Sealing anti-channeling multi-compensation thermal recovery wellhead

Abstract

The invention relates to the technical field of thermal recovery well mouths, and discloses a sealed anti-channeling multi-compensation thermal recovery well mouth which comprises a well mouth device, bolts and nuts, the well mouth device comprises a lower flange and an upper flange, a compensation mechanism is arranged on the circumferential surface of the lower flange, and a temperature control mechanism is arranged on the surface of the compensation mechanism. A boosting mechanism is arranged in the compensation mechanism; the compensation mechanism comprises a supporting plate, an oil box, a first oil pump, a first oil pipe, an annular box, an inner box, a through hole, an oil inlet hole, an oil cavity and a metal sealing ring, the supporting plate is fixedly connected to the circumferential face of the lower flange, the oil box is fixedly connected to the upper surface of the supporting plate, and the first oil pump is fixedly connected to the upper surface of the supporting plate; multiple compensation can be carried out on the flange, and therefore the phenomenon that the flange connecting position leaks due to sudden temperature rise of a wellhead, cooling shrinkage after injection stopping and repeated expansion and shrinkage of metal parts can be prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal recovery wellheads, and particularly to a sealed anti-channeling multiple compensation thermal recovery wellhead. Background Art

[0002] A thermal recovery wellhead generally refers to a wellhead facility used for collecting, processing, and transporting production fluids during the extraction of oil or natural gas. Thermal recovery wellheads are mainly applied to the exploitation of geothermal energy, especially the extraction of geothermal resources with relatively high temperatures. During use, they are generally accompanied by vibration, high pressure, and high temperature.

[0003] The patent with the publication number CN207315289U provides a double-tube thermal recovery wellhead device. The double-tube thermal recovery wellhead device includes a double-tube housing and a seal assembly. The double-tube housing includes: a first longitudinal channel that cooperates with a polished rod seal; a second longitudinal channel separated from the first longitudinal channel; a first transverse channel communicating with the first longitudinal channel, and a first gate valve is provided on the first transverse channel; wherein, the seal assembly is arranged at the opening of the second longitudinal channel, and the seal assembly includes a seal body and a flow-through channel provided on the seal body and communicating with the second longitudinal channel; the double-tube housing further includes a valve port communicating with the second longitudinal channel, and a second gate valve for controlling the on-off of the second longitudinal channel is provided at the valve port. This double-tube thermal recovery wellhead device of the patent can be directly used for continuous coiled tubing operations of lifting and lowering under pressure without disassembling the packing box during pressure-bearing operations. However, during thermal recovery of the above device, the wellhead temperature rises suddenly, and after the injection stops, it cools and shrinks. The metal components expand and contract repeatedly, which easily causes gaps between the flanges and then leakage. Therefore, a sealed anti-channeling multiple compensation thermal recovery wellhead is proposed to solve the above-mentioned problems. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a sealed anti-channeling multiple compensation thermal recovery wellhead aiming at the deficiencies in the above-mentioned prior art.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is: a sealed anti-channeling multiple compensation thermal recovery wellhead, including a wellhead device, bolts and nuts. The wellhead device includes a lower flange and an upper flange. A compensation mechanism is provided on the circumferential surface of the lower flange. A temperature control mechanism is provided on the surface of the compensation mechanism, and a boosting mechanism is provided inside the compensation mechanism. The compensation mechanism includes a support plate, an oil box, an oil pump I, a tubing I, an annular box, an inner box, through holes, oil inlet holes, an oil cavity and a metal sealing ring. The support plate is fixedly connected to the circumferential surface of the lower flange. The oil box is fixedly connected to the upper surface of the support plate. The oil pump I is fixedly connected to the upper surface of the support plate. The tubing I is fixedly communicated with the oil outlet end of the oil pump I. The annular box is fixedly connected to the circumferential surface of the lower flange. The inner box is rotatably connected to the inner wall of the annular box. The through holes are opened on the inner side surface of the inner box. The oil inlet holes are opened on the outer surface of the lower flange and the inner surface of the annular box. The oil cavity is opened inside the lower flange. The metal sealing ring is slidably connected to the inner wall of the oil cavity. A pressure sensor is provided on the inner wall of the oil cavity, and the pressure sensor is electrically connected to the oil pump I. The oil inlet end of the oil pump I is fixedly communicated with the oil box. The compensation mechanism further includes a motor, a gear and a gear ring. The motor is fixedly connected to the top of the oil box. The gear is fixedly connected to the output end of the motor. The gear ring is fixedly connected to the outer surface of the inner box. The motor is electrically connected to the oil pump I. The number of the through holes is two, and the two through holes are symmetrically distributed on the inner side surface of the inner box. One check valve is provided on the inner wall of each of the two through holes, and the installation directions of the two check valves are opposite. One check valve is in the direction from outside to inside, and the other check valve is in the direction from inside to outside. The number of the oil inlet holes is multiple, and the multiple oil inlet holes are circularly arrayed on the outer surface of the lower flange and the inner surface of the annular box. The oil inlet holes on the outer surface of the lower flange are communicated with the oil inlet holes on the inner surface of the annular box. When the oil pump I pumps hydraulic oil into the inner box, the oil pump I also sends an electrical signal to the motor. When the motor receives the electrical signal, it will start and drive the gear to rotate. The gear drives the gear ring to rotate. The gear ring drives the inner box to rotate in the annular box. At this time, the inner box drives the through holes to rotate and intermittently communicate with the multiple oil inlet holes in the lower flange and the annular box in sequence, so that the hydraulic oil in the inner box can be evenly fed into the oil cavity from the multiple oil inlet holes in sequence, so as to evenly increase the oil pressure at each position in the oil cavity, prevent the phenomenon of uneven increase in oil pressure, and further prevent the uneven force of the oil pressure at the bottom of the metal sealing ring, which will affect the compensation effect of the metal sealing ring and further cause the leakage of the wellhead. The end of the tubing I away from the oil pump I is fixedly communicated with the top of the annular box. The circumferential surface of the gear meshes with the circumferential surface of the gear ring. The surface of the gear ring contacts the inner wall outside the annular box, and a sealing member is provided between the gear ring and the annular box.The upper flange and the lower flange are fixed by bolts and nuts. A disc spring group is arranged between the upper flange and the nuts. During the use of the device, the pressure sensor inside the oil chamber will detect the pressure inside the oil chamber in real time. When a gap appears between the lower flange and the upper flange due to thermal expansion and contraction, the metal sealing ring will move up following the size of the gap. After the metal sealing ring moves up, the volume inside the oil chamber increases but the oil quantity remains unchanged. Therefore, the pressure sensor in the oil chamber will detect a decrease in the pressure value. At this time, even if the metal sealing ring moves up following the size of the gap and fits against the upper flange, the reduced oil pressure is difficult to tightly press the metal sealing ring against the bottom of the upper flange, and it is easily driven to open by the high-pressure gas or liquid gushing outwards, thereby causing leakage at the wellhead. When the pressure sensor detects a decrease in pressure, it will send an electrical signal to oil pump one. At this time, after receiving the electrical signal, oil pump one will start and pump the hydraulic oil in the oil box into the inner box through oil pipe one. The hydraulic oil will enter the oil chamber through the interconnected through holes and oil inlet holes, and timely supplement the hydraulic oil in the oil chamber, so that the oil pressure in the oil chamber rises and maintains the preset value. When the pressure sensor detects that the oil pressure has recovered to the preset value, it will send an electrical signal to oil pump one. When oil pump one receives the electrical signal, it will stop working. By supplementing the oil pressure, the metal sealing ring can be tightly fitted against the bottom of the upper flange, and axial compensation of the metal sealing ring can be achieved, thereby preventing the phenomenon of leakage at the flange connection caused by sudden temperature rise at the wellhead, cooling and contraction after injection stop, and repeated expansion and contraction of metal components. At the same time, a disc spring group is installed on the bolts and nuts at the flange connection, so that the bolts can be compensated for thermal expansion and the service life of the bolts can be increased.

