EP0028121A1 - Trépans alésoirs - Google Patents

Trépans alésoirs Download PDF

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Publication number
EP0028121A1
EP0028121A1 EP80303725A EP80303725A EP0028121A1 EP 0028121 A1 EP0028121 A1 EP 0028121A1 EP 80303725 A EP80303725 A EP 80303725A EP 80303725 A EP80303725 A EP 80303725A EP 0028121 A1 EP0028121 A1 EP 0028121A1
Authority
EP
European Patent Office
Prior art keywords
shearer
sub member
plungers
locking means
casing
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Withdrawn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
EP80303725A
Other languages
German (de)
English (en)
Inventor
Frederick Fletcher
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.)
Smithurst Hilda May
Original Assignee
Smithurst Hilda May
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 Smithurst Hilda May filed Critical Smithurst Hilda May
Publication of EP0028121A1 publication Critical patent/EP0028121A1/fr
Withdrawn legal-status Critical Current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
    • E21B10/00—Drill bits
    • E21B10/64—Drill bits characterised by the whole or part thereof being insertable into or removable from the borehole without withdrawing the drilling pipe
    • 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
    • E21B10/003—Drill bits with cutting edges facing in opposite axial directions
    • 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
    • E21B17/14—Casing shoes for the protection of the bottom of the casing
    • 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
    • E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes

