EP0842347B9 - Vorrichtung und verfahren zum verrohren einer leitungverzweigung, insbesondere in einer erdölbohrung - Google Patents

Vorrichtung und verfahren zum verrohren einer leitungverzweigung, insbesondere in einer erdölbohrung Download PDF

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Publication number
EP0842347B9
EP0842347B9 EP96927724A EP96927724A EP0842347B9 EP 0842347 B9 EP0842347 B9 EP 0842347B9 EP 96927724 A EP96927724 A EP 96927724A EP 96927724 A EP96927724 A EP 96927724A EP 0842347 B9 EP0842347 B9 EP 0842347B9
Authority
EP
European Patent Office
Prior art keywords
preform
section
well
main
main section
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
EP96927724A
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English (en)
French (fr)
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EP0842347A1 (de
EP0842347B1 (de
Inventor
James Leighton
Jean-Louis Saltel
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.)
Drillflex
Original Assignee
Drillflex
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
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Publication of EP0842347A1 publication Critical patent/EP0842347A1/de
Application granted granted Critical
Publication of EP0842347B1 publication Critical patent/EP0842347B1/de
Publication of EP0842347B9 publication Critical patent/EP0842347B9/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
    • E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
    • E21B41/0035—Apparatus or methods for multilateral well technology, e.g. for the completion of or workover on wells with one or more lateral branches
    • E21B41/0042—Apparatus or methods for multilateral well technology, e.g. for the completion of or workover on wells with one or more lateral branches characterised by sealing the junction between a lateral and a main bore
    • 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
    • E21B43/02—Subsoil filtering
    • E21B43/10—Setting of casings, screens, liners or the like in wells
    • E21B43/103—Setting of casings, screens, liners or the like in wells of expandable casings, screens, liners, or the like