[0006] Preferably, the temperature control mechanism includes an oil pump II, an oil pipe II, a heat conducting plate and a cooling fan. The oil pump II is fixedly connected to the upper surface of the support plate. The oil pipe II is fixedly communicated with the oil inlet end of the oil pump II. A plurality of heat conducting plates are provided, and the plurality of heat conducting plates are fixedly connected to the inner wall of the oil box. The cooling fan is installed on the side of the heat conducting plate. The circumferential surface of the oil pipe II is fixedly connected to the inner wall of the top of the annular box. The oil outlet end of the oil pump II is fixedly communicated with one end of the oil box away from the oil pump I. The oil pump II is electrically connected to the oil pump I. When the oil pump I starts, an electrical signal will be sent to the oil pump II. When the oil pump II receives the electrical signal, it will start. The oil pump II will pump out the hydraulic oil in the inner box through the oil pipe II. Since two through holes are provided on the inner side surface of the inner box, and one-way valves in opposite directions are provided in the two through holes, the oil in the inner box enters the oil cavity through the one-way valve in one through hole, and at the same time, the hydraulic oil in the oil cavity is pushed out through the other through hole into the inner box. The hot hydraulic oil entering the inner box will be mixed with the cold hydraulic oil inside it, and driven by the clockwise rotating inner box, the hot hydraulic oil in this area will move to the oil pipe II and be pumped out by the oil pump II, so that the replacement of the hydraulic oil can be completed, preventing the hydraulic oil from being heated for a long time in the oil cavity, thereby affecting the service life of the hydraulic oil. The pumping volume of the oil pump II is lower than the injection volume of the oil pump I, so that the injection volume is greater than the pumping volume. Since the hydraulic oil in the inner box always remains full, the oil inflow in the oil cavity is greater than the oil outflow. Therefore, the oil pressure in the oil cavity will still rise steadily, and there will be no phenomenon of balanced oil inflow and outflow. The pumped hot hydraulic oil will be introduced into the other end of the oil pumping end of the oil box. At this time, the hot hydraulic oil will be pumped to the pumping end by the oil pump I. At this time, the hydraulic oil of the hydraulic cylinder passes through the heat conducting plate. The heat conducting plate will absorb the heat in the hydraulic oil and dissipate the heat under the action of the cooling fan, so that the pumped hot hydraulic oil can be cooled, and the hydraulic oil can be reused repeatedly.

