DE102011000320A1 - Drilling rig for carrying out drilling in soil, comprises drilling frame, and drive unit slidably arranged on frame, where drive unit has rod cartridge for detachably connecting with drilling pipe, and drive motor standing with cartridge - Google Patents

Abstract

The drilling rig comprises a drilling frame (14), and a drive unit (18) slidably arranged on the drilling frame, where the drive unit has: a rod cartridge (28) for detachably connecting with a drilling pipe; a drive motor (24, 25) that stands with the rod cartridge in a torque transmitted connection; a casing tube recording (32) coaxial to the rod cartridge for detachably connecting with a casing tube; and the drive motor and a coupling unit for the torque transmitted connection between the drive motor and the casing tube recording. The drilling rig comprises a drilling frame (14), and a drive unit (18) slidably arranged on the drilling frame, where the drive unit has: a rod cartridge (28) for detachably connecting with a drilling pipe; a drive motor (24, 25) that stands with the rod cartridge in a torque transmitted connection; a casing tube recording (32) coaxial to the rod cartridge for detachably connecting with a casing tube; and the drive motor and a coupling unit for the torque transmitted connection between the drive motor and the casing tube recording. The unit is provided to generate in direction of a longitudinal axis of the drilling pipes of an offset of an end of the drilling pipe lying opposite to the rod cartridge disposed to a drilling tool relative to an end of the casing tube lying opposite to the casing tube recording disposed to the drilling tool and/or to change the offset. The unit of the offset is generated by a relative movement of the casing tube recording and the rod cartridge in direction of the longitudinal axis of the drilling pipe. The unit is formed for generating the offset of the rod cartridge and the casing tube recording such that the offset is continuously adjustable. The unit for generating the offset is formed between the casing tube recording and the rod cartridge such that the offset is adjustable in discrete-sections. The drilling pipe is provided, and comprises linkage sections (30) connected to each other. The casing tube is provided, and comprises casing sections connected to each other. The unit for generating the offset comprises the linkage section and the casing section. The linkage section and the casing section have different length. The drilling tool is connected with the casing tube and the linkage. The casing sections have same length, where a first linkage section has the same length as well as the casing sections. A second linkage section has a shorter length as well as the casing sections and/or a third linkage section has a greater length as well as the casing sections. The linkage sections have the same length, where a first casing section has the same length as well as linkage sections. A second casing section has a shorter length as well as the linkage sections and/or a third casing section has a greater length as well as the linkage sections. The coupling unit comprises a carrier arranged to the rod cartridge, and a rotational stop for intervention arranged at the casing tube recording. The rod cartridge and the casing tube recording are coupled over the rod cartridge with the same drive motor and/or motors. A hole hammer as the drilling tool carries: a drilling head, whose outer diameter is smaller than an inner diameter of the casing tube; and an eccentric drilling head, whose small outer diameter is smaller than the inner diameter of the casing tube and whose large outer diameter is larger than the outer diameter of the casing tube. A transition piece is arranged between the drilling rod and the hole hammer, and is provided with radial centering webs. An axial length of the transition piece is selected so that the length of the drilling tool is connected with the drilling rod formed as the drilling head. The drilling tool is mounted at the casing tube. The casing tube recording comprises a cylindrical tube portion, which is connectable at its distal ends of the drive unit with the casing tube. The cylindrical tube portion is closed at its end facing towards the drive unit by a cover, which has a passage opening for the rod cartridge. The cylindrical tube portion has an outlet opening near its drive-side end for a drilling fluid, and is surrounded by an outlet ring surrounding an outlet opening, which is freely rotatable against the tube portion. The outer ring has a drain outlet for the drilling fluid. The passage opening is sealed in the cover opposite the rod cartridge by a seal. The seal is arranged and/or designed in such a way that it is rotated together with the drilling rod, and arranged in a seal receiver, which is rotated to an outlet ring.

Description

The invention relates to a drilling rig according to the preamble of claim 1.

Such a drilling rig is for example from the document DE 10 2008 003 968 B3 known. With this rig, a drill pipe and a casing are driven in rotation by the same drive motor and can simultaneously be driven into the ground. Such drilling rigs are particularly suitable for economically carrying out wells for geothermal heat transfer with depths of 40 m to 150 m. When using a hydraulic motor as a drive motor of the drive head, the drive hydraulics simplifies compared to drilling rigs with separate drive units for the drill string and the casing, the drive head comprises both a boom receptacle for receiving a drill pipe and a feed pipe receptacle for receiving a casing. At the out of the document DE 10 2008 003 968 B3 known drill rig, the drill string is composed of the same length rod sections and the casing is composed of a plurality of casing sections, each having the same length as the linkage sections composed. Further, a transition piece is arranged on the opposite side of the drill string receiving support, the axial length is selected so that a drill head connected to the drill pipe via a down hole hammer protrudes from the mounted first casing or from a drill bit mounted on the casing.

It has been found in experiments that it is advantageous to change the position of the drill bit connected to the drill string in the direction of the longitudinal axis of the linkage such that the drill bit connected to the drill pipe comes out of the casing or from an end opposite to the end of the feed pipe protruding ring bit of the casing and the drill bit connected to the drill string have approximately the same working plane or that the drill bit connected to the drill string is set back in the casing, i. H. the ring bit connected to the casing is projecting beyond the bit connected to the drill pipe in the direction of advancement. It is advantageous if the length at which the drill bit connected to the drill rod protrudes from the casing or from the ring bit at least in steps, preferably continuously, is variable. Furthermore, it is advantageous if the length with which the annular drill bit connected to the casing exceeds the drill bit connected to the drill pipe at least in steps, preferably continuously, is variable.

