CN203705257U - Flange tensioning device for marine riser testboard - Google Patents

Abstract

The utility model discloses a flange tensioning device of a water riser test bench, which relates to a flange tension device of a water riser test bench for oil and gas offshore drilling. A flange tightening device is provided for making the stress state of the riser flange close to its actual stress state when the water riser is tested. The flange tensioning device of the riser test bench includes a riser flange and a plugging flange. The riser flange and the plugging flange are connected by a tensioning device. The tensioning device includes a tensioning bolt, a tensioning nut, a driving device, The driving device mounting seat and the torque sleeve; the tension bolt and the tension nut together form a threaded connection mechanism to connect the riser flange and the sealing flange; the driving device is connected to the sealing flange through the driving device mounting seat; the torque sleeve drives The device is connected, and a nut hole is arranged in the sleeve, and the tension nut is located in the nut hole and can slide along the nut hole. The utility model can be used in the plugging operation of the end face of the water riser during the water riser test.

Description

Riser test bench flange tensioning device

technical field

The utility model relates to a flange tensioning device, in particular to a flange tensioning device of a water riser test bench for oil and gas offshore drilling.

Background technique

When drilling in the sea, it is necessary to install a riser between the subsea wellhead and the offshore drilling platform to establish a channel for mud to return from the subsea wellhead to the offshore drilling platform. The riser is actually a high-pressure pipe bundle. Along with the main riser, there are five high-pressure pipelines with different diameters and different pressure bearings, including well killing, hydraulic pressure, mud pressurization, and throttling. The structure is complex; It bears complex and variable loads such as self-weight, ocean current impact force, tension force, mud pressure, hydraulic pressure, etc., and the working conditions are harsh. Therefore, offshore drilling operations have extremely high safety requirements for riser assemblies, and each riser assembly unit must be factory inspected with a riser test device to test its tensile, compressive strength and connection tightness.

In order to complete the performance testing test of the riser bundle unit for the riser test device, the flanges at both ends of the riser bundle unit must be closed with plugging flanges to form a closed space for pressure testing. Since the inside of the pipe body will bear a large hydraulic pressure during the test, there are high requirements for the performance of the flange connection mechanism.

The existing riser test benches at home and abroad all use clamps to connect the sealing flange and the riser flange, but the actual riser flanges are connected by uniformly distributed axial bolts, so the clamp connection will cause the riser The stress state of the flange is not consistent with its actual stress state, and the structure of the clamp connection mechanism is complex and bulky, and the maneuverability is poor.

In order to solve the problem that the stress state of the riser flange is inconsistent with the actual stress state during the test of the flange connector of the existing riser test bench, and to simplify the structure of the test bench, the connection between the riser flange and the plugging flange The mechanism should be as close as possible to the flange connection mode of the riser when it is actually working.

Utility model content

The technical problem to be solved by the utility model is: to provide a riser that makes the stress state of the flange of the riser as close as possible to its actual stress state when testing the riser, has a simple structure and a high degree of connection automation Test bench flange tensioning device.

The technical solution adopted to solve the above problems is: the flange tensioning device of the riser test bench includes a riser flange and a plugging flange, the riser flange and the plugging flange are connected by a tensioning device, and the tensioning device includes a tensioning device Tightening bolts, tensioning nuts, driving devices, driving device installation seats and torque sleeves; the tensioning bolts and tensioning nuts together form a threaded connection mechanism to connect the riser flange and the plugging flange; the driving device is connected to the Plugging the flange connection; the torque sleeve includes a sleeve body and a sleeve base, the sleeve base is connected to the driving device, a nut hole with a cross-sectional shape corresponding to the shape of the tension nut is arranged in the sleeve body, and the tension nut is located on the nut hole and can slide along the nut hole.

Further, a sleeve hole is arranged in the mounting seat of the driving device, and a semicircular groove is arranged on the hole wall of the sleeve hole; the torque sleeve is located in the sleeve hole, and a semicircular groove is arranged on the outer surface of the torque sleeve; The semicircular grooves on the torque sleeve correspond to the positions of the semicircular grooves and jointly form a ball groove, which is filled with balls.

Further, a spring is arranged between the tension nut and the sleeve base.

Further, the flange tensioning device of the riser test bench includes a plug, the mounting seat of the driving device is provided with a ball hole communicating with the ball groove, and the plug is connected with the mounting seat of the driving device to close the ball hole.

Further, the flange tensioning device of the riser test bench includes locking steel balls, small springs and pressure caps with steel ball holes. The tension bolts are provided with locking holes, the small springs are located in the locking holes, and the pressure caps Connect with the tension bolt and make the locking steel ball compress the small spring, a part of the locking steel ball protrudes from the surface of the pressure cap through the steel ball hole; a limit groove is set on the flange of the riser, and the locking steel ball protrudes out of the pressure cap Some are located in the limit groove.

Further, the tension bolt includes a bolt head and a bolt shank, the shape of the bolt head is cylindrical or conical, and there is a distance between the axis of the bolt head and the axis of the bolt shank; the bolt hole of the riser flange is in contact with the surface of the bolt head and the bolt shank .

