WO1987001759A1 - Collecteur de bouchon pouvant etre nettoye - Google Patents

Collecteur de bouchon pouvant etre nettoye Download PDF

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Publication number
WO1987001759A1
WO1987001759A1 PCT/NO1986/000065 NO8600065W WO8701759A1 WO 1987001759 A1 WO1987001759 A1 WO 1987001759A1 NO 8600065 W NO8600065 W NO 8600065W WO 8701759 A1 WO8701759 A1 WO 8701759A1
Authority
WO
WIPO (PCT)
Prior art keywords
slug
catcher
riser
pipeline
liquid
Prior art date
Application number
PCT/NO1986/000065
Other languages
English (en)
Inventor
Harald Are Asheim
Original Assignee
Stiftelsen For Industriell Og Teknisk Forskning Ve
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 Stiftelsen For Industriell Og Teknisk Forskning Ve filed Critical Stiftelsen For Industriell Og Teknisk Forskning Ve
Priority to DE8686905447T priority Critical patent/DE3663054D1/de
Priority to AT86905447T priority patent/ATE42602T1/de
Publication of WO1987001759A1 publication Critical patent/WO1987001759A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D3/00—Arrangements for supervising or controlling working operations
    • F17D3/14—Arrangements for supervising or controlling working operations for eliminating water
    • 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

Definitions

  • the invention concerns a slug-catcher of the type described in the introduction to patent clai 1.
  • a slug is an accumulation of liquid which blocks the cross-section of a pipeline that is mainly filled with gas. Slugs are propelled by the difference in gas pressure at the two edges. Given specific conditions, slugs can contain a large amount of liquid and/or reach high velocities.
  • Slug-catchers have been developed to prevent slugs entering intake units such as processing plants. These devices are designed to divide the liquid and the gas so that only the gas is permitted to enter the intake unit directly. In addition, the slug has to be retarded to prevent a liquid impact which can cause mechanical stress. A further consideration is that it is desirable to maintain a constant flow of gas into the intake unit.
  • Slug-catchers are known which are based on the so-called "finger priniciple" where gas and liquid are divided by directing them into a number of parallel branch pipes.
  • This type of device requires a great deal of space and is unsatisfactory for subsea operations.
  • Another difficulty is that it is impossible to clean the unit using pigs, i.e. bodies which are led along a pipe.
  • a second type of slug-catcher exists, this is based on separation in a tank where the capacity of the tank is dimensioned so as to accomodate the largest slug volume that can be expected. Though this type of slug-catcher requires less space than the first type, regulating the liquid level is an extremely demanding task.
  • slug-catchers takes the form of relief piping, i.e. an extra loop of pipe. These are frequently used with pigs and assume that incoming slugs are led into the relief pipe by means of a valve.
  • the main object of the invention is to provide a slug-catcher that functions satisfactorily under water, too and that can be installed under water using normal pipe-laying techniques.
  • a specific object is providing a slug-catcher which can be mounted on the seabed in connection with an intake unit placed above the water, such as on a platform. Such a slug-catcher should have no moveable parts under water, as well as being reliable and easy to maintain.
  • the invention can be realized by designing the slug-catcher in accordance with the characterizing part of patent claim 1.
  • a slug-catcher is constructed in a straight - orward manner and can be situated on the seabed and connected to a pipeline from the platform or well. Increasing the size to accomodate large slugs is not problematic and maintenance can be done easily.
  • the slug-catcher according to this invention can be pigged, i.e. cleaned by a pig.
  • the slug-catcher according to the invention operates as follows:
  • Fig. 1 shows a schematic perspective view of an offshore platform which is linked to a slug-catcher designed in accordance with the invention whilst fig. 2 is a side view showing the principle of the slug-catcher designed in accordance with the invention.
  • a platform 11 is located in an offshore area with a foundation on the seabed.
  • the main pipeline 12 from a remote platform or wellhead (not illustrated) is designed to carry gas to an intake unit on the platform.
  • the riser 14, which will be called the secondary riser, could for instance have a cross-section which is only 1/4 of that of the main pipeline.
  • the main pipeline 12 continues from the junction 13 to a pipe loop 15 on the seabed.
  • the pipe loop 15 ensures that there is enough volume to gather liquid from a slug.
  • This loop 15 continues into a riser 16 at the foundations of the platform.
  • This riser 16 which henceforth is referred to as the main riser is led up to the intake unit on the platform.
  • Fig. 2 is a schematic presentation of the design of the intake unit on the platform 11.
  • the two risers, 14 and 16, are led into a separation tank 17.
  • the separation tank has a liquid drainage tube 18, the drainage being controlled by a valve 19.
  • At the top edge of the separation tank 17 there is an outlet pipe 20 for gas.
  • the pressure in the separation tank 17 is maintained by a valve 21 to regulate pressure in the outlet pipe 20.
  • the main pipe loop 15 can be emptied of any liquid accumulations by regulating the throttle valve 22 so that there will be enough pressure to drive the liquid up along the main riser 16 into the separation tank 17.
  • the throttle valve 22 can be regulated so that the pressure it creates compensates for the loss of pressure due to friction in the pipe loop 15 and the main riser 16. This means that the loop 15 will be self-emptying.
  • a float in the separation tank 17 controls the opening of the valve 19 so that a reasonably constant liquid level is retained in the tank 17.
  • the length of the pipe loop 15 is selected so that apart from accomodating the dimensions of the slugs, sufficient retardation of the said is achieved when pressure is equalized.
  • the height of the risers 14, 16 is determined by the hegiht of the platform above the seabed. A height of 150 m will be adequate with almost all conceivable slug sizes. Should this height not be enough, the counter-pressure to limit the entry of liquid in the secondary riser 14 can be increased by adjusting the throttle valve 22.