[0007] Preferably, the boosting mechanism includes a pressing plate, an arc plate, a mounting frame, rollers, a sealing shell and a transmission plate. The pressing plate is slidably connected to the inner wall of the top of the oil box through a spring. The arc plate is fixedly connected to the bottom of the gear ring. The mounting frame is fixedly connected to the bottom of the pressing plate. The rollers are rotatably connected to the inner wall of the pressing plate. The transmission plate is rotatably connected to the inner wall of the mounting frame. The sealing shell is fixedly connected to the surface of the mounting frame. A small motor is fixedly connected to the inner wall of the sealing shell. The output end of the small motor is fixedly connected to the transmission plate. The circumferential surface of the roller contacts the arc surface of the arc plate. Valves are arranged on the inner walls of both the second oil pipe and the first oil pipe. The valves are used to close the second oil pipe and the first oil pipe when the second oil pump and the first oil pump are not in use. The valves on the inner walls of the second oil pipe and the first oil pipe are opened and closed together with the second oil pump and the first oil pump. When the gear ring rotates, it will drive the arc plate to rotate. The arc plate pushes the roller downward through the arc surface. The roller drives the pressing plate to move downward. When the pressing plate moves downward, it compresses the spring and drives the mounting frame to move downward. The mounting frame drives the inclined transmission plate to move downward. At this time, the inclined transmission plate will push the hot hydraulic oil in the oil box towards the pumping end and improve the contact efficiency between the hot hydraulic oil and the heat conducting plate. When the arc plate passes over the roller, the compressed spring will drive the pressing plate to move upward and reset. At this time, the small motor in the sealing shell will start and drive the transmission plate to rotate to keep it in a vertical state to prevent it from pushing the hydraulic oil towards the oil inlet end during the upward movement. When the mounting frame is reset, the small motor will drive the transmission plate to rotate and reset towards the oil inlet end again.

[0008] The present invention adopts the above technical solutions and can bring the following beneficial effects: 1. When the device is in use in this sealed anti-channeling multiple compensation thermal recovery wellhead, when the pressure sensor detects a decrease in pressure, it will send an electrical signal to the first oil pump. At this time, after receiving the electrical signal, the first oil pump will start and pump the hydraulic oil in the oil box into the inner box through the first oil pipe. The hydraulic oil will enter the oil cavity through the interconnected through holes and oil inlet holes and timely supplement the hydraulic oil in the oil cavity, so that the oil pressure in the oil cavity rises and remains at the preset value. When the pressure sensor detects that the oil pressure has recovered to the preset value, it will send an electrical signal to the first oil pump. When the first oil pump receives the electrical signal, it will stop working. By supplementing the oil pressure, the metal sealing ring can be tightly attached to the bottom of the upper flange, and the axial compensation of the metal sealing ring can be realized, thus preventing the leakage phenomenon at the flange connection caused by the sudden temperature rise at the wellhead, the cooling and contraction after stopping injection, and the repeated expansion and contraction of metal components. At the same time, a disc spring group is installed on the bolts and nuts at the flange connection, so that the bolts can be compensated for thermal expansion and the service life of the bolts can be increased.

[0009] 2. When the oil pump No. 1 pumps hydraulic oil into the inner box, it will also send an electrical signal to the motor. When the motor receives the electrical signal, it will start and drive the gear to rotate. The gear drives the gear ring to rotate, and the gear ring drives the inner box to rotate in the annular box. At this time, the inner box drives the through hole to rotate and intermittently communicate with the lower flange and multiple oil inlet holes in the annular box in sequence, so that the hydraulic oil in the inner box can be evenly fed into the oil cavity from the multiple oil inlet holes in sequence, so that the oil pressure at each position in the oil cavity can rise evenly, preventing the phenomenon of uneven oil pressure rise, which may lead to inconsistent oil pressure on the bottom of the metal sealing ring, affecting the compensation effect of the metal sealing ring, and further causing leakage of the wellhead.

[0010] 3. This sealed anti-channeling multiple compensation thermal recovery wellhead can complete the replacement of hydraulic oil, prevent the hydraulic oil from being heated for a long time in the oil cavity, which will affect the service life of the hydraulic oil. The pumping volume of the oil pump No. 2 is lower than the injection volume of the oil pump No. 1, so that the injection volume is greater than the pumping volume. Since the hydraulic oil in the inner box always remains full, the oil intake in the oil cavity is greater than the oil output, so the oil pressure in the oil cavity will still rise steadily, and there will be no phenomenon of balanced oil intake and output. The extracted hot hydraulic oil will be introduced into the other end of the pumping end of the oil box. At this time, the hot hydraulic oil will be pumped to the pumping end by the oil pump No. 1. At this time, the hydraulic cylinder oil passes through the heat conduction plate, and the heat conduction plate will absorb the heat in the hydraulic oil and dissipate the heat under the action of the cooling fan, so that the extracted hot hydraulic oil can be cooled and the hydraulic oil can be reused.

