JPH0714474Y2 - Control pod fitting / removal device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a fitting / dismounting device for a control pod that is installed in a wellhead device for a well drilled on the sea floor.

[Prior Art] When maintaining and inspecting a wellhead device installed on the seabed, the control pod attached to the wellhead device contains control equipment for controlling the wellhead device, which is very important for the wellhead device. Since it is a unique component, it needs to be replaced periodically or in case of failure. Conventionally, for such control pod replacement work, a special running tool (with position control device) removed from a large excavation rig, etc.
I was trying to do it.

[Problems to be solved by the invention] However, after the control pod is installed in water,
Since it is fixed for a long period of time, a secure lock is required when the control pod is fitted to the control pod base on the seabed. Therefore, in the past,
After fitting the control pod to the control pod base, lock the two via a special running tool, while unlock them via the special running tool when disengaging from the control pod base to replace the control pod. I am trying. These contributed to preventing the control pod from being inserted or removed.

Therefore, the present invention makes it possible to insert and remove the control pod and the control pod base without using a drilling rig or the like.
The ROV PLUS work package is used to lock and securely fix the crank sleeve from the inside so that the control pod can be easily inserted and removed.

[Means for Solving the Problems] In order to solve the above problems, the present invention vertically mounts an upper clamp sleeve having a protrusion protruding inward at the lower end at the lower end position of a control pod, and On the control pod base on the side of the wellhead device, a lower clamp sleeve having a protrusion projecting inward at the upper end is attached vertically corresponding to the upper clamp sleeve, and fitted to the protrusions of the upper and lower clamp sleeves. Circumferential division that has a concave portion of a size that can be accommodated and that expands and contracts by vertical movement of the clamp sleeves to fit in and out of the protrusions of both clamp sleeves from the inside to clamp and unclamp both upper and lower clamp sleeves. The mold lock segment is provided inside the upper and lower clamp sleeves.

[Operation] When the control pod is placed on the control pod base and the clamp ring is lowered, the lock segments are pushed open and fitted into the protrusions on the lower end of the upper clamp sleeve and the upper end of the lower clamp sleeve. When combined, both clamp sleeves are clamped and the control pod can be fixed.

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

FIG. 1 and FIG. 2 show an embodiment of the present invention, in which a skeleton is provided at the bottom of an ROV (remotely operated unmanned submersible work boat) 2 which can be remotely controlled from the sea via a dither cable 1. The work package 3 having a frame structure is integrally attached as a submersible maintenance / inspection device main body frame, and guide plates 4 and 5 projecting forward and backward are provided on the front side and the rear side of the work package 3, respectively, and the front side The main guide pin 6 having a large diameter is supported by the guide plate 4 of the rear portion, and the auxiliary guide pin 7 having a small diameter is supported by the rear guide plate 5 in the vertical direction. Are respectively installed between the work package 3 and the respective intermediate portions of the guide pins 6 and 7, and the work package 3 is formed by the expansion and contraction movements of the multi-stage telescopic type (two-stage telescopic type in this embodiment) hydraulic cylinders 8 and 9. Up and down So as to be sera, constitute an underwater maintenance device 10, whereas, a cover for protecting the wellhead
When the underwater maintenance / inspection device 10 is properly set in the opening 12 of the cover 11, the large and small positioning holes 13 and 14 are provided in the peripheral portion of the opening 12 of the cover 11, and the guide pins 6 and 7 are set to the positioning holes. The submersible maintenance / inspection device 10 is inserted into the inside of 13, 14 so as to be positioned by being guided over the opening 12.

The present invention supports a control pod 16 so as to be movable up and down via a hydraulic cylinder 15 vertically arranged in the work package 3 so as to form a part of the underwater maintenance / inspection device 10, and further, the control pod 16 is supported. A lock device 18 is provided for locking and unlocking the control pod 16 and the control pod base 17 from the inside when the control pod base 17 is inserted into and removed from the control pod base 17 of the wellhead device (not shown).

