WO1996029499A1 - Aleseur a rouleaux bidirectionnels - Google Patents

Aleseur a rouleaux bidirectionnels Download PDF

Info

Publication number
WO1996029499A1
WO1996029499A1 PCT/AU1996/000150 AU9600150W WO9629499A1 WO 1996029499 A1 WO1996029499 A1 WO 1996029499A1 AU 9600150 W AU9600150 W AU 9600150W WO 9629499 A1 WO9629499 A1 WO 9629499A1
Authority
WO
WIPO (PCT)
Prior art keywords
rollers
reamer
borehole
fishing neck
diameters
Prior art date
Application number
PCT/AU1996/000150
Other languages
English (en)
Inventor
Terry Michael Mcmanus
Original Assignee
Gearhart United Pty. 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 Gearhart United Pty. Ltd. filed Critical Gearhart United Pty. Ltd.
Priority to AU49325/96A priority Critical patent/AU701439B2/en
Publication of WO1996029499A1 publication Critical patent/WO1996029499A1/fr

Links

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
    • E21B10/003—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
    • 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
    • E21B10/28—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with non-expansible roller cutters
    • E21B10/30—Longitudinal axis roller reamers, e.g. reamer stabilisers

Definitions

  • This invention relates to a roller reamer of the general type which is used in boreholes, and also to a method of reamer extraction from a borehole.
  • the invention is an improvement over the Applicant's earlier Australian Patent
  • the Application No PCT/AU94/00691 disclosed the use of a piston floating freely in a cylindrical lubricant passage and lying between a bearing surface of a roller and the pressure force exterior of the roller so that the piston would apply the same pressure to lubricant as the external pressure, thereby reducing the pressure differential otherwise existing and in turn retaining the lubricant in the bearing structure.
  • this invention is particularly useful with the subject matter of PCT Application No PCT/AU/94/00691, but is not limited thereto.
  • a major difficulty which is sometimes encountered is extraction of a borehole reamer from a borehole when it has been partly or fully bored.
  • the borehole reamer can become locked in a borehole.
  • One reason is the partial collapse of the walls of the borehole, another reason can be the curvature of the borehole which sometimes is required to have a lateral as well as a vertical component of direction, and prior art reamers tend to rigidly engage the surface defining the borehole, and sometimes slight earth movement, due for example to a small earthquake, can dislodge strata of rock or sedimentary layers with respect to one another.
  • a borehole reamer is provided with reamer rollers each having hard projecting studs spaced along its length, the rollers being of greater length than prior art rollers, each having a major diameter which gradually tapers to at least one of its ends which has a minor diameter, at least some of the rollers being tapered in both directions to converge towards their ends.
  • reamer rollers each having hard projecting studs spaced along its length, the rollers being of greater length than prior art rollers, each having a major diameter which gradually tapers to at least one of its ends which has a minor diameter, at least some of the rollers being tapered in both directions to converge towards their ends.
  • They can, for example, be symmetrical about a central equatorial plane, and in use, the studs will gradually ream a bore hole wall if the reamer is rotated as it is retracted
  • Fig 1 shows a double-ended reamer, with minor diameters at both ends, within a bore hole
  • Fig 2 shows the reamer roller of Fig 1 drawn to a larger scale, wherein the major diameter 'D' is located centrally between the ends each having a minor diameter 'd' only slightly less than diameter 'D';
  • Fig 3 shows a second embodiment wherein there are two sets of reamer rollers, one near a downhole end of a borehole, and the other near the fishing neck end; and
  • Fig 4 shows a second embodiment, similar to Fig 3, but illustrating a longer reamer.
  • a borehole reamer body 10 supports a plurality of reamer rollers 11 in the same manner as described in our aforesaid Australian Patent 594885.
  • Each reamer roller 11 is provided with a plurality of tungsten carbide insert studs 12 projecting from the outer surface
  • the intermediate part of the roller is designated 14, and the roller as illustrated is symmetrical about a central equatorial plane although that is not always essential.
  • the intermediate part 14 has a generally cylindrical outer surface but the outer surface tapers from the larger diameter (D) of the intermediate part 14 to the smaller diameter (d) at the ends 18.
  • the diameter difference is small, in the embodiment illustrated in Fig 2 being from 41 mm at the intermediate part 14 to 38 mm at the ends 18, so that reaming is both gradual and progressive both in downhole directions and during extraction. This is an important aspect of the invention.
  • the surfaces can be tapered to converge towards the respective ends, as shown they are each provided with a series of steps 15 of diminishing diameter towards the respective ends of the roller, in order to simplify drilling for studs 12.
  • the tungsten carbide insert studs 12 project both from the central portion
  • the envelope shape therefore constitutes a larger diameter cylindrical central portion, with two tapered portions extending towards respective ends.
  • a rotating drill string can ream the surface of the hole as the string is withdrawn, thereby further consolidating the earth material.
  • Figs 3 and 4 also illustrate the downhole end of the reamer a body 10 having rollers 11 arranged in a circumferential set of three rollers, as in the first embodiment.
  • the very gradual diameter reduction from the intermediate part 14 to the ends 18 is likely to inhibit reaming of a partly collapsed or displaced hole wall, and a preliminary reaming operation is useful during extraction of a reamer and borehole bit.
  • Figs 3 and 4 achieves the preliminary extraction by use of a set of smaller reamer rollers 20, each roller 20 having a large diameter (D1) downhole end, and the curved surface 21 reduces in diameter towards the fishing neck end 22.
  • Dimension D1 is less than dimension D
  • the smaller reamer rollers upon rotation, can provide initial reaming of the hole wall.
  • rollers 11 Since, however, upon down hole boring, rollers 11 will have already reamed the hole wall before it is traversed by the reamer rollers 20, there is no need for rollers 20 to be "double ended", with two small diameter ends and one large intermediate diameter part, as with the downhole reamer rollers 11.
  • the ratio of large to small diameters should not exceed 1.5 and the ratio of large diameter to distance from small diameter should not exceed 0.8, since beyond these limits the required gradual progressive reaming of a borehole surface will be negated.
  • Fig 4 illustrates a reamer with two sets of rollers 11 and 20. It is noteworthy that the rollers 20 near the fishing neck end are staggered with respect to the rollers 11 near the downhole end of body 10, and further that the ratio large diameter to the distance between that diameter and the small is about 0.6. In other respects the Fig 4 reamer is similar to that shown in Fig 3, and the numerals on those figures designate similar features. A consideration of the above two embodiments will indicate that this invention comprises a simple and effective way of overcoming the frequently encountered problem of extracting a reamer/borehole bit from a borehole.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)

