CN114991698B - System and method for testing underwater wellhead connector in locking state - Google Patents
System and method for testing underwater wellhead connector in locking state Download PDFInfo
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- CN114991698B CN114991698B CN202210606350.7A CN202210606350A CN114991698B CN 114991698 B CN114991698 B CN 114991698B CN 202210606350 A CN202210606350 A CN 202210606350A CN 114991698 B CN114991698 B CN 114991698B
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- 238000012360 testing method Methods 0.000 title claims abstract description 156
- 238000000034 method Methods 0.000 title description 10
- 238000007789 sealing Methods 0.000 claims abstract description 30
- 239000010720 hydraulic oil Substances 0.000 claims description 41
- 239000003921 oil Substances 0.000 claims description 40
- 230000005540 biological transmission Effects 0.000 claims description 37
- 238000005452 bending Methods 0.000 claims description 19
- 230000008859 change Effects 0.000 claims description 13
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 210000001503 joint Anatomy 0.000 claims description 2
- 238000010998 test method Methods 0.000 claims 2
- 230000013011 mating Effects 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 24
- 239000003208 petroleum Substances 0.000 abstract description 4
- 238000003466 welding Methods 0.000 description 11
- 238000005553 drilling Methods 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 7
- 238000011161 development Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/035—Well heads; Setting-up thereof specially adapted for underwater installations
- E21B33/038—Connectors used on well heads, e.g. for connecting blow-out preventer and riser
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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Abstract
The invention relates to a testing system and a testing method for an underwater wellhead connector in a locking state, wherein the testing system comprises the following steps: an upper test stake for sealing an upper interface of the subsea wellhead connector; the high-pressure wellhead testing pile is used for sealing a lower interface of the underwater wellhead connector, and an oil filling port is arranged on the high-pressure wellhead testing pile; the hydraulic power loading system is connected with the upper test pile and is used for applying load to the upper test pile; the hydraulic pump is electrically connected with the data acquisition and control system. The testing system and the testing method are simple in structure and high in repeatability, can fully test the load failure characteristic of the underwater wellhead connector in the locking state, and guarantee the safety of deep water petroleum exploitation.
Description
Technical Field
The invention relates to the technical field of offshore oil and gas drilling and production, in particular to a system and a method for testing an underwater wellhead connector in a locking state.
Background
Because of the high degree of land and shallow water oil exploration, oil and gas production has approached a peak, and in the main attack direction of oil and gas exploration, strategic transfer of oil exploration from land, shallow water to deep water sea areas has now been initiated. The global marine oil and gas resources are rich, and the marine oil resources are estimated to account for 34% of the total global oil resources, the accumulated detected reserve is about 400 multiplied by 108t, the detected rate is about 30%, and the method is still in the early stage of exploration.
In recent years, global deep water oil and gas exploration development is rapidly increased, and the deep water yield is increased from less than 30 ten thousand barrels of oil equivalent per day in 1990 to 1030 ten thousand barrels of oil equivalent per day in 2019, and the increase rate is 13%. The global deepwater industry reaches a milestone in 2019 to break through the big gate of 1000 ten thousand barrels/day for the first time. The global deep water industry is expected to continue to grow in the future, and deep water production is expected to reach 1450 thousand barrels per day by 2025. In recent years, most significant oil and gas findings in the world oil and gas exploration field have been located offshore, with more than half of the significant oil and gas findings being deep water findings. The same is true for the development of deep water oil gas in south China sea. The total amount of the oil gas resources in the south China is one third of the total amount of the oil gas resources in the country, and 70% is reserved in the deep water field. However, the exploration and development of China in the south China sea is mainly concentrated in the middle and shallow layers. Therefore, unlocking the oil and gas resources in the deep water and the ultra-deep water in the south sea still needs to continuously overcome the technical problem of offshore oil. Compared with the drilling and completion of land oil and gas fields and offshore shallow water areas, the deep water oil and gas field drilling technology has great difficulty, investment and risk, the related technology and equipment for deep water exploration and development in the south China sea still belong to the world-class problem, and the deep water drilling and production equipment plays an important role in the deep water oil and gas development.
