CN111058782A

CN111058782A - Chuck for hanging marine riser

Info

Publication number: CN111058782A
Application number: CN201910948215.9A
Authority: CN
Inventors: 何鑫; 毛良杰
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2019-10-08
Filing date: 2019-10-08
Publication date: 2020-04-24

Abstract

The invention discloses a chuck for hanging a marine riser, which mainly comprises a bearing disc, a gear ring, a top cover, a servo motor and a control system, wherein the gear ring is sleeved on the periphery of the bearing disc, a bearing is arranged between the gear ring and the bearing disc, and four pairs of supporting seats are arranged on the upper surface of the bearing disc and are uniformly distributed in an annular shape; a clamping jaw assembly is arranged between each pair of supporting seats, and comprises a hydraulic cylinder, a pressure sensor and a stress conversion device inside the hydraulic cylinder; four pairs of pins are embedded on the inner wall of the gear ring and distributed in a cross shape, and a servo motor is arranged beside the gear ring; and the control system receives the signal of the pressure sensor and controls the action of the servo motor. The invention has the advantages that: a stress conversion device is arranged in the jaw, and the stress of the front contact surface of the jaw is dynamically detected; and control system control gear ring is rotatory, can insert the position of pin and adjusting pin automatically, prevents that the marine riser from taking place local deformation because of the skew, guarantees the integrality of marine riser, improves the efficiency and the security of operation.

Description

Chuck for hanging marine riser

Technical Field

The invention belongs to the field of offshore oil drilling and production equipment, and particularly relates to a suspended riser chuck.

Background

The chuck is important lifting equipment for offshore drilling, and the installation, the disassembly, the support and the suspension of the marine riser all need the matching of the chuck device. The common chuck forms are mainly a pedal claw type, a door type and a telescopic arm type.

The jaw chuck was a product of 20 actual 70 s, and it adopts a four-pedal structure, requiring human operation. When the pedal is put down, the four supporting surfaces are in contact with the marine riser street, so that the functions of installing, disassembling, supporting and hanging the marine riser system are implemented; when the pedal is erected, the dysmenorrhea in the chuck is smooth, and the lower part can be used for searching the marine riser system. However, the chuck is manual, and the lifting working efficiency of the marine riser is affected. The door-type chuck realizes operations such as transfer, support, installation of marine riser through the action of opening and shutting of china east cardboard, and outstanding advantage is simple structure, but the unsettled length of during operation is longer, and bearing capacity is poor, and door-type chuck volume weight is great, and the production price difficulty is many, the cost is higher. The telescopic arm chuck, although somewhat reducing the disadvantages of both chucks, does not take into account the contact stress between the riser and the jaws.

During drilling, when the drilling platform predicts a typhoon, if the riser is not to be recovered, the riser is suspended by a chuck to lift off the traveling path of the typhoon. The marine riser is difficult to avoid deflecting due to the action of wind, waves and flow in the towing process, the chuck is generally in rigid connection with the marine riser, local contact stress is overlarge due to long-term connection, the marine riser can be locally deformed, normal operation is influenced, and great potential safety hazards exist.

Disclosure of Invention

The invention discloses a chuck for hanging a marine riser, which aims to indirectly measure the contact stress of a clamping jaw and the marine riser, dynamically control the direction of an elastic limit pin by using a detected signal, offset the local stress increased by the offset of the marine riser by using the deformation of the elastic limit pin, and improve the problem of local sunken deformation of the marine riser possibly caused by the local stress concentration of the common clamping jaw on the marine riser so as to improve the safety of the marine riser in the towing process.

The invention aims to realize the purpose by the following scheme that the chuck for the suspended marine riser comprises a bearing disc, a gear ring, a bearing, a top cover, a servo motor, a hydraulic cylinder, a supporting seat, a jaw, a pressure sensor, a limit pin, a control box, a transmission screw and a signal cable, wherein the outer edge of the lower bearing disc is buckled with the axis gear ring, the bearing is arranged between the bearing disc and the gear ring to ensure that the gear ring can rotate around the central shaft of the lower bearing disc, the upper surface of the bearing disc is provided with four pairs of supporting seats through rivets, the four lifting rings are welded on the upper surface of the bearing disc, the middle parts of the opposite surfaces of each pair of supporting seats are provided with sliding grooves, the tail ends deviating from the circle center are provided with arc clamping grooves, the hydraulic cylinder arranged between each pair of supporting seats is arranged on the lower bearing disc, the hydraulic cylinder is connected with a hydraulic power source through, wherein the middle part is protruding for passing the depression bar tail end, passes the cover on the depression bar and has right the ring, passes the depression bar front end and is equipped with the sealing ring, and the cover has the sealing washer on the sealing ring and is carved with the clearance, and the cavity afterbody has arranged and has passed the pressure hole, and it has sealed lid to pass the depression bar afterbody, and surface mounting has pressure sensor on the jack catch to through cable junction control box and servo motor, arranged the top cap on four pairs of supporting seat upper portions.

