DE2048519A1 - Em and extendable drilling jig - Google Patents

Description

a I ¹ Tp ¹ : ¹ : τ ■; ■■. fs ».» - ..

PATENT LAWYERS

DIPL.-INe.OR.IUR. DIPL-IN (J-. ÄU.HÖO | v3

VOLKER BUSSE DIETRICH BUSSE

45 Osnabrück, October 1, 1970

MOSERSTRASSE 2Ο / 24 VB / St.

Christensen JDiamond Products ^ Company 1937 _South Second West Strebet, _ Salt Lake City Utah 84110, U.S.A.

Retractable and retractable drilling device

The invention relates to drill bits for Drilling of boreholes' at clearing forinations and concerns in whether he; on the * a drill with a.tn

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Cutting and aligning mechanism that is provided by a drill string extending to the drilling rig or rig running and in position in a spindle or body at the lower end of the drill string can be locked, the cutting tools being retractable from their locked position and by the The drill string can be pulled up or lifted to the drill frame. An example of such a drilling device results from U.S. Patent 3,437,159.

The usual method of drilling a borehole is to attach a drill bit to the lower end of a drill string, rotate the drill string while applying drilling weight to the drill bit, and direct drilling fluid through the drill line to remove the cutting "chips" from the drill base and flush it up, around the drill pipe, to the top of the borehole or rig. Venn der-Bohror due to wear and tear * betw. Blunting or for inj

inspection is to be removed from the .Bohrloch, it is necessary to ramp don entire Bohrleitungsstrang from the borehole and the drill either replace or retract it back into the wellbore,

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QRH31NÄL

which takes considerable time with ~

greater depth of the borehole increases, and with considerable Cost is associated. The known devices for moving the scimoid elements through the drilling line and removing them from the strand on a wire rope. The like. Avoid the need to pull up the drilling line for replacement or inspecting the drills, however, for a variety of reasons including: because of the relatively small size; the cutting tools, the difficulty of properly aligning the cutting tools with the lower end of the drilling pipe at which the cutting tools are locked, loosening and lifting the cutting tools when pulled out through the drill string to the drill rig and the through the manufacture of the Tooling costs have been found to be uneconomical.

The drilling device according to the invention is mainly characterized characterized by an outer tube which can be fastened to the drill string and which has a drive spindle. by a cutting device consisting of a plurality of push-out and retractable cutting tools, one of these te'leskcpartig holding carrier, interengaging with each other Coupling links on the spindle and on the cutting tools for ι

Attaching the latter to the spindle in the pushed-out position; as well as interengaging alignment parts on the cutter and the outer tube for aligning the cutting | tools for simultaneous lateral pushing out in the state coupled with ι r.er spindle, with the Träper down to; Cutting device can be moved into a position in which the I

1 0 9 8 1 8/1 b 7 0

8AÖ

Cutting tools in the pushed out and with the Spindle coupled state are kept.

The invention thus provides an improved drill before, in which the cutting tools can be retracted by a Bohrleitungsstrang and locked at a entsprochenden drive part, which is fixed to the lower end of the drill string and also achieved a high pulling the drill rig from the drive member, and wherein the mechanism for this is easier than before and can be easily aligned with counter slots in the drive, into which the cutting tools have to push themselves and in which they are locked in their outwardly pushed state with the drive part both in a safe torque and in a fixed drilling weight transmission ratio. The cutting tools that can traverse the drill string when it is raised or lowered j have relatively large cutting surfaces and therefore a longer effective cutting time. The mechanism as a whole is of strong and robust construction. The cutting tools are conveyed through the drill string by a support tube or similar device, the support tube also being

- '■ ι

if this is used, the cutting tools in the outwardly pressed!

i state to lock firmly with the drive, and also a ge-t

■ ''. ■ 'i

suitable inner core tube can carry in the event that the j Cutting tools are intended to cut a core in the wellbore formation that is to & f.mmen with the cutting tools through the drill string can be pulled up to the derrick.

