EP0298663A2 - Schneidwerkzeug im Bohrloch - Google Patents

Schneidwerkzeug im Bohrloch Download PDF

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Publication number
EP0298663A2
EP0298663A2 EP88305962A EP88305962A EP0298663A2 EP 0298663 A2 EP0298663 A2 EP 0298663A2 EP 88305962 A EP88305962 A EP 88305962A EP 88305962 A EP88305962 A EP 88305962A EP 0298663 A2 EP0298663 A2 EP 0298663A2
Authority
EP
European Patent Office
Prior art keywords
arm
body part
cutting
face
extended position
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Withdrawn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
EP88305962A
Other languages
English (en)
French (fr)
Other versions
EP0298663A3 (de
Inventor
Thomas Doig
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.)
Tri State Oil Tool UK Ltd
Original Assignee
Tri State Oil Tool UK Ltd
Tri State Oil Tools Inc
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 Tri State Oil Tool UK Ltd, Tri State Oil Tools Inc filed Critical Tri State Oil Tool UK Ltd
Publication of EP0298663A2 publication Critical patent/EP0298663A2/de
Publication of EP0298663A3 publication Critical patent/EP0298663A3/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Withdrawn legal-status Critical Current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
    • E21B37/00—Methods or apparatus for cleaning boreholes or wells
    • E21B37/02—Scrapers specially adapted therefor
    • 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
    • E21B10/00—Drill bits
    • E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
    • E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
    • E21B10/322—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools cutter shifted by fluid pressure
    • 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
    • E21B37/02—Scrapers specially adapted therefor
    • E21B37/04—Scrapers specially adapted therefor operated by fluid pressure, e.g. free-piston scrapers

Definitions

  • This invention relates to a downhole cutting tool particularly, but not exclusively, in the form of an underreamer for use in descaling pipes downhole in an oil well.
  • One aspect of the present invention provides a downhole cutting tool comprising a body, at least one operating arm pivotally mounted on the body about an axis perpendicular to the longitudinal axis of the body for pivotal movement between a retracted position substantially within the body and an extended position projecting from the body, arm extension means for selectively driving the arm from the retracted to the extended position, and mechanical locking means arranged to lock the arm in the extended position during operation with weight on bit.
  • an underreamer for use in descaling pipes comprising a body, an operating arm pivotally mounted on said body about an axis perpendicular to the longitudinal axis of the body for pivotal extension from the body, the arm having a leading edge having cutting means adapted for descaling a surface on rotation of the body and having a stabiliser arranged at an angle to the leading edge such that the stabiliser engages the surface at a predetermined extension of the arm to prevent the cutting means cutting the surface.
  • the underreamer comprises an upper body 10 which is telescopically received within a lower body 12.
  • the upper body 10 and lower body 12 are provided with pin and box connectors 14 and 16 respectively for connection in a drill string.
  • a through bore 18 is provided for passage of drilling mud.
  • a coil spring 20 trapped between facing shoulders on the upper body 10 and lower body 12 biases these parts outwardly.
  • the underreamer is provided with three cutting arms, one of which is seen at 22 in Fig. 1 (the others being identical and spaced at 120° intervals).
  • the arm 22 is mounted to the lower body 12 by pivot 24 for movement between a retracted position shown chain-dotted and an extended position shown full-line.
  • the underreamer is included in the drill string and pased downhole with the arms 22 retracted.
  • the mud pump is started to pressurise mud through the drill string.
  • the bore 18 is formed with a restriction 26 on which a force is exerted by the pressurised mud to urge the upper body 10 inwardly of the lower body 12 against the bias of spring 20.
  • an external flange 28 on the upper body 10 cams against a curved inner face 29 on the arm 22, driving the arm 22 into the extended position.
  • the inward relative movement of the upper body 10 is limited by contact of a resilient buffer 30 carried thereby with a shoulder 32 on the lower body 12.
  • the arm 22 is mechanically locked in the extended position by mating of faces 34 and 36 on the flange 28 and arm 22 respectively.
  • the underreamer is then maintained in this condition by either or both of mud pump pressure and weight on bit during descaling.
  • a notch 38 (Fig. 3) formed on the base of the arm 22 is engaged by a stud (not seen in the drawings) on the upper body as it returns to its rest position to provide a positive retraction force.
  • the arm 22 is shown retracted at B and extended at C.
  • the arm 22 has a first cutting surface 40 which forms a leading surface in the circumferential direction, and a second cutting surface 42 which forms a leading surface in the axial direction.
  • a further surface 44 forms a stabilising pad.
  • the operation is as follows.
  • the underreamer is brought to the desired location, the mud pump is brought into operation to begin extension of the arms 22 as described, and the tool is rotated.
  • the cutting surfaces 40 engage scale lining the wellbore casing 46 and cut into the scale as the arms extend.
  • the stabilising pads 44 engage the interior surface of the casing 46 as shown at C in Fig. 3. This prevents the arms 22 from opening further and thus the cutting surfaces 40 are prevented from cutting into the casing 46.
  • the engagement of the arms 22 with the casing 46 via the stabilising pads 44 also centralises the underreamer in the bore, and subsequent movement of the underreamer down the bore causes the second cutting surfaces 42 on the leading faces of the arms 22 to mill away the scale lining the casing.
  • the descaling operation can thus be performed without damaging the pipe forming the casing.
  • the underreamer illustrated has a 2 7/8" (73 mm) outer diameter body in which the arms open to 5 1/2" (140 mm). However, the arms can be adjusted to open further and still collapse flush with the body by adjusting the angle of the leading face of the arm.
  • the stabilising pad 44 is parallel with the bore in which the arm 22 is cutting when the arm is full open.
  • the second cutting surface 42 has a slight negative angle of 3° which assists the arm to open out.
  • the tool may be rotated by a downhole motor.
  • a procedure for determining when the arms are actually locked out has been developed since, unlike conventional underreaming, the pumps cannot be switched off and testing carried out for drilling weight as the motor would stop rotating.
  • the system is as follows:
  • the tool may be rotated by rotating the drill string at the surface.
  • the invention may also be used in other applications where a downhole cutting tool must be passed beyond a bore restriction and then deployed to an extended position, for example a tool for cutting casing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)
EP88305962A 1987-07-08 1988-06-29 Schneidwerkzeug im Bohrloch Withdrawn EP0298663A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB878716040A GB8716040D0 (en) 1987-07-08 1987-07-08 Underreamer for descaling
GB8716040 1987-07-08