The object of the invention is to provide a drilling rig, in which the opposite end of a drill rod receiving a drill string relative to the opposite end of a feed pipe receiving end of a casing can be easily positioned.

This object is achieved by a drilling rig having the features of patent claim 1. Advantageous developments of the invention are specified in the dependent claims.

By drilling rig for performing drilling in the ground with the features of claim 1 ensures that in a simple manner, the position of the associated with the casing and the drill pipe drilling tools can be changed to one to be ablated with the help of drilling tool layer the soil suitable position of the drilling tool to each other.

It is advantageous if the means produce the offset by a relative movement of the feed tube receiving and the boom receiving in the direction of the longitudinal axis of the drill string. Thereby, the change of the position of the drilling tool can be done easily by suitable positioning means for positioning the boom support and the feed pipe receiving. This can be done in particular in that the means for generating the offset are designed such that they allow a continuous longitudinal displacement between the feed tube receiving and the Bohrgestängeaufnahme, so that the offset is infinitely adjustable. This can be done for example via at least one spindle drive or at least one hydraulic cylinder. Preferably, a total of two adjusting means, in particular two spindle drives or two hydraulic cylinders are arranged on opposite sides of the feed pipe receiving, so that a uniform longitudinal displacement between the feed pipe receiving and Bohrgestängeaufnahme in the direction of the longitudinal axis of the drill string is possible to produce the offset. As a result, a longitudinal displacement between the feed pipe receiving and the Bohrgestängeaufnahme over the entire adjustment can be made continuously.

Alternatively, the means for generating the offset between the liner receiving means and the drill string holder may be configured to adjust the offset in discrete steps so that incremental positional displacement of the drill bit connected to the drill string and the drilling tool connected to the casing is possible in a predetermined pattern , The drill string receptacle and the feed pipe receiving can be arranged at several parallel to the longitudinal axis of the linkage Connection points are connectable to each other, of which at least one connection point for connecting depending on the desired offset of the drill string connected to the drilling tool and connected to the casing drill tool is selected in the direction of the longitudinal axis of the drill string. The connection to the at least one connection point can in particular be produced by a screw connection, by a latching connection or by a connection by means of a connecting bolt. This makes possible a simple, robust and inexpensive arrangement for varying the relative position of the drilling tool connected to the drill pipe and the drilling tool connected to the casing.

Additionally or alternatively to the generation of the offset by a relative movement of the feed tube receiving and the boom receiving in the direction of the longitudinal axis of the drill string, a drill string may be provided, which comprises a plurality of interconnected linkage sections. Furthermore, a casing can be provided which comprises a plurality of interconnected casing sections. The means for generating the offset may then include at least one linkage section and a casing section having a different length such that depending on the selection of at least one linkage section and / or at least one casing section, the drilling tool connected to the linkage protrudes from the drilling tool connected to the casing in that the drilling tool connected with the aid of the tubular receiving means projects beyond the drilling tool connected to the linkage or the drilling tool connected to the linkage and the drilling tool connected to the casing have approximately the same working plane.

It is advantageous if either the feed pipe sections have the same length, if at least a first linkage section has the same length as the casing sections. Furthermore, at least one second linkage section may have a shorter length than the casing sections and / or at least one third linkage section may have a greater length than the casing sections. Alternatively, the linkage sections may have the same length and at least a first casing section may have the same length as the linkage sections. Furthermore, at least one second casing section may have a shorter length than the linkage sections and / or at least one third casing section may have a greater length than the linkage sections. With the aid of casing sections and linkage sections of different lengths, the position of the drilling tool connected to the drill pipe and the casing relative to each other in a simple manner and without much effort can be changed by using corresponding linkage sections for extending the drill pipe and / or for extending the conveyor pipe become.

In contrast, when the offset is produced by relative movement of the liner receiving and boom support in the direction of the longitudinal axis of the drill string, with the use of linkage sections and casing sections of equal length, the relative location of the drilling tool associated with the liner and drill pipe can be readily determined by the position of the adjustment means and / or visually detected by means of the position of the boom support and the feed pipe receptacle and / or displayed on a scale arranged on the drive unit.

Additionally or alternatively, the drill string may include a fluid operated downhole hammer, wherein the pressure means is fed to the downhole hammer through the hollow drill string. In this case, the drill string composed of a plurality of linkage sections and the casing tube composed of a plurality of casing sections may have a different number of casing sections and linkage sections. Preferably, all linkage sections and all casing sections have the same length, wherein at least one additional casing section is present in particular in the arrangement of an in-hole hammer at the lower end of the drill string, since a linkage section is replaced by the downhole hammer and possibly by a transition piece.

Furthermore, it can be arranged between the drill pipe and the hole hammer a transition piece, which is provided with radial centering webs. As a result, the drilling tool connected to the downhole hammer via the transition piece, i. H. Drilling tool connected to the drill string, centered to the drilling tool connected to the casing. With the aid of the radial centering webs, a simple central arrangement of the drilling tool connected to the drill pipe to the casing is possible.

The axial length of the transition piece is preferably chosen so that when using linkage sections and pipe sections of the same length designed as a drill head and connected to the drill string drilling tool protrudes from the drill pipe mounted on the drill, especially when the means for generating the offset in a neutral position are located.