Specifically, the gear ring is movably connected with the lower bearing disc through a bearing and movably connected with the servo motor through a transmission screw rod.

Specifically, the supporting seats are arranged in pairs and distributed on the upper surface of the bearing plate in a cross shape, a sliding groove is formed in the middle of each supporting seat, and an arc-shaped clamping groove is formed in the tail end of each supporting seat.

Specifically, a pressure sensor is fixedly connected in the pressure transmission hole.

Specifically, the control box receives signals of the pressure sensor through electric connection and converts the signals into electric signals to control the servo motor to act.

Specifically, 3 pairs of the limiting pins are rigid, and one pair of the limiting pins are elastic and are uniformly embedded on the inner wall of the gear ring in an annular mode.

The invention has the following advantages:

according to the invention, the front end of the clamping jaw is arranged to be arc-shaped, so that the contact area between the clamping jaw and the marine riser is increased, and the contact stress between the marine riser and the clamping jaw is reduced.

According to the invention, the stress conversion device is designed at the front end of the clamping jaw, so that the contact stress between the clamping jaw and the marine riser can be measured.

The invention controls the position of the elastic limit pin through dynamic detection of contact stress and follow-up control, reduces the possibility of deformation of the marine riser due to stress concentration, and ensures that the marine riser is safer to use and has longer service life.

The servo motor drives the gear to rotate through screw transmission, and has the functions of large torque and reverse rotation prevention.

Drawings

Fig. 1 is a partial cross-sectional view of the present invention.

Fig. 2 is a top perspective view of the invention in an operational condition with the cap removed.

FIG. 3 is a top perspective view of the invention in its inoperative condition with the lid removed.

Fig. 4 is a cross-sectional view of the jaws of fig. 1.

In the figure: 1-bearing disc, 2-gear ring, 3-bearing, 4-top cover, 5-servo motor, 6-hydraulic cylinder, 7-supporting seat, 8-clamping jaw, 9-pressure sensor, 10-cylindrical cavity, 11-pressure transmission rod, 12-righting ring, 13-sealing cover, 14-sealing ring, 15-sealing ring, 16-pressure transmission hole, 17-hydraulic telescopic rod cavity, 18-rigid pin, 19-elastic pin, 20-transmission screw, 21-cable, 22-control cabinet and 23-lifting ring.

Detailed Description

The invention will be further described with reference to the accompanying drawings, but the scope of the invention is not limited to the following.

As shown in fig. 1 and 3, a suspended riser chuck is characterized in that: comprises a bearing disc (1), a gear ring (2), a bearing (3), a top cover (4), a servo motor (5), a hydraulic cylinder (6), a supporting seat (7), a clamping jaw (8), a pressure sensor (9), a cylindrical cavity (10), a pressure transmission rod (11), a righting ring (12), a sealing cover (13), a sealing ring (14), a sealing ring (15), a pressure transmission hole (16), a hydraulic telescopic rod cavity (17), a rigid pin (18), an elastic pin (19), a transmission screw (20), a cable (21), a control cabinet (22) and a lifting ring (23), wherein the outer edge of the bearing disc (1) is movably connected with the gear ring (2), the bearing (3) is arranged between the bearing disc (1) and the gear ring (2) to ensure that the gear ring (2) can rotate around the central shaft of the lower bearing disc (1), so that the pin on the inner wall is positioned in a clamping groove at the rear end of the supporting seat, so as to limit the movement of the claw (8) and keep the claw stable; four pairs of supporting seats (7) are arranged on the upper surface of the bearing disc (1) through rivets, the supporting seats (7) are arranged on the upper surface of the lower supporting plate (1) in a cross shape, sliding grooves are formed in the middle of the opposite surfaces of each pair of supporting seats, and arc-shaped clamping grooves are formed in the tail ends of the supporting seats, which are deviated from the circle center; a hydraulic cylinder (6) is arranged on the lower bearing disc between each pair of supporting seats, the hydraulic cylinder is connected with a hydraulic power source through a quick joint and is matched with a telescopic rod cavity (17) below the clamping jaw through a telescopic rod to push the clamping jaw (8) to extend and retract; a claw (8) is embedded in a middle sliding groove of the paired supporting seats (7), the front end of the claw (8) is arc-shaped, three spherical protrusions are arranged on the surface of the arc-shaped, and a stress conversion device is formed by the middle spherical protrusion (11) and the claw (8); as shown in fig. 4, the stress conversion device is composed of a pressure transmission rod (11) and a cylindrical cavity (10) inside the jaw, the front end of the pressure transmission rod (11) is fixedly connected with a sealing ring (14), the tail end of the pressure transmission rod is righted by a righting ring (12) and sealed by a sealing cover (13), the bottom of the cylindrical cavity (10) is provided with a pressure transmission hole (16), and a pressure sensor (9) is installed in the pressure transmission hole; as shown in fig. 2, the effect is at the stress of pressure transmission pole (11) afterbody, convert the inside oil pressure of cavity through pressure transmission pole (11), pressure sensor (9) are through detecting the indirect measurement contact stress of oil pressure, and pass signal transmission control box (22) through cable (21), control box (22) convert the signal of obtaining into the signal of telecommunication of drive servo motor (5), servo motor (5) promote gear (2) rotation through driving screw (20), send corresponding position to elasticity spacing pin (19), in order to offset the additional stress that increases the marine riser skew and bring, it drops ring (23) to weld four between four pairs of supporting seats, be used for the installation to move the chuck, top cap (4) have been arranged on four pairs of supporting seat upper portions, be used for bearing the staff.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Those skilled in the art can make numerous possible variations and modifications to the described embodiments, or modify equivalent embodiments, without departing from the scope of the invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technology of the present invention are within the protection scope of the present invention, unless the content of the technical solution of the present invention is departed from.

