CN107643218B - Wellhead connector large-load tension-compression bending test experimental device and method - Google Patents

Wellhead connector large-load tension-compression bending test experimental device and method Download PDF

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CN107643218B
CN107643218B CN201710811757.2A CN201710811757A CN107643218B CN 107643218 B CN107643218 B CN 107643218B CN 201710811757 A CN201710811757 A CN 201710811757A CN 107643218 B CN107643218 B CN 107643218B
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hinge
hydraulic cylinder
load
shaped steel
hydraulic
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CN107643218A (en
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秦桦
程子云
赵宏林
李福明
吴世德
段梦兰
叶天源
安晨
张玉
熊泽华
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CHONGQING QIANWEI TECHNOLOGY GROUP Co Ltd
China University of Petroleum Beijing CUPB
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CHONGQING QIANWEI TECHNOLOGY GROUP Co Ltd
China University of Petroleum Beijing CUPB
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Abstract

The invention relates to a wellhead connector large-load tension-compression bending test experimental device and an experimental method, which are characterized in that: the device comprises an auxiliary tool system, a hinge force amplifying structure system, a hydraulic power loading system, an input data acquisition and analysis system and an output data acquisition and analysis system; the auxiliary tool system is arranged on the existing wellhead connector system; the hinge force amplification structure system is connected with the auxiliary tool system and provides output load for the auxiliary tool system; the hydraulic power loading system is connected with the hinge force amplification structure system and provides input load for the hinge force amplification structure; the input data acquisition and analysis system is arranged on the hinge force amplification structure system and acquires strain force on the hinge force amplification structure as actual input load; the output data acquisition and analysis system is arranged on the wellhead connector system, and strain force in the wellhead connector system is acquired as actual output load. The invention can be widely applied to the technical field of underwater oil and gas exploitation.

Description

Wellhead connector large-load tension-compression bending test experimental device and method
Technical Field
The invention relates to the technical field of underwater oil and gas exploitation, in particular to a wellhead connector large-load tension-compression bending test experimental device and an experimental method.
Background
The subsea tree is an oil production system consisting of valves, pipelines, connectors and accessories, which are placed on a subsea wellhead at the seabed, and the wellhead connector of the subsea tree is an important part of the subsea tree, which can connect subsea production facilities such as the subsea tree to the subsea wellhead, realize the sealing of the junction between the subsea tree and the subsea wellhead, prevent oil and gas leakage, and bear internal and external loads. The wellhead connector and the underwater Christmas tree are generally connected through special trapezoidal threads, and the special trapezoidal threads have good bearing capacity. However, the swinging or vibration of pipelines and the like in the subsea tree under the action of ocean currents can cause the wellhead connector to be subjected to a large load action including tension and bending, so that the wellhead connector can still work well under the action of the large load tension and bending, and the method is a necessary guarantee for safe and reliable production of the subsea production system including the subsea tree, and therefore, the large load test of the wellhead connector to observe the performance of the wellhead connector is very important.
At present, a large number of comprehensive tensile-compression-bending experimental devices exist in China, and a multifunctional testing machine platform assembly provided by Chinese patent document 200520029374.2 can be added with various auxiliary devices on a platform for realizing multiple material and structure tests under four loads of tensile-compression-bending-torsion, but the experimental device cannot take the errors of components into consideration. Chinese patent document 201420622826.7 discloses a mechanical experimental apparatus capable of performing various experiments such as a bending normal stress measurement of a beam, a buckling combined deformation experiment, an internal force measurement experiment of a truss, an internal force measurement of a statically determinate structure, and an internal force measurement of a statically indeterminate structure. Moreover, at present, no simple and economic experimental device for carrying out large-load experiments on wellhead connectors and similar mechanisms exists at home and abroad. Besides, the tensile-compression bending experimental device in the prior art has the following defects:
1. when carrying out different experiments, need make different experimental apparatus usually, increased the expense of experiment place and experiment, reduced experimental efficiency.
2. When a large-load experiment is carried out, a large input load is needed to complete a task, the requirement on a load input system is high, and the experiment cost is increased.
3. The existing tension-compression bending experimental device only considers the deformation measurement of a tested piece in the aspect of measurement and does not consider whether the input load meets the requirement or not.
Disclosure of Invention
In view of the above problems, the present invention aims to provide an experimental device and an experimental method for a wellhead connector high-load tension-compression bending test, which can perform a high-load tension-compression bending test on a wellhead connector and similar mechanisms, have the characteristics of low load input and high load output, and are convenient to install and dismantle.
