DE2926141A1 - DEVICE FOR INSERTING A GUIDE COLUMN IN THE BOTTOM - Google Patents

Description

VOS Boormaatschappij "Foxdrill.BV." ,. Qldenzaal, the Netherlands and Techo-Adv. Bureau Praxis BV, IJmuiden, the Netherlands

Device for introducing a guide column in the bottom.

The present invention relates to a device for introducing a guide column into the bottom when drilling a gel or Gas probe, especially for use on the coast, provided with a tower for holding and lowering the lead column and the drill rod, so / ie also with a turntable for introducing the drill string, with means for temporarily holding the lowered guide column being present and with the turntable is slidable in a frame between an effective position centric to the axis of the probe to be drilled and a lateral, ineffective position.

There are devices of this type known, the displacement of the turntable in the lateral inoperative position is used to large pieces, like excavation slide to let pass to the finished drilled probe.

The invention has set itself the task of improving a device of this type in such a way that it is particularly suitable for Carrying out a method whereby, in order to introduce the guide column, alternating (pre) drilling and ramming have to be carried out.

According to the invention, this object is achieved in that in the turntable frame Means are provided which are displaceable between a

0300 6 2/0337

ORIGINAL fKJSPECTED

ineffective position outside the orbit of the lead column and an effective one Location ,, these means being designed in such a way that they are effective in the Position just below the level of the turntable and when the latter is in its inoperative position, suitable for holding a drill pipe

With the device according to the invention, after using of the turntable in the effective position a pilot hole has been carried out, the relevant drill pipe in the lead column hanging down by the laterally displaceable means under the turntable be gripped so that the linkage can be released from the turntable and the turntable can be pushed into its inoperative position, in which position there is enough space to let the ram block pass Drill rods can then move further into the ground at the bottom of the ramming guide column to be attached intermediate piece, after which the lead column, with the drill pipe hanging in it, can be rammed further into the ground.

In a preferred embodiment, the tower is through a

Column formed which is eccentric with respect to the axis of the effective turntable position is arranged, has at least one Hebeano and with vertical Guide means for a ramming device is provided, the guide means and the ramming device being pivotable between an inoperative position and an effective position in which the latter is the axis of the pile driver coincides with the axis of the effective turntable position.

The invention is below with reference to the drawing with a Embodiment explained in more detail.

030082/0337

-Z-

Figure 1 shows a perspective view of the inventive Device, and

2A-2H show the device according to the invention in several successive positions when driving a series of leading columns in the ground under water.

The device shown in the drawing consists of a portal-like carriage 1 which can be moved in the direction of arrow I on a Bridge 2 is provided, which bridge extends in the transverse direction of a row of holes to be drilled. Bridge 2 carries two thick mud tanks and has two rails 4 on which the carriage 1 is movably supported. The bridge 2 in turn rests on two, extending in the longitudinal direction the series of holes to be drilled extending rails 5 (the so-called "skid beams"), which belong to the fixed construction of a drilling or production platform and over which the bridge 2 with the carriage 1 in the longitudinal direction the row of holes to be drilled is moved in the direction of arrow II can be.

A support frame 6 (see FIG. 1) rests on the carriage 1

which on the one hand the turntable 7 is supported and on which on the other hand a cage-like structure 8 is releasably suspended, which extends between the two side parts la and Ib of the carriage 1 through downwards extends to a level below the bridge 2 Height. The cage 8 has a bottom 9 with a central opening 10, through which the drill pipe string and the guide column, as well as a transition piece to be used when ramming the guide column, pass well can.

At the bottom 9 is a fixed 11 by means of two detachable tie rods Pipe clamp 12 suspended. This pipe clamp is of a type known per se

030062/0337

which can be pneumatically or hydraulically contracted and expanded and is therefore only shown schematically in the drawing.

At a distance above the floor 9 and parallel to it, there is a support platform 13 which is attached to guide rods 14 in the cage 8 is guided along up and down movable and one to the middle of the opening aligned central opening 10a for the passage of the guide column, the drill pipe rods and any transition pieces. At platform 13 a second pipe clamp 16 is suspended by means of tie rods 15, which pipe clamp can be of the same type as the pipe clamp 12 and is itself between the floor. 9 and the pipe clamp 12 is located. The tie rods 14 are releasably attached to the support platform 13 and extend through openings in the bottom 9 downwards.

To move the support platform 13 with the movable pipe clamp 16 up and down, two hydraulic ones are used in the exemplary embodiment under consideration Piston-cylinder devices 17, the cylinder of which is fixedly mounted on the base 9 and the piston rods of which are connected to the support platform 13.

To enable movement of the device in the direction of the Arrow II above the rails 5, it may be necessary to loosen the pipe clamps 12 and the tie rods 11 or 15 of the cage 8.

The drilling table 7 which, incidentally, is of a type known per se

can be, is in the direction of arrow III between that shown in FIG effective position and a laterally lying ineffective position movable. to for this purpose there are two piston-cylinder devices in the exemplary embodiment under consideration 18 applied. In the inoperative position, a wide passage opening (which is not indicated in the drawing) released through which opening through the lead column, the drill pipe rod, transition pieces and even a ramming block can easily pass. The drilling table 7 is further by means of a

030 0 6 2/0337

power source not shown can be driven in a known manner.

In the support frame 6 an organ 19 is also mounted, which by means of two piston-cylinder devices 20 according to the arrow IV from a in the ineffective position shown in the drawing can be moved into an effective position. This organ 19 is used for temporary hanging and holding of drill rods, especially during the period in which the drill table is in the inoperative position.