Definitions

  • the subject of the present invention is a device and a method for lining of a bifurcation of wells, in particular of oil wells.
  • the invention finds more especially application for the lining watertight in the junction zone between a main borehole generally (but not necessarily) vertical and bias drilling from the vertical well, bias drilling commonly referred to in the trade by the English term "side track”.
  • this type of secondary drilling is used to access lateral oil tanks, once the main tank is depleted, has become insufficiently profitable, or simply to increase the productivity of a well.
  • This type of drilling also makes it possible to considerably extend the production area in areas with difficult access, without having to drill a new well surface ; this is particularly the case for the exploitation of deposits located under the sea.
  • a curable liquid for example an epoxy resin.
  • the bladder is deflated and removed. Finally, we drill the plug of hardened material which closes the secondary well so as to dig there a passage.
  • the present invention proposes to transpose this known technique to lining the bifurcation zone in which the main borehole connects to the borehole secondary.
  • the objective of the invention is to propose a simple and inexpensive device expensive, light, easy to install, and allows to obtain a perfect seal of the junction in the bifurcation zone.
  • the device for lining a well bifurcation, in particular a oil well, which is the subject of the present invention comprises - like this is known per se - a flexible, radially deformable and expandable tubular preform under the effect of an internal pressure, and curable in situ by hot polymerization of its wall.
  • This device is remarkable in that said preform is formed of a straight main section and a secondary section also straight forming a acute angle with the main section and connecting to the latter in a leaktight manner a middle zone, provisional restraint means being provided which make it possible to initially maintain the secondary section in the radially folded state applied against the main section, the assembly then constituting a rectilinear preform, while after removal of said temporary restraint means, and under pressure internal the secondary section is detached from the main section, the assembly then constituting a preform in the general form of "y", (whose lower bar is in the extension of one of the upper branches).
  • the preform which constitutes the essential part of the device according to the invention, referenced 1
  • the preform is a flexible preform, foldable longitudinally on itself to occupy space weak radial, and which can be put to the round first under the effect of a pressure internal moderately, then radially expanded under the effect of greater internal pressure.
  • this preform 1 comprises a straight main section 10 and a secondary section 11 which forms an acute angle with the main section, and connects to it in its middle zone.
  • the preform therefore has the general appearance of an inverted "y", the bifurcation of which is directed downward, that is to say towards the bottom of the well.
  • 10a the branch of the main section located on the side of the opening of the well and by 10b the other branch, facing the bottom of the well, this branch facing the secondary section 11.
  • the branches 10a and 10b each have a length La , respectively Lb of between 3 and 5m, while the secondary section 11 has a length L of the order of 2 to 4m.
  • the tubular sections 10 and 11 have a shape cylindrical.
  • the main section 10 has an outside diameter of the order of 100mm and an inside diameter of around 50mm, while section 11 has a outer diameter between 80 and 100mm and an inner diameter between 30 and 50mm.
  • the angle ⁇ is for example of the order of 30 °.
  • the preform 1, as well as the internal dilator tool, which will be described more far away, are attached, at the high end of the preform, to a tool 2 which is integral with the end of a cable, flexible tube or suitable tool 20 which emerges from the well by its opposite end, through the wellhead.
  • An apparatus located at the well head makes it possible to lower the tube 20 in the well, in order to bring the preform into the desired position, the tube cable or tool and tool 2 being removed at the end of the operation, as is well known.
  • the tubular preform 1 has a multilayer structure which, so general, includes an outer skin and an inner skin between which is confined a thermosetting resin, initially flexible and malleable.
  • This shaping provides space for the section 11 which, by being also deformed, can be applied intimately against section 10b so that the two adjoining sections are part of a fictitious cylinder extending the section axially 10a (see Figures 1 and 5A).
  • the preform is kept in this folded and compressed state, using a series of regularly spaced annular compression links 3.
  • These are for example fiberglass cables.
  • These links have an increasing tensile strength for example gradually from bottom to top, the lower link being able to break more easily than the neighbor link above, and so on, to the top link, which is proximity of the connection area 10c of the section 11 with the main section
  • FIG 6 there is shown in section the bifurcation well that we wish to tub. This includes an often vertical main borehole 4, provided with a cylindrical metal casing 40, and a bias bore 5 also provided with casing metallic 50, surrounded by cement 51.
  • junction zone of the two boreholes, designated 6, is surrounded by soil 60 or there is the problem of sealing to be ensured, given that the casings 40 and 50 do not are not related.
  • the device according to the invention comprises, mounted inside the preform 1, a dilator in the form of an inflatable bladder, with flexible membrane and elastic, inside which it is possible to introduce, either from the head of well, or by pumping the liquid present in the well, a pressurized fluid - by example of water or petroleum - the pressure of which can be varied, by controlling.
  • the membrane 7 has been designated by the reference 7 constituting the bladder, into which opens the tool 2, and which is closed at its low ends.
  • the bladder has the shape of an inverted "y”, complementary to its housing inside the preform.
  • the wall of the preform made of thermosetting material, is referenced 8.
  • FIG. 6 which shows the start of the lining operation
  • the preform 1, suspended from the tool 2 and the tube or tool cable 20 has been lowered into the well so that the free (closed) end 110 of the section secondary 11 is positioned in the bifurcation zone 6, substantially at the mouth secondary drilling 5.
  • the displacement of the preform in the well is easy because it has a straight configuration and has a small radial footprint.
  • the fluid pressure inside the bladder 7 is then increased, to a value P substantially greater than a P 0 .
  • the upper and lower ends of the main section of the preforms are intimately applied against the casing 40; similarly, the area free end of the secondary section 11 is intimately applied against the casing 50.
  • the middle area of the preform is not necessarily in contact with the wall 60, but this does not matter.
  • the preform becomes rigid and the desired tubing, in the form of a perfectly sealed inverted "y" conduit ensuring the connection of the casings 40 and 50.
  • the bladder 7 is then deflated by pumping the liquids which were there, then said bladder is torn off by removing the tool 2 and the bladder deflated adjoining it.
  • the means of restraint could consist of a fabric sheath tear longitudinally, from bottom to top, surrounding the preform parts 10b and 11.
  • the internal pressures P 0 and P are in fact differential pressures between the interior and exterior pressures of the preform.
  • P 0 is less than or equal to approximately 3 bars, while P is of the order of 30 bars.
  • each of the sections 10 and 11 will be chosen according to the real conditions encountered on the land, in particular according to the diameter of the main and secondary drilling and the angle that these two holes form between them.
  • the device according to the invention can allow to seal and consolidate pipeline bifurcations.

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  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Pipeline Systems (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Claims (5)

