Cyclone inlet flow diverter for separator vessels

• US 4,778,494 A
• Filed: 07/29/1987
• Issued: 10/18/1988
• Est. Priority Date: 07/29/1987
• Status: Expired due to Fees

• Current Assignee: Atlantic Richfield Company (BP PLC)
• Original Assignee: Atlantic Richfield Company (BP PLC)
• Inventors: Patterson, John C.
• Primary Examiner(s): Spitzer, Robert
• Application Number:
  US07/079,301
• Time in Patent Office: 447 Days
• Field of Search: 55/174, 55/176, 55/177, 55/184, 55/191, 55/204, 55/416, 55/424, 55/459 R
• US Class Current: 96/183
• CPC Class Codes: B01D 19/0057 the centrifugal movement being caused by a vortex, e.g. using a cyclone, or by a tangential inlet
• CPC Class Codes: B01D 45/12 by centrifugal forces centrifuges B04B; cyclones B04C
• CPC Class Codes: B04C 5/10 with perforated walls
• CPC Class Codes: B04C 7/00 Apparatus not provided for in group B04C1/00, B04C3/00, or B04C5/00; Multiple arrangements not provided for in one of the groups B04C1/00, B04C3/00, or B04C5/00; Combinations of apparatus covered by two or more of the groups B04C1/00, B04C3/00, or B04C5/00
• CPC Class Codes: B04C 9/00 Combinations with other devices, e.g. fans, expansion chambers, diffusors, water lockswith filters B01D50/00

Abstract

A gas-liquid separator or slug catcher includes an inlet flow diverter for disposition in a separator vessel wherein the flow diverter includes a generally cylindrical inner wall member and a cylindrical cap having a depending wall spaced from and surrounding the inner wall member. The cap includes a transverse top wall which is spaced from the top edge of the inner wall to provide an overflow path for surges of liquid and/or gas. An inlet conduit extends to a tangential opening formed in the inner wall member for introducing fluid into an interior chamber. The inner wall member includes a transverse bottomplate which is provided with a series of openings around its periphery. Slugs of gas and two-phase liquid flow in a vortical manner in the diverter chamber whereby the gas is separated from the liquid mixture and some de-emulsification of liquid is accomplished through centrifugal forces. Deswirled liquid exits the apparatus through a bottomplate under the gas-liquid interface in the separator vessel. In an alternate embodiment of the apparatus, a series of circumferentially and longitudinally spaced perforations are formed in the inner wall member and the depending wall of the cap member.

Claims

1. A system for separating gas from liquid under relatively widely varying flow rates of gas and liquid such as in the production of crude oil from subterranean wells, said system including in combination, a separator vessel including means for retaining a quantity of separated liquid at a normal liquid level in said separtor vessel above which is formed a gas collection space and means forming outlet conduits for said gas and said liquid, respectively, and inlet flow diverter apparatus disposed in said vessel and comprising:

a generally cylindrical, substantially vertically extending inner wall member defining an interior chamber, said inner wall member depending below said normal liquid level;

a fluid inlet conduit opening through said inner wall member into said chamber for discharging fluid comprising a gas-liquid mixture including slugs of gas and liquid at varying flow rates into said chamber;

a generally cylindrical cap member including a peripheral depending wall spaced from and surrounding said inner wall member and defining with said inner wall member a liquid overflow space for receiving liquid overflow from said chamber, said cap member including means defining a gas outlet opening for discharging gas from said chamber into said gas collection space of said vessel and said depending wall includes a bottom edge delimiting said liquid overflow space and disposed below said normal liquid level for discharging liquid overflow from said chamber to said quantity of liquid in said separator vessel;

means for supporting said cap member relative to said inner wall member; and

means forming an opening into said chamber disposed below said normal liquid level for discharging liquid separated from said gas in said chamber into said quantity of separated liquid in said separator vessel.

2. The apparatus set forth in claim 1 wherein:

said inlet conduit includes a transition part for forming a generally rectangular inlet opening into said chamber and for dischraging fluid into said chamber substantially tangentially along an interior wall surface of said inner wall member.

3. The apparatus set forth in claim 1 wherein:

said means forming an opening for discharging liquid from said chamber comprises a transverse bottom plate and a plurality of openings formed in said bottom plate disposed substantially around the periphery of said bottom plate.

4. The apparatus set forth in claim 3 including:

a plurality of deswirl vanes extending transversely with respect to said inner wall member and below said bottom plate.

5. The apparatus set forth in claim 1 including:

a plurality of radially and longitudinally extending deswirl vanes spaced apart circumferentially around said inner wall member and extending between said inner wall member and said depending wall of said cap member.

6. The apparatus set forth in claim 1 wherein:

said cap member includes a generally transverse end wall defining a liquid overflow space between said end wall and a top edge of said inner wall member.

7. The apparatus set forth in claim 6 wherein:

said end wall depends into and delimits said chamber and said end wall includes means forming said gas outlet opening.

8. The apparatus set forth in claim 1 wherein:

said inner wall member includes a plurality of perforations extending peripherally and longitudinally in said inner wall member.

9. The apparatus set forth in claim 8 wherein:

said depending wall of said cap member includes a plurality of circumferentially and longitudinally spaced perforations formed therein and substantially below the normal liquid level in said vessel.

10. A system for separating gas from liquid under relatively widely varying flow rates of gas and liquid such as in the production of crude oil from subterranean wells, said system including in combination, a separator vessel including means for retaining a quantity of separated liquid at a normal liquid level in said separator vessel above which is formed a gas collection space and means forming outlet conduits for said gas and said liquid, respectively, and inlet flow diverter apparatus disposed in said vessel and comprising:

a generally cylindrical, substantially vertically extending inner wall member defining an interior chamber and depending below said normal liquid level;

a fluid inlet conduit including a transition part forming a generally rectangular inlet opening into said chamber for discharging fluid comprising a gas-liquid mixture including slugs of gas and liquid at varying flow rates into said chamber along an interior wall surface of said inner wall member;

a generally cylindrical cap member including a peripheral depending wall spaced from and surrounding said inner wall member and defining with said inner wall member a liquid overflow space for receiving liquid overflow from said chamber, said cap member including means defining a gas outlet opening for discharging gas from said chamber into said gas collection space of said vessel and said depending wall includes a bottom edge delimiting said liquid overflow space and disposed below said normal liquid level for discharging liquid overflow from said chamber to said quantity of liquid in said separator vessel;

a plurality of radially and longitudinally extending deswirl vanes spaced apart circumferentially around said inner wall member and extending between said inner wall member and said cap member; and

means forming an opening into said chamber disposed below said normal liquid level for discharging liquid separated from said gas in said chamber into said quantity of separated liquid in said separator vessel comprising a transverse bottom plate and a plurality of openings formed in said bottom plate disposed substantially around the periphery of said bottom plate.