The torque transmitting connection coupling means between the drive motor and the liner receiving means are preferably for transmitting torque in both Direction of rotation formed. As a result, the drilling tool connected to the casing can be rotated in both directions of rotation. Further, the casing pipes can be easily connected to each other and separated from each other when they are connected by a screw connection. If the drilling tool is to be rotated in both directions of rotation, the casing sections are preferably connected to one another via another suitable connection, in particular a suitable bayonet connection or latching connection, which allows torque transmission in both directions of rotation, without the risk that a connection between two sections of casing pipe unintentionally released becomes.

Alternatively or additionally, the coupling means may comprise a driver arranged on the boom receptacle and a rotation stopper which is intended to engage with this catch and which is arranged on the feed pipe receptacle, so that preferably a rotationally fixed connection is produced by the coupling means. As a result, only one drive motor or a drive unit consisting of a plurality of drive motors is required to operate the drilling rig, which is in contact with the boom in a torque-transmitting connection. With the help of the coupling means, the boom support and the feed pipe receiving are preferably coupled via the linkage recording with the same drive motor or the same drive motors, so that a simple structural design of the drilling rig is possible. This coupling takes place in particular via at least one chain transmission.

The coupling means for the transmission of torque between the drive unit and the Futterrohraufnahme preferably allows the transmission of torque in both directions, so that screw connections between the individual casings and the individual drill pipe sections can also be prepared and solved by means of the drive motor. A preferred embodiment provides that the boom support and the feed pipe receiving are rotatably connected to each other, but are arranged displaceable in the direction of the longitudinal axis of the drill string in an adjustment to each other, so that the relative position of the boom support and the Futterrohraufnahme easily changed and held in a desired position and preferably can be fixed.

If the drill string is connected to a pressure-medium-operated downhole hammer, a drill head whose outer diameter is smaller than the inner diameter of the casing can be provided as a drilling tool. Thereby, the drill head can be easily passed through the casing, so that both working positions of the drill head and connected to the Imlochhammer drill head are possible, in which drill head and drilling tool are arranged in the same working plane, as well as working positions, in which the tool connected to the casing drilling tool Overhanging drill head. Thereby, the position of the drill bit connected to the drill string and the drilling tool connected to the casing can be changed in a simple manner.

Furthermore, can be pulled out within the casing pipes together with the linkage by such a drill head of the down-hole hammer. However, with such a normal drill bit, the casings can only be propelled through soil and soil until the casings encounter a first layer of rock. From there, the drive must be carried out exclusively with the help of the drill bit and the mortar hammer. The casing can not be driven further. If the ground remains rocky with increasing depth, this is not a problem, since the casing is then no longer required in the greater depths to support the borehole. The hole hammer can drill well with the drill bit in the rock alone or casing, since the rock is usually stable. However, it is problematic if below the rock layer again loose rock or soil follows, so that the drill channel can then coincide in this area. In this case, the casings have to be drilled through the rock layer. For this purpose, the Imlochhammer may have an Exenterbohrkopf whose smallest outer diameter is smaller than the inner diameter of the casing and whose largest outer diameter is greater than the outer diameter of the casing. Thus, the Imlochhammer be passed through the casing pipes together with the Exenterbohrkopf to the drilling site and taken out of the casing together with the drill pipe again.

If the Exenterbohrkopf has been passed through the casing so that the Exenterbohrkopf is outside the casing, the Imlochhammer is rotated in the working direction, so that the drilling elements of the Exenterbohrkopfs are shifted outwards and the Bohrdurchmesser produced by the Exenterbohrkopf is greater than the outer diameter of the casing. The down hole hammer can thus drill through boreholes boreholes which are larger than the casings, so that the casings can also be laid through the rock layers. As a result, casings can also stabilize wells in loosened rock that lies below rock strata.

The drilling rig can be formed in an advantageous development such that the Casing receiving for receiving casings of a first outer diameter is provided, said casing receiving is exchangeable against another feed tube receiving for receiving casings of a different from the first outer diameter second outer diameter. Furthermore, the linkage receptacle may be provided for receiving linkage sections of a first outer diameter, wherein this linkage receptacle is exchangeable for a further linkage receptacle for receiving linkage sections of a second outer diameter different from the first outer diameter. As a result, boom sections and / or casing sections of different diameters can be used together with the drilling rig. This allows the drilling rig to be used to carry out a wide variety of earth boring operations.

Further, it is advantageous if the feed pipe receiving a cylindrical pipe section which is connectable at its end remote from the drive unit with a casing. In this pipe section, the casing can be added. Alternatively, the casing can surround the pipe section from the outside, wherein between the casing and the pipe section a suitable connection, in particular a screw connection, a bayonet connection or a connection can be provided via connecting bolts.

In an advantageous development of the cylindrical tube section is closed at its end facing the drive unit by a lid which has a passage opening for the boom receiving. The cylindrical tube section has at least one exit opening for a drilling fluid near its drive end. The cylindrical tube section is surrounded by a discharge ring surrounding this outlet opening. The discharge ring is freely rotatable relative to the pipe section and has a connecting piece which can be connected to a drain pipe for the drilling fluid. Thus, the drilling fluid rising into an intermediate space between the drill string and the casing pipe can be removed via the discharge ring, the connecting piece and the connection pipe without the drilling system becoming dirty.

