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

Abstract

The invention relates to a large-load tensile-compression-bending test experimental device and experimental method for a wellhead connector. Analysis system; the auxiliary tooling system is set on the existing wellhead connector system; the hinge force amplifying structure system is connected with the auxiliary tooling system to provide output load for the auxiliary tooling system; the hydraulic power loading system is connected with the hinge force amplifying structure system, which is the hinge force The amplification structure provides the input load; the input data acquisition and analysis system is set on the hinge force amplification structure system, and the strain force on the hinge force amplification structure is collected as the actual input load; the output data acquisition and analysis system is set on the wellhead connector system, and the wellhead connection is collected. The strain force in the system is used as the actual output load. The invention can be widely used in the technical field of underwater oil and gas exploitation.

Description

An experimental device and experimental method for a large-load tensile-compression-bending test of a wellhead connector

technical field

The invention relates to the technical field of underwater oil and gas exploitation, in particular to an experimental device and an experimental method for a large-load tension-compression-bending test of a wellhead connector.

Background technique

The subsea Christmas tree is an oil production system composed of valves, pipelines, connectors and accessories placed on the subsea wellhead of the seabed, and the subsea Christmas tree wellhead connector is an important part of the subsea Christmas tree, which can Connect underwater production facilities such as underwater Christmas tree to the underwater wellhead, realize the sealing of the connection between the underwater Christmas tree and the underwater wellhead, prevent oil and gas leakage, and carry internal and external loads. The wellhead connector and the subsea tree are generally connected by a special trapezoidal thread, which has a good pressure bearing capacity. However, due to the swing or vibration of the pipelines in the underwater Christmas tree under the action of the ocean current, the wellhead connector will be subjected to a large load including tension, compression and bending. It is necessary to ensure the safe and reliable production of the underwater production system including the underwater Christmas tree, so it is very important to conduct a large load test on the wellhead connector to observe its performance.

At present, there are a large number of comprehensive experimental devices for tension, compression and bending in China. A multi-functional testing machine platform component proposed in Chinese Patent Document 200520029374.2 can be added to the platform for various auxiliary devices to realize multi-functional testing under four loads of tension, compression, bending and torsion. A variety of material and structural tests were performed, but the experimental setup failed to take into account the errors of the components. Chinese patent document 201420622826.7 proposes a mechanical experimental device that can perform various experiments such as the measurement of the bending normal stress of the beam, the compression-bending combined deformation experiment, the measurement of the internal force of the truss, the measurement of the internal force of a statically indeterminate structure, and the measurement of the internal force of a statically indeterminate structure. Although the effects of manufacturing errors were considered in the experiments, experiments with larger loads could not be realized. Moreover, there is no research on a simple and economical experimental device for carrying out large-load experiments on wellhead connectors and similar mechanisms at home and abroad. In addition, the tension-compression-bending experimental device in the prior art also has the following shortcomings:

1. When conducting different experiments, it is usually necessary to make different experimental devices, which increases the cost of the experimental site and the experiment, and reduces the experimental efficiency.

2. When doing a large load experiment, a large input load is required to complete the task, and the load input system is required to be higher, which will also increase the cost of the experiment.

3. The existing tensile-compression-bending experimental device usually only considers the deformation measurement of the test piece in measurement, but does not consider whether the input load meets the requirements.

SUMMARY OF THE INVENTION

In view of the above problems, the purpose of the present invention is to provide a high-load tensile-compression-bending test device and an experimental method for wellhead connectors, which can perform high-load tensile-compression-bending experiments on wellhead connectors and similar mechanisms, with low load input and high load. The characteristics of the output, and the installation and removal is convenient.

In order to achieve the above purpose, the present invention adopts the following technical solutions: a large-load tensile-compression-bending test device for wellhead connectors, characterized in that it includes an auxiliary tooling system, a hinge force amplification structure system, a hydraulic power loading system, and an input data acquisition system. an analysis system and an output data acquisition and analysis system; the auxiliary tooling system is arranged on the existing wellhead connector system; the hinge force amplification structure system is connected with the auxiliary tooling system, and provides an output load for the auxiliary tooling system; The hydraulic power loading system is connected with the hinge force amplifying structure system, and provides input load for the hinge force amplifying structure; the input data acquisition and analysis system is arranged on the hinge force amplifying structure system, and collects the hinge force amplifying structure. The strain force on the structure is used as the actual input load; the output data acquisition and analysis system is set on the wellhead connector system, and the strain force in the wellhead connector system is collected as the actual output load.