  1. Vorrichtung zur Auskleidung einer Verzweigung eines Bohrbrunnens, insbesondere eines Ölbohrschachtes, oder einer Kanalisation, dadurch gekennzeichnet, dass sie einen elastischen, röhrenförmigen Vorformling aufweist, der radial verformbar und unter der Wirkung eines Innendrucks dehnbar und in situ durch Heißpolymerisation seiner Wand zu härten ist, wobei dieser Vorformling von einem geradlinigen Hauptteilstück (10) und einem ebenfalls geradlinigen Nebenteilstück (11) gebildet ist, welches mit dem Hauptteilstück (10) einen spitzen Winkel (α) bildet und sich an dieses letztere dicht in einem Mittelbereich (10c) anschließt, wobei Vorrichtungen zum provisorischen Umschließen (3) vorgesehen sind, welche ermöglichen, das Nebenteilstück (11) anfänglich in einem radial eingezogenen und gegen das Hauptteilstück (10) gepressten Zustand zu halten, wodurch die Anordnung insgesamt einen geradlinigen Vorformling bildet, während sich das Nebenteilstück (11) nach dem Abnehmen der provisorischen Umschließvorrichtungen und unter der Wirkung eines Innendrucks von dem Hauptteilstück (10) ablöst, wodurch die Anordnung dann einen Vorformling mit der allgemeinen Form eines "Y" bildet.
  2. Vorrichtung gemäß Anspruch 1, dadurch gekennzeichnet, dass sie ein Ausdehnungswerkzeug in Form eines aufblasbaren Balgs (7) mit biegsamer und elastischer Membran aufweist, der im Inneren des Vorformlings angeordnet und am Ende des Arbeitsvorgangs abnehmbar ist.
  3. Vorrichtung gemäß einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass jedes der Teilstücke (10, 11) im ausgedehnten Zustand einen kreisförmigen Querschnitt aufweist, wobei der Durchmesser des Hauptteilstücks (10) größer als derjenige des Nebenteilstücks (11) oder identisch mit diesem letzteren ausgebildet ist.
  4. Vorrichtung gemäß einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Umschließvorrichtungen (3) aus ausfransbaren, ringförmigen Verbindungsgliedern bestehen, welche das Haupt- und Nebenteilstück (10, 11) umgeben, und welche in der Lage sind, jenseits einer bestimmten Innendruckschwelle nacheinander zu zerreißen.
  5. Verfahren zur dichten Auskleidung einer Verzweigung eines Bohrbrunnen, insbesondere eines Ölbohrschachtes mit einer Hauptbohrung (4) und einer schräg liegenden Nebenbohrung (5), dadurch gekennzeichnet, dass eine Vorrichtung gemäß den zusammen genommenen Ansprüchen 2 bis 4 eingesetzt wird, welche einen Vorformling aufweist, dessen Winkel (α), den das Haupt- (10) und Nebenteilstück (11) bilden, demjenigen der Verzweigung nahe kommt, und dass wie folgt vorgegangen wird:
    a) der Vorformling wird in den Bohrbrunnen herabgelassen, solange er sich im radial zusammengelegten Zustand befindet und das Nebenteilstück (11) gegen das Hauptteilstück (10) gepresst ist, wodurch der Gesamtkomplex eine geradlinige Konfiguration aufweist;
    b) der Vorformling wird in dem Bereich der Verzweigung (6) derart angeordnet, dass das freie Ende (110) des Nebenteilstücks (11) am Eingang der schräg liegenden Bohrung (5) liegt;
    c) der Vorformling wird unter mäßigem Druck (P0) derart aufgeblasen (Voraufblasen), dass bewirkt wird, dass die Umschließverbindungsglieder (3) nacheinander zerreißen, und sich in Korrelation dazu das Nebenteilstück (11) nacheinander radial entfaltet und im Winkel abspreizt, wobei begleitend dazu das Absenken des Vorformlings fortgesetzt wird;
    d) wenn der Verzweigungsbereich des Vorformlings (10c) praktisch auf der Höhe des Verzweigungsbereiches (6) des Bohrbrunnens angeordnet ist, wird die Absenkbewegung gestoppt;
    e) der Vorformling wird unter Erhöhung seines Innendrucks (P) aufgeblasen, um seine radiale Ausdehnung zu bewirken und ihn gegen die Wände des Bohrbrunnens zu pressen;
    f) während der Druck (P) aufrechterhalten wird, wird der Vorformling derart erhitzt, dass eine Polymerisation seiner Wand stattfindet;
    g) der Balg (7) wird entleert und von dem Vorformling getrennt.
EP96927724A 1995-08-04 1996-08-02 Vorrichtung und verfahren zum verrohren einer leitungverzweigung, insbesondere in einer erdölbohrung Expired - Lifetime EP0842347B9 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9509695A FR2737534B1 (fr) 1995-08-04 1995-08-04 Dispositif de chemisage d'une bifurcation d'un puits, notamment de forage petrolier, ou d'une canalisation, et procede de mise en oeuvre de ce dispositif
FR9509695 1995-08-04
PCT/FR1996/001225 WO1997006345A1 (fr) 1995-08-04 1996-08-02 Dispositif et procede pour le chemisage d'une bifurcation de canalisation, en particulier dans un puits petrolier

Publications (3)

Publication Number Publication Date
EP0842347A1 EP0842347A1 (de) 1998-05-20
EP0842347B1 EP0842347B1 (de) 2003-05-02
EP0842347B9 true EP0842347B9 (de) 2003-10-22

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EP96927724A Expired - Lifetime EP0842347B9 (de) 1995-08-04 1996-08-02 Vorrichtung und verfahren zum verrohren einer leitungverzweigung, insbesondere in einer erdölbohrung

Country Status (8)

Country Link
US (1) US5964288A (de)
EP (1) EP0842347B9 (de)
AT (1) ATE239169T1 (de)
AU (1) AU6744096A (de)
DE (1) DE69627863D1 (de)
FR (1) FR2737534B1 (de)
NO (1) NO311628B1 (de)
WO (1) WO1997006345A1 (de)

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Also Published As

Publication number Publication date
ATE239169T1 (de) 2003-05-15
AU6744096A (en) 1997-03-05
EP0842347A1 (de) 1998-05-20
DE69627863D1 (de) 2003-06-05
US5964288A (en) 1999-10-12
NO980429L (no) 1998-04-03
NO311628B1 (no) 2001-12-17
FR2737534B1 (fr) 1997-10-24
EP0842347B1 (de) 2003-05-02
FR2737534A1 (fr) 1997-02-07
NO980429D0 (no) 1998-01-30
WO1997006345A1 (fr) 1997-02-20

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