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2043519

Further features, advantages and possible uses of the invention emerge from the claims and the description in conjunction with the drawing, in which several embodiments & piele of the subject matter of the invention are illustrated in more detail In the drawing:

Fig. La to Id a complete longitudinal section, partially

also in view, through a drill string, a drive spindle and a retractable drilling device, in which certain drilling parts are in a position in which the device can traverse the drill string, Fig. Ib, Ic and Id lower continuations of the Figures la, Ib and Ic are respectively;

2a to? .D views corresponding to FIGS. 1a to 1d,

in which the drilling part of the device is shown in its locked position in the drilling state with Figures 2b, 2c and 2d being lower continuations of Figures 2a, 2b and 2c, respectively;

3 shows a cross section along line 3-3 in FIG. Id;

Fig. Ι a cross section along line 'J-4 in Fig. 2d;

FIG. 5 shows a bottom view of FIG. 1d;

FIG. 6 shows a view from below of FIG. 2d;

Figure 7 is an ochomatic view of a cam bushing

and from one piece with this consist in the support rods, shown / developed in

one level;

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BAD ORIGtNAk

Ao: ./ Ί

Pig. 8th

Pig. 9

Pig. 10

Pig. 11

Pig. 12th

Pig..13 Fig. 14 Pig. 15th

a schematic view of a drive spindle, shown in Aowwicklung in one plane; an enlarged partial longitudinal section with the inlet ratio of the guide drill bit and the support rod, if both are in the Pig. Id illustrated Position;

a longitudinal section through a modified embodiment of a retractable drilling device with associated drive spindle in a position in which the drilling device is raised in the drill string or can be pulled up; a representation similar to FIG. 10, in which the drilling device is in the locked drilling state with respect to the drive spindle;

a side view of the lower part of the device shown in Fig. 11; a bottom view of Fig. 10; a bottom view of FIG. 11;

a longitudinal section through the drive spindle of the modified device.

A fit

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"ORtQiNAl fNSPECTED

The device shown in Fig. 1 and 9 has a retractable PrilIböhrereinsatζ A, which can be raised and lowered by a, to a (not shown) extending tubular drill string B, through which a torque is transmitted through the device when drilling weight is applied will. The lower extension 10 of the tubular drill string B is firmly screwed to a locking coupling intermediate part 11, which in turn is fastened by screwing to an outer tube 12 of the required length, the lower end of which is screwed onto an intermediate piece 13, in turn with the upper part of a Drive spindle or a drive body lh is screwed, which has a plurality of slots 15 which are spaced from one another over its circumference and which are open at the lower end 16 of the drive body 14. Each slot 15 is delimited by lateral, outwardly tapering or converging side walls 15 (FIG. 6) and by an upper surface 17 which is inclined obliquely towards the bottom and the outside (FIG. Id, 2d).

The drill bit bit A is lifted by the drill string and lowered for locking or coupling with the drive mandrel 14 by means of a support tube 18, which consists of a required number of screwed together tube sections j consists; that under «=? The end of the support tube 18 has an end - ι part or drill bit 19 screwed over its circumference

spaced apart, laterally extending:

ι Drive wedges? 0, each in longitudinal slots 21 j

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a flat one. Slide support rod 22, which hang down from an upper alignment cam bushing 23 and are attached to this. exist in one piece. The cam bushing 23 is provided with downwardly converging, V-shaped cams 2h , which have beveled cam surfaces 25 for cooperation with corresponding cam surfaces 27 on symmetrically upwardly extending, axial cam teeth 26 which are located on the upper end of the drive spindle I ¹ J are located.

The lower end 28 of each support rod 22 is fitted into an inner recess 29 of a plastic chuck or cutting tool 30 and firmly connected to this in a suitable manner, e.g. by welding or brazing. The drill chuck or cutting segment is on both its outer meat cutting surface 32 and on its downwardly and inwardly sloping surface 33 and the same on its end face 34 with embedded diamond cutting elements 31 provided for cutting the borehole. The upper end 35 of each chuck is downwardly and outwardly beveled so that it fits the bevel of the upper end.