The auxiliary tooling system includes an upper I-beam frame, an upper I-beam frame connection assembly, a connecting welding plate, a lower I-beam frame, a lower I-beam frame connection assembly, an installation fixture, and a lower I-beam frame. A sub-fixing block and two hydraulic cylinder support systems symmetrically arranged on both sides of the lower I-beam frame; both ends of the upper I-beam frame are connected to the hinge force amplification structure through the upper I-beam connecting assembly system connection, the bottom of the upper I-beam frame is connected to the upper part of the wellhead connector system through the connecting welding plate; The hinge force amplifying structure system is connected, the upper part of the lower I-beam frame is connected with the lower part of the wellhead connector system through the installation fixture, and the lower part of the lower I-beam frame passes through the lower I-beam frame. The sub-fixing blocks are fixed on the ground; the bottoms of the two hydraulic cylinder bases are respectively fixed on the ground on both sides of the lower I-beam frame through the hydraulic cylinder base pads, and the bottoms of the two hydraulic cylinder bases are respectively fixed on the ground on both sides of the lower I-beam frame. The tops are respectively bolted to connect the upper cover plates of the two hydraulic cylinders.

The upper I-beam frame connection assembly includes a welding groove plate with a plurality of clamping grooves on both surfaces, two irregular spacers, a number of regular spacers and two lug plates; the surfaces of the two welding groove plates are provided with clamping grooves. One side is bolted to the upper I-beam frame, and the two irregular spacers are inserted between the two straight slots on the outer side of the upper I-beam frame and the welding groove plate, and the The upper surface of the irregular spacer is matched with the outer surface of the upper I-beam frame; a number of the regular spacers are inserted into other straight slots of the upper I-beam frame and the welding groove plate between the two ear plates and the two welding groove plates are bolted, and the other side of the surface is provided with a mounting hole for connecting with the hinge force amplifying structure system; the lower I-beam frame connection assembly includes Two welding lugs, the two welding lugs are respectively welded on both ends of the lower I-beam frame, and the surfaces of the two welding lugs are provided with a number of mounting holes for connecting with the hinge force amplification structure system .

Both the hydraulic cylinder support systems include a hydraulic cylinder base, a hydraulic cylinder base pad with a variable height, and a hydraulic cylinder upper cover; the bottoms of the two hydraulic cylinder bases pass through the two hydraulic cylinder bases respectively. The backing plates are symmetrically arranged on the ground on both sides of the lower I-beam frame, the tops of the two hydraulic cylinder bases are respectively bolted to the upper cover plates of the two hydraulic cylinders, and the tops of the two hydraulic cylinder bases are provided with The three through cavities of the hydraulic cylinder are placed, and the lower surfaces of the upper cover plates of the two hydraulic cylinders are provided with grooves matching the through cavities.

The hinge force amplifying structure system includes two symmetrically arranged hinge force amplifying structures, and each of the hinge force amplifying structures includes three lateral rods arranged side by side and two pairs of hinges arranged between the lateral rods at intervals; The ends of each of the transverse rods and the two pairs of hinges are hinged through a middle pin, and the upper and lower hinges of the two pairs of the hinges have the same angle with each of the transverse rods; the other end of each of the transverse rods is connected to each other through a small pin. The hydraulic power loading system is hinged, and the other ends of the upper and lower hinges in each pair of the hinges are respectively hinged with the lugs and the welding lugs in the upper and lower I-beam subassemblies of the auxiliary tooling system through middle pins. .

The hydraulic power loading system includes a number of hydraulic cylinders and a hydraulic control system; each of the hydraulic cylinders is respectively arranged in the two hydraulic cylinder bases on both sides of the auxiliary tooling system, and one end of each of the hydraulic cylinders passes through a small pin It is connected with each transverse rod in the hinge force amplification structure system; the other end face is fixed by the hydraulic cylinder base and the inner surface of the upper cover plate of the hydraulic cylinder; the hydraulic control system includes a stepper motor controller and a hydraulic circuit including a pump components; the stepper motor controller is connected with each of the hydraulic cylinders through signal lines to provide control signals for each hydraulic cylinder; the pump-containing hydraulic circuit component is connected to each of the hydraulic cylinders and the hydraulic pump station for use in Hydraulic pressure is provided to each of the hydraulic cylinders.