The beneficial effect of the utility model is that: the riser flange and the sealing flange are connected by tension bolts, the acceptance of the riser flange is consistent with the actual work, and the structure is simpler than the clamp connection. The torque sleeve is driven by the driving device, and then the tension nut is driven to rotate and tighten, so that the connection operation between the riser flange and the plugging flange has a high degree of automation.

Description of drawings:

Figure 1 is a structural diagram of the flange tensioning device of the riser test bench;

Figure 2 is a structural diagram when the riser flange and the plugging flange are separated;

Figure 3 is an enlarged view of the locking steel ball;

Fig. 4 is a structural diagram of tension bolts;

The marks in the figure are: tension bolt 1, ball hole 2, tension nut 3, sleeve hole 4, torque sleeve 5, plug 6, ball 7, driving device mounting seat 8, driving device 9, sleeve base 10 , spring 11, sleeve body 12, ball groove 13, plugging flange 14, riser flange 15, bolt hole 16, pressure cap 17, locking steel ball 18, steel ball hole 19, locking hole 20, small Spring 21, bolt head 22, bolt rod 23.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is further described.

The flange tensioning device of the riser test bench includes a riser flange 15 and a plugging flange 14, the riser flange 15 and the plugging flange 14 are connected by a tensioning device, and the tensioning device includes a tensioning bolt 1, a tensioning Nut 3, driving device 9, driving device mounting seat 8 and torque sleeve 5; tension bolt 1 and tension nut 3 jointly form a threaded connection mechanism to connect riser flange 15 and plugging flange 14; driving device 9 drives The device mounting seat 8 is connected with the plugging flange 14; the torque sleeve 5 includes a sleeve body 12 and a sleeve base 10, the sleeve base 10 is connected with the driving device 9, and the sleeve body 12 is provided with cross-sectional shape and tension The shape of the nut 3 corresponds to the nut hole, and the tension nut 6 is located in the nut hole and can slide along the nut hole. Drive unit 9 can select stepper motor for use, also can select pneumatic device for use. Tightening nut 3 can select common hexagonal nut for use.

The tension bolt 1 is used to connect the riser flange 15 and the plugging flange 14. The stress on the riser flange 15 is consistent with the actual work, and the structure is simpler than the clamp connection. The torque sleeve 5 is driven by the driving device 9, and then the tension nut 3 is driven to rotate and fasten, so that the connection operation between the riser flange 15 and the plugging flange 14 has a high degree of automation.

In order to prevent the torque sleeve 5 from swinging, a sleeve hole 4 is arranged in the mounting seat 8 of the driving device, and a semicircular groove is arranged on the hole wall of the sleeve hole 4; the torque sleeve 5 is located in the sleeve hole 4, and the torque sleeve 5 is The surface is provided with a semicircular groove; the semicircular groove on the sleeve hole 4 corresponds to the semicircular groove on the torque sleeve 5 and together form a ball groove 13, which is filled with balls 7. The drive device mount 8 limits the swing of the torque sleeve 5 . The torque sleeve 5, the driving device mounting seat 8 and the ball 7 jointly form a rolling bearing structure, which reduces the frictional force of the relative rotation between the torque sleeve 5 and the driving device mounting seat 8. Install rolling bearings between them to save space. It is recommended to arrange two rows of ball grooves 13 and balls 7 at intervals.

In order to facilitate the tension nut 3 to be screwed into the tension bolt 1 , a spring 11 is arranged between the tension nut 3 and the sleeve base 10 . The elastic force of the spring 11 pushes the tension nut 3 to the tension bolt 1, so that the tension nut 3 is screwed into the tension bolt 1.

In order to facilitate the loading of balls into the ball groove 13, the flange tensioning device of the riser test bench includes a plug 6, and a ball hole 2 communicating with the ball groove 13 is arranged on the driving device mounting seat 8, and the plugging 6 is connected to the driving device mounting seat 8. Connect and close the ball hole 2. The ball 7 is loaded into the ball groove 13 through the ball hole 2, and then the plug 6 is connected to the drive device mounting seat 8 to close the ball hole 2, so as to prevent the ball 7 from falling out.

When the tension nut 3 is screwed into the tension bolt 1, the thrust of the spring 11 will cause the tension bolt 1 to move outward, and it is necessary to provide a force to prevent the tension bolt 1 from moving outward so that the tension nut 3 can be screwed into the tension bolt 1. Tighten bolt 1. It is possible to artificially apply a thrust to the tension bolt 1, but the operation is very inconvenient. The recommended method of the utility model is as follows: the flange tensioning device of the riser test bench includes a locking steel ball 18, a small spring 21 and a pressure spring with a steel ball hole 19. The cap 17 is provided with a locking hole 20 on the tightening bolt 1, and the small spring 21 is located in the locking hole 20. The pressing cap 17 is connected with the tightening bolt 1 and makes the locking steel ball 18 compress the small spring 21, and the locking steel ball A part of 18 protrudes from the surface of the pressure cap 17 through the steel ball hole 19; a limit groove is provided on the riser flange 15, and the part of the locking steel ball 18 protruding from the pressure cap 17 is located in the limit groove. The tension bolt 1 is prevented from moving outward by the limiting effect of the locking steel ball 18 . The separated state of the riser flange 15 and the plugging flange 14 is shown in Figure 2. The locking steel ball 18 can also prevent the tension bolt 1 from falling out of the riser flange when the riser flange 15 and the plugging flange 14 are separated. 15.