[0011] 4. In this sealed anti-channeling multiple compensation thermal recovery wellhead, the inclined transmission plate will push the hot hydraulic oil in the oil box to move towards the pumping end and improve the contact efficiency between the hot hydraulic oil and the heat conduction plate. When the arc plate passes over the roller, the compressed spring will drive the pressure plate to move upward and reset. At this time, the small motor in the sealing shell will start and drive the transmission plate to rotate, making it keep vertical, preventing it from pushing the hydraulic oil towards the oil inlet end during the upward movement. When the installation frame is reset, the small motor will drive the transmission plate to rotate and reset towards the oil inlet end. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the support plate structure of the present invention; Figure 3 It is a half-sectional view of the lower flange structure of the present invention; Figure 4 For the present invention Figure 3 The enlarged view of the structure at A in Figure 5 It is a half-sectional view of the oil box structure of the present invention; Figure 6 For the present invention Figure 5 The enlarged view of the structure at B in Figure 7 This is a schematic diagram of the inner box structure of the present invention.

[0013] In the figure: 1, wellhead device; 11, lower flange; 12, upper flange; 2, compensation mechanism; 21, oil box; 22, oil pump I; 23, oil pipe I; 24, motor; 25, gear; 26, annular box; 27, gear ring; 28, oil inlet hole; 29, through hole; 210, inner box; 211, metal sealing ring; 212, oil cavity; 213, support plate; 3, temperature control mechanism; 31, oil pump II; 32, oil pipe II; 33, heat conduction plate; 34, cooling fan; 4, boosting mechanism; 41, pressing plate; 42, arc plate; 43, mounting frame; 44, roller; 45, sealing shell; 46, drive plate; 5, bolt; 6, nut; 7, disc spring group. Specific embodiments

[0014] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0015] Please refer to Figures 1 - 7, an embodiment of the present invention is: a sealed anti-channeling multiple compensation thermal recovery wellhead, including a wellhead device 1, bolts 5 and nuts 6. The wellhead device 1 includes a lower flange 11 and an upper flange 12. A compensation mechanism 2 is provided on the circumferential surface of the lower flange 11. A temperature control mechanism 3 is provided on the surface of the compensation mechanism 2. A boosting mechanism 4 is provided inside the compensation mechanism 2; the compensation mechanism 2 includes a support plate 213, an oil box 21, a first oil pump 22, a first oil pipe 23, an annular box 26, an inner box 210, a through hole 29, an oil inlet hole 28, an oil cavity 212 and a metal sealing ring 211. The support plate 213 is fixedly connected to the circumferential surface of the lower flange 11. The oil box 21 is fixedly connected to the upper surface of the support plate 213. The first oil pump 22 is fixedly connected to the upper surface of the support plate 213. The first oil pipe 23 is fixedly connected and communicated with the oil outlet end of the first oil pump 22. The annular box 26 is fixedly connected to the circumferential surface of the lower flange 11. The inner box 210 is rotatably connected to the inner wall of the annular box 26. The through hole 29 is opened on the inner side surface of the inner box 210. The oil inlet hole 28 is opened on the outer surface of the lower flange 11 and the inner surface of the annular box 26. The oil cavity 212 is opened inside the lower flange 11. The metal sealing ring 211 is slidably connected to the inner wall of the oil cavity 212. A pressure sensor is provided on the inner wall of the oil cavity 212, and the pressure sensor is electrically connected to the first oil pump 22. The oil inlet end of the first oil pump 22 is fixedly connected and communicated with the oil box 21. When the device is in use, the pressure sensor inside the oil cavity 212 will detect the pressure inside the oil cavity 212 in real time. When a gap appears between the lower flange 11 and the upper flange 12 due to thermal expansion and contraction, the metal sealing ring 211 will move up with the size of the gap. After the metal sealing ring 211 moves up, the volume inside the oil cavity 212 increases but the oil quantity remains unchanged. Therefore, the pressure sensor in the oil cavity 212 will detect a decrease in the pressure value. At this time, even if the metal sealing ring 211 moves up with the size of the gap and fits against the upper flange 12, the reduced oil pressure is difficult to tightly press the metal sealing ring 211 against the bottom of the upper flange 12 and is easily driven to open by the high-pressure gas or liquid escaping outward, resulting in leakage of the wellhead; the compensation mechanism 2 further includes a motor 24, a gear 25 and a gear ring 27. The motor 24 is fixedly connected to the top of the oil box 21. The gear 25 is fixedly connected to the output end of the motor 24. The gear ring 27 is fixedly connected to the outer surface of the inner box 210. The motor 24 is electrically connected to the first oil pump 22; the number of the through holes 29 is two, and the two through holes 29 are symmetrically distributed on the inner side surface of the inner box 210. One check valve is provided on the inner wall of each of the two through holes 29, and the installation directions of the two check valves are opposite. One check valve is in the direction from outside to inside, and the other check valve is in the direction from inside to outside. The number of the oil inlet holes 28 is multiple, and the multiple oil inlet holes 28 are circularly arrayed on the outer surface of the lower flange 11 and the inner surface of the annular box 26. The oil inlet holes 28 on the outer surface of the lower flange 11 are communicated with the oil inlet holes 28 on the inner surface of the annular box 26;One end of the oil pipe 23 far from the oil pump 22 is fixedly communicated with the top of the annular box 26. The circumferential surface of the gear 25 meshes with the circumferential surface of the gear ring 27. The surface of the gear ring 27 is in contact with the inner wall of the outer side of the annular box 26, and a seal is provided between the gear ring 27 and the annular box 26. When the oil pump 22 pumps hydraulic oil into the inner box 210, the oil pump 22 also sends an electrical signal to the motor 24. When the motor 24 receives the electrical signal, it will start and drive the gear 25 to rotate. The gear 25 drives the gear ring 27 to rotate, and the gear ring 27 drives the inner box 210 to rotate in the annular box 26. At this time, the inner box 210 drives the through hole 29 to rotate and intermittently communicate with the lower flange 11 and a plurality of oil inlet holes 28 in the annular box 26 in sequence, so that the hydraulic oil in the inner box 210 can be evenly fed into the oil cavity 212 from the plurality of oil inlet holes 28 in sequence, so that the oil pressure at each position in the oil cavity 212 can rise evenly, preventing the phenomenon of uneven oil pressure rise, which may lead to inconsistent oil pressure forces on the bottom of the metal sealing ring 211, affecting the compensation effect of the metal sealing ring 211, and further causing leakage at the wellhead; The upper flange 12 and the lower flange 11 are fixed by bolts 5 and nuts 6. A disc spring group 7 is provided between the upper flange 12 and the nut 6. When the pressure sensor detects a pressure decrease, it will send an electrical signal to the oil pump 22. At this time, when the oil pump 22 receives the electrical signal, it will start and pump the hydraulic oil in the oil box 21 into the inner box 210 through the oil pipe 23. The hydraulic oil will enter the oil cavity 212 through the mutually communicated through hole 29 and oil inlet hole 28, and timely supplement the hydraulic oil in the oil cavity 212, so that the oil pressure in the oil cavity 212 rises and maintains a preset value. When the pressure sensor detects that the oil pressure has recovered to the preset value, it will send an electrical signal to the oil pump 22. When the oil pump 22 receives the electrical signal, it will stop working. By supplementing the oil pressure, the metal sealing ring 211 can be tightly attached to the bottom of the upper flange 12, and the axial compensation of the metal sealing ring 211 can be realized, thus preventing the phenomenon of leakage at the flange connection caused by sudden temperature rise at the wellhead, cooling shrinkage after stopping injection, and repeated expansion and contraction of metal components. At the same time, a disc spring group 7 is installed on the bolts 5 and nuts 6 at the flange connection, so that the bolts 5 can compensate for thermal expansion and increase the service life of the bolts 5.;