The input data acquisition and analysis system includes a number of transverse rod tension and compression strain gauges, a number of hinge tension and compression strain gauges, and a first static resistance strain gauge; On the upper surface of the rod, 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; each of the transverse rod tension and compression strain gauges and hinge tension and compression The strain gauges are connected with wires to form a measurement bridge and then connected to the first static resistance strain gauge, and real-time acquisition of the strain force on each of the transverse rods and hinges.

The output data acquisition and analysis system includes a connector axial strain gauge, a connector radial strain gauge and a second static resistance instrument; the connector axial strain gauge is arranged on the connector body in the wellhead connector system , the connector radial strain gauge is arranged on the center ring in the wellhead connector system; the connector axial strain gauge and the connector radial strain gauge are connected by wires to form a measurement bridge and then connected to the The second static resistance strain gauge is connected to collect the strain force of the wellhead connector system in real time.

An experimental method for high-load tension-compression-bending test of a wellhead connector using the device, which is characterized by comprising the following steps: 1) respectively connecting the wellhead connector system with the auxiliary tooling system, the hinge force amplification structure system and the hydraulic power loading system Good; 2) The input data acquisition and analysis system and the output data acquisition and analysis system are installed on the hinge force amplification structure system and the wellhead connector system respectively; 3) The required load according to the experimental requirements, and the initial times of the hinge force amplification structure system The force amplification factor is used to obtain the calculated value of the output load of the hydraulic cylinder; 4) The hydraulic control system sends a control signal to the hydraulic cylinders on both sides according to the obtained calculated value of the output load, and performs tensile, compressive and bending load test experiments; 5) According to the input and output The stress data collected by the data analysis and acquisition system and the calculated value of the output load of the hydraulic cylinder are used to obtain various error values under the load; 6) On the premise of keeping the output load of the hydraulic cylinder unchanged, change the double force of the hinge force amplification structure system Increase the amplification factor, repeat steps 4-5), and observe 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 both sides according to the obtained calculated value of the output load, and the method for carrying out the tensile, compressive and bending load test experiments is: when carrying out the tensile load test: through the hydraulic control system and the stepper motor controller to control the left hydraulic cylinder to move to the right and the right hydraulic cylinder to move to the left; when the pressure load experiment is performed: after the test run, the left hydraulic cylinder is controlled by the hydraulic control system and the stepper motor controller to move to the left. Left and right hydraulic cylinders move to the right; when the bending load experiment is performed: the left hydraulic cylinder is controlled to move left and the right hydraulic cylinder is moved to the right through the hydraulic control system and the stepper motor controller.

The present invention has the following advantages due to the adoption of the above technical solutions: 1. The present invention can amplify the input load by 20 times due to the provision of a hinge force amplifying structure system, and the multiplying force can be changed by changing the hinge length and the included angle in the horizontal direction. The amplification factor reduces the output load requirements of the hydraulic cylinder, and can meet the various load requirements of the tension-compression-bending test experiment. 2. The auxiliary tooling system of the present invention adopts a hinged connection method with the experimental object, which is convenient for dismantling. When it is necessary to perform tension, compression and bending experiments on different experimental objects, it is only necessary to hoist the auxiliary tooling system and twist down the simulated wellhead of the transition device. Yes, and then use different transition devices according to different test pieces. 3. In the present invention, since the upper I-beam connecting component is provided with a welding groove plate, by adjusting the structure and height of the regular spacer block and the irregular spacer block, and then adjusting the welding groove plate up and down, the installation error and the manufacture of hinges can be eliminated. error, ensure correct installation. 4. The length of the hinge in the hinge force amplification structure of the present invention and the height of the cushion block at the bottom of the hydraulic cylinder can be adjusted, which realizes different requirements for the large-load tension-compression-bending experiment of wellhead connectors or similar mechanisms, and has a wider application range . 5. The experimental device is simple in structure, reasonable in design, small in occupied space, high in repeated utilization rate of the experimental device, has the characteristics of low load input and large load output, is economical and applicable, and has a good guiding effect on the production site.

