DE1950254A1 - Device and method for casing a borehole with cement pipes - Google Patents

Description

4 DÜSSELDORF 1 - PATENT LAWYERS

Malkastenstrasse 2 DIPL.-ING. ALEX STENGER

Telephone (0211) 360514 DIPL.-ING. WOLFRAM WATZKE

Our reference: Io J585 Date: ^ λ fict A

ROTARY OIL TOOL COMPANY

8655 Whitaker Avenue, BUENA PARK, California, USA

Apparatus and method for casing a borehole with cement pipes

The invention relates to a device for piping a Boreholes with Zementrohrerij the invention also relates a piping process to be performed with such an apparatus. . "-" ■■■

It is known to insert a cement pipe into a borehole Bringing casing by inserting a drill string consisting of several drill pipes into the borehole lowers and then exit cement from a drill shoe or cement shoe attached to the lower end of the rod then this rises in the annular space between the drill string and the borehole wall upwards, and after the usual curing time, the drill string is with

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firmly connected to the wall of the borehole by the concrete pipe. The interior of the drill pipe is then exposed, so that further drilling and / or conveying tools can be introduced.

The drill pipe is often subject to major temperature fluctuations, for example when superheated steam is passed through it shall be. Then there is the danger that the temperature Fluctuations an expansion and then a contraction pulling the drill string takes place and that by this proper movement of the drill pipe the concrete pipe is destroyed * there Concrete has a different coefficient of thermal expansion. For this reason it is not yet possible to use the Drill rods to pass a medium that balings larger temperature fluctuations, unless special, relatively expensive measures are taken for thermal insulation of the drill rod. ·

The invention has the object of providing a device for piping to create a borehole with cement pipes, with the one Piping can be made to protect against temperature influences is far less sensitive. This device should be simple in structure and simple Enable way of working. The invention also has the there would be to create a method for piping by means of such a device, the implementation of which requires as little working time as possible and that even with untrained Forces is easy to carry out. Otherwise it belongs to Object of the invention, the difficulties and disadvantages to eliminate the prior art.

To solve such a problem, a device is used proposed according to the invention of the type mentioned at the beginning.

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that a drill shoe is attached to a drill pipe that anchor feet that can be expanded to the side are arranged on this, which are retracted into the borehole when lowering Position and after lowering under a stop surface are spread out that the drill shoe has a spreader has and that this is longitudinally displaceable in the Bohrsohuh is arranged.

Such a device makes it possible by supporting the drill shoe and thus the drill rod under a; · Stop surface to apply tension to the drill pipe itself and to tension it in its longitudinal direction and to stretch, in which case it then remains, while the cement is between the drill pipe and the wall of the borehole is introduced. If piping is made of cement with such a device, it occurs when a warm or hot medium is passed through the drill pipe, an expansion, particularly an extension, the same no longer or only to a small extent, so that now there is no significant intrinsic movement of the drill rod compared to the concrete of the piping.

In a further embodiment of the invention, a method proposed for casing a borehole with the device according to the invention, the method steps therein exist that a downward stop surface is made in the borehole that a drill string up is lowered to this Ansjehlagfläche that the drill pipe is supported on the stop surface against pulling out of the borehole and that then the drill pipe is etched under tension while the cement is introduced into the borehole.

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The! »Creates a itigspanniang in the J & öteft linkage MI-with known i | itIeM Jjq simple white © jnögiieh * ^ d ^ it also does not cause any difficulties to create the necessary surface area in the borehole. Therefore, the implementation of the efficient method requires great problems ■ - "v; t Ättfwfiuid-i, on the other hand, it is with t ^ i & Wsr Ef *

Without further ado, it is possible to have a piping which is not or is only slightly sensitive to fluctuations in temperature: 3 w * d youi?

While the dead weight of the drill pipe and also the weight of the drill shoe attached to the lower end To create a tensile stress of a certain value in the drill pipe, the introduction of concrete into the drill pipe is not required Haum parts of the drill shoe are particularly suitable for increasing the generation of tensile stress. After the. Cement ' Piping can then be such concrete layers and other, Parts that are still located in the interior of the drill rod and that have been used, for example, to generate the tensile stress, -. be drilled out. These parts mostly consist, also, made of a material that can be easily drilled, so that the ■ uncovering of the interior of the drill pipe is not difficult prepares.