Preferably, the passage opening in the lid is sealed against the boom support by seals. The seals are arranged and / or formed such that they are rotated together with the drill string. As a result, the seals are not stressed by the rotational movement of the linkage but possibly in certain operating modes of the drilling rig only by a movement of the drill string in the direction of the longitudinal axis of the drill string. These modes relate to the propulsion of the boom without propulsion of the casing. In these modes of operation, the discharge ring with the discharge nozzle remains connected to the feed pipe last supplied to the drilling installation for discharging the drilling fluid. The seals are preferably arranged in a seal receptacle, in particular in a cage, so that they are freely rotatable to the outlet. The seal receptacle is mounted rotatably relative to the cover and / or the discharge ring and preferably sealed by at least one further seal, in particular an O-ring to the cover and / or the discharge ring. As a result, the service life of the drill string contacting seals can be significantly extended. In particular, the service life in practical tests is about 10 times greater than arrangements in which the seals are not rotatably arranged to the discharge ring and thus takes place during a rotational movement of the drill string, a relative movement between the seal and drill pipe. By this relative movement, the seals are heavily stressed, so that they are subject to high wear.

Further features and advantages of the invention will become apparent from the following description, which explains in conjunction with the accompanying figures, the invention with reference to embodiments.

Show it:

1 a schematic overall perspective view of a drilling rig according to a first embodiment of the invention;

2 a section of the drilling rig after 1 a drive head slidably mounted on a drilling ramp of the drilling rig and comprising a duplex receptacle for receiving a casing and a drill string; and means for varying the relative position of the feed tube receptacle and the drill string receptacle in the direction of the longitudinal axis of a drill string insertable into the drill string receptacle in a first upper position ;

3 the cutout of the drilling rig 2 wherein the casing receiving means is disposed in a second intermediate position relative to the drill string receptacle;

4 the cutout of the drilling rig after the 2 and 3 wherein the casing receiving means is disposed in a third lower position;

5 a connecting element, designed as an inner tube with an external toothing, of a connection arrangement provided in the drive head for the relative displacement of the casing receiving means relative to the rod holder;

6 one after a portion of the inner tube 5 surrounding as outer tube formed connecting element with inwardly projecting pin for engagement in the outer toothing of the inner tube 5 for torque transmission between inner tube and outer tube;

7 a partially sectioned side view of the connection assembly with inner tube and outer tube;

8th a sectional plan view of the connection arrangement between the inner tube and outer tube;

9 a section of another drilling rig with a continuous longitudinal adjustment of the relative position of the feed tube receiving the rod receiving according to a second embodiment of the invention in an upper position;

10 a partially sectioned view of the drive head of the drilling rig according to 1 an arrangement for discharging drilling fluid rising in a space between the drill pipe and the casing, and sealing elements abutting on the pipe, which are arranged in the drive head so as to be rotatable together with the drill pipe; and

11 a linkage section of the drill string and the seal elements rotatable together with the linkage section.

1 shows a schematic overall perspective view of a drilling rig 10 According to a first embodiment of the invention, a chassis 11 with a chassis 12 has, on the one as Bohrrampe 14 executed drilling rig is pivotally hinged such that the Bohrrampe 14 with the help of a working cylinder 16 between in the 1 illustrated vertical position and an approximately horizontal position in which they are on the chassis 12 rests, is pivotable.

At the drill ramp 14 is a common with 18 designated drive unit for a drill pipe and a casing arranged. It includes a sledge 20 at the drill ramp 14 is slidably guided in the direction of the double arrow A and a drive chain, not shown, with the aid of a carriage drive 22 is movable. On the sledge 20 are two hydraulic motors 24 . 25 arranged, which is a spindle 26 drive. Both engines 24 . 25 Act via chain transmission on the same drive train. In alternative embodiments, a single hydraulic motor with a corresponding power may also be provided.

With the spindle 26 is a pole pick 28 coupled, which is connectable to a drill string, of which a linkage section 30 is shown. To drill a hole in the ground using the drilling rig 10 Further boom sections are added to the drilling rig 10 used by the drill pipe is extended until the Bohrgestängeaufnahme 28 opposite end of the drill string has reached the desired drilling depth or Bohrentfernung. With the boom recording 28 is a liner intake 32 about a generally with 27 designated connection unit rotatably coupled, so that the boom support 28 and the feed tube intake 32 simultaneously over the spindle 26 are driven. As a result, the casing and the drill string have the same speed in the present embodiment. The coupling of the boom recording 28 and the feed pipe receiving 32 with the help of the connecting elements of the connection unit 27 will be described below on the basis of 2 to 8th explained in detail.

At the bottom of the drill ramp 14 are a casing clamp 34 , a drill pipe clamp 36 and a breakaway device 38 arranged. In the casing clamp 34 can the casing and in the drill pipe clamp 36 the drill pipe is hydraulically clamped. In cooperation with these clamping devices 34 . 36 allows the breakaway device 38 the loosening of the connections between two pipe sections or two drill pipe sections 30 , In the present embodiment, the connections are made both between the casings and between the pipe sections as screw, so that a casing section using the Futterrohrklemmvorrichtung 34 clamped and with the help of the breakaway device, a second casing section for loosening the screw connection is rotated. After such rotation by means of the breakaway device, the unclamped upper casing section can be removed by means of the drive unit 18 rotated further and the screw connection between the casings completely dissolved. Furthermore, by means of the casing clamping device 34 a lower section of casing to be clamped when another section of casing enters the drilling rig 10 used with the through the casing clamp 34 clamped casing section to be connected.

Similarly, to release the clamping connection between two boom sections of the drill pipe, a first lower boom section using the Bohrgestängeklemmvorrichtung 36 clamped so that it can not perform any rotational movement. With the help of breakaway device 38 becomes a force on a second linkage section exerted for releasing the connection between the two linkage sections. When used in the present embodiment screw this is achieved by means of breakaway device. Example causes 15 ° to 20 ° by means of breakaway device. The further rotation of the upper linkage section then takes place with the aid of the drive unit 18 until the boom sections to be separated are completely unscrewed.

