CN118462595A

CN118462595A - Wellhead back pressure-reducing oil-gas mixed transportation device

Info

Publication number: CN118462595A
Application number: CN202410734833.4A
Authority: CN
Inventors: 何新怀; 李宏军; 薛自影; 王海
Original assignee: Beijing Yihaike Pump Technology Co ltd; Beijing Luhai Xincheng Technology Co ltd
Current assignee: Beijing Yihaike Pump Technology Co ltd; Beijing Luhai Xincheng Technology Co ltd
Priority date: 2024-06-07
Filing date: 2024-06-07
Publication date: 2024-08-09

Abstract

The invention discloses a wellhead drop back pressure oil-gas mixing and conveying device, which comprises a collecting tank, a rotary jet pump, a buffer plate, a pushing component, a pressure relief switching component, an intermittent driving component and an oil-gas discharging component, wherein a first buffer tank and a second buffer tank are arranged above the collecting tank, one ends of the first buffer tank and the second buffer tank are communicated with the collecting tank through oil gas pipes, the invention is characterized in that the first buffer tank, the second buffer tank, the pushing component, the pressure relief switching component, the intermittent driving component and the oil-gas discharging component are additionally arranged, the oil, gas and water pumped by the rotary jet pump are alternately discharged into the first buffer tank and the second buffer tank, so that the excessive pressure in the first buffer tank and the second buffer tank is prevented from influencing the conveying efficiency of the rotary jet pump to oil, the reverse flow of the oil into the oil well caused by the excessive pressure in the first buffer tank or the second buffer tank is avoided, the efficiency of the rotary jet pump to oil and gas mixed transportation can be effectively improved, the reverse flow of the oil is avoided, and the safety of the oil and gas mixed transportation is improved.

Description

Wellhead back pressure-reducing oil-gas mixed transportation device

Technical Field

The invention relates to the technical field of oil-gas mixing and conveying devices, in particular to a wellhead back-pressure-reducing oil-gas mixing and conveying device.

Background

In the oil extraction process of an oil field, crude oil is lifted from a well to a wellhead by an oil pumping unit and collected to a metering station or a combination station, and then oil, gas and water separation and treatment are intensively carried out in the combination station.

The existing oil in the oil well is pumped and conveyed by adopting a screw pump for mixed conveying or adopting a jet pump for mixed conveying, wherein the screw pump has the defects of low efficiency and high failure rate due to gas influence, the jet pump can realize mixed conveying, the gas-liquid separation is not needed in a refitting mode, the gas-liquid can be mixed and conveyed, and the failure point of conveying treatment equipment and equipment can be reduced, the refitting mode can improve the efficiency of oil mixed conveying, but the pressure at the output end of the jet pump is high, the pressure at one side of an oil wellhead is small, and if petroleum diversion exists, the petroleum diversion is sucked into the oil well, so that the reflux of petroleum is caused, and the efficiency of petroleum extraction is influenced.

Disclosure of Invention

The invention aims to provide a wellhead back pressure reduction oil-gas mixing and conveying device capable of improving oil-gas mixing and conveying safety so as to solve the problems in the background technology.

In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides a well head falls back pressure oil gas and mixes transportation device, includes collecting vessel, jet pump, buffer board, pushing away the subassembly, pressure release switching assembly, intermittent drive subassembly and oil gas and discharges the subassembly, the top of collecting vessel is equipped with first buffer tank and second buffer tank, the one end of first buffer tank and second buffer tank all through the oil pipe with the collecting vessel is linked together, the bottom of first buffer tank and second buffer tank all through arrange oil pipe with the collecting vessel intercommunication, jet pump install in one side of collecting vessel for take out the oil of underground, jet pump's one end intercommunication is equipped with the material taking pipe, jet pump's the other end and three-way pipe intercommunication, the other both ends of three-way pipe through the oil inlet pipe respectively with the one end intercommunication of first buffer tank and second buffer tank, the one end intercommunication of oil inlet pipe be equipped with the oil buffer cover, the buffer board install in the inside of first buffer tank and second buffer tank, to the oil buffer cover is discharged, just one side of buffer board is fixed with arrange the oil release buffer tank with the buffer tank intercommunication, jet pump install in the one side of buffer tank is equipped with the pressure release pump in the second buffer tank, the one side of buffer tank is equipped with the material taking off the plug pipe is equipped with the first buffer tank and the second buffer tank alternately, the pressure release switching assembly is used for the pressure release switching assembly in the first buffer tank is connected to the first buffer tank and the pressure release subassembly, the pressure release assembly is connected to the first plug assembly is in the inside the plug assembly is alternately, the plug is connected to the first plug tank is in the first plug tank, the oil gas inside the first buffer tank and the second buffer tank is introduced into the collecting tank, the oil gas discharging assembly is connected with the pushing assembly, the oil gas in the first buffer tank and the second buffer tank can be alternately discharged into the first buffer tank and the second buffer tank by additionally arranging the first buffer tank, the second buffer tank, the pushing assembly, the pressure release switching assembly, the intermittent driving assembly and the oil gas discharging assembly, the fact that the pressure in the first buffer tank and the pressure in the second buffer tank are too high influences the conveying efficiency of the jet pump on the oil is avoided, meanwhile, the fact that the pressure in the first buffer tank or the second buffer tank is too high causes the reverse flow of the oil to enter the oil well is avoided, the oil conveying efficiency of the jet pump can be effectively improved, meanwhile, the reverse flow of the oil is avoided, the safety of oil gas extraction and mixed conveying is improved, the oil gas in the first buffer tank and the second buffer tank is discharged, and the fact that the pressure in the buffer tank is too high influences the jet pump on the oil extraction.

