JPH026151Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a BOP stack transfer device for an oil drilling barge.

In offshore oil drilling, when a blowout occurs from the well or the gap between the casing and the drill pipe during drilling or well completion work, or when signs of a blowout appear, the pressure is transferred to the wellbore. The BOP stack, which is a blowout preventer installed above the wellhead for containment and control, weighs between 100 and 200 tons, and such heavy objects are used during the drilling preparation process on offshore oil drilling barges. The task of assembling these under poor working conditions was extremely difficult and dangerous.

Therefore, conventionally, such a BOP stack is a lower part stored on the deck 1 of an oil drilling barge, as shown in the plan view in Figure 1 and the vertical cross-sectional view in Figure 2.
The BOP stack 3 is installed on the spider beam 8 in the moonpool 6 at the center of the drilling well of the oil drilling barge as shown by the dashed line 3' using the mobile crane 5 provided on the substructure 2, and then The upper BOP stack 4, which had been stored in the same position, was integrated into the lower BOP stack 3' installed in the moon pool 6 as shown by the dashed line 4' using the mobile crane 5 in the same manner as described above.

As mentioned above, the upper and lower BOP stacks 4,
3 was integrated into the moonpool 6 in order to lower the height of the substructure 2 and lower the center of gravity of the oil drilling barge as a whole.

However, in the conventional method, the upper BOP stack 4 and the lower BOP stack 3 are installed on an oil drilling barge in a state where they are separated and assembled at the center of the wellbore during use. Doing this at sea in poor conditions and within a limited time was not only extremely dangerous, but also took a long time to assemble.

Therefore, the present invention was devised to solve the above-mentioned conventional problems, and is suitable for use on oil drilling barges.
The purpose is to prevent danger during BOP stack assembly work and to shorten the assembly time.

That is, the BOP stack transfer device for an oil drilling barge of the present invention moves the BOP stack, in which the upper and lower parts are integrated, from the storage position provided on the oil drilling barge to the drilling site of the oil drilling barge. A removable moving device was installed on the skid rail extending from the moon pool at the center of the wellbore, and a BOP was relocated on the skid rail mentioned above.
It is constructed by providing a traversing device which allows the stack to be moved onto the spider beam in the moon pool.

With reference to the drawings below, the oil drilling barge of the present invention will be constructed.
An example of a BOP stack transfer device will be described.
The same parts as in the conventional example of FIGS. 1 and 2 are indicated by the same part numbers.

First, on the test stamp 9 at the storage position on the deck 1 of the oil drilling barge of this embodiment shown in the plan view of FIG. 3, the longitudinal sectional view of FIG. 4, and the cross sectional view of FIG. Stack 3 and upper BOP stack 4
are pre-assembled and installed.

In addition, a moon pool 6 is provided at the center of the drilling well of the oil drilling barge, and this moon pool 6 is
As shown in FIG. 3, the borehole is extended from the center of the well to the lower position of the structure 10, and skid rails 7 are installed on both sides of the extended moon pool 6 to connect the two test stamps 9. is placed towards the center of the

Next, on the structure 10 provided on the two test stamps 9, the upper and lower BOP stacks 4 and 3, which are integrally assembled, are laid down from the test stamp 9 to the lower center position of the structure 10. A mobile crane 5, which is a moving device that can be moved to a lower position than the skid rail 7, is provided, and the upper and lower BOP stacks 3' and 4', which have been moved onto the skid rail 7, are moved to a lower position than the lower BOP stack. The protrusions 11 provided on both sides of 3 ride on the skid rail 7, and the lower part
The lower side of BOP stack 3 is immersed into moon pool 6. In that position, the upper and lower BOP stacks 3' and 4' are connected to the deck 1 as shown in Figure 5.
As a result, the upper part of the
The head of the BOP stack 4' is positioned at a height below the lower surface of the substructure 2, and is then mounted on a spider beam 8 provided in the moonpool 6 using a suitable cross-feeding device such as a cylinder or winch (not shown). As shown in FIG.
They are installed on the spider beam 8 at a lower position of the substructure 2 as shown by dashed-dotted lines 4' and 3'.

As described above, the upper and lower BOP stacks of the present invention are installed at a position below the structure 10 which is located apart from the substructure 2, and after being lowered from the deck 1 at that position, the upper and lower BOP stacks of the present invention are 2, the height of the substructure 2 can be lowered, and by keeping it lower than the conventional substructure 2 shown in Fig. 2, oil drilling can be carried out. The center of gravity of the barge can be lowered, and the upper and lower parts are integrated.
This makes it easier to install the BOP stacks 4 and 3 from their storage positions to the seabed from the center of the wellbore.

Therefore, in an oil drilling barge employing the BOP transfer device of the present invention, the upper and lower BOP stacks can be installed at a location away from the center of the wellbore, reducing dangerous assembly work on the platform. However, it has the advantage of simplifying the excavation preparation work and shortening the working time.

In addition, by adopting the present invention, the height between the deck and substructure of the oil drilling barge can be lowered, which has the effect of keeping the center of gravity of the entire barge low. be.

[Brief explanation of the drawing]

Fig. 1 is a plan view schematically showing the main parts of a BOP stack transfer device of a conventional oil drilling barge, Fig. 2 is a longitudinal cross-sectional view of Fig. 1, and Fig. 3 is a schematic plan view of a BOP stack transfer device of a conventional oil drilling barge. FIG. 4 is a plan view of the main parts of the BOP stack transfer device; FIG. 4 is a vertical cross-sectional view of FIG. 3;
The figure is a cross-sectional view of FIG. 3. 3, 3'... lower BOP stack, 4, 4'...
Upper BOP stack, 5... Mobile crane, 6
...Moonpool, 7...Skitsdrael, 8...
...Spider Beam, 9...Test stamp.

Claims (1)

[Scope of utility model registration request] Incorporating top and bottom BOP stacks, BOP
A moon pool is provided between the position of the stack moving device and the center of the drilling well, and a skid rail is installed along the moon pool, and the upper and lower BOP stacks are installed, and the moon pool is An oil drilling barge that moves inside along skid rails.
BOP stack transfer device.