Description of drawings

Fig. 1 is the front view overall structure sectional schematic diagram of the present invention;

FIG. 2 is a schematic cross-sectional view of the overall structure of the present invention;

3 is a three-dimensional schematic diagram of an I-beam frame and a fixing block under the present invention;

4 is a schematic side view of the I-beam frame and the fixing block under the present invention;

5 is a schematic diagram of the assembly structure of the groove plate and the upper I-beam shelf in the present invention;

6 is a schematic diagram of the three-dimensional structure of the groove plate in the present invention;

Fig. 7 is the front view of the groove plate in the present invention;

Fig. 8 is the top view of the groove plate in the present invention;

Fig. 9 is the side view of the groove plate in the present invention;

10 is a schematic diagram of the three-dimensional structure of the middle ear plate of the present invention;

Fig. 11 is the front view of the middle ear plate of the present invention;

12 is a schematic structural diagram of the hinge force amplification member of the present invention;

FIG. 13 is a front view of the hinge force amplifying member of FIG. 12 .

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

As shown in Figures 1 to 5, the present invention provides a large-load tensile-compression-bending test device for a wellhead connector, including an auxiliary tooling 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; wherein, the auxiliary tooling system is set on the existing wellhead connector system or similar mechanism, and the hinge force amplification structure system is connected with the auxiliary tooling system to provide output load for the auxiliary tooling system; the hydraulic power loading system is connected with the hinge force amplification system The structure system is connected to provide input load for the hinge force amplification structure; the input data acquisition and analysis system is set on the hinge force amplification structure system, and the strain force on the hinge force amplification structure is collected as the actual input load; the output data acquisition and analysis system is set in the wellhead connection On the connector system, the strain force in the wellhead connector system is collected as the actual output load.

The wellhead connector system includes a simulated tree body 1 , a Christmas tree test pile 2 , a connector body 3 , a support ring 4 , a center ring 5 , a lock block 6 and a drive ring 7 . Among them, the simulated tree body 1 is arranged on the upper part of the Christmas tree test pile 2 , and the two are connected by a connector body 3 in a sealed manner. The upper part of the connector body 3 is fixedly connected to the lower part of the simulated tree body 1 , and the lower part of the connector body 3 is fixedly connected to the upper part of the center ring 5 sleeved outside the Christmas tree test pile 2 through the support ring 4 . A plurality of lock blocks 6 are arranged at intervals in the cavity of the connector body 3 , and each lock block 6 is connected to the outer wall of the Christmas tree test pile 2 through internal threads. A drive ring 7 is sleeved on the outside of the connector body 3, and the connector body 3 and the drive ring 7 are in slant contact, which is used to move up and down under the hydraulic drive, and push the lock block 6 into/out of the Christmas tree test pile 2. Inside/outside the threaded groove to lock/unlock the wellhead and the equipment above the wellhead.

The auxiliary tooling system includes an upper I-beam frame 8, a connecting welding plate 9, a lower I-beam frame 10, an installation fixture 11, a lower I-beam frame fixing block 12, an upper I-beam frame connection component, and a lower I-beam frame. The steel frame connecting assembly and the hydraulic cylinder support system symmetrically arranged on both sides of the lower I-beam frame 10. Wherein, both ends of the upper I-beam frame 8 are connected with the hinge force amplification structure system through the upper I-beam connecting assembly, and the bottom of the upper I-beam frame 8 is connected to the simulation tree on the upper part of the wellhead connector system through the welded connection welding plate 9 Body 1 is connected. Both ends of the lower I-beam frame 10 are connected to the hinge force amplification structure system through the lower I-beam connecting assembly, and the upper part of the lower I-beam frame 10 is connected to the lower part of the Christmas tree test pile 2 at the lower part of the wellhead connector system through the installation fixture 11 , the lower part of the lower I-beam frame 10 is fixed on the ground through the fixing block 12 of the lower I-beam frame.

Both hydraulic cylinder support systems include a hydraulic cylinder base 13 , a hydraulic cylinder base backing plate 14 with a variable height, and a hydraulic cylinder upper cover 15 . The bottoms of the two hydraulic cylinder bases 13 are respectively arranged symmetrically on the ground on both sides of the lower I-beam frame 10 through the two hydraulic cylinder base backing plates 14, and the tops of the two hydraulic cylinder bases 13 are respectively bolted to the two hydraulic cylinder upper cover plates 15, The tops of the two hydraulic cylinder bases 13 are provided with three through cavities for placing the hydraulic cylinders, and the lower surfaces of the upper cover plates 15 of the two hydraulic cylinders are provided with grooves matching the through cavities.