Preferably, the pushing component comprises a push rod arranged in the first buffer tank and the second buffer tank, the push rod sequentially penetrates through the screen plate and the first buffer tank and the second buffer tank and extends to the outside of the screen plate and is fixedly connected with the fixing rod, a connecting rod is fixedly arranged on one side of the fixing rod, a toothed plate is fixedly arranged at one end of the connecting rod, a spring piece is fixedly arranged at one side end of the toothed plate, a first gear is meshed with one side of the toothed plate, the first gear is fixedly sleeved on a shaft rod, one end of the shaft rod is connected with the output end of a motor, the screen plate is fixedly arranged in the first buffer tank and the second buffer tank, a first spring is sleeved on one side of the screen plate and is positioned on the push rod, and a stop block is fixedly arranged on one end of the first spring and is positioned on the push rod; the pushing component can separate and plug the plugging block from the oil outlet cover at the end part of the oil inlet pipe, and reverse flow of petroleum caused by stopping of the rotary jet pump is avoided.

Preferably, the pressure release switching assembly comprises a rotating rod arranged below the shaft rod, an L-shaped rod is fixedly arranged at one end of the rotating rod, one end of the L-shaped rod is slidably arranged in the pushing groove, linkage rods are arranged at two sides of the pushing groove and fixedly connected with the end part of the pushing groove through cross rods, and a first intercepting column and a second intercepting column are fixedly arranged at two ends of the linkage rod respectively;

The pressure relief switching assembly further comprises a first fixed block fixedly arranged on the oil inlet pipe, a second fixed block is fixedly arranged on the oil discharge pipe, cavities communicated with the oil inlet pipe and the oil discharge pipe are respectively formed in the first fixed block and the second fixed block, and the first intercepting column and the second intercepting column are respectively arranged in the cavities in a sliding manner in the first fixed block and the second fixed block; through addding the pressure release switching component, can carry out the pressure release in turn to the oil in first, the second buffer tank, avoid the pressure in first, the second buffer tank too big or the liquid level is too high to cause the oil reflux of taking out, increased the security of oil transportation.

Preferably, the intermittent driving assembly comprises a supporting block fixedly sleeved on the outer side of the rotating rod, a bearing sleeve is rotatably sleeved on the outer side of the supporting block and positioned between the supporting block and positioned on the rotating rod, a second spring is sleeved on the rotating rod, transverse plates are fixedly arranged on two sides of the bearing sleeve, a transverse block is fixedly arranged at one end, far away from the L-shaped rod, of the rotating rod, U-shaped grooves are formed in two ends of the transverse block, a sliding block is slidably arranged in the U-shaped grooves, a squeezing block is fixedly arranged on one side of the sliding block, a movable rod is arranged on one side of the sliding block, two ends of the movable rod are respectively connected with the sliding block and the bearing sleeve through a hinge shaft, the transverse block is arranged in a circular ring, one end of the circular ring is fixedly connected with one side of the first gear, and clamping grooves are formed in one side of the squeezing block and the inner wall of the circular ring;

the intermittent driving assembly further comprises vertical rods fixedly arranged in the first buffer tank and the second buffer tank, a floating plate is sleeved on the vertical rods in a sliding mode, a push rod is fixedly arranged on one side of the floating plate, one end of the push rod penetrates through the first buffer tank or the second buffer tank and extends outwards to be fixedly connected with a top plate, and the top plate is located below the transverse plate; through addding intermittent drive subassembly, can realize being connected between the axostylus axostyle, avoid driving equipment's input to use has increased bull stick pivoted convenience, can realize driving the motion of pressure release switching component.

Preferably, the oil gas discharging assembly comprises an induced draft hood arranged in the first buffer tank and the second buffer tank, one end of the induced draft hood is communicated with the oil gas pipe, an induced draft blade is arranged in the induced draft hood, the induced draft blade is fixedly arranged on a transmission rod, one end of the transmission rod penetrates through the oil gas pipe and extends outwards to be fixedly connected with the second gear, a third gear is fixedly arranged on the shaft rod, and the third gear and the second gear are in meshed connection through a toothed chain; oil gas in the first buffer tank and the second buffer tank can be timely discharged into the collecting tank.

Preferably, the inside guide rail that all fixes of first buffer tank and second buffer tank, the inside slip of guide rail is equipped with the guide block, one side of guide block with the top fixed connection of buffer board can play the effect of supporting the direction to the buffer board, has increased the security that the buffer board was placed in first, second buffer tank.

Preferably, the outside of bull stick rotates the cover and is equipped with the bearing bracket, the bearing bracket through the support with the lateral wall fixed connection of first buffer tank and second buffer tank can play the effect of supporting the bull stick, has increased bull stick pivoted stability.

Preferably, the below of motor is equipped with the frame, the frame install in the top of collection tank can play the effect of supporting the motor, avoids unsettled the placing of motor.

Preferably, some of the toothed plates are provided with sliding rails, the toothed plates are slidably arranged in the toothed plates, the sliding rails are fixedly connected with the rack, the sliding rails can play a supporting role, meanwhile, the sliding rails can play a supporting role on the toothed plates, and the sliding stability of the toothed plates is improved.

Preferably, the collecting tank is provided with an oil discharge pipe and an air discharge pipe, and the oil discharge pipe and the air discharge pipe are respectively provided with a control valve, so that the oil and the oil gas in the collecting tank can be conveniently discharged.

