Casing hanger PR2 test tool

Abstract

The utility model relates to the technical field of oil pipe hanger testing, in particular to a casing hanger PR2 testing tool which comprises a testing derrick, the testing derrick is in a well shape and used for installing an oil pipe hanger, and when the oil pipe hanger is installed on the testing derrick, a plug is located in an upper pipeline of the oil pipe hanger. The oil pipe assembly is located in a lower pipeline of the oil pipe hanger. The oil pipe hanger and the oil pipe assembly form a sealed pipeline space through the plug; the oil pipe assembly is fixedly connected with the displacement end of the displacement assembly. The stress direction of the oil pipe assembly generated through displacement of the displacement assembly is in the pipeline length direction of the oil pipe hanger. A pressure test opening is formed in the plug, the pressure test opening is used for communicating an external liquid pump with a pipeline space of the tubing hanger, and the external liquid pump introduces liquid into the pipeline space through the pressure test opening. According to the utility model, the technical problems of hanger load cycle test, hanger internal pressure test and hanger temperature and pressure cycle test of the casing hanger according to the PR2 test standard are solved.

Description

Technical Field

[0001] This utility model relates to the field of tubing hanger testing technology, and more specifically, to a casing hanger PR2 testing fixture. Background Technology

[0002] The tubing hanger is a critical wellhead device in petroleum engineering used to support the tubing string and seal the annulus between the tubing and casing. Its safety and reliability directly affect wellhead safety and operational efficiency. Therefore, after the tubing hanger is put into production, it is necessary to simulate extreme working conditions such as downhole high pressure, high temperature, and vibration to test it and verify its structural strength, sealing performance, and functional reliability.

[0003] Currently, with the rapid development of oil and gas exploration and development towards deep wells, ultra-deep wells, shale gas, and high-pressure, high-temperature (HPHT) wells, traditional wellhead equipment can no longer meet the requirements for reliability, safety, and stability. Therefore, API has introduced the more stringent PR2 testing standard to ensure the long-term stability of equipment under extreme conditions. The PR2 testing standard requires simulating extreme environments such as high temperature, high pressure, or complex temperature and pressure alternation to test the safety, reliability, and stability of the equipment.

[0004] Currently, using existing tooling and equipment to perform PR2 testing on casing hangers often faces problems such as cumbersome and complex procedures, low safety factor, and inaccurate test results. Utility Model Content

[0005] The purpose of this application is to provide a PR2 test fixture for casing hangers, which solves the technical problems of performing load cycle testing, internal pressure testing, and temperature and pressure cycle testing of casing hangers according to the PR2 test standard.

[0006] To solve the above-mentioned technical problems, the solution adopted in this application is as follows:

[0007] The PR2 casing hanger test fixture includes a test derrick, plug, and tubing assembly.

[0008] Preferably, the test derrick is shaped like a wellbore and is used to install a tubing hanger. When the tubing hanger is installed on the test derrick, the plug is located in the upper pipe of the tubing hanger, and the tubing assembly is located in the lower pipe of the tubing hanger. The tubing hanger forms a sealed pipe space through the plug and the tubing assembly.

[0009] Preferably, the tubing assembly is fixedly connected to the displacement end of the displacement assembly, and the force generated by the displacement of the tubing assembly through the displacement assembly is along the length of the tubing hanger.

[0010] Preferably, the plug is provided with a pressure test port, which is used to connect the external liquid pump and the pipeline space of the oil pipe hanger. The external liquid pump introduces liquid into the pipeline space through the pressure test port.

[0011] Preferably, a heater is provided on the pipeline between the external liquid pump and the test port.

[0012] Preferably, flanges are provided on the outer edges of the upper and lower ends of the test derrick.

[0013] Preferably, the flange face at the lower end of the test derrick abuts against the flange face of the lower flange, and the flange face at the upper end of the test derrick abuts against the flange face of the upper flange. The upper and lower flanges are respectively locked and fixed to the test derrick by fixing bolts.

[0014] Preferably, annular grooves are provided on the flange surfaces of the upper flange and the lower flange, and gaskets are installed in the annular grooves.

[0015] Preferably, the tubing assembly includes a plug and a tubing. The plug is fixed inside the lower pipe of the tubing hanger, the bottom of the plug is fixedly connected to the upper end of the tubing, and the lower end of the tubing is fixed to the displacement end of the displacement assembly.

[0016] Preferably, the pressure test port extends through the upper flange, and the plug and the pressure test port of the upper flange are connected.

[0017] Preferably, a sealing ring is fitted around the plug of the tubing assembly, and the sealing ring is located between the outer wall of the plug and the inner wall of the tubing hanger.