Domestic manufacturers make a breakthrough in deepwater equipment development, and overcome key technologies of research and development of partial equipment, but the national manufacturers generally lack test authentication and technical guarantee due to insufficient knowledge of use purposes, operation indexes and operation environments; the engineering application risk is high, the technical maturity of the forming prototype is low, the whole is in a development stage, the systematicness is insufficient, and the engineering application requirement cannot be met. The underwater wellhead connector is a key device of drilling and production equipment such as an underwater wellhead, an underwater christmas tree or a blowout preventer (BOP), and has the functions of constructing drilling and production channels, preventing high-pressure fluid in the well from leaking, supporting a metal sealing ring and bearing various complex loads. Compared with other underwater connectors, the actual working conditions of the underwater wellhead connector are more complex, mainly comprise installation, production, well drilling and completion, well repairing working conditions and the like, and are also subjected to more severe environmental loads, such as waves, ocean currents, drifting of a drilling ship, circulating internal pressure, tension and bending moment of a marine riser and the like, which seriously threaten the operation safety of the connector, and can cause the functions of the connector to leak, support a metal sealing ring and bear various complex loads when serious.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a system and a method for testing an underwater wellhead connector in a locked state, which can detect the limit load of the underwater wellhead connector in an actual working load simulation state, test the failure of the underwater wellhead connector, verify the safety and reliability of the underwater wellhead connector, and prevent the economic loss caused by the failure of the underwater wellhead connector.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
The invention provides a test system for an underwater wellhead connector in a locking state, which comprises an upper test pile, a lower test pile and a lower test pile, wherein the upper test pile is used for sealing an upper interface of the underwater wellhead connector;
The high-pressure wellhead testing pile is used for sealing a lower interface of the underwater wellhead connector, and an oil filling port is arranged at the bottom of the high-pressure wellhead testing pile;
The hydraulic power loading system is connected with the upper test pile and is used for applying load to the upper test pile;
the hydraulic pump is connected with the hydraulic power loading system and the oil filling port;
the data acquisition and control system is electrically connected with the hydraulic pump and is used for controlling the magnitude and the direction of the output load of the hydraulic power loading system and recording the load value; the data acquisition and control system is used for controlling the hydraulic pump to inject hydraulic oil into the underwater wellhead connector and performing pressure maintaining operation, and simultaneously recording the hydraulic numerical value.
Further, the underwater wellhead connector further comprises a locking device, the locking device is used for locking the high-pressure wellhead testing pile and the upper testing pile, the locking device is arranged on the inner side wall of the upper connector or the inner side wall of the lower connector, and the hydraulic pump is connected with a hydraulic channel in the underwater wellhead connector and used for controlling the locking device to lock the high-pressure wellhead testing pile.
Further, the underwater wellhead connector further comprises a centering seat, a supporting ring, a center ring and an outer body, wherein the centering seat is used for guiding when the underwater wellhead connector is in butt joint with a high-pressure wellhead testing pile, the supporting ring is fixed on the centering seat, the center ring is fixed on the supporting ring, the outer body is fixed on the center ring, and the lower interface penetrate through the centering seat, the supporting ring, the center ring and the outer body;
A cavity is formed between the bottom of the outer body and the center ring, the locking device is arranged in the cavity, and the locking device locks the high-pressure wellhead testing pile along the radial direction; the locking device comprises a sliding block arranged in the cavity and a wedge-shaped locking block matched with the sliding block, an inclined plane is formed at one end of the sliding block, the inclined plane is in sliding fit with a wedge-shaped surface on the wedge-shaped locking block, a mounting hole is formed in the side wall of the outer body, the wedge-shaped locking block is arranged in the mounting hole and slides along the radial direction, a locking channel and an unlocking channel are formed in the side wall of the outer body, when hydraulic oil is introduced into the locking channel, the sliding block pushes the wedge-shaped locking block to slide towards the center and lock the high-pressure wellhead testing pile, when hydraulic oil is introduced into the unlocking channel, the sliding block is pushed to move, the inclined plane is staggered with the wedge-shaped surface, and the locking block is released by the sliding block.
