CN213265513U - Device is transferred to semi-submerged formula workover platform umbilical cable - Google Patents

Abstract

A device for lowering umbilical cables of a semi-submersible workover platform comprises a derrick and a deck room, wherein a deck roof is arranged at the top of the deck room, a front end guider is arranged at one end, close to the derrick, of the deck roof, the front end guider is provided with a base, the base is fixed at the deck roof through screws, and a supporting plate and rollers are fixed on the base. The fixed pulley is fixed at the top of the derrick, the drill floor guider is arranged on the hatch cover on one side of the wellhead, the umbilical cable sequentially penetrates through the front end guider, the fixed pulley and the drill floor guider, the umbilical cable between the front end guider and the fixed pulley is sleeved with the cable guider, the cable guider is provided with a plurality of pulleys, and the lower end of the cable guider is connected with the balancing weight through the horseshoe buckle. The umbilical cable tension monitoring and releasing device has the advantages that the umbilical cable tension monitoring and releasing device is simple in composition and very practical, compared with a traditional mode, the umbilical cable releasing and rolling device does not need to be provided with an umbilical cable lowering and rolling vehicle with umbilical cable tension monitoring and releasing compensation functions, only a conventional rolling vehicle is needed, and cost can be greatly saved.

Description

Device is transferred to semi-submerged formula workover platform umbilical cable

Technical Field

The invention relates to the field of ocean engineering, in particular to an umbilical cable lowering device used in a semi-submersible well repairing platform of ocean engineering.

Background

When the semi-submersible workover platform works, the operations of key valves and switches of the underwater oil production equipment are usually completed on a control console of the overwater semi-submersible workover platform. The control console is in signal connection with the underwater valve and the switch through the umbilical cable, so that the umbilical cable and the underwater oil production equipment are required to be placed to the seabed together during operation.

Due to the space limitation of a platform drilling area, the umbilical cable winding drum cannot be directly arranged at a wellhead to lower the umbilical cable, the umbilical cable winding drum needs to be arranged elsewhere, and then is guided to the underwater in a pulley mode and connected with the underwater oil production equipment.

Due to the action of wind wave flow, the semi-submersible workover platform can continuously move forwards and backwards, leftwards and rightwards (roll and pitch) and ascend and descend (heave) at sea during operation, and underwater oil extraction equipment is heavy and has large inertia. Therefore, the well workover platform can pull the umbilical when moving or rising, and if the problem that the platform pulls the umbilical is not well handled, damage or even breakage of the umbilical can be caused.

In order to avoid the damage phenomenon of the umbilical cable in the operation process, enough length must be considered when the umbilical cable lowering device is designed to compensate the sudden change of the length of the umbilical cable caused by the self movement of the workover platform. The umbilical cable of the conventional semi-submersible workover platform is lowered for operation, the umbilical cable needs to be stored on a winch with active wave compensation, a corresponding pulley block is arranged between the umbilical cable and a wellhead, and the umbilical cable can be lowered to the underwater together with a drill rod and a marine riser nearby during operation. The lowering mode needs the umbilical cable reel to have the functions of monitoring the tension of the umbilical cable and releasing compensation, the cost is very high, and meanwhile, the requirement on the reliability of an umbilical cable reel compensation system is very high. Once the compensation function of the device fails, the umbilical cable can be worn or broken, the operation progress is influenced, even the device is shut down, and huge economic loss is caused.

Disclosure of Invention

In order to solve the problems, the invention provides a semi-submersible type well workover platform umbilical cable lowering device, aiming at ensuring the safety of the umbilical cable lowering process and preventing the umbilical cable from being broken due to pulling and the like, and the adopted technical scheme is as follows:

the utility model provides a device is transferred to semi-submerged formula workover platform umbilical cable, has the derrick of vertical setting in the well head top, erects on the deck and is provided with the deck room, the derrick with there is the interval in the deck room, deck roof portion is provided with deck roof, the umbilical cable reel has been placed at deck roof, the winding has the umbilical cable on the umbilical cable reel, deck roof is close to derrick one end is provided with the front end director, the front end director has the base, the base passes through the fix with screw deck roof, be fixed with backup pad and gyro wheel on the base, the backup pad both ends are provided with special-shaped baffle, the baffle with the backup pad is mutually perpendicular. The roller and the supporting plate are arranged between the baffle plates in parallel.

The derrick top is fixed with the fixed pulley, is equipped with the rig floor director on the hatch board of well head one side, the umbilical cable passes in proper order the front end director the fixed pulley the rig floor director, the front end director the cover is equipped with the fairlead on the umbilical between the fixed pulley, the fairlead has the arc main part, the arc main part comprises two arcs, and equidistant being fixed with a plurality of pulleys between two arcs, the pulley is along with the trend of arc main part sets up, arc main part lower extreme is connected with the balancing weight through the buckle of a hoof.