Definitions

  • the present invention relates to a downhole casing. shearer for use, for example, in the exploration, mining, water well and construction industries.
  • Known downhole shearers comprise a drilling bit connected to the end region of an elongate rod string which serves to drive the drilling bit. Rotation of the rod string rotates the drilling bit and causes . the required hole to be drilled. As the hole is drilled deeper the length of the rod string is increased by connecting extra rod string sections to the existing rod string, as required.
  • Drilling can be and is to as deep as several hundred metres and thus different types of strata have usually to be drilled through.
  • Certain strata can be hostile insofar as they consist of overburdened formations which tend to close off the hole once the drilling bit has passed therethrough.
  • the rod string and drilling bit are retracted and a cylindrical casing liner is inserted into the hole.
  • difficulties can arise especially in the case of overburdened strata, both whilst retracting the rod string and drilling bit, and whilst inserting the liner, the overburdened strata having to be drilled away.
  • the aim of the present invention is to provide a downhole casing shearer which enables the drilling bit to be easily retracted when required, and the casing liner to be easily inserted into the hole.
  • a downhole casing shearer comprising a sub member and a hollow cylindrical shearer, the sub member being adapted to be connected between a drilling bit and a drilling rod string and being insertable at least partially within the shearer, releasable locking means being provided on the sub member for locking the sub member and shearer together to prevent relative rotational movement, one end region of the shearer being connectible to a cylindrical casing liner for lining the bore in which the casing shearer is used.
  • the sub member is a generally cylindrical elongate member which is a snug, though slidable fit within the cylindrical shearer i.e. the external diameter of the sub member is slightly smaller than the internal diameter of the shearer.
  • One end of the sub member can be screwed to the end of a section of drilling rod string and the other end of the sub member can be screwed to a drilling bit.
  • the sub member is preferably made of high quality drill collar steel and has a central,axially extending through bore via which fluid for cooling purposes and for conveying away cut material, can be passed during drilling.
  • the said locking means comprise a pair of plungers which are retained in recesses in the sub member and which are spring biassed by coiled compression springs within the respective recesses, towards a position in which they project from the side wall of the sub member.
  • the plungers are diametrically opposed with respect to the generally cylindrical sub member and can engage in oomplimentary ports or apertures in the wall of the cylindrical shearer to thus prevent relative rotation therebetween.
  • suitable recesses in the inner wall of the shearer may replace the said ports.
  • the plungers are preferably cylindrical though planar plungers or plungers of any other suitable configuration may be used, and each plunger is provided with a chamfered surface so that axial movement of the sub member relative to the shearer in one direction, will cause the plungers to retract into their respective recesses.
  • the said one end region of the shearer is provided both with rotational and thrust bearings for use in connecting the shearer to a conventional casing liner, and with cutting teeth or a hardened surface for reasons later discussed.
  • the other end region of the shearer which is, in use, nearest the drilling bit, is also provided with cutting teeth though merely a hardened surface may be sufficient dependent upon the nature of the material which is to be drilled.
  • further locking means are provided on the sub member nearer to the drilling bit end of the sub member than said first mentioned locking means.
  • These further locking means are similar to the first mentioned locking means and are preferably provided at the same diametrically opposed positions on the sub member as the first mentioned locking means.
  • the plungers of said further locking means are designed so as to prevent relative axial movement between said sub member and shearer in said one direction, when the plungers have engaged in said ports, chamfers on the plungers allowing these further locking means to be disengaged in the direction opposite to said one direction.
  • the sub member is connected both to a drilling rod string, preferably via a shock absorber which reduces impact loading and instantaneously applied torque, and to a drilling bit.
  • the sub member is locked by said first mentioned locking means to the casing shearer so that rotation of the drilling bit also rotates the casing shearer, the external dimensions of the drilling bit being smaller than the internal diameter of the cylindrical casing shearer.
  • the end of the casing shearer remote from the drilling bit is secured to an end of a conventional casing liner for a bore hole, the said rotational and thrust bearings allowing the casing shearer to rotate relative to the casing liner during a drilling operation.
  • drilling can commence, the drilling bit and casing shearer cutting through the strata, the cut material being fluidised by liquid or air forced through the drilling rod string, the central bore in the sub member and the drilling bit, and being conveyed away via circulation channels defined between the sub member and casing shearer, and the annular gap between the casing liner and the drilling rod string.
  • the casing liner is dragged down the bore hole.
  • the rod string can be retracted relative to the casing liner thus releasing said first mentioned locking means and subsequently engaging said further locking means.
  • the fluidised material By pressurizing the casing liner the fluidised material can be forced between the outer wall of the shearer and liner, and the wall of the borehole to set the liner in a secure position.
  • the arrangement shown in the accompanying drawings basically comprises a drilling bit 1, a drilling rod string 3 and a downhole casing shearer 5 constructed according to the present invention.
  • the downhole casing shearer 5 comprises a sub member 7 and a shearer 9, both of which are made of high quality drill collar steel.
  • the sub member 7 is generally cylindrical and the shearer 9 is a hollow cylindrical member the inside diameter of which is only slightly larger than both the diameter of the sub member and the external dimensions of the drilling bit 1.
  • the first or upper locking means comprises two cylindrical plungers 13 and 15 which are retained in recesses 17 and 19 respectively by pins 21, the recesses being sited at diametrically opposed positions in the side wall of sub member 7 and housing compression springs 23 which bias the plungers 13,15 to the radially outward position of Figs. 2 and 3 wherein they engage in apertures 11.
  • Each plunger 13,15 has a chamfered edge 25 which enables the plungers to be moved back into their respective recesses 17,19 if the sub member is moved upwards, as viewed in Fig. 3, relative to shearer 9.
  • the second or lower locking means comprises two further spring biassed plungers 27 and 29 which are also diametrically opposed with respect to each other and the axes-of which are parallel to the axes of plungers 13 and 15.
  • axial movement of sub member 7 relative to shearer 9 in the upwards direction as viewed in Fig. 3 causes plungers 13 and 15 to retract and disengage apertures 11 and plungers 27 and 29 to subsequently engage in apertures 11.
  • Chamfered surfaces 31 provided on plungers 27 and 29 allow sub member 7 to move downwards, as viewed in Fig. 3, to re-engage the said first locking means.
  • plungers 13,15,27 and 29 are illustrated as being cylindrical, they can of course be any suitable configuration e.g. planar, the only requirement being that they limit movement of the sub member relative to the shearer. Further, through apertures 11 can be replaced by suitable recesses on the inner wall of the shearer 9.
  • the inside diameter of the shearer 9 is identical to the inside diameter of a conventional casing liner 32 secured to one end thereof.
  • a smooth inner surface is.presented between the shearer 9 and liner 32.
  • the liner 32 has however only a wall thickness which is one half tc two thirds the wall thickness of the shearer and the exposed edge of the shearer is provided with cutting teeth 33.
  • Cutting teeth 35 are also provided on the other end of shearer 9 though teeth 33 and 35 can be replaced by hardened surfaces dependent upon the nature of the material being drilled.
  • the connection between the shearer 9 and the liner 32 is by way of thrust bearing 37 and rotational bearing 39.
  • the bearings 37 can take the strain of forcing the drilling bit 1 downwards whilst the shearer 9 rotates and liner 32 does not.
  • drilling bit 1 is connected to one end of sub member 7 by a suitable screw connection, and the other end of sub member 7 is connected, also by suitable screw connections, to drilling rod string.3 via shock absorber unit 41.
  • Shock absorber unit 41 reduces impact loading and torque on the bearings 37 and 39.
  • This unit 41 which is a proprietory item, can however be omitted if so desired.
  • the present invention thus simplifies downhole drilling removing at least some of the previously encountered problems.