Further, the device further comprises a base, the hydraulic power loading system is fixedly arranged on the base, the hydraulic power loading system comprises a first hydraulic transmission device, a second hydraulic transmission device and a cross beam which are symmetrically arranged on two sides of the underwater wellhead connector, two ends of the cross beam are hinged to the tops of the first hydraulic transmission device and the second hydraulic transmission device respectively, and the bottom of the cross beam is fixedly connected with the upper test pile.
Further, the upper test pile comprises an upper interface and a welding plate, the upper interface is fixedly connected with the welding plate, the lower molded surface of the upper interface is matched with the molded surface of the inner side of the outer body and is inserted into the inner side of the outer body, and the welding plate is fixedly connected with the cross beam.
Further, a sealing ring is further arranged on the inner side wall of the outer body, and is located above the locking block and used for sealing a gap between the upper test pile and the high-pressure wellhead head test pile.
Further, the high-pressure wellhead testing pile comprises a testing pile body and a lower sealing cover, the testing pile body is inserted into the lower connector, the lower sealing cover is fixed at the bottom of the testing pile body, an oil filling port is formed in the lower sealing cover and is connected with the data acquisition and control system, external grooves are formed in the top of the testing pile body, and internal grooves matched with the external grooves are formed in the inner side of the locking block.
Another aspect of the present invention provides a method for testing an underwater wellhead connector in a locked state, based on the testing system, including the steps of:
(1) The hydraulic pump injects hydraulic oil into the locking channel, the sliding block moves downwards, and the high-pressure wellhead testing pile is locked;
(2) Setting a test load, injecting hydraulic oil into the first hydraulic transmission device and the second hydraulic transmission device through the hydraulic pump, and stopping after the set test load is reached;
(3) Setting the pressure required by the test in a data acquisition and control system, injecting hydraulic oil into an oil injection port of a high-pressure wellhead testing pile through a hydraulic pump, maintaining the pressure after the set pressure is reached, and recording the pressure change;
(4) Observing whether the test system has hydraulic oil leakage;
(5) Repeating the steps (2), 3 and 4), changing the load, changing the test pressure, and observing the failure condition of the underwater wellhead connector in the locking state to obtain a pressure load-pressure failure curve.
According to still another aspect of the present invention, there is provided a method for testing an underwater wellhead connector in a locked state, based on the test system, comprising the steps of:
(1) The hydraulic pump injects hydraulic oil into the unlocking channel, drives the sliding block to move downwards, and locks the high-pressure wellhead testing pile;
(2) Setting bending load required by test in a data acquisition and control system, injecting hydraulic oil into a hydraulic transmission device through a hydraulic pump to enable the first hydraulic transmission device to move downwards, enabling a second hydraulic transmission device to move upwards, and enabling a beam to act on an upper test pile to generate bending load and transmitting the bending load to an underwater wellhead connector;
(3) Setting the pressure required by the test in a data acquisition and control system, and injecting hydraulic oil into an oil injection port of the high-pressure wellhead testing pile through a hydraulic pump;
(4) Maintaining the pressure after reaching the specified pressure, recording the pressure change, and observing whether the hydraulic oil leakage exists in the device;
(5) If no change occurs, setting higher test pressure, and repeating (3) and (4) until the pressure is reduced, hydraulic oil leakage occurs or the rated sealing pressure of the underwater wellhead connector is reached, and stopping and repeating;
(6) And (3) repeating the steps (3) and (4) and (5) by changing the loading bending load, and obtaining a bending load-pressure failure curve.
Due to the adoption of the technical scheme, the invention has the following advantages: the invention can realize the matching, locking and sealing of the upper port and the lower port of the underwater wellhead connector, and simulate the working state of the underwater wellhead connector to the maximum extent under the condition of reducing the use of large equipment; the underwater connector locking block can be driven by injection hydraulic pressure, and can move up and down through two hydraulic transmission devices to provide pressure load and bending load for the underwater wellhead connector device; the pressure can be generated inside the cavity of the underwater wellhead connector by injecting hydraulic oil; the data acquisition and control system can realize automatic loading and recording operation of the load, can realize pressure maintaining operation in the cavity of the underwater wellhead connector and record real-time pressure change. The experimental device has the advantages of simple structure and strong repeatability, and can fully test the load failure characteristic received under the locking state of the underwater wellhead connector, thereby ensuring the safety of deep water petroleum exploitation.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Like parts are designated with like reference numerals throughout the drawings.