Claims

1. A suspension riser chuck, characterized in that: it comprises a lower bearing plate (1), a gear ring (2), a bearing (3), a top cover (4), a servo motor (5), a hydraulic cylinder (6) , support seat (7), clamping jaw (8), pressure sensor (9), inner cylindrical cavity of clamping jaw (10), pressure transmission rod (11), centralizing ring (12), sealing cover (13), sealing ring (14), sealing ring (15), pressure transmission hole (16), hydraulic telescopic rod cavity (17), rigid pin (18), elastic pin (19), drive screw (20), cable (21), control cabinet (22), the lifting ring (23) is characterized in that: the outer edge of the bearing plate (1) is movably connected with the gear ring (2), and a bearing (2) is installed between the bearing plate (1) and the gear ring (2). 3), four pairs of support seats (7) are installed on the upper surface of the carrier plate (1) through rivets and four lift-off rings (23) are welded, and the support seats (7) and lift-off rings (23) form a "cross". Symmetrical arrangement; a hydraulic cylinder (6) is installed on the carrier plate (1) in the middle of each pair of support seats (7), and a claw assembly is embedded in the middle chute of the pair of support seats (7). It comprises a clamping claw (8), a pressure transmission rod (11), a cylindrical cavity (10) inside the clamping claw, a centralizing ring (12), a sealing ring (14), and a pressure transmission hole (16); the cable (21) is connected to control A box (22), a pressure sensor (9) and a drive servo motor (5); the servo motor (5) is installed on both sides of the gear ring (2), and the pins (18) (19) are embedded in the inner wall of the gear ring (2).

2. A hanging riser chuck according to claim 1, characterized in that: the support seats (7) are arranged in pairs, and are distributed on the upper surface of the bearing plate (1) in a "cross" shape, and the support seats (7) are arranged in pairs. There is a chute in the middle and an arc slot at the end.

3. A suspension riser chuck according to claim 1, characterized in that: the front end of the claw (8) is arc-shaped, and the arc-shaped surface is embedded with three evenly distributed protrusions, and the center protrusion is It is the pressure transmission rod (11).

4. A suspension riser chuck according to claim 1, characterized in that: there are pressure transmission rods (11) and pressure transmission holes (16) in the inner cylindrical cavity (10) of the jaws, and the pressure transmission A centralizing ring (12) and a sealing ring (14) are sleeved on the rod (11), and a sealing cover (13) is installed at the rear end.

5 . The suspension riser chuck according to claim 1 , wherein a drive screw ( 20 ) is installed at the front end of the servo motor ( 5 ). 6 .

6 . The hanging riser chuck according to claim 1 , wherein a cable is connected between the pressure sensor ( 9 ), the control cabinet ( 22 ) and the servo motor ( 22 ). 7 .

7. A hanging riser chuck according to claim 1, characterized in that: the lifting ring (23) is semicircular, welded on the upper surface of the bearing plate (1), and its height is lower than where the pin is located level.