DK3163009T3

DK3163009T3 - Device for connecting a drilling tool to the rotary drive head of a drilling device

Info

Publication number: DK3163009T3
Application number: DK15191464.5T
Authority: DK
Inventors: Michael Grzeszick; Ralf Kister
Original assignee: Gmt Ges Fuer Maschinentechnik Mbh
Priority date: 2015-10-26
Filing date: 2015-10-26
Publication date: 2018-05-28
Also published as: EP3163009B1; SI3163009T1; CY1120161T1; RS57189B1; PT3163009T; LT3163009T; NO3163009T3; ES2667811T3; HUE037117T2; HRP20180627T1; PL3163009T3; EP3163009A1

Description

[0001 ] The invention relates to a device for connecting a tubular drilling tool to the power rotation head of a drilling device according to the preamble of claim 1.

[0002] When deeper bore holes are drilled, they are regularly lined with drill pipes in order to prevent the sliding-down of soil. With increasing depth of the hole, the tubing has to be appropriately continued into the depth. For this purpose, individual drill pipes are joined together and the string of drill pipes thus formed is pressed as such into the ground. In order to facilitate this movement, the whole drill string is set in rotation by means of the power rotation head of a drilling device.

[0003] The junction between the power rotation head of the drilling device and the drilling pipe to be respectively relocated is up to 6 m above the ground. In order to connect the respective drilling pipe to the connection pipe of the power rotation head, manual connection respectively requires one person to climb up a ladder to the junction and insert the required connection bolts. Alternatively, this is carried out by means of a telescopic bar from the ground plane of the drilling device. As the drill pipes typically have a diameter of 600 to 2000 mm, the ladder for inserting the individual connection bolts has to be repositioned several times. It is thus time-consuming and dangerous to establish the mechanical connection between the drill pipe to be respectively located and the connecting pipe. After completion of drilling, the drill string is removed from the hole by turning and pulling of the power rotation head. As soon as a drill pipe is completely above the ground, it is separated from the string part below. Subsequently, the connection between the drill pipe end and the connection pipe of the power rotation head of the drilling device has to be separated at high altitude in an analogue manner.

[0004] In order to tackle this issue, CH 675747 A5 suggests to automatically establish and separate the mechanical connection between the upper drill pipe end and the connecting pipe of the power rotation head via a remote-controlled locking coupling between the connecting pipe and the upper drill pipe end. In this regard, the locking coupling comprises coupling pins, which can be inserted in aligned holes at the lower end of the connecting pipe or the upper drill pipe end by means of a servo drive means. In this regard, the servo drive means is either formed by an actuating ring, which is connected via a pinion drive, or by hydraulic actuators, the piston rod ends of which form the coupling pins.

[0005] The known solution is disadvantageous in that it is very complex. Furthermore, the feeding of pneumatic or hydraulic fluids via rotary joints is often prone to error and leakage. EP 1 624 151 A2 discloses a receptacle for a tubular drilling tool, in which a radially arranged locking bolt is arranged, which engages in a corresponding opening of the drilling tool and which is rotatable by a crank-shaped lever arranged transversely to the axis of rotation with a pressure cylinder acting thereon.

[0006] The invention seeks to remedy this problem. The invention is based on the problem to provide a device for connecting a tubular drilling tool to the power rotation head of a drilling device which is of simple construction and in which the above-mentioned disadvantages are prevented. According to the invention, this problem is solved by a device having the features of the characterising portion of claim 1.

[0007] The invention provides a device for connecting a tubular drilling tool to the power rotation head of a drilling device which is simply constructed and in which the above-mentioned disadvantages are prevented. Due to the arrangement of means for autonomous energy production directly at the connecting tube, a rotary joint for pneumatic or hydraulic fluids is not required.

[0008] The actuator is formed by a hydraulic or pneumatic cylinder. As a result, mechanically particularly simple construction is allowed for.

[0009] Furthermore, the means for autonomous energy production comprise at least one pump cylinder which is connected to a pressure vessel, to which the at least two actuators are connected. As a result, a simply constructed and at the same time robust energy store is provided.

