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WO1998031479A1 - Dispositif realise au moyen d'un racleur - Google Patents

Dispositif realise au moyen d'un racleur Download PDF

Info

Publication number
WO1998031479A1
WO1998031479A1 PCT/NO1998/000017 NO9800017W WO9831479A1 WO 1998031479 A1 WO1998031479 A1 WO 1998031479A1 NO 9800017 W NO9800017 W NO 9800017W WO 9831479 A1 WO9831479 A1 WO 9831479A1
Authority
WO
WIPO (PCT)
Prior art keywords
plug
pipe
pressure difference
diaphragm
core
Prior art date
Application number
PCT/NO1998/000017
Other languages
English (en)
Inventor
Ole Molaug
Odd Skjaeveland
Original Assignee
Akva Process 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 Akva Process As filed Critical Akva Process As
Priority to AU57825/98A priority Critical patent/AU5782598A/en
Publication of WO1998031479A1 publication Critical patent/WO1998031479A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/26—Pigs or moles, i.e. devices movable in a pipe or conduit with or without self-contained propulsion means
    • F16L55/28—Constructional aspects
    • F16L55/30—Constructional aspects of the propulsion means, e.g. towed by cables
    • F16L55/38—Constructional aspects of the propulsion means, e.g. towed by cables driven by fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
    • B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
    • B08B9/027—Cleaning the internal surfaces; Removal of blockages
    • B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
    • B08B9/053—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction
    • B08B9/055—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction the cleaning devices conforming to, or being conformable to, substantially the same cross-section of the pipes, e.g. pigs or moles
    • B08B9/0551—Control mechanisms therefor

