EP1092077B1 - Frässystem zum erstellen eines fensters in einem rohr - Google Patents

Frässystem zum erstellen eines fensters in einem rohr Download PDF

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Publication number
EP1092077B1
EP1092077B1 EP99931252A EP99931252A EP1092077B1 EP 1092077 B1 EP1092077 B1 EP 1092077B1 EP 99931252 A EP99931252 A EP 99931252A EP 99931252 A EP99931252 A EP 99931252A EP 1092077 B1 EP1092077 B1 EP 1092077B1
Authority
EP
European Patent Office
Prior art keywords
milling
milling tool
window
casing
guiding device
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
EP99931252A
Other languages
English (en)
French (fr)
Other versions
EP1092077A1 (de
Inventor
Taco Sjoerd Hoekstra
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.)
Shell Internationale Research Maatschappij BV
Original Assignee
Shell Internationale Research Maatschappij BV
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 Shell Internationale Research Maatschappij BV filed Critical Shell Internationale Research Maatschappij BV
Priority to EP99931252A priority Critical patent/EP1092077B1/de
Publication of EP1092077A1 publication Critical patent/EP1092077A1/de
Application granted granted Critical
Publication of EP1092077B1 publication Critical patent/EP1092077B1/de
Anticipated expiration legal-status Critical
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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
    • E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
    • E21B29/06—Cutting windows, e.g. directional window cutters for whipstock operations
    • 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
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/04—Directional drilling
    • E21B7/06—Deflecting the direction of boreholes
    • E21B7/061—Deflecting the direction of boreholes the tool shaft advancing relative to a guide, e.g. a curved tube or a whipstock

Definitions

  • the present invention relates to a system for milling a window in a casing arranged in a borehole formed in an earth formation according to the preamble of claim 1.
  • a milling system is known from EP-A-0 791 722.
  • a window is created by fixedly positioning a whipstock having a slanted guide-way, within the casing and guiding a milling tool along the guide-way during milling of the window.
  • the downhole force required to progress the milling tool along the guide-way is supplied from surface via a pipe string connected to the milling tool. Fluid is pumped through the pipe string to operate the milling tool and to remove the milling cuttings from the borehole.
  • a problem of the conventional system for milling a window in a casing is that the downhole force required to progress the milling tool along the guide-way is insufficiently controllable. This is, for example, due to frictional forces which counter-act the downward force acting on the pipe string, and due to uncontrolled bending of the pipe string within the casing.
  • the thrust force necessary for progressing the milling tool during milling is provided from the guiding device rather than from surface.
  • the guiding device can be provided with a hydraulic motor or an electric motor receiving power from surface via a suitable control system.
  • casing refers to any elongate hollow element which is arranged in the borehole and in which a window is to be milled, such as a cemented casing or a wellbore liner.
  • the guiding device is provided with a guide-way defining said selected path and with means for preventing movement of the milling tool transverse to the guide-way. In this manner it is achieved that undesired "walk” of the mill during milling is prevented and that an accurate shape of the window is obtained.
  • the selected path extends substantially parallel to the longitudinal axis of the casing.
  • the upper window portion is milled by the upper side of the mill and the lower window portion by the lower side of the mill.
  • the upper window portion will be biased in one direction (depending on the direction of rotation of the mill) and the lower window portion in the other direction.
  • a borehole 1 has been formed in an earth formation 2 and provided with a steel casing 3.
  • the embodiment 4 of the system according to the invention includes a retrievable downhole packer 5 fixedly positioned at a selected location in the casing 3 and provided with an upwardly extending latching element 7 adapted to receive and fixedly hold a support column 9 of a guiding device 11 in a selected orientation.
  • the guiding device 11 includes a ramp element 14 rigidly connected to the support column 9 and provided with a secondary support element 16 which is radially extendible against the inner surface of the casing 3.
  • the ramp element 14 extends inclined relative to the longitudinal axis of the casing 3 and defines inclined, opposite, directions 20, 22 of a path along which a milling tool 18 is movable, direction 20 being inclined downwardly and direction 22 being inclined upwardly.
  • the ramp element 14 is internally provided with a thrust means in the form of a chain (not shown) movable in the directions 20,22 and an electric motor (not shown) for driving the chain.
  • the milling tool 18 has legs 24, 26 which are connected to the chain so that movement of the chain in directions 20, 22 results in corresponding movement of the milling tool 18.
  • the milling tool is internally provided with a hydraulic motor (not shown) for driving a mill 27 of the milling tool, the hydraulic motor receiving hydraulic fluid via a coiled tubing 30 extending through the casing 3 to a hydraulic pump (not shown) at surface, the coiled tubing being connected to the hydraulic motor by means of a flexible hose 31.
  • the mill 27 has a plurality of outlet nozzles (not shown) for hydraulic fluid from the motor.
  • the coiled tubing is provided with.a connector (not shown) for connecting the coiled tubing to the guiding device 11 so as to lower and retrieve the guiding device 11 and milling tool 18 through the wellbore 1.
  • An electric power supply cable 32 extends from a control unit (not shown) at surface, through the coiled tubing 30 and the hose 31, to the milling tool 18 and from there via one of the legs 24, 26 to the electric motor of the ramp element 14.
  • the control unit is provided with controls for selectively moving the chain in direction 20 or 22.
  • the control unit includes a control for selectively extending or refracting the secondary support element 16 relative to the inner surface of the casing 3.
  • the packer 5 with the latching element connected thereto is fixedly positioned at a selected location in the casing 3 at an orientation corresponding to the desired orientation of the window to be milled.
  • the guiding device 11 is connected to the coiled tubing 30 by means of the connector and the combined guiding device 11/milling tool 18 are then lowered by coiled tubing 30 through the casing 3.until the support column 9 latches into latching element 7. Subsequently the control unit at surface is operated to provide a control signal via power supply cable 32 to the guiding device so as to radially extended support element 16 against the casing 3.
  • Hydraulic fluid is then pumped through the coiled tubing 30 thereby driving the hydraulic motor so as to rotate the mill 27.
  • the control unit at surface is operated so as to move the chain and the milling tool 18 in the direction 20 in order to mill the window.
  • the cuttings resulting from the milling operation are entrained and transported away by the hydraulic fluid exiting through the nozzles of the mill 27.
  • the control unit is operated zo move the milling tool 18 in direction 22 away from the casing 3 and to retract the support element 16.
  • the combined guiding device 11/milling tool 18 are then retrieved to surface by means of the coiled tubing 30.
  • the packer 5 and latching element 7 are subsequently retrieved to surface in any suitable manner.
  • these devices can be integrated into one tool, optionally also including the packer and latching element.
  • the thrust means is one of a worm-gear having a spindle extending in the direction along which the milling tool is guided and a hydraulic piston/cylinder assembly extendible in said direction.
  • the milling device can be provided with measuring means for measuring parameters such as the torque delivered by the output shaft of the milling tool, the thrust force delivered by the thrust means, and the position of the milling tool along said path.
  • the measuring means is in communication with a data receiving station at surface via a data transmission cable extending through a tubing, e.g. the coiled tubing referred to above.