Compared with the prior art, the invention has the beneficial effects that:

According to the invention, the existing inlet drop back pressure oil-gas mixing and conveying device is optimized, and the first buffer tank, the second buffer tank, the pushing component, the pressure relief switching component, the intermittent driving component and the oil-gas discharging component are additionally arranged, so that oil pumped by the rotary jet pump can be alternately discharged into the first buffer tank and the second buffer tank, the problem that the excessive pressure in the first buffer tank and the second buffer tank influences the conveying efficiency of the rotary jet pump on the oil, and meanwhile, the problem that the excessive pressure in the first buffer tank or the second buffer tank causes the oil to flow back into the oil well is avoided.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present invention;

FIG. 2 is a schematic side view of the present invention;

FIG. 3 is a side view of the collection tank of the present invention;

FIG. 4 is a schematic diagram of the structure of the collecting tank and the first and second buffer tanks according to the present invention;

FIG. 5 is a front view of FIG. 4 in accordance with the present invention;

FIG. 6 is a cross-sectional view of a first surge tank of the present invention;

FIG. 7 is a schematic diagram of the connection between the pushing assembly, the pressure relief switching assembly and the intermittent drive assembly according to the present invention;

FIG. 8 is a cross-sectional view of the first and second fixed blocks of the present invention;

FIG. 9 is a schematic view of the connection between the ring and the cross block in the present invention;

FIG. 10 is a schematic view of the separation between the ring and the cross-piece in the present invention;

FIG. 11 is a schematic view of the structure of the transverse block of the present invention;

FIG. 12 is a schematic view of a ring according to the present invention;

FIG. 13 is a schematic view of a pushing assembly according to the present invention.

In the figure: 1. a collection tank; 2. a first buffer tank; 3. a second buffer tank; 4. an oil gas pipe; 5. a rotary jet pump; 6. a material taking pipe; 7. a three-way pipe; 8. an oil inlet pipe; 9. an oil outlet cover; 10. a buffer plate; 11. a block; 12. a push rod; 13. a screen plate; 14. a fixed rod; 15. a connecting rod; 16. a toothed plate; 17. a spring plate; 18. a first gear; 19. a shaft lever; 20. a motor; 21. a first spring; 22. a stop block; 23. a rotating rod; 24. an L-shaped rod; 25. pushing grooves; 26. a linkage rod; 27. a cross bar; 28. a first shut-off column; 29. a second shut-off column; 30. a first fixed block; 31. an oil drain pipe; 32. a second fixed block; 33. a cavity; 34. a support block; 35. a bearing sleeve; 36. a cross plate; 37. a transverse block; 38. a U-shaped groove; 39. a slide block; 40. extruding a block; 41. a movable rod; 42. a hinge shaft; 43. a circular ring; 44. a vertical rod; 45. a floating plate; 46. a push rod; 47. a top plate; 48. an induced draft cover; 49. wind-guiding blades; 50. a transmission rod; 51. a second gear; 52. a third gear; 53. a toothed chain; 54. a guide rail; 55. a guide block; 56. a bearing bracket; 57. a bracket; 58. a frame; 59. a slide rail; 60. a second spring; 61. an oil discharge pipe; 62. a gas discharge tube; 63. a clamping groove.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Example 1

Referring to fig. 1-13, a wellhead back-pressure-reducing oil-gas mixing and conveying device in the drawings comprises a collecting tank 1, a rotary jet pump 5, a buffer plate 10, a pushing component, a pressure relief switching component, an intermittent driving component and an oil-gas discharging component, wherein a first buffer tank 2 and a second buffer tank 3 are arranged above the collecting tank 1, one ends of the first buffer tank 2 and the second buffer tank 3 are communicated with the collecting tank 1 through oil pipes 4, bottoms of the first buffer tank 2 and the second buffer tank 3 are communicated with the collecting tank 1 through oil drain pipes 31, the rotary jet pump 5 is arranged on one side of the collecting tank 1 and is used for pumping underground oil, one end of the rotary jet pump 5 is communicated with a material taking pipe 6, the other end of the rotary jet pump 5 is communicated with a three-way pipe 7, the other two ends of the three-way pipe 7 are respectively communicated with one ends of the first buffer tank 2 and the second buffer tank 3 through oil inlet pipes 8, one end of the oil inlet pipe 8 is communicated with an oil outlet cover 9, a buffer plate 10 is arranged in the first buffer tank 2 and the second buffer tank 3, oil discharged from the oil outlet cover 9 is buffered, a plugging block 11 is fixedly arranged on one side of the buffer plate 10, the plugging block 11 plugs the oil outlet cover 9, a pushing component is arranged in the first buffer tank 2 and the second buffer tank 3 and is used for pushing the buffer plate 10, the plugging block 11 plugs the oil outlet cover 9, a pressure relief switching component is arranged in the first buffer tank 2 and the second buffer tank 3 and is used for alternately switching and pressure relief of oil collected in the first buffer tank 2 and the second buffer tank 3 and discharging the oil into the collecting tank 1, an intermittent driving component is arranged above the pressure relief switching component and is used for connecting the pushing component and the pressure relief switching component, the oil-gas discharging component is arranged in the first buffer tank 2 and the second buffer tank 3, the oil gas in the first buffer tank 2 and the second buffer tank 3 is introduced into the collecting tank 1, and the oil gas discharging component is connected with the pushing component.