In the drawings:
FIG. 1 is a schematic structural diagram of an experimental device for testing mechanical properties of an underwater wellhead connector;
Fig. 2 is a schematic view of the wellhead connector provided by the present invention.
Fig. 3 is a schematic structural view of an upper test pile according to the present invention.
Fig. 4 is a schematic structural view of a high-pressure wellhead testing pile provided by the invention.
Reference numerals illustrate:
1-upper test piles; 2-an underwater wellhead connector; 3-testing the pile by the high-pressure wellhead; 4-a base; 5-a first hydraulic transmission; 6, a cross beam; 7-a data acquisition and control system; 8-a hydraulic pump; 101-upper interface; 102-welding a plate; 103-fastening bolts; 201-centering seat; 202-a bolt; 203-a slider; 204-an outer body; 205-unlock the channel; 206-locking the channel; 207-sealing ring; 208-locking piece; 209-a central ring; 210-a support ring; 301-lower interface; 302-an oil filling port.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The embodiment of the invention provides a testing system for an underwater wellhead connector in a locking state, which can detect the limit load of the underwater wellhead connector in failure under the simulated actual working load in the locking state, verify the safety and reliability of the underwater wellhead connector and prevent economic loss caused by the failure of the underwater wellhead connector.
As shown in fig. 1, the test system for the underwater wellhead connector in the locked state includes an upper test pile 1, a high-pressure wellhead test pile 3, a hydraulic power loading system, a data acquisition and control system 7 and a hydraulic pump 8. The upper test pile 1 is used for sealing an upper interface of the underwater wellhead connector 2; the high-pressure wellhead testing pile 3 is used for sealing the lower interface of the underwater wellhead connector 2, and an oil filling port 302 is arranged at the bottom of the high-pressure wellhead testing pile 3; the hydraulic power loading system is connected with the upper test pile 1 and is used for applying load to the upper test pile 1; the hydraulic pump 8 is connected with the hydraulic power loading system and the oil filling port 302; the data acquisition and control system 7 is electrically connected with the hydraulic pump 8, and the data acquisition and control system 7 is used for controlling the magnitude and the direction of the output load of the hydraulic power loading system and recording the load value; the data acquisition and control system 7 is used for controlling the hydraulic pump 8 to inject hydraulic oil into the underwater wellhead connector 2 and perform pressure maintaining operation, and simultaneously records the hydraulic value.
The hydraulic oil is injected into the oil injection port 302, so that the pressure inside the underwater wellhead connector 2 is generated; the data acquisition and control system 7 can realize automatic loading and recording operation of the load, can realize pressure maintaining operation in the underwater wellhead connector 2 and record real-time pressure change. The experimental device is simple in structure and high in repeatability, and can fully test the load failure characteristic received under the locking state of the underwater wellhead connector 2, so that the safety of deep water petroleum exploitation is ensured.
In order to further improve the reliability of test, fix high-pressure wellhead testing stake 3 in the experimental process, under water wellhead connector 2 still includes locking device, locking device is used for locking high-pressure wellhead testing stake, locking device sets up under water the inside wall of wellhead connector 2, data acquisition and control system 7 with under water wellhead connector 2 is connected, is used for controlling locking device locks high-pressure wellhead testing stake 3 prevents the in-process of oiling pressurization, high-pressure wellhead testing stake is to the sealed inefficacy of interface down.
As shown in fig. 2, specifically, the underwater wellhead connector 2 further includes a centering seat 201, a support ring 210, a center ring 209, and an outer body 204, wherein the centering seat 201 is used for guiding when the underwater wellhead connector 2 is docked with a high-pressure wellhead, the support ring 210 is fixed on the centering seat 201, the center ring 209 is fixed on the support ring 210, the outer body 204 is fixed on the center ring 209, and the lower interface penetrate through the centering seat 201, the support ring 210, the center ring 209, and the outer body 204. A sealing ring 207 is further arranged on the inner side wall of the outer body 204, and the sealing ring 207 is located above the locking block 208 and is used for sealing a gap between the upper test pile 1 and the high-pressure wellhead testing pile 3.
