DE1933247A1 - Holding and centering device for a deep drilling device - Google Patents

Description

PATENT LAWYERS

DH. ing. H. NEGENDANK · dipl-ing. H. HAUCK Dipl.-Phys. W. SCHMITZ

HAMBTJRO - MUNICH ZUSEHTNOSANSCHIFT: HAMBUHG 86 NETTER WAUL 41

TEI .. 3Θ 74 38 AND 30 41 10

TELBOR. NEOEDAPATBNT HAMBURG MUNICH 15 MOZAHTSTH. 23

ΤΚΙ, .3 38 05 80

TBLEGR. NBGEDAPATENT MUNICH

Hamburg, June 30, 1969

Byron Jackson Incorporated!
6505 Paramount Boulevard,
Long Beach, Caliph. (V.St.A.)

Holding and centering device for a deep drilling device.

for this registration the priority is derived from the corresponding U.S. application serial no. 742 258 of July 3, 1968 taken.

The invention relates to a pipe holding and centering device for a deep drilling device in which a length of pipe is held on a rig installed on the work platform, the work platform with respect to a tubing string suspended in the borehole is movable and is held by a main gimbal. she Centering device according to the invention is used below of the main gimbal insert into engagement with the pipe string to be brought and to deflect this in such a way that it hung with the in the derrick Pipe length is aligned to allow the pipes to be screwed together. You centering device has

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opposing, hydraulically operated pressure pistons on, through which the held by the cardan main insert " Pipe string can be clamped and relocated, whereby a pressure piston is relieved of the hydraulic pressure, when the derrick is in relation to the one in the main gimbal held pipe string moved too much.

When bringing back off-shore deep boreholes from one ™ floating pontoon or ship that is subject to the impact is exposed to wind and waves, problems arise when screwing the screw connections or linkage connectors between a length of pipe suspended within the derrick and the upper end of a pipe string extending from the main stake is held. When the top of the tubing string held in the main insert begins to move with respect to the ship is hindered by being held in such a position with the exertion of a force, in which is the threaded sleeve located at the upper end of the string in axial alignment with a pipe length, which is to be attached to the pipe string, the upper end of the pipe string, which is firmly held by the main insert, is exposed to the movements of the ship at all times, such as the pitching and rolling of the ship caused by the wave movements.

Attempts have already been made to solve some problems when drilling deep from a floating vehicle

909884/0392

from., For example, the ship is provided with a device that turns the ship's bow in the direction of the incoming waves by moving the ship around a stationary one central ship section is rotated so that the rolling of the ship is reduced to a minimum. However, this does not prevent the ship from pitching which results from the ship's bow pointing in the direction of incoming waves shows. A firm clamping of the upper end "of the pipe string held within the turntable leads not only to bending of the pipe string during the production of the screw connections, but even during the drilling process, which means there is a risk of fatigue in the drill rod.

When the top of the drill pipe in the conventional Cardan main insert is held, which is a pounding or Allows the ship to roll in relation to the drill pipe, misalignments occur between a length of pipe, suspended in the moving derrick and the top of the drill string held in the main insert. Therefore, it is difficult to insert the spigot end of the length of pipe suspended in the derrick into the socket end of the main insert held drill string, so that there is a high probability that the threads to each other be tilted.

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The device according to the invention is with the holding device for the drill string in the main gimbal insert below of the derrick, in which a bonr rod length to be attached to the drill string held by the main insert. The arrangement allows the drill string below the main gimbal insert hold and deflect to momentarily bend the drill string during) screwing in, causing the main gimbal insert aligned with the length of pipe suspended in the derrick.

In particular, a Zentrierkolbenvorrichtung, is by the invention proposed, which is actuated by a pressurized hydraulic fluid to come below the gimbal main insert into engagement with the drill string and the drill string with the axis of the main insert located below the main insert orientation W may th, so that the section of drill string protruding up through the gimbal main liner is aligned with a length of drill string suspended in the derrick in the same manner as if the main liner had no gimbal in the conventional manner and held the top of the drill string so that the main liner and the drill string are aligned coaxially with one another at all times. The centering piston device is actuated briefly and only when a drill string length (including the

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Usual drive rod) with the through the main use; held Drill string is intended to be connected so that the drill string is not subjected to bending stresses during normal drilling operations when the ship is floating Performs stomping or rolling movements.

The centering piston assembly is designed to reduce the bending forces exerted on the drill string or disappear to the drill string with the drill string suspended in the derrick aligned when the pitching or rolling of the ship becomes so great that the load the drill string would become too large and the risk of damage or breakage of the drill string consists.

The centering piston device according to the invention is adjustable so that it has tubes of different sizes or Pick up and center diameter, from relatively small drill rods to relatively large casing pipes can. For this purpose, a selection device is provided, through which the size of the mutually directed and the displacement of the centering piston, which serves to center the tube, can be limited.

The centering piston device according to the invention consists of centering chucks which are stretched in the horizontal direction by hydraulic pressure piston pairs, which the centering chuck

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wear at their ends, in the direction of a center line running downward from the KardanHaupte ineat ζ can be moved back and away from this, so that the centering chucks come into engagement with the pipe string at any point on their displacement path and this through the mutual movement be able to bring the S ¹ utter progressively in the closing direction into a central position between the putters. W devices serve to distribute the supplied from a fluid source hydraulic fluid to each pair of the pressure piston on a centering device, so that at the two ends of each pilot probe large Scnließkräfte be equal exercised.

The hydraulic distribution system also has devices that serve to control the closing systems of the pressure pistons to adjust to each other at periodic intervals, so prevented during the centering process on a pipe * one centering chuck will move a greater distance than another centering chuck

Other features as well as advantages of the invention are from the following description of a preferred embodiment can be seen, which is explained in more detail in connection with the drawings.

Fig. 1 is a side elevational view of a drill ship showing

with a derrick, as well as with the invention

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Holding and centering device is provided.

2a and 2b together show a side view of the Derrick and deck section of the ship, on a larger scale and along the line . 2-2 of FIG. 1, FIG. 2b being the downward extension of FIG. 2a.

Fig. 3 is a schematic illustration showing the possible angular alignment between a drill string supported by a main gimbal insert the floating ship is held, and a length of drill rod that is in the derrick on the Ship is hung up.

FIG. 4 is a horizontal section along line 4-4 of FIG. 3.

FIG. 5 is a representation corresponding to FIG. 3 and shows how the centering device aligns the drill string with that in the derrick suspended drill pipe length.

FIG. 6 is a horizontal section taken along line 6-6 of FIG. 5.

Fig. 7 is a partial horizontal section, wherein the centering device according to the invention shown in plan view along the line 7-7 of FIG. 2b is.

FIG. 8 is an elevational cross-section taken along line 8-8 of FIG. 7.

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Pig. 9 is a vertical section along the line 9-9 the Pig. 8, on a larger scale, being some parts are shown in elevation and in particular the control switch is shown which is used to control the magnitude of the closing movement of the centering device.