During the process of screwing the tension nut 3 into the tension bolt 1, obviously the tension bolt 1 cannot rotate. There are many ways to prevent the tension bolt 1 from rotating. For example, the head of the tension bolt 1 is a hexagonal head, and a hexagonal hole is made on the riser flange 15, and the head of the tension bolt 1 is put into the hole. The hexagonal hole processing is troublesome, so the utility model adopts the following method: the tension bolt 1 includes a bolt head 22 and a bolt shank 23, the bolt head 22 is in the shape of a cylinder or a cone, and there is a gap between the bolt head 22 axis and the bolt shank 23 axis. Distance (that is, eccentricity); the bolt hole 16 of the riser flange 15 is in contact with the surface of the bolt head 22 and the bolt shaft 23 . The tension bolt 1 is prevented from rotating by the eccentricity of the bolt head 22 and the bolt shaft 23, and the bolt hole 16 is circular or conical, which is convenient for processing.

The operation mode of the utility model is as follows: when in use, first make the sealing flange 14 close to the riser flange 15 in the process of tightening and sealing; make the tightening bolt 1 insert the sealing flange 14, and withstand the tightening nut 3 , compress the spring 11, when the sealing flange 14 is close to the riser flange 15, start the driving device 9, drive the tension nut 3 to rotate through the torque sleeve 5, because the spring 11 presses the tension nut 3 against the tension bolt 1 On the screw thread, when the tension nut 3 rotates, the tension bolt 1 is screwed in until the tension nut 3 is pressed against the sealing flange 14, and when the tightening torque on the tension nut 3 reaches the rated value, the driving device 9 shuts down, thereby Realize the sealing of the end face of the riser.

Claims (6)

1. marine riser testing table flange take-up device, comprise marine riser flange (15) and shutoff flange (14), marine riser flange (15) is connected by take-up device with shutoff flange (14), it is characterized in that: take-up device comprises tightening screw (1), tightening nut (3), drive unit (9), drive unit mount pad (8) and moment of torsion sleeve (5); Tightening screw (1) jointly forms threaded connection with tightening nut (3) and is connected marine riser flange (15) and shutoff flange (14); Drive unit (9) is connected with shutoff flange (14) by drive unit mount pad (8); Moment of torsion sleeve (5) comprises sleeve body (12) and sleeve base (10), sleeve base (10) is connected with drive unit (9), in sleeve body (12), be provided with the nut bore that shape of cross section is corresponding with tightening nut (3) shape, tightening nut (6) is positioned at nut bore and can slides along nut bore.

2. marine riser testing table flange take-up device according to claim 1, is characterized in that: in drive unit mount pad (8), be provided with sleeve hole (4), on the hole wall of sleeve hole (4), be provided with half slot; Moment of torsion sleeve (5) is positioned at sleeve hole (4), and moment of torsion sleeve (5) outside surface is provided with half slot; Corresponding and the common ball grooves (13) that forms in half slot position on half slot on sleeve hole (4) and moment of torsion sleeve (5), is filled with ball (7) in ball grooves (13).

3. marine riser testing table flange take-up device according to claim 2, is characterized in that: between tightening nut (3) and sleeve base (10), be provided with spring (11).

4. marine riser testing table flange take-up device according to claim 3, it is characterized in that: comprise shutoff (6), on drive unit mount pad (8), be provided with the ball hole (2) being communicated with ball grooves (13), shutoff (6) is connected with drive unit mount pad (8) and seals ball hole (2).

5. according to the marine riser testing table flange take-up device described in claim 1 to 4 any one, it is characterized in that: comprise the pressure cap (17) of locking steel ball (18), little spring (21) and thering are steel ball hole (19), on tightening screw (1), be provided with locking hole (20), little spring (21) is positioned at locking hole (20), pressure cap (17) is connected with tightening screw (1) and makes to lock steel ball (18) compression little spring (21), and a part for locking steel ball (18) is protruded pressure cap (17) surface by steel ball hole (19); Marine riser flange is provided with stopper slot on (15), and the part that locking steel ball (18) protrudes pressure cap (17) is positioned at stopper slot.

6. according to the marine riser testing table flange take-up device described in claim 1 to 4 any one, it is characterized in that: tightening screw (1) comprises bolt head (22) and body of bolt (23), bolt head (22) is shaped as cylinder or taper shape, between bolt head (22) axis and body of bolt (23) axis, has distance; The bolt hole (16) of marine riser flange (15) and bolt head (22) and the laminating of body of bolt (23) surface.