The lock device 18 used for inserting and removing the control pod 16
As shown in detail in FIG. 2, the upper end of an upper clamp sleeve 20 having a protruding portion 19 protruding inward and having a tapered surface on the upper surface at the lower end is attached to the central position of the lower end of the control pod 16. At the same time, a lower clamp sleeve 22 having a protrusion 21 projecting inward and having a tapered surface on the lower surface at the upper end is provided at the center of the control pod base 17 so as to correspond to the upper clamp sleeve 20 above and below. In addition, the lock segment 26 is mounted inside the upper and lower clamp sleeves 20 and 22 so that the lock segment 26 can be expanded and contracted. The lock segment 26 is configured to be divided into a plurality of pieces (for example, 16 pieces) in the circumferential direction, and each lock segment 26 is located at the lower position of the outer side surface, and the protrusions 19, 22 of the upper and lower clamp sleeves 20, 22 are provided. Both upper and lower clamp sleeves 20 and 22
Clamping concave portion 23 for clamping, and is bent in a dogleg shape as a whole to form tapered surfaces 24 and 25 at the upper end and the lower end of the inner surface, respectively,
When the 26 are connected to each other to form a tubular shape, both the upper end and the lower end are tapered, and the lock recess 26 of the circumferential multiple division structure is projected by the clamping recess 23. It is arranged in the upper clamp sleeve 20 so as to be positioned corresponding to the portion 19. Further, the inside of the lock segment 26 is brought into contact with the taper surface 25 of the lock segment 26 by pushing down to open each lock segment 26 to the outside so that the clamp recess 23 is fitted to the protrusions 19 and 21. Both upper and lower clamp sleeves 20 and 22 are clamped, and when they are raised, they contact the tapered surface 24 of each lock segment 26 and both upper and lower clamp sleeves
A clamp ring 32 for unclamping 20, 22 and at the same time holding each lock segment 26 in a position so as not to drop is positioned, and the clamp ring 32 is
Attach the nut 33 to the lower end of the clamp rod 27 that is vertically arranged.
The clamp pod 27 is fixed by a stepped spacer 34, and the upper end of the clamp rod 27 is detachably connected to the rod tip (lower end) of the hydraulic cylinder 15 by a detaching mechanism (not shown). Before placing on the pod base 17, the control pod 16 can be moved up and down by the expansion and contraction operation of the hydraulic cylinder 15, and the control pod 16 is moved to the control pod base.
After being mounted on 17, the upper and lower clamp sleeves 20 and 22 can be clamped and unclamped by expanding and contracting the hydraulic cylinder 15.

Further, on the upper surface of the control pod base 17, several small guide pins 28 are provided in a protruding manner, and various connectors 29
On the other hand, on the lower surface of the control pod 16, when the control pod 16 is placed on the control pod base 17, a pin hole 30 to be fitted into the small guide pin 28 and the various connectors 29 are provided. And a connector 31 to be connected to each.

If you want to perform a series of work to remove the old control pod from the control pod base 17 of the wellhead device and replace it with the new control pod 16 due to a failure etc., remotely operate ROV 2 from the sea The work package 3 is transferred to the seabed, and the work package 3 is positioned on the opening 12 of the cover 11 that protects the wellhead device. Next, first, the multi-stage hydraulic cylinder 8 on the front side of the work package 3 is operated to insert the positioning hole 13 main guide pin 6 of the cover 11 from above to anchor the work package 3 and the cover 11, and then the work package. While manipulating the multistage hydraulic cylinder 9 on the rear side of the cover 3 and adjusting the rotation of the whole, the auxiliary guide pin 7 is inserted into the positioning hole 14 of the cover 11 from above and positioned. This allows
The work package 3 is correctly guided and fixed to the opening 12 of the wellhead device. At this time, depending on the situation, the guide pins 6 and 7 are made to correspond to the positioning holes 13 and 14 to cover the cover.
11 If the work package 3 is located on the cover, the cover
After the work package 3 is placed on the table 11, the guide pins 6 and 7 may be lowered and inserted into the positioning holes 13 and 14 to be fixed.

In this way, when the position of the work package 3 is fixed, the old control pod on the control pod base 17 is removed and then the new control pod 16 is removed.
To the control pod base 17. When this fitting work is performed, first, the hydraulic cylinder 15 is extended to lower the control pod 16 and place it on the control pod base 17. At this time, when the control pod 16 descends, first, the pin hole 30 is fitted into the small guide pin 28 on the control pod base 17, so that the entire position of the control pod 16 is correctly guided. , Each connector 31 is connected to the corresponding connector 29. At the same time, the projection 19 at the lower end of the upper clamp sleeve 20 is positioned on the projection 21 at the upper end of the lower clamp sleeve 22 to correspond to it.

As described above, while the control pod 16 is being lowered by the extension operation of the hydraulic cylinder 15, the lower end portion of the clamp rod 27 connected to the rod of the hydraulic cylinder 15 as shown in the left half of FIG. The clamp ring 32 is engaged with the tapered surface 24 of the inner surface of each lock segment 26, and the lower portion of each lock segment 26 is in a narrowed state. When the hydraulic cylinder 15 is further extended after the control pod 16 is placed on the control pod base 17, the clamp ring 27 is lowered by lowering the clamp rod 27. The engagement with the tapered surface 25 is released and the lower portion of each lock segment 26 is pushed outward by this engagement, and as a result, as shown in the right half of FIG. Clamping recess 23 is fitted from inside to the projections 19 and 21 of the upper and lower clamp sleeves 20 and 22, and the wedge force between the upper and lower tapered portions of the projections 19 and 21 and the clamping recess 23 by this fitting. By the action of both upper and lower clamp sleeve 2
0 and 22 are clamped and locked, and the fitting of the control pod is completed.

