A device for the deflection of a cantilever of an offshore drilling rig

 

(57) Abstract:

The invention is intended for use in hydraulic construction, in particular, relates to a means for the development of the continental shelf, namely, devices for moving the cantilever (retractable console) located therein drilling complex offshore drilling rig. A device for the deflection of a cantilever of an offshore drilling rig the slider is mounted in the lower part of the cantilever and made in the form of interconnected cheeks, and lugs made in the form of symmetrical relative to the Central axis of the slide levers and provided with balancers to change their position. By placing the slider at the bottom of the cantilever and constructive implementation of its reduced metal parts, providing the movement of the cantilever. 2 C.p. f-crystals, 3 ill.

The invention relates to the field of hydraulic engineering construction, in particular to the means for the development of the continental shelf, namely, devices for moving the cantilever (retractable console) located therein drilling complex offshore drilling rig.

Famous sea drilling rig with a cantilever and a device for the m known the specified device is the design complexity and the difficulties in its operation.

It is also known a device for the deflection of a cantilever of an offshore drilling rig that contains the supplied hydraulic power cylinders of the slide with mounted on it stops made by protrusions that interact with the notches in the lower part of the cantilever (see drawing N 1540.027.423 "the moving Device, a sliding console" CDB "Corall" 29.05.91 - prototype).

In the mentioned known device, the slider is mounted on the deck of the drilling rig and has special guides for their oriented movement during the movement of the rod of the hydraulic cylinder.

The disadvantage of the prototype is its low efficiency and the increased complexity and intensity. This is reflected in the fact that only part of the efforts of the cylinders is useful work (moving the cantilever), and some movement of the slide in the guides, and the distribution of forces is such that up to 20% of the effort of the cylinders is spent on overcoming the reactive force which presses against the guide rails.

The technical result of the invention is to improve the efficiency and simplify the design of the device.

This is achieved in a device for the deflection of a cantilever of an offshore drilling rig, containing Sodeistvie with cutouts in the lower part of the cantilever, the fact that the slider is mounted in the lower part of the cantilever and made in the form of interconnected cheeks, and lugs made in the form of symmetrical relative to the Central axis of the slide levers and provided with balancers to change their position.

This is achieved by the fact that the cheeks of the slide is made with grooves for engagement with the underside of the cantilever.

In addition, it is also achieved by the fact that the cheeks of the slide are connected by tie-rods and rockers installed on one of the couplers.

The invention is illustrated in the drawing, where Fig. 1 shows the stern of the offshore drilling rig with cantilever and drilling complex and a General view of the inventive device of Fig. 2 is a view of the Fig. 1; Fig. 3 - view of B in Fig. 2.

The device for moving the cantilever 1 with drilling complex 2 offshore drilling rig 3 is provided with a hydraulic power cylinders 4 slide 5 with mounted on it stops 6, made with the tabs 7 that communicate with openings 8 in the lower part of the cantilever 1.

The slide 5 is mounted in the lower part of the cantilever 1 and made in the form of interconnected ties 9 cheeks 10. To communicate with the lower part of the cantilever 1 cheeks 10 Polzunov and provided with balancers 13 to change their position. The beams 13 are installed on one of the tie-rods 9. Case 4 cylinders mounted on the support 14 of the cantilever 1, and the rod 15 through axle 12 are connected with the lugs 6.

The device operates as follows.

When moving the cantilever 1 balancers 13 stops 6 is installed in the position corresponding to the direction of movement. When the flow of the operating fluid in the hydraulic cylinders 4 their rods 15 commit stroke, moving through lugs 6 of the cantilever 1 in the stroke of the hydraulic cylinder 4. However cheeks 10 supporting lugs 6, fixed with respect to the cantilever 1 and move during the stroke with him. During idling of the cylinders 4, the protrusions 7 stops 6 disengage from the notches 8 in the lower part of the cantilever 1 and slide on its lower surface, until no "will penetrate deeply in the following cutouts 7, moving relative to the cantilever 1 with jaws 10.

The cycle is repeated the necessary number of times and can be stopped at any stage.

To change the direction of movement of the cantilever 1 balancers 13 is switched to the reverse position, changing the direction of overturning moment acting on the lugs 6.

The position of the stops 6 pauleena device fixed part of the metal parts (sliders, guides for them), and, most importantly, during the stroke of the cylinders all their power is spent only on useful work, i.e., the movement of the cantilever.

1. A device for the deflection of a cantilever of an offshore drilling rig that contains the supplied hydraulic power cylinders of the slide with mounted on it stops made by protrusions that interact with the notches in the lower part of the cantilever, wherein the slider is mounted in the lower part of the cantilever and made in the form of interconnected cheeks, and lugs made in the form of symmetrical relative to the Central axis of the slide levers and provided with balancers to change their position.

2. The device under item 1, characterized in that the cheeks of the slide is made with grooves for engagement with the underside of the cantilever.

3. The device under item 1, characterized in that the cheeks of the slide are connected by tie-rods and rockers installed on one of the couplers.

 

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