Pig. 10 is a partially in elevation cross-section and FIG

Partial elevation view taken along line 10-10 of Fig. 9.

Figure 11 is a horizontal section along the line 11-11 the Pig. 9.

Pig. 12a and 12b together are a schematic representation the hydraulic control for the centering device, Pig. 12b a lower one Extension of the Pig. 12a is.

Pig. 13a and 13b together represent a schematic

Circuit diagram of the control circuit for the centering device dar, where Pig. 13b an extension of the pig. 13a is down.

Pig. Fig. 14 is a plan view of a selector switch used to select the pipe size for which the centering device is to be adjusted.

In Pig. 1 shows a ship 21 floating on water, the water surface being designated by 22. The ship 21 has a substantially amidship

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Platform 23 on which a derrick 24 is erected. Below the platform 23, an opening which is surrounded by a housing 25 is passed through the hull of the ship. This opening is commonly called the "moon hole." designated. A drill string 26, consisting of several lengths of drill rods, is led down through the moonhole to the bottom of the water.In drilling operations carried out from floating vehicles or ships, the drill string 26 extends through the usual surface facilities located on the The sole of the body of water are located and have a safety device or a preventer and the like. A standpipe 10, which surrounds the drill string 26 and forms an opening space 11 for the return of the drilling fluid or the mud, is guided up to the top of the moon hole at the bottom of the body of water. The standpipe 10 is provided with an outlet connection 12 which connects the annular space 11 with (not shown) corresponding containers for the rinsing slurry. As best seen in fig. 2a and 2b, the derrick 24 consists in a known manner of the usual corner posts 27 and 28 which are fastened on base members 29 and 31 on the platform 23. A roller frame 32 at the top of the derrick carries the usual tower roller 33, which is aligned with the vertical center line of the derrick. ^{A so-called "jumping jack 11} 35" hangs on the tower roller through the rope 34. The fixed end of the rope 34 (not shown) is attached to the ship.

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superstructures or the platform "attached and the other end the rope is led to the drum 36 of a drill winch 37, which serves the jumping jack and the one carried by it To raise or lower the load. .

There is a hook 38 on the underside of the jumping jack 35 by, a hanger 39 on the hook and a hanger 41 on the Jumping jack suspended from swivel. On rabbits 43 of the hook elevator members 42, of which only one member is shown in FIGS. 2a and 2b, are pivotably suspended and at the lower ends of the links 42 is through noses 45 a Elevator 44 is pivotably suspended.

The general reference numeral 46 denotes a device for adjusting and guiding the jumping jack and the hook. A device for stabilizing the elevator links according to the invention is denoted by the general reference number 47. The general reference numeral 48 denotes a compressed air supply device for supplying compressed air to the elevator 44 ', whereby the latter is actuated.

The illustrated drill string stand 49 is through a Rod holding device held, which has the adjusting devices 51 and 52. Additional drill rod stands 53 and a heavy pole stand 54 are placed in a frame, which has a rod rake 55, a base plate 56 and a central frame member 57. The top end

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of the drill string 26 is upward ^ over a pair of machine tongs 58, the slips 59 and the turntable 61 in front. One for Working with a casing serving device is generally referred to by the sign. 62 indicated. A probe head and a driver bar 63 "are located within the rat hole 64.

Ton the derrick is below the adjusting device

51 a horizontal stage 65 to the outside, on which an operator can stand, in order to move the adjusting device discontinue or repair. On the adjusting device

52 is a rope 66, which is through a hydraulic Cylinder with piston 67 can be actuated to raise or lower part of the actuating device 52.

The ones for setting and "guiding the jumping jack and the The device used for the hook, as well as the device used to stabilize the elevator links, to which the im As generally indicated above, are shown and described in detail in a U.S. patent application from John ¥. Turner, Jr., File Serial ETo. 687 818 and the title "Stabilized pipe holding device for a derrick". The details of the linkage 55, the middle frame member 57 "as well as the base plate 56, i.e. the adjusting device and its mode of operation form the subject of another U.S. patent application by Moal E. Johnson and John W. Turner, Jr., with

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the file number Serial No, 687 820 and the title ^ Gestängerechen and adjusting device ". The hook 38 and its association with the elevator 44" i.e. the manner in which the elevator the hydraulic drive fluid from the Hook is fed forward to enable remote operation of the elevator 44 forms the subject of an XI.Sv patent application by Edward J. McFadden, file number Serial No. 687 829 entitled "Liquid Delivery Device for an elevator suspended from the hook ". For these reasons, the details of the deep drilling rig are given here only described insofar as it is in terms of structure and the functioning of the jumping jack in connection with the Device for adjusting and guiding the jumping jack and the hook, as well as the device for stabilizing the elevator links is required.

The hook, generally designated 38, consists of a hook body 38a and a hook 38b on which the above-described lugs 43 are located, by means of which the elevator members 42 are held . The hook body 38a is relatively fixed, that is, it is not rotatably arranged, while the hook 38b can be brought into various angular positions from the normal position shown in FIG. 2a during certain work with the linkage. For this purpose, the hook body 38a is provided with a manifold 38c for compressed air, which is supplied by a (not shown)

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Pipeline is supplied and from the manifold 33c guided to elevator 44 by flexible conduit 38d to open it as desired. An embodiment of a compressed air operated elevator is shown in FIG U.S. Patent No. 2,695,189 issued Nov. 23, 1954 to U.S. Patent No. 2,695,189 Inventors Chrisman and NieοIson depicted from which can be seen that such an elevator by compressed air is opened, but closes automatically when a pipe is pushed sideways into the open elevator will.

The adjusting device indicated at 51 and 52 is shown in FIG another U.S. patent application by John ¥. Turner, Jr., with file number Serial No. and the title

"Actuating device for drill rods ¹¹ described and shown and serves to bring the drill rod stand 49 into a central position within the drilling tower 24 and above the turntable 61, in which the drill string 26 is held by the slips 59. Since the ship 21 on the water floats, it is exposed to the waves that cause the ship to pitch and roll, causing the derrick to swing from side to side, the drill string stand 49 being held in a fixed position with respect to the derrick 24 by the actuators 51 and 52. It however, it is desirable to insert the male end 49a at the lower end of the drill string 49 into the socket end 26a at the upper end of the drill string 26, wherein

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the male end and the socket end should be in mutual axial alignment in order to enable the parts to be screwed together. Production takes place on stable platforms these screw connections in terms of mutual Alignment is not a problem with floating platforms such as platform 23, which are located on a floating ship results from the ^ Movement of the ship is a problem related to the drill string 26. Therefore, when the slips 59 reach the top of the drill string 26 firmly connect to the derrick 24, the Drill string 26 flexed each time the ship had a Performs stomping or rolling motion. This bending of the drill string is detrimental, especially during the Drilling operation when the drill string 26 is rotated by the turntable 61. Some designs of floating vessels that carry derrick are therefore with main gimbal inserts or driver inserts, which the slips 59 hold in such a way that drill string 26 is in the position shown in Pig. 3 its vertical way shown Can maintain position while the derrick performs angular movements with respect to a horizontal plane. By the use of such a main gimbal insert, the in Pig. 3 is generally designated with G-, the bending stress of the drill string reduced during a so-called tour and the drive rod during the Drilling process freed from bends. The cardan main

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insert G "consists of a cardan carrier in the form of a Shell 100, which has a hemispherical seat 101 for the cardan link 102 depicts the slips 59 holding. Of the Cardan carrier 100 is through a pin 103 or by a other, suitable gate direction with the / known turntable connected so that it can be rotated through this.