About a auskargenden arm 40 is a manipulator 42 for the simultaneous use of a linkage section 30 and a section of casing into the drilling rig 10 or for simultaneously removing a linkage section and a casing section from the drilling rig 10 connected.

The boom recording 28 surrounding feed tube intake 32 includes a cylindrical tube section 48 , which at its upper end by a cover 50 is closed. The lid 50 has a passage opening, not shown, through which the rod-shaped boom receptacle 28 coaxial with the pipe section 48 is plugged into this. This passage opening is opposite to the boom support 28 sealed by seals which are formed and / or arranged so that they together with the boom support 28 are rotatable. At its lower end is the cylindrical tube section 48 provided with an internal thread, which serves for screw connection with a corresponding male threaded portion of a casing.

Near the lid 50 are in the pipe section 48 formed at least one, preferably a plurality of outlet openings which are separated by webs. These outlet openings are from a pipe section 48 surrounding spout 66 enclosed, a connecting piece 68 for a drain line, so that in a space between the drill string and the casing ascending drilling fluid into the pipe section 48 ascends, through the pipe section 48 emerge existing outlet openings, over the spout 66 and the connecting piece 68 get into the drain line and so from the drilling rig 10 can be carried away.

The spout 66 is opposite the pipe section 48 freely rotatable and freely rotatable relative to the pipe section and sealed by suitable, preferably adjustable, seals above and preferably also below the outlet openings. In particular, these seals are designed and / or arranged such that they together with the pipe section 48 and with the drill pipe or with the Bohrgestängeaufnahme 28 are rotatable. As a result, the wear of these seals can be significantly reduced. The outlet openings, the outlet ring 66 and the connecting piece 68 are used for discharging the drilling fluid, in particular of drilling dust and / or drilling mud, which is expelled upwards between the drill string and the casing pipes. The drilling fluid is preferably forced through the compressed air routed through the hollow drill pipe to the drilling site of the drilling tool into the space between the drill pipe and casing and subsequently to the pipe section 48 and through the outlet opening of the pipe section 48 in the discharge ring 66 , The compressed air is preferably used to drive an arranged at the lower end of the drill pipe Imlochhammers, the exiting the Imlochhammer exhaust air then acts on the removed material, this preferably fluidized and as already mentioned by the space between the drill pipe and casing presses up.

The following briefly describes the function of the drilling rig. In the present embodiment, the sinking of the borehole takes place with the aid of an in-hole hammer which carries a drill head at its lower end. Above the mortar hammer is a transition piece between the first, ie in the vertical orientation of the drill ramp 14 bottom, drill pipe and in-hole hammer, which has a plurality, preferably three, centering, for centering the Imlochhammers within the first, or in the vertical orientation of Bohrrampe 14 serve the lowest casing. The casing carries on the feed pipe receiving 32 opposite end designed as a casing drill bit drilling tool. The length of the transition piece between the drill pipe and the downhole hammer is selected so that the drill head of the in-hole hammer is arranged by a Vormaßmaß before or below the casing crown or projecting the Vormaßmaß from the casing crown, as soon as the first casing and the in-hole hammer with transition piece the drive unit via the linkage recording 28 and the feed tube intake 32 the drilling rig 10 are mounted.

In order to be able to assemble the downhole hammer and the first casing, the casing bit with the first casing and the downhole hammer are bolted to the transition piece. The first casing has two diametrically aligned holes in its lower portion, through which a mounting bolt is inserted. The Imlochhammer is pushed into the first casing. The longitudinal axis of the casing is arranged vertically in the present embodiment. As a result, the transition piece looks so far up out of the first casing, that it with the boom recording 28 can be screwed. The mounting bolt is positioned so that the drill head is set back from its working position by a preset path. When the mounting bolt is removed, the drive unit becomes 18 with the help of the carriage 20 so far at the Bohrrampe 14 drove down that the feed tube intake 32 can be screwed to the first casing. Now the Imlochhammer is turned on by compressed air is supplied. Casing pipe and hole hammer are by a method of carriage 20 downwards at the same time pressed into the ground, until the first casing has almost run its full length into the ground.

The drive of casing and Imlochhammer can in the present embodiment 30 Revolutions per minute. The soil excavated by means of the boring head of the continuous mortar hammer and the casing boring crown is carried upwards by the compressed air emerging from the downhole hammer in the space between the drill pipe and the casing, and through the outlet opening in the pipe section 48 over the spout 66 controlled by the connecting piece 68 dissipated. The casing is placed so far into the ground until it is just safe from the casing clamp 34 can be detected. The hole hammer is stopped and the feed tube receiving 32 unscrewed from the casing. Subsequently, the drive unit via the carriage 20 and the drive 22 moved up by a preset distance, so now the transition piece connected to the Imlochhammer 80 from the linkage clamping device 36 clamped and the boom recording 28 can be unscrewed.