Definitions

  • the invention relates to a device by a plug of the type which is driven through a pipeline by flowing fluid, for example hydrocarbons, normally with the purpose of cleaning the pipe- line internally, or for the inspection of the pipeline by means of instruments carried by the plug.
  • fluid for example hydrocarbons
  • Such a plug which is terminologically called a pig, is provided with seals which slidingly seal outwards against the wall of the pipe, and which is driven forward by pressurized fluid applied behind the plug.
  • the pressurized fluid may be gas flowing from a gas field to a receiving station several kilometres away. A plug is locked into the flowing fluid and is driven forward by the latter, and a plug may thus be sent through the pipeline without interrupting the fluid flow sig- nificantly.
  • Said seals may be formed as a disc, but more commonly the seals are formed as a cup with the bottom facing the direction of travel and the opening facing backwards, so that the driving pressurized fluid assists in pressing the seal out- wards against the wall of the pipe. It has been a problem that such seals reverse themselves, i.e. they adopt a cup- shape with the opening in the direction of travel. A reversed seal seals very poorly and the plug looses its propulsion. In order to avoid this, plugs are used, in which seals are attached to a core having a relatively large diameter, for example a core of metal, so that it is only the outer part of the seal which is subjected to pressure from the flowing fluid. Thereby a relatively rigid seal which can resist reversing, is achieved. At the same time the seal is restricted to working within a narrow range of diameters.
  • risers By floating production plants which supply hydrocarbons to a subsea pipeline, risers are used between the pipeline and production plant. Risers must be flexible like hoses to absorb the movement of the waves. Flexible risers which can resist the pressures in question, may only be produced in limited internal diameters, typically between three and four hundred millimetres, while a subsea pipeline may have a diameter which is two or three times larger.
  • a plug which, in contrast to known plugs, may work in both a riser and a pipeline of a substantially larger diameter.
  • the object of the invention is to provide a plug which may be supplied to a pipeline through a pipe or hose which has a substantially smaller internal diameter than that of the pipeline. It is also an object to provide a plug in which the risk of seals reversing has been substantially reduced.
  • a plug according to the invention comprises, in a manner known in itself, a seal element which exploits a pressure difference across the plug to provide power for propulsion of the plug.
  • a plug according to the invention further comprises a load which provides a force that the propulsive force should overcome, and the load is preferably arranged behind the seal relative to the direction of travel, so that it is pulled forward by the force from the pressure difference across the seal.
  • the load may be a friction unit providing a braking effect through gliding friction against the wall of the pipe.
  • the load may also be a unit on wheels, in which the wheels are provided with brakes.
  • the load may also be a unit on wheels, in which the wheels have an electric power genera- tor arranged thereto.
  • the pressure difference across the seal may be adjusted.
  • the load as a function of propulsive force, a constant or nearly constant load on the seal may be achieved. If the load on the seal increases, so that there is a risk that the seal will reverse itself, this may be avoided by reducing the load, whereby the load on the seal will be reduced.
  • Fig. 1 is a side-view, partly in section, of a plug within a pipe of relatively small diameter
  • Fig. 2 shows the plug within a pipe of larger diameter.
  • the reference numeral 1 defines a plug within a pipe 2 or a hose of a relatively small diameter.
  • the plug 1 comprises an elongated tubular core 3, which in its front end, relative to the direction of travel, is provided with an end piece 4 to which are rotable attached backwards pointing ribs 5.
  • the ribs 5 may be folded inwards against the core 3, so that they rest along the core 3 , and they may be turned outwards until pointing more at an angle, radially outwards and backwards from the front end of the core 3.
  • a mainly cone-shaped diaphragm 6 which together with the ribs 5 form an umbrella-like seal, the diaphragm 6 fitting tightly around the end piece 4, and the diaphragm 6 being arranged so that it may rest against the wall of the pipe 2 at the free end of the ribs.
  • the diaphragm 6 may with advantage be made of polyurethane or other durable synthetic material.
  • a link 8 which is pivotally attached by its ends to the slide 7 and the rib 5, respectively.