Although such a cardan main inset ζ protects the drill string, it allows the plug end 49a of the drill string stand 49 held by the adjusting devices 51 and 52 at an angle with respect to the Sleeve end 26a is located at the upper end of the drill string 26, and is offset in the lateral direction with respect to this. Therefore, the insertion of the male end 49 into the socket end 26a and the screwing made more difficult if the ship is exposed to the waves «

Therefore, the male end 49a and the socket end 26a of the drill string stand 49 and the drill string 26 are independent To keep them aligned with one another from the pitching and rolling of the ship 21 is below the platform 23 Centering device generally designated C is provided.

The centering device consists of several rod-shaped ! Feed that a four-sided opening 105 between them form through which the drill string 26 is passed. As the i "ig. 3-6 generally show, the four-sided

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Opening 105 through the elongated centering chucks 107, 108, 109 and 110 formed. In the exemplary embodiment shown here, the centering chucks 108 and 110 are located in FIG a plane lying above the centering chucks 107 and 109 and allow movement towards one another the centering chuck in the in Pig. 6 illustrated manner, whereby the drill string 26 between the centering chucks

P is held. To move the putter 107-110 is a Actuating device is provided, which consists of the hydraulic plunger devices 107R, 108R, 109R and 110R, which are each connected to the centering chucks 107-110 by rod-shaped adjusting rods 111, 112, 113 and 114. To feed pressurized hydraulic fluid to the respective pressure piston devices 107R-110R and to the Return of the liquid from these, whereby the centering chucks are moved towards or away from each other, appropriate devices are provided, which are described in the following to be discribed. When the centering chucks 107-110 are moved towards one another in order to clamp a drill rod, the four-sided opening 105 is located below and in axial alignment with the center of the gimbal 100 of the main mission G. Therefore, the position of the top end of the drill string 26 with respect to the platform 35 set, as Fig. 5 shows. Since the position of the drill pipe stand 49 within the derrick 24 is fixed by the adjusting devices 51 and 52, so that the stand

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49 is in axial alignment with the center of the main gimbal insert Gr, therefore, the male end 49a of the drill pipe it stood 49 and the sleeve end 26a of the drill string 26 also axially aligned so that the male end can be inserted into the socket end regardless of the pitching or rolling of the ship, the drill string 26 is bent accordingly below the centering device G in order to compensate for the pitching and rolling. However, bending of the drill string 26 only occurs when the centering device on the drill string is closed i.e. not during the drilling process.

The details of the centering device are clearest in the Pig. 7-11. In particular, the centering device has a storage device Frame 120 which can be fastened in a suitable manner below the platform 23 and from the frame members and 122, which form a central opening 123. This central opening is located below the turntable 61 and allows the drill string 26 to pass through.

The plunger device 107R used to operate the centering chuck 107 consists of a pair of double-acting ones Printing cylinder 124 suitably rigidly attached to mutually spaced support plates 125, which form part of the frame 120. On the pressure cylinders 124 there are control rods 111,

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which are connected at 127 to the ends of the centering chuck 107. The one used to operate the centering chuck 108 Pressure basket device 108R has a pair in a mutual Spaced pressure cylinder 128 with protruding control rods 112, which at 130 with the ends of the Centering chuck 108 are connected. These pressure cylinders 128 are fixed in the manner shown in FIG. 7 with suitable ones

P plates 131 connected, which form part of the frame 120, with the impression cylinder 128 at a right angle to the printing cylinders 124 are located. Like Pig. 8 shows, the printing cylinders 128 are in the vertical direction in FIG a level above the level of the pressure cylinder 124 »with the centering chuck 108 also in a level above of the centering chuck 107 is located. The plunger device 109R used to operate the centering chuck 109 consists of a pair of pressure pistons 132 with adjusting rods 113 »which are connected at 134 to the ends of the centering chuck 109 are. The impression cylinders 132 are fixedly attached to suitable plates 135 which are held by the frame 120 will. The pressure piston device 110R for the centering chuck 110 consists of a pair of pressure cylinders 136, which are mounted on plates 137 which are formed as part of the frame 120. These pressure cylinders 136 have protruding control rods 114 on which at 139 with the ends of the centering chuck 110 are connected. The printing cylinders 136 are in the same plane as the printing cylinders

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128, so that the centering chuck 110 is arranged in the same way as the centering chuck 106 in a plane above the centering chucks 107 and 109. In this way, the centering chucks can be moved towards and away from one another and between them form a four-sided opening for pipes of different diameters. The pressure cylinders of the pressure piston devices 107R-110R can be adjusted in such a way that they move the centering chucks 107-110 towards or away from one another, depending on the different space requirements. 7 and 8, the pressure cylinders 124, 132 and 136 each extend the centering chucks 107, 109, 110, while the pressure cylinders 128 move the centering chuck 108 into a closed position. In the other illustrations all are Druckkolbenvor _r directions 107R-110R in such a manner illustrated as the centering chuck extend 107-110 respectively in engagement with a tube.

As can be seen from the further description, the centering chucks 107 and 108 represent a pair that when fed pressurized fluid extends and retracts in unison to the respective pressure cylinders 124 and 128 can be. In the same way, the centering chucks 109 and 110 form a pair of centering chucks, which by feeding a pressurized fluid to pressure cylinder 132 or 136 can be operated.

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To limit the b «w towards one another. Movement of the corresponding pairs of centering chucks away from one another is seen as one goal. This limits the displacement of the centering chucks directed towards one another into a position in which the opening between the two chucks has a certain size. At the same time the shifting of the centering chucks away from one another is limited in such a way that the chucks are brought into a uniform starting position from which they can then be brought into engagement with the drill string 26 anew. The device used to set the position consists of an adjustment controller for J f

des, pair of centering chucks assigned to one another and these setting controllers are each designated with PC1 and PC2. The adjustment controller PC1 is used to control the extension and retraction of the centering chucks 107 and 108 by the pressure piston devices 107R and 108B ₉ while the adjustment controller PC2 is used to control the extension and retraction of the centering chucks 109 and 110 through the pressure piston devices 109R and 11OR.