As shown in FIGS. 6 to 11 , the upper I-beam frame connection assembly includes a welded groove plate 16 with several clamping grooves on both surfaces, two irregular spacers 17 , several regular spacers 18 and two lugs 19 . The surface of the two welding groove plates 16 is connected with the upper I-beam frame 8 by bolts, and the two irregular spacers 17 are inserted into the two straight grooves and welding grooves on the outer side of the upper I-beam frame 8 Between the plates 16, and the upper surface of the irregular spacer 17 matches the outer surface of the upper I-beam frame 8; a number of regular spacers 18 are inserted into other straight slots and welding grooves of the upper I-beam frame 8 between the plates 16. The two lugs 19 are connected with the two welding groove plates 16 by bolts, and the other side of the surfaces of the two lugs 19 is provided with a mounting hole for connecting with the hinge force amplifying structure system.

The lower I-beam frame connecting assembly includes two welding lugs 20, the two welding lugs 20 are respectively welded on both ends of the lower I-beam frame 10, and the surfaces of the two welding lugs 20 are provided with a number of structures for amplifying the force of the hinge. Mounting holes for system connections.

As shown in Figures 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 lateral rods 21 arranged side by side and two pairs of lateral rods arranged at intervals between them. between hinges 22. The ends of each transverse rod 21 and the two pairs of hinges 22 are hinged through a middle pin, and the upper and lower hinges of the two pairs of hinges have the same angle with the transverse rod 21 . The other end of each transverse rod 21 is hinged with the hydraulic power loading system through a small pin, and the other ends of the upper and lower hinges in each pair of the hinges 22 are respectively connected with the upper and lower I-beam subassemblies in the auxiliary tooling system through a middle pin. The lug 19 is connected to the welding lug 20.

The hydraulic power loading system includes several hydraulic cylinders 23 and a hydraulic control system composed of a stepper motor controller 24 and a hydraulic circuit assembly 25 including a pump. Each hydraulic cylinder 23 is respectively arranged in the hydraulic cylinder base 13 on both sides of the auxiliary tooling system, and one end of each hydraulic cylinder 23 is connected with the transverse rod 21 in the hinge force amplification structure system through a small pin, and the other end face is supported by the hydraulic cylinder base 13. It is fixed with the inner surface of the upper cover plate 15 of the hydraulic cylinder. The stepper motor controller 24 is connected with each hydraulic cylinder 23 through a signal line, and is used to provide control signals for each hydraulic cylinder 23; Hydraulic is provided.

The input data acquisition and analysis system includes several transverse rod tension and compression strain gauges 26 , several hinge tension and compression strain gauges 27 and a first static resistance strain gauge 28 . The transverse rod tension and compression strain gauges 26 are arranged on the upper surface of each transverse rod 21 in the hinge force amplification structure system, and the hinge tension and compression strain gauges 27 are arranged on the upper surface of each upper hinge 22 and the lower part of the lower hinge 22 in the hinge force amplification structure system. on the surface. Each transverse rod tension-compression strain gauge 26 and hinge tension-compression strain gauge 27 are connected by wires to form a measurement bridge and then connected to the first static resistance strain gauge 28 to collect the strain force on each transverse rod 21 and hinge 22 in real time.

The output data acquisition and analysis system includes a connector axial strain gauge 29 , a connector radial strain gauge 30 and a second static resistance meter 31 . The connector axial strain gauges 29 are provided on the connector body 3 in the wellhead connector system, and the connector radial strain gauges 30 are provided on the center ring 5 in the wellhead connector system. Each connector axial strain gauge 29 and connector radial strain gauge 30 are connected by wires to form a measuring bridge and then connected to the second static resistance strain gauge 31 to collect the axial and radial directions of the connector body in the wellhead connector system in real time. of strain.

Based on the above-mentioned large-load tensile-compression-bending test device for wellhead connectors, the present invention also provides a large-load tensile-compression-bending test method for wellhead connectors, comprising the following steps:

1) Install the wellhead connector system auxiliary tooling system, hinge force amplification structure system and hydraulic power loading system respectively.

The installation method includes the following steps:

①Place the lower I-beam frame 10 on the ground, and fix it on the ground through the mounting holes on the fixing block 12 of the lower I-beam frame.

② Place the two hydraulic cylinder bases 13 on the ground on both sides of the lower I-beam frame 10 in sequence according to the pre-calculated distance, and fix them on the ground through the mounting holes on the backing plate 14 of the hydraulic cylinder base.