All clamping and screwing operations are hydraulically, the clamping devices 34 . 36 are controlled so that they the casing pipes and the rod sections or the transition piece 80 hold reliably until an operator the clamps 34 . 36 opens again. After releasing the boom pickup 28 the feed pipe receiving 32 from the first casing and the transition piece is the drive unit 18 with the help of the carriage 20 and the drive motor 22 so far up that with the help of the manipulator 42 at the same time a linkage section and a casing section into the drilling rig 10 can be used. The inserted pipe section and the inserted linkage section have the same effective length, for example 1.5 meters or 2.5 meters. The threads on the linkage sections and the casing sections preferably have the same direction of rotation, so they are designed either as right-hand or left-hand threads. By means of a corresponding return stroke, first the rod section of the drill rod can be screwed to the transition piece and the rod holder. Then the linkage clamp is released and the drive unit 18 over the sledge 20 lowered so far that the inserted casing with the already introduced casing and the feed pipe receiving 32 can be screwed. Thereafter, the drill head is again to the flow rate in front of the casing crown. The downhole hammer is then turned on and the next length of casing or pipe section length introduced.

The process described above is repeated until the casings meet rock. Subsequently, the Imlochhammer continue drilling with the drill pipe alone, as in the rock, a well stabilization through casings is no longer mandatory. Preferably, the Futterrohraufnahme 32 with the pipe section 48 and the spout 66 from the drive unit 18 dissolved, so that the casing is then no longer driven, but ascending drilling mud or ascending drilling fluid can be discharged further controlled. In the following, further linkage sections are mounted and the drill pipe is introduced into the ground around these further linkage sections until the final borehole depth has been reached.

If loose rock is encountered below the rock layer again, so that the well in this area must be stabilized again with casings, the casings are laid through the rock layer. The Imlochhammer is pulled out completely. The drill head of the Imlochhammers is replaced by a Exzenterbohrkopf. This comprises, in a manner known per se, two halves which fit through the casing sections in the normal position. As soon as the eccentric drilling head is located in its drilling position below the lowest casing and the drill bit connected to the lowest casing, the eccentric drilling head is rotated in the working direction so that the two eccentric halves move outwards relative to one another. As a result, the bore diameter is greater than the outer diameter of the casing pipes, so that the borehole is extended sufficiently for the introduction of the casing pipes accordingly.

Once the final drill hole depth has been reached, the drill string is pulled completely upwards with the downhole hammer and disassembled in sections.

In the well channel formed by the casing, for example, a ground probe for geothermal energy or a well pipe or other desired media pipe or the like is discharged. Then the casings are pulled upwards and dismantled. When disassembling the drill pipe sections or casing sections, the clamping devices 34 . 36 as well as the breakaway device 38 the drilling rig 10 used. They are used as described above to the threaded connections between two pipe sections or between two linkage sections or a linkage section and the To solve transition piece or another provided between the linkage sections or casings pipe connection. The loosening of the respective threaded connection takes place in that the linkage clamping device 36 that of the boom pickup 28 seen from second linkage section jams and the breakaway device 38 the first one, with the boom recording 28 connected linkage section 30 clamps and rotates over the clamping connection thus produced. Once the threaded connection between the first and the second linkage section is released (for example, by a 20 ° rotation), the drive unit 18 the two rod sections 30 completely unscrew. To release the first linkage section 30 from the pole recording 28 may be the first linkage section 30 with the help of breakaway device 38 clamped and fixed and with the help of the drive unit 18 to be turned around. In the same way, the connection between two sections of casing can be solved. To do this, clamp the casing clamping device 36 that of the feed pipe intake 32 seen second casing section and the breakaway device 38 clamps the first, with the feed tube recording 32 connected feed pipe section and turns it. Once the threaded connection between the sections of casing is released, the drive unit can 18 completely unscrew the sections of casing. The first casing section can subsequently with the help of breakaway device 38 clamped and fixed, so that the screw connection between the first casing section and the feed tube receiving 32 through the drive unit 18 can be solved.

In 2 is a section of the drilling rig after 1 shown in an enlarged view. Like elements have the same reference numerals. In the longitudinal direction of the drill string 14 In this embodiment, the drill string receptacle is 28 and the feed tube intake 32 relative to each other in discrete steps over two oppositely arranged by two holes 90 . 92 ; 94 . 96 formed hole grid 70 . 72 displaceable. An outer tube 74 is opposite one with the sled 20 connected inner tube 76 slidably disposed and can at a desired connection point via bolts 78 to 84 with the hole grids 70 . 72 get connected. In the concrete embodiment, the outer tube 74 between the drive head 18 and the spout 66 arranged, being between the discharge ring 66 and the outer tube 74 the lid 50 is arranged. The spout 66 is about two bars 86 . 88 and over the bolts 78 to 84 with the breadboard bars 90 to 96 connected, the outer tube 74 on the lid 50 seated. Alternatively, the outer tube 74 also on a corresponding bearing on the lid 50 seated. Between the bridges 86 . 88 and the breadboard rails 90 to 96 is the outer tube 74 freely rotatable. As follows in connection with the 5 to 8th is still explained, are in the outer tube 74 provided inwardly projecting engagement elements in the form of introduced into the wall of the outer tube inwardly projecting bolts, which in a torque-transmitting connection with the outer toothing of the inner tube 76 stand, so that with the outer tube 74 coupled feed pipe intake 32 and those with the inner tube 76 coupled pole picking 28 upon rotation of the drive spindle 26 be turned together. In 2 is the outer tube 74 in a first upper position relative to the inner tube 76 arranged so that the drill bit connected to the lower end of the drill string, ie the drill bit arranged on the hole hammer, protrudes over a maximum length from the annular tube crown connected to the casing tube.