Further advantageous embodiments of the device and: / the method of the invention, together with wei - ^ .. ϊ ,, direct benefits from the following description of a, *, * - that ER ■ "Äusführungsbeispiels made with reference to a drawing.. , -following i show in detail: ... - .. · *

Ii ¹ Ig. 1 shows a longitudinal section through a device according to the invention, which after the production of the stop

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area was introduced into the borehole and its anchor feet used for support are still trapped in are in a position to

Pig, 2 a cut after Pig. 1 similar longitudinal section of the lower part of the device, wherein the anchor feet are now spread out,

Pig 3 a cross section along the line 3 - 3 in Big i,

Pig. 4 shows a section according to Pig. I cut similar another embodiment of the invention,

Pig. 5 one-tier Pig. 4 similar representation γ however the anchor feet of the device are spread out,

Pig. 6 through a partial subassembly on an enlarged scale a coupling part of the device.

To an embodiment of the device according to the invention To explain, the arrangement of the device is shown together with the lower part of a drill string B in a borehole A of a well bore. The drill pipe extends near the top to the end of the well bore and from there it was lowered into the borehole. As can be seen from FIGS. 1 to 3, part of the device a drill shoe Io with a main pipe 11 that has an upper, threaded socket part 12 with which it can be inserted into the thread of a lower male part 13 a valve body 14 is screwed to a Check valve 15 belongs. The top of the check valve 15 is also via a thread on a drill pipe of the Drill rod B attached that extends to the top of the

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Bohrloches-A-er.9tre.ckt · -'- The shut-off valve 15 can have any design and can then be used, if should be prevented «that the drill pipe B during the lowering in the borehole A already fills with the drilling fluid or another fluid. The interior 16 of the shut-off valve 15 is otherwise made of a material filled that can be easily drilled out, for example with concrete. In the interior 16 ribs 17 are provided, while the main piece 19 of the check valve 15 is in position and Has corresponding grooves 18 in shape. Also inside in the area of a central channel 25 on a sewer pipe Mutes 21 are provided in the ribs 2o of the interior 16 filling concrete. At the lower end of the sewer pipe 22 is a valve flap 24 by means of a pivot 25 attached; this can be achieved by a movement in the upward direction with a valve seat 26 surrounding the sewer pipe 22 be engaged. The Kknalrohr 22 and the valve flap 24 can for example be made of cast iron or other Material be made that can be easily drilled. If the penetration of liquid into the drill pipe B during the lowering of the same into the borehole A does not needs to be prevented «the shut-off valve 15 can be omitted; the Bohrsohuh Io is then directly at the bottom Drill pipe attached to the drill string B.

The main tube 11 of the drill shoe Io 1st at its lower Point provided with a concrete insert 27, which is given the shape of a point by an inclined surface 28, so that this during the cutting down of the drill string B into the borehole A can lead the Bohrsohuh Io past any obstacles located there. The concrete insert 28 also has ribs 29, which into grooves 30 of a bush 31-

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ragenj the latter is on the main pipe Il of the Böhrsehuh io at «· Specifically, fastened with a number of screws. 32. A centrally located pipe runs through oil B ^ clay insert £ 7 33, which is supported by a sleeve 34 made of easily drilled material such as For example, fiber or the like is formed »The Bush ^ l is also with several, extending in the axial direction extending ^ claws 35 provided, their purpose later is explained in more detail. .-

On the circumference of the main pipe 11 there are several elongated recesses 36, in each of which an anchor foot 37 is arranged. As can be seen, the upper part of each anchor foot 37 is rotatably attached to a pivot pin 38 which extends across the recess 36 and to the main tube, !! attached in a suitable manner * for example by welding. The main part of an anchor foot, 31 has a T-shaped cross-section with a foot piece 39 in the middle, which essentially extends into the main pipe 11 when the anchor feet 37 are in their retracted position on its outside in two leg pieces 4o which run in the opposite direction and lie transversely to it and which extend in the longitudinal direction over a substantial part of the foot piece 39. As shown in FIGS. 1 and 3, when the anchor feet 37 are in the retracted position, the leg pieces 4o also lie within the circumferential lines of the main pipe 11 within a recess 36, the lower main part 51 of which is wider than its upper part 42; by this, only the Fußstück39 and the pivot pin 38 extend namely * In the embodiment shown in Figures 1 and 3 retracted position the anchor foot 37 have obliquely downwardly extending spreader surfaces 43, whereby the from the Fftßstücken 39 and the leg parts 4o formed outer surfaces 44 in the substantially parallel to the axis of occupied Bohrschuhs Io extend "In its first ^A-1 US gear position, the anchor foot 37 made within of the main pipe

