SU1222817A1 - Guiding arrangement for underwater well head - Google Patents

Description

The invention relates to the drilling and maintenance of subsea wells from floating drilling rigs (PBU), in particular, to devices for guiding guide ropes from floating drilling rigs to the subsea wellhead.

The purpose of the invention is to simplify the process of restoring communication between a floating drilling rig and a subsea wellhead.

FIG. 1 shows the device in the process of descent to the bottom, axonometrics; in fig. 2 — node I in FIG. one; in fig. 3 - device at the bottom; in fig. 4 — node II in FIG. 3

The device comprises a container 1 with a supply of a buoy rope 2 on the drum 3, the free end of which is attached to the buoy 4. On the shaft 5 of the buoy drum 3, on both sides of it, two pairs of additional drums 6 are rigidly mounted with guides wound on them the ropes 7, the ends of which are attached to the uprights 8 of the guide frame 9, the underwater wellhead 10. The direction of winding the ropes on the buoy drum 3 and the additional drums 6 of the guide ropes are mutually opposite. The container 1 is made in the form of a rectangular box with a bottom and walls, inside of which all rope drums are mounted on the same shaft.

Support legs 11 are attached to the bottom of the container, and a tip 13 is installed at the top of the top of the pyramidal frame 12 to grip the container with a self-releasing head 14 using a drill string 15. To brake the drums, after reaching the bottom of the container, the brake 16 is installed under the bead of one of the drums the rod 17c is a spring-loaded block 18 and the fifth; 19. The ta one protrudes under the bottom by an amount greater than the height of the legs 13, and therefore when the container reaches the bottom of the first

19, compressing the brake spring, inserts the rod with the shoe and locks the drum. Convenience of storing guide ropes to the drums is provided by an additional hand brake.

20.Cutting out of the container on the bottom of the kitsich rope on the bottom is made of a cutout 21 with guide rollers 22 (Fig. 3 and 4).

The device works as follows.

After the completion of the drilling of a well from a floating drilling rig that communicates with the underwater wellhead by means of guide ropes 7, the latter are disconnected from the pitching compensators of the floating rig. The disconnected ends of the guide ropes are inserted into the container 1 through the notches 21 between the rollers 22 and are attached to the drums 6. A buoy rope 2 is pre-wound onto the drum 3, the end of which is attached to the fixed element of the floating installation. Then the container 1 by means of drill pipes is lowered through the shaft of the floating installation to the bottom. Before the container is immersed by the hand brake 20

free drums.

When the container is immersed, the cable bundle unwinds from the displacer drum 3 and forcibly rotates the additional reels 6, on which the guide ropes are wound due to the differently directed winding of the displacer and guide ropes. The additional drums 6 wind up the guide ropes 7 coming from the mouth of the subsea well. After the container is installed on the bottom of the sea, near the underwater mouth, the first brake rests on the ground, sinks the rod inside the container and brakes

the drums.

The release of the container from the drill string 15 is performed by rotating the drill pipe together with the self-releasing head around the tip 13 of the container. After disconnecting the drill string from the container, proceeding to lifting the drill pipe onto the deck of the floating drilling rig, simultaneously disconnecting the end of the buoy cable from the floating drilling rig and attaching it to the buoy 4.

In order to re-approach the floating drilling rig to the underwater well for servicing the buoy 4, they locate the well and the submerged container 1. Lower the self-releasing head on the drill pipes, grab the tip 13 of the container 1 and lift it up along with the ends of the guides. ropes. The control over the docking of the self-releasing head with the container tip 13 is performed by the underwater camera run-down on the same drill pipe 15. Lifted onto the deck of the drilling vessel, the ends of the guide ropes are stored in the compensation system, which restores the cable directions between the drilling vessel and the underwater well.

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Claims (1)

SUBMISSION MOUNT GUIDE DEVICE, comprising a submarine mouth guide frame, a buoy, a container with a supply of a buoy rope, one end of which is attached to a buoy and the other to a drum, and guide ropes from the mouth to a floating drilling rig, characterized in that, for the purpose of to simplify the process of reconnecting a floating drilling rig with the mouth of a subsea well, the buoy drum is equipped with additional drums rigidly mounted on its axis for winding the ends of the guide ropes, and the directions and the buoy and ropes guiding opposite. 9uef to to go 00 m > 12;