, r

17 of the slot 15 is adapted 'into which it is moved I and with which it can engage. Furthermore, each drill chuck is provided with an inwardly extending foot 36,. the one with the lower end 37 of the end part or Leit-Bohr - a j sentence \ 19 can intervene. The sides 38 of each foot 36 |

are beveled to match the beveled sides 16 of the Slits 15 to come into engagement and with these coincide with j

are correct when they are fully immersed in the-ever. j

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2043519

The drive keys 20 are up along the support bar slots 21 to the upper part of the alignment cam book 24 displaceable. The support bars consist, as described above, " from one piece with the alignment cam bushing and are laterally bendable to this by the provision of slots 39 on each side of the upper part of each rod, which separate the rod from the main part of the socket itself (Fig. 7). Each pole is attached to it in a suitable manner attached outer cam plate 40, which has cam surfaces 41, the continuations of the alignment cam socket surfaces 25 form. Each support rod is also provided with a lateral, inwardly directed stop shoulder 42, which with a downward opposing shoulder 43 on the pilot drill bit or end portion 19 engages as the device passes through drill string B as described below and is lowered in the outer tube 11, 12, 13 of the drilling device (Fig. Id, 2d, 7, 9).

The upper end of the support tube 18 is provided with an outer housing a swivel joint 46 screwed in a suitable form. As can be seen, the hinge includes an inwardly directed one Housing flange 47, against which upper and lower bearings 48, support, the lower bearing on an upwardly directed shoulder 50 on a journal 51 and the upper bearing a nut 52 rests on the upper end of the journal 51 is screwed on. An inner core tube or hollow

toil 53 is at its upper end with the bearing pin 51 connected i - ^ "- ^{: i} 109816/1570

204 ^; , -j 19

- ίο - ·

screws and has the desired length to accommodate a through the cutting tools 30 produced core, the lower end of the core tube is screwed to a shoe 54, the one has inner beveled surface 55 which cooperates with a suitable core lifter or gripper 56 around the core to hold or grasp in the inner hollow part or tube. When the core is formed in the tube, liquid may be present therein pass upward through a valve seat 57 which is fitted through a groove 59 in the bearing pin lower jump or spring ring 58 is secured. A ball valve 60 is arranged on the valve seat in a channel 6l in the bearing journal and can be moved upwards by liquid, so that liquid can pass through the valve seat and exit through an opening 62 in the bearing journal, on the other hand the ball valve in the event of a liquid pressure flow moved down and on the valve seat 57 locking to the plant komrrt.

The outer housing 45 of the swivel joint 46 is provided with an intermediate, part 63 firmly screwed, which in turn is screwed into a locking body 64, these parts by means of a Lock nut 65 are firmly connected to each other by screwing the latter onto the intermediate part 63 and against the lower End of the locking body 64 is applied. The latch body is on its circumference with spaced centering flights Provided in 66 in order to center the locking body within the intermediate part 11 of the outer tube of the device!

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The intermediate part 11 has a locking recess 67 its inner circumference, which can accommodate laterally displaceable bolt 68, which is in a transverse slot 69 in the bolt body are movable. The latches are made by helical compression springs 70 pushed outwards between the opposite Directional latches 68 act to bring them to snap into the latch recess 67 when they are aligned with it.

The retraction of the bolt 68 from the recess 67 is made possible by the upward movement of a retractor bar 71, the * in the longitudinal direction in the bolt body 6 1 slidably and transmits retracting pins 72, which are arranged in slots 73 in the latches and with bevelled ¹ ^ ockenflachen 7 ^ can come into engagement, each forming one side of each slot 73. The retraction rod 71 is moved upwards to retract the bolt from the bolt recess 67, in that a suitable cover (not shown) comes into engagement with a retraction head 75 which is fastened to the retraction rod by a screw connection 76 or the like. The locking mechanism as such is not part of the present invention. A similar: retraction mechanism is in the above-mentioned US Patent 3 ** 37 15s! shown and described.

The drive spindle or body lH ict with in the longitudinal direction;

i provided running inner grooves 77 that extend through its!

open the upper end and downward in its slots 15 from j

run, with each groove having the same center line as the ■

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V-shaped space defined by the lead screw cam teeth 26 and slots 15 (Fig. 8). On the other hand, the Fittellinip, the support rods 22 are aligned with those of the V-shaped cam teeth 40, 24, which are attached to the alignment camshaft 23 and consist of one piece with it; In addition, the center line of the support rods 22 is centric with respect to the drill chuck 30 (Fig. Id u. 7). Assuming that the alignment cam bushing 23 with drill chucks 30 attached to the support rods 22 is fully engaged with the cam teeth 26 of the drive spindle with its teeth 40, 24, the rods 22 are aligned with the longitudinal grooves 77 and the drill chucks 30 are on the Slots 15 aligned, whereby a leaning out of the support rods 22 in the longitudinal grooves 77 and the drill chuck 30 in the slots 15 is made possible.

