JPH0157231B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for seating and fixing a main frame having a function of connecting a fluoroline to a wellhead device fixed to the bottom of the water in an offshore oil production facility.

Conventionally, undersea oil production equipment using this type of underwater operation main frame (hereinafter simply referred to as frame) has been constructed using a guide wire rope C unwound from a tension device B on a work vessel A, as shown in Fig. 1. is wrapped around sheave D, and the sheave D
A guide wire rope C hanging from the main frame E is inserted into a guide member G having a guide cone F, and the wire guide rope C
The lower end of the main frame E is connected to the guide post I fixed to the wellhead device H by diving work, and the main frame E is connected to the wire rope K for suspending the main frame fed out from the lifting winch J on the work boat A. , while guiding the main frame E by the two guide wire ropes C,
After lowering it to the top and fixing it in place, connect the underwater flow line L (containing power supply and crude oil production pipes, etc.) to the wellhead device H, and then connect it via the flow line L and manifold M. It is known that oil can be stored by

However, in the case of this offshore oil production facility, diving work to tension the guide wire rope at great depths becomes extremely difficult, and a device for supporting and tensioning the guide wire rope C is required.
For this reason, there was a problem in that the equipment on the workboat became large, and therefore the workboat also became large.

An object of the present invention is to provide a seating and fixing device that can easily seat and fix a main frame on a wellhead device even in deep water without having to perform the troublesome work of stretching a guide wire rope underwater. The purpose and gist of the present invention is to provide a main frame for underwater operation equipped with a function to connect a flow line, which is suspended from a work boat by a wire rope, immersed in water, and fixed to the bottom of the water. In a submarine oil production facility that is seated and fixed on a wellhead device, a flow line is connected to the wellhead device, and oil is stored via the flowline and manifold, there is a main frame N at the bottom of the wellhead device P. A seating device 5 is provided with a downwardly expanding cylindrical aligning funnel 6 and an impact suction buffer 8 to be fitted, and the seating device 5 is provided at the front of the main frame N to grip a fixing member 12 in the wellhead device P. A clamp device 10 including a pair of clamp members 15 is provided, a balance weight member 25 is provided at the rear of the main frame N so that its position can be adjusted in the longitudinal direction, and thrusters 31 are provided on both left and right sides of the main frame N. A seating and fixing device for a main frame for underwater operation in an offshore oil production facility is provided.

Embodiments of the present invention will be described below based on the drawings.

Figure 2 is a side view showing an outline of an offshore oil production facility using a mainframe according to an embodiment of the present invention;
The figure is an enlarged side view of the main frame, FIG. 4 is a front view of the offshore oil production facility, and FIG. 5 is an enlarged front view of the main frame. In addition, in Figures 2 to 5, N is the main frame, P
is the wellhead equipment and Q is the work boat.

The mainframe N in the present invention will be explained in detail below. One end of a wire rope 3 is connected to the frame body 1 via a hanging device 2, and the other end of the wire rope 3 is wound around a winch 4 fixed on the work boat Q, and the lower part of the frame body 1 is provided with a seating device 5 for seating on a rib 11 provided around the wellhead device P, and this seating device 5 includes an expanding cylindrical alignment funnel 6 that expands downward. , consists of a plurality of shock absorbing buffers 8 and a plurality of guide posts 9 attached to the upper part of the alignment funnel 6, and a frame 7 that holds the guide posts 9 so as to be movable up and down. A retaining head 42 is provided at the upper end, the frame 7 is fixed to the lower part of the frame body 1 via a connecting member, and the buffer 8 faces the lower surface of the frame 7.

A clamping device 1 for fixing the main frame N by clamping a fixing member 12 of the wellhead device P to the front side, that is, the front part of the main frame N.
0, and this clamp device 10 includes a pair of clamp members 15 that can be opened and closed, which are pivotally connected to a frame 13 by a horizontal shaft 14, and a clamp opening and closing cylinder 16 that connects the clamp members 15 and the frame 13. It is made up of. Further, one end of the wire rope 17 for raising and lowering the frame is connected to the frame 13, and the middle part of the wire rope 17 is wound around a support pulley 18 attached to the frame body 1.
The other end is connected to a piston rod of a clamp lifting/lowering cylinder 19 attached to the frame body 1.

