EP0353962A2 - Futterrohrschneider - Google Patents

Futterrohrschneider Download PDF

Info

Publication number
EP0353962A2
EP0353962A2 EP89307720A EP89307720A EP0353962A2 EP 0353962 A2 EP0353962 A2 EP 0353962A2 EP 89307720 A EP89307720 A EP 89307720A EP 89307720 A EP89307720 A EP 89307720A EP 0353962 A2 EP0353962 A2 EP 0353962A2
Authority
EP
European Patent Office
Prior art keywords
cutter
casing
arm
cutting edge
milling
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Withdrawn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
EP89307720A
Other languages
English (en)
French (fr)
Other versions
EP0353962A3 (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
Tri State Oil Tools Inc
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
Priority claimed from GB888818216A external-priority patent/GB8818216D0/en
Priority claimed from GB888821326A external-priority patent/GB8821326D0/en
Application filed by Tri State Oil Tool UK Ltd, Tri State Oil Tools Inc filed Critical Tri State Oil Tool UK Ltd
Publication of EP0353962A2 publication Critical patent/EP0353962A2/de
Publication of EP0353962A3 publication Critical patent/EP0353962A3/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Withdrawn legal-status Critical Current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
    • E21B29/002—Cutting, e.g. milling, a pipe with a cutter rotating along the circumference of the pipe
    • E21B29/005—Cutting, e.g. milling, a pipe with a cutter rotating along the circumference of the pipe with a radially-expansible cutter rotating inside the pipe, e.g. for cutting an annular window
    • 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