[0016] Working principle: When the device is in use, the pressure sensor inside the oil chamber 212 will detect the pressure inside the oil chamber 212 in real time. When a gap appears between the lower flange 11 and the upper flange 12 due to thermal expansion and contraction, the metal sealing ring 211 will move upward following the size of the gap. After the metal sealing ring 211 moves upward, the volume inside the oil chamber 212 increases but the oil quantity remains unchanged. Therefore, the pressure sensor in the oil chamber 212 will detect a decrease in the pressure value. At this time, even if the metal sealing ring 211 moves upward following the size of the gap and fits against the upper flange 12, the reduced oil pressure is difficult to tightly press the metal sealing ring 211 against the bottom of the upper flange 12, and it is easily driven to open by the high-pressure gas or liquid gushing outwards, thus resulting in leakage at the wellhead. When the pressure sensor detects a decrease in pressure, it will send an electrical signal to the first oil pump 22. At this time, after receiving the electrical signal, the first oil pump 22 will start and pump the hydraulic oil in the oil box 21 into the inner box 210 through the first oil pipe 23. The hydraulic oil will enter the oil chamber 212 through the interconnected through holes 29 and oil inlet holes 28, and timely supplement the hydraulic oil in the oil chamber 212, so that the oil pressure in the oil chamber 212 rises and maintains the preset value. When the pressure sensor detects that the oil pressure has recovered to the preset value, it will send an electrical signal to the first oil pump 22. When the first oil pump 22 receives the electrical signal, it will stop working. By supplementing the oil pressure, the metal sealing ring 211 can be tightly fitted against the bottom of the upper flange 12, and axial compensation of the metal sealing ring 211 can be achieved, thereby preventing the phenomenon of leakage at the flange connection caused by sudden temperature rise at the wellhead, cooling and contraction after injection stop, and repeated expansion and contraction of metal components. At the same time, a disc spring group 7 is installed on the bolts 5 and nuts 6 at the flange connection, so as to compensate for thermal expansion of the bolts 5 and increase the service life of the bolts 5; When the first oil pump 22 pumps the hydraulic oil into the inner box 210, the first oil pump 22 will also send an electrical signal to the motor 24. When the motor 24 receives the electrical signal, it will start and drive the gear 25 to rotate. The gear 25 drives the gear ring 27 to rotate, and the gear ring 27 drives the inner box 210 to rotate in the annular box 26. At this time, the inner box 210 drives the through holes 29 to rotate and intermittently communicate with the lower flange 11 and multiple oil inlet holes 28 in the annular box 26 in sequence, so that the hydraulic oil in the inner box 210 can enter the oil chamber 212 evenly from multiple oil inlet holes 28 in sequence, thereby enabling the oil pressure at each position in the oil chamber 212 to rise evenly, preventing the phenomenon of uneven oil pressure rise, which may lead to inconsistent oil pressure forces at some parts of the bottom of the metal sealing ring 211, affecting the compensation effect of the metal sealing ring 211, and further resulting in leakage at the wellhead.