Referring to fig. 1-7 and 13, the pushing assembly in the drawing includes a push rod 12 disposed inside the first buffer tank 2 and the second buffer tank 3, the push rod 12 sequentially penetrates through the mesh plate 13 and the first buffer tank 2 and the second buffer tank 3 and extends to the outside thereof to be fixedly connected with a fixing rod 14, a connecting rod 15 is fixedly disposed on one side of the fixing rod 14, a toothed plate 16 is fixedly disposed at one end of the connecting rod 15, a spring plate 17 is fixedly disposed at one end of the toothed plate 16, a first gear 18 is disposed on one side of the toothed plate 16 in a meshing manner, the first gear 18 is fixedly sleeved on a shaft rod 19, one end of the shaft rod 19 is connected with an output end of the motor 20, the mesh plate 13 is fixedly disposed inside the first buffer tank 2 and the second buffer tank 3, a first spring 21 is sleeved on one side of the mesh plate 13 and is disposed on the push rod 12, and a stop 22 is fixedly disposed on one end of the first spring 21 and is disposed on the push rod 12.

Referring to fig. 1-8, the pressure release switching assembly in the drawings comprises a rotating rod 23 arranged below a shaft lever 19, wherein an L-shaped rod 24 is fixedly arranged at one end of the rotating rod 23, one end of the L-shaped rod 24 is slidably arranged in a push groove 25, both sides of the push groove 25 are respectively provided with a linkage rod 26, the linkage rods 26 are fixedly connected with the end part of the push groove 25 through a cross rod 27, and both ends of the linkage rod 26 are respectively fixedly provided with a first intercepting column 28 and a second intercepting column 29;

Referring to fig. 1-8, the pressure release switching assembly in the drawing further includes a first fixing block 30 fixedly disposed on the oil inlet pipe 8, a second fixing block 32 fixedly disposed on the oil outlet pipe 31, cavities 33 communicating with the oil inlet pipe 8 and the oil outlet pipe 31 are respectively disposed in the first fixing block 30 and the second fixing block 32, and a first intercepting column 28 and a second intercepting column 29 are respectively slidably disposed in the cavities 33 in the first fixing block 30 and the second fixing block 32.

Referring to fig. 7-12, the intermittent driving assembly in the drawing includes a supporting block 34 fixedly sleeved on the outer side of the rotating rod 23, a bearing sleeve 35 is rotatably sleeved on the outer side of the supporting block 34 and positioned on the outer side of the rotating rod 23, a second spring 60 is sleeved between the bearing sleeve 35 and the supporting block 34 and positioned on the rotating rod 23, transverse plates 36 are fixedly arranged on two sides of the bearing sleeve 35, a transverse block 37 is fixedly arranged at one end of the rotating rod 23 far away from the L-shaped rod 24, U-shaped grooves 38 are formed at two ends of the transverse block 37, a sliding block 39 is slidingly arranged in the U-shaped grooves 38, an extrusion block 40 is fixedly arranged at one side of the sliding block 39, a movable rod 41 is arranged at one side of the sliding block 39, two ends of the movable rod 41 are respectively connected with the sliding block 39 and the bearing sleeve 35 through a hinge shaft 42, the transverse block 37 is arranged in the circular ring 43, one end of the circular ring 43 is fixedly connected with one side of the first gear 18, and clamping grooves 63 are formed in one side of the extrusion block 40 and the inner wall of the circular ring 43;

Referring to fig. 7-12, the intermittent driving assembly in the drawings further includes a vertical rod 44 fixedly disposed inside the first buffer tank 2 and the second buffer tank 3, a floating plate 45 is slidably sleeved on the vertical rod 44, a top rod 46 is fixedly disposed on one side of the floating plate 45, one end of the top rod 46 penetrates through the first buffer tank 2 or the second buffer tank 3 and extends outwards to be fixedly connected with a top plate 47, and the top plate 47 is located below the transverse plate 36.

Referring to fig. 1-7, the oil-gas discharging assembly in the drawing includes an induced draft hood 48 disposed inside the first buffer tank 2 and the second buffer tank 3, one end of the induced draft hood 48 is communicated with the oil-gas pipe 4, an induced draft fan 49 is disposed inside the induced draft hood 48, the induced draft fan 49 is fixedly disposed on a transmission rod 50, one end of the transmission rod 50 penetrates through the oil-gas pipe 4 and extends outwards to be fixedly connected with a second gear 51, a third gear 52 is fixedly disposed on the shaft lever 19, and the third gear 52 is meshed with the second gear 51 through a toothed chain 53.

When the river mouth depressurization oil-gas mixing and conveying device is used: firstly, the rotary jet pump 5 is placed at the position of an oil well, then a material taking pipe 6 at one end of the rotary jet pump 5 is inserted into the oil well, a three-way pipe 7 at the other end of the rotary jet pump 5 is connected with the end part of an oil inlet pipe 8, and at the moment, the connection of one end of the rotary jet pump 5 between a first buffer tank and a second buffer tank can be realized.

After the connection of the rotary jet pump 5 is completed, a motor 20 in the pushing component is started at the moment, the motor 20 starts to drive a rotating rod 23 at the output end to rotate, the rotating rod 23 rotates to drive a first gear 18 fixed on the outer side of the rotary jet pump to rotate, the first gear 18 rotates to be meshed with a toothed plate 16 on one side to move, when the toothed plate 16 moves to the end, the first gear 18 stirs a spring piece 17 at the end of the toothed plate 16, when the toothed plate 16 moves, a connecting rod 15 and a fixing rod 14 can be driven to drive a push rod 12 to move in the same direction, one end of the push rod 12 is separated from one side of a buffer plate 10, at the moment, the push rod 12 loses extrusion pushing to the buffer plate 10, when the push rod 12 is pulled, a stop 22 on the surface of the push rod is driven to synchronously move, and the stop 22 moves to enable a first spring 21 on the push rod 12 to be extruded, so that the first spring 21 is extruded between the stop 22 and the screen 13.

