EP1340881A1 - Verfahren und Vorrichtung zum explosiven Schneiden von Fenstern in Futterrohren - Google Patents

Verfahren und Vorrichtung zum explosiven Schneiden von Fenstern in Futterrohren Download PDF

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Publication number
EP1340881A1
EP1340881A1 EP02075823A EP02075823A EP1340881A1 EP 1340881 A1 EP1340881 A1 EP 1340881A1 EP 02075823 A EP02075823 A EP 02075823A EP 02075823 A EP02075823 A EP 02075823A EP 1340881 A1 EP1340881 A1 EP 1340881A1
Authority
EP
European Patent Office
Prior art keywords
window
explosive
housing
whipstock
cutting 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.)
Withdrawn
Application number
EP02075823A
Other languages
English (en)
French (fr)
Inventor
Anthony Thomas Cole
Klisthenis Dimitriadis
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 EP02075823A priority Critical patent/EP1340881A1/de
Publication of EP1340881A1 publication Critical patent/EP1340881A1/de
Withdrawn legal-status Critical Current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
    • 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
    • E21B29/02—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 by explosives or by thermal or chemical means

Definitions

  • the invention relates to a method and apparatus for cutting a window in a casing of a cased well, and for subsequently drilling a sidetrack from the well by inserting a sidetrack drilling device into the window and actuating the drilling device to drill a sidetrack into the formation adjacent to the window.
  • Such a method and device are known from US patent No. 5,636,692.
  • a whipstock is suspended from a window mill at the lower end of a drillstring and an explosive charge system is actuated to blast an opening into the well casing in the region between the whipstock and the window mill, whereupon the opening is reamed to the desired size of window by the milling device.
  • a disadvantage of the known method is that the blast opening has an irregular shape and that the window subsequently cut by the milling device also has irregular contours which are difficult to seal of when a liner is inserted into the side track and needs to be sealingly secured inside the window to provide a sealed well branchpoint.
  • the charges are either arranged between a whipstock and a milling device from which the whipstock is suspended, such that the whipstock subsequently mills away the casing fragments cut away by the explosive charges, or the casing fragments are first removed from the wellbore by a magnet or harpoon carried by the window milling device, whereupon a whipstock and sidetrack drilling assembly is subsequently run into the wellbore to drill a sidetrack through the window cut into the well casing.
  • the apparatus for initiating a side track from a cased wellbore in accordance with the invention comprises an explosive window cutting device for cutting a window in the well casing and a whipstock for guiding a side track drilling device through the window, wherein the explosive window cutting device is located in a housing which is located underneath the whipstock, which housing is adapted to store fragments of the well casing removed by the explosive window cutting device.
  • the apparatus preferably comprises one or more ring shaped explosive charges which each surround one or more magnets for pulling the removed fragments of the well casing into the housing and the explosive charges and/or at least one of the magnets are mounted on a carrier body that is movably arranged in the housing.
  • the method according to the invention for initiating a side track from a cased wellbore comprises inducing an explosive window cutting device to cut a window in the well casing and subsequently locating a whipstock in the wellbore adjacent to the window to guide a side track drilling device through the window, wherein the explosive window cutting device is located in a housing which is located underneath the whipstock, in which housing fragments of the well casing removed by the explosive window cutting device are stored.
  • the explosive window cutting device and/or one or more magnets for pulling the removed casing fragments into the housing are mounted on a carrier body, which is movably arranged in the housing, which body presses the ring shaped explosive charges against the inner surface of the casing when the window is cut and which is retracted into the housing after the window has been cut to pull the removed fragments of the well casing into the housing.
  • the explosive window cutting device and whipstock assembly is suspended from a drill string carrying a side track drill bit by means of a tool hanger which is mounted on top of the whipstock and which comprises a central opening which is wider than the outer diameter of a drill string but narrower than the outer diameter of a side track drill bit of the side track drilling device.
  • an assembly of expandable packers that are located above and below the housing is expanded when the explosive window-cutting device is actuated to isolate the wellbore in region of the housing from other parts of the wellbore during the explosion(s).
  • the assembly is equipped with axial and/or angular positioning sensors and that the window cutting device is positioned in a desired orientation in the wellbore by lowering the drill string to a predetermined depth into the wellbore and by subsequently rotating the drill string until the position sensors indicate that the window cutting device has a desired orientation for cutting the window and wherein after the window has been cut the drill string is lowered along a distance which corresponds to the distance between the centers of the whipstock and the housing whereupon the whipstock is locked within the casing such that the whipstock guides the side track drilling device into the window.
  • the whipstock is locked inside the casing by expanding the expandable packers.
  • FIG. 1 provides a schematic longitudinal sectional view of an explosive window cutting and sidetrack drilling apparatus according to the invention.
  • Fig. 1 depicts a wellbore 1 in which a steel well casing 2 is secured to the surrounding formation 3 by means of an annular body of cement 4.
  • An apparatus 5 for explosively cutting a window 6 in the well casing 2 and for subsequently drilling a sidetrack 7 into the formation 3 adjacent to the window 6 is suspended in the wellbore 1 from a drillstring 8 which carries at its lower end a sidetrack drill bit 9.
  • the upper end 10 of the apparatus 8 has an opening 11 which is wider than the drill string 8 but narrower than the sidetrack drill bit 9 such that said upper end 10 forms a hanger for suspending the apparatus from the drill string 8 when the assembly is lowered into the well.
  • the apparatus 5 further comprises a whipstock 12, a housing 13 that is mounted below the whipstock 12 and a wireless orientation sensing and control device 14.
  • the apparatus 5 also comprises an explosive window-cutting device 15 comprising one or more linear charges 16 and one or more magnets 17 that are mounted on a carrier arm 18.
  • the arm 18 pushes the charges 17 against the casing 2 when the charges 17 are fired to cut one or more fragments from the casing 2 such that a well defined window 20A is cut in the casing, and which arm is retracted after cutting the window 20A to pull the casing fragments 20B into the housing 13 by means of the magnets 17.
  • Expandable packers 21, 22 are mounted above and below the housing 13 to seal off wellbore in the region of the explosive window cutter 15 when the linear charges 16 are fired.
  • the packers 21,22 are retracted and the apparatus 5 is lowered into the wellbore 1 over a selected distance by further lowering the drillstring 8 into the wellbore 1 along a distance that corresponds to the distance between the center of the housing 13 and the center of the whipstock 12.
  • the packers 21 and 22 are expanded again to secure the whipstock 12 inside the casing 2. Subsequently the drill bit 9 is actuated to drill the sidetrack 7 and the drill string 8 and bit 9 are gradually lowered though the opening 11 to drill the sidetrack 7.