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held by means of an easy-to-release belt 45 ■, the is placed around the anchor feet 37.

The anchor feet JJ can be spread out to the side and held in this position by means of an expansion head 46 which can be operated hydraulically like a piston. The expansion head 46 has an outer expansion tube 47 which slides on the inner wall of the main tube 11 and in the starting position lies above the same when the anchor feet 37 are retracted. In this position the expansion tube 47 is held by a disengageable coupling ring 48 which has the shape of a slotted, resiliently compressible ring and engages in an outer annular groove 49 of the expansion tube 47 at the same time the coupling ring is located

48 in an opposite, inner ring groove 5o of the main pipe 11. The upper inner sloping surface 51 of the coupling ring is bevelled downwards and can be provided with a bevel 52 of the annular groove 49 are brought into engagement. If now on the expansion head 56 a downward force of sufficient Size, the coupling ring 48 is stretched outwards by the action of the inclined surfaces 5I and 52, so that it extends further into the annular groove 5o and the annular groove

49 completely releases. As a result, the expanding head 46 move along the anchor feet 37 downwards.

In the expansion head 46 there is a concrete insert 53 * which is opposite the expansion tube 47 anchored with the help of ribs 54 made of concrete which is in corresponding grooves 55 of the expansion tube 47 fit. A line 56 runs through the middle of the concrete insert 53 and is passed through a pipe 57 made of an easily drilled material how fiber is formed, for example. The upper end of the pipe 57 sits in a pipe section 58 * which is also from consists of easily drilled material and has an upwardly directed valve seat 59. The upper part of the expansion tube 47, the

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Concrete insert .53 and the valve seat 49 is beveled downwards, to get a good guide towards line 56 ' to achieve.

The main pipe 11 has several annular spaces 6o distributed around its circumference, which are formed by radially extending openings which extend through the main pipe 11 and are connected to upwardly directed passages 61 in the main pipe 11 in the form of grooves. A sleeve 62 is attached to the latter by means of a weld 63, which surrounds the main pipe 11 and also surrounds the passages 61 and the outer openings of the annular spaces 6o. This is intended to deflect the liquid flowing through the annular spaces 6o and the passages 61 in an upward direction. A sealing ring 64 is attached to the main pipe 11, which in the starting position of the expansion pipe 47 creates a seal above the annular spaces 6o in order to prevent the passage of liquid between the main pipe 11 and the expansion pipe 47. The lower end of Spreizrohrs 47 is provided with a plurality of axially directed Kupplungskliuen 65, which cooperate with the on-top of the jack Jl claws 35 to the spreading head 46 with the lower bush 31 rotationally connect.

When the Sprefczkopf 46 has reached its lower end position, an upwardly directed stop surface 66 located on the upper part of the expansion tube 47, which is formed with the help of an attachment part 67 of a smaller diameter than the expansion tube 47, lies directly below the coupling ring 48. This pulls then come together again over the stop surface 66 and prevent unintentional upward movement of the expansion head .46. When the expansion head 46 is in this position, the annular spaces 6o and the through-

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steps 61 released, as can be seen from FIG.

To use the device described, the borehole A is first drilled with the desired diameter, and then the diameter is determined by using a tool suitable for increasing the diameter on the for the Drill shoe Io enlarged. There is then a lower borehole part C with a larger diameter, which only needs to have a relatively short length and which serves to form the downwardly directed stop surface D, which after can diverge in a funnel shape at the bottom.