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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)
  • Earth Drilling (AREA)
  • Drilling And Boring (AREA)
  • Window Of Vehicle (AREA)
  • Glass Compositions (AREA)
  • Wing Frames And Configurations (AREA)

Claims (11)

  1. System zum Fräsen eines Fensters in einer Auskleidung, die in einem Bohrloch angeordnet ist, das in einer Erdformation ausgebildet ist, mit einem Fräswerkzeug (18) zum Fräsen eines solches Fensters, einer Führungsvorrichtung (11) zum Führen des Fräswerkzeuges entlang eines vorbestimmten Pfades innerhalb der Auskleidung während des Fräsens des Fensters, wobei die Führungsvorrichtung mit Mitteln (5-9) zum fixen Anordnen der Führungsvorrichtung innerhalb der Auskleidung versehen ist, wobei die Führungsvorrichtung mit Antriebsmitteln zum Beaufschlagen des Fräswerkzeuges entlang des vorbestimmten Pfades während des Fräsens des Fensters ausgestattet ist, wobei ein Motor derart angeordnet ist, daß er einen Fräser (27) des Fräswerkzeuges antreibt, dadurch gekennzeichnet, daß der Motor und die Antriebsmittel derart ausgebildet sind, daß die Betätigung der Antriebsmittel sowohl den Motor als auch das Fräswerkzeug gemeinsam entlang des vorbestimmten Pfades beaufschlagt.
  2. System nach Anspruch 1, bei welchem die Antriebsmittel eine Kette aufweisen, die in Richtung des Pfades bewegbar ist, ein Schneckengetriebe mit einer Spindel, die sich in Richtung des Pfades erstreckt, und eine hydraulische Kolben/Zylinderanordnung, die in Richtung des Pfades ausfahrbar ist.
  3. System nach Anspruch 1 oder 2, bei welchem die Führungsvorrichtung (11) mit einer Führungsbahn versehen ist, welche den vorbestimmten Pfad definiert, und mit Mitteln zum Verhindern einer Bewegung des Fräswerkzeuges quer zur Führungsbahn.
  4. System nach einem der Ansprüche 1-3, bei welchem sich der vorbestimmte Pfad im wesentlichen parallel zur Längsachse der Auskleidung erstreckt.
  5. System nach einem Ansprüche 1-4, bei welchem das Fräswerkzeug (18) eine Ausgangswelle hat, die von einem Hydraulikmotor angetrieben ist, wobei der Hydraulikmotor mit einer hydraulischen Fluidversorgung über ein Rohr (31) verbunden ist, das sich durch die Auskleidung zur Oberfläche erstreckt und eine Auslaßöffnung für Hydraulikfluid aufweist, die so angeordnet ist, daß das Hydraulikfluid die vom Fräsen des Fensters resultierenden Späne mitreißen kann.
  6. System nach Anspruch 5, bei welchem die Antriebsmittel von einem elektrischen Motor angetrieben sind, der mit einem elektrischen Energieversorgungskabel (32) verbunden ist, das sich durch das Rohr erstreckt.
  7. System nach Anspruch 5 oder 6, bei welchem das Rohr ein gewendeltes Rohr ist.
  8. System nach einem der Ansprüche 1-7, bei welchem die Fräsvorrichtung mit Meßmitteln zum Messen zumindest einer Größe aus Drehmoment, das von der Ausgangswelle des Fräswerkzeuges abgegeben wird, aus der von den Antriebsmitteln abgegebenen Antriebskraft und aus der Position des Fräswerkzeuges entlang des Pfades ausgestattet ist.