A cavity is formed between the bottom of the outer body 204 and the central ring 209, and the locking device is arranged in the cavity and locks the high-pressure wellhead testing pile 3 along the radial direction. The cavity is Z-shaped.
The locking device comprises a sliding block 203 arranged in the cavity and a wedge-shaped locking block 208 matched with the sliding block 203, one end of the sliding block 203 is provided with an inclined plane, the inclined plane is in sliding fit with a wedge-shaped surface on the wedge-shaped locking block 208, the side wall of the outer body 204 is provided with a mounting hole, the wedge-shaped locking block 208 is arranged in the mounting hole and slides along the radial direction, the side wall of the outer body 204 is provided with a locking channel 206 and an unlocking channel 205, when the locking channel 205 is accessed, the sliding block 203 pushes the wedge-shaped locking block 208 to slide towards the center and lock the high-pressure wellhead testing pile 3, when the unlocking channel is accessed with hydraulic oil, the inclined plane is staggered with the wedge-shaped surface, and the sliding block 208 is released.
As shown in fig. 4, the high-pressure wellhead testing pile 3 comprises a testing pile body 301 and a lower sealing cover, the testing pile body 301 is inserted into the lower connector, the lower sealing cover is fixed at the bottom of the testing pile body 301, an oil filling port 302 is formed in the lower sealing cover, the oil filling port 302 is connected with the data acquisition and control system 7, an external tooth pattern is formed at the top of the testing pile body 301, and an internal tooth pattern matched with the external tooth pattern is formed at the inner side of the locking block.
The hydraulic pump 8 is provided with a multi-channel hydraulic injection pipeline which is respectively connected with the hydraulic transmission device, the locking channel 206, the unlocking channel 205 and the oil injection port 302 of the high-pressure wellhead testing pile 3. The data acquisition and control system 7 is connected with the hydraulic pump 8 through a cable.
When a test experiment is carried out, a locking instruction is sent out through the data acquisition and control system 7, hydraulic oil is injected into a locking channel by the hydraulic pump 8, the sliding block 203 is driven to move downwards, the upper side of the sliding block 203 is an inclined plane, the sliding block 203 is matched with the wedge-shaped surface on the outer side of the wedge-shaped locking block 208, the wedge-shaped locking block 208 is driven to move towards the center in a locking mode, and the internal threads of the wedge-shaped locking block 208 are matched with the external threads of the high-pressure wellhead testing pile 3, so that a locking effect is achieved.
After the test experiment is finished, the data acquisition and control system 7 sends an unlocking instruction, the hydraulic pump 8 injects hydraulic oil into the locking channel 206 to drive the sliding block 203 to move upwards, the sliding block 203 is staggered with the wedge surface of the wedge-shaped locking block 208, and the tensioning force of the wedge-shaped locking block 208 is reduced.
Here, the number of the sliding blocks 203 may be two, the two sliding blocks 203 are respectively disposed on two sides of the underwater wellhead connector 2, the two cavities are connected with the locking channel 206 and the unlocking channel 205, and the sliding blocks on two sides are controlled to operate synchronously. As another embodiment, the slider may be provided in a ring shape, the locking channel 206 and the unlocking channel 205 may include only one, and the unlocking channel 205 and the locking channel 206 may be communicated with the cavity and control the slider 203 to move upward or downward.
For convenient installation, the mechanical formation testing system of the underwater wellhead connector under the locking condition further comprises a base 4, and the base 4 is preferably made of I-steel. The hydraulic power loading system is fixedly arranged on the base 4 and comprises a first hydraulic transmission device 5, a second hydraulic transmission device and a cross beam 6 which are symmetrically arranged on two sides of the underwater wellhead connector 2, two ends of the cross beam 6 are respectively hinged with the tops of the first hydraulic transmission device 5 and the second hydraulic transmission device, and the bottom of the cross beam 6 is fixedly connected with the upper test pile 1.