Publications (2)

Publication Number Publication Date
EP0298663A2 true EP0298663A2 (de) 1989-01-11
EP0298663A3 EP0298663A3 (de) 1990-01-03

Family

ID=10620289

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88305962A Withdrawn EP0298663A3 (de) 1987-07-08 1988-06-29 Schneidwerkzeug im Bohrloch

Country Status (3)

Country Link
EP (1) EP0298663A3 (de)
GB (1) GB8716040D0 (de)
NO (1) NO883016L (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997047849A1 (en) * 1996-06-10 1997-12-18 Weatherford/Lamb, Inc. Cutting tool for use in a wellbore
WO2001000961A1 (en) * 1999-06-24 2001-01-04 Bjoernstad Thor An underreamer and a method of using the underreamer
WO2001066907A1 (en) * 2000-03-10 2001-09-13 Nortech Systems Limited Clean out tool
CN104653154A (zh) * 2015-02-25 2015-05-27 中国石油天然气股份有限公司 通井刮削一体化工具
DK179304B1 (en) * 2014-03-11 2018-04-23 Qinterra Tech As Tool for internal cleaning of a tubing or casing
CN110500062A (zh) * 2018-05-17 2019-11-26 中国石油天然气股份有限公司 一种旋转定径规

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2756968A (en) * 1954-04-12 1956-07-31 Grant Oil Tool Company Expansible well scraper
US2823901A (en) * 1955-11-07 1958-02-18 Kammerer Jr Archer W Expansible rotary drilling tools
US3196960A (en) * 1963-03-19 1965-07-27 Lamphere Jean K Fluid pressure expansible drill bits
US4565252A (en) * 1984-03-08 1986-01-21 Lor, Inc. Borehole operating tool with fluid circulation through arms

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997047849A1 (en) * 1996-06-10 1997-12-18 Weatherford/Lamb, Inc. Cutting tool for use in a wellbore
AU710317B2 (en) * 1996-06-10 1999-09-16 Weatherford/Lamb Inc. Cutting tool for use in a wellbore
WO2001000961A1 (en) * 1999-06-24 2001-01-04 Bjoernstad Thor An underreamer and a method of using the underreamer
WO2001066907A1 (en) * 2000-03-10 2001-09-13 Nortech Systems Limited Clean out tool
DK179304B1 (en) * 2014-03-11 2018-04-23 Qinterra Tech As Tool for internal cleaning of a tubing or casing
US10273783B2 (en) 2014-03-11 2019-04-30 Qinterra Technologies As Tool for internal cleaning of a tubing or casing
CN104653154A (zh) * 2015-02-25 2015-05-27 中国石油天然气股份有限公司 通井刮削一体化工具
CN104653154B (zh) * 2015-02-25 2017-06-13 中国石油天然气股份有限公司 通井刮削一体化工具
CN110500062A (zh) * 2018-05-17 2019-11-26 中国石油天然气股份有限公司 一种旋转定径规

Also Published As

Publication number Publication date
EP0298663A3 (de) 1990-01-03
NO883016L (no) 1989-01-09
NO883016D0 (no) 1988-07-06
GB8716040D0 (en) 1987-08-12

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