The drill shoe Io and the check valve 15 are then attached to each other attached, wherein the check valve 15 is connected to the lowermost drill pipe of the drill string B. At this time the expansion head 46 is held in its upper starting position by the coupling ring 48, and the anchor feet 37 are by the releasable strap 45 in its retracted position held; these parts assume the position shown in FIGS. Then the drill pipe is inserted into the Drill hole A lowered until the anchor feet 37 * die are still in their retracted position, the expanded one Borehole part C below the previously prepared stop surface D have reached.

Now can be downgepurapt through the drill string B and through the shut-off valve 15 drilling fluid, the valve flap 24 is lifted from its valve seat 26, so that the Liquid flow through the line 56 and through the underlying line 33 can continue to flow it then opens into the Borehole part C and the rest of the borehole A and then passes through the annulus 70 to the upper end of borehole A. Then a suitable valve ball 71 with a smaller one

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Diameter than that of the channel 23 in the shut-off valve 15 * but with a larger diameter than that of the line 56 leading through the expansion head 46, thrown down or pumped through the drill rod B. The valve ball 71 then passes through the channel 23 of the shut-off valve 15 and reaches the valve seat 59 of the expansion head 46, on which it rests. The pressure of the liquid in the drill pipe is then increased slightly so that it exerts a downward force on the expansion head 46; the pressure is increased until this force is sufficient to press the coupling ring 48 completely out of the annular groove 49 so that it lies in the annular groove 5o of the main pipe 11. Then the expansion head 46 can be pushed down, with its expansion tube 47 being pushed along the inside of the expansion surfaces 43 of the anchor feet 37 and spreading them out troll. This spreading movement is limited by the abutment of the abutment saws 72 located on the anchor feet 37 on each abutment surfaces 73 which are located on the main pipe 11 at the upper ends of the recesses 36. The expansion head 46 and the expansion tube 47 slide along the inner foot pieces 39 of the anchor feet 37 until the expansion tube 47 rests against the bushing 31 underneath and the concrete insert 27. At this point the stop surface 66 is below the coupling ring 48 so that it can resiliently contract against the extension part 67 of reduced diameter, so that the expansion tube 47 is locked at its extension part 67 so that the entire expansion head 46 is held in a lower end position . At this point in time, the annular spaces 60 and passages 61 are then open. The fact that the anchor feet 37 are spread out and locked in this spread position is indicated to an operator standing at the top of the borehole by the fact that the annular spaces 60 and passages 61 are open and a backflow .. of the liquid

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Allow keitsströmung through the drill pipe B and those lying between this and the wall of the borehole A. Ring room 7o -through. '"Leads upwards.

Then the drill rod B is tightened firmly upwards in order to bring the anchor feet ¹ VJ to a firm contact with the stop surface D. A tensile stress of a certain magnitude is exerted on the drill pipe B, which can reach a very substantial "value" and which in practice can approach that value which corresponds to the tensile strength of the connections of the drill pipe B. While .these on the drill pipe B acting tensile stress is maintained, is pumped down through this and through the annular spaces 60 and passages 61 in a known manner cement slurry, for which one uses cementing shoes of known design, not shown here The tensile stress acting on the drill rod B is maintained until the cement has set L and has hardened.

Then pipe rods are attached to a suitable line core a rotary percussion drill or a hollow tool into the drill pipe let down what is not shown here; With this tool the inner parts of the check valve are then removed 15 and the drill shoe Io, which has a smaller one Diameter than the inside diameter of the drill string B "corresponds. This is essentially the interior 16, the 'sewer pipe 22, the valve flap 24, the concrete element 55 * the pipe 57 and the pipe section 53 · L'as Drilling clear of the expansion head 46 is facilitated by the fact that the coupling claws 65 engage with the claws j55 underneath are and a rotary movement "of the.] extraction head 46

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prevent. The drilling is fartnetetzfc until all internally protruding parts of the check valve 15 and the drilling shoe Io within the circumferential lines of the Spreirsrohrs and the underlying socket 31 completely detached or encountered the bottom of borehole A.

The tensile stress prevailing in the drill string B is through maintain the set cement located between this and the soil. A subsequent increase the temperature prevailing in the drill pipe B, for example as a result of the introduction of steam into the drill pipe and a production zone can result, is then not with connected to a significant extension of the drill string B, because this has already been put under tension and stretched in the longitudinal direction. This creates a Destruction of the borehole A, the set cement and the drill rod B avoided.