The first hydraulic transmission device 5 and the second hydraulic transmission device are connected with the hydraulic pump, and the hydraulic pump 8 controls the ascending and descending of the first hydraulic transmission device 5 and the second hydraulic transmission device.
As shown in fig. 3, the upper test pile 1 includes an upper interface 101 and a welding plate 102, the upper interface 101 is fixedly connected with the welding plate 102, a lower profile of the upper interface 101 is matched with an inner profile of the outer body 104 and is inserted into the inner side of the outer body 104, and the welding plate 102 is fixedly connected with the cross beam 6. The welding plate 102 is fixed with the cross beam 6 through welding, is fixed with the upper interface 101 through the fastening bolt 103, and the lower profile of the upper interface 101 is matched with the inner profile of the outer body 204 and inserted into the lower profile, and is sealed through the metal sealing ring 207.
The invention also provides a mechanical property testing method of the underwater wellhead connector in the locking state, which adopts the mechanical property testing device of the underwater wellhead connector in the locking state, and the pressure load-pressure property testing method comprises the following steps:
1) The upper test pile 1, the high-pressure wellhead test pile 3 and the underwater wellhead connector 2 are assembled into a whole, the I-steel base 4 is fixed on the ground by bolts, the tested device is placed on the I-steel base 4 and is fixed by bolts, the hydraulic transmission device 5 is welded on the I-steel base 4, and the upright post and the cross beam 6 are installed, so that the cross beam 6 is attached to the welding plate 102;
2) The data acquisition and control system 7 sends a locking instruction, the hydraulic pump 8 injects hydraulic oil into the locking channel 206, drives the piston 203 to move downwards, and the upper side of the piston 203 is provided with an inclined plane which is matched with the inclined plane on the outer side of the locking block to drive the locking block 208 to move towards the center, and the inner side insection of the locking block 208 is matched with the insection of the lower interface 301 to achieve the locking effect;
3) The method comprises the steps that a pressure load required by testing is set in a data acquisition and control system 7, hydraulic oil is injected into hydraulic transmission devices 5 through a hydraulic pump 8, so that the hydraulic transmission devices 5 on two sides move downwards, and then an upright post and a cross beam 6 are driven to move downwards, and the pressure load is generated on an upper test pile 1;
4) Setting the pressure required by the test in the data acquisition and control system 7, and injecting hydraulic oil into the hydraulic injection port 302 of the high-pressure wellhead testing pile 3 through the hydraulic pump 8;
5) After the specified pressure is reached, maintaining the pressure for 15min, recording the pressure change, and observing whether the hydraulic oil leakage exists in the device;
6) If no change occurs, setting higher test pressure, repeating 4) 5) until the pressure is reduced, hydraulic oil leakage occurs or the rated sealing pressure of the underwater wellhead connector 2 is reached, and stopping repeating;
7) Changing the magnitude of the loading pressure load, repeating 3) 4) 5), and obtaining a pressure load-pressure failure curve.