[0010] The pump cylinder is operated via control means which are operable by inserting a drilling tool to be received into the connecting tube. As a result, supply and storage of the kinetic energy provided by inserting the drilling tool, is achieved.

[0011] The locking bolt is connected to the actuator via a rocker, wherein the rocker is prestressed via a spring element in a closing position of the locking bolt. As a result, a simple mechanical diversion of the kinetic energy supplied by the actuator in the displacement direction of the locking bolt is achieved. By prestressing the locking bolt via a spring element in the closing position, energy supply is only required for unlocking the locking bolt, whereby the energy requirement is reduced. Simultaneously, an unwanted sliding out of the locking bolts due to failure of the means for autonomous energy production is prevented.

[0012] In this regard, the spring element is incorporated in the actuator. As a result, a compact construction is achieved.

[0013] In a further development of the invention, the control means comprise a connecting rod which is operable by a drilling tool to be received. As a result, a simple mechanical supply of the kinetic energy to the pump cylinder is allowed for.

[0014] In an alternative embodiment of the invention, the control means are formed by the connecting tube itself, which is vertically movably mounted in a receiving head. By inserting the drilling tool, a vertical change in position of the connecting tube is achieved in this manner, whereby again a transfer of the kinetic energy to the pump cylinder is allowed for.

[0015] In a further embodiment of the invention, the actuator is connected to a radiocontrol unit, via which it can be remote-controlled. As a result, locking and unlocking of the connection between drilling tool and connecting tube outside the immediate working area is allowed for.

[0016] In a further development of the invention, the at least two locking bolts are conically designed at their end facing away from the rocker. As a result, the insertion of the respective locking bolt into the respective opening of the drilling tool is facilitated.

[0017] In a further embodiment of the invention, the end of the locking bolt facing away from the rocker has a control surface set at an angle. As a result, a pushing-out of the locking bolt by inserting a drilling tool into the connecting tube is achieved. The control surface allows for a smooth sliding-off of the locking bolt along the inserted drilling tool, whereby tilting of the drilling tool against the locking bolt is prevented. Preferably, the control surface is set at an angle of between 20° and 40°, preferably at an angle of 30° to the end face of the locking bolt.

[0018] Other developments and embodiments of the invention are indicated in the remaining dependent claims. Exemplary embodiments of the invention are shown in the drawings and are described in detail as follows. It is shown in:

Figure 1 the schematic representation of a device for connecting a tubular drilling tool to the power rotation head of a drilling device;

Figure 2 the representation of the connecting tube of the device of figure 1;

Figure 3 the detailed representation of the connecting rod arrangement of the connecting tube of figure 2 a) before receiving a drilling tool; b) after the drilling tool is received in half and c) after receiving the drilling tool;

Figure 4 the schematic representation of a device for connecting a tubular drilling device in a further embodiment; a) in lateral view; b) in a lateral view tilted by 90°; c) in a partial sectional view from above;

Figure 5 the detailed representation of the locking bolt arrangement IV of figure 4;

Figure 6 the representation of the locking bolt arrangement of figure 5 a) before insertion of the drilling tool into the connecting tube; b) after partial insertion of the drilling tool into the connecting tube; c) after completed insertion of the drilling tool into the connecting tube; Figure 7 the schematic detailed representation of the locking bolt of the locking bolt arrangement of figure 5.

[0019] Figure 1 shows an inventive device at the power rotation head 2 of a drilling device. The device comprises a connecting tube 1 provided with an end face 13, which is connected to a universal joint 21 arranged at the power rotation head 2 via a tab 11 arranged at the end face 13. The connecting tube 1 transmits pressing and tensile forces as well as the torque of the power rotation head 2 to a received drill pipe 6. At its end opposite the tab 11, at least two locking devices 3 are arranged diametrically opposite one another at the connecting tube 1. The locking devices 3 comprise a hydraulic cylinder 31, respectively, which is connected via a rocker 32 to a locking bolt 33, which is movably mounted in a duct 12 of the connecting tube 1. In the hydraulic cylinder 31, a disk spring assembly - not shown - is incorporated, by means of which the piston 311 connected to the rocker 32 is prestressed in a manner that the locking bolt 33 in the idle

State is pressed through the wall of the connecting tube 1 in the direction of its central axis.