In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a well head connector heavy load draws bending test experimental apparatus which characterized in that: the device comprises an auxiliary tool system, a hinge force amplifying structure system, a hydraulic power loading system, an input data acquisition and analysis system and an output data acquisition and analysis system; the auxiliary tool system is arranged on the existing wellhead connector system; the hinge force amplification structure system is connected with the auxiliary tool system and provides output load for the auxiliary tool system; the hydraulic power loading system is connected with the hinge force amplification structure system and provides input load for the hinge force amplification structure; the input data acquisition and analysis system is arranged on the hinge force amplification structure system and is used for acquiring strain force on the hinge force amplification structure as actual input load; the output data acquisition and analysis system is arranged on the wellhead connector system and used for acquiring strain force in the wellhead connector system as actual output load.
The auxiliary tool system comprises an upper I-shaped steel frame, an upper I-shaped steel frame connecting assembly, a connecting welding plate, a lower I-shaped steel frame connecting assembly, a mounting clamp, a lower I-shaped steel frame fixing block and two hydraulic cylinder supporting systems symmetrically arranged on two sides of the lower I-shaped steel frame; two ends of the upper I-shaped steel frame are connected with the hinge force amplification structure system through the upper I-shaped steel connecting assembly, and the bottom of the upper I-shaped steel frame is connected with the upper part of the wellhead connector system through the connecting welding plate; the two ends of the lower I-shaped steel frame are connected with the hinge force amplification structure system through the lower I-shaped steel connecting assembly, the upper part of the lower I-shaped steel frame is connected with the lower part of the wellhead connector system through the mounting clamp, and the lower part of the lower I-shaped steel frame is fixed on the ground through the lower I-shaped steel frame fixing block; the bottom of the two hydraulic cylinder bases is fixedly arranged on the ground on two sides of the lower I-shaped steel frame through the hydraulic cylinder base cushion plates respectively, and the top of the two hydraulic cylinder bases is connected with the two hydraulic cylinder upper cover plates through bolts respectively.
The upper I-shaped steel frame connecting assembly comprises a welding groove plate, two irregular cushion blocks, a plurality of regular cushion blocks and two lug plates, wherein a plurality of clamping grooves are formed in the two surfaces of the welding groove plate; one side of the surface of each of the two welding groove plates, which is provided with a clamping groove, is connected with the upper I-shaped steel frame through a bolt, the two irregular cushion blocks are inserted between the two straight notches on the outer side surface of the upper I-shaped steel frame and the welding groove plates, and the upper surfaces of the irregular cushion blocks are matched with the outer side surface of the upper I-shaped steel frame; the regular cushion blocks are inserted between other straight notches of the upper I-shaped steel frame and the welding groove plate; the two lug plates are connected with the two welding groove plates through bolts, and the other side of the surface of the lug plates is provided with a mounting hole for connecting with the hinge force amplification structure system; i-shaped steel shelf coupling assembling includes two welding otic placodes, two the welding otic placode welds respectively I-shaped steel shelf both ends down, and two the welding otic placode surface be provided with a plurality of be used for with the mounting hole of hinge power amplification structure headtotail.
The two hydraulic cylinder supporting systems respectively comprise a hydraulic cylinder base, a hydraulic cylinder base cushion plate with variable height and a hydraulic cylinder upper cover plate; two the bottom of pneumatic cylinder base is respectively through two pneumatic cylinder base backing plate symmetry sets up the subaerial of I-shaped steel shelf both sides down, two the top of pneumatic cylinder base is bolted connection two respectively the pneumatic cylinder upper cover plate, and two pneumatic cylinder base top is provided with the three chamber that leads to that is used for placing the pneumatic cylinder, two pneumatic cylinder upper cover plate lower surface is provided with and should leads to chamber assorted recess.
The hinge force amplification structure system comprises two hinge force amplification structures which are symmetrically arranged, and each hinge force amplification structure comprises three transverse rods which are arranged side by side and two pairs of hinges which are arranged between the transverse rods at intervals; the transverse rods are hinged with the end parts of the two pairs of hinges through a middle pin, and the included angles between the upper hinge and the lower hinge of the two pairs of hinges and the transverse rods are the same; the other end of each transverse rod is hinged with the hydraulic power loading system through a small pin, and the other end of each pair of upper and lower hinges of each pair of hinges is hinged with an ear plate and a welding ear plate in the upper and lower I-shaped steel frame assemblies of the auxiliary tool system through a middle pin.
The hydraulic power loading system comprises a plurality of hydraulic cylinders and a hydraulic control system; each hydraulic cylinder is arranged in two hydraulic cylinder bases on two sides of the auxiliary tool system respectively, and one end of each hydraulic cylinder is connected with each transverse rod in the hinge force amplifying structure system through a small pin; the end surface of the other end is fixed by the hydraulic cylinder base and the inner surface of the hydraulic cylinder upper cover plate; the hydraulic control system comprises a stepping motor controller and a hydraulic circuit assembly with a pump; the stepping motor controller is connected with each hydraulic cylinder through a signal wire and used for providing control signals for each hydraulic cylinder; the pump-containing hydraulic circuit assembly is connected with each hydraulic cylinder and the hydraulic pump station and used for providing hydraulic pressure for each hydraulic cylinder.
