Environment-friendly thermal recovery wellhead device

Abstract

The invention discloses an environment-friendly thermal recovery wellhead device and relates to the technical field of oil and gas exploitation, the environment-friendly thermal recovery wellhead device comprises a thermal recovery wellhead body and an upper die holder, the bottom end of the thermal recovery wellhead body is fixedly connected with the upper die holder, a lantern ring is arranged on the outer side of the joint of the upper die holder and a lower die holder, an oil tank is arranged at the bottom end of the lantern ring, and the lantern ring is fixedly connected with the oil tank; the pressure change of the oil injection cavity is monitored in real time through a closed-loop pressure compensation mechanism, and when the specific pressure between the sealing sleeve and the sealing face of the upper die base is insufficient due to thermal expansion and cold contraction, the hydraulic oil is dynamically supplemented to recover the pressure, it is ensured that the effective specific pressure is formed between the sealing sleeve and the upper die base all the time; the device is prevented from being flushed open by high-pressure fluid on the medium side, and wellhead medium leakage accidents caused by sealing failure are fundamentally prevented.

Description

Technical Field

[0001] This invention relates to the field of oil and gas production equipment technology, specifically an environmentally friendly thermal recovery wellhead device. Background Technology

[0002] Thermal recovery wellheads are crucial equipment in oil and gas production under high-temperature and high-pressure conditions. Their core function is to control the pressure and flow rate at the wellhead during thermal recovery, and to safely switch between heating and oil (gas) production operations. Globally, heavy oil resources are abundant, such as the Karamay Oilfield and the Gudao Block of the Shengli Oilfield in Xinjiang, China; the Orinoco Heavy Oil Belt in Venezuela; and oil sands resources in Canada. Heavy oil extraction relies on thermal recovery technology, and the thermal recovery wellhead is the core equipment for realizing the thermal recovery process. Cold recovery (such as flowing or pumped oil extraction) cannot effectively extract heavy oil because the high viscosity of crude oil makes it difficult to lift through the wellbore. Thermal recovery heats the oil layer by injecting high-temperature fluids, reducing the viscosity of the crude oil (e.g., from 10,000 mPa·s to below 100 mPa·s), significantly improving its fluidity. The thermal recovery wellhead acts as a "bridge" connecting the surface thermal recovery system and the underground oil layer, ensuring the safe injection of high-temperature fluids and the smooth production of crude oil.

[0003] A search revealed that Chinese patent CN119083937A discloses an electrically heated dual-tube thermal recovery wellhead device with a cleaning mechanism. The device includes a base, a bottom cylinder fixedly mounted on the outside of the base, a connecting cylinder fixedly mounted on the outside of the bottom cylinder, an oil production pipe snapped onto the outside of the connecting cylinder, a straight pipe fixedly mounted on one end of the connecting cylinder, and a square connecting box fixedly mounted on the other end of the straight pipe. This electrically heated dual-tube thermal recovery wellhead device with a cleaning mechanism, in order to reduce sediment formation in crude oil and improve its fluidity, incorporates a stirring assembly. This assembly, in conjunction with a top motor, causes the turbine fan and cylindrical rod to rotate, which in turn, in conjunction with the driving and driven bevel gears, causes the crossbar to rotate, thereby rotating the stirring paddle. This rapid agitation of the oil reduces sediment in the crude oil and improves its flowability.

[0004] The above invention has the following problems:

[0005] While the aforementioned devices can reduce sediment formation and improve the fluidity of crude oil, in thermal oil recovery operations, the wellhead equipment is subjected to cyclic thermal shock loads. During the steam injection phase, high-temperature steam (typically 200-350℃) flows rapidly through the wellbore, causing the wellhead metal components (such as the casing head, Christmas tree body, and flange connection assemblies) to heat up rapidly in a short period, triggering a significant thermal expansion effect. Due to differences in materials and structures, the components undergo asynchronous deformation. After injection stops, the wellhead system loses its heat source and cools rapidly under the influence of ambient temperature and wellbore heat dissipation, causing the metal components to deform in the opposite direction due to thermal contraction. This cyclical thermal expansion and contraction leads to continuous fluctuations in the sealing pressure at the flange connection surface, a gradual decrease in bolt preload, and ultimately, the appearance of micro-gaps between the flange sealing surfaces, disrupting the original sealing condition and causing wellhead media leakage.