One execution example of a setting controller is in the Yig. 9-11. This SiafceZlregle * 101 includes a housing 140, which consists of dta Oehattseabschnitteji 141 and 142, d * i aa ** m auBeren Ilaaeea 143 ei "· * l * i" he · are fixed 144th The naneeh 143 is tlfEMt «» Yor-

{■

directions wi · toiapielsweiae Bolienöffnu | igen 145 provided, by which it can be rigidly connected to the frame 120 at a suitable point. Inside the housing UO there is a shaft 146 which protrudes into the housing section 141 and within the same carries a spool 147 on which a rope 148 is wound. The rope 143 is passed through a suitable gland packing 149 (Pig. 10) which prevents foreign bodies from entering the housing. The outer end of the rope 148 is connected to the centering chuck 107 by an eyelet 150. Inside the gellouse section I42 of the setting regulator PCt there is a spring device 151 serving for rewinding, by means of which the shaft I46 is normally rotated so that the spool 147 ^{winds the 1} SeU 143 and the rope 143 is pulled into the housing. A switch arm I53 for operating switches is fastened to the shaft I46 in a suitable manner. The switching arm 153 is angularly rotated with respect to the axis of the shaft 146 by an amount which is proportional to the extension distance of the centering chuck 107 through the pressure piston device 107R. At a distance from the carrier 144, by means of suitable spacers 154, a switch carrier plate 155 is attached, on which several limit switches are arranged, which are designated LS1 to LS 10, as shown in FIG. 11 shows. These limit switches LS1 to LS10 can be conventional microswitches that can be operated one after the other by switching elements I56,

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χ J: / OpIQiNALINSPECTED

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which calibrate in mutual badial distances on the counter 153 are located and successively brought into positions in which they are when the shaft 146 rotates against the Clockwise in the representation of the pig. 11 operate the limit switches LS1 to LS9 one after the other, with one switching element 156 is used to set the limit switch LS1O in the event of a Rotation of shaft I46 clockwise in the illustration of Fig. 11 to operate.

As can be seen in detail from the following, the limit switch LSI is used to set the extended position to limit the centering chuck 107 and 108 to one position, which forms two sides of the four-sided opening for receiving the largest diameter drill string for which the centering device is to be used. In a corresponding way, the limit switch LS9 is used to inward displacement of the centering chucks 107 and 108 to limit positions in which these two sides the four-sided opening for a drill string with the smallest Form the diameter for which the device is to be used. . '

The above description of the setting controller PC1 at the same time also discloses the details of the second adjustment regulator PC2, which is used to adjust the inwardly directed To limit displacement of the other pair of centering chucks 109 and 110, which the other two sides of the four-sided

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The opening for receiving the drill string 8 is formed. In addition, the setting controller PC2 is in a corresponding manner like the setting regulator PG1, for example, nine limit switches, which are used to extend the centering chucks in different directions from the diameter of the drill string To limit dependent positions, and a tenth limit switch, which limits the resetting of the centering chucks 109 and 1iO.

For the simultaneous extension of the centering chucks 107 to 110 by means of the corresponding pressure piston devices 107R to 110R by supplying equal volumes of hydraulic fluid under pressure to the respective ones A corresponding device is provided for printing cylinders 124, 128, 132 and 136.

That in fig. 12a illustrated hydraulic system is used for actuating the pressure cylinders 124 and 128 of the pressure piston devices 107R and 108B. and has a pump P1, whose Inlet is connected to a suitable torrate container for hydraulic fluid. A pipe 160 leads from the pump P1 to an electromagnetic valve ST-1. Bit valve SV-1 has a return outlet 161, which is on the torrate container returns. In addition, the valve SV-1 is connected to a pipeline 162 which leads to a "distributor 163 for airflow, which is connected via an adapter 164" to a direct distributor t # 5 mm * ore "iac svtitt AJWleJltitua" 166

inspected-.

is in communication with a third manifold 167. From the second distributor 165, the pipes 168 and lead 169 to the printing cylinders 128. From the third manifold 167 lead the pipes 170 and 171 to the pressure cylinders 124. In this way, the pressure piston devices 107R and 108R pressurized fluid are fed, the centering chucks 107 and 108 being fed through the feed

ψ drove equal volumes of liquid to the corresponding pressure cylinders 124 and 128 are shifted equal distances and press the pressure cylinders 124 and 128 on the ends of the respective centering chucks 107 and 108, and move them in such a way that they are in engagement with the drill string 26 come. When the valve SV-1 is operated to retract or retract the centering chucks 107 and 108, the liquid from the pump P1 is fed to the other ends of the respective pressure cylinders 124 and

. 128 is fed through a conduit 172 which is carried by branch lines is in communication with the printing cylinders. In these circumstances, manifolds 167, 165 and 163 act as Manifolds and allow the uniform discharge of liquid from the respective pressure cylinders through the outlet pipe 161 of valve SV-1.

To actuate the cylinders 132 and 136 and provide displacement of the centering chucks 109 and 110 is a «wide Pump P2 is provided, its binle with the storage tank

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and the outlet line 260 of which is connected to a solenoid valve SV-2. The solenoid valve SV-2 has in in a manner corresponding to that of the solenoid valve SV-1, a return outlet 261 which leads back to the reservoir. In addition, the valve SV-2 is connected by a conduit 262 to a first manifold 265, which in turn through an outlet line 264 to a second manifold 265 and through a second conduit 266 is connected to a further distributor 267. Pipes 268 and 269 lead from the distributor 265 to the pressure cylinders 152. From the distributor 267, the pipes 270 and 271 lead to the pressure cylinders 156. Therefore, under Hydraulic fluid under pressure den. corresponding plunger devices 109R and 11 OR are unguided, around the centrifuges 109 and 110 by feeding the same Liquid volumes to the pressure cylinders 152 and shift by equal distances. The printing cylinder and 156 act on the ends of the centering chuck 109 and a and move them in a direction that they in engage a drill string 26. When the solenoid valve SV-2 is operated, the centering chuck 109 and 110 to retract or withdraw, the liquid supplied by the pump P2 becomes the other Ends of the respective pressure cylinders 152 and 156 are fed through a pipe 272, which is connected via branch lines to the pressure cylinders 132 and 156, respectively <

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stands. During the retraction of the centering chucks 109 and 110, the distributors 263, 265 and 267 act as collecting pipes and allow liquid to be evenly dispensed from the respective pressure cylinders through the outlet conduit 261 of valve SV-2.

