EP0457879B1 - Vorrichtung und verfahren zur reinigung eines unterirdischen bohrloches - Google Patents

Vorrichtung und verfahren zur reinigung eines unterirdischen bohrloches Download PDF

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Publication number
EP0457879B1
EP0457879B1 EP91900837A EP91900837A EP0457879B1 EP 0457879 B1 EP0457879 B1 EP 0457879B1 EP 91900837 A EP91900837 A EP 91900837A EP 91900837 A EP91900837 A EP 91900837A EP 0457879 B1 EP0457879 B1 EP 0457879B1
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EP
European Patent Office
Prior art keywords
cleaning
tube
maintenance tube
cleaning head
maintenance
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.)
Expired - Lifetime
Application number
EP91900837A
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English (en)
French (fr)
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EP0457879A1 (de
Inventor
Jean-Claude Ferry
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.)
Societe Nationale Elf Aquitaine Production SA
Original Assignee
Societe National Elf Aquitaine
Societe Nationale Elf Aquitaine Production SA
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Filing date
Publication date
Application filed by Societe National Elf Aquitaine, Societe Nationale Elf Aquitaine Production SA filed Critical Societe National Elf Aquitaine
Publication of EP0457879A1 publication Critical patent/EP0457879A1/de
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Publication of EP0457879B1 publication Critical patent/EP0457879B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • E21B37/00—Methods or apparatus for cleaning boreholes or wells