③ Place each hydraulic cylinder 23 in the through cavity on the top of the two hydraulic cylinder bases 13 , and fix the upper cover plate 15 of the hydraulic cylinder on the top of the hydraulic cylinder base 13 with bolts.

④ Place the wellhead connector system between the upper and lower I-beam frames 8 and 10 , the upper part is fixed by the connecting welding plate 9 , and the lower part is fixed by the installation fixture 11 .

⑤ Connect each transverse rod 21 to the hydraulic cylinder 23 , the transverse rod 21 to the upper and lower hinges 22 , the upper hinge 22 to the lug 19 , and the lower hinge 22 to the welding lug 20 with pins in sequence.

⑥ Install the upper I-beam frame 8 and the two welding groove plates 16. During installation, install two bolts in each straight slot on the two outer sides of the upper I-beam frame 8. If the welding groove plate 16 and the straight There is a dislocation between the slots, and the welding slot plate 16 needs to be moved up and down to adjust, and then the irregular spacer 17 and the regular spacer 18 are inserted between the upper surface of the welding slot plate 16 and the inner surface of the upper I-beam frame 8 in turn.

2) The input data acquisition and analysis system and the output data acquisition and analysis system are respectively installed on the hinge force amplification structure system and the wellhead connector system.

Specifically, strain gauges are respectively pasted on 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 to the first static resistance strain gauge 28 after forming a measurement bridge through wires; The connector axial strain gauge 29 and the connector radial strain gauge 30 on the wellhead connector system respectively form a measuring bridge through wires and then connect to the second static resistance strain gauge 31 . According to the preset hydraulic control circuit diagram, connect the oil inlet, oil outlet interface of the hydraulic cylinder and the hydraulic components including the pump into the circuit.

3) According to the required load required by the experiment and the initial multiplication factor of the hinge force amplification structure system, the calculated value of the output load of the hydraulic cylinder is obtained.

The force magnification factor of the hinge force amplifying structural system is determined by the length of the hinge and its included angle with the horizontal direction. In the present invention, a hinge with an included angle of 84.3 ^° with the horizontal direction is used first. At this time, the hinge force amplifying structure system is theoretically The multiplier magnification factor is 10. According to the required load required by the experiment and the initial multiplier magnification factor, the output load value of the hydraulic cylinder is calculated.

4) The hydraulic control system sends a control signal to the hydraulic cylinders 23 on both sides according to the obtained calculated value of the output load, and performs tensile, compressive and bending load test experiments.

Before carrying out the tension-compression-bending test experiment, first carry out a trial operation, send control signals to the hydraulic cylinders on both sides through the hydraulic control system, and input hydraulic signals to the smaller ones, and observe the indications of the first and second static resistance strain gauges 28 and 31. change.

Afterwards, when carrying out the tensile load experiment: control the left hydraulic cylinder to move to the right and the right hydraulic cylinder to the left through the hydraulic control system and the stepper motor controller;

When carrying out the pressure load experiment: control the left hydraulic cylinder to move to the left and the right hydraulic cylinder to the right through the hydraulic control system and the stepper motor controller;

When the bending load experiment is performed: the left and right hydraulic cylinders are controlled to move to the left at the same time through the hydraulic control system and the stepper motor controller, or the left and right hydraulic cylinders to move to the right at the same time.

5) According to the stress data collected by the input and output data analysis and acquisition system and the calculated value of the output load of the hydraulic cylinder, various error values under the load are obtained;

The mechanical behavior parameters of the wellhead connector involved in the present invention mainly include: upper and lower hinge strain force,

Read and record the strain values of the transverse rods and the strain gauges on the upper/lower hinges displayed on the first static resistance strain gauge 28 and the connector axial strain gauges 29 and connector diameters shown on the second static resistance strain gauge 31. Show the value to the strain gauge 30, observe the indication value of the strain gauge on the upper and lower hinges to judge whether there is an error; calculate the stress of the transverse rod and the upper/lower hinge according to σ=Eε, and then calculate the transverse rod and upper/lower hinge according to F=σA For the received force, calculate whether the multiplier force coefficient of the multiplier mechanism is the calculated value at this time, and calculate the relative error of the force amplification coefficient; Comparing the indicated values of the transverse rod strain displayed on the resistance strain gauge, the error of the output load of the hydraulic cylinder in the presence of leakage is calculated.