  • the ribs 5 may be brought from the folded position, in which the ribs 5 mainly rest along the core 3, into an unfolded position, in which the ribs 5 point more radially outwards from the core 3 and stretch the diaphragm 6, as is known in itself from an umbrella.
  • a set of brake shoes 9, typically three or more, is distributed around the core 3 and arranged so that they may rest against the wall of the pipe 2 , each brake shoe 9 being pivotally linked to the first slide 7, preferably by two arms 10 which in a known manner form a parallel guiding for the brake shoe 9, and in which each brake shoe 9 further is pivotally connected to a second slide 11 which is arranged so that it may be displaced along the core 3 by means of a manoeuvring arm 12.
  • the brake shoes 9 are located between the first slide 7 and the second slide 11.
  • An end piece 14 at the rear end of the core 3 may contain known electronic equipment for communication and other things.
  • the one end of a first spring 15, which is arranged inside the core 3 is attached at the front end of the core 3 , for example by means of a first transverse pin 16 which is arranged to the core 3 or the end piece 4.
  • the other end of the spring 15 is arranged to the second slide 11 by means of a second transverse pin 17 arranged to run in a longitudinally extending groove 18 in the wall of the core 3.
  • the spring 15 is pretensioned, so that the spring force seeks to push the second slide 11 forwards along the core.
  • the manoeuvring arm 12 will push the brake shoes 9, the parallel arms 10 and the first slide 7 forwards along the core 3, so that the links 8 turn the ribs 5 outwards and stretch the diaphragm 6.
  • the spring force will further cause the brake shoes 9 to be moved into abutment in the pipe 2.
  • the stop 13 is adjusted so that the diameter of the larger circumferential circle of the brake shoes 9 is slightly larger than the diameter of the largest pipe in which the plug 1 is to be used.
  • the plug In fig. 2 the plug is shown inside a pipeline 19 of substantially larger diameter than that of the pipe 2.
  • the fric- tional force between the brake shoes 9 and the pipeline 19 ensures that a pressure difference is created across the diaphragm 6, so that the diaphragm 6 is stretched and becomes capable of cleaning the pipeline of deposits, condensate or other things without collapsing.
  • the ribs 5 adopt a curved shape, as shown in Fig. 2. If the pressure difference across the diaphragm 6 increases, the curvature of the diaphragms 5 increases, and the links 8 pull the first slide 7 forwards.
  • the second slide 11 rests against the stop 13, and increased pressure difference across the diaphragm 6 therefore causes the distance between the slides 7, 11 to increase, and the contact force of the brake shoes against the pipeline 19 is reduced. Thereby the plug 1 will slide more easily and the pressure difference across the diaphragm will decrease.
  • the maximum contact force of the brake shoes 9, as decided by the spring 15, should be maintained until the pressure difference reaches a minimum value.
  • the pressure difference, at which the brake force shall be released, is decided by the force of a second spring 20 working against the first slide 7 and rearwards when the slide 7 is in the front position.
  • the brake force will be released only when the pressure difference across the diaphragm 6 becomes great enough to displace the first slide 7 forwards against the force of the second spring 20.
  • the spring force from the second spring 20 may be adjusted by an adjustable stop 21 which the spring 20 rests against.
  • the brake shoes 9 may be replaced by wheels provided with braking, or which have an electric power gen- erator arranged thereto for the production of electric power to electronic equipment carried by the plug 1.
  • the braking effect may be adjusted by adjusting the energy output from the power generator.
  • a plug 1 in accordance with the invention that the diaphragm 6 does not have to fit tightly outwards against the wall of the pipeline 19.
  • the lager diameter of the diaphragm 6 may be limited, so that there is a clearance between the diaphragm 6 and the pipeline 19. Then a fluid flow past the diaphragm 6 will be created, and the speed of the plug 1 will be somewhat lower than the fluid flow rate.
  • the brake shoes 9 ensures a predetermined pressure difference across the diaphragm 6.
  • the brake shoes 9 and manoeuvring arms will be close to the core 3 and cover a large part of the pipe cross section and provide propulsion independently of the diaphragm 6.
  • a secondary diaphragm not shown, may be provided, which is carried by the manoeuvring arms 12 to provide drive in an emergency, in which the diaphragm 6 is destroyed or otherwise out of operation.
  • To the second slide 11 may be arranged a not shown line, pulled along by the plug 1.
  • the plug may be pulled back by means of the line, whereby the line force will make the ribs 5 and the brake shoes 9 fold inwards against the core 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Braking Arrangements (AREA)