Landscapes

  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Earth Drilling (AREA)
  • Pipeline Systems (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

Dispositif permettant de collecter des bouchons de liquide dans un pipe-line transportant du gaz (collecteurs de bouchons), notamment dans le contexte de l'exploitation de gisements pétroliers et gazeux offshore. Le pipe-line mène le long du front marin à une unité d'admission au-dessus de l'eau, en général une plate-forme. Le pipe-line est également relié à une seconde colonne montante (14) qui présente une section inférieure à celle du pipe-line principal (12). Ce dernier aboutit à une boucle (15) le long du front marin à partir de la jonction de sorte que la longueur est suffisante pour loger un bouchon et le retarder. La colonne montante (14) est équipée d'un étrangleur de régulation (22) qui peut fournir une contre-pression pour vider le liquide dans le pipe-line principal.
PCT/NO1986/000065 1985-09-18 1986-09-17 Collecteur de bouchon pouvant etre nettoye WO1987001759A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE8686905447T DE3663054D1 (en) 1985-09-18 1986-09-17 Slug-catcher that can be pigged
AT86905447T ATE42602T1 (de) 1985-09-18 1986-09-17 Durch einen molch reinigbarer auffaenger fuer fluessigkeitspfropfen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO853656A NO157467C (no) 1985-09-18 1985-09-18 Anordning for oppsamling av vaeskeplugger i en gassfoerende roerledning.
NO853656 1985-09-18

Publications (1)

Publication Number Publication Date
WO1987001759A1 true WO1987001759A1 (fr) 1987-03-26

Family

ID=19888485

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO1986/000065 WO1987001759A1 (fr) 1985-09-18 1986-09-17 Collecteur de bouchon pouvant etre nettoye

Country Status (4)

Country Link
EP (1) EP0238535B1 (fr)
DE (1) DE3663054D1 (fr)
NO (1) NO157467C (fr)
WO (1) WO1987001759A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988006674A1 (fr) * 1987-03-05 1988-09-07 Den Norske Stats Oljeselskap A.S Dispositif destine a un systeme de liberation de pression pour equipement de production sur des plates-formes de forage en mer
EP0331295A1 (fr) * 1988-02-03 1989-09-06 Norsk Hydro A/S Assemblage de pipelines pour séparer au moins un courant diphasique
US5232475A (en) * 1992-08-24 1993-08-03 Ohio University Slug flow eliminator and separator
US5507858A (en) * 1994-09-26 1996-04-16 Ohio University Liquid/gas separator and slug flow eliminator and process for use
GB2358205A (en) * 2000-01-17 2001-07-18 Bg Intellectual Pty Ltd Method and apparatus for eliminating severe slugging in a riser of a pipeline includes measuring pipeline pressure and operating a valve
WO2001053649A2 (fr) * 2000-01-17 2001-07-26 Lattice Intellectual Property Ltd Prevention de la formation de bouchons
WO2003067146A1 (fr) * 2002-02-04 2003-08-14 Statoil Asa Canalisation multiphase sous-marine
WO2007034142A1 (fr) * 2005-09-19 2007-03-29 Bp Exploration Operating Company Limited Dispositif destiné à réguler la formation de bouchons
WO2008140319A1 (fr) * 2007-05-16 2008-11-20 Statoilhydro Asa Procédé de régulation de liquide dans des canalisations de fluide multi-phases

