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
  • E21B10/12—Roller bits with discs cutters
• • 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
  • E21B10/02—Core bits
  • E21B10/04—Core bits with core destroying 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
  • E21B10/00—Drill bits
  • E21B10/02—Core bits
  • E21B10/06—Roller core bits
• • 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
• • 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
  • E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
  • E21B10/34—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools of roller-cutter type
• • 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
  • E21B17/1057—Centralising devices with rollers or with a relatively rotating sleeve

Definitions

• the present invention concerns a drilling device compris ⁇ ing a drilling head equipped with a rotating body through which runs a duct for supplying air and water or either drilling fluid and bearing at least one rotating cutting elemen .
• Each cone is retained radially by a shaft on which is mounted a ball bearing retaining the cone axially.
• great pressure must be exerted to break the rock and subsequently cut it up and clear it away.
• the working surface is large and great weight must be brought to bear on the drilling head to obtain the necessary pressure.
• the ground undergoes great compression which has the effect of breaking the rock, especially in the case- of a rock cracked, over a radially more extensive surface than that of the drilling, thus creating an irregular drilling profile and an unstable wall.
• the continuous injection of any drilling fluid into the bottom of the hole ensures the evacuation of the excavat ⁇ ed ground and rock cut up by the three cones.
• the diame ⁇ ter of the surface of the bottom of the hole is approxi ⁇ mately the same as the diameter of the drilling head and the evacuation of excavated ground is only ensured if their dimensions allow them to pass between the periphery of the head and the wall of the hole.
• the pieces of rock must therefore be broken up until they can pass between the wall of the hole and the periphery of the drilling head, slowing up the progress of the drilling and allow- ing fine particles of the excavated rock conveyed by the drilling fluid to reach the drill bit bearings, so destroy ⁇ ing them.
• the invention aims to make it possible to produce a drilling device operating at low power, the cutting ele ⁇ ment being easily mounted on the drilling head and enabl ⁇ ing the evacuation of large pieces of debris.
• the drilling device is charac ⁇ terized by the fact that the cutting element is a disc provided with at least a ring-shaped cutting part and that the rotating body bears, on the side opposite to that carrying the rotating shaft of the disc, at least one counter-reacting element and placed so that the said element rests against the drilling wall to centre the drilling head by compensating for the radial component of the reaction of the ground on the disc and to streng- then the wall.
• the counter-reacting element serves to stabilize the drill bit which could tend to oscillate around the drill shaft and to slightly offset the lower point of the cutting * surface in relation to the drilling axis.
• the disc acts on the wall to be cut by a ring- shaped surface equipped with cutting means, the action of the disc is to shear the wall and not to compress it in order to obtain its disintegration. There is certainly a slight compression by the disc at the very bottom of the hole but it is not essential to the working of the device. Moreover, the counter-reacting element resting against the opposite wall allows for centering of the tool and compensates for the radial reaction of the wall which has a tendency to resist the disc. The power needed for drilling is relatively low, the drilling being achie ⁇ ved by shearing and not by compression. In this way one obtains a more stable wall.
• the wall is less likely to give way than when using a conventional dril ⁇ ling head, the cost of installing tubes to prevent the wall from collapsing can be reduced.
• the cutting disc rests only on part of the hole bottom, less than half, and it leaves ample space for the evacuation of large pieces of excavated rock.
• the shaft of the disc is mounted on a hin- ged arm so that the drilling head can be inserted or removed through the tubes.
• the movement of the hinge is around an axis perpendicular to the rotating axis of the drilling head.
• the rotating shaft of the cutting disc is moved, by pivoting the hinged arm, to a position forming an extension of the axis of rotation of the dril ⁇ ling head, the diameter of the tubes being at least equal to that of the disc.
• Elastics pull the rotating _ shaft of the disc back into an inclined position after the drilling head has passed through the tubes.
• the drilling head can be removed for repairs or sharpening without having to remove the tubing which would cause the wall to collapse and the partial reblocking of the hole.
• This device also enables the cutting disc to be changed if, at a certain depth, the type of ground changes, going, for instance, from a layer of sand to a much harder layer. In this way, time is saved.