The front end guider is used for changing the trend of the umbilical cable and avoiding the abrasion of a hull structure to the umbilical cable, and the position and the number of the front end guider need to be configured according to the actual condition of the semi-submersible platform. The compensation cable guide device has the function of ensuring that when the semi-submersible workover platform moves and rises and sinks due to the influence of wind, wave and flow, the preset umbilical cable compensation amount can meet the requirement of free expansion of the umbilical cable, and the problem that the umbilical cable is damaged due to pulling can not occur.

The compensation amount of the umbilical cable between the derrick and the deck room needs to be reserved, namely, the umbilical cable at the section needs to be reserved with extra length, the preset umbilical cable compensation amount is calculated according to the motion response analysis of the semi-submersible workover platform, and the weight of a balancing weight on the compensation cable guide needs to be determined according to the unit length weight of the umbilical cable and the umbilical cable compensation amount so as to ensure the safe placement of the umbilical cable. The fixed pulley is fixed at the height of the derrick and the like and is used for changing the direction of the umbilical cable.

One of the characteristics of the semi-submersible workover platform is that a hydraulic drive movable hatch cover is arranged at the center of a wellhead of a main deck and is used for transporting and supporting equipment such as a Christmas tree. The drill floor guider is fixed on the hatch cover, so that the umbilical cable can be ensured to be smoothly transferred when the hatch cover moves to any position.

Above-mentioned device is transferred to semi-submerged formula workover platform umbilical cable, further, the baffle top is the arc, the backup pad is three, the gyro wheel is two, three the backup pad tip line is triangle-shaped and sets up, two the gyro wheel tip line with the base sets up perpendicularly. The connecting line of the roller and the supporting plate forms an arc shape which is matched with the top of the baffle plate and is matched with the baffle plate to guide the trend of the umbilical cable. The umbilical cable is attached to the roller and the supporting plate, so that smooth winding and unwinding of the umbilical cable are guaranteed.

Above-mentioned device is transferred to semi-submerged formula workover platform umbilical, further ground, the cable guide cover is established on the umbilical, the pulley with the umbilical contacts. The fairlead can slide over the umbilical via a pulley.

Above-mentioned device is transferred to semi-submerged formula workover platform umbilical cable, further, the fixed pulley setting position is higher than the front end director. The fixed pulley sets up in the eminence, can effectively mention the umbilical, guarantees that the fairlead can stop on the umbilical between fixed pulley and the front end director.

Above-mentioned semi-submersible workover platform umbilical cable transfer device, further ground, the umbilical cable reel is placed at the main deck. The umbilical cable reel is placed on the main deck more firmly, and the use is more convenient.

Above-mentioned device is transferred to semi-submersible workover platform umbilical cable, further on, backup pad and gyro wheel parallel arrangement. The rollers and the supporting plate are arranged between the baffles in parallel, the rollers play a role in guiding the umbilical cables, the supporting plate plays a role in supporting the umbilical cables, and the rollers are arranged at the front ends of the supporting plates.

The weight of the balancing weight can be calculated according to the following steps:

1. establishing a finite element model of the semi-submersible workover platform;

2. carrying out motion response analysis on the semi-submersible well repairing platform;

3. obtaining maximum heave, roll and pitch values in the operation process of the semi-submersible workover platform according to the corresponding analysis result of the motion;

4. determining the length compensation amount of the umbilical cable according to the maximum heave, roll and pitch values in the operation process of the semi-submersible workover platform;

5. and determining the weight of a balancing weight in the passive compensation cable guide according to the weight of the single length of the umbilical cable, the length compensation amount of the umbilical cable and a certain safety factor.

The device has the advantages that the composition is simple, but the device is very practical, compared with the traditional mode, the device does not need to be provided with an umbilical cable lowering reel car with umbilical cable tension monitoring and releasing compensation functions, only needs a conventional reel car, and can greatly save the cost; meanwhile, the compensation function of the device does not depend on precise monitoring equipment and complex release compensation equipment, but is a simple physical method, and the device is more reliable. Reliability is critical to marine platforms operating at vast, in-the-vast, sea, both safely and economically.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the fairlead configuration of the present invention;

FIG. 3 is a schematic view of the front end guide of the present invention;

wherein: 1-derrick, 2-deckhouse, 3-deckhouse top, 4-front end guider, 5-cable guider, 6-umbilical cable, 7-fixed pulley, 8-drill floor guider, 9-base, 10-supporting plate, 11-roller, 12-baffle, 13-arc main body, 14-pulley and 15-counterweight block.

Detailed Description

The invention is further explained by combining the attached drawings, and the umbilical cable lowering device of the semi-submersible type workover platform shown in figure 1 comprises a derrick 1 vertically arranged above a wellhead, a deck chamber 2 is vertically arranged beside the derrick on a deck, a gap exists between the deck chamber and the derrick, a deck chamber top 3 is arranged at the top of the deck chamber, an umbilical cable reel is arranged at the deck chamber top, and an umbilical cable 6 is wound on the umbilical cable reel.