[0006] Therefore, those skilled in the art have provided an environmentally friendly thermal recovery wellhead device to solve the problems mentioned in the background art. Summary of the Invention

[0007] The purpose of this invention is to provide an environmentally friendly thermal recovery wellhead device to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] An environmentally friendly thermal recovery wellhead device includes a thermal recovery wellhead body and an upper mold base, with the upper mold base fixedly connected to the bottom end of the thermal recovery wellhead body; a lower mold base, located at the bottom of the upper mold base and connected to it; a sealing mechanism, located outside the connection between the upper and lower mold bases, including a collar, which is used to prevent leakage during the operation of the thermal recovery wellhead; and a circulation mechanism, located at the bottom of the sealing mechanism, including an oil tank and an oil reservoir, with the oil tank located at the bottom end of the collar and the collar fixedly connected to the oil tank, and an oil reservoir inside the oil tank filled with hydraulic oil; and a central processing unit embedded inside the upper surface of the oil tank.

[0010] As a further aspect of the present invention: an oil injection cavity is provided in the lower mold base, and a sealing sleeve is fitted and connected at the connection between the upper mold base and the lower mold base in the oil injection cavity. Oil inlet holes are provided at both ends of the inner wall of the oil injection cavity and are connected to the oil injection cavity. An installation groove is provided in the inner wall of the oil injection cavity, and a pressure sensor is equipped in the installation groove. The pressure sensor is electrically connected to the central processing unit.

[0011] As a further aspect of the present invention: an annular groove is formed on the upper end face of the collar; an oil delivery pipe and an oil pump are provided on the upper end face of the oil tank; an oil pump is fixedly connected to the input end of both the oil delivery pipe and the oil pump, and the oil pump passes through the oil tank to the oil reservoir; an oil delivery pipe is fixedly connected to the output end of both the oil delivery pipe and the oil pump; the other end of the oil delivery pipe is located in the annular groove; and the oil pump and the oil delivery pump are electrically connected to the central processing unit.

[0012] As a further embodiment of the present invention: the inner wall of the collar is provided with a number of oil outlet holes, all of which are connected to the annular groove, and all of which are completely abutted against the corresponding oil inlet holes, and the diameters of the oil inlet holes and the oil outlet holes are the same. The oil outlet holes, the annular groove, the oil inlet holes and the inner wall of the oil injection cavity are completely connected.

[0013] As a further embodiment of the present invention: an external gear ring is fixedly connected to the outer wall of the collar, multiple sets of driven gears are rotatably connected to the outer side of the external gear ring, a driving gear is rotatably connected to the outer side of the external gear ring, a servo motor is fixedly connected to the bottom end of the driving gear, the bottom end of the servo motor is fixedly connected to the upper end face of the oil tank, and the servo motor is electrically connected to the central processing unit.

[0014] As a further embodiment of the present invention: both the driving gear and the driven gear mesh with the external gear ring, and a rotating rod is fixedly connected to the bottom end of each driven gear. The rotating rod passes through the oil tank to the oil reservoir, and a stirrer is fixedly connected to the end of the rotating rod located in the oil reservoir.

[0015] As a further embodiment of the present invention: multiple cooling boxes are fixedly connected to the outer wall of the oil tank. The multiple cooling boxes are arranged at equal intervals. Each cooling box has an air inlet at the end away from the oil tank. Each cooling box is equipped with a cooling fan at the end away from the oil tank. Each cooling box has multiple cooling fins that are fixedly connected through it at the end near the oil tank. The cooling fins penetrate the oil tank into the oil reservoir and are fixedly connected to the oil tank.

[0016] As a further embodiment of the present invention: the outer wall of the oil tank is equipped with an oil inlet pipe and an oil outlet pipe, and the upper end of the oil inlet pipe and the oil outlet pipe are both equipped with a one-way valve.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. Because of the sealing mechanism, the pressure change of the oil injection chamber is monitored in real time through the closed-loop pressure compensation mechanism. When the specific pressure between the sealing sleeve and the upper mold seat is insufficient due to thermal expansion and contraction, hydraulic oil is dynamically added to restore the pressure, ensuring that the sealing sleeve always forms an effective specific pressure with the upper mold seat, avoiding being blown open by the high pressure fluid on the medium side, and fundamentally preventing wellhead medium leakage accidents caused by seal failure.