• the counter-reacting element is mounted on a radially extensible arm.
• the drilling head is equip ⁇ ped with at least two cutting discs placed alternately on either side at regular intervals along the rotating body.
• the dimensions of a cutting disc and/or the length of its rotating shaft are greater than those of the preceding disc and smaller than those of the following disc, going from the lower end to the upper end of the rotating body.
• the lower dril ⁇ ling device which serves only as a guide can be a conven ⁇ tional drill-bit.
• the cutting surface of the disc can be approximately the shape of a truncated cone or a spheri ⁇ cal ring.
• the cutting disc is driven in rotation independently of the rotation of the main shaft, thus increasing its cutting effect which makes it possible both to speed up the drilling work and to diminish further the pressure exerted paral ⁇ lel to the drilling direction.
• the compensating element is a roller having an elliptical section perpendicularly to the drilling axis.
• This roller which actually does not continually roll but rubs against the cut wall, is that it permits automatic centering of the bit even in places where the wall of the hole is cut into more deeply due to the instability of the ground or be- cause a larger piece of rock is cut out.
• the roller is in flexible material and its side surface in a hard material,
• a roller with circular section mounted radially on an extensible arm can be used.
• the counter-reacting element is a simple friction surface mounted on a radial arm.
• the attached diagram shows, as an example, five different versions of the invention.
• Figure 1 is a longitudinal section of one version.
• Figure 2 shows the same version as Figure 1 , the cutting disc and the roller being different.
• Figure 3 is a longitudinal section of a hinged device.
• Figure 4 is a view in plan of the lower part of the preceding Figure.
• Figure 5 is a longitudinal section of the device shown in Figure 3 in the retracted position.
• Figure 6 is a schematic view of a drilling head designed to enlarge an existing boring/drilling.
• Figure 7 is a diagram showing a longitudinal section and profile of a drill bit ' fitted with means for driving the cutting disc in rotation.
• Figure.8 is a view in plan of a compensating roller of a particular shape.
• Figure 9 is a perspective view of a compensating element of a particular shape.
• the drilling head (Fig 1) comprises a rotating body 1 which screws on to the end of a shaft, not shown, driven in rotation.
• the upper * part of the rotating body 1 has a part in the shape of a truncated cone 2 fitted with a thread 3.
• a cylindrical section 4 On the lower part of body 1 is a cylindrical section 4, the axis of which diverges downwards in relation to the axis of rotation of body 1.
• a disc 5 is fixed on the cylindrical part 4.
• the cutting surface of the disc has the shape of a truncated cone or, as shown in Fig.1, it is composed of two opposed truncated surfaces 6 and 7.
• the ring-shaped surface 7 is equipped with cutting con ⁇ trivances.
• the cylindrical part 4 serving as a rotating axis for the disc 5 is fitted with a ball-bearing 8 facilitating the rotation of disc 5.
• a shoulder 9 of the cylindrical part 4 serves as a thrust bearing for the disc and can also be fitted with a ball bearing 10.
• a nut 12 attaches the disc 5 on its shaft 4, a sealing lining 11 protecting the ball bearing 8 is placed between the nut 12 and the ball bearing 8.
• a roller on shaft 14 parallel to the axis of rotation of the drilling head is mounted between two horizontal plates 15 and 16 forming part of body 1.
• Generants 17 and 7 of the roller 13 and the disc 5, the furthest from the axis of rotation of the device, are diametrically opposed. It is possible to equip the device with other rollers placed at an angle or axially.
• a duct 18 runs through body 1 and out through a hole 19 in the drilled hole. The duct 18 serves to convey air, water or mud to the bottom of the hole to lubricate and cool the disc and to evacuate the excava ⁇ ted rock.
• the shaft 4 of disc 5 can also have a branch from duct 18 running through it and opening through a hole in nut 12. In this way, one obtains better cooling of the valid ball bearings 8 and the thrust bearing 10.
• the working surface of the disc can be fitted with ducts through which liquid is e ected under high pressure on to the surface to be cut. Depending on the nature of the ground-, this liquid penetrates the wall and facilitates cutting. Drilling is carried out as follows: The body 1 is driven in rotation in the conventional way and a slight load is exerted on the drilling head.