The motor 20 starts simultaneously and starts simultaneously to the rotary jet pump 5, the rotary jet pump 5 starts to drive the main shaft inside the rotary jet pump to rotate, the main shaft drives the rotor cavity to rotate, the collecting pipe in the middle is enabled to be static, an opening is formed in the top end of the collecting pipe and along the tangential direction of the rotor cavity, namely, the inlet port of the collecting pipe, the rotor cavity rotates to drive the impeller to rotate, petroleum is sucked into the rotor cavity, under the action of the impeller rotating in the rotor cavity, the petroleum is thrown to the edge of the rotor cavity, then enters the inlet port of the collecting pipe, the collecting pipe collects high kinetic energy liquid in the rotor cavity, and kinetic energy of the petroleum is converted into pressure energy to be output by the three-way pipe 7 and enter the first buffer tank 2 or the second buffer tank 3.

The push rod 12 is driven by the first gear 18 and the toothed plate 16 to be separated from the buffer plate 10, the buffer plate 10 is not pushed and extruded any more, at this time, the rotary jet pump 5 is started to press petroleum into the three-way pipe 7, then the petroleum is discharged from the oil inlet pipe 8 communicated with the end part of the three-way pipe 7, when the petroleum enters the three-way pipe 7, the petroleum enters the oil inlet pipe 8 communicated with the two ends of the three-way pipe 7, one of the oil inlet pipes 8 is blocked by the switching pressure relief switching assembly, and the petroleum is output from one of the oil inlet pipes 8 to enter the first buffer tank 2 or the second buffer tank 3.

When the oil inlet pipe 8 at one end of the first buffer tank 2 is plugged into the cavity 33 in the first fixed block 30, the oil inlet pipe 8 communicated with the first buffer tank 2 is plugged, the second intercepting column 29 on the oil outlet pipe 31 communicated with one side of the first buffer tank 2 is positioned in the cavity 33 of the second fixed block 32, so that the oil outlet pipe 31 communicated with the lower part of the first buffer tank 2 is in an open state, and the oil collected in the first buffer tank 2 is discharged into the collecting tank 1 through the oil outlet pipe 31, so that the pressure relief in the first buffer tank 2 is realized; the first intercepting column 28 on the oil inlet pipe 8 at one end of the second buffer tank 3 is located inside the cavity 33 of the first fixed block 30 and far away from the end of the oil inlet pipe 8, at this time, the oil inlet pipe 8 at one end of the second buffer tank 3 is in an open state, the second intercepting column 29 on the oil outlet pipe 31 communicated with the bottom of the second buffer tank 3 plugs the end of the oil outlet pipe 31, at this time, the second buffer tank 3 and the collecting tank 1 are plugged, at this time, the petroleum in the three-way pipe 7 enters the oil inlet pipe 8 at one end of the second buffer tank 3 and then enters the second buffer tank 3, and thus the collection of the petroleum pumped by the rotary jet pump 5 can be realized.

When the oil inlet pipe 8 on the second buffer tank 3 is blocked by the first intercepting column 28, oil in the three-way pipe 7 cannot enter the second buffer tank 3 from the oil inlet pipe 8, meanwhile, the oil outlet pipe 31 on the second buffer tank 3 is not blocked by the second intercepting column 29, and at the moment, the oil outlet pipe 31 on the second buffer tank 3 is communicated with the collecting tank 1, so that the oil collected in the second buffer tank 3 is discharged into the collecting tank 1, and the effect of pressure relief on the second buffer tank 3 can be realized; and when the oil inlet pipe 8 tip on the first buffer tank 2 does not receive the shutoff of first shutoff post 28 at this moment, oil inlet pipe 8 on the first buffer tank 2 is open state, oil in three-way pipe 7 will enter into first buffer tank 2 through oil inlet pipe 8 on the first buffer tank 2, realize the collection of first buffer tank 2 to oil, and the oil drain pipe 31 of intercommunication on the first buffer tank 2 receives the shutoff of second shutoff post 29, at this moment, do not communicate between first buffer tank 2 and the collection tank 1, through addding the pressure release cutting subassembly, can realize discharging into first, in the second buffer tank in turn to the oil that pump 5 was taken out to the rotary jetting, avoid the too big transport efficiency to the oil of pump 5 to the oil of influence in the first, the too big pressure that causes of second buffer tank 3 inside simultaneously, this mode can effectually improve the efficiency of rotary jetting pump to oil transport, the security of oil and oil extraction mixed transportation has been improved to the oil simultaneously.