A weight balance adjustment device 20 is disposed on the back side, that is, at the rear of the main frame N, and this weight balance adjustment device 20 includes a balance weight member 25 having a built-in weight 24 made of a heavy object such as water or scrap metal, and a balance weight member 25 fixed thereto. It is comprised of a bracket 23, a plurality of position adjustment pin holes 21 provided in the frame body 1, and a stop pin 22 that is removably inserted across the bracket 23 and the pin holes 21.

A guide rail 29 extending in the front-rear direction is fixed to the rear lower part of the frame body 1, and a pair of support members 28 are fixed to the balance weight member 25.
A guide roller 41 is attached to the upper end, and the guide roller 41 is placed on the flange of the guide rail 29, and the moving wire rope 26 is moved by a plurality of lever drive devices 30 equipped with winding drums. The wire rope 26 is wound around a large number of guide sheaves 27 attached to the frame body 1, and its wire rope 26 is connected to the bracket 23.

To adjust the position of the balance weight member 25, remove the stop pin 22 and operate the lever type drive device 30 to move the balance weight member 25 to the guide rail 29 and guide roller 41.
The bracket 23 is moved to an appropriate position while being guided by the bracket 23, and then the bracket 23 is connected to the frame body 1 again by the stop pin 22.

Note that as a means for moving the balance weight member 25, any means other than those shown in the drawings may be employed.

A lateral position adjustment thruster 31 consisting of a hydraulic motor 32 and a propeller 33 rotated by the hydraulic motor 32
are mounted and fixed on both left and right sides of the frame 7, and the orientation and inclination of the main frame N are corrected by the thruster 31 and the weight balance adjustment device 20.

An upper part of a telescoping guide member 34 for preventing shaking and lateral displacement is fixed to the frame body 1, and a lower part of the guide member 34 is connected to the frame 13. A twist correction key 35 is fixed at the rear, and an alignment funnel 6 at the bottom of the main frame N.
A twist correction guide 36 that expands downward is provided at the rear part of the twist correction guide 36 .

As shown in FIG. 8, a clamping cylinder 37 is pivotally mounted at multiple locations around the alignment funnel 6, and one end of a substantially triangular holding member 38 is pivotally mounted by a horizontal shaft 40. A presser roller 43 is attached to the other end of the presser member 38, and a piston rod of a clamp cylinder 37 is connected to an intermediate portion of the presser member 38.

Note that the press roller 43 may be omitted. The fixing member 12 is also provided with an insertion hole into which the tip of the flow line is inserted and a flow line locking device (not shown).

Next, an example of operation of the automatic seating and fixing device of the above embodiment will be explained.

First, before the main frame N is immersed in water, the overall weight balance of the main frame N is adjusted by operating the lever type drive device 30 as described above, and then the balance weight member 25 is attached to the frame body 1 by the stop pin 22. Fixed against.

Next, after confirming the position of the wellhead device P using a sensor (not shown), the winch 4 of the work boat Q is operated in the lowering direction to cause the main frame N to submerge into the water. At that time, the state of the main frame 2 changes depending on conditions such as underwater buoyancy, degree of waves, water pressure, etc., so the thruster 31 is operated to prevent the main frame N from tilting or twisting in the horizontal direction. By turning, advancing, and retreating the main frame N, the longitudinal inclination or horizontal twist of the main frame N in the water is corrected.

When the main frame N is further lowered, the alignment funnel 6 of the main frame N hits the rib 11 of the wellhead device P, and in this case, the alignment funnel 6
Since the impact received by
It engages with the rib 11 of.

When the main frame N is further lowered, the alignment funnel 6 is guided by a conical portion formed by a large number of ribs 11 around the wellhead device P, and the misalignment is corrected as shown in FIGS. 6 and 7.
As shown in the figure, the key 35 of the wellhead device P comes into contact with the twist correction guide 36 at the rear of the alignment funnel 6, and while the twist is corrected, the alignment funnel 6 is completely placed on the rib 11. Take a seat.