As explained in detail below, can each solenoid valve SV-1 and SV-2 depending

* be brought into the two positions described above by the excitation of an electromagnet A on the one hand or the excitation of an electromagnet B on the other hand. Thereby, the corresponding valves SV-1 and are set SV-2 so as to supply hydraulic fluid pressure piston devices 107R-110R or liquid bleed from these, wherein the solenoid valves SV-1 and SV-2 standard, do not have an excited state, in which the liquid only from the

) Pumps P1 and P2 through inlet and outlet lines 160, 161 and 260, 261 of the valves is circulated. In particular In both solenoid valves SV-1 and SV-2, solenoid A is energized when the centering chuck closes 107-110 is initiated around the drill string, while both solenoid valves use the solenoid B is energized when the centering chucks 107-110 are in positions which are set by the setting controllers PC1 and PC2 are. - *

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If, however, the ship 21 stomps or wobbles very large moves while the centering chuck 107-110 are closed around the drill string or any pair of centering chucks engages the drill string 26 and this therefore bends, it is desirable that the hydraulic pressure by which the centering chuck in a Are brought into engagement with the drill string, is removed to avoid damage to the drill string. For this purpose, the hydraulic system shown in Fig. 12b has an overpressure control unit with a main overpressure valve 300, which is normally kept closed by gate pressure. The final 301 of the Pressure relief valve is connected to a pipe 302 which leads to a plurality of one-way ball valves 303, 304, 305 to the like 306 leads. The one-way ball valve 303 is in communication with the pipe 166 through a pipe 307, which the manifold 163 connects to the manifold 167 and the pressure cylinders 124 fluid under pressure feeds. The one-way valve 304 communicates with the conduit 164, which is the manifold, via a conduit 308 163 connects to the distributor 165, which in turn supplies the pressure cylinders 128 with liquid. If therefore one of the centering chucks 107 or 108 is subjected to a force by the drill string 26, with which the! chucks 107 and 108 exert a counterforce, or if the force that is needed to turn the centering chuck in one

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To maintain engagement with the drill string 26 is sufficient to Bending over the drill string 26 becomes the main relief valve opened and pressurized fluid through the one-way valve 305 or through the one-way valve 304 to an outlet line 309 which is the main pressure relief valve 300 connects to the reservoir.

The one-way valves 305 and 306 are in communication between the W main pressure relief valve 300 and the manifolds which supply fluid to the pressure cylinders 132 and 136. The one-way valve 305 is connected via a pipeline 310 to the pipeline 264, which connects the distributor 263 to the distributor 265, from which liquid is supplied to the two pressure cylinders 132. The one-way valve 306 is connected via a pipe to the pipe 266, which connects the manifold 263 to the manifold 267, from which fluid is delivered to the other pressure cylinders 136. if

therefore one of the centering chucks Ί09 or 110 is sufficient is subjected to high force, which causes the opening of the main pressure relief valve 300, fluid flows from the manifold 263 or from the manifold 267 through either the One-way valve 305 or through one-way valve 306 to positive pressure outlet line 309.

Since the from the centering chucks 107-ti 0 on the drill string or pipe string 26 maximum holding force exerted by the pipe

- 29 -

. 9098 8 4/039 2 _r; ; -

ORIGINAL INSPECTED

Strand is dependent, i.e. it is related to the size of the between the drill string or casing being held in the chuck, a selective pilot control device is provided to do this serves to expose the main pressure relief valve 300 to different pilot pressures. In the version shown here a pair of solenoid valves SV-5 and SV-6 are used to to the pressure relief valve controlled by the pilot pressure 300 applied pressure by means of a pilot control line 315 by changing the connection between the main pressure relief valve 300 and one of several pilot control pressure relief valves 316 and 317 controlled by solenoid valve SV-5 and one of several pilot relief valves 318 and 319t those by the solenoid valve SV-6 can be controlled, optionally set. Each of these pilot relief valves 316, 317 and 318, 319 can open through a certain counter pressure that is applied via the pipeline 315 from the main pressure relief valve 300 to the pilot control pressure relief valve. thats why the pilot relief valve 316 then with that to the main relief valve 300 leading pipe 315 is connected when the solenoid A of the solenoid valve SV-5 is energized is, while the pilot pressure relief valve 317 then is connected to the pipe 315 leading to the main pressure relief valve when the solenoid B of the solenoid valve SV-5 is energized. In a corresponding manner, the solenoid A of the solenoid valve is excited

;:, 109814 / Ö392

SV-6 a connection between the pilot control Uberdruckyenljl 313 and the pipeline leading to the main pressure relief valve 315, as well as an excitation of the electromagnet B of the solenoid valve SV-6 a connection between the pilot control pressure relief valve 319 and the pipe 315 of the main pressure relief valve 300. A pilot control pressure line 320 connects all pilot control pressure relief valves 316-319 with the pipe ^ line 309 and the storage container.

As will be explained below, the solenoids A and B of the two solenoid valves SV-5 and SV-6 optionally energized when the system is actuated to a To center the length of a drill pipe or casing by means of the centering piston device.

Because from time to time certain fluctuations in the distribution hydraulic! fluid can occur through the various fluid distributors described above, * so that the centering chucks 107-110 are not operated synchronously are, a reset device is provided through which the centering chucks 107-110 by means of the corresponding Plunger devices 107R-110R above their normal retracted or retracted position can be retracted into a position that is used as a stowage position, i.e. can be referred to as the most retracted position 107R-110E adjusted in such a way that the center

• - - 31 -

909884/0392

Trierfutter 107-110 then synchronously towards each other can be extended.

This reset device is in Pig. 12b shown and has a solenoid valve SV-3 and another Solenoid valve SV-4, each through the pipes 321 fczw. 322 with the outlet lines 172 and connected to the respective pressure cylinders 124, 128 and 132, 136 via the solenoid valves SV-1 and connect the ST-2 to the storage tank. In addition, the reset device has the bypass lines 323 and 324 on. The pipe 323 is connected to the pipes 16 and 169, through which the in the pressure cylinders 128 located liquid is vented during retraction of the centering chuck 108, while the pipe 324 is connected to the pipes 170 and 171, through which the liquid from the pressure cylinders 124 is vented during the retraction of the centering chuck 107. In the pipe 323 is a through the Pilot pressure controlled and normally closed valve 325, while in the pipe 324 through pilot pressure controlled, normally closed Valve 326 is located. The reset device has a pipe 327, which with the outlet lines 270 and 2J1 is connected through which the liquid during the retraction of the centering chuck 110 from the pressure cylinder

- 32 909884/0392

1931247

the 136 is dispensed, and another pipe 328 is connected to the pipelines 268 and 269, through which the liquid is discharged from the pressure cylinders 132 during the retraction of the centering chuck 109. In the pipe 327 is a normally closed valve 329 controlled by the pilot pressure, while in the pipe 328 there is a normally closed valve controlled by the gate control pressure 330 is located. The valves 325, 326 and 329, 330 «it to the. Gate storage container are connected. The gate control pressure is fed to the valves 325, 326 and 329, 330 controlled by the gate control pressure through a pilot pressure line 332, which receives liquid through a pipe 323, when the solenoid valves SY-3 and ST-4 are open and the solenoids B of the solenoid valve ST-1 and ST-2 are excited to initiate the retraction of the centering chuck. However, if the first of the centrifugal chucks 107-110, the should be fully retracted, is prevented from further displacement in E in the direction of travel, the pressure decreases in the pressure cylinders of the pressure piston devices for the centering chuck in question and thereby causes a Increase in pressure in one of the lines 321, 322 and this increased pressure is supplied to the corresponding valves 325, 326 and 329, 330 controlled by the pilot pressure. As a result of this pressure, the last-named valves open

- 33 -909884/0392

tile and allow the liquid from all the rest Pressure piston cylinders on manifolds 165, 167 and 265, • Pass 267 in the bypass flow and flow back through the opened valves 325, 326 or 329, 330 to the storage container can «When all pressure piston cylinders have fully retracted all centering chucks 107-110, take the pressure in the pipes 321, 322 continues to increase and causes the actuation of a pressure switch 334, the task of which will be described in detail later and the associated one is used to switch off the solenoid valves SV-3 and SV-4 and to put the reset device inoperative. the Centering chucks 107-110 are therefore reset following actuation of the reset device, so that they are all at a common starting point, i.e. at the end of their entry stroke. Therefore, when the printing cylinder ram assemblies 107R-110R extended again the centering chucks 107-110 move synchronously with one another.