It is assumed that, in operation, the illustrated in FIGS. 1 to 9; th device, the drill string B with the outer tube 11, 12, and the drive spindle 14 attached to it is arranged in a borehole such that the lower end of the drive spindle is a short distance above the bottom of the borehole ° s. The drilling mechanism A with the drill chucks or cutting tools 30 in the retracted position and in the relationship shown in FIGS lie, as i make this possible by the bending of the support rods 22 inward.! light, which hold the attached cam teeth 40 in 'a laterally inwardly directed position. While '■

SAD ORIGINAL

Such a lowering movement of the drilling device brings the laterally inwardly directed position of the support rods 22 their shoulders 42 under the downwardly facing counter shoulder 43 on the guide drill insert or support part 19, with the Koile 20, as shown in Fig. Id, in the upper part of the slots 21 lying. So the weight of the device is above the Leit-Bohreinssatzes 19 over its shoulder 43 on the support rods 22 transferred and presses this and the drill chuck 30 nacl; down through the drill string.

When the drive spindle 14 is reached, the drill chucks 30 move into it and the posterior teeth 40 move into the support rods and the cam teeth 24 on the alignment cam sleeve 23 then mate with counter-cam teeth 26 on the lead screw engaged to ε-although the cam bushing 23, the support rods 22 and to rotate the chucks 30 as well as the support tube 18 rotatably attached thereto by the wedges 20 into a position in which the support rods 22 den Längr.nuten 77 and the chuck 30 den Slots 15 are opposite, while at the same time the cam teeth 40, which are located on the outer surfaces of the support rods 22 are attached, a downwardly and outwardly sloping inner wall 80 of the intermediate part 13 are opposite, the so one Forms recess into which the cam teeth 40 can expand, whereby the support rods 22 are fully inserted into the longitudinal grooves 77 and the chuck 30 can fully expand into the drive spindle slots. The expansion of the cam teeth 40 outward in the atu; p.orspavfcen area of the intermediate part 13 pulls the

"J.098JJ3 / 1510

BATH ORIGINAL

- i4 -

rod shoulders 42 under the shoulder 43 of the guide drill insert, whereby the support tube 18, the core tube 53 located in this and the locking mechanism 63 to 75 above it can move downwards by sliding the wedges 20 in the slots until the guide drill insert 19 assumes its lowest position, in which its end 37 comes to rest with the beveled inner surfaces 81 of the drill chuck and the beveled stop shoulder 82 on the drive spindle 14. At this point, the outer longitudinal surface 83 of the Leitj drill bit is located behind the inner longitudinal surfaces 84 of the rods and hold the drill chucks 30 in close contact with the drive spindle 14, with the upper surfaces 35 of the drill chucks resting against the chamfered surfaces 17 of the drive spindle and the chamfered ones Pages 38 of the chuck cling tightly to the sloping opposite sides l6 of the slots 15. At this point in time, the free cutting surfaces 32 of the drill chuck lie laterally outside the periphery of the drive spindle 14, while the twist surfaces 33, 34 of the drill chuck lie below the lower end 16 of the drive spindle and also laterally outside the beveled lower surface 16 ^{1 of} the drive spindle (Fig. 2d, 6).

The drive spindle 14 and the drill chuck 30 form an inlet opening 85, in which a core formed by the cutting tools 30 move upward into the core tube 53 can. It is. but the support or Leitüäl 1? as a drill: in use designed to be the diameter of the chuck

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-2O4 & 54-9-

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formed core to reduce entry into the core tube. to this purpose is the Leit-Bohreinsatü both on its inner Price cutting surface 86 as well as on its end face 87 with Diamond cutting elements 31-i provided to an S with no id operation perform in formation.

When the support tube 18, as shown in Fig. 2a to 2d, its has reached the lowest position within the outer tube, the bolts 68 are on the recesses 67 in the intermediate part 11 aligned, the springs 70 pushing the latches outwards and thereby the parts in their illustrated in FIGS. 2a to 2d hold each other's position.