Definitions

  • the present invention relates to a method for cleaning an underground well and to a device for implementing such a method.
  • a first method consists in reconditioning by means of a drilling device the production conduit at the level of the layer.
  • the application of this method is very expensive because it is necessary to dismantle the equipment in place and after cleaning carry out a new completion.
  • a first drawback lies in the fact that the circulation of the cleaning fluid exerts a back pressure on the often brittle and very sensitive layer (loss, emulsion, precipitate, etc.).
  • a second drawback lies in the fact that the method requires a cable operation beforehand, the limitations in length, load and deviation of which are known.
  • a third drawback relates to training in a sub-hydrostatic or depleted regime: the system by the back pressure that it develops requires the use of fluids produced with low specific weight and compatible with the training; this can become prohibitive.
  • the train of tubes is injected into the well after dismantling the existing completion.
  • the device cannot operate continuously over a large range of sediment accumulation without heavy intervention, such as the addition of additional concentric tubes.
  • the present invention provides a cleaning method according to claim 1.
  • said hydraulic separation is carried out by means of a cable gland mounted, with the possibility of sliding in the cleaning position of the device, on the maintenance tube, which cable gland cooperates with a polished connection (in English: "landing nipple") of the production column to achieve a watertight and sliding separation.
  • the maintenance tube is a so-called “coiled tubing” tube with a diameter less than or equal to 38 mm.
  • the "coiled tubing” is flexible and by this means the process applies equally to vertical wells, deviated wells, strongly deviated wells, or horizontal drains.
  • the “coiled tubing” is remarkable in that it comes into perfect contact with the low generatrix of the highly deviated or horizontal drain.
  • the cable gland includes a set of seals on its internal diameter to allow leaktight sliding of the maintenance tube on said cable gland.
  • the cable gland is shaped to be immobilized in abutment against a shoulder of the polished fitting, and also includes external seals applying to the internal surface of said polished fitting. It is the overpressure in operation that keeps it in this position.
  • the cleaning is then done, in one or more progressive passes, by moving the cleaning head in the part of the well to be cleaned by sliding the maintenance tube through the hydraulic separation, that is to say by sliding the tube to through the cable gland.
  • the cleaning device includes a cleaning device cleaning for carrying out the method of claim 1 comprising a maintenance tube and means for descending inside a production column said maintenance tube, said maintenance tube comprising a cleaning head (7), suitable for the suction of sediment to be extracted, mounted at the end of a tubular extension (5), a cable gland (6) mounted with the possibility of sliding on said tubular extension (5) above said cleaning head (7), a hydro-ejector (3) mounted at the other end of said tubular extension (5), the outlet of the hydro-ejector being connected to the surface by a tube (1) called coiled tubing, said cable gland ( 6) being able to form with a polished connection (12) a hydraulic separation of the directory comprised between the maintenance tube and the production column which isolates the directory under pressure from the bottom of a well, the cleaning device comprising in addition to the means for injec ter in said annular a working fluid for the operation of said hydro-ejector.
  • the cleaning head has an outer diameter less than the internal passage diameter of the polished fitting while the cable gland has an outside diameter greater than the internal passage diameter of the polished fitting, so as to come to a stop in translation on said polished fitting .
  • the cable gland is temporarily immobilized in translation on the cleaning head by means of a pin or any other equivalent means, the rupture of which can be caused by hydraulic overpressure or mechanical support to the 'arrival in the polished fitting.
  • the cleaning head has an ejectable plug for closing the external fluid inlet to the maintenance tube, the ejection of the plug being caused by an overpressure in the maintenance tube.
  • a well-known and widely used intervention technique such as the so-called "coiled tubing” technique is an important advantage.
  • the present invention does not relate to this technique per se, which is known to require surface devices, known per se, such as a well shutter block (BOP), an airlock, a coiled tubing storage reel “, an injector and pumping means, all not described in detail and not shown in the context of the present patent application.
  • BOP well shutter block
  • airlock airlock
  • a coiled tubing storage reel " an injector and pumping means
  • the reference 1 represents a continuous tube of relatively small diameter, less than or equal to 38 mm (1 "1/2).
  • This tube is that of a tool used for intervention operations under pressure in production wells, known as the "coiled tubing" technique, a technique in which a flexible and continuous tube stored on a drum is injected into a pressure well.
  • This technique adapts to any head configuration well and offers a rapid maneuver.
  • the injection system with the well shutter block and the airlock in particular, as well as the "coiled tubing" storage system, the means fluid injection and surface pumping are not shown.
  • a Venturi effect pump or hydro-ejector 3 operating in reverse pumping.
  • valve 3a integrated in the Venturi prevents any return of liquid to the space surrounding the pump, as will be explained below.
