JPH0324476Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an undersea metering device for an undersea relay station in an undersea oil production system.

Generally, when transporting workers and equipment to an undersea transfer station for offshore oil production, the lower skirt of a service capsule lowered into the sea from a support vessel is placed in a centering mechanism on the upper access trunk of the manifold cellar of the undersea transfer station. Connection work is done while using the device.

By the way, in the underwater metering device used for the above-mentioned connection work, it is necessary to remove the centering mechanism after the connection is completed. The main body of the centering hardware has a split/bolt structure, and in order to ensure strength, the centering hardware itself has to be large.For this reason, the centering hardware, which has a large body and is heavy, must be placed between the lower skirt of the service capsule and the manifold cellar. It is necessary to remove the cable by dividing it at the input in the narrow space between the access trunks, but conventional underwater metering equipment does not have a structure in which the end socket of the downhole cable can be removed through the opening of the centering metal fitting. Difficult to remove,
For this reason, there is the problem that it takes time to secure a communication path between the service capsule and the manifold cellar after the connection is completed, but the end socket can be removed from the centering hardware, and the removal operation is easy and can be performed in a short time. It is hoped that

In view of the above-mentioned points, the present invention provides an underwater metering device that allows the centering mechanism for aligning the lower skirt of a service capsule with the access trunk of a submarine relay station to be easily removed during connection work. The purpose is to

For this reason, the underwater metering device of the present invention is
An access trunk centering hardware disposed within the access trunk of an undersea relay station along the central axis of the access trunk, and a stopper that can be engaged within a conical inner wall of the centering hardware;
a downhole cable having an end socket at its lower end that engages the stopper and is suspended from a winch in the lower skirt of the service capsule; and a bolt capable of securing the stopper to the centering hardware. The present invention is characterized in that the fastener has a two-piece structure so that the fastener can be disassembled and removed from the end socket when the bolt is removed.

Below, an underwater metering device as an embodiment of the present invention will be explained with reference to the drawings. FIG. 1 is a longitudinal sectional view showing its usage state, FIG. 2 is an enlarged view of the part shown in FIG. 1, and FIG. 4 is a plan view of the centering hardware in the device, FIG. 5 is a longitudinal sectional view of the stopper in the device, and FIG. 6 is a plan view of the stopper.

As shown in Fig. 1, a service capsule 1 is suspended into the sea via a backhaul cable 7 from a support ship (not shown) floating on the water surface, and the lower skirt 2 of this service capsule 1 is connected to a submarine relay. Workers, equipment, etc. in the service capsule 1 are carried into the manifold cellar 8 so as to be connected to an access trunk 9 at the top of the manifold cellar 8 at the base.

The underwater metering device used for the above-mentioned connection work is provided with an access trunk centering hardware 10 disposed along the central axis within the access trunk 9, and this centering hardware 10 is arranged as shown in FIG. Three lashing wires 12 and a connecting pin 14 are secured to the inner wall of the trunk 9 via a lashing piece 11.
Supported by (See FIGS. 3 and 4) As shown in FIG. 3, a truncated conical stopper 15 is provided to engage with the conical inner wall 10a of the centering hardware 10.
A conical end socket 13 at the lower end of the downhole cable 6 can be engaged with a guide hole 15a passing through the cable up and down.

As shown in FIGS. 3 and 4, the centering hardware 10 is provided with an opening 19 that communicates upwardly in the conical inner wall 10a.

Note that the downhole cable 6 is connected to the lower skirt 2 of the service capsule 1, as shown in FIG.
It is adapted to hang down from a winch 3 inside through a leading block 5 and a centering hardware 4 for the lower skirt.

By the way, in the device of the present invention, the stopper 15 that engages within the centering hardware 10 as shown in FIG. 3 has a two-split structure as shown in FIG. have.