• the side surface of disc 5, being equipped with teeth or being simply sharpened depending on the type of ground, shears the ground and creates a hole, the bottom of which has an axial section with an approximately parabolic profile 20.
• each point of the wall is cut out under the effect of a force perceptibly perpendicular to the axis of rotation of the drilling head and at a tan ⁇ gent to the wall 20 and a force perpendicular to the ro- tating shaft 4 of the disc 5.
• These forces are due respec ⁇ tively to the rotation of the drilling head and to the free rotation of the disc 5.
• the version illustrated in Fig.2 differs from the preced- ing version only in the shape of the roller and of the cutting surface.
• roller 13* has the shape of a truncated pa ⁇ raboloid to coincide with the wall at the bottom of the hole. Obviously, this same roller could replace roller
• the side surface 7 of the disc is in the shape of a spherical ring.
• the cutting surface being in contact with the wall has a maximum diameter which can be defined on this Figure by the length of the segment connecting points 21' and 22'.
• Point 22' and point 17' of the roller can be at the same level, the position of the roller relative to the disc should be such that the bit remains in equilibrium dur ⁇ ing drilling, in other words that it does not oscillate around the drill shaft.
• Point 17' being the highest point of the roller 13 in contact with the wall. It seems that the optimum length of the greatest diameter of the cutting surface is that corresponding to the length of the side of an equilateral triangle inscribed in a circle having the same diameter as the drilling diameter. This length is represented on Figs. and 2 by segments 21-22, respectively 21 *-22 ⁇ .
• the rounded shapes both of the roller and ' its support and of the cutting disc facilitate the withdrawal of the bit.
• the shaft 28 of disc 29 is part of an arm 30 hinged around a shaft 31 perpendicular to the axis of rotation of the drilling head.
• Shaft 31 is mounted on a rotating cylindrical body 32 through which runs a duct 33 opening into the shaft 31 which is hollow.
• On the side of shaft 31 are two holes 34 and 34' (Fig.4) opening into duct 33 by a bent tube (not shown) forming an inverted ⁇ , the extremities of the ⁇ being connected to the two holes 34 and 34' and the base of the ⁇ , which is equipped with a hole, to duct 33.
• the articulated arm 30 has a cylindrical head through which passes shaft 31. On part of its side surface the head has a cylindrical tenon 39. The upper part of the head of arm 30 is lodged in a housing cor- responding to the rotating body 32.
• a roller 24 mounted on a radially exten ⁇ sible arm 25 rolls either against the wall of the drilled hole or against the inner wall of tubing 27. Its main purpose is to act as a counter-balance to the reaction of the ground to disc 29 and to centre the device. It also strenghthens the wall of the hole if it rolls outside the tubing 27.
• the extensible arm 25 is in retracted position to allow the device to pass through the tubing.
• Arm 25 can be a hydraulic jack.
• the roller should be at the same level as the upper part of the cutting surface of the disc or even lower to ensu ⁇ re the stability of the drill bit.
• Fig.6 shows schematically a variation on the design allow ⁇ ing for the enlargement of the diameter of a hole 44 made by a drilling device corresponding to the bit describ ⁇ ed above of by another conventional means.
• the device shown have three cutting disc 45,46,47 placed at intervals and alternately on either side of the rotat ⁇ ing body.
• the diameter of the lower disc 45 is smaller than that of the second disc 46 which, in turn, is smal ⁇ ler than that of the third disc 47.
• the rotating body supporting the three rotating shafts 51 to 53 of the cutting discs 45 to 47 can be made of a single piece but this design has the disadvantage of rigidity of use and especially in case of breakdown of one of the discs, the whole drilling head must be changed.
• each cutting disc 45 to 47 is mounted on its own drill shaft 48 to 50.
• the lower drilling element corresponds to the device in Fig.1 and we will not describe it again.
• the shaft 49 which bears the disc 46 is attached on top of shaft 48 in such a way that the discs 45 and 46 are on opposite sides of the new shaft so obtained.