The invention also provides a mechanical property testing method of the underwater wellhead connector in the locking state, which adopts the mechanical property testing device of the underwater wellhead connector 2 in the locking state, and the bending load-pressure property testing method comprises the following steps:
1) The upper test pile 1, the high-pressure wellhead test pile 3 and the underwater wellhead connector 2 are assembled into a whole, the I-steel base 4 is fixed on the ground by bolts, the tested device is placed on the I-steel base 4 and is fixed by bolts, the hydraulic transmission device 5 is welded on the I-steel base 4, and the upright post and the cross beam 6 are installed, so that the cross beam 6 is attached to the welding plate 102;
2) The data acquisition and control system 7 sends a locking instruction, the hydraulic pump 8 injects hydraulic oil into the locking channel 206, drives the piston 203 to move downwards, and the upper side of the piston 203 is provided with an inclined plane which is matched with the inclined plane on the outer side of the locking block to drive the locking block 208 to move towards the center, and the inner side insection of the locking block 208 is matched with the insection of the lower interface 301 to achieve the locking effect;
3) Setting bending load required by test in a data acquisition and control system 7, injecting hydraulic oil into the hydraulic transmission device 5 through a hydraulic pump 8, enabling one side of the hydraulic transmission device 5 to move downwards, enabling the other side of the hydraulic transmission device 5 to move upwards, driving one side of the upright post to move upwards, enabling the other side of the upright post to move downwards, and enabling the transverse beam 6 to act on the upper test pile 1 to generate bending load and transmitting the bending load to the underwater wellhead connector 2;
4) Setting the pressure required by the test in the data acquisition and control system 7, and injecting hydraulic oil into the hydraulic injection port 302 of the high-pressure wellhead testing pile 3 through the hydraulic pump 8;
5) After the specified pressure is reached, maintaining the pressure for 15min, recording the pressure change, and observing whether the hydraulic oil leakage exists in the device;
6) If no change occurs, setting higher test pressure, repeating 4) 5) until the pressure is reduced, hydraulic oil leakage occurs or the rated sealing pressure of the underwater wellhead connector 2 is reached, and stopping repeating;
7) Changing the magnitude of the loading bending load, repeating 3) and 4) and 5) to obtain a bending load-pressure failure curve.
By adopting the testing device and the testing method, the invention can realize the matching, locking and sealing of the upper port and the lower port of the underwater wellhead connector 2, and simulate the working state of the underwater wellhead connector 2 to the maximum extent under the condition of reducing the use of large equipment; the underwater connector locking block can be driven by injection hydraulic pressure, and can move up and down through two hydraulic transmission devices to provide pressure load and bending load for the underwater wellhead connector 2 device; the pressure can be generated in the cavity of the underwater wellhead connector 2 by injecting hydraulic oil; the data acquisition and control system can realize automatic loading and recording operation of the load, can realize pressure maintaining operation in the cavity of the underwater wellhead connector 2, and can record real-time pressure change. The experimental device is simple in structure and high in repeatability, and can fully test the load failure characteristic received under the locking state of the underwater wellhead connector 2, so that the safety of deep water petroleum exploitation is ensured.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A test system for a subsea wellhead connector in a locked condition, comprising:
An upper test stake for sealing an upper interface of the subsea wellhead connector;
The high-pressure wellhead testing pile is used for sealing a lower interface of the underwater wellhead connector, and an oil filling port is arranged at the bottom of the high-pressure wellhead testing pile;
The hydraulic power loading system is connected with the upper test pile and is used for applying load to the upper test pile;
the hydraulic pump is connected with the hydraulic power loading system and the oil filling port;
The data acquisition and control system is electrically connected with the hydraulic pump and is used for controlling the magnitude and the direction of the output load of the hydraulic power loading system and recording the load value; the data acquisition and control system is used for controlling the hydraulic pump to inject hydraulic oil into the underwater wellhead connector and perform pressure maintaining operation, and simultaneously recording the magnitude of hydraulic values;
the hydraulic pump is connected with a hydraulic channel in the underwater wellhead connector and used for controlling the locking device to lock the high-pressure wellhead testing pile;
The underwater wellhead connector further comprises a centering seat, a supporting ring, a center ring and an outer body, wherein the centering seat is used for guiding the underwater wellhead connector when being in butt joint with a high-pressure wellhead testing pile, the supporting ring is fixed on the centering seat, the center ring is fixed on the supporting ring, the outer body is fixed on the center ring, and the upper interface and the lower interface penetrate through the centering seat, the supporting ring, the center ring and the outer body;
A cavity is formed between the bottom of the outer body and the center ring, the locking device is arranged in the cavity, and the locking device locks the high-pressure wellhead testing pile along the radial direction; the locking device comprises a sliding block arranged in the cavity and a wedge-shaped locking block matched with the sliding block, an inclined plane is formed at one end of the sliding block, the inclined plane is in sliding fit with a wedge-shaped surface on the wedge-shaped locking block, a mounting hole is formed in the side wall of the outer body, the wedge-shaped locking block is arranged in the mounting hole and slides along the radial direction, a locking channel and an unlocking channel are formed in the side wall of the outer body, when hydraulic oil is introduced into the locking channel, the sliding block pushes the wedge-shaped locking block to slide towards the center and lock the high-pressure wellhead testing pile, when hydraulic oil is introduced into the unlocking channel, the sliding block is pushed to move, the inclined plane is staggered with the wedge-shaped surface, and the locking block is released by the sliding block.