[0019] To address the periodic thermal expansion and contraction of the upper and lower mold bases due to temperature changes (sudden rise, cooling contraction), the sealing sleeve moves synchronously with the gap and hydraulic oil is dynamically replenished to automatically adapt to the deformation of the metal parts, ensuring that the sealing surface always maintains the rated specific pressure, effectively suppressing the impact of thermal deformation on sealing performance, and maintaining long-term reliable sealing.

[0020] The servo motor drives the collar to rotate, so that the annular groove delivers hydraulic oil evenly to the oil injection chamber through multiple oil inlets. The uniform rotation speed of the drive gear ensures a stable oil inlet rate, ensuring uniform pressure values ​​at all positions in the oil injection chamber, avoiding weak points in the seal caused by insufficient local pressure, and further improving the fit and reliability of the sealing surface.

[0021] The pressure sensor captures pressure changes in real time and automatically triggers the start and stop of the oil pump. It can quickly restore the oil pressure to the preset threshold without manual intervention. It has a fast response speed, high control accuracy, and reduces human operation error.

[0022] 2. Because of the circulation mechanism, the oil pump can draw the hydraulic oil in the oil injection chamber and the annular groove back to the oil tank for replacement, avoiding the performance degradation of the hydraulic oil due to prolonged heating. At the same time, the oil extraction volume is less than the oil injection volume of the oil transfer pump, ensuring that the oil injection chamber is always full of oil. This achieves oil renewal without affecting the pressure compensation effect, extending the service life of the hydraulic oil, ensuring the long-term stable operation of the system and playing an energy-saving role.

[0023] The agitator increases the turbulence intensity and circulation speed of the hydraulic oil in the oil tank by forcibly stirring, making the oil heated more evenly and avoiding local overheating. At the same time, the distributed heat dissipation fins work with the cooling box to form an efficient heat exchange interface. Combined with the forced convection of the axial flow fan, the residual heat absorbed by the hydraulic oil can be quickly dissipated to the outside, achieving effective control of the oil temperature and preventing the oil performance from deteriorating due to long-term heating.

[0024] The heat dissipation fins adopt a gradient uniform cooling design to avoid sudden viscosity changes or molecular structure damage to the hydraulic oil due to rapid cooling, ensuring the stability of its physical properties (such as fluidity and sealing). At the same time, the synergistic effect of stirring circulation and heat dissipation creates a dynamic thermal balance system, reducing the probability of oil aging and oxidation due to high temperature, significantly extending the service life of the hydraulic oil, reducing maintenance costs and playing an energy-saving role. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of an environmentally friendly thermal recovery wellhead device.

[0026] Figure 2 This is a schematic diagram of the connection between the sealing mechanism and the upper mold base in an environmentally friendly thermal wellhead device.

[0027] Figure 3This is a schematic diagram of the connection between the upper mold base, the lower mold base, and the sealing mechanism in an environmentally friendly thermal recovery wellhead device.

[0028] Figure 4 This is a schematic diagram of the connection between the upper and lower mold bases in an environmentally friendly thermal wellhead device.

[0029] Figure 5 This is a schematic diagram of the structure of the collar and the inside of the oil tank in an environmentally friendly thermal recovery wellhead device.

[0030] Figure 6 This is a schematic diagram of the sealing mechanism and circulation mechanism in an environmentally friendly thermal recovery wellhead device.

[0031] Figure 7 This is a schematic diagram of the external toothed ring in an environmentally friendly thermal recovery wellhead device.

[0032] Figure 8 This is a schematic diagram of the internal structure of the cooling box in an environmentally friendly thermal wellhead device.

[0033] In the diagram: 1. Thermal wellhead body; 2. Upper mold base; 301. Lower mold base; 302. Oil injection chamber; 303. Sealing sleeve; 304. Oil inlet; 305. Mounting groove; 306. Pressure sensor; 4. Sealing mechanism; 401. Collar; 402. Central processing unit; 403. Oil outlet; 404. Annular groove; 405. Oil pump; 406. Oil pump; 407. Oil suction pipe; 408. Oil delivery pipe; 409. External gear ring; 410. Driven gear; 411. Drive gear; 412. Servo motor; 413. Rotating rod; 414. Agitator; 5. Circulation mechanism; 501. Oil tank; 502. Oil reservoir; 503. Cooling box; 504. Heat dissipation fins; 505. Cooling fan. Detailed Implementation

[0034] 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.