A modified embodiment of the invention is shown in FIGS. 4 and 5, in which drilling shoe Io a is designed with the anchor feet 37 as a control slide; the upper end of the drill shoe Io a is with the check valve 15 connected, while at the lower end with a thread a lower drill pipe 8o is attached. The drill shoe Io a is constructed essentially exactly as the drill shoe shown in Figures 1 to 3 lo, the lower Concrete insert 27 a in the lower part of the head pipe 11 cast immediately below the recesses 36 and provided with an easily drilled out inner sleeve 34 a is, which has a centrally located line 33 a. This leads to side outlets 81 which are below the recesses 36 "out of the main pipe 11a to the outside to lead. If desired, the page exits can be

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steps; "'U" omitted and dj.e with fcfcig lying line 33 a' all the way around the concrete insert? to direct liquid into the underlying drill pipe 8o and to run to the bottom of the drill string from ViO from the liquid 'in the borehole A and the borehole part. C arrives.

The upper part of the expansion head 46, the coupling ring 48,. the annular grooves 49 and 5o and the Arischlagfläche 66 are formed essentially exactly as in the embodiment of the invention described above; The only exception is that there are no side outlets in the main pipe 11 which are closed by the expansion pipe 47 in the starting position. There is now an inner ¹ pipe insert 83 slidably inserted into the conduit 57 a, both of which are made of easily drilled material. In its starting position, the pipe insert 83 is in a lower position in which its upper ring extension 84 rests on a support surface 85 on the inner conduit pipe 57a; At this time, the side openings 86 located in the upper part of the pipe insert 83 are closed, and the pipe insert 83 extends a substantial distance from the underside of the concrete insert 53 and the conduit pipe 57 ^a downwards. V

The operation of the shown in Figures 4 and 5 The embodiment is essentially the same as that the embodiment described above. The drill shoe Io a is connected to the shut-off valve I5, which in turn ■ · is attached to the overlying drill string B; the But drill shoe Io a can also be attached directly to drill rod B be attached in case a check valve as it is through the check valve 15 is shown is not required. The lower end of the drill shoe Io a is connected to the

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-15- 195025A

lying drill pipe 80 or another suitable part connected. The drill rod B is lowered into the borehole A. until the anchor feet 37 are located in the enlarged borehole part C below the stop surface D. Fluid can then be circulated downwardly through the apparatus to flush borehole A. When the anchor feet 37 are to be spread out, the valve ball 71 is thrown or pumped down through the drill rod B, passing through the shut-off valve I5 to the valve seat 59 & of the slidably inserted pipe insert 33, around the line leading through the pipe insert 33 56 a to lock. Then the pressure of the fluid in the drill rod B above the valve ball 71 is increased, whereby a downward force is exerted on the expansion head 46 and the coupling ring 48 is brought outward into such a position that it detaches from the expansion head 46: the latter becomes then pushed downwards, engaging with the expansion surfaces 43 of the anchor feet 37 and expanding them to the side. The expanding head 46 moves further down until it touches the Bpton insert 27 a lying below it j at this time the expanding head 46 is behind the anchor feet 37 ₃ so that it holds it in its expanded position. The coupling ring .4S contracts over the attachment part 67 of the expansion tube 47 and over the contact surface 66 , so that it holds the expansion head 46 in its lower position (Fig. 5) With the downward movement of the warhead 46 into its lowest position, the underside 88 comes the tube insert 83 to the inner sleeve 34 a in the cement liner 37 a in contact, so that further downward movement of the tube insert 83 is prevented, while the remaining part of the spreading head ^t! 6 can pass to move to its lower end position at the tube insert. Here

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shifts see the upper picture of the conduit 57 -a "opposite the upper end of the tube inserts 83 so that the upper ^ edge of the pipe 57 a below the Seitenoffnuhgen 86, which is then according to the representation after Pig * are open *