A control circuit is schematically shown in FIGS. 13a and 13b illustrated, by which the hydraulic systems described are controlled so that they the centering piston devices and operate the centering chucks in the manner described above. This control circuit has a voltage source which is switched on or off by a main switch 400 (FIG. 13a) a motor M1 and a motor M2 for driving the pumps P1 and

90S884./0391 - 34 -

P2 and can be switched by an on-off switch 401; » be switched. In the motor circuit there is a normally open relay contact 403a, which when energized a relay coil 403 can be closed, which in a circuit with a switch 404 to

/ is located.

Extending or closing the pressure pistons / There is also a signal lamp 405 in the motor circuit, which

* should be colored white and indicates that the motor circuit is closed and therefore the plunger can be extended or closed when the switch 404 is extended the plunger is actuated. The relay coil 403 is located after the closing of the switch 404 in a holding circuit 405 ·, which has a further, normally open relay contact 403b, so that when closing of the switch 404 of the solenoid A of the two solenoid valves SV-1 and SV-2 are energized and connect between the pumps P1 and P2 the pressure cylinder for the

' Manufactures Plunger Devices 107R-110R. If desired, the circuit used to close or retract the pressure pistons can also have an emergency switch 404 ″ for retracting or closing the pressure pistons in a circuit which bypasses the holding relay 403. A signal lamp 408 can be provided in the circuit used to retract the pressure pistons, which lights up when the pressure piston devices 107R-110R retract the centering chucks 107-110 and are closed around the drill string 26.

909884/0392

keep sen. In series with the signal lamp 408 are therefore normally open relay contacts 411a and 412a, the then be closed and the signal lamp 408 lights up bring when the relay coils 411 and 412 are respectively energized by the aforementioned adjustment controls PC1 and PC2 are. They are relay contacts 411a and 412a in the embodiment shown in a setting control circuit, which has lines 413 and 414, which respectively a voltage line with the relay coil 411 resp. tie the relay coil 412. Pie relay coil 411 is open one side with the limit switches LS1 to LS9 of the Setting controller PC1, while the relay coil 412 on one side with the limit switches LS1 to LS9 of the setting controller P02 is connected. Each one its limit switch LS1 to LS9 of the two adjustment knobs PC1 and PC2 is a normally open switch and a single limit switch at a time can be controlled by a suitable selector switch generally designated SS placed in circuit with relay coils 411 and 412 will.

In the embodiment shown here, the selector switch SS has ten selector positions, each with S1-S10 are designated. A rotatable switch arm 415 is used to select one of the limit switches LS1-LS9 of the two To connect setting controllers PC1 and PC2 in parallel. If therefore

- 36 90 9 88 4/0392

the tube located between the centering chucks 107-1 .0 26 has the largest diameter for which the centering device is designed, the rotatable switch arm 415 comes into contact with the contact S1 of the selector switch brought so that each limit switch LS1 of the two Adjustment regulators PC1 and PC2 are connected in series with the relay coil 411 and the relay coil 412, respectively both relays each normally closed contact sets 411c or 412c, which are in series with the Electromagnet A of the El & bromagnetic valves SV-1 and SY-2 are switched. Rotation of the switch arm 153 (3? Ig · 11) of the adjustment knobs counterclockwise causes a Operation of the microswitch shown in FIG. 11 or limit switch LS1 by one of the switching elements 156. Therefore the limit switch LS1 is the corresponding one Setting controller PC1 or PC2 closed when the centering chucks 107, 108 and the centering chucks 109, 110 have reached the centering position for the pipe, the switching arm 153 being rotated by the flexible cable I48. Closing the limit switch LS1 of the setting controller PC1 causes the relay coil 4I1 to be excited, which a normally closed relay contact 411b is opened, which is in a slavic circle with the holding coil 403 of the circuit used to extend the pressure piston is located, and at the same time a second, normally closed relay contact 411c is opened, the

. . - 37 909884/0 39 2

the solenoid A of the solenoid valve SV-1 is de-energized power. This neutralizes the last-mentioned solenoid valve and the closing movement of the centering chuck 107 i ^ nd 108 brought to a halt.

If in a corresponding manner the limit switch LS1 of the setting controller PC2 is closed when the centering chuck 109 and 110 reach the position in which its closing movement is to be brought to a halt, the relay coil 412 is energized, whereby a first, normally closed relay contact 412b, which is parallel to the contact 411b and connected to the holding relay coil 403 is, open, and a second, normally closed relay contact 412c in parallel with the contact. 411c is and in series with the solenoid A of the solenoid valve SV-2 is switched open. When the two normally closed contacts 411b and 412b are opened depending on the excitation of the two relay coils 411 and 412, the circuit becomes the Äalterelaisspule 403 open. As you can see now then also the two solenoid valves SV-1 and S7-2 are neutralized and the centering chucks 107-110 are in the desired division of engagement with a pipe held until either a switch 416 to retract or open the pressure piston (Pig. 13b) is closed or the tube 26 as a result of the movement of the ship is subjected to such a high bending force that the above

909984 / 0392- - 38 -

The overpressure system described comes into effect and the movement of a centering chuck 107-110 in one direction allows, in which the tube 26 is relieved of the bending forces.