  9. System nach Anspruch 8, rückbezogen auf Anspruch 5, bei welchem die Meßmittel mit einer Datenempfangsstation an der Oberfläche über ein Datenübertragungskabel in Verbindung stehen, das sich durch das Rohr erstreckt.
  10. System nach einem der Ansprüche 1-9, das ferner eine Fortschaltvorrichtung zum Orientieren des Fräswerkzeuges in unterschiedlichen Orientierungen relativ zur Führungsvorrichtung aufweist, damit das Fenster in mehreren Durchgängen des Fräswerkzeuges gefräst werden kann, wobei jeder Durchgang einer dieser Orientierungen des Fräswerkzeuges relativ zur Führungsvorrichtung entspricht.
  11. System nach einem der Ansprüche 1-10, bei welchem sich der vorbestimmte Pfad im wesentlichen in Längsrichtung der Auskleidung erstreckt.
EP99931252A 1998-07-02 1999-06-30 Frässystem zum erstellen eines fensters in einem rohr Expired - Lifetime EP1092077B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP99931252A EP1092077B1 (de) 1998-07-02 1999-06-30 Frässystem zum erstellen eines fensters in einem rohr

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP98305275 1998-07-02
EP98305275 1998-07-02
EP99931252A EP1092077B1 (de) 1998-07-02 1999-06-30 Frässystem zum erstellen eines fensters in einem rohr
PCT/EP1999/004700 WO2000001921A1 (en) 1998-07-02 1999-06-30 Milling system for forming a window in the wall of a tubular

Publications (2)

Publication Number Publication Date
EP1092077A1 EP1092077A1 (de) 2001-04-18
EP1092077B1 true EP1092077B1 (de) 2006-10-11

Family

ID=8234910

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99931252A Expired - Lifetime EP1092077B1 (de) 1998-07-02 1999-06-30 Frässystem zum erstellen eines fensters in einem rohr

Country Status (8)

Country Link
EP (1) EP1092077B1 (de)
AR (1) AR019187A1 (de)
AU (1) AU751528B2 (de)
CA (1) CA2336326C (de)
DE (1) DE69933564T2 (de)
GC (1) GC0000060A (de)
NO (1) NO317380B1 (de)
WO (1) WO2000001921A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004196626A (ja) 2002-12-20 2004-07-15 Sumitomo Chem Co Ltd 酸化チタンの製造方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2539047A (en) * 1946-06-17 1951-01-23 Arutunoff Armais Side drill
US2631821A (en) * 1952-02-28 1953-03-17 Joe P Caldwell Directional drilling device
FR2091931B1 (de) * 1970-05-15 1973-08-10 Petroles Cie Francaise
US4007797A (en) * 1974-06-04 1977-02-15 Texas Dynamatics, Inc. Device for drilling a hole in the side wall of a bore hole
US4640353A (en) * 1986-03-21 1987-02-03 Atlantic Richfield Company Electrode well and method of completion
US5687806A (en) * 1996-02-20 1997-11-18 Gas Research Institute Method and apparatus for drilling with a flexible shaft while using hydraulic assistance

Also Published As

Publication number Publication date
CA2336326A1 (en) 2000-01-13
CA2336326C (en) 2007-08-28
AR019187A1 (es) 2001-12-26
NO317380B1 (no) 2004-10-18
AU4781799A (en) 2000-01-24
AU751528B2 (en) 2002-08-22
WO2000001921A1 (en) 2000-01-13
DE69933564D1 (de) 2006-11-23
NO20006696D0 (no) 2000-12-29
DE69933564T2 (de) 2007-06-21
GC0000060A (en) 2004-06-30
NO20006696L (no) 2001-02-28
EP1092077A1 (de) 2001-04-18

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