Abstract

Un aléseur de forage (10) présente des rouleaux (11, 20), chacun d'eux comportant des picots saillants (12) disposés sur toute sa longueur, les rouleaux ayant chacun un diamètre principal (D) qui diminue jusqu'à un diamètre secondaire (d, d2) au moins à l'une de ses extrémités (18) et, dans certains cas, le diamètre secondaire (d) se trouve aux deux extrémités.
PCT/AU1996/000150 1995-03-20 1996-03-19 Aleseur a rouleaux bidirectionnels WO1996029499A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU49325/96A AU701439B2 (en) 1995-03-20 1996-03-19 Bi-directional roller reamer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPN1832 1995-03-20
AUPN1832A AUPN183295A0 (en) 1995-03-20 1995-03-20 Bi-directional roller reamer

Publications (1)

Publication Number Publication Date
WO1996029499A1 true WO1996029499A1 (fr) 1996-09-26

Family

ID=3786188

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1996/000150 WO1996029499A1 (fr) 1995-03-20 1996-03-19 Aleseur a rouleaux bidirectionnels

Country Status (2)

Country Link
AU (1) AUPN183295A0 (fr)
WO (1) WO1996029499A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999063291A1 (fr) * 1998-06-02 1999-12-09 Tml Technik Gmbh Teleskopsysteme Procede et dispositif pour enlever et/ou oter en les brisant des couches ou des zones situees dans des substrats
US9157282B2 (en) 2011-11-30 2015-10-13 Smith International, Inc. Roller reamer compound wedge retention

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2029770A (en) * 1934-10-26 1936-02-04 Grant John Roller cutter reamer
EP0274265A2 (fr) * 1987-01-06 1988-07-13 DARRON TOOL & ENGINEERING (SHEFFIELD) LIMITED Dispositif d'alésoir à rouleaux
US5381868A (en) * 1993-10-08 1995-01-17 Triumph*Lor Inc Sealed bearing roller reamer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2029770A (en) * 1934-10-26 1936-02-04 Grant John Roller cutter reamer
EP0274265A2 (fr) * 1987-01-06 1988-07-13 DARRON TOOL & ENGINEERING (SHEFFIELD) LIMITED Dispositif d'alésoir à rouleaux
US5381868A (en) * 1993-10-08 1995-01-17 Triumph*Lor Inc Sealed bearing roller reamer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999063291A1 (fr) * 1998-06-02 1999-12-09 Tml Technik Gmbh Teleskopsysteme Procede et dispositif pour enlever et/ou oter en les brisant des couches ou des zones situees dans des substrats
US9157282B2 (en) 2011-11-30 2015-10-13 Smith International, Inc. Roller reamer compound wedge retention

Also Published As

Publication number Publication date
AUPN183295A0 (en) 1995-04-13

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