The drill string B is rotated at the desired speed and there will be such a Bohrp.ewicht on the drill string attached drilling part of the device applied that both de chucks or cutting tools 30 and the guide drill bit 19 penetrate the soil formation. During this process, drilling fluid is drawn down through the drill string guided, with it around the outside of the bolt body 6 * 1 around and through the annular space 88 between the door tube 18 and the outer shell 11, 12 to dom lower part of the support tube where it runs inwards through one or more drainage openings or through-

\
let 89 flow into the annular space 90 between the support tube and the inner core tube 53, through this space and the spaces 91 formed between the guide drill bit 19 and the shoe 5 ^ (Fig. Id, 3 and H) and then in the A-

109816/1570

OTBGlNAL INSPECTED

-. "_. 24M.a5.-t9 -

opening of the guide drill bit flows and both the Cutting "chips" removed from the drill base * »as well as the guide drill bit 19 and the drill chuck 30 cleans and the cutting "chips" flushes laterally outwards, around them outside around the outer pipe 1 * 1, 13, 12, 11 and the drill string B to the drill rig? to transport.

During the drilling process, the drilling ^{weight is applied directly from the drive spindle I 1} J through the shoulders 17 to the drill chuck 30, while the torque is transmitted directly from the sides 16 of the drive spindle slots 15 to the drill chuck 30. Due to the presence of the pivot joint 46, all parts except the inner core tube 53 and its associated parts rotate, the core moving upwardly into the core tube 53 as the annular portion of the borehole progressively cuts.

If removal of the core is desired, a suitable cover is lowered through the drill string B on a wire rope and coupled to the head 75. The wire rope is then raised;

sucked, whereby the retraction rod 71 is raised and the retraction rods 7Z are caused to come into engagement with the inclined cam surfaces 7h and the latches 68 laterally | to pull inward out of the recess 67, whereupon the j

Pulling up the wire rope is continued. Such a J

Pulling up lifts the support tube 18 and the core tube 53 upwards ₍

and causes the gripper 56 to engage the core:

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“AD

come and break it off from the bottom of the hole. The uplift of the support tube 18 moves the guide drill bit 19 upwards from its position behind the drill chucks or cutting tools 30, the wedges 20 sliding upward in the slots 21 until they reach the upper ends 21a of the slots 21 Reach whereupon they raise the alignment cam lugs 23 and the support rods 22 and pulling the latter up onto the Drill chuck 30 is transferred, which, made possible by the flexibility of the support rods 22, of the inclined shoulders 17, 35 are moved inward, whereupon the parts are then in a state for complete withdrawal from the drive spindle 14, the outer cylinder 11, 12, 13 and the drill string B? Ur borehole surface are there. During this upward movement, the core gripper 56 has accordingly downward against the beveled surface 55 of the shoe 5 ^ moves and is inwardly wedged into tight engagement with the core to prevent it from falling out of the core tube 53.

The core can be removed from the drilling rig and the individual parts of the device can be checked. Provided there is no wear and tear the same device including the drill chuck 30 | and the drill bit 19 then through the drill string B again lowered and the prescribed work cycle repeated will.

The embodiment shown in FIGS. 10 to 15 of the The invention corresponds essentially to the above besohriebo-i

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BATH ORIGINAL

nen. However, modifications have been made to the spindle cam? 6a and the drill chucks or cutting tools 30a made by increasing their circumference and lateral dimension by to create a much larger cutting area to act on the bottom fermation and also the need to avoid using a pilot drill bit to cut the interior portion of the formation cuts within the chuck, as is the case with the other embodiment of the invention. aside from that instead of a guide drilling insert, a drive and support foot 19a is provided which has the drive wedges 20a shown in FIG the longitudinal slots 21 of the support rods 22 and the alignment cam bushing 23 slide. The slots 15a of the spindle l * Ja are wider than in the other embodiment of the invention by they have a lower region 15b with sides 16a, 16b which are laterally bevelled outwards to one another, the legs 100 lying in between delimit the spindle slots 15a. Each leg has a vovdere drive surface 16b, the for torque transmission can come into engagement with a mating surface 38a of a drill chuck, and is still with a Provided lower back part l6a, which is arranged at a distance from the upper, beveled end 17 of the slot and with the lower front face 38b of the drill chuck can be engaged, the drill chuck having an upper front region 30c

which overlaps the end portion 100a of the leg and fits into an upper extension 15c of the slot. Everyone? The shape of the drill chuck 30a is matched to the slot 15a and has an end face 105 which is

