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
  • E21B10/08—Roller bits
  • E21B10/22—Roller bits characterised by bearing, lubrication or sealing details
  • E21B10/24—Roller bits characterised by bearing, lubrication or sealing details characterised by lubricating details
• • 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 rotary roller reamer of the general type which is used in boreholes, and described and illustrated in the Applicant's earlier Australian Patent No 594885.
• the main object of this invention is to provide a more satisfactory bearing arrangement, and this has been achieved by utilising a piston which floats freely in a cylindrical lubricant passage and lies between a bearing surface of the roller and the pressure space exterior of the roller, so that the piston will apply the same pressure to lubricant as the external pressure, thereby reducing the pressure differential and in turn retaining the lubricant in the bearing structure.
• Fig 1 is a fragmentary view of a reamer body, showing two of three roller sets;
• Fig 2 is a longitudinal section through Fig 1 and drawn to a slightly larger scale
• Fig 3 is a split cross-section taken on line 3-3 of Fig 2, drawn to a still further larger scale.
• a rotary roller reamer 10 is of the type which is used for reaming a hole cut by a drill on the end of a drill string.
• the functions of a reamer are first to maintain a hole size when wear causes the effective diameter of a drill to reduce, and second to smooth the surface of the borehole.
• the rotary roller reamer arrangement of this invention performs those functions.
• the reamer 10 shown in Fig 1 contains several rollers 11 each with a plurality of tungsten carbide buttons 12 arranged circumferential ly around it.
• the spindle 13 is retained in respect to the blocks 14 either by retainer fasteners, herein grub screws 15, and these come away with the blocks 14 when they are removed so that they can be separately removed and there is no access difficulty as with the early prior art.
• passages 19 Running centrally part way into the spindle 13 from its ends are passages 19, shown partly in Fig 2 as being formed by the walls of an aperture extending from one end , and partly by the bore of a tube 20 extending from the other, the wall of tube 20 functioning as a heat transfer wall to reduce surface temperatures of the adjacent bearing.
• the tube 20 is illustrated to contain a piston 21 which can conveniently be of elastomeric material, and that piston is freely slidable within the tube 20.
• the outer end of the tube 20 opens to a "breather" aperture 22 in the reamer body, and the piston then being slidable imparts the same pressure inside the passage 19 as exists around the drill string, with very little pressure differential.
• the interior of the roller is charged with grease through a pressure plug 27, and that grease is pressured by the piston 21 to be the same as the external pressure. It is possible to use two resilient seals, and the resilient seals 28 between spindle 13 and roller 11 are lubricated by the grease and seal it against expulsion, while the resilient seals 29 sealing between a said block 14, spindle 13 and roller 11 , and performing the primary function of reducing the ingress of abrasive material to the seals 28 and the secondary function of partly effecting a seal against ingress of moisture.
• the spindle 13 is provided with two flats 30 connected to the passages 19 through diametral apertures 31 , and this lubrication is of great importance in the difficult environment of a bore hole, flow of grease being impelled from tube 20 to the flats 30, and thereby to the bearing surface of spindle 13, by externally supplied pressure.

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)
• Rolls And Other Rotary Bodies (AREA)
• Massaging Devices (AREA)
• Sliding-Contact Bearings (AREA)
• Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
• Joints Allowing Movement (AREA)
• Chemical And Physical Treatments For Wood And The Like (AREA)
• Rollers For Roller Conveyors For Transfer (AREA)
• Cleaning In General (AREA)
• Polishing Bodies And Polishing Tools (AREA)

Applications Claiming Priority (4)

Publications (3)

Family

ID=3777338

Family Applications (1)

Country Status (8)

Families Citing this family (8)

Citations (6)

Family Cites Families (3)

• 1994
  • 1994-11-10 CA CA002154285A patent/CA2154285C/en not_active Expired - Lifetime
  • 1994-11-10 HU HU9502230A patent/HU218196B/hu unknown
  • 1994-11-10 AT AT95900553T patent/ATE242417T1/de active
  • 1994-11-10 EP EP95900553A patent/EP0678150B1/de not_active Expired - Lifetime
  • 1994-11-10 WO PCT/AU1994/000691 patent/WO1995013452A1/en active IP Right Grant
  • 1994-11-10 RU RU95114368A patent/RU2105122C1/ru active
  • 1994-11-10 DE DE69432786T patent/DE69432786T2/de not_active Expired - Lifetime
• 1995
  • 1995-08-03 BG BG99845A patent/BG62058B1/bg unknown

Patent Citations (6)

Non-Patent Citations (1)

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