After the control pod 16 is installed and fixed on the control pod base 17 by locking the upper and lower clamp sleeves 20 and 22, the hydraulic cylinder 15 is detached from the upper end of the clamp rod 27 to detach the control pod 16 from the work package 3. Cylinder force does not act on the clamp rod 27 due to this disconnection, but the inclination angle of the outer surface of the clamp ring 32 and the tapered surface 25 of the lock segment 26 is set small, for example, 4.5 °, and the friction coefficient is set to 0.08 or more. By doing so, it is possible to keep the engagement of both of them from loosening naturally, and it is possible to maintain the self-locking state in which the locking is reliably performed. Therefore, the control pod 16 can be installed in water for a long time.

When it is necessary to remove the control pod 16 from the control pod base 17 and collect it on the sea, the underwater maintenance / inspection device 10 is set on the opening 12 of the cover 11 and the rod of the hydraulic cylinder 15 is clamped by the clamp rod 27. Then, the hydraulic cylinder 15 is contracted. When the hydraulic cylinder 15 is contracted, the clamp ring 27 is lifted to raise the clamp ring 32 and the upper end side of each lock segment 26 is pushed outward to open the lower end side of the tapered surface 25 of each lock segment 26. As a result of the contraction in one direction, the clamp recesses 23 fitted in the protrusions 19 and 21 of the upper and lower clamp sleeves 20 and 22 are released, and the upper and lower clamp sleeves 20 and 22 are unclamped. Therefore, after that, when the hydraulic cylinder 15 is further contracted, the control pod 16 is removed from the control pot base 17, so that the removal of the control pod 16 is completed and the control pod 16 can be easily recovered.

As described above, in the present invention, the upper and lower clamp sleeves 20 and 22 are clamped and unclamped by the lock segment 26 by vertically moving the inner peripheral side clamp ring 32, and the control pod 16 is locked at the central portion. Since it can be performed from the inside, the control pod 16 can be downsized as compared with the method of locking from the outside, and a significant economic effect can be obtained because a large drilling rig is not used.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and application to other underwater structures is arbitrary, and it is needless to say that various changes can be made without departing from the scope of the present invention. is there.

[Advantage of the Invention] As described above, according to the control pod fitting / dismounting device of the present invention, the control pod and the control pod base can be fitted / disengaged by the lock mechanism inside the clamp sleeve. , The control pod can be securely locked and fixed, and the control pod can be downsized, which is an excellent effect.

[Brief description of drawings]

FIG. 1 is a schematic view showing an example of an underwater maintenance / inspection device used when replacing a control pod, and FIG. 2 is a sectional view showing an embodiment of a control pod fitting / removing device of the present invention. 3 ... ROV, 3 ... work package, 10 ... underwater maintenance / inspection device, 15 ... hydraulic cylinder, 16 ... control pod, 17 ... control pod base, 18 ... lock device, 19 ... protrusion, 20 …… Upper clamp sleeve, 21
...... Protrusion, 22 ...... Lower clamp sleeve, 23 ...... Clamping recess, 26 …… Lock segment, 27 …… Clamp rod, 32 …… Clamp ring.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Fumio Kaji, 2-1-1 Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries Ltd. Tokyo No. 1 factory (72) Shohei Furukawa Shinnaka, Isogo-ku, Yokohama, Kanagawa Prefecture Haramachi No. 1 Ishikawajima Harima Heavy Industries Co., Ltd. Yokohama No. 2 Factory (72) Creator Tokumasa Arashima No. 1 Shin-Nakaharacho, Isogo-ku, Yokohama, Kanagawa Ishi Kawashima Harima Heavy Industries Co., Ltd. Yokohama No. 2 Factory (56) References Sho 62-6095 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. An upper clamp sleeve having a protrusion protruding inward at its lower end is vertically mounted at the lower end of the control pod, and is protruded inward at the upper end of a control pod base on the wellhead device side. A lower clamp sleeve having a protrusion is attached vertically corresponding to the upper clamp sleeve, and a concave portion having a size that can be fitted to the protrusions of the upper and lower clamp sleeves is provided on the outer surface and the upper and lower sides of the clamp ring. A circumferential split lock segment is provided on the inside of both upper and lower clamp sleeves, which is expanded and contracted by movement to fit and disengage from the inside of the protrusions of both clamp sleeves to clamp and unclamp both upper and lower clamp sleeves. A characteristic control pod insertion / removal device.