In order to realize the automatic switching of the pressure relief switching assembly by additionally arranging the intermittent driving assembly for auxiliary work, when the oil inlet pipe 8 on the first buffer tank 2 is opened, the oil outlet pipe 31 on the first buffer tank 2 is blocked by the second intercepting column 29, the oil inlet pipe 8 on the second buffer tank 3 is blocked by the first intercepting column 28, the oil outlet pipe 31 on the second buffer tank 3 is not blocked, at the moment, the second buffer tank 3 is in a pressure relief state, the oil collected in the second buffer tank 3 is discharged into the collecting tank 1 under the action of gravity, meanwhile, the oil in the three-way pipe 7 enters the first buffer tank 2 through the oil inlet pipe 8 on the first buffer tank 2, the oil entering the first buffer tank 2 is discharged by the oil outlet cover 9, And collide with the buffer plate 10 in the first buffer tank 2, oil gas can be separated from petroleum during collision and is positioned at the upper layer inside the first buffer tank 2, the upper layer of oil gas can be conveyed into the collecting tank 1 by the exhaust component to reduce the air pressure in the first buffer tank 2, the conveying of the petroleum by the rotary jet pump 5 is convenient, the collided petroleum can be returned to the bottom of the first buffer tank 2 under the action of gravity, when the rotary jet pump 5 continuously conveys the petroleum into the first buffer tank 2, the petroleum liquid level in the first buffer tank 2 is raised at the moment, the lifting effect of the petroleum liquid level can be realized on the floating plate 45 in the first buffer tank 2, The floating plate 45 is lifted, the floating plate 45 slides on the vertical rods 44, the lifting rod 46 at one side of the floating plate 45 can be driven to synchronously move while the floating plate 45 is lifted, the lifting rod 46 can drive the top plate 47 at one end to move, the top plate 47 is lifted below the transverse plate 36 and is contacted with the transverse plate 36, when the liquid level is continuously lifted, the floating plate 45 drives the lifting rod 46 and the top plate 47 to lift, the top plate 47 can push the transverse plate 36 upwards, the transverse plate 36 moves upwards, the transverse plate 36 can drive the bearing sleeve 35 on the rotating rod 23 to move upwards while the transverse plate 36 moves upwards, and when the bearing sleeve 35 moves upwards, the sliding blocks 39 in the U-shaped grooves 38 at two ends of the transverse block 37 are pushed by the movable rod 41, The extrusion block 40 fixedly connected with one end of the sliding block 39 is made to approach the inner wall of the circular ring 43, the clamping groove 63 on the side wall of the extrusion block 40 is clamped into the clamping groove 63 on the inner wall of the circular ring 43, extrusion connection between the extrusion block 40 and the circular ring 43 can be realized at the moment, because one end of the circular ring 43 is fixed on the first gear 18, the first gear 18 is continuously driven to rotate by the motor 20, the first gear 18 can rotate to drive the circular ring 43 to rotate, at the moment, because the extrusion block 40 is fixedly connected with the circular ring 43 in an extrusion way, the rotation of the circular ring 43 can be realized, the extrusion block 40 can be driven to rotate, the transverse block 37 is driven to rotate by the rotation of the extrusion block 40, because one side of the transverse block 37 is fixedly connected with the rotating rod 23, the rotating rod 23 can be driven to rotate the L-shaped rod 24 at the other end, the L-shaped rod 24 rotates to push the push groove 25 to move, at the moment, the L-shaped rod 24 pushes the push groove 25 to the other side, the cross rod 27 drives the linkage rod 26 to move, the positions of the first intercepting column 28 and the second intercepting column 29 in the first fixed block 30 and the second fixed block 32 are changed, at the moment, the oil inlet pipe 8 on the first buffer tank 2 is blocked by the first intercepting column 28, the oil outlet pipe 31 on the first buffer tank 2 is not blocked by the second intercepting column 29, At this time, the oil in the first buffer tank 2 is discharged in a decompression way, the oil inlet pipe 8 on the second buffer tank 3 is not blocked by the first intercepting column 28, the oil outlet pipe 31 on the second buffer tank 3 is blocked by the second intercepting column 29, at this time, the three-way pipe 7 conveys the oil to the inside of the second buffer tank 3, when the L-shaped rod 24 is driven by the rotating rod 23 to rotate so as to move the pushing groove 25, the movement of the linkage rod 26 is realized, after the movement of the linkage rod 26 drives the first intercepting column and the second intercepting column is completed, the transverse plate 36 is separated from the top plate 47 on the first buffer tank 2, after the transverse plate 36 is separated from the top plate 47, the second spring 60 between the supporting block 34 and the bearing sleeve 35 releases the spring potential energy, The bearing sleeve 35 is pushed to descend, the movable rod 41 is used for pulling the extrusion block 40 and the circular ring 43 to separate, the circular ring 43 does not drive the transverse block 37 to rotate after the extrusion block 40 and the circular ring 43 are separated, the rotating rod 23 does not rotate, namely the L-shaped rod 24 does not rotate any more, the transverse plate 36 moves to one side of the second buffer tank 3 and is positioned above the top plate 47 on the second buffer tank 3, the liquid level in the second buffer tank 3 is waited to rise, the floating plate 45 is driven to rise to push the transverse plate 36, the extrusion block 40 and the circular ring 43 are extruded and fixed again, the rotating rod 23 is driven to rotate, the movement of the linkage rod 26 is realized, the movement of the first intercepting column and the second intercepting column is realized, the switching and the pressure relief of petroleum stored between the first buffer tank 2 and the second buffer tank 3 are realized, the first buffer tank and the second buffer tank are used for alternately storing oil and releasing pressure, the safety of the rotary jet pump 5 on oil transportation is realized, the phenomenon that the rotary jet pump 5 is too high in oil liquid level or too high in pressure in the first buffer tank and the second buffer tank affects the transportation of the rotary jet pump 5 is avoided, meanwhile, the backflow of the extracted oil caused by too high pressure in the first buffer tank and the second buffer tank is avoided, and the safety of oil transportation is effectively improved.

The exhaust assembly can discharge the oil gas in the first tank body and the second tank body into the collecting tank 1, the air pressure in the first buffer tank and the second buffer tank can be reduced, the motor 20 starts to drive the third gear 52 on the shaft lever 19 to rotate, the third gear 52 drives the second gear 51 to rotate through the toothed chain 53, the second gear 51 can drive the transmission rod 50 to rotate, the transmission rod 50 rotates to drive the induced air blade 49 at one end to rotate, and the induced air blade 49 is arranged in the induced air cover 48 and communicated with one end of the oil gas pipe 4, so that the oil gas carried in the oil in the first buffer tank and the oil gas pipe can be introduced into the collecting tank 1, the pressure in the first buffer tank and the second buffer tank is reduced, the influence of the oil gas on the pressure in the first buffer tank and the second buffer tank is reduced, and the efficiency of the rotary jet pump 5 on oil conveying is improved.