[0017] Please refer to Figures 1 - 7, on the basis of the above embodiments, in another embodiment of the present invention, the temperature control mechanism 3 includes an oil pump two 31, an oil pipe two 32, a heat conducting plate 33 and a cooling fan 34. The oil pump two 31 is fixedly connected to the upper surface of the support plate 213. The oil pipe two 32 is fixedly communicated with the oil inlet end of the oil pump two 31. The number of the heat conducting plates 33 is set to be multiple, and the multiple heat conducting plates 33 are fixedly connected to the inner wall of the oil box 21. The cooling fan 34 is installed on the side of the heat conducting plate 33. When the oil pump one 22 is started, an electrical signal will be sent to the oil pump two 31. When the oil pump two 31 receives the electrical signal, it will be started. The oil pump two 31 will pump out the hydraulic oil in the inner box 210 through the oil pipe two 32. Since two through holes 29 are provided on the inner side surface of the inner box 210, and one-way valves in opposite directions are provided in the two through holes 29, the oil in the inner box 210 enters the oil cavity 212 through the one-way valve in one through hole 29, and at the same time, the hydraulic oil in the oil cavity 212 is pushed out through the other through hole 29 and discharged into the inner box 210. The hot hydraulic oil entering the inner box 210 will be mixed with the cold hydraulic oil inside it. Driven by the clockwise rotating inner box 210, the hot hydraulic oil in this area will move to the position of the oil pipe two 32 and be pumped out by the oil pump two 31, so that the replacement of the hydraulic oil can be completed, preventing the hydraulic oil from being heated for a long time in the oil cavity 212, and thus affecting the service life of the hydraulic oil; the circumferential surface of the oil pipe two 32 is fixedly connected to the inner wall of the top of the annular box 26. The oil outlet end of the oil pump two 31 is fixedly communicated with one end of the oil box 21 away from the oil pump one 22. The oil pump two 31 is electrically connected to the oil pump one 22. The oil pumping volume of the oil pump two 31 is lower than the oil injection volume of the oil pump one 22, so that the oil injection volume is greater than the oil pumping volume. Since the hydraulic oil in the inner box 210 always remains full, the oil inflow volume in the oil cavity 212 is greater than the oil outflow volume. Therefore, the oil pressure in the oil cavity 212 will still rise steadily, and the phenomenon of balanced inflow and outflow will not occur. The pumped hot hydraulic oil will be introduced into the other end of the oil pumping end of the oil box 21. At this time, the hot hydraulic oil will be pumped to the oil pumping end by the oil pump one 22. At this time, the hydraulic cylinder oil passes through the heat conducting plate 33, and the heat conducting plate 33 will absorb the heat in the hydraulic oil and dissipate the heat under the action of the cooling fan 34, so that the pumped hot hydraulic oil can be cooled, and the hydraulic oil can be reused repeatedly.

[0018] The boosting mechanism 4 includes a pressing plate 41, an arc-shaped plate 42, a mounting frame 43, a roller 44, a sealing shell 45 and a transmission plate 46. The pressing plate 41 is slidably connected to the inner wall of the top of the oil box 21 through a spring. The arc-shaped plate 42 is fixedly connected to the bottom of the gear ring 27. The mounting frame 43 is fixedly connected to the bottom of the pressing plate 41. The roller 44 is rotatably connected to the inner wall of the pressing plate 41. The transmission plate 46 is rotatably connected to the inner wall of the mounting frame 43. The sealing shell 45 is fixedly connected to the surface of the mounting frame 43. A small motor is fixedly connected to the inner wall of the sealing shell 45, and the output end of the small motor is fixedly connected to the transmission plate 46. The circumferential surface of the roller 44 contacts the arc-shaped surface of the arc-shaped plate 42. When the gear ring 27 rotates, it will drive the arc-shaped plate 42 to rotate. The arc-shaped plate 42 pushes the roller 44 downward through the arc-shaped surface. The roller 44 drives the pressing plate 41 to move downward. While the pressing plate 41 moves downward, it compresses the spring and drives the mounting frame 43 to move downward. The mounting frame 43 drives the inclined transmission plate 46 to move downward. At this time, the inclined transmission plate 46 will push the hot hydraulic oil in the oil box 21 towards the oil pumping end and improve the contact efficiency between the hot hydraulic oil and the heat conducting plate 33. Valves are provided on the inner walls of both the second oil pipe 32 and the first oil pipe 23. The valves are used to close the second oil pipe 32 and the first oil pipe 23 when the second oil pump 31 and the first oil pump 22 are not in use. The valves on the inner walls of the second oil pipe 32 and the first oil pipe 23 are opened and closed together with the second oil pump 31 and the first oil pump 22. When the arc-shaped plate 42 passes over the roller 44, the compressed spring will drive the pressing plate 41 to move upward and reset. At this time, the small motor in the sealing shell 45 will start and drive the transmission plate 46 to rotate to keep it in a vertical state to prevent it from pushing the hydraulic oil towards the oil inlet end during the upward movement. When the mounting frame 43 is reset, the small motor will drive the transmission plate 46 to rotate and reset towards the oil inlet end again.