[0018] Preferably, a sealing ring is also fitted around the plug, and the sealing ring is located between the outer wall of the plug and the inner wall of the pipe of the oil pipe hanger.

[0019] Preferably, the displacement component is configured as a hydraulic cylinder structure, in which a piston is slidably disposed inside the cylinder body, the piston is fixedly connected to the oil pipe of the oil pipe assembly, and the oil pipe slidably passes through the cylinder body.

[0020] The technical solution of this application has at least the following advantages and beneficial effects:

[0021] In this invention, a test derrick is set up to simulate the oil and gas well environment, and the hanger to be tested is fixed in it to simulate the real working environment. The internal pipes of the hanger are sealed by plugs and tubing assemblies. The upper part is connected to the pressure test port and the lower part is connected to the displacement assembly. When the load cycle test is performed, the displacement assembly works to apply a downward load to the hanger to test the load-bearing capacity. When the internal pressure test is performed, the pressure test port is connected to the liquid pump to apply hydraulic pressure to the inside of the hanger to test the pressure bearing capacity. When the temperature and pressure cycle test is performed, the pressure test port is connected to the liquid pump, and the liquid pump is connected to the heater to apply hydraulic pressure and high temperature to the inside of the hanger to simulate the complex temperature and pressure alternation conditions downhole to test the stability.

[0022] In this invention, by setting an upper flange and a lower flange, the planar stability of the test derrick is improved, the test accuracy is increased, and it is also convenient to replace the internal test derrick and tubing hanger through threaded quick-release, making it easier to adapt to the test derrick and tubing hanger testing work of more types of wells. Attached Figure Description

[0023] Figure 1 This is a cross-sectional structural diagram of the present invention.

[0024] In the diagram: 1-Test derrick, 2-Lower flange, 3-Bracket, 4-Upper flange, 5-Fixing bolts, 6-Washer ring, 7-Tubing hanger, 8-Tubing assembly, 9-Plug, 10-Test port, 11-Hydraulic cylinder structure, 12-Sealing ring. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. The terms "center," "upper," "lower," "inner," and "outer," indicating orientation or positional relationships based on the orientation or positional relationships shown in the figures, or the orientation or positional relationships commonly used when the product is in use, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as a limitation on this application. It should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0027] In existing technologies, the PR2 test for subsea casing hangers is a core step in ensuring the safety and reliability of the equipment in extreme deep-sea environments. It verifies the structural integrity, sealing performance (crucial for blowout prevention), material corrosion / fatigue resistance, and installation / recovery functionality of the casing hanger under simulated deep-sea conditions (high pressure, low temperature, corrosion, dynamic loads). Based on API 17D (Subsea Wellhead Equipment Specification) and API 6A (Wellhead Equipment), the main tests for casing hangers include load cycle testing, internal pressure testing, and temperature-pressure cycle testing.

[0028] Example

[0029] Please refer to Figure 1 This utility model provides a test fixture for a casing hanger PR2, including a test derrick 1. The test derrick 1 is shaped like a well passage and is used to simulate the well passage environment in the working environment. A tubing hanger 7 is locked and installed inside the well passage of the test derrick 1. The tubing hanger 7 is the casing hanger to be tested.

[0030] Furthermore, the test derrick 1 is mounted on the lower flange 2, which is mounted on the bracket 3. The bracket 3 supports the entire test fixture. Flanges are provided at both the upper and lower outer edges of the test derrick 1. The flange face at the lower end of the test derrick 1 abuts against the flange face of the lower flange 2, improving the stability of the test derrick 1 installation. The lower flange 2 is locked to the top of the bracket 3 by fixing bolts 5 (i.e., bolts and nuts). The lower flange 2 and the lower flange of the test derrick 1 are also locked together by fixing bolts 5, facilitating the disassembly of the test derrick 1 and allowing for the replacement of test derricks 1 with different wellbore types for testing different types of tubing hangers 7.

[0031] The upper flange 4 is also installed on the upper end of the test derrick 1. The flange face of the upper end of the test derrick 1 abuts against the flange face of the upper flange 4, and the two are locked together by fixing bolts 5.

[0032] Annular grooves are provided on the upper flange 4 and the lower flange 2, and gaskets 6 are installed in the annular grooves. When the upper and lower flanges 2 are locked and fixed to the upper and lower flanges of the test well, the gaskets 6 can seal the contact surfaces between the flanges, reducing the impact of flange installation gaps on the subsequent pressure test of the tubing hanger 7.