• the two shafts 48 and 49 must be attached by a bayonet or other system.
• the third shaft 50 is mounted on the second 49 in the same way but, this time, the cutting disc 47 is placed on the same side of the drill shaft as the first.
• Each of the rotating bodies is equipped with an axial duct 54 for the passage of cooling fluids and for evacuat- ing excavated rock.
• the axial ducts open into another and each has two branches, one running axially through the rotating shaft of the corresponding cutting disc (not shown) , the other opening radially on to the side of the drill shaft.
• the first drilling element serves only as a guide and counter-balance to the second, and so on.
• the first drilling element can be a conventional drill-bit having served to drill the hole 44.
• the axial distance between two cutting discs should be limited.
• the drilling device described can be used for any sort of vertical, oblique or horizontal drilling in search of water, oil or form mining exploration and exploitation.
• a small amount of power being sufficient to operate the described device, it is very economic in use for under ⁇ water drilling where it is necessary to drill through layers of widely differing hardness, ranging from sand to the hardest rock.
• It can be used to good advantage in the build ⁇ ing of tunnels.
• the bearings are used only to faci ⁇ litate the rotation of the disc, they can be ball, roller or needle bearings. They are mounted in such a way as to be water-tight which results in prolonging their life.
• the cutting surface can be either a hard surface or equipped with teeth made from diamond, tungsten carbide or other substances, their choice being dictated by the type of ground to be drilled.
• the speed at which the disc rotates around its shafts depends on the speed of rotation of the shaft of the drilling device ' on which the drill bit is fixed and on the vectorial resultant of the forces exertes on the surface of the disc.
• This de ⁇ pendence reduces the cutting action of the disc and pro ⁇ longs working time and also causes assymetrical wear of the cutting disc.
• the version in Fig.6 enables these disadvantages to be remedied.
• the drill bit comprises a rotating body 101 screwed to the end of .the shaft 102 bearing a motor unit 103.
• a cut ⁇ ting disc 105 illustrated altogether diagrammatically, is mounted on an oblique shaft 104 housed in an oblique part 106 of the rotating body 101.
• a roller 108 is fitted on the side diametrically opposed to the oblique part 106 of the rotating body, its shaft 109 being borne by two parallel arms 110 and 111.
• the disc 105 is kinematically connected to the motor 103 by the intermediary of two spindles 104 and 112 each fitted at one end with a bevel gear 113 and 1 4 respectively, the two gears 113 and 114 being connected by a toothed wheel 115.
• the drive shaft 112 independently of the rotation of shaft 102 drives the toothed wheel 115 in rotation which transmits motion to the spindle 104 which makes the disc 105 turn and which cuts into the wall 116 of the hole.
• the motor unit 103 can be a turbine driven by the liquid circulating inside a duct, not shown, of the shaft 102 and of the rotating body . 101 intended for the evacuation of debris or any other kind of motor.
• the speed of rotation of the disc 105 being independent of the speed of rotation of the shaft, less pressure needs to be exerted on the bit.
• the cutting disc 105 works like a circular saw or a cutter, the main cutting effort being supplied by the disc's own rotation, According to the type of ground, the cutting disc is fitted with teeth made of diamond, tungsten or other hard material.
• a machine can be produced for horizontal drilling, to extract coal for example.
• the es ⁇ sential difference is that tunnels drilled for mining, exploitation have a far greater diameter. All that needs to be done in such cases is to mount on the existing spindle of a tunnel drilling machine a rotating body whose oblique part is much longer than the oblique part 106 of the body 101 of Fig.7 as well as the arm or arms bearing the compensating roller.
• the oblique part of the rotating body being longer, a motor for driving the disc can be fitted directly on to this part of the rotating body.
• the operation of such a device is the same except in dimensions as that of the device in Fig.7.
• the roller can be mounted on an extending arm.
• Another solution is to use a roller whose section perpen ⁇ dicularly to the drilling axis is elliptical (Fig.8).
• the roller represented in Fig.8 is formed of an elliptical ring 120 in hard material such as tungsten surrounding a core 121 made of another material, for instance rubber. Through this core 121 is a cylindrical hole 122 allowing for the passage of shaft 109 of the roller 108.
