Intelligent telescopic compensation wellhead device

Abstract

The present application belongs to the technical field of unconventional oil and gas resource exploitation technologies such as fracturing and heat injection, and discloses an intelligent telescopic compensation wellhead device, which comprises a casing head body, an intelligent telescopic compensation system and a Christmas tree mechanism, the bottom of the casing head body is fixed with a surface casing, the top end of a tubing hanger is fixed with an extension neck, and the top end of the intelligent telescopic compensation system is installed with the Christmas tree mechanism. The device can intelligently and accurately compensate for the displacement of the wellhead by the cooperation of the structures such as the fixed flange, the electric lifting rod and the electric lifting screw, so as to avoid the tearing of the production pipeline. The electric lifting rod drives the electric lifting screw to rotate, drives the telescopic flange and the Christmas tree mechanism above to synchronously lift, cooperates with the rope displacement sensor to monitor the displacement of the wellhead in real time and feeds back signals to the control panel, can automatically adjust the height of the Christmas tree to offset the telescopic amount of the oil layer casing caused by the temperature and pressure changes, and solves the problem that the traditional device cannot automatically compensate, resulting in the tearing of the pipeline under stress.

Description

Technical Field

[0001] This invention belongs to the field of unconventional oil and gas resource extraction technology, such as fracturing and heat injection, and specifically is an intelligent telescopic compensation wellhead device. Background Technology

[0002] In unconventional oil and gas extraction, processes such as fracturing and heating can create complex and variable downhole environments, with significant fluctuations in formation pressure and temperature. This can lead to casing expansion and contraction, which in turn causes wellhead displacement. If this displacement is not effectively managed, the production pipelines on the sides of the Christmas tree are highly susceptible to tearing due to wellhead uplift or descent, resulting in oil and gas leaks. This not only wastes resources but also poses a serious threat to the environment and personnel safety. To ensure the safe and efficient extraction of oil and gas, there is an urgent need for a device that can automatically adapt to casing expansion and contraction and stabilize the wellhead position.

[0003] Traditional casing heads and wellhead assemblies lack the ability to effectively cope with casing expansion and contraction. On the one hand, the bottom inner hole depth of conventional tubing heads is limited. When the casing rises due to pressure or temperature changes, it cannot provide sufficient space for compensation, leading to overall wellhead displacement and affecting the safety of production pipelines. On the other hand, most existing devices lack intelligent monitoring and automatic compensation functions, making it difficult to detect wellhead displacement in real time and adjust the tree height accordingly. Although some devices have simple sealing structures, they perform poorly in terms of pressure bearing capacity and stability, failing to meet the sealing requirements under complex operating conditions. Some thermal recovery casing heads experience unstable sealing during high-temperature steam injection, causing the wellhead and tree to move up and down due to thermal expansion and contraction, affecting oil production efficiency. Most wellhead assemblies are not designed with sufficient consideration for the continuous working life and emergency handling capabilities. When a part malfunctions or encounters an emergency, it is difficult to ensure the continuity of production, reducing the safety factor of the wellhead.

[0004] Therefore, an intelligent telescopic compensation wellhead device is needed to solve the problems of wellhead displacement, high risk of production pipeline tearing, insufficient sealing reliability, lack of emergency support capability, and poor production continuity caused by casing expansion and contraction in unconventional mining scenarios. Summary of the Invention

[0005] To address the problems mentioned in the background section, this invention provides an intelligent telescopic compensation wellhead device.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an intelligent telescopic compensation wellhead device, including a casing head body, an intelligent telescopic compensation system, and a Christmas tree mechanism; The bottom of the casing head body is fixed with a surface casing, the top of the casing head body is fitted with an oil tubing head body, the inside of the casing head body is fitted with an oil layer casing, the inside of the oil layer casing is fitted with a casing slip hanger, the top flange of the oil tubing head body is connected to an intelligent telescoping compensation system, the inside of the oil tubing head body is fitted with an oil tubing hanger, the inside of the oil tubing hanger is fitted with an oil tubing body, the inside of the oil tubing head body has an inner bore, a second instrument flange is fixed to one side of the oil tubing head body, a voltage regulator transmitter is installed at one end of the second instrument flange, an oil sleeve annulus is provided inside the oil layer casing, an extension neck is fixed to the top of the oil tubing hanger, and a Christmas tree mechanism is installed at the top of the intelligent telescoping compensation system. The intelligent telescopic compensation system includes a fixed flange, an electric lifting rod, and an electric lifting screw. The fixed flange is sleeved on the outside of the extension neck. An electric lifting rod is fixed to the top of the fixed flange, and an electric lifting screw is fixed to the top of the electric lifting rod. A telescopic flange is sleeved on the outside of the extension neck. A reserved groove is opened inside the telescopic flange. A first rectangular seal is sleeved on the outside of the extension neck. A T-shaped seal is sleeved on the outside of the extension neck. A first sealing cover is installed at the bottom of the telescopic flange. A first locking bolt is threaded into the inside of the first sealing cover. It also includes a pull-rope displacement sensor, which monitors the wellhead displacement in real time and sends a signal back to the control panel, thereby automatically adjusting the height of the wellhead to offset the expansion and contraction of the casing caused by temperature and pressure changes.