Further, as shown in FIGS. 5 and 6, the stopper 15 has a stopper groove 16 formed at its peripheral edge.
The bolt 17 that is screwed into the screw hole 18 of the centering metal fitting 10 is fitted into the retaining groove 16, so that the stopper 15 is restrained within the centering metal fitting 10. (See Figure 3) With the above configuration, in the state shown in Figure 1, when the winch 3 in the lower skirt 2 of the service capsule is operated to wind the downhaul cable 6, the backhaul cable 7 is let out. , the service capsule 1 gradually settles.

Then, when the service capsule 1 begins to approach the access trunk 9, the lower skirt centering hardware 4 and the access trunk centering hardware 10 approach each other, so that the center axis of the lower skirt 2 is aligned with the center axis of the access trunk 9. In this way, the connection (mating) between the lower skirt 2 and the access trunk 9 is performed.

After the connection work is completed, lower skirt 2
Then, the seawater inside the access trunk 9 is drained, and the worker transfers from inside the service capsule 1 to the inside of the access trunk 9 through the inside of the lower skirt 2, and moves from the access trunk centering hardware 10 to the lower end of the downhole cable 6. Remove the end socket 13.

At that time, with the underwater metering device of this invention,
The end socket 13 can be removed very easily by the following operation.

That is, unscrew the bolt 17 and remove the retaining groove 16.
After pulling it out from the cable, the downhole cable 6 is slightly loosened and the end socket 13 is lowered, so that the two-split structure stopper 15 can be easily disassembled and detached from the circumferential outer surface of the end socket 13. do.

After the stopper 15 has been removed from the centering hardware 10 in this manner, the end socket 13 is pulled upwardly through the opening 19 of the centering hardware 10.

Then, by removing the lashing wire 12, the centering hardware 10 is also put away, and a work space for transporting equipment is secured.

In addition, when the service capsule 1 rises to the surface,
The end socket 13 of the downhole cable 6 is attached to the centering hardware 10 by the reverse procedure of the above-described removal operation.

As described in detail above, according to the underwater metering device of the present invention, the access trunk centering hardware is disposed along the center axis of the access trunk in the access trunk of a submarine relay station, and the centering hardware has a conical shape. a downhole cable having an end socket at its lower end that engages with the inner wall and is suspended from a winch in the lower skirt of the service capsule; It has a simple structure in which a bolt is provided that can be restrained to the centering hardware, and the fastener is divided into two parts so that when the bolt is removed, the fastener is disassembled and removed from the end socket. Then,
The work of removing and attaching the downhole cable end socket from the access trunk hardware can be done easily and in a short time, and there is an advantage that space for carrying equipment and working inside the access trunk can be easily secured.

[Brief explanation of the drawing]

The figures show an underwater metering device as an embodiment of the present invention, in which Fig. 1 is a longitudinal sectional view showing its usage, Fig. 2 is an enlarged view of the part shown in Fig. 1, and Fig. 3 is an enlarged view of the part shown in Fig. 1. FIG. 4 is a plan view of the centering hardware in the device, FIG. 5 is a longitudinal sectional view of the stopper in the device, and FIG. 6 is a plan view of the stopper. 1... Service capsule, 2... Lower skirt, 3... Winch, 4... Centering hardware for lower skirt, 5... Leading block, 6
... Downhole cable, 7 ... Backhole cable, 8 ... Manifold cellar, 9 ... Access trunk, 10 ... Centering hardware for access trunk, 10a ... Conical inner wall, 11 ...
lashing piece, 12... lashing wire, 13... end socket, 14... coupling pin, 15... stopper, 15a... guide hole, 16... stop groove, 17...
...Bolt, 18...Screw hole, 19...Opening, 2
0...Two parts.

Claims (1)

[Scope of utility model registration request] An access trunk centering metal fitting disposed along the central axis of the access trunk in the access trunk of a submarine relay station, a stopper that can be engaged within the conical inner wall of the centering metal fitting, and a stopper that engages with the stopper. a downhole cable having an end socket at its lower end to hang down from a winch in the lower skirt of the service capsule, and a bolt capable of restraining the stop fitting to the centering hardware, the bolt being removed from the service capsule. The undersea mating device is characterized in that the fastener has a two-piece structure so that the fastener can be disassembled and removed from the end socket.