After the petroleum extraction and transportation are completed, the rotary jet pump 5 is required to be stopped at the moment, the motor 20 is stopped, the motor 20 is rotated reversely to drive the shaft lever 19 at the output end to rotate reversely, the shaft lever 19 is rotated reversely to drive the first gear 18 to rotate reversely, the toothed plate 16 is meshed to drive the toothed plate 16 to move reversely, the push rod 12 is driven to move reversely by the connecting rod 15 and the fixing rod 14, the buffer plate 10 in the first buffer tank and the second buffer tank is pushed, the buffer plate 10 is moved towards one end close to the oil inlet pipe 8, the plugging block 11 at one side of the buffer plate 10 is used for plugging the oil outlet cover 9, the oil inlet pipe 8 can be plugged, at the moment, the rotary jet pump 5 stops working, the petroleum in the first buffer tank and the second buffer tank is prevented from flowing reversely when the pressure in the first buffer tank or the second buffer tank is higher than the pressure in the rotor cavity of the rotary jet pump 5, and the safety of petroleum storage in the first buffer tank and the second buffer tank is improved.

Example 2

Referring to fig. 1-13, this embodiment further illustrates embodiment 1, in which a collection tank 1, a jet pump 5, a buffer plate 10, a pushing component, a pressure release switching component, an intermittent driving component and an oil gas discharging component are illustrated, a first buffer tank 2 and a second buffer tank 3 are disposed above the collection tank 1, one ends of the first buffer tank 2 and the second buffer tank 3 are both communicated with the collection tank 1 through an oil pipe 4, bottoms of the first buffer tank 2 and the second buffer tank 3 are both communicated with the collection tank 1 through an oil drain pipe 31, the jet pump 5 is mounted on one side of the collection tank 1 and is used for extracting oil in the ground, one end of the jet pump 5 is communicated with a material taking pipe 6, the other end of the jet pump 5 is communicated with a three-way pipe 7, the other two ends of the three-way pipe 7 are respectively communicated with one ends of the first buffer tank 2 and the second buffer tank 3 through an oil inlet pipe 8, one ends of the oil inlet pipe 8 are communicated with an oil outlet cover 9, the buffer plate 10 is mounted inside the first buffer tank 2 and the second buffer tank 3, an oil outlet cover 9 is discharged from the first buffer tank 2 and the second buffer tank 9, one side of the buffer tank 10 is equipped with an oil release block 11 for alternately being mounted on the buffer tank 2 and the first buffer tank 3, the first buffer tank 2 and the pressure release component is alternately pushed to the first buffer tank 2 and the second buffer tank 3 is mounted on one side of the buffer tank 3, the first buffer tank 2 is alternately pushed and the buffer tank 3 is mounted with the buffer plate 3 is alternately is mounted with the buffer block 11, the buffer plate 3 is plugged 1 is plugged, the first buffer component is plugged 1 is plugged with the buffer component is plugged 1 and is plugged with the buffer component is 2 and the buffer assembly is 2 is plugged 1, the oil tank 2 is plugged 1 and the assembly is sealed 1 and the assembly is 3, introducing oil gas in the first buffer tank 2 and the second buffer tank 3 into the collecting tank 1, and connecting an oil gas discharge assembly with a pushing assembly;

Referring to fig. 6, 7 and 13, guide rails 54 are fixedly arranged inside the first buffer tank 2 and the second buffer tank 3 in the drawings, guide blocks 55 are slidably arranged inside the guide rails 54, and one side of each guide block 55 is fixedly connected with the top of the buffer plate 10;

Referring to fig. 4,5 and 8, the outer side of the rotating rod 23 in the drawing is rotatably sleeved with a bearing bracket 56, and the bearing bracket 56 is fixedly connected with the outer side walls of the first buffer tank 2 and the second buffer tank 3 through a bracket 57.

In this embodiment, the guide rail 54 is disposed inside the first and second buffer tanks, the guide block 55 is slidably disposed inside the guide rail 54, and one end of the guide block 55 is fixedly connected to the buffer plate 10, so that the buffer plate 10 can be supported, and the suspended placement of the buffer plate 10 is avoided, and the safety of placement inside the first and second buffer tanks is improved; the bearing bracket 56 is sleeved on the outer side of the rotating rod 23, the bearing bracket 56 is fixedly connected with the outer side walls of the first buffer tank and the second buffer tank through the support 57, the support 57 can play a role in supporting the bearing bracket 56, the bearing bracket 56 can play a role in rotatably supporting the rotating rod 23, the stability of the rotating rod 23 placed below the shaft rod 19 is improved, and meanwhile the rotating safety of the rotating rod 23 is improved.