[0007] Preferably, four sets of the second instrument flanges are provided, and the second instrument flanges are symmetrically distributed about the central axis of the oil pipe hanger. A voltage stabilizing transmitter is fixed between two sets of the second instrument flanges.

[0008] Preferably, the electric lifting rod is provided in two sets, and the electric lifting rods are symmetrically distributed about the central axis of the fixed flange. The electric lifting screw and the telescopic flange are threadedly connected. The first locking bolt and the T-type seal are threadedly connected. The first sealing cover and the T-type seal are in contact connection. The height of the reserved groove is higher than that of the oil pipe hanger. The intelligent telescopic compensation system is covered with a dust cover.

[0009] Preferably, the wellhead mechanism includes a manual main valve, an emergency shut-off valve, and a small four-way valve. The manual main valve is bolted to the top of the telescopic flange. The top of the manual main valve is bolted to the emergency shut-off valve. The top of the emergency shut-off valve is bolted to the small four-way valve. The top of the small four-way valve is bolted to a wax removal valve. The top of the wax removal valve is bolted to the wellhead cap. One side of the small four-way valve is bolted to a first instrument flange. A pull rope displacement sensor is fixed to the bottom of the first instrument flange. One end of the pull rope displacement sensor is electrically connected to a control panel. The end of the first instrument flange is bolted to a throttle valve. The bottom of the throttle valve is connected to a production pipeline. A manual telescopic compensation mechanism is provided at the bottom of the production pipeline.

[0010] Preferably, the first instrument flange is provided in two sets, and the first instrument flange is symmetrically distributed about the central axis of the small four-way connector. A pull rope is installed at the bottom end of the pull rope displacement sensor, and a pull rope protective shell is installed on the outside of the pull rope. The end of the pull rope is set on the ground.

[0011] Preferably, the manual telescopic compensation mechanism includes a clamp connector, a limit nut, and a limit rod. The clamp connector is bolted to the outside of the production pipeline. A telescopic outer tube is installed inside the clamp connector. A limit flange is fixed to the outside of the telescopic outer tube. A telescopic inner tube is slidably connected inside the telescopic outer tube. A limit rod is fixed to the top of the outside of the telescopic inner tube. A dustproof O-ring is provided on the outside of the limit rod. A second rectangular seal is provided on the inner wall of the telescopic outer tube. A second sealing cap is installed at the bottom of the telescopic outer tube. A second locking bolt is threaded inside the second sealing cap. A dustproof O-ring is sleeved on the outside of the telescopic inner tube.

[0012] Preferably, four sets of limiting rods are provided, and the limiting rods are arranged in a circular array about the central axis of the telescopic inner tube. The outer surface of the limiting rods is provided with external threads, and the limiting rods and limiting nuts are threaded together.

[0013] Preferably, two sets of dustproof O-rings are provided, with the outer wall of the dustproof O-ring fitting against the inner wall of the telescopic outer tube, the outer wall of the telescopic inner tube fitting against the inner wall of the telescopic outer tube, and the telescopic inner tube and the telescopic outer tube being slidably connected.