If the pressure pistons are to be retracted or the centering chucks 107-110 are to be moved away from one another, the circuit used to retract the pressure piston is excited by closing the aforementioned switch 416, which excites the holding coil of a relay 417. By energizing the relay 417, the normally open relay contacts 4i7a are closed and the current kr eis serving to retract the pressure piston is energized. As a result, the electr omagne te B of the two solenoid valves SV-1 and SV-2 are energized and bring these valves to a position in which the supply of hydraulic fluid to the pressure cylinders of the pressure piston devices 107R-110R is reversed, so that the centering chucks 107-110 retracted or withdrawn. In a circuit with the holding relay coil 417 there are normally closed contacts 419a and 420a of a pair of relays 419 and 420, which are normally de-energized, but are each JLn in a circuit with the limit switches LS10 of the setting controllers PC1 and PG2. In the price of electricity to the electromagnet B of the two electromagnetic valves SV-1 waä there are further normally closed contacts'

909884 / Q392

and 420 b, which can also be opened as a function of the excitation of the relay coils 419 and 420 "when the corresponding limit switch LS10 is closed. Therefore, if the limit switch LS10 of a setting controller PCI or PC2" during a movement of the switching arm (FIG. 11) during the retraction of the centering chuck 107, 10ö "or 109, 110 is closed, one of the relay coils 419 or 420 is excited and opens one of the contacts 419a or 420a, as well as one of the contacts 419" b or 420b. If the other limit switch LS10 is closed, the other of the contacts 419a, 420a and 419b, 420b is opened when the other of the two relays 419, 420 is energized, whereby the circuit to the holding relay coil 417 and the circuit to the electromagnet B of the solenoid valves SV-1 and SV-2 is interrupted. The solenoid valves SV-1 and SV-2 are therefore neutralized and limit the retraction of the centering chucks 107-110 to positions which are determined by the limit switch LS10, so that the centering chucks are not fully retracted. The indication that the plungers are in the retracted or open position can be indicated by a signal lamp 422a ¹ for the retracted position of the plunger, which is in series with normally open contacts 419c and 420c, which are activated when the relay controlled by the limit switch is energized 4I9 and 420 are closed.

- 40 909884/0392

If, however, one of the centering chucks 107-110 before Close switch 416 to retract the plunger to avoid damaging the tube with the Tube 26 is moved together, which is made possible by the above-described overpressure control unit set the pressure relief by appropriate setting of the selector switch SS (Fig. 13a) so that it ) adapted to the different pipe sizes within the opening formed by the centering chuck 107-110 is. For this purpose, the selector switch SS has a second set of switching contacts, each with S11 bis S20 are designated, as well as a further, rotatable switching arm 415a, which is optionally in contact with one of the contacts S11-S20 can be brought. Although different Combinations are conceivable, some of the contacts S11-S20 with the electromagnet are in the embodiment shown here A of the solenoid valve SV-5 »other contacts with the solenoid B of the solenoid valve SV-5» again other contacts with the solenoid A of the solenoid valve SV-6 and finally other contacts connected to the solenoid B of the solenoid valve SV-6. Therefore, depending on the setting of the selector switch SS, one of the electromagnets A or B becomes one of the Solenoid valves SV-5 and SV-6 energize and establish a connection between them in the manner already described one of the pilot pressure relief valves 316-319 and the pre

90988 A / 0392 - 41 -

control line 315. Therefore, the pressure at which one of the pressure piston devices 107R-HuR through the main pressure relief valve to the reservoir vented wi ^ d, specified by the setting of the selector switch SS.

When the liquid has been dispensed from one of the centering piston devices or when the positions of the centering chucks 107-110 are to be synchronized at any point in time, the reset device already described is actuated to retract or retract the centering chucks 107-110 beyond their reset position the limit switch LS10 is specified in the setting controllers PCM and P02. For this purpose, the circuit has a "jam switch" 421 (Pig. 13b), which. In the closed position, a holding relay coil 422 through the normally closed contact set 334a, whereby the normally open contacts 422a are closed in a holding circuit through which the solenoids of solenoid valves SV-3 and SV-4 are energized. Relay coil 422 continues to close normally open contacts 422b and energize solenoids B of solenoid valves SV-1 and SV-2 through a circuit parallel to the piston retraction circuit . By energizing the relay coil 422, the normal-

- 42 90988W0332

wise opened contacts 422c (I? ig. 13a) opened by, which the contacts S11-S20 of the selector switch in a circuit with the electromagnets A and B of the solenoid valves SV-5 and SV-6 can be switched.

Therefore, when both solenoid valves SV-3 and SV-4 (Pig. 13b) are open, the gate pressure is through the pilot pressure line 332 is supplied so that then, when one of the centering chucks 107-110 is in the fully retracted position, one of the pilot pressure controlled valves 325 »326 and 329, 330 is opened and a vent from the other of the pressure cylinder of the plunger devices 107B.-110B. allowed until all centering chucks 107-110 are fully retracted. In At this point in time, the pressure in the pilot control line 333 increases and causes the pressure switch 334 to be actuated (Pig. I2b), whereby the normally closed contacts 334a interrupt the circuit to the holding relay coil 422, so that the latter is de-energized and the normally open relay contacts 422a open can, which in turn causes the electromagnets of the solenoid valves SV-3 and SV-4 de-energized and the pilot pressure line 322 is blocked, so that the through the im By-pass supplied pilot pressure controlled valves 325, 326 and 329, 330 are put out of action.

- 43 909884/0392

When the jam holder 421 is initially closed and the holding relay coil 422 is energized, a set of relay contacts 422d is opened, while by energizing the relay coil 4I7 to retract the plungers when the switch 416 to retract the plunger closes a set of normally open contacts 417b is opened, thereby breaking an overpressure warning circuit which includes a relay 42d which serves to close one set of normally open contacts 428a when the aforementioned pressure switch 334 closes another set of contacts 334b that is in circuit with the relay coil 42d are located. This will illuminate an overpressure warning lamp 430, which may be red in color, indicating that one of the. Centering chuck 107-110 is moved as a function of a force exerted on the tube 26 in order to relieve the tube of a bending stress. By energization of the solenoid valves SY-1 and SV-2 (Fig. 13a) and an extension of the centering chuck 107-110 by closing the switch 404 to prevent retraction of the pressure piston or of the emergency switch 404 ¹ are connected between the voltage source and the electromagnet A of the two solenoid valves SV-1 and SV-2 normally closed contacts 428b are provided, which are opened when the relay 428 for overpressure warning is energized. The relay 428 is at

- 44 909884/0392

actuation of the pressure switch 334 to close the contact set 334b during the dispensing of liquid the hydraulic system used to extend the pressure pistons is excited.

If desired, an emergency circuit can also be provided, which has an "Ifotf all traffic jam switch" 421a, which bypasses the normally open contacts 422b, "controlled by the heater 422, which in turn controlled by the jam switch.

The one in Pig. 14 generally shown selector switch SS has ten settings for the rotatable switch arm 415 »die with corresponding information for different pipe sizes or different pipe types such as drill rods, drill collar and liner, which in the present Description are all referred to as tubes, since they are tubular structures and in the above-described " nen way by the actuators 51 and 52 in a can be hung above the upper end of a pipe string held in the main gimbal insert G-. This here selector switch shown has ten selection positions for ten different pipe sizes, two of which are switch positions correspond to corresponding pipe sizes, namely a casing pipe 5 inches (12.7 cm) in diameter and a 5 inch (12.7 cm) diameter boring bar. Therefore, the contacts S5 and S9 of the selector switch SS are in

- 45 -9Q988A / 0392

the schematic diagram of Fig. 13a both with the same limit clialter 1S7 connected as the individual Limitation holder in both cases serves to reduce the closing movement of the centering chuck. the boring bar or to limit the casing around.