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8ADORiGlNAL

running surface 106 merges, which in turn merges into a free tendon idf surface 107 of the drill chuck, the free cutting surface extending from the drive or Voröerfläche 1.6b of the slot 15a to the opposite end of the offset slot area 15c. When the cutting tools 30a are located in the spindle slots 15a, depending in the circumferential direction at a distance from one another, depending lugs 108 extend on the support tube foot 19a between the lower areas of the drill chuck 30a, with the lower ends of the lugs above the end faces 105 the chuck lie. The chucks are further provided with inner cutting surfaces 110 which extend radially inwardly over the inner surfaces of the lugs 108 and the entry opening 111 of the drive foot and thus determine the outer diameter of the core produced. The . Surfaces 105, 106, 107, 110 of each Bohi chuck are provided with inserted diamond cutting elements 31.

The lower ends 28 of the support rods 22 are attached to the inner regions of the drill chucks 30a in the same way as in the case of the other embodiment of the invention, the alignment cam bushing 23 and the cam teeth k0 on the support rods 22 being the same as those of the other embodiment and with the spindle cam surfaces 27 can work together in the same way in order to align the support rods 22 and the drill chuck 30a with the spindle grooves 77 and the spindle slots 15a.

ten. When the cam teeth 26a, ^J 10, 2k are fully engaged, j

the carrier 18 and its drive, foot lpa together with demj

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—-- 2-Θ-48-549 "

inner core tube 53 with the mechanism above lowered to bring the support tube and its drive foot 19a into their lowest position (Fig. 11), in which the drive foot 19a is behind the chucks or cutting tools 30a and its lugs 108 between the lower areas the chucks or cutting tools are arranged. The drive foot 19a has a forehead catch 115 between its lugs 108, which comes to rest on upwardly directed transverse surfaces 116 on the cutting tools and thereby firmly locks the drill chuck 30a in its outwardly pressed position, in which its upper beveled end surfaces 35 abut the upper beveled end surfaces 17 of the spindle slots 15a and in which the rear side of each drill chuck comes to rest with the side l6b of its counter slot, the offset areas 30c of the chucks being arranged within the offset areas 15c of the slots. The lower front side 38b of each drill chuck is in contact with the opposite end 16a 'les associated slot and also lies close to a drive attachment 108 (FIG. 13, I ¹ *). At this time, the lower drilling surfaces are 105 of the chuck below the lower end of the spindle l ^J la and the drive lugs 103 while the tapered surfaces 106 of the drill chuck and the cutting surfaces 107 outside of the corresponding faces of the drive spindle are 15a.

If the device is to be lifted or withdrawn from> the drive SpinnC'l 1 ^ a and the outer tube 11, 12, 13 is the

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Head 75 j eberso as in the other embodiment of the invention, pulled up by a sleeve or rod wedge catcher connected to a wire rope in order to pull the bolt 68 out of its bolt recess 67 and to lift the core tube 53 and the support tube 18 until the drive . Drive wedges 20a come into engagement with the Aasricht-Noeken bushing? 3 at the upper end of the slots 21, the drive foot 19a also having been raised by the drill chuck 30a. The upward movement of the 3 support tube or The drive foot 19a then causes the Noeken bushing 23 and its arms or support rods 22 to loosen in order to press the drill chuck 30a upwards, the latter being moved inward by mutual engagement of their upper inclined surfaces 35 with the inclined surfaces 17 of the spindle slots. As a result of the essentially arcuate extension of the drill chuck ^ Oa and their overlap ratio in the retracted position (Pig. 12), it is necessary to turn them in such a way that the areas sliding along the inner wall of the drive spindle 14a are aligned with the spindle dimensions. Accordingly, the spindle has a wide set of inclined cam surfaces 120, as can be seen most clearly in FIG. 15, which extend from the side of a groove 77 in the obftii direction to the side of an adjacent groove 7 ! extend. The chucks 30a come into engagement with the surfaces 1.20, which rotate sufficiently to bring their outermost bores into alignment with the spindle grooves 77 through which they pass and thereby come completely free from the spindle. The pulling up of the device can continue.

be set to get out through the drill string / by fSohrgostoll

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-2- & 48-519-

to draw.