The tower of the inventive The device is formed by a column 21 arranged eccentrically opposite the hole to be drilled on the carriage 1. This column consists of a support part 22 which is fixedly mounted on the carriage 1 and on which the actual column 23 is rotatably mounted. The rotating column 23 carries at its upper end a load arm 24 on which a tackle 25 provided for picking up and lowering Leitkolonnerohren in a radial direction Direction is movably suspended. The rotatable column 23 is further provided with a vertical guide track 26 along which a pile driver is mounted movably up and down, while near the top of the column one opposite the center line of the turntable (at least in its effective position) centered lifting point 28 is provided. This lifting point, in the form of a takei, is used to lower and lift drill rods set up and works together with a winch 29 present at the foot of the rotatable column.

Below is now a series of leading columns drifting into the ground described in more detail by means of the device described above.

2A shows the device according to the invention again in a position in which the load arm 24 is in a position in which the first leading column pipe 30 is taken as a collection point for such pipes. The drilling table 7 is in the laterally withdrawn inoperative position, while the ramming machine 27 and the lifting point 28 are also in the inoperative position. In the situation according to Figure 2b of the load arm 24 is provided with,

0300G2 / 0337

■? - 2926H1

the rig 25 and the lead column tube 30 suspended thereon in a position above the center line of the hole to be drilled. In this position, the pipe 30 \ is lowered until it can be gripped by the pipe clamps 12 and 16 with its lower end. The Rohr.3d is further detached from the load arm 24 so that it can be further lowered by the pipe clamps 12 and 16. The movable pipe clamp 16 is maneuvered in such a way that the upper end of the guide column pipe 30 protrudes just above the pipe clamp 16 when the ⁴ support platform 13 with the pipe clamp 16 is in the lower position.The pipe clamp is then actuated while the pipe clamp 16 is in its ineffective position ± n is brought to the upper position, ready to clamp the lower end of a following Leitkolonnenrohrs 30a, which has meanwhile been picked up by the released Lastarja by pivoting in the position according to Figure la and by pivoting back again above the center line of the hole. This phase is illustrated by Figure 2C and Figure 2D. In the position according to FIG. 2B, the two guide tubes 30 and 30a can be welded to one another at the point indicated by χ. Furthermore, by alternately pressing the pipe clamps 12 and. 16 and by moving the pipe clamp 16 up and down the guide tube set 30, 30a can be lowered step by step (see Figure 2E) until the upper end of the guide tube set protrudes just above the lower / fixed pipe clamp and this set is therefore in a Position in which it can be welded to the lower end of the next guide tube. The feeding and lowering of further guide tubes is continued until the lower guide tube of the column no longer penetrates the solid soil under water under the influence of its own weight. Then the moment has come in which the rotatable column 23 with the lifting point 28 is rotated into the operative position so that a row of drill rods from one located around the column, for example. The supply can be taken up, coupled and lowered through the already introduced guide line. For this purpose, the drilling table 7 is brought into its effective position

030062 / 0337-

- Y-

,? - 2926U1

then only to serve as a pipe clamp and thereby the "growing" drill rod to decrease gradually. After the drill rod has been rammed hanging in the lead column, for which purpose the drill table 7 temporarily in the transverse direction is moved away is with the help of the drilling table 7 and the usual Driving rod 31 drilled (see Figure 2F). By driving the drilling table a hole is then pre-drilled to a depth lying past the lower point of the leading column, into which the leading column is further lowered and by means of Piling can be driven further into the ground (see the phase according to FIG. 2G). Before the phase according to FIG. 2G can take place, of course, it should first the driving rod 31 are released and the drilling table is back in its to bring in an ineffective position. The drill rod is then temporarily held by the organ 19, which is brought into its operative position, until the moment in which the upper drill rod tube with the lower end of the usual transition piece 32 to be placed on the upper end of the upper guide tube is coupled. The device is then ready to carry out the ramming phase according to FIG. 2G.

After in this way a predetermined resistance to further Penetration into the ground is achieved, the device is brought back into a position in which, with the connection of further drill rods, drilled again which is followed by a ramming method, etc. Figure 2F shows that while the ramming is taking place, the load arm 24 is used to receive another draft tube 30c can be operated. The introduction of this guide tube could take place after the space machine has been brought into its inoperative position (see FIG. 2H).

030062/033 7

Read e

Claims (2)

TO SPEAKER 1. Device for introducing a guide column into the ground when drilling a . Oil or gas probe, especially for use on the coast with a tower for holding and lowering the lead column and the drill rod, as well as with a turntable for introducing the drill rod wherein there are means for temporarily holding the lowered guide column and wherein the turntable is slidable in a frame between an effective position centric to the axis of the probe to be drilled and one lateral, ineffective position, characterized in that means are provided in the turntable frame which can be moved between an ineffective one Position outside the path of the leading column and an effective position, these means being designed in such a way that they are straight in the effective position below the level of the turntable and when the latter is in its inoperative position, are suitable for holding a drill pipe. 2. Apparatus according to claim 1, characterized in that the tower by a column is formed which is arranged eccentrically with respect to the axis of the active turntable position, has at least one lifting arm and is provided with vertical guide means for a clearing device, wherein the guide means and the ramming device are pivotable between an inoperative position and an operative position in which the latter the The axis of the ramming device coincides with the axis of the effective turntable position. 03 0062/0337 ORIGINAL [WSPECTED