3 shows the section of the drilling rig 10 to 2 , wherein the Futterrohraufnahme 32 relative to the Bohrgestängeaufnahme 28 is arranged in a second middle position and fixed in this position. These are the with the spout 66 connected struts 66 . 68 by removing the bolts 78 to 84 from the hole grid struts 90 to 96 solved, moved down and over the bolts 78 to 84 in a middle position with the hole grid struts 90 to 96 been connected. The "move downwards" of the discharge ring 66 can be done in particular by the fact that the feed pipe receiving 32 connected to a casing and the carriage 20 via the drive unit 22 has been moved to a corresponding travel up, so that the drive head 18 together with the inner tube 76 has been moved upwards in the longitudinal direction of the linkage. In this embodiment, the length of the linkage sections, the length of the feed pipe sections, the length of the transition piece and / or a possibly existing Imlochhammers are selected so that in the in 3 shown middle position has the drill bit connected to the drill pipe or with the hole hammer the same working plane as the ring bit connected to the casing.

In 4 is the cutting of the drilling rig 10 after the 2 and 3 represented, wherein the feed tube receiving 32 is arranged in a third lower position. This was done in the same way as already in connection with 3 described the connection between the struts 86 . 94 . 96 . 88 . 90 . 92 solved and the drive spindle 26 together with the sled 20 through the drive unit 22 moved up, so the struts 86 . 88 with the hole grid struts 90 to 96 over the lower two holes of the hole grid struts 90 to 96 and the connecting bolts 78 to 84 are connected. The connecting bolts 90 to 96 are in the present embodiment with the help of Securing elements, such as securing split pins, when passing through the struts 90 . 88 . 92 respectively. 94 . 86 . 96 are guided. As an alternative to the bolt connections suitable screw connections can be provided, wherein the screws in an internal thread at least one hole strut 92 . 96 can be screwed.

In 5 is an enlarged perspective view of the inner tube 76 shown, which is a connecting element of the connection unit 27 for torque transmission between the drill pipe support 28 and the feed pipe receiving 32 serves. The inner tube 76 has an external toothing, in the engaging elements of in 6 illustrated outer tube 74 engage, with the outer tube 74 as a connecting element between the inner tube 76 and the pipe section 48 the pole recording 32 serves. This in 6 illustrated outer tube 74 has in the upper end region and in the lower end region in each case two along the inner circumference projecting bolt arrangements, wherein the two upper bolt arrangements, of which in each case a bolt with 100 respectively. 102 is designated in the outer toothing of the inner tube 76 engage and in the direction of the longitudinal axis of the drill string, ie in the direction of the double arrow A, in the outer toothing of the inner tube 76 can be moved. The lower ones along the inner circumference of the outer tube 74 protruding bolts, each of which is a bolt with 104 respectively. 106 is designated, engage in an external toothing, which at the upper end of the tube 48 is provided. Likewise, the lid 50 on the pipe 48 educated. The lid 50 is rotatable with respect to the discharge ring 66 arranged, preferably via a corresponding bearing and with respect to the discharge ring 66 sealed. On opposite sides of the discharge ring 66 are tabs 108 to 114 educated. In these tabs are the connecting rods 86 . 88 taken up and over in each case at least one bolt, which by in the tabs 108 to 114 provided through holes and in the bars 86 . 88 provided through holes, are connected.

In 7 is a partially sectional view of the connection unit 27 from inner tube 76 and outer tube 74 shown in which the cut illustrated bolts of the upper bolt assemblies in opposite longitudinal grooves of the external teeth 76 engage the inner tube.

In 8th is a sectional view of a plan view of the connection assembly 27 between inner tube 76 and outer tube 74 along the section line SS 7 shown. In this illustration, it can be seen that the circumferentially arranged, inwardly projecting bolts of the upper bolt assembly each in a longitudinal groove of the outer toothing of the inner tube 76 engage and so circumferentially allow torque transmission. In alternative embodiments, the bolts may be shaped such that the inner pipe 76 to the outer tube 74 flank-centered.

In 9 is shown a section of another drill rig, the possibility of a continuous length adjustment of the relative position of the feed tube receiving 32 for pole picking 28 shows. Except for as a hydraulic cylinder 120 . 122 trained adjusting and connecting elements, the the hole grid bars 90 to 94 and the connecting rods 86 . 88 replace is the drilling rig according to the second embodiment according to 9 identical and agrees with the function of the drilling rig 10 after the 1 to 8th of the first embodiment. With the help of the hydraulic cylinder inner and outer tube can 76 . 74 be moved and positioned continuously over the entire adjustment range, so that at the opposite end of the drill pipe and the casing, the drilling tool connected thereto can be positioned in the desired manner relative to each other.

For better visualization of the position of the drilling tools to each other can be arranged on the connection assembly, a scale and a pointing means indicating the position or the distance of the associated with the casing drilling tool and connected to the drill string drilling tool or visualized.

In 10 is a partially sectional view of the drive head 18 the drilling rig 10 after the 1 to 8th shown in the rotatable mounting of the sealing elements 132 to 134 in a rotating seal cage 136 is shown. The sealing cage 136 is opposite the seal cover 140 about a first camp 142 and opposite the spout 66 about a second camp 144 rotatably mounted so that it by the adhesion forces between the seals and the rod support 28 and / or by a connection between the sealing cage 138 and the outer tube 74 during a rotary movement of the outer tube 74 and / or linkage is moved. As a result, no occurs by the rotation of the boom recording 28 caused relative movement between the seals 130 to 134 and the stick recording 28 but only in a relative movement according to the invention between boom recording 28 Casing Recording 32 over the breadboard rails 90 to 96 or via the hydraulic cylinder 120 . 122 , Furthermore, gaskets 150 . 152 for sealing the spout against the pipe 48 intended.