[0035] Reference Figures 1-8An environmentally friendly thermal recovery wellhead device is provided, including a thermal recovery wellhead body 1 and an upper mold base 2. The upper mold base 2 is fixedly connected to the bottom end of the thermal recovery wellhead body 1. A lower mold base 301 is located at the bottom of the upper mold base 2 and connected to it. A sealing mechanism 4 is located outside the connection between the upper mold base 2 and the lower mold base 301. The sealing mechanism 4 includes a collar 401, which is provided on the outside of the connection between the upper mold base 2 and the lower mold base 301. The sealing mechanism 4 is used to prevent leakage during the operation of the thermal recovery wellhead. A circulation mechanism 5 is located at the bottom of the sealing mechanism 4. The circulation mechanism 5 includes an oil tank 501 and an oil reservoir 502. The oil tank 501 is located at the bottom end of the collar 401 and is fixedly connected to the collar 401. An oil reservoir 502 is provided inside the oil tank 501. The oil tank 502 is filled with hydraulic oil; the upper end face of the oil tank 501 is embedded with a central processing unit 402; the sealing mechanism 4 also includes an annular groove 404, an oil suction pipe 407, an oil delivery pipe 408, an oil suction pump 406, and an oil delivery pump 405. The upper end face of the collar 401 is provided with an annular groove 404. The upper end face of the oil tank 501 is equipped with an oil delivery pipe 408 and an oil suction pump 406. The input ends of the oil delivery pipe 408 and the oil suction pump 406 are both fixedly connected to the oil suction pipe 407, and the oil suction pipe 407 passes through the oil tank 501 to the oil tank 502. The output ends of the oil delivery pipe 408 and the oil suction pump 406 are both fixedly connected to the oil delivery pipe 408. The other end of the oil delivery pipe 408 is located in the annular groove 404. The oil suction pump 406 and the oil delivery pump 405 are electrically connected to the central processing unit 402.

[0036] During the operation of the thermal wellhead body 1, the pressure sensor 306 installed in the groove 305 of the oil injection chamber 302 of the lower mold base 301 continuously monitors the pressure in the oil injection chamber 302 in real time. When a gap is generated between the upper mold base 2 and the lower mold base 301 due to thermal deformation (thermal expansion and contraction), the sealing sleeve 303 will move upward synchronously with the gap. Accompanying the upward movement of the sealing sleeve 303, the effective volume of the oil injection chamber 302 increases linearly, while the total amount of hydraulic oil in the oil injection chamber 302 remains constant. According to mechanical principles, the pressure value inside the oil cavity will decrease accordingly. This pressure change signal is captured in real time by the pressure sensor 306. At this time, although the sealing sleeve 303 has floated up with the gap and formed an initial fit with the upper mold seat 2, the hydraulic driving force inside the oil injection cavity 302 has been significantly reduced, which cannot guarantee that the sealing sleeve 303 and the sealing surface of the upper mold seat 2 form an effective specific pressure. Under this working condition, the sealing sleeve 303 is very easy to be blown open by the high pressure fluid (gas or liquid) on the medium side, resulting in sealing failure and ultimately causing a wellhead medium leakage accident.

[0037] When the pressure sensor 306 detects a pressure attenuation signal in the oil injection chamber 302, it triggers an electrical signal command transmission to the oil pump 405. Upon receiving the control signal, the oil pump 405 immediately starts, drawing hydraulic oil from the oil tank 501's oil compartment 502 into the annular groove 404 at the upper end of the collar 401 via the oil extraction pipe 407 connected to the input end and the oil delivery pipe 408 connected to the output end. The hydraulic oil then flows through the oil outlet 403 of the annular groove 404 and the lower mold base 301. The oil inlet hole 304 on the outer wall flows into the oil injection chamber 302 of the lower mold base 301 (the annular groove 404, oil outlet hole 403, oil inlet hole 304 and oil injection chamber 302 are interconnected), realizing the dynamic replenishment of hydraulic oil in the oil injection chamber 302. This process can quickly increase the pressure value in the oil chamber to the preset threshold. When the pressure sensor 306 detects that the oil pressure has recovered to the set parameter, it immediately sends a stop signal to the oil pump 405. After receiving the command, the oil pump 405 terminates the oil delivery operation.