Abstract

La présente invention concerne un bouchon (1) agencé pour être entraîné dans un pipeline (19) sous l'action d'un fluide s'écoulant. Ce bouchon est pourvu d'un organe de fermeture étanche qui provoque la création d'une différence de pression de part et d'autre du bouchon, ce qui génère une force d'entraînement permettant de faire progresser le bouchon (1). Ce bouchon (1) est pourvu d'une charge que la force d'entraînement doit vaincre. Cette charge est réglée en fonction de la différence de pression de façon que la charge diminue dès que la différence de pression vient à dépasser une valeur définie.
PCT/NO1998/000017 1997-01-21 1998-01-20 Dispositif realise au moyen d'un racleur WO1998031479A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU57825/98A AU5782598A (en) 1997-01-21 1998-01-20 Device by a pig

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO970253 1997-01-21
NO970253A NO304357B1 (no) 1997-01-21 1997-01-21 Anordning ved en plugg

Publications (1)

Publication Number Publication Date
WO1998031479A1 true WO1998031479A1 (fr) 1998-07-23

Family

ID=19900285

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO1998/000017 WO1998031479A1 (fr) 1997-01-21 1998-01-20 Dispositif realise au moyen d'un racleur

Country Status (3)

Country Link
AU (1) AU5782598A (fr)
NO (1) NO304357B1 (fr)
WO (1) WO1998031479A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000053969A1 (fr) * 1999-03-05 2000-09-14 Willschuetz Klaus Dieter Dispositif auxiliaire de reparation d'un pipeline
AU740258B2 (en) * 1999-09-28 2001-11-01 Petroleo Brasileiro S.A. - Petrobras Remote-controlled vehicle for operations inside pipelines
EP1046856A3 (fr) * 1999-04-23 2002-04-03 PII Pipetronix GmbH Appareil pour déplacer un furet dans une conduite et dispositif d'étanchéité pour un tel appareil
WO2008039075A1 (fr) * 2006-09-28 2008-04-03 Sub Aqua Technology As Dispositif pour racleur
WO2014062077A1 (fr) * 2012-10-18 2014-04-24 Siemens Aktiengesellschaft Racleur pour nettoyer et/ou inspecter une canalisation, et procédé pour le fonctionnement d'un tel racleur
CN105507421A (zh) * 2016-02-04 2016-04-20 冯振鹏 一种下水道清理机器人
CN105544720A (zh) * 2016-02-04 2016-05-04 冯振鹏 一种下水道排沙清理机器人
CN110206961A (zh) * 2019-07-08 2019-09-06 中北大学 一种管道机器人内封堵系统
CN112157079A (zh) * 2020-09-26 2021-01-01 宜宾学院 一种清管器滚轮式冲击抑制器
CN112495955A (zh) * 2020-12-06 2021-03-16 华能江阴燃机热电有限责任公司 一种可变径管道清理装置
CN116291265A (zh) * 2023-05-24 2023-06-23 陕西华山建设集团有限公司 一种水井井壁清理装置及使用方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1132691A (en) * 1913-11-24 1915-03-23 L E Wyne Sewer-cleaner.
US2418880A (en) * 1944-01-25 1947-04-15 Standard Oil Dev Co Device for cleaning pipe lines
US3107379A (en) * 1959-08-20 1963-10-22 Service Pipe Line Company Pipeline cleaner propelling cup
US3703947A (en) * 1971-03-08 1972-11-28 Int Pipeline Services Inc Internal pipeline coating apparatus
NO146577B (no) * 1973-11-05 1982-07-19 Exxon Production Research Co Roerledningsplugg
US4941511A (en) * 1986-07-09 1990-07-17 Den Norske Stats Oljeselskap A.S Device with a valve function

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1132691A (en) * 1913-11-24 1915-03-23 L E Wyne Sewer-cleaner.
US2418880A (en) * 1944-01-25 1947-04-15 Standard Oil Dev Co Device for cleaning pipe lines
US3107379A (en) * 1959-08-20 1963-10-22 Service Pipe Line Company Pipeline cleaner propelling cup
US3703947A (en) * 1971-03-08 1972-11-28 Int Pipeline Services Inc Internal pipeline coating apparatus
NO146577B (no) * 1973-11-05 1982-07-19 Exxon Production Research Co Roerledningsplugg
US4941511A (en) * 1986-07-09 1990-07-17 Den Norske Stats Oljeselskap A.S Device with a valve function

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DERWENT'S ABSTRACT, No. 88-226283/32, week 8832; & SU,A,1 368 053 (ARKHIPOV A P) 23 January 1988. *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000053969A1 (fr) * 1999-03-05 2000-09-14 Willschuetz Klaus Dieter Dispositif auxiliaire de reparation d'un pipeline
EP1046856A3 (fr) * 1999-04-23 2002-04-03 PII Pipetronix GmbH Appareil pour déplacer un furet dans une conduite et dispositif d'étanchéité pour un tel appareil
AU740258B2 (en) * 1999-09-28 2001-11-01 Petroleo Brasileiro S.A. - Petrobras Remote-controlled vehicle for operations inside pipelines
WO2008039075A1 (fr) * 2006-09-28 2008-04-03 Sub Aqua Technology As Dispositif pour racleur
WO2014062077A1 (fr) * 2012-10-18 2014-04-24 Siemens Aktiengesellschaft Racleur pour nettoyer et/ou inspecter une canalisation, et procédé pour le fonctionnement d'un tel racleur
CN105544720A (zh) * 2016-02-04 2016-05-04 冯振鹏 一种下水道排沙清理机器人
CN105507421A (zh) * 2016-02-04 2016-04-20 冯振鹏 一种下水道清理机器人
CN110206961A (zh) * 2019-07-08 2019-09-06 中北大学 一种管道机器人内封堵系统
CN110206961B (zh) * 2019-07-08 2021-01-15 中北大学 一种管道机器人内封堵系统
CN112157079A (zh) * 2020-09-26 2021-01-01 宜宾学院 一种清管器滚轮式冲击抑制器
CN112495955A (zh) * 2020-12-06 2021-03-16 华能江阴燃机热电有限责任公司 一种可变径管道清理装置
CN116291265A (zh) * 2023-05-24 2023-06-23 陕西华山建设集团有限公司 一种水井井壁清理装置及使用方法
CN116291265B (zh) * 2023-05-24 2023-09-01 陕西华山建设集团有限公司 一种水井井壁清理装置及使用方法

Also Published As

Publication number Publication date
AU5782598A (en) 1998-08-07
NO304357B1 (no) 1998-12-07
NO970253D0 (no) 1997-01-21
NO970253L (no) 1998-07-22

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