JPH0613893Y2 - Underwater maintenance and inspection equipment exchange device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an underwater maintenance / inspection equipment exchanging device used for exchanging a control pod installed in a wellhead device of a well excavated on the sea floor. is there.

[Prior Art] When inspecting a wellhead device installed on the seabed, for example, a control pod attached to the wellhead device needs to be replaced regularly or when a failure occurs. Conventionally, various necessary operations on the seabed such as such a control pod have been performed by lowering various running tools installed at the tip of the installation / reentry riser from the sea onto the wellhead device on the seabed and using the running tool for opening and closing the cover. Then, using a running tool, you can pull up the equipment that needs to be exchanged and replace it with something that requires maintenance and inspection, and then transport the new equipment to the seabed and install it. It was taken.

[Problems to be solved by the invention] However, in the case of such a conventional method of exchanging equipment on the seabed, as described above, the equipment to be replaced must be pulled up to the sea and then the new equipment must be transported to the seabed. Therefore, it cannot be replaced by one dive, and it takes a long time for the replacement work.

Therefore, the present invention intends to provide an underwater maintenance / inspection equipment exchanging device capable of shortening the time required for exchanging work by performing diving once even in the case of performing maintenance inspection of a seafloor wellhead device. It is what

[Means for Solving the Problems] In order to achieve the above object, the present invention attaches a main body frame to a lower portion of a remotely operated submersible work boat, and attaches the main body frame to the front and rear portions of the main body frame. Guide pins for seating in the side opening are respectively supported so as to be vertically movable, and a lock device for fixing the position of the guide pin is provided at the lower end of each guide pin, and further, a trolley is provided in the main body frame. Is movably mounted in the horizontal direction, and the trolley is made to support a gripping device for detachably gripping devices through an elevating device, and in the main body frame,
A plurality of spaces for temporarily placing the devices gripped by the gripping device are provided.

[Operation] The operation of the submersible work boat and the opening and closing of the opening cover and the positioning of the body frame can be performed by the guide pins provided at the front and rear of the body frame and the locking device provided at the lower end of the body frame. Since the equipment can be moved horizontally by the trolley and the equipment can be moved up and down by the elevating device, the equipment can be maintained and inspected with a single seat of the body frame. When replacing the control pod as an example of equipment, by operating the submersible work boat, carry the main body frame to the opening, engage the guide pin with the opening cover, and swing the main body frame horizontally. After opening the opening cover, return the main unit frame to its original position, seat it in the opening, and in this state, temporarily place the new control pod that was transported in the temporary storage space. To the inside of the body frame,
Install the new control pod with the old control pod being pulled up temporarily placed in another temporary storage space. Therefore, replacement is performed by diving the body frame once.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 to FIG. 3 show an embodiment of the present invention and show a case where the invention is applied to a maintenance inspection such as replacement of a control pod installed in a wellhead device on the seabed. At the bottom of ROV (remotely operated unmanned submersible work boat) 1,
The main body frame 2 having a frame structure is integrally attached with bolts or the like, a rail 3 extending in the front-rear direction is provided at an upper position in the main body frame 2, and a hydraulic motor (or an electric motor) 4 is driven to perform the above-mentioned operation. The rail 3 is equipped with a trolley 5 that can be moved in the front-rear direction along the rail 3.
On the trolley 5, a hydraulic cylinder 6 for raising and lowering which expands and contracts in multiple stages (two-stage telescopic type in this embodiment) is faced downward, the head side which is the upper end thereof is fixed, and the piston rod of the hydraulic cylinder 6 is controlled. A running tool 8 for detachably gripping the pod 7 is suspended and supported by an auxiliary member 8'which is integrally attached to the lower portion of the running tool 8, and the running tool 8 is expanded and contracted by the hydraulic cylinder 6. So that it can be moved up and down between a position inside the body frame 2 and a position below the body frame 2,
Further, a pedestal 9 for temporarily placing the control pod 7 at the front position and the rear position is provided under the main body frame 2.
And 10 are provided.

The running tool 8 has a ring shape having a notch so as not to interfere with the front and rear pedestals 9 and 10 when it is moved up and down in the central portion of the main body frame 2, and the center of the ring is located at a required inner circumferential position. Hydraulic plunger that can project toward
It is configured with 11.

Brackets 12 and 13 are provided on the front side and the rear side of the main body frame 2 so as to project to the front and the rear, respectively, and a main guide pin 14 having a large diameter is attached to the bracket 12 on the front side and a rear side portion. Auxiliary guide pins 15 having a small diameter are vertically supported by the bracket 13 of the above, and each guide pin 14 and 15 is a multi-step telescopic type (in this embodiment, a two-step telescopic type).
The hydraulic cylinders 16 and 17 are expanded and contracted to move up and down with respect to the main body frame 2.