[0020] The piston 311 is connected via a hydraulic line - not shown - to a piston accumulator 4. In the exemplary embodiment, the gas side of the piston accumulator 4 is filled with nitrogen. The piston accumulator 4 again is connected via a line - not shown - via a hydraulic tank 44 to a pump cylinder 41, to the piston 411 of which a connecting rod 42 is attached. The hydraulic tank 44 serves the supply of the piston accumulator tube with hydraulic oil. At its end opposite the pump cylinder 41, the connecting rod 42 is provided with a push claw 43, which protrudes through an opening 17 of the connecting tube 1 into same. Between the piston accumulator 4 and the hydraulic cylinders 31 of the locking devices 3, a control valve 5 is arranged, which can be controlled via a radio control 51.

[0021] The locking device 3 is shown in detail in figure 5. As can be seen, the piston 311 of the hydraulic cylinder 31 is connected to the rocker 32, which is pivotably mounted via a link bracket 36 and is connected to the locking bolt 33 at its end opposite the piston 311. The locking bolt 33 is movably guided in the duct 12 of the connecting tube 1, which duct is designed in the manner of an outwardly protruding sleeve for this purpose.

[0022] The locking bolt 33 is shown in detail in figure 7. The locking bolt 33 is substantially cylindrical and has a substantially cuboid connector 35 at its end facing the rocker 32, which connector is provided with a duct 351 for connection to the rocker 32. At its end opposite the rocker 32, the locking bolt 33 is conically tapered and provided with a control surface 34, which is set at an angle to the end face of the locking bolt 33. In the exemplary embodiment the control surface 34 has an angle of 30° to the end face of the locking bolt 33.

[0023] The two locking devices 3 arranged at the connecting tube 1 are protected towards the outside by a cover 7, which is at a distance from the connecting tube 1 pivotably connected to same.

[0024] In order to connect a drill pipe 6 to the connecting tube 1 arranged at the power rotation head 2, the drill pipe 6 is pushed into the connecting tube 1 until the diameter-reduced section 63 at the end of the drill pipe 6 is fully received by the connecting tube 1, so that it rests on the shoulder 61 of the drill pipe 6 formed by the diameter-reduced section 63. When inserting the drill pipe 6 into the connecting tube 1, the diameter-reduced section 63 at the end of the drill pipe 6 is guided along the control surface 34 of the locking bolts 33, so that they are pressed outwards through the ducts 12 of the connecting pipe 1 against their prestress. Simultaneously, the diameter-reduced end section 63 of the drill pipe 6 is received by the push claw 43 of the connecting rod 42 protruding through the opening 17 into the connecting tube 1, which is moved upwards by the drill pipe 6 in the direction of the tab 11 of the connecting tube 1. As a result, the piston 411 of the pump cylinder 41 connected to the piston accumulator 4 is moved, whereby hydraulic oil from the hydraulic tank 44 is pumped into the piston accumulator 4, whereby overpressure is formed there. In the end position of the drill pipe 6, in which the shoulder 61 rests on the connecting tube 1, the conical ends of the prestressed locking bolts 33 glide along the duct 12 of the connecting tube 1 through the connecting tube 1 into the connecting bores 62 aligned with the ducts 12 of the drill pipe 6, thereby positively connecting the drill pipe 6 with the connecting tube 1.