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)
EP80303725A 1979-10-25 1980-10-22 Trépans alésoirs Withdrawn EP0028121A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB7936965 1979-10-25
GB7936965 1979-10-25
GB8012790A GB2062726B (en) 1979-10-25 1980-04-18 Downhole shearers
GB8012790 1980-04-18

Publications (1)

Publication Number Publication Date
EP0028121A1 true EP0028121A1 (fr) 1981-05-06

Family

ID=26273345

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80303725A Withdrawn EP0028121A1 (fr) 1979-10-25 1980-10-22 Trépans alésoirs

Country Status (3)

Country Link
EP (1) EP0028121A1 (fr)
GB (1) GB2062726B (fr)
NO (1) NO803151L (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0353168A1 (fr) * 1988-07-28 1990-01-31 Cogema Procédé et dispositif de forage pour l'étude et l'exploitation du sous-sol
EP0402337A3 (fr) * 1989-06-09 1991-05-02 Sandvik Aktiebolag Outil de perçage
WO1996028635A1 (fr) * 1995-03-11 1996-09-19 Enterprise Oil Plc Sabot de cuvelage perfectionne
US7395882B2 (en) 2004-02-19 2008-07-08 Baker Hughes Incorporated Casing and liner drilling bits
US7621351B2 (en) 2006-05-15 2009-11-24 Baker Hughes Incorporated Reaming tool suitable for running on casing or liner
US7624818B2 (en) 2004-02-19 2009-12-01 Baker Hughes Incorporated Earth boring drill bits with casing component drill out capability and methods of use
US7954571B2 (en) 2007-10-02 2011-06-07 Baker Hughes Incorporated Cutting structures for casing component drillout and earth-boring drill bits including same
US7954570B2 (en) 2004-02-19 2011-06-07 Baker Hughes Incorporated Cutting elements configured for casing component drillout and earth boring drill bits including same
US8245797B2 (en) 2007-10-02 2012-08-21 Baker Hughes Incorporated Cutting structures for casing component drillout and earth-boring drill bits including same
EP2300682A4 (fr) * 2008-06-26 2015-12-09 Atlas Copco Rotex Ab Oy Procédé et appareil de forage
CN104727749B (zh) * 2015-01-29 2016-10-19 同济大学 蠕动钻地机器人
RU2751298C1 (ru) * 2020-12-15 2021-07-13 Публичное акционерное общество "Татнефть" имени В.Д. Шашина Устройство для бурения на обсадной колонне

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI95618C (fi) * 1992-12-03 1998-09-03 Jorma Jaervelae Porauslaitteisto

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2239996A (en) * 1936-05-25 1941-04-29 Chappell Drilling Equipment Co Drilling apparatus
US3199613A (en) * 1962-09-28 1965-08-10 Shell Oil Co Method and apparatus for drilling an underwater well
US3343615A (en) * 1966-08-15 1967-09-26 Exxon Production Research Co Drill collar with cutting surface
US3552509A (en) * 1969-09-11 1971-01-05 Cicero C Brown Apparatus for rotary drilling of wells using casing as drill pipe
US3732143A (en) * 1970-06-17 1973-05-08 Shell Oil Co Method and apparatus for drilling offshore wells
US3901331A (en) * 1972-12-06 1975-08-26 Petroles Cie Francaise Support casing for a boring head

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2239996A (en) * 1936-05-25 1941-04-29 Chappell Drilling Equipment Co Drilling apparatus
US3199613A (en) * 1962-09-28 1965-08-10 Shell Oil Co Method and apparatus for drilling an underwater well
US3343615A (en) * 1966-08-15 1967-09-26 Exxon Production Research Co Drill collar with cutting surface
US3552509A (en) * 1969-09-11 1971-01-05 Cicero C Brown Apparatus for rotary drilling of wells using casing as drill pipe
US3732143A (en) * 1970-06-17 1973-05-08 Shell Oil Co Method and apparatus for drilling offshore wells
US3901331A (en) * 1972-12-06 1975-08-26 Petroles Cie Francaise Support casing for a boring head