[0033] Furthermore, a plug 9 is inserted into the upper part of the tubing hanger 7 to seal the upper part of the tubing hanger 7 pipe; a tubing assembly 8 is inserted into the lower part of the tubing hanger 7 to seal the lower part of the tubing hanger 7 pipe, which facilitates the PR2 test work inside the tubing hanger 7 pipe.

[0034] The tubing assembly 8 includes a plug and a tubing. The plug is fixed to the lower part of the tubing in the tubing hanger 7, and the bottom of the plug is fixedly connected to the upper end of the tubing. The lower end of the tubing is fixed to the displacement end of the displacement assembly. When the displacement assembly moves, it will drive the tubing to pull the plug, causing the plug to be under tension and exert a force on the tubing hanger 7, providing a downward weight load for the tubing hanger 7, which facilitates the load cycle test of the tubing hanger 7.

[0035] The lower flange 2 is centrally connected, which ensures that the movement of the plug will not be interfered with by the lower flange 2 when the plug is subjected to the tension of the displacement component.

[0036] Furthermore, a pressure test port 10 is provided on the upper flange 4 and the plug 9, so that the pressure test port 10 is connected to the inside of the pipe of the tubing hanger 7. When the tubing hanger 7 is tested, the pressure test port 10 is connected to the external environment's hydraulic pump, and the pressurized fluid is pumped into the pipe of the tubing hanger 7 through the pressure test port 10 to pressurize the hydraulic fluid inside the pipe, which facilitates the internal pressure test and temperature and pressure cycle test of the tubing hanger 7.

[0037] In order to ensure that the pressure fluid of the test port 10 is only introduced into the pipeline of the tubing hanger 7 (to improve the accuracy of hydraulic testing), a sealing ring 12 is fitted around the plug of the tubing assembly 8. The sealing ring 12 is located between the outer wall of the plug and the inner wall of the pipeline, which increases the sealing performance between the sliding plug and the pipeline of the tubing hanger 7, making it less prone to leakage. A sealing ring 12 is also fitted around the plug 9 located at the top of the pipeline of the tubing hanger 7. The sealing ring 12 is located between the outer wall of the plug 9 and the inner wall of the pipeline, which increases the sealing performance between the plug 9 and the pipeline of the tubing hanger 7, making it less prone to leakage.

[0038] It is worth noting that in this embodiment, the displacement component is configured as a hydraulic cylinder structure 11. A piston is slidably mounted inside the cylinder body of the hydraulic cylinder structure 11. The hydraulic cylinder structure 11 achieves displacement of the piston by pumping fluid into the chambers at both ends of the piston within the cylinder (each chamber is connected to a pump port for pumping operation). The hydraulic cylinder then performs hydraulic operation. The oil pipe assembly 8 slides through the cylinder body and is fixedly connected to the piston. When the piston moves, it drives the oil pipe to move as well, applying tension to the oil pipe hanger 7. A sealing ring 12 is also provided at the point where the oil pipe passes through the cylinder body to reduce leakage.

[0039] In this embodiment, a hydraulic cylinder is used to provide tension for the oil pipe hanger 7 because, compared with the displacement tension generated by the pneumatic cylinder or electric cylinder, the hydraulic cylinder uses hydraulic oil as the medium, has a larger output force and smoother movement, and is more suitable for working environments that require higher stability, larger tension, and higher displacement accuracy. Therefore, the hydraulic cylinder structure 11 is used in the testing work of this embodiment.

[0040] During the cyclic load test of the tubing hanger 7, the displacement component is manually or cyclically opened and closed via a controller. First, the displacement component is opened to apply tension, causing the tubing assembly 8 to apply a downward load to the tubing hanger 7, simulating the weight of the casing borne by the tested tubing hanger 7. Each load application is maintained for at least 5 minutes. Then, the displacement component is closed to stop applying the load, and after maintaining the same time, it is reopened to continue applying the same load. This cycle is repeated to perform the cyclic load test on the tubing hanger 7. After the test is completed, the structure of the tubing hanger 7 is observed for any damage according to the testing specifications specified in the existing product testing manual, thereby determining whether the overall load-bearing capacity of the tubing hanger 7 is qualified.

[0041] During the internal pressure test of the tubing hanger 7, under room temperature conditions, with the displacement component not operating, the test port 10 is manually connected to an external hydraulic pump. Pressure fluid with a fixed hydraulic pressure is introduced into the hanger through the test port 10 to apply a hydraulic load to the pipeline and maintain the hydraulic pressure for 15 minutes. After the test, according to the testing specifications stipulated in the existing product testing manual, the structure of the tubing hanger 7 is observed for damage and leakage to determine whether its sealing performance and pressure-bearing capacity are qualified.