[0014] Preferably, the second sealing cap and the second rectangular sealing cap are in contact with each other, the second locking bolt and the telescopic outer tube are threaded together, and four sets of the second locking bolts are arranged in a ring array about the central axis of the telescopic outer tube.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention, through the coordinated use of a fixed flange, an electric lifting rod, and an electric lifting screw, enables the device to intelligently and precisely compensate for wellhead displacement, preventing production pipeline tearing. The fixed flange provides a stable installation base for the electric lifting rod, which drives the electric lifting screw to rotate, causing the telescopic flange and the upper Christmas tree mechanism to rise and fall synchronously. In conjunction with a pull rope displacement sensor, the wellhead displacement is monitored in real time and the signal is fed back to the control panel. The height of the Christmas tree can be automatically adjusted to offset the expansion and contraction of the casing caused by temperature and pressure changes. At the same time, the first rectangular seal and the T-type seal ensure the sealing reliability during the lifting process, solving the problem of pipeline tearing caused by the inability of traditional devices to automatically compensate.

[0016] This invention, through the combination of a manual main valve, an emergency shut-off valve, and a small four-way valve, enables the device to balance production continuity and emergency safety. The double-wing, double-valve design on both sides of the small four-way valve allows switching to the left wing for continuous operation during right-wing maintenance, avoiding downtime that could affect mining efficiency. The manual main valve facilitates routine operation and control, while the emergency shut-off valve can quickly close the wellhead main channel in case of a sudden malfunction, reducing safety risks. At the same time, the wax removal valve at the top of the small four-way valve facilitates regular cleaning of wax in the tubing, ensuring smooth oil and gas transport and improving the overall practicality and safety of the device.

[0017] This invention, through the combination of a clamp connector, a limiting nut, and a limiting rod, enables the device to perform manual telescopic compensation in the event of power outages or other emergencies, ensuring uninterrupted operation. The clamp connector securely connects the telescopic inner and outer tubes to the production pipeline. The telescopic inner tube can slide within the telescopic outer tube to adapt to wellhead displacement. The four sets of annular array limiting rods, in conjunction with the limiting nuts, allow for precise control of the maximum elongation of the compensator by rotating the limiting nuts, adapting to different displacement requirements. The dustproof O-ring and the second rectangular seal prevent impurities such as mud and sand from entering the sealing surface, ensuring sealing performance during manual compensation. As a backup solution for the intelligent compensation system, this invention significantly enhances the device's emergency response capabilities. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 A magnified view of the structure at point A in the middle; Figure 3 This is a schematic diagram of the wellhead mechanism of the present invention; Figure 4 This is a schematic diagram of the intelligent telescopic compensation system of the present invention; Figure 5 This is a schematic diagram of the manual telescopic compensation mechanism of the present invention; Figure 6 This is a cross-sectional structural diagram of the manual telescopic compensation mechanism of the present invention.

[0019] In the diagram: 1. Casing head body; 2. Casing slip hanger; 3. Tubing head body; 4. Tubing head inner bore; 5. Tubing hanger; 51. Extension neck; 6. Intelligent telescopic compensation system; 61. Fixed flange; 62. Electric lifting rod; 63. Electric lifting screw; 64. Telescopic flange; 65. Reserved groove; 66. First rectangular seal; 67. T-seal; 68. First sealing gland; 69. First locking bolt; 7. Christmas tree mechanism; 71. Manual main valve; 72. Emergency shut-off valve; 73. Small four-way valve; 74. Wax removal valve; 75. Christmas tree cap; 76. First instrument flange 8. Manual telescopic compensation mechanism; 81. Clamp connector; 82. Limit nut; 83. Limit rod; 84. Dustproof O-ring; 85. Telescopic outer tube; 86. Limit flange; 87. Second rectangular seal; 88. Second sealing gland; 89. Second locking bolt; 810. Telescopic inner tube; 9. Throttling valve; 10. Pull rope displacement sensor; 101. Pull rope protective shell; 11. Control panel; 12. Oil pipe body; 13. Oil layer casing; 14. Surface casing; 15. Oil sleeve annulus; 16. Voltage stabilizer transmitter; 17. Second instrument flange; 18. Dust cover; 19. Production pipeline. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] like Figures 1 to 6 As shown, the present invention provides an intelligent telescopic compensation wellhead device, including a casing head body 1, an intelligent telescopic compensation system 6, and a Christmas tree mechanism 7.