When using the device described above, for example when introducing a drill string into an already drilled borehole, the drill string 26 is held in the main gimbal insert G in the manner shown in FIG to permit angular movement of the derrick 24 with respect to the drill string 26 when the ship 21 is pitching or rolling. The Bohrgestängestand 49 'having the plug-in end 49a at its lower end, is held by the detents 51 and 52 in the embodiment shown in FIG _e 2a and 2b, in a position in which he in the ideal case in the axial direction with the gimbal main insert 6 - is aligned so that the male end 49a can be inserted into the socket end 26a of the drill string 26 which is held by the main bit. When the ship moves as a result of the wave movement and an angular displacement occurs as shown in FIG

- 46 90988 4/039 2.

also switched on. If now the switch 404 to Ausfabren the pressure piston is actuated, the centering chucks 107-110 are extended and shown in FIG V / else brought into engagement with the drill string 26. As already described, the setting controls limit PC1 and PC2 the movement of the centering chucks towards each other, so that the four-sided Opening surrounds the drill string 26 in the manner shown in FIG. 6. When the centering chuck is around the pipe string close around, the top of the drill string 26 and the main gimbal & will become coaxial with the drill string 49 aligned, which is held by the actuators within the derrick. Under these circumstances the movement of the ship is transmitted to the drill string 26 located below the centering device C.

When the movements of the ship are of such magnitude that there is a risk of damage to the drill string 26 arises as a result of the bending moments exerted, the above-described overpressure control unit comes into operation and allows the retraction or retraction of the centering chuck which is too heavily loaded, thereby causing the deflection of the drill string 26 is reduced.

As a result of the reduction in the bending of the drill string by releasing the ones used to extend the pressure pistons Liquid is the position of the pressure

- 47 90988A / 0392

made centering chucks inconsistent and the one already described The reset device can be actuated by closing the jam switch 421, whereby all centering chucks are retracted as far as possible. In this Position, the centering chucks are retracted or withdrawn further than when the switch 416 to the Retraction of the pressure piston. Therefore, when the switch 404 is closed again to extend the plunger to the Bringing centering chucks into engagement with the drill string 26, the centering chucks are in similar Starting positions and move synchronously into a centering engagement with the drill string 26, being controlled by the adjustment controls PC1 and PC2. The reset device can also be operated periodically to prevent any irregular setting of the Centering chucks 107-110 to eliminate that caused by an uneven distribution of the hydraulic fluid the pressure cylinders of the hydraulic pressure piston devices 107R-110R.

When the drill string 26 passes through the underneath the Zardan main insert G centering device C has been centered, the pipe length 49 can be in the drill string insert and the machine tongs 58 can be used to rotate the Pipe length 49 can be used to screw this to the drill string 26. Then switch 416 becomes retracted

- 48 909 88 4/0392

■ - 48 -

the pressure piston "actuated, whereby the centering chucks are retracted or retracted so that the now elongated drill string 26 can be lowered into the borehole by the jumping jack 35 and the hook 38 ^ hanging on the rope 34. These operations can be repeated as often until the drill string and in particular a drill bit (not shown) at the lower end of the drill string has reached the bottom of the borehole
and drive rod 63 connected to the drill string 26 and lowered into the main gimbal G so that the
Drill string is caused to rotate by rotating the turntable 61. The cardan main insert then allows an angular position of the drive rod with respect to the turntable axis, whereby the drill pipe during drilling of the
Borehole is relieved of bends.

** "The invention is not intended to cover the details of here illustrated and described embodiment, but also all falling within the scope of the invention include further technical refinements.

909884 / D3 9-2

- Patent claims: -

- 49 -

Claims (7)

Patent claims: 1. Deep drilling device consisting of the combination of a on a ship floating in water, on which there is a turntable with a cardan main insert for mounting the upper end of a pipe hanging from the ship down into the water and for holding a length of pipe in the derrick of the deep drilling device and for connecting the pipe length to the upper end of the pipe string serving devices, characterized in that a centering device (C) is provided, which in a Can be brought into engagement with the pipe string (26) and serves to connect the upper end of the pipe string (26) with the Keep pipe length (49) axially aligned. 2. Deep drilling device according to claim 1, characterized in that that the centering device (C) is arranged below the turntable (61) 3. Deep drilling device according to claim 1, characterized in that that the centering device (C) has several centering chucks (107-110) stretched in the horizontal direction, which form a multi-sided opening (105) through which the upper end of the pipe string (26) is passed, and Devices (107R-110R) which serve to the centering chuck (107-110) to each other, as well as from each other to move away and into or out of engagement with 9 098 8 4/0392 -50- the upper end of the pipe string located between the chucks (26) to bring about an angular movement of the ship (21) with respect to the upper end of the pipe string (26) to prevent or enable. 4. Deep drilling device according to claim 1, characterized in that that the centering device (C) has several centering chucks (107-110) stretched in the horizontal direction, which form a multi-sided opening (105) through which the upper end of the pipe string (26) is passed, devices (1ü7R-11üR), which are used to move the centering chucks (107-110) towards each other in order to reach the upper end of the Hold pipe string (26) between the chucks, and one Relief Vorlichtung (300), which is used to retract a chuck (107-110) with respect to the other To allow lining (107-110) when the upper end of the tubing string (26) exerts a force of predetermined magnitude on this one Lining (107-110) exercises. 5. Deep drilling device according to claim 1, characterized in that that the centering device (C) has several centering chucks (107-110) stretched in the horizontal direction, which form a multi-sided opening (105) through which the upper end of the pipe string (26) h i τι is passed, devices (107R-110R), which serve to move the centering chucks (107-110) towards each other in order to reach the upper end of the Hold the pipe string (26) between the chucks, a relief device ($ 00), which serves to prevent the retraction 909884/0392 - 51 - 19332Λ7 one liner (107-110) with respect to the other liners (107-110) when the upper end of the tubing string (26) exerts a force of a predetermined magnitude on this one chuck (107-110) and has devices (SV-3, SV-4), which serve to hold the one chuck (107-110) after it has been retracted at an even distance from the other chucks (107-110). 6. Deep drilling device according to claim 1, characterized in that that the centering device (0) has several elongated centering chucks (107-110), one of which is multi-sided Form Port (105), Plunger Devices (107R-110R) for extending and retracting the centering chuck (107-110) and setting controls (PC1-PC2), di «. serve that Extending the chuck adjustable to limit pipes of different sizes. 7. Deep drilling device according to claim 1, characterized in that that the centering device (G) has several elongated centering chucks (107-110) which have a four-sided Limit opening (105), plunger assemblies (1Q7R-110R) for extending and retracting the centering chuck (107-110), each consisting of a pair of pressure pistons (124, 124; 128, 128; 132, 132; 136, 136), each with the ends each centering chuck (107-110) are connected, and devices (167, 165, 265, 267) which serve to the Pressure piston pairs each supply the same volumes of pressurized hydraulic fluid and these extend synchronously. Q0QR8Zi / 0392 ORIGINAL INSPECTED Blank page