  • the pump 3 Via a sealing connection, referenced 4, with a diameter of 38 mm (1 "1/2), the pump 3 is connected to a tubular extension 5 whose diameter is equal to that of the tube 1 and whose length is adjustable according to the dimensional characteristics of the well to be cleaned This length is at least equal to the distance between the level of hydraulic separation chosen (L in the drawing of FIG. 2) and the most distant part of the well to be cleaned.
  • a cable gland 6 is mounted with the possibility of sliding along the tubular extension 5. It is shown in more detail in the drawing of Figure 3. it has on its inner bore 6a a set of O-rings and lip 6b and on its outer bore 6c a set of compressible resilient lip seals 6d, the seals 6b sealing the tubular extension 5 while the outer seals 6d cooperate with an element of the production column (the polished connector or "landing nipple ”) to perform the hydraulic separation as will be seen later.
  • the cable gland 6 is immobilized in translation on the upper part of a cleaning head 7 by a pin 8 (see Figure 3), which can be sheared under the conditions explained below to allow the maintenance tube to slide into the internal bore of the cable gland 6.
  • the end of the extension 5 is temporarily closed by an ejectable plug 7a (see FIG. 4) which has the function in the closed position of allowing the mounting of the pump 3 on the surface.
  • the cleaning head 7, which extends the tubular extension 5, is designed to facilitate cleaning by turbulence and induced rotation.
  • the cleaning head 7 and its mounting at the end of the tubular extension 5 are shown in the drawing in FIG. 4.
  • the ejectable plug 7a is immobilized in the closed position by means of the pin 13.
  • the head is rotatably mounted on a ball bearing bearing 14.
  • a conventional gripping connector 18 comprising the parts 15, 16, 17 allows the attachment of the head 7 to the extension 5.
  • the head is pierced with oblong grooves 19 pierced in non-radial directions, but oriented helically or almost helically, so as to impart, under the effect of the through fluids, a rotational movement to the cleaning head 7 (FIG. 4a) .
  • the reference 9 schematically represents the casing of the well, which can be a vertical well, deviated, or even strongly deviated and even a horizontal drain.
  • the production column is referenced 10.
  • the annular space between the production column 10 and the casing 9 is closed by a seal or packer 11.
  • the cleaning assembly or maintenance tube of FIG. 1 is introduced in the production column 10, which comprises a polished downhole connection 12 forming, by its shoulder 12a, seat for the cable gland 6.
  • the production column 10 is of any diameter.
  • the cleaning system works as follows: The "coiled tubing" wound on the surface on a reel, is inserted without disturbing the pressure prevailing at the top of the well in a seal and operating (stripper), not shown, with the addition of a lubricating grease, with the cleaning head 7 at its free end. Above the cleaning head is inserted the cable gland 6, immobilized in translation with the cleaning head 7 by the pin 8 ( Figure 3).
  • the length of "coiled tubing" inserted in this way in the "stripper” depends on the distance between the most distant part of the well to be cleaned and the location (L) of the polished fitting 12 forming the sliding bearing of the maintenance and separation tube hydraulic.
  • the length of the tubular extension 5 is equal to or greater than the distance indicated above.
  • the "coiled tubing" tube is cut at the surface, security being obtained by the position of the ejectable plug 7a in the cleaning head 7 which prevents any rise of fluid by the "coiled tubing" tube constituting the maintenance tube.
  • the hydro-ejector 3 is inserted by means of a plugging connector 4 shown in the drawing in FIG. 5.
  • This connector 4 comprises a quarter-turn valve 4a, housed in a bore 4b and can be oriented by an axis 4c.
  • This type of connector also includes a plurality of seals 4d and an outer surface of curvilinear profile in the recesses from which the tubular parts of the elements to be connected are forcibly crushed (FIG. 5).
  • This hydraulic separation constitutes an important characteristic of the present invention. Indeed, this separation makes it possible to set in motion and evacuate the sediments without overpressure on the layer, without contact of working fluid with the wall of the well.
  • the cleaning operations take place with isolation of the part of the well to be cleaned thanks to the hydraulic separation carried out by immobilizing the cable gland 6 on the polished connection 12 at the location level L.
  • the ejectable plug 7a is ejected (shearing of the pin 13 or any other means known per se) and falls to the bottom of the cleaning head 7, the bottom of the well is then connected to the surface (see figure 4).
  • the working fluid pumped from the surface starts the suction of the hydro-ejector 3 through the cleaning head 7 and the tubular extension 5.
  • the sediments are sucked in through the orifices 19 of the cleaning head, rise up through the extension tube 5, the connector 4, the hydro-ejector 3 and the tube 1 towards the surface.
  • the cleaning head 7 can be a rotary head with a cyclone effect by the conformation of the orifices along helical lines, as already mentioned.
  • the working fluid is replaced by a fluid which does not pollute the tank and which may or may not stabilize the well. If this fluid is gas, the well generates overhead pressure.
  • the maintenance tube is closed internally when arriving at the surface by a shutter 4a housed in the connector 4 placed under the hydro-ejector 3, which allows the withdrawal of the hydro-ejector and the joining of the "coiled tubing" to continue the extraction thereof under contained pressure.
  • any leak in the packing gland does not condemn the cleaning method, it simply results in a reduction in energy efficiency compensated by an increase in the flow of engine liquid .

