JPH0235598Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a center link device for multiple downhole cables suitable for use when landing a submersible such as a service capsule at an undersea base or the like.

[Conventional technology]

As shown in FIG. 5, in order to land the service capsule 10 as shown in FIG. 7 on the upper part of the manifold cella 9 installed on the seabed, there is generally a cylindrical structure connected to the service capsule 10 in a watertight manner. An access trunk 8 is provided.

Inside the access trunk 8, a downhole cable 6 connected to the service capsule 10 is wound up on a reel 7 and stored, and a recall buoy 3 is installed to float the tip of the downhole cable 6 to the ocean. The tip of the downhole cable 6 is connected to the recall buoy 3 via the joint 5 and the buoy rope 4.
It is connected to the.

On the other hand, in order to guide the service capsule 10 to the center of the access trunk 8 via the downhole cable 6, a centering hardware 1' is provided in the access trunk 8 so as to be penetrated by the downhole cable 6.

As shown in FIGS. 8 and 9, each centering hardware lashing wire 2 is attached to a plurality of (three in FIGS. 8 and 9) eye plates 1'a formed on the outer periphery of the centering hardware 1'. The socket 14 at the tip is connected by the pin 16, and
The centering hardware 1' is positioned on the central axis of the access trunk 8 by attaching the proximal end of the centering hardware lashing wire 2 to the inner circumferential surface of the access trunk 8.

In addition, in FIGS. 8 and 9, only one centering hardware lashing wire 2 is shown, and the other two are omitted from illustration.

Further, a socket 15 is attached to the base end of the downhole cable 6 wound on the reel 7, and when the downhole cable 6 is all pulled out from the reel 7, this socket 15 is attached.
engages with the centering hardware 1' from below,
It is adapted to be fixed on the central axis of the access trunk 8.

A downhole cable centering device is constructed from these centering hardware 1', centering hardware securing wire 2, and the like.

When the service capsule 10 is lowered and landed on the manifold cellar 9 on the seabed from the ocean using the centering device as described above, as shown in FIG. As a result, the recall buoy 3 inside the access trunk 8 is released and floated to the ocean. Along with this, the buoy rope 4 and the joint 5 are attached to the recall buoy 3.
The downhole cable 6 connected via
It is pulled out from the reel 7, passes through the centering hardware 1', and its tip is guided out to sea.

Next, the tip of this downhole cable 6 was pulled up, and as shown in FIGS. 8 and 9, the entire downhole cable 6 was pulled out from the reel 7, and the socket 15 at its base end was engaged with the centering hardware 1'. Thereafter, as shown in FIG. 7, the tip of the downhole cable 6 is connected to a winch 12 provided in a cylindrical skirt 11 at the bottom of the offshore service capsule 10 to be lowered. At this time, the downhole cable 6 passes through the centering hardware 13 in the skirt 11 and passes through the winch 12.
and is always arranged on the central axis of the skirt 11.

In this state, by driving the winch 12 to reel in the downhole cable 6, the service capsule 10 sinks toward the manifold cellar 9 on the seabed, as shown in FIG.
Since the downhole cable 6 is always placed on the central axis of the access trunk 8 and the skirt 11 by the centering hardware 1' and 13, respectively, the service capsule 10 is connected to the skirt 11 and the access trunk 8 of the manifold cellar 9. These skirts 11 are guided to the manifold cellar 9 so that their axes coincide with
By connecting the access trunk 8 and the manifold cellar 9 of the service capsule 10,
Complete landing on the ship.

[Problem that the invention attempts to solve]

However, in the conventional downhole cable centering device described above, due to the structure of the centering hardware 1' on the manifold cellar 9 side, only one downhole cable 6 can be provided by penetrating the centering hardware 1'. Therefore, a plurality of recall buoys 3 cannot be installed in the access trunk 8 while being connected to a plurality of downhole cables 6 at the same time. Therefore, in the unlikely event that the recall buoy 3 cannot be removed from the access trunk 8 or floated due to a malfunction, it becomes impossible to lead the downhole cable 6 to the ocean, and the downhole cable 6 There is a problem in that the service capsule 10 cannot be guided to the manifold cellar 9 using the .

Therefore, the service capsule 10 is equipped with a thruster as a means of backing up in the event of a failure of the recall buoy 3, and in the event of an emergency, the service capsule 10 can be lowered using the thruster and landed on the manifold cellar 9. However, with such a method, the service capsule 10
There are problems in that the structure becomes complicated and the manufacturing cost also increases.