The wellhead device 18 on which the control pod 7 etc. are installed is
The inner cover 20 covering the opening 19 at the center of the wellhead is protected by an outer cover 21 arranged on the outer periphery of the inner cover 20, and the main guide pin 14 has a hole 22 in the inner cover 20 to be inserted. The auxiliary guide pin 15 corresponds to one hole 23 of the outer cover 21, the auxiliary guide pin 15 corresponds to the recess 24 on the inner cover 20 and the other hole 25 of the outer cover 21, and the main guide pin 14 At the lower end, for positioning and fixing in the hole 23 portion of the outer cover 21, and at the lower end of the auxiliary guide pin 15, for positioning and fixing in the recess 24 of the inner cover 20 and the hole 25 portion of the outer cover 21, Each has a lock device 26 incorporated therein.

As the lock device 26, for example, as shown in FIG. 4, a plurality of lock pins 31 movably arranged at the lower ends of the guide pins 14 and 15 in the radial direction and the base ends of the lock pins 31 are provided. The taper member 27 attached to the taper block 27, the taper block 28 that wedges with each taper member 27 at the same time, and the lock pin 31 is guided through the slide of the taper member 27 by pushing down the taper block 28. A lock cylinder 29 for projecting in a radial direction from the lock cylinder 29, and a spring 30 for urging the lock pin to be pulled into the guide pins 14, 15 when the taper block 28 is pulled up by the operation of the lock cylinder 29. Or a lock cylinder and a base end of the lock pin 31 as shown in FIG.
A pin 32 is connected to the lock pin 29 by a link 32, and the lock pin 31 is simultaneously moved in and out from the guide pins 14 and 15 via the link 32 by the expansion and contraction of the lock cylinder 29.

The various cylinders may be driven by using the power source of the ROV 1, or the drive source may be independently installed on the main body frame 2.

When the old control pod 7 installed on the wellhead device 18 is replaced with a new control pod 7 ′ by using the underwater maintenance / inspection equipment exchanging device having such a configuration, in advance on the ocean (on the carrier ship), Insert the new control pod 7'into the running tool 8 and insert each plunger 11
The new control pod 7'is held by the running tool 8 by making the running tool 8 protrude. or,
The trolley 5 is driven by driving the hydraulic motor (or electric motor) 4.
The position of the new control pod 7'is adjusted so that the new control pod 7'is suspended and supported in the central portion of the main body frame 2 so as not to be unbalanced during swimming.

In this way, the main body frame 2 in which the new control pod 7'is suspended and supported is transferred to the seabed by remotely operating the ROV 1 and placed on the inner cover 20 above the wellhead device 18. At this time, as described above, since the new control pod 7'is located in the central portion of the main body frame 2 and the front and rear are balanced, the ROV
Operation 1 is stable. Then, the main body frame 2
By operating the multi-stage hydraulic cylinders 16 and 17 on the front and rear sides respectively, the main guide pin 14 is inserted through the hole 22 of the inner cover 20 into one hole 23 of the outer cover 21, and the auxiliary guide Insert the pin 15 into the recess 24 on the inner cover 20,
Operate the locking device 26 to move the main guide pin 14 to the outer cover 21 and the auxiliary guide pin 15 to the inner cover.
Position it fixed at 20. In this operation, the lock cylinder 29 is extended to cause the lock pins 31 to project respectively, and the lock pins 31 are locked in the holes 23 and the recesses 24 to fix the position of the main body frame 2 ( (The solid line in Figure 1).

When the position of the body frame 2 is fixed, next, ROV1
The main body frame 2 is horizontally swung about the main guide pin 14 by utilizing the thrust force of the ROV 1 (state of the two-dot chain line in FIG. 1). As a result, the inner cover 20 is swung integrally with the main body frame 2, so that the opening 19 is formed on the wellhead device 18. After that, lock the lock device 26 of the auxiliary guide pin 15 with the inner cover.
The auxiliary guide pin 15 is pulled out from the recess 24 by operating the hydraulic cylinder 17 by releasing it from the recess 24 of the 20.
By operating 1, the main body frame 2 is swung back to the original position around the main guide pin 14 while the inner cover 20 is left at that position, and the auxiliary guide pin 15 is positioned above the other hole 25 of the outer cover 21. Located in the section. Then, the hydraulic cylinder 17 is operated to lower the auxiliary guide pin 15,
The auxiliary guide pin 15 is inserted into the hole 25 and locked by the lock device 26, and the main body frame 2 is lowered as a whole so that the main body frame 2 is seated in the opening 19 as shown in FIG.

When the body frame 2 is seated in the opening 19, the trolley 5 is then moved backward (to the right in FIG. 6), and the new control pod 7 ′ that has been suspended and supported is placed on the pedestal 10 at the rear. The trolley 5 is returned to the original central position and the running tool 8 is positioned in the central part of the main body frame 2 again by descending and temporarily placing (the state of the chain double-dashed line in FIG. 6). Next, the lifting hydraulic cylinder 6 is extended, and the running tool 8 is
Is lowered from the main body frame 2 to be positioned at the old control pod 7 portion on the wellhead device 18, and the old control pod 7 is gripped by the running tool 8. continue,
After shortening the lifting hydraulic cylinder 6 and pulling up the old control pod 7 into the main body frame 2, the pulled up old control pod 7 is moved forward by moving the trolley 5 forward (left in FIG. 6). Then, the hydraulic cylinder 6 is extended and temporarily placed on the pedestal 9 (indicated by a chain line in FIG. 6).