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  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Cleaning In General (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Sewage (AREA)
  • Refuse Collection And Transfer (AREA)
  • Vending Machines For Individual Products (AREA)
  • Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Earth Drilling (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
  • Processing Of Solid Wastes (AREA)

Claims (11)

  1. Verfahren zur Reinigung eines vertikalen, gekrümmten oder horizontalen, mit einer Fördersäule ausgestatteten unterirdischen Schachtes, bei dem
    - im Inneren der Säule (10) ein Wartungsrohr (1 bis 7) abwärts geführt wird, das an seinem Ende einen Reinigungskopf (7) zum Absaugen zu entfernender Ablagerungen aufweist,
    - auf einem bestimmten Niveau (L) oberhalb des zu reinigenden Teils des Schachtes eine hydraulische Abtrennung des Ringraums zwischen dem Wartungsrohr (1 bis 7) und der Fördersäule (10) angeordnet wird, und
    - in den Ringraum ein Treibfluid zur Aktivierung einer Wasserstrahlpumpe eingespritzt wird, die das Absaugen der zu entfernenden Ablagerungen durch das Wartungsrohr (1 bis 7) bewirkt, wobei die hydraulische Abtrennung den unter Überdruck (LH) stehenden Ringraum vom unter Unterdruck stehenden Grund des Schachtes trennt,
    dadurch gekennzeichnet, daß der Reinigungskopf (7) im zu reinigenden Teil des Schachtes durch Gleitverschiebung des Wartungsrohres (1 bis 7) durch die hydraulischen Abtrennung hindurch verschoben wird.
  2. Verfahren zur Reinigung eines unterirdischen Schachtes nach Anspruch 1, dadurch gekennzeichnet, daß die hydraulische Abtrennung mit Hilfe einer Stopfbüchse (6) verwirklicht wird, die so angeordnet ist, daß sie auf einem rohrförmigen Teil oder einem Fortsatz (5) des Wartungsrohres (1 bis 7) verschoben werden kann, und die auf dem Niveau der hydraulischen Abtrennung formschlüssig und dicht mit einem polierten Paßstück (12) der Fördersäule (10) zusammenwirkt.
  3. Verfahren zur Reinigung eines unterirdischen Schachtes nach Anspruch 1, dadurch gekennzeichnet, daß das Wartungsrohr im wesentlichen aus einem sogenannten coiled-tubing-Rohr besteht mit einem Durchmesser, der kleiner als 38 mm ist oder 38 mm beträgt.
  4. Verfahren zur Reinigung eines unterirdischen Schachtes nach Anspruch 3, dadurch gekennzeichnet, daß die Stopfbüchse (6) so angepaßt ist, daß sie gegen Verschiebung durch Anschlag an dem polierten Paßstück (12) festgelegt wird, und äußere Dichtungsringe (6d) hat, die auf der Innenfläche des polierten Paßstücks (12) so anliegen, daß sie eine dichte hydraulische Abtrennung bilden.
  5. Reinigungsvorrichtung zur Durchführung des Verfahrens nach Anspruch 1 mit einem Wartungsrohr und Einrichtungen zum abwärts Führen des Wartungsrohres im Inneren einer Fördersäule, wobei das Wartungsrohr einen zum Absaugen der zu entfernenden Ablagerungen geeigneten, am Ende eines rohrförmigen Fortsatzes (5) angebrachten Reinigungskopf (7), eine auf dem rohrförmigen Fortsatz (5) oberhalb des Reinigungskopfes (7) gleitend verschiebbar angebrachte Stopfbüchse (6), und eine am anderen Ende des rohrförmigen Fortsatzes (5) angebrachte Wasserstrahlpumpe (3) umfaßt, wobei der Ausgang der Wasserstrahlpumpe mit der Oberfläche durch ein sogenanntes coiled-tubing-Rohr (1) verbunden ist, die Stopfbüchse (6) geeignet ist, mit dem polierten Paßstück (12) eine hydraulische Abtrennung des Ringraums zwischen dem Wartungsrohr und der Fördersäule zu bilden, welche den unter Überdruck stehenden Ringraum vom Grund eines Schachtes trennt, und die Reinigungsvorrichtung weiterhin Einrichtungen zum Einspritzen eines Treibfluids in den Ringraum zum Aktivieren der Wasserstrahlpumpe umfaßt.
  6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet daß der Außendurchmesser des Reinigungskopfs (7) kleiner ist als der Durchmesser des inneren Durchgangs des polierten Paßstücks (12).
  7. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß der Außendurchmesser der Stopfbüchse (6) größer ist als der Durchmesser des inneren Durchgangs des polierten Paßstücks (12), so daß diese an dem polierten Paßstück anschlägt.
  8. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß die Stopfbüchse (6) gegen Verschiebung auf dem rohrförmigen Fortsatz (5) mit Hilfe eines Stiftes (18) vorläufig festgelegt ist, dessen Bruch durch hydraulischen Überdruck auf die obere Fläche der Stopfbüchse hervorgerufen werden kann.
  9. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß die Wasserstrahlpumpe (3) eine äußere Abmessung hat, die auf 50 bis 63 mm verkleinert ist, und eine eingebaute Klappe (3a) hat, um jeglichen Flüssigkeitsrückstrom zu dem Ringraum zwischen der Fördersäule (10) und dem Wartungsrohr (1 bis 7) zu unterbinden.
  10. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß der Reinigungskopf (7) einen ausstoßbaren Stopfen (7a) für den Verschluß des Fluideinlasses zum Wartungsrohr (1 bis 7) hin umfaßt, wobei der Ausstoß des Stopfens (7a) durch Überdruck im Wartungsrohr verursacht wird.
  11. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß der Reinigungskopf (7) ein Zykloneffekt-Drehkopf ist.
EP91900837A 1989-12-11 1990-12-10 Vorrichtung und verfahren zur reinigung eines unterirdischen bohrloches Expired - Lifetime EP0457879B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR8916346 1989-12-11
FR8916346A FR2655684B1 (fr) 1989-12-11 1989-12-11 Procede de nettoyage d'un puits souterrain et dispositif pour la mise en óoeuvre d'un tel procede.
PCT/FR1990/000895 WO1991009205A1 (fr) 1989-12-11 1990-12-10 Dispositif et procede de nettoyage d'un puits souterrain