The present invention attempts to solve these problems by providing multiple downhole cables and allowing multiple recall buoys to be installed, so that it can be used for landing work such as service capsules on the manifold cellar. An object of the present invention is to provide a centering device for multiple downhole cables with improved reliability.

[Means for solving problems]

Therefore, the centering device for multiple downhole cables of the present invention includes a base member positioned on the central axis of the access trunk in the access trunk above the manifold cellar;
The base member includes a centering metal fitting that is swingably attached to the center of the upper part of the base member through a universal joint, and a plurality of slots are formed that penetrate from the lower peripheral surface of the centering metal piece to the upper end surface of the centering metal piece. The feature is that a downhole cable is inserted into each.

[Effect]

In the above-mentioned centering device for multiple downhole cables of the present invention, a plurality of slots are formed in the centering metal fitting attached to the base member, so the downhole cables are passed through each of these slots to connect each downhole cable. A recall buoy can be connected to the hole cable.

〔Example〕

Hereinafter, a centering device for multiple downhole cables as an embodiment of the present invention will be explained with reference to the drawings. Fig. 1 is a side view showing the base member and centering metal fittings partially cut away, and Fig. 2 shows the device. A plan view of the equipped manifold cellar, Figure 3 is a schematic side view showing the state in which the recall buoy connected to the downhole cable is floating, and Figure 4 is a diagram showing how the service capsule is lowered using this device. FIG.

As shown in Figures 1 and 2, a service capsule 1 is placed on the top of the manifold cellar 9 installed on the seabed.
0 (see FIG. 4) is provided, and within this access trunk 8, a plurality of (three in this embodiment) eyes formed on the outer periphery of the base member 18 are provided. The sockets 14 at the tips of the base member lashing wires 2' are connected to the plate 18a by pins 16, and the base ends of the base member lashing wires 2' are attached to the inner peripheral surface of the access trunk 8. Therefore, the base member 18 is positioned on the central axis of the access trunk 8. In FIG. 1, only one base member lashing wire 2' and one eye plate 18a are shown, and the other two are omitted from illustration.

On the other hand, at the center of the upper part of the base member 18, the centering hardware 1 is swingably attached via a universal joint 17 disposed on the central axis of the access trunk 8.

Two slots 1a and 1b are formed in this centering hardware 1, passing through from the lower circumferential surface to the upper end surface of the centering hardware 1, and these slots 1a and 1b are connected to downhole cables 6a and 1b.
6b are provided through each of them.

Further, the tips of the downhole cables 6a, 6b are connected to recall buoys 3a, 3b removably provided in the access trunk 8 via joints 5a, 5b and buoy ropes 4a, 4b, respectively. Hall cable 6a, 6
The proximal end of b is the reel 7 in the access trunk 8.
A and 7b are respectively wound up and stored.

Further, a socket 15a is attached to the base end of the downhole cable 6a, 6b (however, the socket of the downhole cable 6b is not shown), and the downhole cable 6a, 6b is connected to the reel 7a, 7b. When the socket 15a is completely pulled out, the socket 15a comes into contact with the lower circumferential surface of the centering hardware 1 and is fixed, as shown in FIG.

Since the centering device for multiple downhole cables of the present invention is constructed as described above, when the service capsule 10 is lowered from the ocean to the manifold cellar 9 on the seabed and landed, the first step is as shown in FIG. , The recall buoy 3a in the access trunk 8 is released and floated to the ocean by remote control from a mother ship not shown in the ocean. Along with this, the downhole cable 6a connected to the recall buoy 3a via the buoy lobe 4a and the joint 5a is pulled out from the reel 7a, passes through the slot 1a of the centering hardware 1, and its tip is guided offshore. .

Next, pull up the tip of this downhole cable 6a, pull out the entire downhole cable 6a from the reel 7a as shown in FIG. After that, as shown in FIG. 4, the tip of the downhole cable 6a is moved to a winch 12 installed in the cylindrical skirt 11 at the bottom of the offshore service capsule 10 to be lowered.
Connect to. At this time, downhole cable 6
a is guided to the winch 12 through a centering hardware 13 within the skirt 11, and is always arranged on the central axis of the skirt 11.

In this state, by driving the winch 12 and winding the downhole cable 6a,
The service capsule 10, as shown in FIG.
It sinks toward Manifold Sera 9 on the ocean floor.