[0019] Working principle: When the oil pump 22 starts, an electrical signal will be sent to the oil pump 31. When the oil pump 31 receives the electrical signal, it will start. The oil pump 31 will extract the hydraulic oil in the inner box 210 through the oil pipe 32. Since two through holes 29 are provided on the inner side of the inner box 210, and check valves in opposite directions are arranged in the two through holes 29, the oil in the inner box 210 enters the oil cavity 212 through the check valve in one through hole 29, and at the same time, the hydraulic oil in the oil cavity 212 is pushed out through the other through hole 29 into the inner box 210. The hot hydraulic oil entering the inner box 210 will be mixed with the cold hydraulic oil inside it. Driven by the clockwise rotating inner box 210, the hot hydraulic oil in this area will move to the oil pipe 32 and be extracted by the oil pump 31, so that the replacement of the hydraulic oil can be completed, preventing the hydraulic oil from being heated for a long time in the oil cavity 212, thereby affecting the service life of the hydraulic oil. The pumping volume of the oil pump 31 is lower than the injection volume of the oil pump 22, so that the injection volume is greater than the pumping volume. Because the hydraulic oil in the inner box 210 always remains full, the inflow of oil in the oil cavity 212 is greater than the outflow, so the oil pressure in the oil cavity 212 will still rise steadily, and there will be no phenomenon of balanced inflow and outflow. The extracted hot hydraulic oil will be introduced into the other end of the pumping end of the oil box 21. At this time, the hot hydraulic oil will be pumped to the pumping end by the oil pump 22. At this time, the hydraulic cylinder oil passes through the heat conduction plate 33, and the heat conduction plate 33 will absorb the heat in the hydraulic oil and dissipate the heat under the action of the cooling fan 34, so that the extracted hot hydraulic oil can be cooled, and the hydraulic oil can be used repeatedly; When the gear ring 27 rotates, it will drive the arc plate 42 to rotate. The arc plate 42 pushes the roller 44 to move downward through the arc surface. The roller 44 drives the pressing plate 41 to move downward. While the pressing plate 41 moves downward, it compresses the spring and drives the installation frame 43 to move downward. The installation frame 43 drives the inclined transmission plate 46 to move downward. At this time, the inclined transmission plate 46 will push the hot hydraulic oil in the oil box 21 to move towards the pumping end, and improve the contact efficiency between the hot hydraulic oil and the heat conduction plate 33. When the arc plate 42 passes over the roller 44, the compressed spring will drive the pressing plate 41 to move upward and reset. At this time, the small motor in the sealing shell 45 will start and drive the transmission plate 46 to rotate, making it keep a vertical state to prevent it from pushing the hydraulic oil towards the inlet end again during the upward movement. When the installation frame 43 is reset, the small motor will drive the transmission plate 46 to rotate and reset towards the inlet end again.

[0020] The present invention provides a sealed and anti-channeling multiple compensation thermal recovery wellhead. There are many methods and ways to specifically implement this technical solution. The above description is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and retouches can be made, and these improvements and retouches should also be regarded as the protection scope of the present invention. Each component not clearly defined in this embodiment can be implemented by the prior art.

Claims

1. A sealed anti-channeling multi-compensation thermal recovery wellhead, comprising a wellhead device (1), a bolt (5) and a nut (6), characterized in that: The wellhead device (1) comprises a lower flange (11) and an upper flange (12); a compensation mechanism (2) is arranged on the circumferential surface of the lower flange (11); a temperature control mechanism (3) is arranged on the surface of the compensation mechanism (2); and a boosting mechanism (4) is arranged inside the compensation mechanism (2); The compensation mechanism (2) comprises a support plate (213), an oil box (21), an oil pump (22), an oil pipe (23), an annular box (26), an inner box (210), a through hole (29), an oil inlet hole (28), an oil chamber (212) and a metal sealing ring (211); the support plate (213) is fixedly connected to the circumferential surface of the lower flange (11); the oil box (21) is fixedly connected to the upper surface of the support plate (213); the oil pump (22) is fixedly connected to the upper surface of the support plate (213); the oil pipe (23) is fixedly connected to the oil outlet end of the oil pump (22); and the annular box (26) is fixedly connected to the inner box (210). The inner box (210) is rotatably connected to the inner wall of the annular box (26), the through hole (29) is provided on the inner side surface of the inner box (210), the oil inlet hole (28) is provided on the outer surface of the lower flange (11) and the inner surface of the annular box (26), the oil chamber (212) is provided inside the lower flange (11), the metal sealing ring (211) is slidably connected to the inner wall of the oil chamber (212), the inner wall of the oil chamber (212) is provided with a pressure sensor, and the pressure sensor is electrically connected to the oil pump 1 (22), and the oil inlet end of the oil pump 1 (22) is fixedly connected to the oil box (21).