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  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
EP02075823A 2002-03-01 2002-03-01 Verfahren und Vorrichtung zum explosiven Schneiden von Fenstern in Futterrohren Withdrawn EP1340881A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP02075823A EP1340881A1 (de) 2002-03-01 2002-03-01 Verfahren und Vorrichtung zum explosiven Schneiden von Fenstern in Futterrohren

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP02075823A EP1340881A1 (de) 2002-03-01 2002-03-01 Verfahren und Vorrichtung zum explosiven Schneiden von Fenstern in Futterrohren

Publications (1)

Publication Number Publication Date
EP1340881A1 true EP1340881A1 (de) 2003-09-03

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ID=27675733

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02075823A Withdrawn EP1340881A1 (de) 2002-03-01 2002-03-01 Verfahren und Vorrichtung zum explosiven Schneiden von Fenstern in Futterrohren

Country Status (1)

Country Link
EP (1) EP1340881A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2403242B (en) * 2002-02-20 2006-09-13 Weatherford Lamb System for forming a window and drilling a sidetrack wellbore
WO2008118697A2 (en) * 2007-03-26 2008-10-02 Baker Hughes Incorporated Casing profiling and recovery system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5636692A (en) 1995-12-11 1997-06-10 Weatherford Enterra U.S., Inc. Casing window formation
WO1998005845A1 (en) * 1996-08-08 1998-02-12 Baker Hughes Incorporated Method for forming a casing window
EP0846838A2 (de) 1996-12-04 1998-06-10 Halliburton Energy Services, Inc. Verfahren und Vorrichtung zur Durchführung von Explosionsschneid-Operationen in einer Tiefbohrung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5636692A (en) 1995-12-11 1997-06-10 Weatherford Enterra U.S., Inc. Casing window formation
WO1998005845A1 (en) * 1996-08-08 1998-02-12 Baker Hughes Incorporated Method for forming a casing window
EP0846838A2 (de) 1996-12-04 1998-06-10 Halliburton Energy Services, Inc. Verfahren und Vorrichtung zur Durchführung von Explosionsschneid-Operationen in einer Tiefbohrung

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2403242B (en) * 2002-02-20 2006-09-13 Weatherford Lamb System for forming a window and drilling a sidetrack wellbore
WO2008118697A2 (en) * 2007-03-26 2008-10-02 Baker Hughes Incorporated Casing profiling and recovery system
WO2008118697A3 (en) * 2007-03-26 2008-11-20 Baker Hughes Inc Casing profiling and recovery system

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