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0353168A1 (fr) * 1988-07-28 1990-01-31 Cogema Procédé et dispositif de forage pour l'étude et l'exploitation du sous-sol
FR2634818A1 (fr) * 1988-07-28 1990-02-02 Cogema Procede et dispositif de forage pour l'etude et l'exploitation du sous-sol
WO1990001102A1 (fr) * 1988-07-28 1990-02-08 Cogema Procede et dispositif de forage pour l'etude et l'exploitation du sous-sol
US5125464A (en) * 1988-07-28 1992-06-30 Cogema Drilling device for the study and exploitation of the subsoil
EP0402337A3 (fr) * 1989-06-09 1991-05-02 Sandvik Aktiebolag Outil de perçage
WO1996028635A1 (fr) * 1995-03-11 1996-09-19 Enterprise Oil Plc Sabot de cuvelage perfectionne
US6062326A (en) * 1995-03-11 2000-05-16 Enterprise Oil Plc Casing shoe with cutting means
US8205693B2 (en) 2004-02-19 2012-06-26 Baker Hughes Incorporated Casing and liner drilling shoes having selected profile geometries, and related methods
US8225887B2 (en) 2004-02-19 2012-07-24 Baker Hughes Incorporated Casing and liner drilling shoes with portions configured to fail responsive to pressure, and related methods
US7624818B2 (en) 2004-02-19 2009-12-01 Baker Hughes Incorporated Earth boring drill bits with casing component drill out capability and methods of use
US7748475B2 (en) 2004-02-19 2010-07-06 Baker Hughes Incorporated Earth boring drill bits with casing component drill out capability and methods of use
US7954570B2 (en) 2004-02-19 2011-06-07 Baker Hughes Incorporated Cutting elements configured for casing component drillout and earth boring drill bits including same
US8006785B2 (en) 2004-02-19 2011-08-30 Baker Hughes Incorporated Casing and liner drilling bits and reamers
US8167059B2 (en) 2004-02-19 2012-05-01 Baker Hughes Incorporated Casing and liner drilling shoes having spiral blade configurations, and related methods
US8297380B2 (en) 2004-02-19 2012-10-30 Baker Hughes Incorporated Casing and liner drilling shoes having integrated operational components, and related methods
US8191654B2 (en) 2004-02-19 2012-06-05 Baker Hughes Incorporated Methods of drilling using differing types of cutting elements
US7395882B2 (en) 2004-02-19 2008-07-08 Baker Hughes Incorporated Casing and liner drilling bits
US8225888B2 (en) 2004-02-19 2012-07-24 Baker Hughes Incorporated Casing shoes having drillable and non-drillable cutting elements in different regions and related methods
US7900703B2 (en) 2006-05-15 2011-03-08 Baker Hughes Incorporated Method of drilling out a reaming tool
US7621351B2 (en) 2006-05-15 2009-11-24 Baker Hughes Incorporated Reaming tool suitable for running on casing or liner
US7954571B2 (en) 2007-10-02 2011-06-07 Baker Hughes Incorporated Cutting structures for casing component drillout and earth-boring drill bits including same
US8245797B2 (en) 2007-10-02 2012-08-21 Baker Hughes Incorporated Cutting structures for casing component drillout and earth-boring drill bits including same
US8177001B2 (en) 2007-10-02 2012-05-15 Baker Hughes Incorporated Earth-boring tools including abrasive cutting structures and related methods
EP2300682A4 (fr) * 2008-06-26 2015-12-09 Atlas Copco Rotex Ab Oy Procédé et appareil de forage
CN104727749B (zh) * 2015-01-29 2016-10-19 同济大学 蠕动钻地机器人
RU2751298C1 (ru) * 2020-12-15 2021-07-13 Публичное акционерное общество "Татнефть" имени В.Д. Шашина Устройство для бурения на обсадной колонне

Also Published As

Publication number Publication date
GB2062726B (en) 1983-10-12
NO803151L (no) 1981-04-27
GB2062726A (en) 1981-05-28

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR IT LU NL SE

17P Request for examination filed

Effective date: 19811029

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19840120

RIN1 Information on inventor provided before grant (corrected)

Inventor name: FLETCHER, FREDERICK