After that, the trolley 5 is moved backward, and the new control pod 7 ′ temporarily placed on the pedestal 10 at the rear is gripped by the running tool 8, and the gripped new control pod 7 ′ is attached to the main body frame 2. The new control pod 7 ′ is lowered and installed on the wellhead device 18 by moving to the central portion and extending the lifting hydraulic cylinder 6 again at that position. After installing the new control pod 7 ', pull up the running tool 8 into the main body frame 2, and attach the cradle 9 at the front.
The old control pod 7 temporarily placed on the top is gripped, and the gripped old control pod 7 is moved to the center.

In this way, after the old control pod 7 and the new control pod 7'are exchanged, the auxiliary guide pin 15 is unlocked by the lock device 26 and pulled out from the hole 25, and the main body frame 2 is entirely requisite amount. Raise and R again
The body frame 2 is rotated 180 ° by the operation of the OV1, the auxiliary guide pin 15 is fitted into the recess 24 and locked, and in this state, the ROV1 is operated to rotate the body frame 2 and the inner cover 20 is returned to the original position. Return it and close the opening 19.

Then, pull out the main guide pin 14 inserted into the holes 22 and 23 and the auxiliary guide pin 15 inserted into the recess 24,
The ROV 1 is operated to pull up the body frame 2 to the sea, and the old control pod 7 is collected.

As described above, the new control pod 7'and the old control pod 7 can be replaced by simply diving the main body frame 2 into the sea once, and the inner cover 20 can be opened and closed with the replacement. Can be done smoothly.

In the above embodiment, the replacement work of the control pod has been described, but it is optional to make the running tool 8 hold other devices and tools other than the control pod to perform the maintenance work. Needless to say, various changes can be made without departing from the spirit of the invention.

[Advantages of the Invention] As described above, according to the device exchanging device for underwater maintenance and inspection of the present invention, a trolley that moves in a horizontal direction is attached to a body frame attached to a lower portion of a remotely operated submersible work boat, Since the equipment gripping device supported by the trolley so as to be able to move up and down and the space for temporarily placing the equipment are provided, the equipment gripping device can be horizontally moved by the trolley in the sea, and can be freely moved up and down. Equipment replacement work is performed smoothly, especially if it is applied to the replacement work of the control pod attached to the submarine wellhead device, it becomes possible to perform the replacement work by diving the main frame once,
Further, since guide pins for seating the body frame in the opening and lock devices for fixing the positions of the guide pins are provided in the front and rear portions of the body frame, the opening and closing of the opening cover and the body accompanying the replacement work are performed. The positioning of the frame can be performed easily, and therefore the time required for replacement work can be greatly shortened, and efficient work can be performed during maintenance of other equipment. Be effective.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of an underwater maintenance / inspection equipment exchanging device of the present invention, FIG. 2 is a view taken along the line II-II in FIG. 1, and FIG. 3 is a line III-III in FIG. 4 and 5 are explanatory views of the lock device, and FIG. 6 is an explanatory view of the operating state. 1 ... ROV, 2 ... main body frame, 5 ... trolley, 6
...... Lifting hydraulic cylinder, 7, 7 '... Control pod, 8 ...... Running tool, 9, 10 pedestal, 14 ......
Main guide pin, 15 …… Auxiliary guide pin, 16, 17 …… Hydraulic cylinder, 20 …… Inner cover, 21 …… Outer cover, 22, 23, 25 …… Hole, 24 …… Recess, 26 …… Lock device .

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yoshihiro Muraki Inventor Yoshihiro Muraki 2-1-1 Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries, Ltd. Tokyo No. 1 Factory (72) Inventor Shohei Furukawa Shinnaka, Isogo-ku, Yokohama, Kanagawa Prefecture Haramachi No. 1 Ishikawajima Harima Heavy Industries Co., Ltd. Yokohama Second Factory (56) Reference JP 55-36591 (JP, A) JP 60-92592 (JP, A) JP 58-39322 (JP, B1)

Claims (1)

[Scope of utility model registration request] 1. A body frame is attached to a lower portion of a remotely operated submersible work boat, and guide pins for seating the body frame in an opening on the side of a wellhead device are vertically movable in front and rear portions of the body frame. A lock device for supporting and fixing the position of the guide pin is provided at the lower end of each of the guide pins, and further, a trolley is provided in the main body frame so that the trolley can be moved in the horizontal direction. A gripping device for gripping is supported via an elevating device,
An apparatus exchanging device for underwater maintenance and inspection, wherein a plurality of spaces for temporarily placing the devices gripped by the gripping device are provided in the main body frame.