The alignment funnel 6 of the main frame N is the rib 11
After fully seated on the top, as shown in Figure 8,
By extending the clamping cylinder 37 attached around the alignment funnel 6, the holding member 38 pivotally attached to the alignment funnel 6 is rotated and engaged with the lower surface of the circular flange 39 in the wellhead device P. At the same time, the alignment funnel 6 is fixed to the wellhead device P.

Next, by extending the clamp elevating cylinder 19, the frame 13 and the part supported by it are gradually lowered, and the pair of open clamp members 15 are moved to the upper part of the fixing member 12 in the wellhead device P. Then, by extending the clamp opening/closing cylinder 16, each clamp member 15 grips and fixes the fixing member 12.

According to this invention, the balance weight member 25
The longitudinal inclination of the main frame N can be easily corrected by adjusting the longitudinal position of the main frame N, and the orientation and longitudinal inclination of the main frame N can be easily corrected by operating the thruster 31. When the main frame N is lowered toward the wellhead device P, the downwardly expanding cylindrical alignment funnel 6 is fitted into the wellhead device P by induction, so that the main frame N is moved toward the wellhead device P. It can be easily seated in a predetermined position, and when the main frame N is seated on the wellhead device P, the impact acting on the alignment funnel 6 is absorbed by the impact absorbing buffer 8, so that a large impact force is not applied to the main frame N. can be prevented from acting. After the main frame N is seated on the wellhead device P, the fixing member 1 of the wellhead device P is
2, the main frame N can be fixed to the wellhead device P, and furthermore, by remotely controlling the clamp device 10, thruster 31, etc., diving work and guide wire rope tensioning work can be completely eliminated. Since it becomes unnecessary and there is no need to provide a wire rope tensioning device on the work boat, effects such as the ability to downsize the work boat can be obtained.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of a conventional submarine oil production facility. 2 to 8 show embodiments of the present invention, in which FIG. 2 is a side view showing the structure of the main frame and the relationship between the main frame and the wellhead device in the present invention, and FIG. FIG. 4 is an enlarged side view of the main frame; FIG. 4 is a front view showing the structure of the main frame and the relationship between the main frame and the wellhead device;
The figure is an enlarged front view of the main frame, Figure 6 is a plan view showing the state of contact between the twist correction guide of the alignment funnel and the key of the wellhead device, and Figure 7 shows the state of contact between the twist correction guide and the key. The front view and FIG. 8 are side views showing the state in which the alignment funnel and the circular flange of the wellhead device are fixed. In the figure, N is the main frame, P is the wellhead equipment, Q is the work boat, 1 is the frame body, 3 is the wire rope, 4 is the winch, 5 is the seating device, 6 is the alignment funnel, 7 is the frame, and 8 is the buffer. , 9 is a guide post, 10 is a clamp device, 12 is a fixing member, 13 is a frame, 15 is a clamp member, 16
1 is a cylinder for opening and closing the clamp, 19 is a cylinder for lifting and lowering the clamp, 20 is a weight balance adjustment device, 21
2 is a position adjustment pin hole, 22 is a stop pin, 25 is a balance weight member, 31 is a thruster for lateral position adjustment, 35 is a twist correction key, 36 is a twist correction guide, 37 is a clamp cylinder, and 38 is a presser foot. It is a member.

Claims (1)

[Claims] 1. A main frame for underwater operation equipped with the function of connecting a flow line is suspended from a work boat using a wire rope, submerged in water, and seated and fixed on a wellhead device fixed to the bottom of the water, and the flowline is connected to the wellhead device. In a submarine oil production facility in which oil is connected and stored via its flow line and manifold, a downwardly expanding cylindrical alignment funnel 6 fitted to a wellhead device P and an impact are installed at the bottom of a main frame N. A seating device 5 comprising an absorption buffer 8 is provided, and a clamp device 10 comprising a pair of clamp members 15 for gripping a fixing member 12 in the wellhead device P is provided at the front of the main frame N. A balance weight member 25 is provided at the rear of the main frame N so that its position can be adjusted in the longitudinal direction, and thrusters 31 are provided on both left and right sides of the main frame N. For underwater operation in submarine oil production equipment. Main frame seating fixing device.