Apparatus for processing fluid from a well, the apparatus comprising:
a first wall portion adjacent a first region;
a second wall portion adjacent a second region;
said first and second regions arranged to let fluid pass therethrough;
the apparatus further comprising:
a first heat exchanger which includes said first wall portion, said first heat exchanger being arranged to heat said first wall portion to release wax from said first wall portion into said fluid at said first region; and
a second heat exchanger which includes said second wall portion, said second heat exchanger being arranged in a first configuration to cool said fluid at said second region during said heating of the first wall portion to cause wax from said fluid to deposit on said second wall portion, wherein said second heat exchanger is operable in said first configuration to cool said fluid at said second region, and in a second configuration, different from said first configuration, to heat said second wall portion to release wax from the second wall portion into said fluid; and
an outlet arranged to receive therein said fluid from said first and second regions,
wherein the first heat exchanger and the second heat exchanger are disposed in a parallel configuration.

2. The apparatus as claimed in claim 1 , wherein said second region is arranged to receive said fluid from the first region.

3. The apparatus as claimed in claim 1 , wherein said first region is arranged to receive said fluid from the second region.

4. The apparatus as claimed in claim 1 , arranged to switch between a first mode of operation in which said second region is arranged to receive said fluid from the first region and a second mode of operation in which said first region is arranged to receive fluid from said second region.

5. The apparatus as claimed in claim 1 , further comprising a third wall portion adjacent a third region, the first, second and third regions being arranged to let said fluid pass therethrough, said outlet being arranged to receive said fluid from said first, second and third regions.

6. The apparatus as claimed in claim 5 , wherein said second region is arranged to receive said fluid from the first region, and said third region is arranged to receive said fluid from said second region.

7. The apparatus as claimed in claim 5 , wherein said first region is arranged to receive said fluid from said second region, and said third region is arranged to receive said fluid from said first region.

8. The apparatus as claimed in claim 1 , wherein said first heat exchanger is operable in one configuration to perform said heating and in another configuration to cool said fluid to cause wax to deposit on said first wall portion.

9. The apparatus as claimed in claim 5 , further comprising a third heat exchanger which includes said third wall portion, said third heat exchanger being configured to cool the well fluid at the third wall portion during heating of the first wall portion.

10. The apparatus as claimed in claim 9 , wherein the third heat exchanger is operable in one configuration to perform said cooling at the third wall portion and in another configuration to heat said third wall portion to release wax from the third wall portion into the fluid.

11. The apparatus as claimed in claim 1 , wherein: in a first mode of operation of the apparatus, said first heat exchanger is arranged to heat said first wall portion to release wax from the first wall portion into said fluid; and said second heat exchanger is arranged to cool said fluid to cause wax to deposit on said second wall portion.

12. The apparatus as claimed in claim 11 , wherein:
in a second mode of operation of the apparatus, said first heat exchanger is arranged to cool said fluid to cause wax to deposit on said first wall portion; and said second heat exchanger is arranged to heat said second wall portion to release pre-deposited wax from the second wall portion into said fluid.

13. The apparatus as claimed in claim 9 , wherein in a first mode of operation of the apparatus, said first heat exchanger is arranged to heat said first wall portion to release wax from the first wall portion into said fluid; and said second heat exchanger is arranged to cool said fluid to cause wax to deposit on said second wall portion and in both the first and second modes, the third heat exchanger is arranged to cool said fluid to cause wax to deposit on said third wall portion.

14. The apparatus as claimed in claim 12 , wherein:
in a third mode of operation of the apparatus, said first and second heat exchangers are each arranged to cool said fluid to cause wax to deposit in respective first and second wall portions, and said third heat exchanger is arranged to heat said third wall portion to release wax into said fluid.

15. The apparatus as claimed in claim 11 , wherein:
in a fourth mode of operation of the apparatus, each heat exchanger is arranged to cool the fluid to cause wax to deposit on the respective wall portions.

16. The apparatus as claimed in claim 12 , arranged to be switched between any of:
i. the first and second modes of operation;
ii. the first and third modes of operation;
iii. the second and third modes; or
iv. the fourth mode and any of the first to third modes.

17. The apparatus as claimed in claim 11 , wherein in the first mode of operation, a first amount of said fluid is supplied from the first region to the third region, and a second amount of said fluid is supplied from the first region to the outlet.

18. The apparatus as claimed in claim 9 , wherein the first, second and/or third heat exchangers comprises a first, second and/or third pipe which comprises said first, second and/or third wall portion, and wherein said first, second and/or third region is defined within said pipe.

19. The apparatus as claimed in claim 18 , wherein said heat exchanger comprises a heat exchange chamber surrounding said pipe, said heat exchange chamber arranged to receive heat exchange fluid, for transferring heat across said wall portion between said fluid and the heat exchange fluid.

20. The apparatus as claimed in claim 19 , comprising a shell surrounding said pipe to define said chamber.

21. The apparatus as claimed in claim 19 , wherein in a cooling configuration, said heat exchange fluid comprises a coolant.

22. The apparatus as claimed in any of claims 19 , wherein in a heating configuration, said heat exchange fluid comprises a heated fluid.

23. The apparatus as claimed in claim 21 , wherein said coolant comprises seawater.

24. The apparatus as claimed in claim 1 , arranged subsea.

25. The apparatus as claimed in claim 1 , wherein said cooling is performed to cool said fluid to a temperature below a wax appearance temperature for said fluid.

26. The apparatus as claimed in claim 1 , arranged to supply said fluid from the outlet into a subsea pipeline connecting the apparatus to a downstream facility.

27. A method of processing fluid from a well using the apparatus as claimed in claim 1 , the method comprising:
a. providing the first heat exchanger which includes the first wall portion defining the first region, and the second heat exchanger which includes the second wall portion defining the second region, wherein the first heat exchanger and the second heat exchanger are disposed in a parallel configuration;
b. supplying said

Assignees

• Nes Hroar Andreas
• Hoffmann Rainer Josef
• Maraak Knut Arild
• Goplen Stig
• Statoil Petroleum As

Inventors

• Nes Hroar Andreas
• Hoffmann Rainer Josef
• Maråk Knut Arild
• Goplen Stig

Classifications

• F28G13/005

  cleaning by increasing the temperature of heat exchange surfaces (F28G7/005, F28G11/00 take precedence) · CPC title

• F28F2265/18

  for removing contaminants, e.g. for degassing · CPC title

• F28F19/00

  Preventing the formation of deposits or corrosion, e.g. by using filters {or scrapers} · CPC title

• F28D7/16

  the conduits being arranged in parallel spaced relation ({F28D7/0008 - F28D7/0058 take precedence}; F28D7/02 - F28D7/10 take precedence) · CPC title

• F28D7/10

  the conduits being arranged one within the other, e.g. concentrically {(multiple wall tubes for leak detection F28F1/003)} · CPC title