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WO1999020873A1 - Piege a sable - Google Patents

Piege a sable Download PDF

Info

Publication number
WO1999020873A1
WO1999020873A1 PCT/NO1998/000317 NO9800317W WO9920873A1 WO 1999020873 A1 WO1999020873 A1 WO 1999020873A1 NO 9800317 W NO9800317 W NO 9800317W WO 9920873 A1 WO9920873 A1 WO 9920873A1
Authority
WO
WIPO (PCT)
Prior art keywords
wellhead
tank
sump
valve
inlet pipe
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/NO1998/000317
Other languages
English (en)
Norwegian (no)
Inventor
Jan Magne Garnes
Gunnar Andersen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Equinor ASA
Original Assignee
Den Norske Stats Oljeselskap AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Den Norske Stats Oljeselskap AS filed Critical Den Norske Stats Oljeselskap AS
Priority to AU97669/98A priority Critical patent/AU9766998A/en
Publication of WO1999020873A1 publication Critical patent/WO1999020873A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/02—Settling tanks with single outlets for the separated liquid
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/34—Arrangements for separating materials produced by the well
    • E21B43/35—Arrangements for separating materials produced by the well specially adapted for separating solids

Definitions

  • This invention concerns a so-called sand trap, a device for separating particles from a fluid current, especially for separating sand from a wellstream in petroleum production, in a tank with an inlet and an outlet channel.
  • Oil bearing geological formation consisting loosely consolidated sandstones often bring much sand mixed up with the petroleum fluids produced by ⁇ oilwells in the formation.
  • Sand producing oilwells lead to erosion of surface equipment which may result in gas- or oil leaks, and may harm pumps and valves so they are worn or may fail .
  • the remedy to the problem of sand production is to reduce the fluid flow out of the well.
  • the Gullfaks field in the North Sea has, at the time of filing of the application, 39 wells producing at reduced rate due to sand production.
  • One way of separating out sand is to apply a so-called sand cyclone.
  • the applicant's own NO 176 451 describes a separate collecting tank for solid components and particles from an oil stream. This collection tank is arranged below a tank separating different liquids and gases from the wellstream. Vertical tubes connect the processing tank with the collecting tank.
  • the collecting tank may be emptied, or changed with an empty tank.
  • US-patent 5 295 537 describes a particle trap which shall be arranged in an oil producing well.
  • the oil stream is led over an inner standing cylinder-shaped edge and down through a perforated plate to a standing funnel .
  • An outlet pipe reaches almost down to the lower inner outlet of the funnel.
  • the oil passes up through the outlet pipe, while the particles fall down through the funnel to a closed compartment .
  • No other means for emptying the sand trap while full is devised, than pulling it out of the well and exchanging it .
  • the invention overcomes the disadvantages of the known art by devising a device for separation of particles from a fluid stream, especially for separating sand from a wellstream in petroleum production, in a tank with an inlet and an outlet .
  • the novel feature of the invention is primarily that the inlet has a mouth towards a relatively narrowed part of the tank, and that there is a spatial connection towards a relatively expanded part of the tank for precipitation of particles, with a sump arranged for the precipitated particles. Further features of the invention arises from the subordinate claims .
  • the advantages of the invention is that one may perform petroleum production from a sand-bearing reservoir with a considerably reduced amount of particles in the produced petroleum fluid. It will also be possible to have a permanent connection without the use of provisional flow pipes. Further, it is an advantage that the main effect of the erosion occurs controlled in an area near the top of the particle trap. An additional advantage is that the preferred embodiment extends mainly in the height and is not especially space demanding, and that all well maintenance may be done without complete dismantling of the particle trap.
  • Fig. 1 shows a vertical section of a principal embodiment of the invention.
  • Fig. 2 shows a vertical section of a preferred embodiment of the invention.
  • Fig. 3 shows a horizontal section through the plane A- A' of Fig. 2.
  • Fig. 4 is a perspective, partial section and partial view of the preferred embodiment of the invention.
  • Fig. 1 shows the main features of a principal embodiment of the invention, where oil is meant to flow into a tank 1 vertically upwards through an inlet pipe 2.
  • the inlet pipe has its mouth towards a relatively narrow area or space volume part 3a of the tank 1, and is led further, along the outer wall towards a relatively widened area or space volume part 3b where particles will precipitate to a sump 4 near the relatively expanded area or space volume part 3b.
  • the oil will pass out over a threshold 6 and leave the tank through an outlet 7.
  • the tank 1 is mainly of a vertical cylindrical shape with a convex top.
  • the top makes, in a preferred embodiment, a unit together with the inlet pipe 2, preferably being fixed to the upper edge of the cylindrical sidewall of the tank by means of a flange connection 14 as shown in Fig. 2. This gives access to the well from above by unlocking the top from the flange connection and then removing the top and the inlet pipe 2 with a corresponding skirt 2b simultaneously.