2. The test system for the underwater wellhead connector in the locked state according to claim 1, further comprising a base, wherein the hydraulic power loading system is fixedly installed on the base, the hydraulic power loading system comprises a first hydraulic transmission device, a second hydraulic transmission device and a cross beam which are symmetrically arranged on two sides of the underwater wellhead connector, two ends of the cross beam are respectively hinged with the tops of the first hydraulic transmission device and the second hydraulic transmission device, and the bottom of the cross beam is fixedly connected with the upper test pile.
3. The test system for a subsea wellhead connector in a locked condition of claim 2, wherein the upper test stake comprises an upper interface and a weld plate, the upper interface being fixedly connected to the weld plate, a lower profile of the upper interface mating with and being inserted into an inner profile of an outer body, the weld plate being fixedly connected to the cross beam.
4. The system for testing a subsea wellhead connector in a locked condition of claim 2, wherein a seal ring is further provided on an inside wall of the outer body, the seal ring being located above the locking piece for sealing a gap between the upper test pile and the high pressure wellhead test pile.
5. The test system for an underwater wellhead connector in a locked state according to claim 2, wherein the high-pressure wellhead test pile comprises a test pile body and a lower cover, the test pile body is inserted into the lower interface, the lower cover is fixed at the bottom of the test pile body, an oil filling port is formed on the lower cover, the oil filling port is connected with the data acquisition and control system, an external tooth pattern is formed at the top of the test pile body, and an internal tooth pattern matched with the external tooth pattern is formed at the inner side of the lock block.
6. A method of testing a subsea wellhead connector in a locked condition, based on the testing system of claim 2, comprising the steps of:
(1) The hydraulic pump injects hydraulic oil into the locking channel, the sliding block moves downwards, and the high-pressure wellhead testing pile is locked;
(2) Setting a test load, injecting hydraulic oil into the first hydraulic transmission device and the second hydraulic transmission device through the hydraulic pump, and stopping after the set test load is reached;
(3) Setting the pressure required by the test in a data acquisition and control system, injecting hydraulic oil into an oil injection port of a high-pressure wellhead testing pile through a hydraulic pump, maintaining the pressure after the set pressure is reached, and recording the pressure change;
(4) Observing whether the test system has hydraulic oil leakage;
(5) Repeating the steps (2), 3 and 4), changing the load, changing the test pressure, and observing the failure condition of the underwater wellhead connector in the locking state to obtain a pressure load-pressure failure curve.
7. A method of testing a subsea wellhead connector in a locked condition, based on the testing system of claim 2, comprising the steps of:
(1) The hydraulic pump injects hydraulic oil into the unlocking channel, drives the sliding block to move downwards, and locks the high-pressure wellhead testing pile;
(2) Setting bending load required by test in a data acquisition and control system, injecting hydraulic oil into a hydraulic transmission device through a hydraulic pump to enable the first hydraulic transmission device to move downwards, enabling a second hydraulic transmission device to move upwards, and enabling a beam to act on an upper test pile to generate bending load and transmitting the bending load to an underwater wellhead connector;
(3) Setting the pressure required by the test in a data acquisition and control system, and injecting hydraulic oil into an oil injection port of the high-pressure wellhead testing pile through a hydraulic pump;
(4) Maintaining the pressure after reaching the specified pressure, recording the pressure change, and observing whether the hydraulic oil leakage exists in the device;
(5) If no change occurs, setting higher test pressure, and repeating (3) and (4) until the pressure is reduced, hydraulic oil leakage occurs or the rated sealing pressure of the underwater wellhead connector is reached, and stopping and repeating;
(6) And (3) repeating the steps (3) and (4) and (5) by changing the loading bending load, and obtaining a bending load-pressure failure curve.
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