The input data acquisition and analysis system comprises a plurality of transverse rod tension and compression strain gauges, a plurality of hinge tension and compression strain gauges and a first static resistance strain gauge; the transverse rod tension and compression strain gauges are arranged on the upper surface of each transverse rod of the hinge force amplification structure system, and the hinge tension and compression strain gauges are arranged on the upper surface of the upper hinge and the lower surface of the lower hinge of each pair of hinges of the hinge force amplification structure; and the transverse rod tension and compression strain gauges and the hinge tension and compression strain gauges are connected through a lead to form a measuring bridge and then are connected with the first static resistance strain gauge, so that the strain force on each transverse rod and each hinge is acquired in real time.
The output data acquisition and analysis system comprises a connector axial strain gauge, a connector radial strain gauge and a second static resistance meter; the connector axial strain gage disposed on a connector body in the uphole connector system, the connector radial strain gage disposed on a center ring in the uphole connector system; and the axial strain gauge of the connector and the radial strain gauge of the connector are connected through a lead to form a measuring bridge and then are connected with the second static resistance strain gauge to acquire the strain force of the wellhead connector system in real time.
A wellhead connector large-load tension-compression bending test experimental method adopting the device is characterized by comprising the following steps: 1) well head connector systems are connected with the auxiliary tool system, the hinge force amplification structure system and the hydraulic power loading system respectively; 2) respectively installing an input data acquisition and analysis system and an output data acquisition and analysis system on the hinge force amplification structure system and the wellhead connector system; 3) obtaining an output load calculation value of the hydraulic cylinder according to the required load required by the experiment and the initial power multiplying amplification coefficient of the hinge power amplification structure system; 4) the hydraulic control system sends control signals to the hydraulic cylinders on the two sides according to the obtained output load calculation value to carry out a tension, compression and bending load test experiment; 5) analyzing stress data acquired by an acquisition system and an output load calculation value of a hydraulic cylinder according to input and output data to obtain various error values under the load; 6) and on the premise of keeping the output load of the hydraulic cylinder unchanged, changing the power amplification coefficient of the hinge power amplification structure system, repeating the steps 4-5), and observing the mechanical behavior of the wellhead connector system under different output loads.
In the step 4), the hydraulic control system sends a control signal to the hydraulic cylinders on the two sides according to the obtained output load calculation value, and the method for carrying out the tension, compression and bending load test experiment comprises the following steps: when the tensile load experiment was performed: the left hydraulic cylinder is controlled to move rightwards and the right hydraulic cylinder is controlled to move leftwards by a hydraulic control system and a stepper motor controller; when the pressure load test was performed: after the trial operation, the left hydraulic cylinder is controlled to move leftwards and the right hydraulic cylinder is controlled to move rightwards by the hydraulic control system and the stepping motor controller; when the bending load experiment was performed: and the left hydraulic cylinder is controlled to move leftwards and the right hydraulic cylinder is controlled to move rightwards by a hydraulic control system and a stepping motor controller.
Due to the adoption of the technical scheme, the invention has the following advantages: 1. the invention can amplify the input load by 20 times due to the arrangement of the hinge force amplification structure system, and can change the force multiplication amplification coefficient by changing the length of the hinge and the included angle in the horizontal direction, thereby reducing the output load requirement on the hydraulic cylinder and meeting various load requirements of a tension-compression bending test experiment. 2. The auxiliary tool system is hinged with the experimental object, so that the auxiliary tool system is convenient to disassemble, when different experimental objects are required to be subjected to tension-compression bending experiments, the auxiliary tool system is only required to be lifted, the transition device is used for simulating a wellhead to be twisted down, and then different transition devices are used according to different tested pieces. 3. According to the invention, as the welding groove plate is arranged in the upper I-shaped steel connecting assembly, the welding groove plate is adjusted up and down by adjusting the structures and the heights of the regular cushion block and the irregular cushion block, so that the installation error and the manufacturing error of a hinge and the like can be eliminated, and the correct installation is ensured. 4. The length of the hinge in the hinge force amplifying structure and the height of the cushion block at the bottom of the hydraulic cylinder are adjustable, different requirements on a large-load tension-compression bending experiment of a wellhead connector or a similar mechanism are met, and the hinge force amplifying structure is wide in application range. 5. The experimental device has the advantages of simple structure, reasonable design, small occupied space, higher repeated utilization rate, low load input and large load output, economy and applicability, and better guidance effect on production sites.