[0022] like Figures 1 to 6As shown, a surface casing 14 is fixed to the bottom of the casing head body 1, and an oil pipe head body 3 is fitted onto the top of the casing head body 1. An oil layer casing 13 is installed inside the casing head body 1, and a casing slip hanger 2 is installed inside the oil layer casing 13. An intelligent expansion and contraction compensation system 6 is connected to the top flange of the oil pipe head body 3. An oil pipe hanger 5 is installed inside the oil pipe head body 3, and an oil pipe body 12 is installed inside the oil pipe hanger 5. An oil pipe head inner hole 4 is opened inside the oil pipe head body 3. A second instrument flange 17 is fixed on one side of the pipe head body 3. A pressure stabilizing transmitter 16 is installed at one end of the second instrument flange 17. An oil casing annulus 15 is provided inside the oil layer casing 13. An extension neck 51 is fixed at the top of the tubing hanger 5. A tree mechanism 7 is installed at the top of the intelligent telescoping compensation system 6. There are four sets of second instrument flanges 17. The second instrument flanges 17 are symmetrically distributed about the central axis of the tubing hanger 5. A pressure stabilizing transmitter 16 is fixed between two sets of second instrument flanges 17.

[0023] It also includes a pull-rope displacement sensor 10, which monitors the wellhead displacement in real time and feeds back the signal to the control panel 11, thereby automatically adjusting the height of the well tree to offset the expansion and contraction of the casing 13 due to temperature and pressure changes.

[0024] The above scheme is adopted as follows: after the oil layer casing 13 is suspended inside the casing slip hanger 2, it is installed in the inner hole of the casing head body 1. By setting the depth of the inner hole 4 of the oil head to be deeper than that of the oil head body 3, when the oil layer casing 13 rises due to factors such as increased formation pressure or temperature, the oil layer casing 13 will break through the restraint of the casing slip hanger 2 and move upward along the inner hole 4 of the oil head body 3. If the rise of the oil layer casing 13 is not serious, it can compensate for the rise of the oil layer casing 13 while ensuring that the wellhead as a whole does not rise. The oil head body 3 has two wings and two valves on both sides, with the right wing in operation and the left wing as a backup, so that the left wing can be switched to continue operation when the right wing is under maintenance. A pressure stabilizing transmitter 16 is connected to the second instrument flange 17 between the two valves on each wing, which can monitor the temperature and pressure of the annulus 15 in real time.

[0025] like Figures 1 to 4As shown, the intelligent telescopic compensation system 6 includes a fixed flange 61, an electric lifting rod 62, and an electric lifting screw 63. The fixed flange 61 is fitted onto the outside of the extension neck 51. The electric lifting rod 62 is fixed to the top of the fixed flange 61, and the electric lifting screw 63 is fixed to the top of the electric lifting rod 62. A telescopic flange 64 is fitted onto the outside of the extension neck 51. A pre-reserved groove 65 is opened inside the telescopic flange 64. A first rectangular seal 66 and a T-shaped seal 67 are fitted onto the outside of the extension neck 51. The bottom of flange 64 is equipped with a first sealing cover 68, and the first sealing cover 68 is internally threaded with a first locking bolt 69. Two sets of electric lifting rods 62 are provided, and the electric lifting rods 62 are symmetrically distributed about the central axis of the fixed flange 61. The electric lifting screw 63 and the telescopic flange 64 are threadedly connected. The first locking bolt 69 and the T-type seal 67 are threadedly connected. The first sealing cover 68 and the T-type seal 67 are in contact connection. The height of the reserved groove 65 is higher than that of the oil pipe hanger 5. The intelligent telescopic compensation system 6 is covered with a dust cover 18.

[0026] The above scheme is adopted: the extension neck 51 passes through the inner hole of the fixed flange 61 and is inserted into the inner hole of the telescopic flange 64. In order to achieve the sealing between the extension neck 51 and the inner hole of the fixed flange 61 and the telescopic flange 64, a T-type seal 67 and a first rectangular seal 66 are provided between the extension neck 51 and the inner hole. The first rectangular seal 66 is tightened by the first locking bolt 69, which drives the first sealing cover 68 to activate the sealing effect. The reserved groove 65 is used to compensate for the height of wellhead lifting or lowering. The rope end of the pull rope displacement sensor 10 is set on the ground. The linear accuracy of the sensor can reach 0.05%, which can accurately sense the displacement of the Christmas tree mechanism 7 and instantly transmit the signal to the control panel 11. A pull rope protective shell 101 is set on the outside of the pull rope to prevent factors such as strong wind and human factors from affecting the accuracy of the sensor data. After receiving the signal from the pull rope displacement sensor 10, the control panel 11 will instantly control the motor of the electric lifting rod 62 to drive the electric lifting screw 63 to rotate, thereby realizing the lifting compensation of the Christmas tree mechanism 7.