2. The sealed anti-channeling multi-compensation thermal recovery wellhead according to claim 1 is characterized in that: The compensation mechanism (2) further comprises a motor (24), a gear (25) and a gear ring (27); the motor (24) is fixedly connected to the top of the oil box (21); the gear (25) is fixedly connected to the output end of the motor (24); the gear ring (27) is fixedly connected to the outer surface of the inner box (210); and the motor (24) is electrically connected to the oil pump 1 (22).

3. The sealed anti-channeling multi-compensation thermal recovery wellhead according to claim 2 is characterized in that: The number of the through holes (29) is two, and the two through holes (29) are symmetrically distributed on the inner side surface of the inner box (210). The inner walls of the two through holes (29) are respectively provided with a one-way valve, and the two one-way valves are installed in opposite directions, one of the one-way valves is in a direction from the outside to the inside, and the other of the one-way valves is in a direction from the inside to the outside. The number of the oil inlet holes (28) is multiple, and the multiple oil inlet holes (28) are distributed in a circular array on the outer surface of the lower flange (11) and the inner surface of the annular box (26). The oil inlet holes (28) on the outer surface of the lower flange (11) and the oil inlet holes (28) on the inner surface of the annular box (26) are connected to each other.

4. The sealed anti-channeling multi-compensation thermal recovery wellhead according to claim 3 is characterized in that: One end of the oil pipe 1 (23) away from the oil pump 1 (22) is fixedly connected to the top of the annular box (26), the circumferential surface of the gear (25) and the circumferential surface of the gear ring (27) are meshed with each other, the surface of the gear ring (27) and the inner wall of the outer side of the annular box (26) are in contact with each other, and a seal is provided between the gear ring (27) and the annular box (26).

5. The sealed anti-channeling multi-compensation thermal recovery wellhead according to claim 4 is characterized in that: The upper flange (12) and the lower flange (11) are fixed by bolts (5) and nuts (6), and a disc spring assembly (7) is provided between the upper flange (12) and the nuts (6).

6. The sealed anti-channeling multi-compensation thermal recovery wellhead according to claim 5 is characterized in that: The temperature control mechanism (3) comprises an oil pump (31), an oil pipe (32), a heat conduction plate (33) and a cooling fan (34); the oil pump (31) is fixedly connected to the upper surface of the support plate (213); the oil pipe (32) is fixedly connected to the oil inlet end of the oil pump (31); a plurality of heat conduction plates (33) are provided, and the plurality of heat conduction plates (33) are fixedly connected to the inner wall of the oil box (21); and the cooling fan (34) is installed on the side of the heat conduction plate (33).

7. The sealed anti-channeling multi-compensation thermal recovery wellhead according to claim 6 is characterized in that: The circumferential surface of the oil pipe 2 (32) is fixedly connected to the inner wall of the top of the annular box (26), the oil outlet end of the oil pump 2 (31) is fixedly connected to an end of the oil box (21) away from the oil pump 1 (22), and the oil pump 2 (31) is electrically connected to the oil pump 1 (22).

8. The sealed anti-channeling multi-compensation thermal recovery wellhead according to claim 7 is characterized in that: The boost mechanism (4) comprises a pressure plate (41), an arc plate (42), a mounting frame (43), a roller (44), a sealing shell (45) and a transmission plate (46); the pressure plate (41) is slidably connected to the inner wall of the top of the oil box (21) via a spring; the arc plate (42) is fixedly connected to the bottom of the gear ring (27); the mounting frame (43) is fixedly connected to the bottom of the pressure plate (41); the roller (44) is rotatably connected to the inner wall of the pressure plate (41); the transmission plate (46) is rotatably connected to the inner wall of the mounting frame (43); and the sealing shell (45) is fixedly connected to the surface of the mounting frame (43).

9. The sealed anti-channeling multi-compensation thermal recovery wellhead according to claim 8, characterized in that: A small motor is fixedly connected to the inner wall of the sealing shell (45), the output end of the small motor is fixedly connected to the transmission plate (46), and the circumferential surface of the roller (44) is in contact with the arc surface of the arc plate (42).

10. The sealed anti-channeling multi-compensation thermal recovery wellhead according to claim 9, characterized in that: The inner walls of the oil pipe 2 (32) and the oil pipe 1 (23) are both provided with valves, and the valves are used to close the oil pipe 2 (32) and the oil pipe 1 (23) when the oil pump 2 (31) and the oil pump 1 (22) are not in use. The valves on the inner walls of the oil pipe 2 (32) and the oil pipe 1 (23) are opened and closed together with the oil pump 2 (31) and the oil pump 1 (22).

Images