Drawings
FIG. 1 is a schematic sectional view of the overall structure of the present invention in a front view;
FIG. 2 is a schematic cross-sectional view of the overall structure from above in accordance with the present invention;
FIG. 3 is a schematic perspective view of a lower I-shaped steel frame and a fixing block according to the present invention;
FIG. 4 is a schematic side view of the lower I-shaped steel frame and the fixing block of the present invention;
FIG. 5 is a schematic view of an assembly structure of a slot plate and an upper I-shaped steel frame according to the present invention;
FIG. 6 is a schematic perspective view of a trough plate according to the present invention;
FIG. 7 is a front view of the trough plate of the present invention;
FIG. 8 is a top view of the trough plate of the present invention;
FIG. 9 is a side view of the trough plate of the present invention;
FIG. 10 is a perspective view of an ear plate according to the present invention;
FIG. 11 is a front view of an ear plate according to the present invention;
FIG. 12 is a schematic view of the hinge force amplifying member of the present invention;
fig. 13 is a front view of the hinge force amplifying member of fig. 12.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
As shown in fig. 1 to 5, the wellhead connector large-load tension-compression bending test experimental device provided by the invention comprises an auxiliary tool system, a hinge force amplification structure system, a hydraulic power loading system, an input data acquisition and analysis system and an output data acquisition and analysis system; the hinge force amplification structure system is connected with the auxiliary tool system to provide output load for the auxiliary tool system; the hydraulic power loading system is connected with the hinge force amplification structure system and provides input load for the hinge force amplification structure; the input data acquisition and analysis system is arranged on the hinge force amplification structure system and acquires strain force on the hinge force amplification structure as actual input load; the output data acquisition and analysis system is arranged on the wellhead connector system, and strain force in the wellhead connector system is acquired as actual output load.
The wellhead connector system comprises a simulation tree body 1, a Christmas tree testing pile 2, a connector body 3, a support ring 4, a center ring 5, a locking block 6 and a drive ring 7. Wherein, simulation tree body 1 sets up in production tree test pile 2 upper portions, and both pass through connector body 3 sealing connection. The upper part of the connector body 3 is fixedly connected with the lower part of the simulation tree body 1, and the lower part of the connector body 3 is fixedly connected with the upper part of a central ring 5 sleeved outside the Christmas tree test pile 2 through a support ring 4. A plurality of locking pieces 6 are arranged in the cavity of the connector body 3 at intervals, and each locking piece 6 is connected with the outer wall of the Christmas tree testing pile 2 through internal threads. The connector body 3 is externally sleeved with a driving ring 7, and the connector body 3 and the driving ring 7 are in inclined surface contact and used for moving up and down under the driving of hydraulic pressure to push the locking block 6 to be clamped in/out of a thread groove of the Christmas tree testing pile 2 so as to lock/unlock a wellhead and equipment above the wellhead.
The auxiliary tool system comprises an upper I-shaped steel frame 8, a connecting welding plate 9, a lower I-shaped steel frame 10, a mounting clamp 11, a lower I-shaped steel frame fixing block 12, an upper I-shaped steel frame connecting assembly, a lower I-shaped steel frame connecting assembly and hydraulic cylinder supporting systems symmetrically arranged on two sides of the lower I-shaped steel frame 10. The two ends of the upper I-steel frame 8 are connected with the hinge force amplification structure system through the upper I-steel connecting assembly, and the bottom of the upper I-steel frame 8 is connected with the simulation tree body 1 on the upper portion of the wellhead connector system through a welded connecting welding plate 9. The two ends of the lower H-shaped steel frame 10 are connected with the hinge force amplification structure system through lower H-shaped steel connecting assemblies, the upper portion of the lower H-shaped steel frame 10 is connected with the lower portion of the Christmas tree testing pile 2 at the lower portion of the wellhead connector system through a mounting fixture 11, and the lower portion of the lower H-shaped steel frame 10 is fixed on the ground through a lower H-shaped steel frame fixing block 12.
Both hydraulic cylinder support systems comprise a hydraulic cylinder base 13, a height-variable hydraulic cylinder base plate 14 and a hydraulic cylinder upper cover plate 15. The bottoms of the two hydraulic cylinder bases 13 are symmetrically arranged on the ground at two sides of the lower I-shaped steel frame 10 through the two hydraulic cylinder base cushion plates 14 respectively, the tops of the two hydraulic cylinder bases 13 are connected with the two hydraulic cylinder upper cover plates 15 through bolts respectively, three through cavities for placing hydraulic cylinders are formed in the tops of the two hydraulic cylinder bases 13, and grooves matched with the through cavities are formed in the lower surfaces of the two hydraulic cylinder upper cover plates 15.