[0027] like Figures 1 to 6As shown, the manual telescopic compensation mechanism 8 includes a clamp connector 81, a limit nut 82, and a limit rod 83. The clamp connector 81 is bolted to the outside of the production pipeline 19. A telescopic outer tube 85 is installed inside the clamp connector 81. A limit flange 86 is fixed to the outside of the telescopic outer tube 85. A telescopic inner tube 810 is slidably connected inside the telescopic outer tube 85. A limit rod 83 is fixed to the top of the telescopic inner tube 810. A dustproof O-ring 84 is provided on the outside of the limit rod 83. A second rectangular seal 87 is provided on the inner wall of the telescopic outer tube 85. A second sealing cap 88 is installed at the bottom of the telescopic outer tube 85. A second locking bolt 89 is threaded inside the second sealing cap 88. A sleeve is fitted on the outside of the telescopic inner tube 810. There are dustproof O-rings 84, and four sets of limiting rods 83 are provided. The limiting rods 83 are arranged in a ring array about the central axis of the telescopic inner tube 810. The outer side of the limiting rods 83 is set with external threads. The limiting rods 83 and the limiting nuts 82 are threaded together. There are two sets of dustproof O-rings 84. The outer wall of the dustproof O-rings 84 is attached to the inner wall of the telescopic outer tube 85. The outer wall of the telescopic inner tube 810 is attached to the inner wall of the telescopic outer tube 85. The telescopic inner tube 810 and the telescopic outer tube 85 are slidably connected. The second sealing cap 88 and the second rectangular seal 87 are in abutting connection. The second locking bolt 89 is threaded to the telescopic outer tube 85. There are four sets of second locking bolts 89. The second locking bolts 89 are arranged in a ring array about the central axis of the telescopic outer tube 85.

[0028] Using the above scheme: When the intelligent telescopic compensation system 6 cannot work due to factors such as power outages, the manual telescopic compensation mechanism 8 will be activated as a temporary backup. The sealing surface of the telescopic inner tube 810 is treated with QPQ to improve surface hardness and corrosion resistance. The upper end of the telescopic inner tube 810 is designed with a dustproof O-ring 84, which can effectively prevent foreign objects such as mud and sand in the gas and liquid produced at the wellhead from entering between the telescopic outer tube 85 and the telescopic inner tube 810, thus protecting the sealing surface. During operation, the telescopic inner tube 810 is connected to the lower production pipeline 19, and the telescopic outer tube 85 is connected to the upper production pipeline 19. When the wellhead is raised or lowered, the telescopic outer tube 85, the limiting flange 86, the second rectangular seal 87, the second sealing gland 88, and the second locking bolt 89 will rise or fall synchronously with the wellhead. The maximum elongation of the compensator can be controlled by rotating and adjusting the position of the limiting nut 82, thereby adapting to the compensation effect at different heights.

[0029] like Figures 1 to 3As shown, the Christmas tree mechanism 7 includes a manual main valve 71, an emergency shut-off valve 72, and a small four-way valve 73. The manual main valve 71 is bolted to the top of the telescopic flange 64. The emergency shut-off valve 72 is bolted to the top of the manual main valve 71. The small four-way valve 73 is bolted to the top of the emergency shut-off valve 72. The wax removal valve 74 is bolted to the top of the small four-way valve 73. The Christmas tree cap 75 is bolted to the top of the small four-way valve 73. A first instrument flange 76 is bolted to one side of the small four-way valve 73. A pull rope is fixed to the bottom of the first instrument flange 76. The displacement sensor 10 is electrically connected to a control panel 11 at one end. A throttle valve 9 is bolted to the end of the first instrument flange 76. The bottom end of the throttle valve 9 is connected to a production pipeline 19. A manual telescopic compensation mechanism 8 is provided at the bottom end of the production pipeline 19. Two sets of first instrument flanges 76 are provided, symmetrically distributed about the central axis of the small four-way connector 73. A pull rope is installed at the bottom end of the pull rope displacement sensor 10. A pull rope protective shell 101 is installed on the outside of the pull rope. The end of the pull rope is set on the ground.

