EP0188343A2 - Stabilisator - Google Patents

Stabilisator Download PDF

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Publication number
EP0188343A2
EP0188343A2 EP86300163A EP86300163A EP0188343A2 EP 0188343 A2 EP0188343 A2 EP 0188343A2 EP 86300163 A EP86300163 A EP 86300163A EP 86300163 A EP86300163 A EP 86300163A EP 0188343 A2 EP0188343 A2 EP 0188343A2
Authority
EP
European Patent Office
Prior art keywords
cap
tool
shank
leading end
flutes
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Withdrawn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
EP86300163A
Other languages
English (en)
French (fr)
Other versions
EP0188343A3 (de
Inventor
Arthur Stewart
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.)
Stable Services Ltd
Original Assignee
Stable Services Ltd
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 Stable Services Ltd filed Critical Stable Services Ltd
Publication of EP0188343A2 publication Critical patent/EP0188343A2/de
Publication of EP0188343A3 publication Critical patent/EP0188343A3/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Withdrawn legal-status Critical Current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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
    • E21B17/1078—Stabilisers or centralisers for casing, tubing or drill pipes
    • 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
    • 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
    • E21B10/62—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable
    • 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/22—Rods or pipes with helical structure
    • 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
    • E21B47/00—Survey of boreholes or wells
    • E21B47/02—Determining slope or direction
    • E21B47/022—Determining slope or direction of the borehole, e.g. using geomagnetism

Definitions

  • This invention relates to rock drilling and more particularly, to a stabilising tool for connection in a drill string behind a drilling collar carrying a drill bit.
  • Such stabilising tools which are typically 6 - 8ft. in length, are expensive both to manufacture and refurbish, refurbishment often being necessary since a worn drill bit tends to leave debris which cannot be broken down and transported past the stabiliser with the result that the stabiliser tends to wear badly.
  • the string has to be retracted and broken down and the usual spiral stabiliser replaced by a special roller-reamer tool in order to ream the bore before drilling can continue.
  • directional drilling As is often the case from an oil rig, the precise location of the drill bit needs to be monitored. To do this magnetic probes are introduced through the drill string into the stabiliser and so as to avoid interference with readings taken, a stabiliser of non-magnetic material must be used. For normal drilling a cheaper steel stabiliser is used.
  • U.S. 3 642 079, U.S. 3 933 395 and GB-A-2133059 all disclose stabilisers in which the entire fluted stabiliser portion is removably secured to the shank. Such stabilisers are not however, widely used in practice.
  • the stabiliser portion is formed in two parts which are secured on the shank by threads of opposite hand.
  • One disadvantage of such an arrangement is the tendency for the upper part to work loose and "back-off" . If the drill string jamsso necessitating the use a power jar to reverse the string, too much torque is applied to the lower part resulting in stripping of the mounting threads.
  • One object of the present invention is at least to mitigate the disadvantages set out above.
  • a stabilising tool for connection in a drill string and having a shank adapted for connection by its ends in the drill string and a fluted stabilising portion comprising a body part integral with the shank and a leading end part or cap which is removably secured to the shank.
  • a stabiliser tool set comprising a stabilising tool having a shank adapted for connection by its ends in a drill string, in combination with a plurality of a plurality of interchangeable stabiliser tool caps each being adapted to be removably secured to the shank so as to form the leading end part of a fluted stabiliser portion the remainder or body part of which is integral with the shank.
  • Both the body part and the cap are fluted, such that the flutes thereof are in alignment with the interface when the cap is secured in position.
  • the body part preferably has spiral fluting but the cap may have either spiral flutes intended for normal stabilising operation, straight flutes enabling the assembled tool to be used as a reamer when drilling rough and abrasive rock formations.
  • the stabiliser functioning in the well is controlled by the well structure, i.e. abrasive sand, very hard rock and also bit performance.
  • a bit going below gauge too quickly can virtually wipe the entire string of stabilisers facing out, therefore, leading to the undercutting of bodies and blades rendering the tool useless.
  • the present invention enables the driller to assess the damage done to the stabiliser and if required to fit a mill or a reamer without fully breaking the string or have to keep the bulky stabilisers on the drill floor restricting workspace. He can then carry out drilling again but with a tool fit to cut out any blockage that has been damaging other equipment.
  • the stabiliser tool has a shank or body ( Figures 1 and 2) 10 adapted at each end for connection in a drill string, the leading end 12 being connected in use to a drill collar (not shown) which carries the drill bit.
  • a stabilising portion 14 has a nominal diameter slightly smaller than the diameter of the drill bit and is formed with flutes through which debris is transported upwardly past the stabiliser.
  • the stabilising portion is in two parts; a body part 16 integral with the shank 10 and a removable * sleeve or cap 18 having an internal tapered thread 19, which is screwed onto a tapered external thread 11 on the shank 10 and clamped tightly in abutment with a shoulder 20 at the leading end of the body part 16.
  • the body part 16 has spiral flutes 22 typically forming three cutting blades, but the cap 18 may have spiral flutes as shown in Figures 1 to 3 or straight flutes 23 as shown in Figures 4 and 5.
  • the body part 16 and cap 18 have the same number of flutes of the same size and shape such that the flutes in the two parts of the stabilising portion are aligned at the interface when the cap 18 is secured in position.
  • the stabilising tool may be adapted for normal drilling, to act as a reamer by fitting the straight-fluted cap of Figure 4 or for use in milling by fitting the straight-fluted tapered cap shown in Figure 5, when required for example, during drilling through very rough or abrasive rock formations.
  • the cap 18 constitutes the leading end of the stabilising portion 14 with the result that cutting edges on the cap, which are dressed with diamonds or cutting carbides, will wear first. When the cap wears away it can be unscrewed and replaced from a stock of caps on the rig. Only the cap needs to be sent away for refurbishing.
  • FIGS 2, 4, and 5 in combination show a multi-purpose stabilising tool set in accordance with the invention.
  • the stabilising tool can be used as required for normal drilling, reaming or milling.
  • Typical dimensions for a range of stabilising tools are set out in the drawings and the composition of materials suitable for both non-magnetic and steel stabilising tools are set out below.