[0038] Through this closed-loop pressure compensation mechanism, it is possible to ensure that the sealing surface of the sealing sleeve 303 and the upper mold seat 2 always maintains the rated specific pressure, realize the axial dynamic compensation function of the sealing ring, effectively suppress the periodic thermal expansion and contraction of metal parts caused by sudden temperature rise and cooling contraction after stopping injection, thereby eliminating the hidden danger of medium leakage at the connection surface between the upper mold seat 2 and the lower mold seat 301.

[0039] The oil pump 406 draws the hydraulic oil from the annular groove 404 back to the oil tank 502 of the oil tank 501 through the oil delivery pipe 408, thereby replacing the hydraulic oil and preventing it from being heated for a long time in the oil filling chamber 302, which would affect the service life of the hydraulic oil. The oil pump 406 draws less oil than the oil delivery pump 405 injects oil, so the oil injection volume is greater than the oil drawing volume. Because the hydraulic oil in the oil filling chamber 302 is always full, the oil inflow into the oil filling chamber 302 and the annular groove 404 is greater than the oil outflow. Therefore, the oil pressure in the oil filling chamber 302 will continue to rise steadily, and there will be no imbalance between the oil inflow and outflow.

[0040] Reference Figures 1-4 The lower mold base 301 has an oil injection cavity 302. A sealing sleeve 303 is fitted and connected at the connection between the upper mold base 2 and the lower mold base 301 in the oil injection cavity 302. Oil inlet holes 304 are provided at both the left and right ends of the inner wall of the oil injection cavity 302 and are connected to the oil injection cavity 302. An installation groove 305 is provided on the inner wall of the oil injection cavity 302. A pressure sensor 306 is equipped in the installation groove 305 and is electrically connected to the central processing unit 402.

[0041] The sealing sleeve 303 is fitted at the connection between the lower mold base 301 and the upper mold base 2 to prevent leakage between the lower mold base 301 and the upper mold base 2.

[0042] Reference Figure 1 ,2 3, 5, 6 and Figure 7 The inner wall of the collar 401 is provided with several sets of oil outlet holes 403, all of which are connected to the annular groove 404. Each oil outlet hole 403 is completely abutted against a corresponding oil inlet hole 304, and the diameters of the oil inlet hole 304 and the oil outlet hole 403 are the same. The oil outlet holes 403, the annular groove 404, the oil inlet holes 304, and the inner wall of the oil injection chamber 302 are completely interconnected. An external gear ring 409 is fixedly connected to the outer wall of the collar 401. Multiple sets of driven gears 410 are rotatably connected to the outer side of the external gear ring 409. A drive gear 411 is connected to the oil tank 501. A servo motor 412 is fixedly connected to the bottom end of the drive gear 411. The bottom end of the servo motor 412 is fixedly connected to the upper end face of the oil tank 501. The servo motor 412 is electrically connected to the central processing unit 402. The drive gear 411 and the driven gear 410 both mesh with the external gear ring 409. A rotating rod 413 is fixedly connected to the bottom end of each driven gear 410. The rotating rod 413 passes through the oil tank 501 and extends into the oil reservoir 502. A stirrer 414 is fixedly connected to the end of the rotating rod 413 located in the oil reservoir 502.

[0043] When the oil pump 405 starts, the central processing unit 402 sends a signal to the servo motor 412. The servo motor 412 starts and drives the drive gear 411 to rotate. The drive gear 411 drives the outer gear ring 409 to rotate. The outer gear ring 409 drives the collar 401 to rotate, so that the oil inlet hole 304 on the outer wall of the collar 401 coincides with the oil inlet hole 304 of the lower mold base 301. This allows the oil inlet hole 304 to uniformly deliver hydraulic oil to each oil inlet hole 304, so that the hydraulic oil can enter the oil injection chamber 302 from each position, ensuring that the pressure value at each position in the oil injection chamber 302 is uniform.