[0030] The above scheme is adopted: by connecting the telescopic flange 64 to the manual main valve 71, and extending the extension neck 51 through the fixed flange 61 into the telescopic flange 64, the extension neck 51 can extend and retract within the fixed flange 61 and the telescopic flange 64 by using a combination of the first rectangular seal 66 and the T-type seal 67. When the inner hole at the bottom of the tubing head body 3 is insufficient to compensate for the lifting distance of the oil layer casing 13, the pull rope displacement sensor 10 automatically senses the wellhead lifting or lowering and immediately transmits the signal to the control panel 11. After receiving the signal, the control panel 11 controls the left and right electric lifting rods 62 to rotate synchronously, driving the Christmas tree mechanism 7 to lower or raise by the same distance, keeping the height of the Christmas tree mechanism 7 unchanged. Furthermore, by setting a dust cover 18 on the outside of the intelligent telescopic compensation system 6, dust prevention and protection are provided by the dust cover 18. The upper part of system 6 is sequentially connected to a manual main valve 71, an emergency shut-off valve 72, a small four-way valve 73, a wax removal valve 74, and an oil production tree cap 75. When the parts above the emergency shut-off valve 72 are being inspected, the emergency shut-off valve 72 can be closed, thereby closing the main wellhead channel and ensuring safety. The small four-way valve 73 has two wings and two valves on both sides. The right wing is the conventional production outlet, and the left wing is a spare. This ensures that when the right wing is being inspected, the valve can be switched to the left wing for continuous production, ensuring the long-term continuous operation of the entire production process and improving the continuous working life of the wellhead. At the same time, throttle valves 9 are installed at the ends of the wings on both sides of the first instrument flange 76, which can be used to change the nozzles to adjust the flow and pressure according to actual production needs. The manual telescopic compensation mechanism 8 installed on the production pipeline 19 can be used to manually adjust the flow extension and contraction when the intelligent telescopic compensation system fails to work due to a sudden power outage at the well site, protecting the production pipeline 19 from damage.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An intelligent telescopic compensation wellhead device, comprising a casing head body (1), characterized in that: It also includes an intelligent telescopic compensation system (6) and a tree structure (7); The bottom of the casing head body (1) is fixed with a surface casing (14), and the top of the casing head body (1) is fitted with an oil pipe head body (3). An oil layer casing (13) is installed inside the casing head body (1), and a casing slip hanger (2) is installed inside the oil layer casing (13). The top flange of the oil pipe head body (3) is connected to an intelligent expansion compensation system (6), and an oil pipe hanger (5) is installed inside the oil pipe head body (3). The unit is provided with a tubing body (12), the tubing head body (3) has an inner hole (4) inside, a second instrument flange (17) is fixed on one side of the tubing head body (3), a voltage regulator transmitter (16) is installed at one end of the second instrument flange (17), an annulus (15) is provided inside the oil layer casing (13), an extension neck (51) is fixed at the top of the tubing hanger (5), and a tree mechanism (7) is installed at the top of the intelligent telescoping compensation system (6). The intelligent telescopic compensation system (6) includes a fixed flange (61), an electric lifting rod (62), and an electric lifting screw (63). The fixed flange (61) is sleeved on the outside of the extension neck (51). The electric lifting rod (62) is fixed at the top of the fixed flange (61), and the electric lifting screw (63) is fixed at the top of the electric lifting rod (62). The telescopic flange (64) is sleeved on the outside of the extension neck (51). A reserved groove (65) is opened inside the telescopic flange (64). A first rectangular seal (66) is sleeved on the outside of the extension neck (51). A T-shaped seal (67) is sleeved on the outside of the extension neck (51). A first sealing cover (68) is installed at the bottom of the telescopic flange (64). A first locking bolt (69) is threaded inside the first sealing cover (68). It also includes a pull rope displacement sensor (10), which monitors the wellhead displacement in real time and feeds back the signal to the control panel (11), thereby automatically adjusting the height of the well tree to offset the expansion and contraction of the oil layer casing (13) caused by temperature and pressure changes.