As shown in fig. 6 to 11, the upper i-steel frame connecting assembly includes a welding groove plate 16 having a plurality of grooves on both surfaces thereof, two irregular cushion blocks 17, a plurality of regular cushion blocks 18, and two lug plates 19. One side of the surfaces of the two welding groove plates 16, which is provided with the clamping grooves, is connected with the upper I-shaped steel frame 8 through bolts, the two irregular cushion blocks 17 are inserted between the two straight notches on the outer side surface of the upper I-shaped steel frame 8 and the welding groove plates 16, and the upper surfaces of the irregular cushion blocks 17 are matched with the outer side surface of the upper I-shaped steel frame 8; a plurality of regular cushion blocks 18 are inserted between other straight notches of the upper I-shaped steel frame 8 and the welding groove plates 16. The two lug plates 19 are connected with the two welding groove plates 16 through bolts, and the other sides of the surfaces of the two lug plates 19 are provided with mounting holes for connecting with a hinge force amplification structure system.
The lower I-shaped steel frame connecting assembly comprises two welding lug plates 20, the two welding lug plates 20 are respectively welded at two ends of the lower I-shaped steel frame 10, and a plurality of mounting holes used for being connected with the hinge force amplifying structure system are formed in the surfaces of the two welding lug plates 20.
As shown in fig. 12 and 13, the hinge force amplifying structure system includes two symmetrically arranged hinge force amplifying structures, and each hinge force amplifying structure includes three transverse rods 21 arranged side by side and two pairs of hinges 22 arranged between the transverse rods at intervals. The ends of each transverse bar 21 and two pairs of hinges 22 are hinged by a central pin, and the included angles between the upper and lower hinges of the two pairs of hinges and the transverse bar 21 are the same. The other end of each transverse rod 21 is hinged with a hydraulic power loading system through a small pin, and the other end of the upper hinge and the other end of the lower hinge in each pair of hinges 22 are respectively connected with an ear plate 19 and a welding ear plate 20 in an upper I-shaped steel frame assembly and a lower I-shaped steel frame assembly in an auxiliary tool system through a middle pin.
The hydraulic power loading system includes a plurality of hydraulic cylinders 23 and a hydraulic control system consisting of a stepper motor controller 24 and a pump-containing hydraulic circuit assembly 25. Each hydraulic cylinder 23 is respectively arranged in the hydraulic cylinder base 13 at two sides of the auxiliary tool system, one end of each hydraulic cylinder 23 is connected with the transverse rod 21 in the hinge force amplifying structure system through a small pin, and the end surface of the other end is fixed by the inner surfaces of the hydraulic cylinder base 13 and the hydraulic cylinder upper cover plate 15. The stepping motor controller 24 is connected with each hydraulic cylinder 23 through a signal line and is used for providing control signals for each hydraulic cylinder 23; the pump-containing hydraulic circuit assembly 25 is connected to each hydraulic cylinder 23 and the hydraulic pump station, and is used for providing hydraulic pressure for each hydraulic cylinder 23.
The input data acquisition and analysis system comprises a plurality of transverse rod tension and compression strain gauges 26, a plurality of hinge tension and compression strain gauges 27 and a first static resistance strain gauge 28. A lateral rod tension and compression strain gauge 26 is provided on the upper surface of each lateral rod 21 in the hinge force amplifying structure system, and a hinge tension and compression strain gauge 27 is provided on the upper surface of each upper hinge 22 and the lower surface of the lower hinge 22 in the hinge force amplifying structure system. The transverse rod tension and compression strain gauges 26 and the hinge tension and compression strain gauges 27 are connected through conducting wires to form a measuring bridge and then are connected with a first static resistance strain gauge 28, and strain forces on the transverse rods 21 and the hinges 22 are collected in real time.
The output data acquisition and analysis system comprises a connector axial strain gage 29, a connector radial strain gage 30 and a second static resistance meter 31. A connector axial strain gage 29 is provided on the connector body 3 in the uphole connector system and a connector radial strain gage 30 is provided on the centre ring 5 in the uphole connector system. The axial strain gauge 29 and the radial strain gauge 30 of the connector are connected through conducting wires to form a measuring bridge and then are connected with a second static resistance strain gauge 31, and the axial and radial strain forces of the connector body in the wellhead connector system are collected in real time.
Based on the wellhead connector large-load tension-compression bending test experimental device, the invention also provides a wellhead connector large-load tension-compression bending test experimental method, which comprises the following steps:
1) well head connector system auxiliary fixtures system, hinge power amplification structural system and hydraulic power loading system are installed well respectively.
The installation method comprises the following steps:
① the lower I-shaped steel frame 10 is placed on the ground and fixed on the ground through the mounting holes on the lower I-shaped steel frame fixing block 12.
② the two hydraulic cylinder bases 13 are sequentially placed on the ground at both sides of the lower i-beam frame 10 according to the pre-calculated distance and fixed on the ground through the mounting holes on the hydraulic cylinder base backing plate 14.