Landscapes

  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (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)
  • Geophysics (AREA)
  • Food-Manufacturing Devices (AREA)
  • Laminated Bodies (AREA)
  • Earth Drilling (AREA)
EP86300163A 1985-01-18 1986-01-13 Stabilisator Withdrawn EP0188343A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB858501256A GB8501256D0 (en) 1985-01-18 1985-01-18 Stabilizing tool
GB8501256 1985-01-18

Publications (2)

Publication Number Publication Date
EP0188343A2 true EP0188343A2 (de) 1986-07-23
EP0188343A3 EP0188343A3 (de) 1987-08-05

Family

ID=10573030

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86300163A Withdrawn EP0188343A3 (de) 1985-01-18 1986-01-13 Stabilisator

Country Status (6)

Country Link
EP (1) EP0188343A3 (de)
DK (1) DK22186A (de)
ES (1) ES296679Y (de)
FI (1) FI860237L (de)
GB (1) GB8501256D0 (de)
NO (1) NO860143L (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0392755A1 (de) * 1989-04-10 1990-10-17 Smith International, Inc. Fräswerkzeug, kombiniert mit einem Stabilisator
GB2252578A (en) * 1991-01-29 1992-08-12 Stable Services Ltd Stabilising tool
WO2016100497A1 (en) * 2014-12-16 2016-06-23 Sumrall Ernest Newton Borehole conditioning tools

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2483631A (en) * 1945-10-12 1949-10-04 Charles J Fashing Small game suspending device

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3642079A (en) * 1970-06-23 1972-02-15 Servco Co Multisleeve stabilizer
US3825083A (en) * 1972-02-02 1974-07-23 Christensen Diamond Prod Co Drill bit and stabilizer combination
US3933395A (en) * 1973-12-13 1976-01-20 Reamco, Inc. Stabilizer
US4380264A (en) * 1980-12-24 1983-04-19 Drilling Development, Inc. Survey tool string
GB2133059B (en) * 1982-11-24 1986-01-15 Groom International Limited Drilling tools
GB2166177A (en) * 1984-10-26 1986-04-30 Metal X Corp Of Texas Sleeve-type stabilizer

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0392755A1 (de) * 1989-04-10 1990-10-17 Smith International, Inc. Fräswerkzeug, kombiniert mit einem Stabilisator
GB2252578A (en) * 1991-01-29 1992-08-12 Stable Services Ltd Stabilising tool
GB2252578B (en) * 1991-01-29 1994-09-28 Stable Services Ltd Stabilising tool
WO2016100497A1 (en) * 2014-12-16 2016-06-23 Sumrall Ernest Newton Borehole conditioning tools
US10337266B2 (en) 2014-12-16 2019-07-02 Ernest Newton Sumrall Borehole conditioning tools
US10738547B2 (en) 2014-12-16 2020-08-11 Ernest Newton Sumrall Borehole conditioning tools

Also Published As

Publication number Publication date
DK22186D0 (da) 1986-01-17
DK22186A (da) 1986-07-19
EP0188343A3 (de) 1987-08-05
ES296679U (es) 1987-12-16
FI860237A0 (fi) 1986-01-17
ES296679Y (es) 1988-05-16
FI860237A7 (fi) 1986-07-19
FI860237L (fi) 1986-07-19
GB8501256D0 (en) 1985-02-20
NO860143L (no) 1986-07-21

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Inventor name: STEWART, ARTHUR