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
  • 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
  • E21B7/208—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes using down-hole drives
• • 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
  • E21B7/201—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes with helical conveying means
• • 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
  • E21B17/02—Couplings; joints
  • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
  • E21B17/046—Couplings; joints between rod or the like and bit or between rod and rod or the like with ribs, pins, or jaws, and complementary grooves or the like, e.g. bayonet catches

Definitions

• This invention relates to a drilling apparatus according to patent claim 1, the drilling equipment of which can be de ⁇ tached from and refixed to the drill bit when the apparatus is drilling.
• the advantages of the invention are that even in a drilling unit, where the drill bit cannot be pulled out from the bore, at least the most significant parts, for instance the hammer ⁇ ing machine and the transportating equipment, can be taken out from the bore and also be put back if drilling is continued.
• the drill bit can be made less valuable so that in certain cases, for instance when the drill bit arrives at a dead end, the bit can be left, intentionaly, in the bore.
• the drill bit can be made long-lasting since by means of the inventional con-struction it possible to carry out service in the hammering machine even during drilling by pulling it out from the bore and, accordingly, the probability of successfull drillings grows and more often one can drill through to final destinations.
• the steering joint between drill bit and protective tube keeps the drill bit constantly in place in the bore when the hammering machine is pulled out.
• Fig. 1 is a side section of the drilling apparatus
• Fig. 2 is a joint between hammering machine and drill bit
• Fig. 3 is the joint viewed from the end
• Figure 1 shows the drilling apparatus comprising a hammering machine 1, outside of it a protective tube 2, which will re ⁇ main in the bore, an extendable transportation tube 3 behind the hammering tool, and a hammering and rotating drill bit 4.
• the drill bit is furnished with working buttons 5.
• the outer drill bit shell has a groove 12 matching with ring 8 in the edge of protective tube 2 to restrict axial motion between drill bit and protective tube.
• Through drill bit 2 runs a channel 6 for conveyance of compressed air from hammering machine to the front of the drill bit, from where it conveys drill waste further backwards through chan-nel 7.
• the hammering machine piston 9 is in direct contact with drill bit 2, against which the strokes are transmitted.
• the hammering machined is pushed from the rear by suitable force over the transportation tube line in order to retain contact in the hammering surface at least at the moment of stroke.
• the transport ⁇ ation tube 3 and hammering machine 1 can be pulled out from bore while drill bit 4 remains suspended in protective tube 2.
• the construction in figure 1 is a simple version of the in ⁇ vention. Anyhow, for securer operation, the drill bit and the hammering machine joint must be furnished with locking or steering means to secure that the drill bit and hammering machine piston retain their concentricity while rotating.
• Figure 2 shows a version of locking means between drill bit and hammering machine.
• piston 9 there are pins 10 or similar projecting parts, which by means of a tiny rotative motion match behind corner pieces 11 in the counter-part, i.e. the drill bit.
• Fig. 3 shows the same ver ⁇ sion viewed from the end. Thanks to low locking force, smaller than the resistance of rotation, such a joint opens and locks also in the bore.
• the joint between drill bit and hammering machine can be made by a number of easily detachable methods, the common feature of which is that, for transmission of stroke to the drill bit, a hammering surface is produced between hammering machine pis ⁇ ton or spindle and the drill bit has steering surfaces or ele ⁇ ments to ensure that the piston remains on the counter-face during rotation and dril-ling and the spindle or piston of the hammering machine is steered to the counter-face, when the hammering machine is being refitted into the bore and approaching the drill bit.
• the cheap simple single drill bit can be left in the bore when the other equipment is pulled out from it.
• the drill bit is made as a relatively thin disc supported by a spindle, which is pulled out with the hammering machine. This arrange ⁇ ment often comes up on drilling downward, whereby they end at a certain depth.

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (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)
• Earth Drilling (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8541159

Family Applications (1)

Country Status (3)

Cited By (8)

Citations (4)

• 1994
  • 1994-08-03 FI FI943603A patent/FI98400C/fi not_active IP Right Cessation
• 1995
  • 1995-08-03 AU AU30797/95A patent/AU3079795A/en not_active Abandoned
  • 1995-08-03 WO PCT/FI1995/000414 patent/WO1996004456A1/en active Application Filing

Patent Citations (4)

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events