[0044] It should be added that the drive gear 411 is driven by the servo motor 412, which ensures that the rotation speed of the external gear ring 409 is uniform, so that the hydraulic oil enters the oil injection chamber 302 through each oil inlet hole 304 at a uniform speed.

[0045] Reference Figure 1 , 2 3, 5, 6 and Figure 8 The outer wall of the oil tank 501 is fixedly connected to multiple sets of cooling boxes 503, which are arranged at equal intervals. Each set of cooling boxes 503 has an air inlet at the end away from the oil tank 501. Each set of cooling boxes 503 is equipped with a cooling fan 505 at the end away from the oil tank 501. Each set of cooling fins 504 is fixedly connected through and through the end of the cooling box 503 near the oil tank 501. The cooling fins 504 penetrate through the oil tank 501 into the oil reservoir 502 and are fixedly connected to the oil tank 501. The outer wall of the oil tank 501 is equipped with an oil inlet pipe and an oil outlet pipe. Each oil inlet pipe and oil outlet pipe is equipped with a one-way valve at the upper end.

[0046] When the external gear ring 409 rotates, it drives multiple sets of driven gears 410 to operate synchronously through gear meshing transmission. The driven gears 410 transmit torque to the bottom rotating rod 413, causing the rotating rod 413 to rotate coaxially. The agitator 414 connected to the output end of the rotating rod 413 then performs a circular motion, which forms a forced stirring effect on the hydraulic oil flowing back to the oil tank 502. This can significantly improve the turbulence intensity of the hydraulic oil in the oil tank 502 and accelerate its overall circulation speed.

[0047] The cooling box 503 distributed on the outer wall of the oil tank 501 has built-in heat dissipation fins 504, which form a heat exchange interface with the hydraulic oil in the oil tank 502 through heat conduction. The fins, as an efficient heat transfer medium, continuously absorb the residual heat in the hydraulic oil. Multiple sets of axial flow cooling fans 505 configured at the top of the cooling box 503 form forced convection, which quickly dissipates the heat accumulated in the fins to the external environment through air heat exchange, thereby maintaining the heat exchange efficiency of the heat dissipation fins 504 in a stable state.

[0048] It should be added that the distributed heat exchange structure adopted by the 504 heat dissipation fins can achieve gradient and uniform cooling of hydraulic oil temperature, avoiding sudden changes in oil viscosity and destruction of molecular structure caused by rapid cooling, effectively ensuring the physical performance stability and service life of hydraulic oil. At the same time, through the synergistic effect of stirring to enhance circulation and fin heat dissipation, a dynamic thermal balance system for hydraulic oil is constructed, providing reliable temperature control guarantee for its long-term stable operation.

[0049] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0050] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An environmentally friendly thermal recovery wellhead device, characterized in that, include; Thermal recovery wellhead body (1), the thermal recovery wellhead body (1) is used to collect oil and gas; Upper mold base (2), the bottom end of the thermal wellhead body (1) is fixedly connected to the upper mold base (2); The lower mold base (301) is located at the bottom of the upper mold base (2) and is connected to the upper mold base (2); The sealing mechanism (4) is located on the outside of the connection between the upper mold base (2) and the lower mold base (301). The sealing mechanism (4) includes a collar (401). The collar (401) is provided on the outside of the connection between the upper mold base (2) and the lower mold base (301). The sealing mechanism (4) is used to prevent leakage at the thermal wellhead during operation. The sealing mechanism (4) is used to prevent leakage at the connection between the upper mold base (2) and the lower mold base (301). The circulation mechanism (5) is located at the bottom of the sealing mechanism (4). The circulation mechanism (5) includes an oil tank (501) and an oil reservoir (502). The bottom end of the collar (401) is provided with an oil tank (501) and the collar (401) is fixedly connected to the oil tank (501). An oil reservoir (502) is opened inside the oil tank (501) and is filled with hydraulic oil. The circulation mechanism (5) is used to cool the hydraulic oil in the oil reservoir (502) and to replace the hydraulic oil in the collar (401) and the hydraulic oil in the oil reservoir (502). The central processing unit (402) is embedded inside the upper surface of the fuel tank (501).