  • This solution makes logging, maintenance and all other well operations possible after arranging the particle trap 1 on the wellhead 10.
  • the inlet pipe 2 has a mouth pointing towards the wall in one side of the tank 1, preferably over a convexly arched surface which partly follows the convex shape of the top, and with the mouth pointing towards the side of the tank 1 towards the relatively narrow area 3a of the tank 1, and being closed on its lower side towards the outlet 7.
  • a bottom 5a of the tank 1 is in a preferred embodiment more shallow under the relatively narrow area or space volume part 3a, and the bottom 5a " is continuously inclined down towards and corresponding with a bottom 5b under the relatively expanded area or space volume part 3b of the tank 1.
  • a sump 4 constitutes in a preferred embodiment a unit in the bottom of the relatively expanded area or space volume part 3b, and has a device 4b for draining sedimented particles out of the swamp 4. This device may transfer the sedimented particle contents to an other tank or a pipe (not shown) for further treatment or separation of the particle- filled oil mud.
  • a valve 4c is arranged above the draining device 4b, which valve 4c is arranged to isolate the petroleum fluids with the sedimented particle contents in the sump 4 from the petroleum fluids in the separation tank while the sump 4 is emptied.
  • a valve 4d arranged at the bottom of the sump 4, the valve 4d is arranged for emptying the sump 4 to the sea or elsewhere.
  • the inlet pipe's 2 axis coincides, out of space considerations, generally with the axis of the tank 1.
  • the axis ⁇ of the inlet pipe may be parallel with the axis of the tank 1 and parallelly displaced with respect to that, towards the direction of the relatively restricted area or space volume part 3b.
  • such a solution is more demanding of space and will lay bonds on a potentially larger area around the wellhead if no special mounting azimuth direction on the wellhead is to be predetermined.
  • the spatial link between the relatively narrow area or space volume part 3a extends around the outer wall of the inlet pipe 2 to the relatively expanded or widened area or space volume part 3b.
  • This connection occurs in the preferred embodiment on both sides about the inlet pipe 2.
  • the spatial connection between 3a and 3b be in only one direction about the inlet pipe 2.
  • the mouth of the inlet pipe 2 is near the top of the tank 1.
  • An overflow or threshold 6 is arranged standing above the outlet channel 7.
  • the petroleum fluids must pass this way out after the possible sedimentation of particles has taken place in the expanded space volume part 3b of the sump 4.
  • the outlet channel 7 is limited outwards by the threshold 6 and the wellhead's 10 inner wall, and inwards by the outside of the inlet pipe's 2 outside, the inlet pipe having smaller diameter than the inner diameter of the wellhead 10.
  • Below the outlet channel 7 is limited by a skirt 2b which by means of a packer 2a is closed against the inside of the wellhead 10, and arranged downstream with respect to an outlet valve or wing valve 8 at the side of the wellhead 10.
  • the petroleum fluids usually a mix of oil, gas and water will due to this arrangement flow out of the wing valve above the skirt 2b in the same way as they do in the known art without the particle separator.
  • a kill-valve 12 is arranged at the same level of the wellhead as the wing valve 8. When a potential or existing too high pressure in the well is to be stopped, mud with high density is pumped in via the kill-valve 12 to the well, overcoming the overpressure in the well by means of the pressure from the heavy mud's hydrostatic column.
  • a master valve 13 This master valve closes off the whole wellhead towards the surroundings and is used while the particle trap is mounted on the wellhead.
  • the particle trap has under the bottom 5a, 5b an outside continuation of the standing threshold 6, also constituting a part of the outlet channel 7, continuing to the wellhead 10.
  • a flange 15 fitting the top flange 16 of the wellhead.
  • a swab valve 18 Over the master valve and the outlets to the kill- and wing valves 12, 8 there usually is arranged a swab valve 18. Before mounting the particle trap the swab valve 18 and the master valve 13 are closed, together with the wing valve 8.
  • the top of the wellhead over the top flange 16 is removed, before the inlet pipe 2 with the skirt 2b is guided down into the wellhead until the flanges 15 and 16 meet.
  • the master valve and the wing valve is reopened for through flow of the petroleum fluid.
  • the swab valve can not be operated when the particle trap is mounted, but Norwegian authorities' demand for two separate intact barriers is kept because the master valve 13 comprises the first barrier, and the particle trap together with the wing valve 8 and the kill valve 12 constitutes the other barrier.
  • the preferred embodiment is in a preferred embodiment designed for use on a so-called "platform well” but may with minor modifications be used on a wellhead at the seabed.
  • the particle trap may be arranged with additional construction features, e.g. with a detector or level gauge for sand particles in the sump 4, without departing significantly from the invention.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Cyclones (AREA)