③ each cylinder 23 is placed in a through cavity at the top of the two cylinder bases 13 and the cylinder top cover 15 is bolted to the top of the cylinder bases 13.
④ the wellhead connector system is placed between upper and lower I-steel shelves 8, 10, the upper part being secured by a connecting weld plate 9 and the lower part being secured by a mounting clamp 11.
⑤ the cross bars 21 are connected to the hydraulic cylinders 23, the cross bars 21 to the upper and lower hinges 22, the upper hinges 22 to the lugs 19, and the lower hinges 22 to the welding lugs 20 by pins in this order.
⑥ an upper I-beam frame 8 and two welded slot plates 16 are installed, two bolts are respectively installed in each straight slot on two outer side faces of the upper I-beam frame 8, if the welded slot plates 16 are staggered with the straight slots, the welded slot plates 16 need to move up and down for adjustment, and then irregular cushion blocks 17 and regular cushion blocks 18 are inserted between the upper surface of the welded slot plates 16 and the inner surface of the upper I-beam frame 8 in sequence.
2) And respectively installing an input data acquisition and analysis system and an output data acquisition and analysis system on the hinge force amplification structure system and the wellhead connector system.
Specifically, strain gauges are respectively adhered to the upper surface of the transverse rod 21, the upper surface of the upper hinge 22 and the lower surface of the lower hinge 22, and each strain gauge is connected with the first static resistance strain gauge 28 after forming a measuring bridge through a conducting wire; the axial strain gauge 29 and the radial strain gauge 30 on the well head connector system are respectively connected with a second static resistance strain gauge 31 after forming a measuring bridge by conducting wires. And connecting an oil inlet and an oil outlet interface of the hydraulic cylinder and a hydraulic assembly with a pump into a circuit according to a preset hydraulic control circuit diagram.
3) And obtaining the calculated value of the output load of the hydraulic cylinder according to the required load required by the experiment and the initial power multiplying amplification coefficient of the hinge power amplification structure system.
The power amplification coefficient of the hinge power amplification structure system is determined by the length of the hinge and the included angle between the hinge length and the horizontal direction, and the included angle between the hinge length and the horizontal direction is 84.3 in the invention°The theoretical power multiplication amplification coefficient of the hinge power amplification structure system at this time is 10, and the output load value of the hydraulic cylinder is calculated according to the required load and the initial power multiplication amplification coefficient required by the experiment.
4) The hydraulic control system sends control signals to the hydraulic cylinders 23 on the two sides according to the obtained output load calculation value, and a tension, compression and bending load test experiment is carried out.
Before a tension-compression bending test experiment is carried out, firstly, test operation is carried out, a control signal is sent to hydraulic cylinders on two sides through a hydraulic control system, a smaller input hydraulic signal is given, and whether indication values of the first static resistance strain gauge 28 and the second static resistance strain gauge 31 change or not is observed.
Thereafter, when a tensile load experiment was performed: the left hydraulic cylinder is controlled to move rightwards and the right hydraulic cylinder is controlled to move leftwards by a hydraulic control system and a stepper motor controller;
when the pressure load test was performed: the left hydraulic cylinder is controlled to move leftwards and the right hydraulic cylinder is controlled to move rightwards by a hydraulic control system and a stepper motor controller;
when the bending load experiment was performed: and controlling the left hydraulic cylinder and the right hydraulic cylinder to move leftwards simultaneously or controlling the left hydraulic cylinder and the right hydraulic cylinder to move rightwards simultaneously through the hydraulic control system and the stepper motor controller.
5) Analyzing stress data acquired by an acquisition system and an output load calculation value of a hydraulic cylinder according to input and output data to obtain various error values under the load;
the mechanical behavior parameters of the wellhead connector in the invention mainly comprise: the strain force of the upper and lower hinges,
Reading and recording strain values of the transverse rod and strain gauges on the upper/lower hinges displayed on the first static resistance strain gauge 28 and indication values of the connector axial strain gauge 29 and the connector radial strain gauge 30 displayed on the second static resistance strain gauge 31, and observing indication values of the strain gauges on the upper/lower hinges to judge whether errors exist; calculating the stress of the transverse rod and the upper/lower hinges according to the sigma-E epsilon, then calculating the force applied to the transverse rod and the upper/lower hinges according to the F-sigma A, calculating whether the force multiplication coefficient of the force multiplication mechanism is a calculated value or not, and calculating the relative error of the force amplification coefficient; according to the output load of the hydraulic cylinder 23, the deformation of the transverse rod is calculated by utilizing a material mechanics stretching theory, and compared with a strain indicating value of the transverse rod displayed on the first static resistance strain gauge, the error of the output load of the hydraulic cylinder under the condition of leakage and the like is calculated.