2. The intelligent telescopic compensation wellhead device according to claim 1, characterized in that: The second instrument flange (17) is provided in four sets. The second instrument flange (17) is symmetrically distributed about the central axis of the oil pipe hanger (5). A voltage stabilizing transmitter (16) is fixed between the two sets of the second instrument flange (17).

3. The intelligent telescopic compensation wellhead device according to claim 1, characterized in that: Two sets of electric lifting rods (62) are provided. The electric lifting rods (62) are symmetrically distributed about the central axis of the fixed flange (61). The electric lifting screw (63) and the telescopic flange (64) are threadedly connected. The first locking bolt (69) and the T-type seal (67) are threadedly connected. The first sealing cover (68) and the T-type seal (67) are in contact connection. The height of the reserved groove (65) is higher than that of the oil pipe hanger (5). The intelligent telescopic compensation system (6) is covered with a dust cover (18).

4. The intelligent telescopic compensation wellhead device according to claim 1, characterized in that: The tree structure (7) includes a manual main valve (71), an emergency shut-off valve (72), and a small four-way valve (73). The manual main valve (71) is bolted to the top of the telescopic flange (64). The top of the manual main valve (71) is bolted to the emergency shut-off valve (72). The top of the emergency shut-off valve (72) is bolted to the small four-way valve (73). The top of the small four-way valve (73) is bolted to the wax removal valve (74). The top of the wax removal valve (74) is bolted to the tree cap. 75), the small four-way (73) is bolted to one side of the first instrument flange (76), the bottom end of the first instrument flange (76) is fixed with a pull rope displacement sensor (10), one end of the pull rope displacement sensor (10) is electrically connected to a control panel (11), the end of the first instrument flange (76) is bolted to a throttle valve (9), the bottom end of the throttle valve (9) is connected to a production pipeline (19), and the bottom end of the production pipeline (19) is provided with a manual telescopic compensation mechanism (8).

5. The intelligent telescopic compensation wellhead device according to claim 4, characterized in that: The first instrument flange (76) is provided in two sets. The first instrument flange (76) is symmetrically distributed about the central axis of the small four-way (73). A pull rope is installed at the bottom of the pull rope displacement sensor (10). A pull rope protective shell (101) is installed on the outside of the pull rope. The end of the pull rope is set on the ground.

6. The intelligent telescopic compensation wellhead device according to claim 4, characterized in that: The manual telescopic compensation mechanism (8) includes a clamp connector (81), a limit nut (82), and a limit rod (83). The clamp connector (81) is bolted to the outside of the production pipeline (19). A telescopic outer tube (85) is installed inside the clamp connector (81). A limit flange (86) is fixed to the outside of the telescopic outer tube (85). A telescopic inner tube (810) is slidably connected inside the telescopic outer tube (85). A limit rod (83) is fixed to the top of the telescopic inner tube (810). A dustproof O-ring (84) is provided on the outside of the limit rod (83). A second rectangular seal (87) is provided on the inner wall of the telescopic outer tube (85). A second sealing cap (88) is installed at the bottom of the telescopic outer tube (85). A second locking bolt (89) is threaded inside the second sealing cap (88). A dustproof O-ring (84) is sleeved on the outside of the telescopic inner tube (810).

7. The intelligent telescopic compensation wellhead device according to claim 6, characterized in that: The limiting rod (83) is provided in four sets. The limiting rod (83) is arranged in a ring array about the central axis of the telescopic inner tube (810). The outside of the limiting rod (83) is set with external thread. The limiting rod (83) and the limiting nut (82) are threaded together.

8. The intelligent telescopic compensation wellhead device according to claim 6, characterized in that: Two sets of dustproof O-rings (84) are provided. The outer wall of the dustproof O-ring (84) is attached to the inner wall of the telescopic outer tube (85), and the outer wall of the telescopic inner tube (810) is attached to the inner wall of the telescopic outer tube (85). The telescopic inner tube (810) and the telescopic outer tube (85) are slidably connected.

9. The intelligent telescopic compensation wellhead device according to claim 6, characterized in that: The second sealing cap (88) and the second rectangular seal (87) are in contact connection, the second locking bolt (89) and the telescopic outer tube (85) are threaded connection, the second locking bolt (89) is provided in four sets, and the second locking bolt (89) is distributed in a ring array about the central axis of the telescopic outer tube (85).

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