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
  • E21B4/00—Drives for drilling, used in the borehole
  • E21B4/06—Down-hole impacting means, e.g. hammers
  • E21B4/14—Fluid operated hammers
• • 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
  • E21B4/00—Drives for drilling, used in the borehole
• • 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
  • E21B4/00—Drives for drilling, used in the borehole
  • E21B4/20—Drives for drilling, used in the borehole combined with surface drive
• • 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
  • E21B6/00—Drives for drilling with combined rotary and percussive action

Definitions

• Deep exploration of the soil is generally carried out using a rotary drill bit which, made integral with the end of tubes which are lengthened in successive sections as the drill bit advances in depth, is entrained by said tubes in their rotational movement, at the same time as a pressurized liquid (generally charged with lubricating particles) and leads through them to the drill bit, in order to evacuate the pulverized rocks which rise to the surface entrained by said liquid between the borehole wall and the tubes.
• a pressurized liquid generally charged with lubricating particles
• this percussion movement is carried out by means of a manceuvré mass in the manner of a hammer acting on the drill bit and contained in the drilling head, said hammer being driven by an alternating movement by exclusively pneumatic means.
• Such a source of energy has the disadvantage that it does not allow the use of such a device in drilling which requires the injection of mud, therefore, practically in rock drilling and deep drilling or in medium furniture .
• the hydrostatic pressure of the liquid charged with mud which the drilling contains creates at the level of the drill bit a back pressure which is a function of the depth of the drilling, which imposes a very high air pressure to ensure the operation of the machine, whose efficiency is therefore poor compared to the energy expended.
• this device combines the percussion and rotation movements of the drill bit, which improves the energy efficiency compared to the last patent cited. But in addition, if the device which is the subject of the invention, as it will be described, does indeed include a hammer contained in the drilling head and periodically striking the tail of the drill bit, as is the case in the first patent cited, it will be noted that the fluid used to transmit the motive force necessary for the reciprocating movement of the hammer is essentially the same liquid which is sent inside the drilling tubes to the drill bit to lubricate the working face and raise the drilling mud.
• Figure 1 is a schematic elevational view of the subject of the invention.
• Figure 2 is a schematic view in diametrical vertical section of the same object.
• the drill head which has at its upper end the conical screw 1 allowing its adjustment to the lowest drill rod and at its lower end the drill bit 2, is constituted by a cylindrical body formed by two main parts 3 and 4 sliding between them along the central cylinder 5 (fig. 2) which guides them one on the other and which simultaneously drives the lower part 4 in rotation by through the grooves 6 with which said central cylinder 5 is provided according to its external generatrices, at its part closest to the part 3, said grooves cooperating with the grooved ring 7 complementary the sliding of the two elements 3 and 4, one relative to the other, being limited by the stop 8 integral with the cylinder 5.
• the lower part 9 of said cylinder 5 is smooth at the level of its fitting fitted into the body 10 which forms the upper part of the element nt 4, the seal being ensured at this level by the O-ring 43.
• the opposite parts of the skirt 11 and of the bottom of the bore of the part 10 are chamfered towards the outside, in reverse, so as to reject towards the outside, in their reciprocal sliding movement, the rock debris which could be placed at this level during the drilling work.
• the lower part 4 of the drill pipe, in which the upper part 3 slides, is itself formed by two bodies 13 and 14 made integral with one another by permanent interlocking at 15 and made the same, together, integral with the part 10, in which the cylinder 5 slides.
• the part upper 3 is formed of a hollow cylinder which counter the hydraulic turbine 16 which controls the hydraulic pump 17, contained in the same cell.
• the cylinder 5 itself hollow, communicating the inner part of the upper body 3 with the intermediate body 13, which is itself also hollow and which contains the annular reservoir 18, which surmounts the lower body 14 which has a lower cylinder 19 , bored so that a vacuum 20 is left between this cylinder 19 and the inner wall of the body 14.
• the cylinder 19 is also internally bored for receiving a hydraulic percussion member 21 of known type carrying the step 22 and being able to slide freely inside the cylinder 19, being retained at its upper part by the shutter 13 of the cylinder 19, with interposition of the shock absorber spring 24.
• the drill bit 2 capable of sliding freely in the threaded bush 25 screwed into the lower part of the body 14.
• the drill bit 2 and this bush 25 each carry complementary grooves 26 which make it possible to drive the drill bit 2 in rotation, when the whole of the drilling head is driven by the rods which carry it, at the same time as said drill bit can freely slide in said socket under the effect of the vibrations of the hammer 22 on the shank 27 of the drill bit, by means of the counterweight 28 interposed between the hammer 22 and the shank 27, and held between these two parts by the annular silentbloc 29, the outer ring of which is tightly screwed inside the body 19, the presence of this intermediate elastic piece allowing the sealing between the two chambers thus created: that 19 containing the percussion member, itself sealed relative to the body 14 which contains it, and that containing the tail 27 of the drill bit 2.
• Said tail 27 comprises the stop 30 which limits its downward movements.
• the threaded bush 25 is blocked by the fixed stop 31 and is drilled to present the conduits 32 which communicate with the annular conduit 20 through the chamber 33 and with the drill bit which itself presents the conduits 34 which open at its lower surface L the assembly is completed by the distributor 35 and by the flexible tube 36 which connects the suction of the pump 17 to the reservoir 18, the flexible tube 37 which connects the pressure outlet of the pump 17 to the distributor 35, the flexible tube 38 which connects an outlet of the distributor 35 to the hydraulic percussion member 21, the tubing flexible 39 which connects the return of the percussion member to the reservoir 18 and the tube 40 which directly connects the other outlet of the distributor 35 to the reservoir 18.
• the liquid, intended to lubricate the cutting front and to raise the drilling mud to the outer periphery of the machine will reach the drilling head through the tubes drilling units connected to the conical thread 1.
• This liquid will pass through the upper zone 3 of the device setting in motion the turbine 16 which will itself drive the hydraulic pump 17.
• this liquid will pass through the hollow cylinder 5, cross the central channel of the annular reservoir 18, reach the peripheral channel 20 of the lower body 14 to enter the chamber 33, from where it will be injected up to the surface of the cutting front at through 32 and 34, thus playing the role for which it is intended.
• control lever 41 of the distributor 35 which remains constantly in contact with the lower surface of the cylinder 5, will be in the high position, which will have the effect (the distributor 35 playing the role of bypass) return the liquid delivered directly to the reservoir 18 through the tube 40 under pressure by the pump 17.
• the device object of the present invention can be used for drilling in rocky terrain to facilitate penetration as well as in soft or aquiferous ground, the continuous injection of the evacuation liquid, which can be maintained independently of the work of the drill bit, allowing the borehole to be kept always under pressure, in order to avoid landslides in this case.

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)

Applications Claiming Priority (1)

Publications (1)

Family

ID=9279055

Family Applications (1)

Country Status (3)

Cited By (1)

Families Citing this family (6)

Family Cites Families (1)

• 1982
  • 1982-11-04 FR FR8218834A patent/FR2535780A1/fr not_active Withdrawn
• 1984
  • 1984-05-02 WO PCT/FR1984/000120 patent/WO1985005145A1/fr unknown
  • 1984-05-02 EP EP19840901777 patent/EP0181326A1/de not_active Withdrawn

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events