2. The environmentally friendly thermal recovery wellhead device according to claim 1, characterized in that, The lower mold base (301) is provided with an oil injection cavity (302), and a sealing sleeve (303) is provided at the connection between the upper mold base (2) and the lower mold base (301) in the oil injection cavity (302).

3. The environmentally friendly thermal recovery wellhead device according to claim 2, characterized in that, The oil injection chamber (302) has oil inlet holes (304) at both ends of its inner wall and the oil inlet holes (304) are connected to the oil injection chamber (302). The inner wall of the oil injection chamber (302) has an installation groove (305) and a pressure sensor (306) is installed in the installation groove (305). The pressure sensor (306) is electrically connected to the central processing unit (402).

4. The environmentally friendly thermal recovery wellhead device according to claim 1, characterized in that, The sealing mechanism (4) further includes an annular groove (404), an oil extraction pipe (407), an oil delivery pipe (408), an oil extraction pump (406), and an oil delivery pump (405). The upper end face of the collar (401) is provided with an annular groove (404). The upper end face of the oil tank (501) is equipped with an oil delivery pipe (408) and an oil extraction pump (406). The input ends of the oil delivery pipe (408) and the oil extraction pump (406) are all fixedly connected to the oil extraction pipe (407), and the oil extraction pipe (407) passes through the oil tank (501) to the oil reservoir (502). The output ends of the oil delivery pipe (408) and the oil extraction pump (406) are all fixedly connected to the oil delivery pipe (408). The other end of the oil delivery pipe (408) is located in the annular groove (404). The oil extraction pump (406) and the oil delivery pump (405) are electrically connected to the central processing unit (402).

5. The environmentally friendly thermal recovery wellhead device according to claim 1, characterized in that, The sealing mechanism (4) also includes an oil outlet (403), an external gear ring (409), a driven gear (410), a driving gear (411), a servo motor (412), a rotating rod (413), and a stirrer (414). The inner wall of the collar (401) is provided with several sets of oil outlet holes (403). The oil outlet holes (403) are all connected to the annular groove (404). The oil outlet holes (403) are all completely abutted against the corresponding oil inlet holes (304), and the diameters of the oil inlet holes (304) and the oil outlet holes (403) are the same. The inner walls of the oil outlet holes (403), the annular groove (404), the oil inlet holes (304), and the oil injection chamber (302) are completely connected.

6. The environmentally friendly thermal recovery wellhead device according to claim 5, characterized in that, An external gear ring (409) is fixedly connected to the outer wall of the collar (401). Multiple sets of driven gears (410) are rotatably connected to the outer side of the external gear ring (409). A driving gear (411) is rotatably connected to the outer side of the external gear ring (409). A servo motor (412) is fixedly connected to the bottom end of the driving gear (411). The bottom end of the servo motor (412) is fixedly connected to the upper end face of the oil tank (501). The servo motor (412) is electrically connected to the central processing unit (402).

7. An environmentally friendly thermal recovery wellhead device according to claim 56, characterized in that, The driving gear (411) and driven gear (410) are both meshed with the external gear ring (409). The bottom end of the driven gear (410) is fixedly connected to a rotating rod (413). The rotating rod (413) passes through the oil tank (501) to the oil reservoir (502). The end of the rotating rod (413) located in the oil reservoir (502) is fixedly connected to a stirrer (414).

8. The environmentally friendly thermal recovery wellhead device according to claim 1, characterized in that, The circulation mechanism (5) also includes a cooling box (503), heat dissipation fins (504) and a heat dissipation fan (505). Multiple cooling boxes (503) are fixedly connected to the outer wall of the oil tank (501). The multiple cooling boxes (503) are arranged at equal intervals. Each cooling box (503) has an air inlet at the end away from the oil tank (501). Each cooling box (503) is equipped with a heat dissipation fan (505) at the end away from the oil tank (501). Multiple heat dissipation fins (504) are fixedly connected to the end of the cooling box (503) near the oil tank (501). The multiple heat dissipation fins (504) penetrate through the oil tank (501) to the oil reservoir (502) and are fixedly connected to the oil tank (501).

9. An environmentally friendly thermal recovery wellhead device according to claim 8, characterized in that, The outer wall of the oil tank (501) is equipped with an oil inlet pipe and an oil outlet pipe, and the upper end of the oil inlet pipe and the oil outlet pipe are equipped with a one-way valve.

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