When the arm feet 37 are spread out and locked in this position, the drill rod B is raised in order to bring the arm feet 37 to a firm support opposite the stop surface B and to apply a suitable tensile stress to the drill rod B through the drill pipe B and through the shut-off valve 15 in the underlying Bohrsohuh Io a leading fluid circulation is set in motion, which leads through the side openings 86 in the upper part of the pipe insert 83 and into the line 56 a, from where it goes down through this and through the line 33 a of the lower concrete insert 27 a continues, ^{4 of} which: The liquid flow then emerges through the side outlets 81 from the drill pipe B and the Böfrrschuh Io a be pumped through the drill pipe B, this path extending through the annular space To surrounding the drill pipe B to the upper "E nde of the borehole A can continue. During the embedding process, the tensile stress prevailing in the drill pipe B is maintained, as is the case until the cement has hardened and hardened.

0010237 1. If § -.:

Claims (6)

1 95025 A claims 1. Device for casing a borehole with cement pipes , characterized, that a drill shoe (lo) is attached to a drill rod (B) that can be expanded to the side on this Anchor feet (37) are arranged, which are when lowering in the borehole (A) are in the retracted position and after lowering under a Stop surface (D) are spread out so that the drill shoe (lo) has an expansion device (expansion head 46) and that this is longitudinally displaceable in the drill shoe (lo) is arranged. 2. Device according to claim 1, characterized in that that the spreader (spreader head 46) in height the spread anchor feet (37) in the drill head (lo) can be locked so that the anchor feet (37) in their be held in the spread position. 3. Apparatus according to claim 1, characterized in that the expanding device (expanding head 46) in its The starting position can also be locked before the anchor feet (37) are spread out. - 18 - 009823/1198 BATH - is - 195025 4. Apparatus according to claim 1, characterized in that that the expansion device (expansion head Λ6),., through a Main pipe (Ii) of the drill head (Io) and through an in the main pipe (11) longitudinally displaceable expansion pipe (47) is formed. 5. Apparatus according to claim 4, characterized in that das.Spreizrohr (47) has an axial line (56) , the upper end of which as a valve seat? (59) is designed for a valve ball (71). . 6. Apparatus according to claim 1, characterized in that that the main pipe (11) of the drill head (Io) Seitenaustritt (Annular spaces 6o, passages 61), the can be closed by the expansion tube (4-7). 7. Device according to claim 6, characterized in that the side outlets (annular spaces 6o, openings 61) are closed by the lower part of the expansion tube (47) in its initial position and that the expansion tube (47) locks the anchor feet (37) in its position End position is pushed so far down in the main pipe (1,1) that the side outlets. (Annular spaces 6o, openings 61) lie above the upper edge of the expansion tube (47). ,. ...... ~ _s 8. Device according to claim; 4, characterized, that the expansion tube (47) with a concrete insert (53) is filled, in which a line (56) forming Line pipe (57) is inserted. . ■ "--.- 9. Apparatus according to claim 2 or 3 * characterized in that the expansion tube (47) at its lower < ,. . .; . _; - 19 009823/1198 - OAf \ DnU End has an annular groove (49) which in the starting position of the expansion tube (47) an annular groove (5-o) of the main tube (11) is opposite, and that in the end position of the expansion tube (47) the annular groove (5_o) of the main tube (11) of a constriction (attachment part 67) of the Opposite expansion tube (47). ♦ device according to claim 9, characterized in that that the annular groove (5o) is so deep that it slotted a lying in the annular groove (49) of the expansion tube (47) Coupling ring (48) can take up completely when it is pushed out of the annular groove (49) will. 11. The device according to claim lo, characterized in that that to push the coupling ring (48) out of the annular groove (49) this and the coupling ring (48) have corresponding inclined surfaces (51, 52). 12. The device according to claim 9, characterized in that in the lower end position of the expansion tube (47) the coupling ring in the constriction (attachment part 67). snaps into place at the upper end of the expansion tube (47) and prevents it from moving upwards. 