Definitions

  • This invention relates to casing cutters.
  • Hydrocarbon wells are commonly lined with steel tubing known as casing.
  • Casing normally has one of a number of standardised internal diameters. At any given depth in a lined hydrocarbon well, there may be a single casing, or two or more concentrically nested casings of different diameters. On occasion, it may be necessary to sever installed casing, for example to enable its removal from the well. Cutters have been developed in the form of a tool rotated by a string to cut casing by milling action. Such a tool consists of three arms which can be pivoted outwards (like umbrella ribs) under the control of mud pressure in the string, so as to bear against the casing.
  • the arms are coated with particles of tungsten carbide (secured by brazing), and mill through the casing as the tool is rotated by turning the string.
  • tungsten carbide secured by brazing
  • This procedure provides fresh cutting edges for each casing, but at the economic cost of having to trip between the successive cuttings of the concentric casings, and of also having to provide a set of new milling arms (or a complete replacement tool) for each casing. It is therefore an object of the invention to provide a casing cutter which obviates or mitigates these disadvantages.
  • a casing cutter of the type comprising at least one milling arm which in use pivots outwards of the cutter about a pivot axis to trace a substantially conical path during rotation of the cutter about a rotation axis, the cone angle of the conical path with respect to the rotation axis increasing with increasing diameter of a casing being cut in use of the cutter, the or each milling arm having a plurality of effective cutting edges each having a respective offset with respect to a notional axial reference line of the arm which passes through the respective pivot axis of that arm, the offset of each effective cutting edge being a distinct combination of circumferential offset and radial offset from the respective notional axial reference line whereby a different effective cutting edge is presented to each casing when the cutter is in use to cut a plurality of concentric casings of different diameters.
  • Each effective cutting edge may be a substantially continuous cutting edge, or each effective cutting edge may comprise a relatively large number of relatively small individual cutters mounted in a row to present respective individual cutting edges which collectively form the effective cutting edge.
  • the effective cutting edge may be substantially linear.
  • the casing cutter preferably has three milling arms which are preferably symmetrically arranged on the cutter.
  • the pivot axes of the milling arms are preferably each tangential to a common circle co-axial with the rotation axis of the cutter.
  • the cutter may contain a piston which is axially movable in response to hydraulic pressure within a string of which the cutter forms part in use of the cutter, the piston linking with each milling arm such that axial movement of the piston in one direction forces each milling arm to pivot outwards in concert.
  • the notional axial reference line of each arm will not only pass through the respective pivot axis, but can also be selected to pass through the rotation axis of the cutter by being positioned to be coincident with the point of tangency of the pivot axis with the common circle.
  • the reference lines of each arm will coincide on the rotation axis if each arm is pivoted outwardly of the cutter by an equal angle.
  • the effective cutting edges of each arm are preferably each parallel but otherwise asymmetrical whereby the respective offset of each effective cutting edge on a given arm has the requisite distinction from the offset of each other effective cutting edge on that arm.
  • a milling arm for adapting a casing cutter to form a casing cutter in accordance with the first aspect of the invention, the milling arm being as defined in any of the preceding paragraphs relating to the first aspect of the invention.
  • the first form of milling arm 10 in accordance with the invention comprises a body 12 which incorporates and extends radially away from an integral pivot bore 14.
  • the arm 10 also integrally incorporates a spur-like heel 16 which extends generally away from the body 12.
  • it will be mounted (in a symmetrical array along with (usually) two other identical such arms) on a respective pivot pin (not shown) passing through the pivot bore 14 on a pivot axis which is tangential to a circle centered on the rotational axis of the cutter as a whole.
  • the heel 16 will lie inboard of the pivot bore 14 (radially inwards in the cutter) when the body 12 is fully retracted into the cutter to lie with its long axis generally parallel to the rotation axis of the cutter, and downward of the pivot bore 14.
  • the outer face of the body 12 carries two rows 18 and 20 of tungsten carbide "buttons" or frusto-conical inserts 22.
  • Each of the rows 18 and 20 is formed by a respective channel milled longitudinally in the outer face of the body 12 (see especially the lower end view in Fig. 3).
  • the inserts 22 are secured in the respective channels to the body 12 by brazing.
  • each individual insert 22 presents only part of its larger circular edge as a cutting edge in use of the milling arm 10, the inserts 22 in each of the rows 18 and 20 collectively form a respective cutting edge which is substantially a straight line in its effect (analogous to the manner in which the variously profiled and set teeth of a hacksaw blade together form an effectively straight cutting edge).
  • the rows 18 and 20 are asymmetrically arrayed on the body 12 (see especially Figs. 2 and 3).
  • a hypothetical reference line running along the length of the body 12 through the middle of its transverse section and selected so as to intersect the axis of the pivot bore 14 at right angles, it will be seen that the two effective cutting edges formed by the rows 18 and 20 of carbide buttons 22 are each parallel to this selected reference line, but with different offsets from the selected reference line.
  • the effective cutting edge formed by the row 18 see Fig.
  • the placement of the rows 18 and 20 on the milling arm 10 can be designed so that the changeover between instantaneously effective cutting edges occurs at an arm pivot angle corresponding to a diameter intermediate standard casing diameters, as is schematically illustrated in Fig. 1.
  • Such a placement of the rows 18 and 20 will result in only one effective cutting edge being presented to cut an inner casing of two concentric casings, with a changeover to the other and hitherto unused effective cutting edge when cutting the outer casing of the two concentric casings. This results in improved cutting efficiency, and faster cutting of multiple casing. (These advantages are at least partially retained even if the nested and nominally concentric casings are in fact substantially eccentric).
  • the outboard end of the body 12 (remote from the pivot bore 14) can be coated with a brazed-on layer 28 of tungsten carbide particles.
  • the inventive principle of providing the milling arms with multiple cutting edges so arranged that a different cutting edge presents to each casing of a different diameter can be extended from the two-edges form of milling arm shown in Figs. 1 to 3 to a three-edges form of milling arm as shown in Figs. 4, 5, and 6.
  • the three-edged form of milling arm differs fundamentally from the two-edged form only in that three rows of tungsten carbide inserts are brazed into respective channels in the outer face of the milling arm.
  • the channels are differently offset such that the three effective cutting edges present in turn to casings of three different diameters, as shown in Fig. 6.
  • Fig. 7 is a half-sectioned longitudinal view of a known form of casing cutter, being the multi-string cutter of Tri-State Oil Tool Industries Inc. as described in their Manual No. 7008 of April 1985.
  • This multi-string cutter has three so-­called "knifes" 30 which are pivoting arms whose outer edges are coated with a layer of brazed-on tungsten carbide particles.
  • each of the three knifes of the cutter is replaced by a milling arm, either as described above in Figs. 1 to 3 or in Figs. 4 to 6, or designed in accordance with the principles described above.
  • the milling arms in accordance with the invention can be manufactured by simple, standard procedures, and the casing cutters in accordance with the invention can be provided by a simple adaptation of existing casing cutters.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (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)
  • Milling Processes (AREA)
EP19890307720 1988-07-30 1989-07-28 Futterrohrschneider Withdrawn EP0353962A3 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB888818216A GB8818216D0 (en) 1988-07-30 1988-07-30 Casing cutter
GB8818216 1988-07-30
GB888821326A GB8821326D0 (en) 1988-09-12 1988-09-12 Casing cutters
GB8821326 1988-09-12

Publications (2)

Publication Number Publication Date
EP0353962A2 true EP0353962A2 (de) 1990-02-07
EP0353962A3 EP0353962A3 (de) 1991-03-27

Family

ID=26294221

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890307720 Withdrawn EP0353962A3 (de) 1988-07-30 1989-07-28 Futterrohrschneider

Country Status (2)