6) And (3) under the premise of keeping the loading load of the hydraulic cylinder unchanged, replacing the hinge with the included angle in the horizontal direction different in size, and repeating the step 5), namely under the condition of ensuring that the input load is unchanged, changing the amplification factor of the force amplification mechanism so as to change the size of the output load, so as to observe the mechanical behavior of the wellhead connector and similar mechanisms under different output loads.
The above embodiments are only used for illustrating the present invention, and the structure, connection mode, manufacturing process, etc. of the components may be changed, and all equivalent changes and modifications performed on the basis of the technical solution of the present invention should not be excluded from the protection scope of the present invention.

Claims (9)

1. The utility model provides a well head connector heavy load draws bending test experimental apparatus which characterized in that: the device comprises an auxiliary tool system, a hinge force amplifying structure system, a hydraulic power loading system, an input data acquisition and analysis system and an output data acquisition and analysis system;
the auxiliary tool system is arranged on the existing wellhead connector system; the hinge force amplification structure system is connected with the auxiliary tool system and provides output load for the auxiliary tool system; the hydraulic power loading system is connected with the hinge force amplification structure system and provides input load for the hinge force amplification structure system; the input data acquisition and analysis system is arranged on the hinge force amplification structure system and acquires strain force on the hinge force amplification structure system as actual input load; the output data acquisition and analysis system is arranged on the wellhead connector system and is used for acquiring strain force in the wellhead connector system as actual output load;
the hinge force amplification structure system comprises two hinge force amplification structures which are symmetrically arranged, and each hinge force amplification structure comprises three transverse rods which are arranged side by side and two pairs of hinges which are arranged between the transverse rods at intervals;
the transverse rods are hinged with the end parts of the two pairs of hinges through a middle pin, and the included angles between the upper hinge and the lower hinge of the two pairs of hinges and the transverse rods are the same; the other end of each transverse rod is hinged with the hydraulic power loading system through a small pin, and the other end of each pair of upper and lower hinges of each pair of hinges is hinged with an ear plate and a welding ear plate in the upper and lower I-shaped steel frame assemblies of the auxiliary tool system through a middle pin.
2. The wellhead connector high-load tension-compression bending test experimental device as claimed in claim 1, wherein: the auxiliary tool system comprises an upper I-shaped steel frame, an upper I-shaped steel frame connecting assembly, a connecting welding plate, a lower I-shaped steel frame connecting assembly, a mounting clamp, a lower I-shaped steel frame fixing block and two hydraulic cylinder supporting systems symmetrically arranged on two sides of the lower I-shaped steel frame;
two ends of the upper I-shaped steel frame are connected with the hinge force amplification structure system through the upper I-shaped steel frame connecting assembly, and the bottom of the upper I-shaped steel frame is connected with the upper part of the wellhead connector system through the connecting welding plate;
the two ends of the lower I-shaped steel frame are connected with the hinge force amplification structure system through the lower I-shaped steel frame connecting assembly, the upper part of the lower I-shaped steel frame is connected with the lower part of the wellhead connector system through the mounting clamp, and the lower part of the lower I-shaped steel frame is fixed on the ground through the lower I-shaped steel frame fixing block;
the bottom of the two hydraulic cylinder bases is fixedly arranged on the ground on two sides of the lower I-shaped steel frame through the hydraulic cylinder base backing plates respectively, and the top of the two hydraulic cylinder bases is connected with the two hydraulic cylinder upper cover plates through bolts respectively.
3. The wellhead connector high-load tension-compression bending test experimental device as claimed in claim 2, wherein: the upper I-shaped steel frame connecting assembly comprises a welding groove plate, two irregular cushion blocks, a plurality of regular cushion blocks and two lug plates, wherein a plurality of clamping grooves are formed in the two surfaces of the welding groove plate; one side of the surface of each of the two welding groove plates, which is provided with a clamping groove, is connected with the upper I-shaped steel frame through a bolt, the two irregular cushion blocks are inserted between the two straight notches on the outer side surface of the upper I-shaped steel frame and the welding groove plates, and the upper surfaces of the irregular cushion blocks are matched with the outer side surface of the upper I-shaped steel frame; the regular cushion blocks are inserted between other straight notches of the upper I-shaped steel frame and the welding groove plate; the two lug plates are connected with the two welding groove plates through bolts, and the other side of the surface of the lug plates is provided with a mounting hole for connecting with the hinge force amplification structure system;
i-shaped steel shelf coupling assembling includes two welding otic placodes, two the welding otic placode welds respectively I-shaped steel shelf both ends down, and two the welding otic placode surface be provided with a plurality of be used for with the mounting hole of hinge power amplification structure headtotail.