[0025] In order to release the connection between the drill pipe 6 and the connecting tube 1, the control valve 5 connected to the radio control 51 can be remote-controlled. Due to the hydraulic oil overpressure built up before in the piston accumulator 4, the hydraulic cylinders 31 of the locking device 3 are now actuated, whereby the locking bolts 33 are moved out of the connecting bores 62 of the drill pipe 6 against their prestress. If no further signal is sent to the radio control 51, the control valve 5 switches in the initial position and the hydraulic oil quantities in the hydraulic cylinders 31 flow off into the hydraulic tank 44. Due to the prestressing force acting on the locking bolts 33 by the spring assemblies incorporated in the hydraulic cylinders 31, they are moved backed into the “locked” position through the ducts 12 of the connecting tube 1.

[0026] In the exemplary embodiment according to figure 4, the end face 13 provided with the tab 11 of the connecting tube 1 is connected to the connecting tube 1 via a collar 14 enveloping the connecting tube 1 arranged at the end face. Two long slots 15 are inserted diametrically opposed to each other in the collar 14, in which an axis 16, respectively, arranged at the connecting tube 1 engages, so that the end face 13 provided with the collar 14 is movable relative to the connecting tube 1. In this exemplary embodiment no connecting rod is arranged at the connecting tube 1. The pump cylinders 41 are arranged at the connecting tube 1 beneath the circumferential collar 14, wherein the pistons 411 of the pump cylinders 41 are connected to the collar 14. The filling of the piston accumulator 4 with hydraulic oil is achieved in this exemplary embodiment by a relative movement between the connecting tube 1 and the end face 13, whereby the pistons are moved inside the pump cylinders 41, which pump cylinders 41 are again connected to the piston accumulator 4 via the hydraulic tank 44. The relative movement between the connecting tube 1 and the end face 13 is carried out during the reception of the drill pipe 6, wherein the connecting tube 1 is slipped over the drill pipe 6, whereby the end face 13 is pressed onto the connecting tube 1 with the pistons 411 of the pump cylinders 41, which are attached to the end face via the collar 14, whereby the pump cylinders 41 are actuated.

[0027] The device according to the invention is particularly distinguished by the fact that the locking bolts in an idle position are prestressed via spring assemblies in the locking position and that the hydraulic system required for releasing the locking bolts is absolutely autonomous and does not require any external energy supply. The required energy is gained in the system by the pump cylinders, which are exclusively actuated via the insertion movement of the drill pipe into the connecting tube.

Claims

Device for connecting a tubular drill bit to the rotary drive head of a drill device, with a connecting tube and at least two radially arranged locking bolts passing through the connecting tube and engaging a corresponding opening in a drilling tool, wherein at least two actuators are formed by hydraulic cylinders (31) are provided by means of which at least two locking bolts can be moved, means for independent energy generation are provided through which at least two actuators can be operated, the means for independent energy generation comprising a pump cylinder (41). ), which is connected to a pressure vessel (4) with which they are connected to at least two actuators, the pump cylinder (41) being operated via actuators which can be driven by the insertion of a drilling tool (6) to be received into the connecting pipe ( 1), characterized in that each of the at least two locking bolts (33) is connected to the hydraulic cylinder (31) via a a rocker arm (32), the rocker arm (32) being biased via a spring element in the locking position of the locking bolt (33), which spring element consists of a plate spring package integrated into the hydraulic cylinder (30), through which a piston (311) connected to the rocker cylinder (31) ) is biased so that in the idle state the locking bolt (33) is pushed through the wall of the connecting tube (1) in the direction towards its center axis.

Device according to claim 1, characterized in that the operating means comprise a connecting rod (42) which can be operated by a drilling tool to be received.

Device according to claim 1, characterized in that the operating means are formed by the connecting tube (1), which is vertically displaceably mounted in a holding head.

Device according to any one of the preceding claims, characterized in that the at least two actuators are connected to a radio control (51) via which these can be controlled remotely.

Device according to any one of the preceding claims, characterized in that the at least two locking bolts (33) are formed at their end facing away from the rocker arm (32).

Device according to claim 5, characterized in that the locking bolts (33) at their end facing away from the rocker arm (32) have an angled guide surface (34).

Device according to claim 6, characterized in that the guide surface (34) is positioned at an angle of 20 ° to 40 °, preferably at an angle of 30 °, relative to the end surface of the locking bolt (33).