Country Link
EP (1) EP0353962A3 (de)
NO (1) NO893075L (de)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5124338A (en) * 1989-06-19 1992-06-23 Burroughs Wellcome Company Agents for potentiating the effects of antitumor agents and combating multiple drug resistance
US5124330A (en) * 1989-06-19 1992-06-23 Burroughs Wellcome Company (E)-ethyl 3-(4-chloro-α-(4-methyl-1-piperazinyl)benzyl)cinnamate used for potentiating the effects of antitumor agents and combating multiple drug resistance
GB2262711A (en) * 1991-12-27 1993-06-30 Hailey Charles D Cutter blades for rotary tubing tools
US5300282A (en) * 1989-06-19 1994-04-05 Burroughs-Wellcome Company Agents for potentiating the effects of antitumor agents and combating multiple drug resistance
EP0631646A4 (de) * 1992-03-25 1996-04-17 Atlantic Richfield Co Vorrichtung und verfahren zum schneiden und fräsen von rohren im bohrloch.
WO1997011250A1 (en) * 1995-09-22 1997-03-27 Weatherford/Lamb, Inc. Milling apparatus
RU2110665C1 (ru) * 1996-05-06 1998-05-10 Туймазинское управление буровых работ Устройство для вырезания участка колонны труб в скважине
US5762143A (en) * 1996-05-29 1998-06-09 Baroid Technology, Inc. System and method for placement and retrieval of a subsurface diverting tool used in drilling and completing wells
US5778980A (en) * 1996-05-29 1998-07-14 Baroid Technology, Inc. Multicut casing window mill and method for forming a casing window
RU2201493C2 (ru) * 2001-05-28 2003-03-27 Открытое акционерное общество "Акционерная нефтяная компания "Башнефть" Вырезающее устройство
GB2486898A (en) * 2010-12-29 2012-07-04 Nov Downhole Eurasia Ltd A downhole tool with at least one extendable offset cutting member for reaming a bore
WO2016172500A1 (en) * 2015-04-24 2016-10-27 Weatherford Technology Holdings, Llc Tubular cutting tool

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1801482A (en) * 1925-10-27 1931-04-21 Boynton Alexander Milling tool
US2859943A (en) * 1957-01-07 1958-11-11 Chadderdon Jack Expansible mill for well casings
GB872547A (en) * 1957-04-01 1961-07-12 Joy Mfg Co Rotary cutting device
US4646826A (en) * 1985-07-29 1987-03-03 A-Z International Tool Company Well string cutting apparatus
US4796709A (en) * 1986-01-06 1989-01-10 Tri-State Oil Tool Industries, Inc. Milling tool for cutting well casing
US4887668A (en) * 1986-01-06 1989-12-19 Tri-State Oil Tool Industries, Inc. Cutting tool for cutting well casing

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5124330A (en) * 1989-06-19 1992-06-23 Burroughs Wellcome Company (E)-ethyl 3-(4-chloro-α-(4-methyl-1-piperazinyl)benzyl)cinnamate used for potentiating the effects of antitumor agents and combating multiple drug resistance
US5300282A (en) * 1989-06-19 1994-04-05 Burroughs-Wellcome Company Agents for potentiating the effects of antitumor agents and combating multiple drug resistance
US5124338A (en) * 1989-06-19 1992-06-23 Burroughs Wellcome Company Agents for potentiating the effects of antitumor agents and combating multiple drug resistance
GB2262711A (en) * 1991-12-27 1993-06-30 Hailey Charles D Cutter blades for rotary tubing tools
GB2262711B (en) * 1991-12-27 1994-12-14 Hailey Charles D Cutter blades for rotary tubing tools
EP0631646A4 (de) * 1992-03-25 1996-04-17 Atlantic Richfield Co Vorrichtung und verfahren zum schneiden und fräsen von rohren im bohrloch.
US5862870A (en) * 1995-09-22 1999-01-26 Weatherford/Lamb, Inc. Wellbore section milling
WO1997011250A1 (en) * 1995-09-22 1997-03-27 Weatherford/Lamb, Inc. Milling apparatus
RU2110665C1 (ru) * 1996-05-06 1998-05-10 Туймазинское управление буровых работ Устройство для вырезания участка колонны труб в скважине
US5762143A (en) * 1996-05-29 1998-06-09 Baroid Technology, Inc. System and method for placement and retrieval of a subsurface diverting tool used in drilling and completing wells
US5778980A (en) * 1996-05-29 1998-07-14 Baroid Technology, Inc. Multicut casing window mill and method for forming a casing window
RU2201493C2 (ru) * 2001-05-28 2003-03-27 Открытое акционерное общество "Акционерная нефтяная компания "Башнефть" Вырезающее устройство
GB2486898A (en) * 2010-12-29 2012-07-04 Nov Downhole Eurasia Ltd A downhole tool with at least one extendable offset cutting member for reaming a bore
US9689209B2 (en) 2010-12-29 2017-06-27 Nov Downhole Eurasia Limited Large gauge concentric underreamer
WO2016172500A1 (en) * 2015-04-24 2016-10-27 Weatherford Technology Holdings, Llc Tubular cutting tool
US10370921B2 (en) 2015-04-24 2019-08-06 Weatherford Technology Holdings, Llc Tubular cutting tool
EP3736406A1 (de) * 2015-04-24 2020-11-11 Weatherford Technology Holdings, LLC Rohrschneidewerkzeug
US11041353B2 (en) 2015-04-24 2021-06-22 Weatherford Technology Holdings, Llc Tubular cutting tool

Also Published As

Publication number Publication date
NO893075D0 (no) 1989-07-28
NO893075L (no) 1990-01-31
EP0353962A3 (de) 1991-03-27

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