The drill chucks in the rturführungform of the invention shown in FIGS. 10 to 15 have a larger arcuate shape Extending to than in the other embodiment and offering a much larger area for cutting in the formation. As can be seen from Fig. 1 * 1, sweeps the inner area of the Drilling surfaces of the chuck a total of approximately 360 °, whereby avoiding the need to provide an additional internal bit to cut the internal portion of the formation; as is the case with the other embodiment of the invention the case is. In addition, the actual drilling surfaces J05, 106 are both the drill chuck and their free cutting surfaces 107 has been enlarged considerably compared to the other embodiment.

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ORIGINAL INSPECTED

Claims (1)

- ■ -4G48S-1-9- Patent claims: 1. Retractable and extendable screed device that runs lengthways is movable through a tubular drill string inserted in a borehole, characterized by an on the drill string attachable outer tube, which has a drive spindle, characterized fe'rner by one of a plurality of push-out and retractable cutting tools, consisting Cutting device, this telescopically holding carrier, engaging coupling members on the spindle and on the cutting tools for attaching the latter to the locker? in the pushed-out position and with each other in Engaging alignment parts on the cutter and the outer tube for aligning the cutting tools for a Simultaneous lateral pushing out in the coupled state with the spindle, with the carrier down to the cutting device can be moved into a position in which the cutting tools are pushed outwards in de ^ i and with the spindle coupled state are kept. 2. Drilling device according to claim 1, characterized in that that the aligning parts which are in engagement with one another also include the j ι limit the lowering movement of the cutting device in the outer tube! Zen. . ! 3. drilling device according to claim 1 or 2, characterized in that that the cutting device e ^ 'ne upper cam bushing 109816/1570 SAO ORiGJNAU -2443-54-9 - - 2 Il - has, which carries the alignment parts and on the in the circumferential direction laterally movable arms, which are arranged at a distance from one another, are attached and hang down therefrom, with the lower one Find areas of the arms attached to the cutting tools. H. Drilling device according to one of Claims 1 to 3, characterized in that the aligning parts which come into engagement not only limit the lowering movement of the cutting tools, but also bring them into their position for lateral pushing out and into coupling engagement with the spindle. 5. Drilling device according to one of claims 1 to k, characterized in that the spindle has longitudinal grooves in which the arms move with the cutting tools when they are pushed out sideways. 6. Drilling device according to one of claims i to 5, characterized characterized in that the arms have longitudinal slots and the carrier is provided with wedges which slide in the slots and . Engaged with the cam socket at the upper ends of the slots ■ come to lift the cutter in the outer tube up through the drill string. 7. Drilling device according to one of claims 1 to 6, characterized in that the carrier is laterally inside the cutting j tools protrudes so that he in his the cutting tools I laterally after a sweet holding position an inner area of the j 109816/1570! 8AD ORIGINAL Ρ ¹ ™ ¹ "! ..1111111 !! IH ■. Ι.! '. ■ Drills out boreholes. 8. Drilling device according to one of claims 1 to 7 »characterized in that the cutting tools in the spindle overlap each other in the retracted position in the circumferential direction. 9. Drilling device according to one or more of the preceding claims, characterized in that the spindle in the circumferential direction has spaced apart slots into which the cutting tools can expand, and that the interengaging Alignment on the Align the cutting device and the outer tube with the cutting tools on the slots and push them outwards into them and couple with the spindle by pulling the carrier down is movable into a position in which it is behind the cutting tools and these in the slots pressed on the outside and coupled with the locker}. 10. Drilling device according to one or more of claims to 9, characterized in that the outer tube rises cams, with which the cutting tools when lifting the cutting device come into engagement in the outer tube and align the overlapping cutting tools with the grooves to make. Passing part of the cutting tools through the grooves enable. j 109816/1570 8AD ORiGJNAU 11. Drilling device after one or more of the preceding Claims, characterized in that the spindle slots have upper areas networked in the circumferential direction and the cutting tools are provided with offset parts which fit flush into the offset areas of the slots. 109816/1570 BATH ORIGINAL