[0042] During the temperature and pressure cycling test of the tubing hanger 7, the displacement component is not activated. The test port 10 is manually connected to an external hydraulic pump, and pressurized fluid with a fixed hydraulic pressure is introduced into the hanger through the test port 10 to apply a hydraulic load to the pipeline. Each load loading and unloading time is at least 5 minutes, during which the temperature of the pressurized fluid is high to simulate the high-temperature and high-pressure downhole environment experienced by the tested tubing hanger 7. When the load is off, the pressurized fluid no longer conducts the high temperature from the pump, so the temperature gradually cools down to room temperature to adapt to the temperature change during the next load loading. After the test is completed, the structure of the tubing hanger 7 is observed for damage and leakage according to the testing specifications specified in the existing product testing manual, in order to determine whether the sealing performance and pressure bearing capacity of the tubing hanger 7 under high temperature and high pressure are qualified.

[0043] It is worth noting that during each load alternation in the temperature-pressure cycle test, the hydraulic pump's pumping pressure was controlled manually or by a controller to vary, with the controlled hydraulic pressure range set within the extreme pressure range that the tubing hanger 7 would encounter downhole. During each load alternation in the temperature-pressure cycle test, the pump's suction port was pumped with pressurized fluid at different temperatures (this could be achieved by manually switching the tubing pipe to different temperature pressurized fluids at the flushing port, or by directly installing a heater at the suction port to heat the pressurized fluid drawn into the pump to different temperatures), with the controlled temperature range set within the extreme temperature range that the tubing hanger 7 would encounter downhole. This test simulates complex temperature and pressure alternation conditions downhole, verifying the stability of the hanger in this complex environment.

[0044] The various embodiments of this utility model have now been described in detail. To avoid obscuring the concept of this utility model, some details known in the art have not been described. Those skilled in the art will fully understand how to implement the technical solution of this utility model based on the above description. The scope of this utility model is defined by the appended claims.

Claims

1. A casing hanger PR2 test fixture, characterized by, The test derrick (1), the plug (9), the tubing assembly (8); The test derrick (1) is in the shape of a well, and the tubing hanger (7) is installed on the test derrick (1), the plug is located in the upper pipe of the tubing hanger (7), and the tubing assembly is located in the lower pipe of the tubing hanger (7); the tubing assembly (8) is fixedly connected to the displacement end of the displacement assembly, and the stress direction generated by the displacement of the displacement assembly is along the length direction of the pipe of the tubing hanger (7); The plug (9) is provided with a pressure test port (10), and the pressure test port (10) is used for connecting the external liquid pump and the pipe space of the tubing hanger (7), and the external liquid pump passes through the pressure test port (10) to pass the liquid into the pipe space. A heater is arranged on the pipeline between the external liquid pump and the pressure test port (10).

2. The casing hanger PR2 test fixture of claim 1, wherein, The upper and lower ends of the test derrick (1) are provided with flanges; 3. The casing hanger PR2 test tool of claim 1, wherein, The flange surface of the lower end of the test derrick (1) abuts against the flange surface of the lower flange (2), and the flange surface of the upper end of the test derrick (1) abuts against the flange surface of the upper flange (4), and the lower flange (2) and the test derrick (1) are locked and fixed by the fixing bolt (5). The flange surface of the upper flange (4) and the lower flange (2) is provided with an annular clamping groove, and a grommet (6) is arranged in the annular clamping groove.

4. The casing hanger PR2 test fixture of claim 3, wherein, The tubing assembly (8) comprises a plug and a tubing, the plug is fixed in the lower pipe of the tubing hanger (7), the bottom of the plug is fixedly connected to the upper end of the tubing, and the lower end of the tubing is fixed to the displacement end of the displacement assembly.

5. The casing hanger PR2 test tool of claim 1, wherein, The pressure test port (10) penetrates the upper flange (4), and the pressure test port (10) of the plug (9) and the upper flange (4) is in communication.

6. The casing hanger PR2 test tool of claim 1, wherein, The plug of the tubing assembly (8) is provided with a sealing ring (12), and the sealing ring (12) is located between the outer wall of the plug and the inner wall of the pipe of the tubing hanger (7); 7. The casing hanger PR2 test tool of claim 1, wherein, The plug (9) is also provided with a sealing ring (12), and the sealing ring (12) is located between the outer wall of the plug (9) and the inner wall of the pipe of the tubing hanger (7). The displacement assembly is arranged in the form of a hydraulic cylinder structure (11), a piston is slidably arranged in the cylinder body of the hydraulic cylinder structure (11), the piston is fixedly connected to the tubing of the tubing assembly (8), and the tubing is slidably arranged in the cylinder body.

8. The casing hanger PR2 test tool of claim 1, wherein, ​

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