Publications (2)

Publication Number Publication Date
EP0457879A1 EP0457879A1 (de) 1991-11-27
EP0457879B1 true EP0457879B1 (de) 1994-08-24

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EP91900837A Expired - Lifetime EP0457879B1 (de) 1989-12-11 1990-12-10 Vorrichtung und verfahren zur reinigung eines unterirdischen bohrloches

Country Status (9)

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US (1) US5158140A (de)
EP (1) EP0457879B1 (de)
AT (1) ATE110438T1 (de)
DE (1) DE69011850D1 (de)
DK (1) DK0457879T3 (de)
FR (1) FR2655684B1 (de)
NO (1) NO301728B1 (de)
OA (1) OA09390A (de)
WO (1) WO1991009205A1 (de)

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US5447200A (en) * 1994-05-18 1995-09-05 Dedora; Garth Method and apparatus for downhole sand clean-out operations in the petroleum industry
US5462118A (en) * 1994-11-18 1995-10-31 Mobil Oil Corporation Method for enhanced cleanup of horizontal wells
US6085844A (en) * 1998-11-19 2000-07-11 Schlumberger Technology Corporation Method for removal of undesired fluids from a wellbore
GB9922378D0 (en) * 1999-09-22 1999-11-24 Specialised Petroleum Serv Ltd Apparatus incorporating jet pump for well head cleaning
US7048056B1 (en) 2003-08-11 2006-05-23 Blake Mark A Down-hole well cleaning tool
US20060086507A1 (en) * 2004-10-26 2006-04-27 Halliburton Energy Services, Inc. Wellbore cleanout tool and method
GB0507408D0 (en) * 2005-04-13 2005-05-18 Petrowell Ltd Apparatus
EP1852571A1 (de) * 2006-05-03 2007-11-07 Services Pétroliers Schlumberger Bohrlochreinigung mit Bohrlochpumpen
US20100000738A1 (en) * 2006-08-03 2010-01-07 Azra Nur Tutuncu Cleaning apparatus and methods
WO2008016961A1 (en) * 2006-08-03 2008-02-07 Shell Oil Company Drilling method and downhole cleaning tool
US7878247B2 (en) * 2009-01-08 2011-02-01 Baker Hughes Incorporated Methods for cleaning out horizontal wellbores using coiled tubing
WO2011100537A1 (en) * 2010-02-15 2011-08-18 Frank's International, Inc. Device and method for affecting the flow of fluid in a wellbore
US8931558B1 (en) * 2012-03-22 2015-01-13 Full Flow Technologies, Llc Flow line cleanout device
US8960297B1 (en) * 2014-07-23 2015-02-24 Daman E. Pinson Well cleanout tool
WO2019104212A1 (en) * 2017-11-22 2019-05-31 Quanta Associates, L.P. Annular pressure reduction system for horizontal directional drilling
CN115443367B (zh) * 2020-05-07 2023-11-07 贝克休斯油田作业有限责任公司 用于完井井筒的化学品注入系统
CN116000028B (zh) * 2023-01-16 2024-07-12 东营汇聚丰石油科技有限公司 一种利用连续油管清洗堵塞管线的装置及方法

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Also Published As

Publication number Publication date
WO1991009205A1 (fr) 1991-06-27
NO913111L (no) 1991-10-10
US5158140A (en) 1992-10-27
EP0457879A1 (de) 1991-11-27
FR2655684B1 (fr) 1995-09-22
ATE110438T1 (de) 1994-09-15
DK0457879T3 (da) 1994-12-19
NO301728B1 (no) 1997-12-01
OA09390A (fr) 1992-09-15
FR2655684A1 (fr) 1991-06-14
NO913111D0 (no) 1991-08-09
DE69011850D1 (de) 1994-09-29

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