4. The wellhead connector high-load tension-compression bending test experimental device as claimed in claim 2, wherein: the two hydraulic cylinder supporting systems respectively comprise a hydraulic cylinder base, a hydraulic cylinder base cushion plate with variable height and a hydraulic cylinder upper cover plate;
two the bottom of pneumatic cylinder base is respectively through two pneumatic cylinder base backing plate symmetry sets up the subaerial of I-shaped steel shelf both sides down, two the top of pneumatic cylinder base is bolted connection two respectively the pneumatic cylinder upper cover plate, and two pneumatic cylinder base top is provided with the three chamber that leads to that is used for placing the pneumatic cylinder, two pneumatic cylinder upper cover plate lower surface is provided with and should leads to chamber assorted recess.
5. The wellhead connector high-load tension-compression bending test experimental device as claimed in claim 1, wherein: the hydraulic power loading system comprises a plurality of hydraulic cylinders and a hydraulic control system;
the hydraulic cylinders are respectively arranged in the bases of the two hydraulic cylinders on two sides of the auxiliary tool system, and one end of each hydraulic cylinder is connected with each transverse rod in the hinge force amplifying structure system through a small pin; the end surface of the other end is fixed on the inner surface of the upper cover plate of the hydraulic cylinder by the base of the hydraulic cylinder;
the hydraulic control system comprises a stepping motor controller and a hydraulic circuit assembly with a pump; the stepping motor controller is connected with each hydraulic cylinder through a signal wire and used for providing control signals for each hydraulic cylinder; the pump-containing hydraulic circuit assembly is connected with each hydraulic cylinder and the hydraulic pump station and used for providing hydraulic pressure for each hydraulic cylinder.
6. The wellhead connector high-load tension-compression bending test experimental device as claimed in claim 1, wherein: the input data acquisition and analysis system comprises a plurality of transverse rod tension and compression strain gauges, a plurality of hinge tension and compression strain gauges and a first static resistance strain gauge; the transverse rod tension and compression strain gauges are arranged on the upper surface of each transverse rod of the hinge force amplification structure system, and the hinge tension and compression strain gauges are arranged on the upper surface of the upper hinge and the lower surface of the lower hinge of each pair of hinges of the hinge force amplification structure; and the transverse rod tension and compression strain gauges and the hinge tension and compression strain gauges are connected through a lead to form a measuring bridge and then are connected with the first static resistance strain gauge, so that the strain force on each transverse rod and each hinge is acquired in real time.
7. The wellhead connector high-load tension-compression bending test experimental device as claimed in claim 1, wherein: the output data acquisition and analysis system comprises a connector axial strain gauge, a connector radial strain gauge and a second static resistance meter; the connector axial strain gage disposed on a connector body in the uphole connector system, the connector radial strain gage disposed on a center ring in the uphole connector system; and the axial strain gauge of the connector and the radial strain gauge of the connector are connected through a lead to form a measuring bridge and then are connected with the second static resistance strain gauge to acquire the strain force of the wellhead connector system in real time.
8. A wellhead connector high-load tension-compression bending test experiment method adopting the device as claimed in any one of claims 1-7, characterized by comprising the following steps:
1) well head connector systems are connected with the auxiliary tool system, the hinge force amplification structure system and the hydraulic power loading system respectively;
2) respectively installing an input data acquisition and analysis system and an output data acquisition and analysis system on the hinge force amplification structure system and the wellhead connector system;
3) obtaining an output load calculation value of the hydraulic cylinder according to the required load required by the experiment and the initial power multiplying amplification coefficient of the hinge power amplification structure system;
4) the hydraulic control system sends control signals to the hydraulic cylinders on the two sides according to the obtained output load calculation value to carry out a tension, compression and bending load test experiment;
5) analyzing stress data acquired by an acquisition system and an output load calculation value of a hydraulic cylinder according to input and output data to obtain various error values under the load;
6) and on the premise of keeping the output load of the hydraulic cylinder unchanged, changing the power amplification coefficient of the hinge power amplification structure system, repeating the steps 4-5), and observing the mechanical behavior of the wellhead connector system under different output loads.
9. The wellhead connector high-load tension-compression bending test experimental method as claimed in claim 8, wherein: in the step 4), the hydraulic control system sends a control signal to the hydraulic cylinders on the two sides according to the obtained output load calculation value, and the method for carrying out the tension, compression and bending load test experiment comprises the following steps:
when the tensile load experiment was performed: the left hydraulic cylinder is controlled to move rightwards and the right hydraulic cylinder is controlled to move leftwards by a hydraulic control system and a stepper motor controller;
when the pressure load test was performed: after the trial operation, the left hydraulic cylinder is controlled to move leftwards and the right hydraulic cylinder is controlled to move rightwards by the hydraulic control system and the stepping motor controller;
when the bending load experiment was performed: and the left hydraulic cylinder is controlled to move leftwards and the right hydraulic cylinder is controlled to move rightwards by a hydraulic control system and a stepping motor controller.
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