• This roller is designed to rub against the wall and to roll only where there is an irregularity in the wall until the disc 105 is in contact with the wall 116 of the hole.
• the roller 108 rubs against the wall of the drilling hole with part of its side surface which is nearest to shaft 122 of the roller. As soon as the roller is no longer in contact with the wall because of an irregularity (hole) in the wall, the bit is de-centred under the effect of the reaction of the wall on the cutting disc 105. The roller then comes into contact wit the wall and starts rolling until the cutting disc 105 is brought into contact with the wall.
• the variation in hole diameter must correspond to the difference in length between the half-small and the half-large axis of the ellipse in order to ensure efficient operation of the device. The roller returns to its original position as soon as the variation in the drilling diameter has been eliminated.
• the friction surface can be the side surface of an approximately cylindrical or prismatic- guide fixed element. When the part of its surface in contact with the wall of the drilled hole has worn down, it can be turned so that an unworn part of the side sur ⁇ face faces the wall of the hole.
• Such an element-guide 130 is shown in Fig.9. It consists of a prism, the edges and its side surface being rounded. The side surface can be fitted with flexible teeth to absorb the variations in the wall of the drilled hole.
• Element 130 is fixed and set parallel to the drilling shaft so that one of its side surfaces (or edges) is facing the wall of the hole. When this face or edge is worn, element 130 can be turned and one of the other surfaces or edges brought forward.
• This non rotating upper compensating guide which in ef ⁇ fect is a pre-set (to one of a number of positions) cur ⁇ ved surface able to touch against the side of the hole as cut by the lower disc.
• the compensating guide can be set to act only on the vertical wall of the hole or can be set at a lower level to impinge on the upper end of the curved base to the hole.
• the main objective of the upper compensating guide is to ensure that the lower disc is seated particularly at the start of any hole at a po- sition causing a trench eccentric from the centre line of the hole.

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• 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)
• Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
• Processing Of Stones Or Stones Resemblance Materials (AREA)
• Control And Other Processes For Unpacking Of Materials (AREA)

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Citations (16)

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• 1982
  • 1982-07-26 BR BR8207803A patent/BR8207803A/pt unknown
  • 1982-07-26 WO PCT/EP1982/000158 patent/WO1983000524A1/en active Application Filing
  • 1982-07-26 DE DE8282200977T patent/DE3271141D1/de not_active Expired
  • 1982-07-26 AU AU88203/82A patent/AU548365B2/en not_active Ceased
  • 1982-07-26 EP EP82200977A patent/EP0072072B1/fr not_active Expired
  • 1982-07-26 JP JP57502471A patent/JPS58501240A/ja active Granted
  • 1982-07-26 US US06/486,540 patent/US4549614A/en not_active Expired - Lifetime
  • 1982-08-02 IN IN591/DEL/82A patent/IN159061B/en unknown
  • 1982-08-03 IL IL66456A patent/IL66456A/xx unknown
  • 1982-08-03 CA CA000408603A patent/CA1189060A/en not_active Expired
  • 1982-08-04 AR AR290211A patent/AR228513A1/es active
  • 1982-08-05 TR TR21508A patent/TR21508A/xx unknown
  • 1982-08-06 ES ES514797A patent/ES514797A0/es active Granted
  • 1982-08-06 PT PT75391A patent/PT75391B/pt unknown
  • 1982-08-06 GR GR68974A patent/GR77216B/el unknown
  • 1982-08-06 KR KR1019820003553A patent/KR840001296A/ko not_active Ceased
  • 1982-08-06 OA OA57769A patent/OA07177A/xx unknown
  • 1982-08-06 CS CS825870A patent/CS266311B2/cs unknown
  • 1982-08-06 IE IE1909/82A patent/IE53075B1/en unknown
• 1983
  • 1983-04-06 NO NO831219A patent/NO831219L/no unknown
  • 1983-04-06 DK DK1527/83A patent/DK152783D0/da not_active IP Right Cessation
  • 1983-04-06 SU SU833573201A patent/SU1496639A3/ru active

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