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
  • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
  • E21B17/18—Pipes provided with plural fluid passages
• • 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
  • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
  • E21B21/12—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using drilling pipes with plural fluid passages, e.g. closed circulation systems

Definitions

• the invention relates to a drilling tool for drilling soft and fragmented rock.
• a prior art drawback is that when a grooved guide tube is used, the grooved portions of the tube may break the wall of the hole, which makes the hole cave in regardless of the intention to the contrary. Furthermore, if a separate protective tube is used, extra equipment is required for installing and disassembling the protective tubes.
• the object of the present invention is to provide a drilling tool for preventing better than previously the caving in of the hole walls when fragmented or soft material is being drilled.
• the drilling tool of the invention is characterized in that it comprises a portion having a round cross section and a smooth surface and positioned substantially symmetrically relative to the middle axis of a drill rod and comprising, at least at the end intended to be positioned towards the rock drill, a part converging towards the axis of the drill rod, and that it comprises, for rinsing medium, through-going conduits that terminate in said converging part.
• the drilling tool is a part that has a smooth outer surface, is positioned symmetrically relative to the middle axis of the drill rod and comprises converging ends in such a manner that during the rotation of the drill rod it penetrates through the material that tends to cave in and simultaneously compresses and grinds the material tightly against the wall of the drill hole.
• the tool of the invention is further characterized in that it comprises through-going longitudinal conduits, through which the rinsing medium is allowed to flow away from the drill hole.
• An advantage of the invention is that during the drilling of soft or fragmented material, the drill hole can be kept open, as the tool compresses the detaching material tightly into the wail of the drill hole.
• a further advantage of the invention is that since the flow of rinsing medium is arranged through the drilling tool, and not along the grooves on its outer surface, the flow of rinsing medium does not corrode or detach material from the wall of the drill hole very easily, and thus does not cause cave- ins very easily in a ready-made hole.
• a still further advantage of the invention is that if for some reason the drill hole caves in, it can be opened quite easily by means of the drilling tool.
• Figure 1 schematically shows an embodiment of a drilling tool installed in a drill rod
• Figure 2 schematically shows an embodiment of a drilling tool seen from above
• Figure 3 schematically shows the drilling tool shown in Figure 2 in the longitudinal direction in section along line A - A,
• FIG. 4 shows another embodiment of the tool disclosed in the invention.
• FIG. 5 shows still another embodiment of the tool disclosed in the invention.
• Figure 1 shows a drilling tool of the invention installed in a drill rod. It shows a short drill rod 1 , one end of which comprises an external thread 2 for fastening a drill bit, the other end comprising an internal thread 3 for fastening a second drill rod.
• a drilling tool 4 is fastened onto the drill rod 1.
• the drilling tool 4 is installed in a separate short part of the drill rod intended to be installed between a normal drill bit and a drill rod of a normal length.
• each end of the drilling tool 4 is provided with a converging part 4a, which is connected to the drill rod at each end thereof and, correspondingly, to the middle part of the drilling tool in a rounded manner in a manner generating a smooth, even surface.
• Figure 1 further shows openings 5 at the converging part 4a at both ends of the drilling tool 4.
• the openings 5 are interconnected by means of a conduit described later in connection with Figure 3, allowing rinsing medium to flow between the ends of the drilling tool 4 without the rinsing medium having to flow from between the outer surface of the drilling tool and the surface of the hole.
• a rinsing medium flow may cause caving in of the walls of a hole.
• Figure 2 schematically shows a drilling tool seen from the end.
• the cross section of the drilling tool 4 is substantially cylindrical and the tool has a smooth surface. Its diameter is dimensioned in a manner making it slightly smaller than the outer diameter of the drill bit intended to be used therewith. The reason for this is to allow the tool to pass through a hole made by the drill bit in a hole drilled in a potentially hard rock. It also shows how a plurality of conduits 5a lead through the drilling tool 4 for allowing rinsing medium to flow out of the drill hole.
• Figure 2 also shows a conduit 1a in the middle of the drill rod 1 , along which conduit the rinsing medium flows to the drill bit and further through conduits therein to the drill hole for transporting drilling residue out of the drill hole.
• FIG 3 schematically shows the drilling tool according to Figure 2 in the longitudinal direction in section along line A - A.
• the openings 5 are at the ends of the conduit 5a inside the drilling tool.
• a suitable number of such conduits e.g. 6 or less or more, may be positioned around the axis of the drilling tool. It is essential that the number and the common cross-sectional area of the openings are sufficient for the outflow of the rinsing medium and the material transported therewith.
• the cross section of the conduits passing through the drilling tool may be, not only round, but also of another shape, such as angular, oval, etc.
• the edges of the opening may be inclined inwards, allowing them to push the material outwards from the openings when hitting it.
• FIG 4 schematically shows another embodiment of drilling tool.
• the drilling tool is arranged at one end of a drill rod 1 of a conven- tional length, close to the external thread 2 such that it is positioned almost immediately after the drill bit, when the drill bit is fastened to the drill rod 1.
• the control and operation of the drilling rig are as in normal drilling, and no separate short drilling for using exclusively the drilling tool is required at the beginning of the drilling.
• FIG. 5 schematically shows still another embodiment of a drilling tool.
• the drilling tool is composed as an entity integrated into the drill bit 6.
• the conduits for removing rinsing medium and drilling residue naturally pass straight through the drill bit and the tool part.
• the drilling tool may be fastened onto the drill rod in a plurality of manners known per se. For example, the drilling tool may be pushed onto the drill rod and then welded thereto at its ends, followed by finishing of the surface suitably smooth. Alternatively, the drilling tool, preferably comprising only a short drill rod, may be directly machined as a solid entity, for example. Other manners of manufacture and fastening are also usable.

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)
• Mechanical Engineering (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Geochemistry & Mineralogy (AREA)
• Earth Drilling (AREA)
• Processing Of Stones Or Stones Resemblance Materials (AREA)
• Drilling Tools (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

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ID=37832221

Family Applications (1)

Country Status (10)

Families Citing this family (1)

Citations (2)

Family Cites Families (9)

• 2007
  • 2007-02-01 FI FI20075066A patent/FI20075066L/fi not_active Application Discontinuation
• 2008
  • 2008-01-30 AU AU2008211808A patent/AU2008211808B2/en not_active Ceased
  • 2008-01-30 JP JP2009547720A patent/JP2010518278A/ja active Pending
  • 2008-01-30 WO PCT/FI2008/050028 patent/WO2008092994A1/en active Application Filing
  • 2008-01-30 US US12/525,189 patent/US20100000797A1/en not_active Abandoned
  • 2008-01-30 CA CA002675842A patent/CA2675842A1/en not_active Abandoned
  • 2008-01-30 EP EP08709297A patent/EP2137373A1/en not_active Withdrawn
  • 2008-01-30 RU RU2009132669/03A patent/RU2009132669A/ru not_active Application Discontinuation
  • 2008-01-30 CN CNA2008800039343A patent/CN101600848A/zh active Pending
• 2009
  • 2009-07-20 ZA ZA200905044A patent/ZA200905044B/xx unknown

Patent Citations (2)

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