Abstract

Dispositif permettant d'éliminer les particules d'un fluide, notamment d'éliminer le sable d'un flux de puits pour la production de pétrole, dans un réservoir comportant un tuyau d'entrée et un conduit de sortie. La caractéristique de l'invention est le fait que le tuyau d'entrée présente une bouche aboutissant à une partie relativement étroite du réservoir et reliée à une partie relativement large de ce dernier, de façon à précipiter les particules, et un puisard destiné aux particules précipitées.
PCT/NO1998/000317 1997-10-23 1998-10-22 Piege a sable Ceased WO1999020873A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU97669/98A AU9766998A (en) 1997-10-23 1998-10-22 Sand trap

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO974906 1997-10-23
NO974906A NO305348B1 (no) 1997-10-23 1997-10-23 Anordning for utskilling av partikler fra en fluidstr°m

Publications (1)

Publication Number Publication Date
WO1999020873A1 true WO1999020873A1 (fr) 1999-04-29

Family

ID=19901252

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO1998/000317 Ceased WO1999020873A1 (fr) 1997-10-23 1998-10-22 Piege a sable

Country Status (3)

Country Link
AU (1) AU9766998A (fr)
NO (1) NO305348B1 (fr)
WO (1) WO1999020873A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005079946A1 (fr) 2004-01-20 2005-09-01 M-I Epcon As Separation de petrole brut au niveau de la tete de puits
US7144503B2 (en) 2000-11-21 2006-12-05 M-I Epcon As Combined degassing and flotation tank
EP1779911A1 (fr) 2005-10-28 2007-05-02 M-I Epcon As Réservoir de séparation.
EP1782870A1 (fr) 2005-10-28 2007-05-09 M-I Epcon As Dispositif de séparation
US20130186622A1 (en) * 2009-01-09 2013-07-25 Grandbury Thompson Group, LLC Backflow collection system and method for reclaiming the same
EA033309B1 (ru) * 2017-04-13 2019-09-30 Научно-Исследовательский И Проектный Институт Нефти И Газа (Нипинг) Способ улавливания механических примесей в потоке пластовых флюидов

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4357244A (en) * 1978-09-25 1982-11-02 Chevron Research Company Method for removing suspended solids from a liquid
WO1995001215A1 (fr) * 1993-07-01 1995-01-12 Southern Water Services Ltd. Separateur de suspensions liquides
US5505860A (en) * 1994-10-24 1996-04-09 Sager; Robert J. Grease and oil trap
GB2293988A (en) * 1994-10-14 1996-04-17 Univ Bristol Sedimentation tanks

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4357244A (en) * 1978-09-25 1982-11-02 Chevron Research Company Method for removing suspended solids from a liquid
WO1995001215A1 (fr) * 1993-07-01 1995-01-12 Southern Water Services Ltd. Separateur de suspensions liquides
GB2293988A (en) * 1994-10-14 1996-04-17 Univ Bristol Sedimentation tanks
US5505860A (en) * 1994-10-24 1996-04-09 Sager; Robert J. Grease and oil trap

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8119000B2 (en) 2000-11-21 2012-02-21 Schlumberger Norge As Combined degassing and floatation tank
US7144503B2 (en) 2000-11-21 2006-12-05 M-I Epcon As Combined degassing and flotation tank
BG65013B1 (bg) * 2000-11-21 2006-12-29 Epcon Norge As Комбиниран обезгазяващ и флотационен резервоар
US8440077B2 (en) 2000-11-21 2013-05-14 Schlumberger Norge As Combined degassing and flotation tank
US7534354B2 (en) 2000-11-21 2009-05-19 M-I Epcon As Combined degassing and flotation tank
WO2005079946A1 (fr) 2004-01-20 2005-09-01 M-I Epcon As Separation de petrole brut au niveau de la tete de puits
EP1779911A1 (fr) 2005-10-28 2007-05-02 M-I Epcon As Réservoir de séparation.
US8110024B2 (en) 2005-10-28 2012-02-07 Schlumberger Norge As Separator tank for separation of fluid comprising water, oil and gas,use of such a tank, and method for separating a fluid including water, oil, and gas
US8105421B2 (en) 2005-10-28 2012-01-31 Schlumberger Norge As Well fluid separator tank for separation of fluid comprising water, oil and gas, use of such a tank, and a method for separating a well fluid including water, oil, and gas
EP1782870A1 (fr) 2005-10-28 2007-05-09 M-I Epcon As Dispositif de séparation
US20130186622A1 (en) * 2009-01-09 2013-07-25 Grandbury Thompson Group, LLC Backflow collection system and method for reclaiming the same
US9597614B2 (en) * 2009-01-09 2017-03-21 Granbury Thompson Group, Llc Backflow collection system and method for reclaiming the same
US9687761B2 (en) 2009-01-09 2017-06-27 Granbury Thompson Group, Llc Backflow collection system and method for reclaiming the same
EA033309B1 (ru) * 2017-04-13 2019-09-30 Научно-Исследовательский И Проектный Институт Нефти И Газа (Нипинг) Способ улавливания механических примесей в потоке пластовых флюидов

Also Published As

Publication number Publication date
AU9766998A (en) 1999-05-10
NO974906D0 (no) 1997-10-23
NO305348B1 (no) 1999-05-18

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