6) Under the premise of keeping the loading load of the hydraulic cylinder unchanged, replace the hinge with a different angle from the horizontal direction, and repeat step 5), that is, under the condition that the input load remains unchanged, change the amplification factor of the force amplification mechanism and then change The magnitude of the output load to observe the mechanical behavior of wellhead connectors and similar mechanisms under different output loads.

The above-mentioned embodiments are only used to illustrate the present invention, and the structure, connection method and manufacturing process of each component can be changed to some extent. Any equivalent transformation and improvement based on the technical solution of the present invention should not be used. Excluded from the scope of protection of the present invention.

Claims (9)

1. a wellhead connector large-load tension-compression-bending test experimental device is characterized in that: it comprises an auxiliary tooling 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 auxiliary tooling system is arranged on the existing wellhead connector system; the hinge force amplification structure system is connected with the auxiliary tooling system to provide output load for the auxiliary tooling system; the hydraulic power loading system is connected with the hinge The force amplification structure system is connected to provide input load for the hinge force amplification structure system; the input data acquisition and analysis system is set on the hinge force amplification structure system, and the strain force on the hinge force amplification structure system is collected as the actual input load; the output data acquisition and analysis system is set on the wellhead connector system, and the strain force in the wellhead connector system is collected as the actual output load; The hinge force amplifying structure system includes two symmetrically arranged hinge force amplifying structures, and each of the hinge force amplifying structures includes three lateral rods arranged side by side and two pairs of hinges arranged at intervals between the lateral rods; The ends of each of the transverse rods and the two pairs of hinges are hinged through a middle pin, and the upper and lower hinges of the two pairs of the hinges have the same included angle with each of the transverse rods; the other end of each of the transverse rods is connected by a small pin It is hinged with the hydraulic power loading system, and the other ends of the upper and lower hinges in each pair of the hinges are respectively connected with the lugs and welding lugs in the upper and lower I-beam subassemblies of the auxiliary tooling system through middle pins. Hinged. 2. a kind of wellhead connector large-load tension-compression-bending test experimental device as claimed in claim 1, is characterized in that: described auxiliary tooling system comprises upper I-beam frame, upper I-beam frame connection assembly, connection Welding plate, lower I-beam frame, lower I-beam frame connection assembly, installation fixture, lower I-beam frame fixing block and two hydraulic cylinder support systems symmetrically arranged on both sides of the lower I-beam frame ; Both ends of the upper I-beam frame are connected to the hinge force amplification structure system through the upper I-beam frame connecting assembly, and the bottom of the upper I-beam frame is connected to the wellhead through the connection welding plate. the upper connection of the connector system; Both ends of the lower I-beam frame are connected to the hinge force amplifying structure system through the lower I-beam frame connecting assembly, and the upper part of the lower I-beam frame is connected to the wellhead through the installation fixture The lower part of the lower I-beam frame is connected to the ground through the fixing block of the lower I-beam frame; The bottoms of the two hydraulic cylinder bases are respectively fixed on the ground on both sides of the lower I-beam frame through the hydraulic cylinder base backing plates, and the tops of the two hydraulic cylinder bases are respectively bolted to the two hydraulic cylinders. cover plate. 3. The large-load tensile-compression-bending test device of a wellhead connector as claimed in claim 2, wherein the upper I-beam frame connecting assembly comprises a welding groove plate with several clamping grooves provided on both surfaces, Two irregular spacers, a number of regular spacers and two lugs; one side of the surface of the two welding groove plates with a clamping groove is bolted to the upper I-beam frame, and the two irregular spacers are inserted Between the two straight notches on the outer side of the upper I-beam frame and the welding groove plate, and the upper surface of the irregular spacer matches the outer surface of the upper I-beam frame; a number of The regular spacer is inserted between the other straight slots of the upper I-beam frame and the welding groove plate; the two lugs are bolted to the two welding groove plates, and the other side of the surface is A mounting hole is provided for connecting with the hinge force amplifying structure system; The lower I-beam frame connection assembly includes two welding lugs, the two welding lugs are respectively welded on both ends of the lower I-beam frame, and the surfaces of the two welding lugs are provided with a plurality of flanges for connecting with each other. The hinge force amplifying structural system is connected to the mounting hole. 4. The large-load tension-compression-bending test device for a wellhead connector according to claim 2, wherein the two hydraulic cylinder support systems both comprise a hydraulic cylinder base and a hydraulic cylinder base with a variable height a backing plate and an upper cover plate of a hydraulic cylinder; The bottoms of the two hydraulic cylinder bases are symmetrically arranged on the ground on both sides of the lower I-beam frame through the two hydraulic cylinder base backing plates, and the tops of the two hydraulic cylinder bases are respectively bolted to connect the two The upper cover plate of the hydraulic cylinder is provided with three through cavities for placing the hydraulic cylinders on the tops of the bases of the two hydraulic cylinders, and the lower surfaces of the upper cover plates of the two hydraulic cylinders are provided with grooves matching the through cavities. 