13. Apparatus according to claim 5 and 9, characterized in that for pushing out the coupling ring (48) from the annular groove (49) of the expansion tube (47) a valve ball (71) is placed on the valve seat (59) and the top of the expansion tube (47) ) are pressurized. - 2o - BATH The apparatus of claim i wherein _t / Sp that the attractive Rohr (^ 7) / öist atffv on its underside / Vnscniage (72) on which ^in! the end position of the extension tube (4? 7 connection flats (73) of the anchors for (37)) so that another opening of the extension (37) is blocked 15. The device according to claim 1, characterized in that the fieüptrohr (ίΐ) of the drill head ice (lo) has recesses (36) at its uhtereh end / in which the anchor feet (37) are in the retracted position be ¹ -findeTn ^ and d ^ ß the Ärifcerfül3e (37) with hine in the interior of the HaiiptroWres (11) ^ nragendien oblique Sprefzflachen (42) are provided / operating at a AEB # ärtsbe- vieguri§ ^de1s! Sprelzrbhfeii (4-7) with this in engagement g-eläiigen and the spreading of the anchor feet (37) Device according to claim 15 / d ^! asigned by geTtehri; that uhtejtoaaib of the outer cutouts (36) in the main pipe (11) Klaxxän (35 ") ^L are provided / the relative rotary movement between the main pipe (H) and expansion pipe (47) in the lower end position of the same by engagement n: it on the underside of the expansion pipe "prevent the coupling claws (65) provided. IT. Vorfichtung according to claim 1, characterized gekennzelehnet> ■ 'that the lower ■ tip of the main tube (H) also "has a concrete insert ^: (27) and an axial line (33), on which the concrete insert (53)' and ä ± e ■ axial line (56) of the expansion tube (47) in the lower end position of the same. BATH lo. Device according to claim 1, characterized in that the ßeltuiiaustrltte of the main pipe (11) designed as annular spaces ■ (öO) are from which passages (oil) in vertical Direction upwards, and that the side outlets are above the anchor feet (37). 1 _; ,, Device according to claim 17 *, characterized in that below the anchor feet (37) - side outlets (oil) are provided which are connected to the axial line (33 &) in the lower tip of the main pipe (Ha) so that at If the axial line (5öa) in the expansion pipe '- ( ¹ VJ ) is in contact with the axial line (33a), there is a connection between the side outlets (8l) and the drill rod (B) located above the main pipe (Ha). · 20. The device according to claim 19, characterized in that a Tube insert (83) in one the axial line (56a) in the expansion tube (47) forming pipe (57a) is inserted longitudinally displaceable that this pipe insert (83) in the starting position of the expansion tube (47) protrudes a little below this and that the Rohrinsätζ (83) when resting on the axial Line (33a) of the lower tip of the main tube (Ha) with the further downward movement of the expansion tube (47) is pushed up in the conduit (57a) that it has a corresponding Piece protrudes into the upper interior of the expansion tube (47). 21. The device according to claim 20, characterized in that the upper part of the pipe insert (83) has side openings (86), which are exposed in the lower end position of the expansion tube (4 /) and a connection in the upper interior of the spreader tube (47) if on the upper face of the pipe insert (83) a valve ball (7I) rests on it. 22. The device according to claim 1, characterized in that between the main pipe (11) and the upwardly adjoining drill rods (B), a shut-off valve (15) is arranged, the one Blocks pressure or flow passage in the direction from bottom to top. 009823/11 98. -22-BATH O ₂ 195.0 25 A. ■ 2J. Method for drilling a borehole with cement pipes by means of a device according to claims 1 - 22 ,, thereby marked that in the borehole. (A) one directed downwards. tefce stop surface (D) is made that a drill pipe (B) is lowered to this stop surface (D) that the Drill rod (B) on the stop surface (D) to prevent it from being pulled out is supported from the borehole (A) and that the drill pipe (B) is then placed under tension while.der Cement is introduced into the borehole (A). . . 24. The method according to claim -2'j>, characterized in that with. the drill pipe (B). a drill shoe (10) is lowered to the stop surface (D), that Ankerfüß.e (37) are spread out from the drill shoe (10) against the stop surface (D) and that the drill rod (B) is then placed under tensile stress. 25. The method according to claim 23, characterized in that the Tensile stress up to. Hardening of the cement is maintained. 2.6. Method according to Claim 23 *, characterized in that the Drill rods (B) in the position stretched by the tensile stress in the Borehole (A) is held. . ■ 27. The method according to claim 2o, characterized in that this happens through hardened cement pipes.