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3705626A (en) * 1970-11-19 1972-12-12 Mobil Oil Corp Oil well flow control method
DE2253116A1 (de) * 1971-10-29 1973-05-03 Erap Vorrichtung zum trennen von rohprodukten, die aus produktionssonden fliessen, am boden eines erdoelfeldes im meer
US4160652A (en) * 1977-08-26 1979-07-10 Texas Eastern Engineering, Ltd. Method and apparatus for handling the fluids in a two-phase flow pipeline system
US4519815A (en) * 1983-12-15 1985-05-28 Texas Eastern Engineering Ltd. Slug-catching method and apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3705626A (en) * 1970-11-19 1972-12-12 Mobil Oil Corp Oil well flow control method
DE2253116A1 (de) * 1971-10-29 1973-05-03 Erap Vorrichtung zum trennen von rohprodukten, die aus produktionssonden fliessen, am boden eines erdoelfeldes im meer
US4160652A (en) * 1977-08-26 1979-07-10 Texas Eastern Engineering, Ltd. Method and apparatus for handling the fluids in a two-phase flow pipeline system
US4519815A (en) * 1983-12-15 1985-05-28 Texas Eastern Engineering Ltd. Slug-catching method and apparatus

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Harry Whitehead: An A-Z of Offshore Oil & Gas P. 257 *
Oil & Gas Journal 27.4, 1981, p. 143-148 *

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988006674A1 (fr) * 1987-03-05 1988-09-07 Den Norske Stats Oljeselskap A.S Dispositif destine a un systeme de liberation de pression pour equipement de production sur des plates-formes de forage en mer
GB2209781A (en) * 1987-03-05 1989-05-24 Norske Stats Oljeselskap Device for a pressure-relief system for processing equipment on offshore platforms
EP0331295A1 (fr) * 1988-02-03 1989-09-06 Norsk Hydro A/S Assemblage de pipelines pour séparer au moins un courant diphasique
US5232475A (en) * 1992-08-24 1993-08-03 Ohio University Slug flow eliminator and separator
EP0585096A1 (fr) * 1992-08-24 1994-03-02 The Board Of Trustees Of The University Of Illinois Dispositif d'élimination et de séparation de dépôts dans un courant
US5507858A (en) * 1994-09-26 1996-04-16 Ohio University Liquid/gas separator and slug flow eliminator and process for use
WO2001053649A3 (fr) * 2000-01-17 2002-04-04 Lattice Intellectual Property Prevention de la formation de bouchons
WO2001053649A2 (fr) * 2000-01-17 2001-07-26 Lattice Intellectual Property Ltd Prevention de la formation de bouchons
GB2358205A (en) * 2000-01-17 2001-07-18 Bg Intellectual Pty Ltd Method and apparatus for eliminating severe slugging in a riser of a pipeline includes measuring pipeline pressure and operating a valve
GB2358205B (en) * 2000-01-17 2003-12-31 Bg Intellectual Pty Ltd Slugging control
US6716268B2 (en) 2000-01-17 2004-04-06 Lattice Intellectual Property Ltd. Slugging control
WO2003067146A1 (fr) * 2002-02-04 2003-08-14 Statoil Asa Canalisation multiphase sous-marine
WO2007034142A1 (fr) * 2005-09-19 2007-03-29 Bp Exploration Operating Company Limited Dispositif destiné à réguler la formation de bouchons
EA012384B1 (ru) * 2005-09-19 2009-10-30 Бп Эксплорейшн Оперейтинг Компани Лимитед Устройство регулирования перемежающегося потока
US8393398B2 (en) 2005-09-19 2013-03-12 Bp Exploration Operating Company Limited Device for controlling slugging
WO2008140319A1 (fr) * 2007-05-16 2008-11-20 Statoilhydro Asa Procédé de régulation de liquide dans des canalisations de fluide multi-phases
US8453747B2 (en) 2007-05-16 2013-06-04 Statoilhydro Asa Method for liquid control in multiphase fluid pipelines
EA018454B1 (ru) * 2007-05-16 2013-08-30 Статойл Аса Способ управления жидкостью в трубопроводах многофазной текучей среды

Also Published As

Publication number Publication date
EP0238535B1 (fr) 1989-04-26
DE3663054D1 (en) 1989-06-01
NO853656L (no) 1987-03-19
NO157467B (no) 1987-12-14
NO157467C (no) 1988-03-23
EP0238535A1 (fr) 1987-09-30

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