One end of the deck roof close to the derrick is provided with a front end guider (as shown in figure 3) 4, the front end guider is provided with a base 9, the base is fixed at one end of the deck roof close to the derrick through screws, the base is fixed with 3 supporting plates 10 and 2 idler wheels 11, the supporting plates and the idler wheels are arranged in parallel, two ends of the supporting plates and the idler wheels are provided with special-shaped baffles 12, the tops of the baffles are provided with arcs, and the baffles are vertical to the supporting plates. The 2 gyro wheels are vertical to be set up side by side, and the tip line of 2 gyro wheels is mutually perpendicular with the base, and the tip line of 3 backup pads is triangle-shaped (the structural position relation of backup pad and gyro wheel is not shown in the picture), and the line of backup pad and gyro wheel is identical with baffle top arc, and umbilical cable laminating backup pad and gyro wheel, backup pad and gyro wheel cooperate, guide umbilical cable's trend.

Be fixed with fixed pulley 7 at the derrick top, be equipped with drill floor director 8 on the hatch board of well head one side, the umbilical cable passes front end director, fixed pulley, drill floor director in proper order, the front end director the cover is equipped with fairlead (as shown in fig. 2) 5 on the umbilical cable between the fixed pulley, the fairlead has arc main part 13, the arc main part comprises two arcs, and equidistant being fixed with a plurality of pulleys 14 between two arcs, the pulley along with the trend of arc main part sets up, arc main part lower extreme is buckled through the hoof and is connected with balancing weight 15. The umbilical cable between the front end guider and the derrick is provided with compensation amount, the bottom of the umbilical cable at the section is arc-shaped and is attached to the shape of the cable guider, and the umbilical cable is attached to the shape of the cable guider.

As shown in figure 1, when the umbilical cable is pulled and pulled, the umbilical cable is ensured to have enough allowance and not to be pulled off, and the safety of the lowering process of the umbilical cable is further ensured.

The device has the advantages that the composition is simple, but the device is very practical, compared with the traditional mode, the device does not need to be provided with an umbilical cable lowering reel car with umbilical cable tension monitoring and releasing compensation functions, only needs a conventional reel car, and can greatly save the cost; meanwhile, the compensation function of the device does not depend on precise monitoring equipment and complex release compensation equipment, but is a simple physical method, and the device is more reliable. Reliability is critical to marine platforms operating at vast, in-the-vast, sea, both safely and economically.

Claims (6)

1. The utility model provides a device is transferred to semi-submerged formula workover platform umbilical cable has vertical setting derrick (1) in the well head top, its characterized in that: a deck chamber (2) is vertically arranged on a deck, the derrick and the deck chamber are spaced, a deck roof (3) is arranged at the top of the deck chamber, an umbilical cable reel is placed on the deck roof, an umbilical cable (6) is wound on the umbilical cable reel, a front end guider (4) is arranged at one end, close to the derrick, of the deck roof, the front end guider is provided with a base (9), the base is fixed at the deck roof through screws, a supporting plate (10) and rollers (11) are fixed on the base, special-shaped baffles (12) are arranged at two ends of the supporting plate, and the baffles are perpendicular to the supporting plate;

derrick top is fixed with fixed pulley (7), is equipped with drill floor director (8) on the hatch board of well head one side, the umbilical passes in proper order the front end director the fixed pulley drill floor director, the front end director the cover is equipped with fairlead (5) on the umbilical between the fixed pulley, fairlead has arc main part (13), the arc main part comprises two arcs, and equidistant being fixed with a plurality of pulleys (14) between two arcs, the pulley is along with the trend of arc main part sets up, arc main part lower extreme is connected with balancing weight (15) through the buckle of a hoof.

2. The umbilical lowering apparatus of a semi-submersible workover platform as recited in claim 1 wherein: the top of the baffle is arc-shaped, the number of the supporting plates is three, the number of the rollers is two, the connecting line of the end parts of the three supporting plates is triangular, and the connecting line of the end parts of the two rollers is perpendicular to the base.

3. The umbilical lowering apparatus of a semi-submersible workover platform as recited in claim 1 wherein: the cable guider is sleeved on the umbilical cable, and the pulley is in contact with the umbilical cable.

4. The umbilical lowering apparatus of a semi-submersible workover platform as recited in claim 1 wherein: the fixed pulley is arranged at a position higher than the front end guider.

5. The umbilical lowering apparatus of a semi-submersible workover platform as recited in claim 1 wherein: the umbilical reel is placed on the main deck.

6. The umbilical lowering apparatus of a semi-submersible workover platform as recited in claim 1 wherein: the supporting plate and the roller are arranged in parallel.

Images