At this time, since tension is applied to the downhole cable 6a, a moment is generated around the center point C of the universal joint 17. As a result, the centering hardware 1 rotates so that the center point C of the universal joint 17 and the center point A of the upper opening of the slot 1a are located on the same vertical line. Therefore, the downhole cable 6a comes to be arranged on the central axis of the access trunk 8, so that when the service capsule 10 descends and approaches the access trunk 8, the action of the centering hardware 13 on the service capsule 10 side Together, the same service capsule 1
0 and the access trunk 8 of the manifold cellar 9 are guided to the manifold cellar 9 so that their axes coincide with each other. By connecting these skirts 11 and the access trunk 8, landing of the service capsule 10 on the manifold cellar 9 is completed.

In addition, if the recall buoy 3a etc. breaks down and it is no longer possible to levitate the same recall buoy 3a, the recall buoy 3b can be levitated using the same procedure as described above, and the service capsule 1
0 can be settled and landed on the manifold cella 9.

At that time, when tension is applied to the downhole cable 6b, a moment is generated around the center point C of the universal joint 17, and the centering hardware 1 rotates.
The center point C of the universal joint 17 and the center point A' of the upper opening of the slot 1b are now located on the same vertical line.

In this way, downhole cables 6a, 6b
No matter which one is used, when using it, the action of the universal joint 17 allows the downhole cables 6a,
6b is arranged on the central axis of the access trunk 8, so the function of the centering hardware 1 as a centering device is not impaired.

Although this embodiment shows a case in which two downhole cables are provided, by increasing the number of slots in the centering hardware 1, even more downhole cables can be provided. Moreover, when the service capsule 10 is lowered and landed on the manifold cellar 9 using each downhole cable, the function of the centering hardware 1 as a centering device is not impaired due to the action of the universal joint 17.

[Effect of idea]

As detailed above, according to the centering device for multiple downhole cables of the present invention, in the access trunk at the top of the manifold cellar,
It has a base member positioned on the central axis of the access trunk, and a centering hardware that is swingably attached to the center of the upper part of the base member via a universal joint, from the lower peripheral surface of the centering hardware to the upper end surface. It has an extremely simple configuration in which multiple slots are formed through the holes, and downhole cables are inserted into each of these slots, and it is possible to have multiple downhole cables and the same number of recall buoys, as well as to The downhole cable can also be used without impairing the original function of the centering hardware due to the action of the universal joint, so it is possible to greatly improve the reliability of landing work on the manifold cellar, such as a service capsule.

[Brief explanation of drawings]

1 to 4 show a centering device for multiple downhole cables as an embodiment of the present invention, FIG. 1 is a side view with the base member and centering hardware partially cut away, and FIG. A plan view of the manifold cellar equipped with this device, FIG. 3 is a schematic side view showing the recall buoy connected to the downhole cable floating, and FIG. 4 is a schematic side view of the manifold cellar equipped with this device. Fig. 5 is a schematic side view showing a state where cables are being settled, and Figs. 5 to 9 show a conventional downhole cable centering device, and Fig. 5 is a schematic side view showing a manifold cellar equipped with the same device. Figure 6 is a schematic side view showing the state in which the recall buoy connected to the downhole cable is floating, and Figure 7 is a schematic side view showing the state in which the service capsule is lowered using the same device. FIG. 8 is a side view showing the centering hardware cut away, and FIG. 9 is a sectional view taken along the - arrow in FIG. 8. 1...Centering hardware, 1a, 1b...Slot hole, 2'...Base member lashing wire, 3a, 3b
... Recall buoy, 4a, 4b ... Buoy rope,
5a, 5b...Joint, 6a, 6b...Downhole cable, 7a, 7b...Reel, 8...Access trunk, 9...Manifold cellar, 10...
...Service capsule, 11...Skirt, 12...
...Winch, 13...Centering hardware, 14...
... socket, 15a ... socket, 16 ... pin, 17 ... universal joint, 18 ... base member, 1
8a...Eye plate.

Claims (1)

[Scope of utility model registration request] In the access trunk at the top of the manifold cella, the centering hardware is provided with a base member positioned on the central axis of the access trunk, and a centering hardware swingably attached via a universal joint at the center of the upper part of the base member. A centering device for multiple downhole cables, characterized in that a plurality of slots are formed passing through from the lower peripheral surface of the hardware to the upper end surface, and downhole cables are fitted into each of these slots.