In 11 is a separate representation of the boom recording 28 , the seal cover 140 , the rotating seal biasing element 142 and the rotating seal cage 138 as well as the warehouse 144 shown.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102008003968 B3 [0002, 0002]

Claims (15)

Drilling rig for drilling holes in the ground, with a drilling rig ( 14 ), and with one on the drilling rig ( 14 ) slidably arranged drive unit ( 18 ), wherein the drive unit ( 18 ) a stick recording ( 28 ) for detachable connection to a drill string and at least one drive motor ( 24 . 25 ), wherein the drive motor ( 24 . 25 ) with the boom support ( 28 ) is in a torque-transmitted connection, wherein the drive unit ( 18 ) one for stick recording ( 28 ) coaxial liner receiving ( 32 ) for detachable connection to a casing, and wherein the drive unit ( 18 ) at least one drive motor ( 24 . 25 ) and coupling means for the torque-transmitted connection between the drive motor ( 24 . 25 ) and the Futterrohraufnahme ( 32 ), characterized in that means ( 27 ) are provided in the direction (A) of the longitudinal axis of the drill string, a displacement of one of the rod support ( 28 ) opposite the end of the drill pipe arranged opposite the drill pipe receiving tool to create and / or to change such an offset. Drilling rig according to claim 1, characterized in that the means ( 27 ) the offset by a relative movement of the feed tube receiving ( 32 ) and the boom recording ( 28 ) in the direction of the longitudinal axis of the drill pipe. Drilling rig according to claim 2, characterized in that the means for generating the offset of the boom support ( 28 ) and the Futterrohraufnahme ( 32 ) are designed such that the offset is infinitely adjustable. Drilling rig according to claim 2, characterized in that the means for generating the offset between feed pipe receiving ( 32 ) and drill string receiver ( 28 ) are designed such that the offset is adjustable in discrete sections. Drilling rig according to one of the preceding claims, characterized in that a drill pipe is provided which has a plurality of interconnected drill pipe sections ( 30 ) that a casing is provided comprising a plurality of interconnected sections of casing, and that the means ( 27 ) for generating the offset at least one linkage section ( 30 ) and a casing section having a different length such that, depending on the selection of at least one pipe section ( 30 ) and / or at least one casing section the drill tool connected to the linkage protrudes from the drilling tool connected to the casing, which is connected to the casing ( 32 ), the drilling tool connected to the linkage, or the drilling tool connected to the linkage and the drilling tool connected to the casing have approximately the same working plane. Drilling rig according to claim 5, characterized in that the casing sections have the same length that at least a first linkage section ( 30 ) has the same length as the casing sections, that at least a second linkage section has a shorter length than the casing sections and / or that at least a third linkage section has a greater length than the casing sections, or that the linkage sections have the same length that at least one first casing section is the same Length as the linkage sections has that at least a second casing section has a shorter length than the linkage sections and / or that at least a third casing section has a greater length than the linkage sections. Drilling rig according to one of the preceding claims, characterized in that the coupling means a on the boom support ( 32 ) and one for engaging with this particular at the Futterrohraufnahme ( 32 ) arranged rotational stop ( 104 . 106 ). Drilling rig according to one of the preceding claims, characterized in that the boom support ( 28 ) and the feed pipe intake ( 32 ) about the boom picking ( 28 ) with the same drive motor ( 24 ) or the same drive motors ( 24 . 25 ) can be coupled. Drilling rig according to one of the preceding claims, characterized in that the drill string is connected to a pressure medium operated downhole hammer, wherein the pressure medium can be supplied through the hollow drill string formed. Drilling rig according to claim 9, characterized in that the down-hole hammer as a drilling tool carries a drill head whose outer diameter is smaller than the inner diameter of a casing. Drilling rig according to claim 9, characterized in that the perforated hammer carries a drill bit as Exzenterbohrkopf whose smallest outer diameter is smaller than the inner diameter of a casing and whose largest outer diameter is greater than the outer diameter of a casing. Drilling rig according to one of claims 9 to 11, characterized in that between the drill string and the downhole hammer, a transition piece is arranged, which is provided with radial centering webs. Drilling rig according to claim 12, characterized in that the axial length of the transition piece is selected so that when using linkage sections ( 30 ) and feed pipe sections of the same length which formed as a drill head connected to the drill string drilling tool protrudes from the drill pipe mounted on the drilling tool. Drilling rig according to one of the preceding claims, characterized in that the casing reception ( 32 ) a cylindrical pipe section ( 48 ), which is connectable at its drive unit remote ends with a casing, that the cylindrical pipe section ( 48 ) at its the drive unit ( 18 ) end facing by a lid ( 50 ), which has a passage opening ( 52 ) for the boom recording ( 28 ), and that the cylindrical pipe section ( 48 ) has at least one outlet opening for a drilling fluid near its drive-side end and from an outlet ring (FIG. 66 ), which is opposite the pipe section ( 48 ) is freely rotatable, wherein the spout ( 66 ) an outflow ( 68 ) has for the drilling fluid, wherein the passage opening in the lid ( 50 ) relative to the boom ( 28 ) by at least one seal ( 130 to 134 ) and the seal ( 130 to 134 ) is arranged and / or formed such that it together with the drill string ( 30 ) is rotated. Drilling rig according to claim 14, characterized in that the seal ( 130 to 134 ) is arranged in a seal receptacle which is rotatable to the discharge ring ( 66 ).

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