5. The large-load tension-compression-bending test device for a wellhead connector according to claim 1, wherein the hydraulic power loading system comprises several hydraulic cylinders and a hydraulic control system; Each of the hydraulic cylinders is respectively arranged in the bases of the two hydraulic cylinders on both sides of the auxiliary tooling system, and one end of each of the hydraulic cylinders is connected with each transverse rod in the hinge force amplification structure system through a small pin ; The other end face is fixed by the base of the hydraulic cylinder and the inner surface of the upper cover plate of the hydraulic cylinder; The hydraulic control system includes a stepper motor controller and a pump-containing hydraulic circuit assembly; the stepper motor controller is connected to each of the hydraulic cylinders through signal lines, and is used to provide control signals for each hydraulic cylinder; The hydraulic circuit assembly connects each of the hydraulic cylinders and the hydraulic pump station, and is used for providing hydraulic pressure to each of the hydraulic cylinders. 6. The large-load tension-compression-bending test device for wellhead connectors according to claim 1, wherein the input data acquisition and analysis system comprises several transverse rod tension-compression strain gauges, several hinge tension-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 each pair of the hinge force amplification structure The upper surface of the upper hinge of the hinge and the lower surface of the lower hinge; each of the transverse rod tension and compression strain gauges and the hinge tension and compression strain gauges are connected by wires to form a measurement bridge and then connected to the first static resistance strain gauge, real-time Strain forces on each of the transverse rods and hinges are collected. 7. The large-load tensile-compression-bending test device for wellhead connectors according to claim 1, wherein the output data acquisition and analysis system comprises a connector axial strain gauge, a connector radial strain gauge and a first Two static resistance meters; the connector axial strain gauge is arranged on the connector body in the wellhead connector system, and the connector radial strain gauge is arranged on the center ring in the wellhead connector system; Each of the connector axial strain gauges and the connector radial strain gauges are connected by wires to form a measuring bridge and then connected to the second static resistance strain gauge to collect the strain force of the wellhead connector system in real time. 8. A method for testing the large-load tension-compression-bending test of a wellhead connector using the device according to any one of claims 1 to 7, characterized in that it comprises the following steps: 1) Connect the wellhead connector system with the auxiliary tooling system, the hinge force amplification structure system and the hydraulic power loading system respectively; 2) The input data acquisition and analysis system and the output data acquisition and analysis system are respectively installed on the hinge force amplification structure system and the wellhead connector system; 3) According to the required load required by the experiment and the initial multiplication factor of the hinge force amplification structure system, the calculated value of the output load of the hydraulic cylinder is obtained; 4) The hydraulic control system sends a control signal to the hydraulic cylinders on both sides according to the calculated value of the output load, and performs tensile, compressive and bending load test experiments; 5) According to the stress data collected by the input and output data analysis and acquisition system and the calculated value of the output load of the hydraulic cylinder, various error values under the load are obtained; 6) Under the premise of keeping the output load of the hydraulic cylinder unchanged, change the multiplication factor of the hinge force amplification structure system, repeat steps 4-5), and observe the mechanical behavior of the wellhead connector system under different output loads. 9. a kind of wellhead connector large load tension-compression-bending test method as claimed in claim 8, is characterized in that: in described step 4), hydraulic control system sends control signal to both sides according to the output load calculation value obtained Hydraulic cylinder, the method of performing tensile, compressive and bending load test experiments is as follows: When carrying out the tensile load experiment: control the left hydraulic cylinder to move to the right and the right hydraulic cylinder to the left through the hydraulic control system and the stepper motor controller; When carrying out the pressure load experiment: after the trial operation, the left hydraulic cylinder is controlled to move to the left and the right hydraulic cylinder to the right through the hydraulic control system and the stepper motor controller; When the bending load experiment is performed: the left hydraulic cylinder is controlled to move to the left and the right hydraulic cylinder to the right through the hydraulic control system and the stepper motor controller.

Images