Example 3

Referring to fig. 1-13, this embodiment further illustrates other examples, in which a collecting tank 1, a jet pump 5, a buffer plate 10, a pushing component, a pressure release switching component, an intermittent driving component and an oil gas discharging component are illustrated, a first buffer tank 2 and a second buffer tank 3 are disposed above the collecting tank 1, one ends of the first buffer tank 2 and the second buffer tank 3 are respectively communicated with the collecting tank 1 through an oil pipe 4, bottoms of the first buffer tank 2 and the second buffer tank 3 are respectively communicated with the collecting tank 1 through an oil drain pipe 31, the jet pump 5 is mounted on one side of the collecting tank 1 and is used for extracting underground oil, one end of the jet pump 5 is communicated with a material taking pipe 6, the other end of the jet pump 5 is communicated with a three-way pipe 7, the other two ends of the three-way pipe 7 are respectively communicated with one ends of the first buffer tank 2 and the second buffer tank 3 through an oil inlet pipe 8, one end of the oil inlet pipe 8 is communicated with an oil outlet cover 9, a buffer plate 10 is arranged in the first buffer tank 2 and the second buffer tank 3, oil discharged from the oil outlet cover 9 is buffered, a plugging block 11 is fixedly arranged on one side of the buffer plate 10, the plugging block 11 plugs the oil outlet cover 9, a pushing component is arranged in the first buffer tank 2 and the second buffer tank 3 and is used for pushing the buffer plate 10, the plugging block 11 plugs the oil outlet cover 9, a pressure relief switching component is arranged in the first buffer tank 2 and the second buffer tank 3 and is used for alternately switching and pressure relief of oil collected in the first buffer tank 2 and the second buffer tank 3 and discharging the oil into the collecting tank 1, an intermittent driving component is arranged above the pressure relief switching component and is used for connecting the pushing component and the pressure relief switching component, the oil-gas discharging component is arranged in the first buffer tank 2 and the second buffer tank 3, the oil gas in the first buffer tank 2 and the second buffer tank 3 is introduced into the collecting tank 1, and the oil gas discharging component is connected with the pushing component.

Referring to fig. 1, a rack 58 is provided below the motor 20 in the drawing, and the rack 58 is mounted on the top of the collection tank 1;

referring to fig. 1, some of the toothed plates 16 in the drawings are provided with sliding rails 59, the toothed plates 16 are slidably disposed inside the toothed plates 16, and the sliding rails 59 are fixedly connected with the frame 58.

Referring to fig. 1, a collection tank 1 is shown with an oil discharge pipe 61 and an air discharge pipe 62, and control valves are provided on the oil discharge pipe 61 and the air discharge pipe 62.

In this embodiment, install frame 58 in the top of collection tank 1, frame 58 can play the effect of supporting motor 20, increase motor 20 and place the security of using, avoid motor 20's unsettled placing, the inside of slide rail 59 is located in one side slip of pinion rack 16, can play the effect of supporting pinion rack 16, increase the security of using is placed to pinion rack 16, increase the gliding stability of pinion rack 16, avoid unsettled placing of pinion rack 16, with slide rail 59 fixed mounting in the below of frame 58 during the installation, can play the effect of supporting to slide rail 59, increase the security of using is placed to slide rail 59, the unsettled placing of slide rail 59 has been avoided simultaneously.

The oil and gas in the collection tank 1 can be discharged through the oil discharge pipe 61 and the gas discharge pipe 62 arranged on one side of the collection tank 1, when the oil discharge pipe 61 and the gas discharge pipe 62 are installed, a liquid level sensor is arranged in the collection tank 1, a pressure gauge is arranged on the top of the collection tank 1 in a communicating mode, the liquid level sensor and the pressure gauge are electrically connected with a controller, one end of the oil discharge pipe 61 is connected with an oil pump and one end of the gas discharge pipe 62 is connected with a gas suction device, the oil pump and the gas suction device are electrically connected with the controller, after the position of the oil in the collection tank 1 reaches the liquid level sensor or the pressure sensor communicated with the collection tank 1 reaches a preset value, the controller starts the gas suction device and the oil pump to work, oil in the oil storage device of the oil channel in the collection tank 1 is stored and the oil gas is pumped into a filtering device to be filtered, the oil and gas in the collection tank 1 can be conveniently processed in time, and the oil and the gas in the collection tank 1 is prevented from being excessively or the gas in the first buffer tank and the second buffer tank from being excessively affecting the gas pressure of the oil and the gas in the collection tank 1.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present 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 therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a wellhead falls back pressure oil gas and mixes transportation device which characterized in that includes:

The collecting tank (1), a first buffer tank (2) and a second buffer tank (3) are arranged above the collecting tank (1), one ends of the first buffer tank (2) and the second buffer tank (3) are communicated with the collecting tank (1) through oil pipes (4), and bottoms of the first buffer tank (2) and the second buffer tank (3) are communicated with the collecting tank (1) through oil pipes (31);

The rotary spraying pump (5) is arranged on one side of the collecting tank (1) and used for extracting underground petroleum, a material taking pipe (6) is arranged at one end of the rotary spraying pump (5) in a communicating manner, the other end of the rotary spraying pump (5) is communicated with the three-way pipe (7), the other two ends of the three-way pipe (7) are respectively communicated with one ends of the first buffer tank (2) and the second buffer tank (3) through an oil inlet pipe (8), and an oil outlet cover (9) is arranged at one end of the oil inlet pipe (8) in a communicating manner;

The buffer plate (10) is arranged in the first buffer tank (2) and the second buffer tank (3) and used for buffering petroleum discharged by the oil outlet cover (9), one side of the buffer plate (10) is fixedly provided with a plugging block (11), and the plugging block (11) is used for plugging the oil outlet cover (9);

The pushing assembly is arranged in the first buffer tank (2) and the second buffer tank (3) and is used for pushing the buffer plate (10) to enable the plugging block (11) to plug the oil outlet cover (9);

The pressure release switching assembly is arranged in the first buffer tank (2) and the second buffer tank (3) and is used for alternately switching and releasing the petroleum collected in the first buffer tank (2) and the second buffer tank (3) and discharging the petroleum into the collecting tank (1);

The intermittent driving assembly is arranged above the pressure relief switching assembly and is used for connecting the pushing assembly and the pressure relief switching assembly;

The oil gas discharging assembly is arranged inside the first buffer tank (2) and the second buffer tank (3), oil gas inside the first buffer tank (2) and the second buffer tank (3) is led into the collecting tank (1), and the oil gas discharging assembly is connected with the pushing assembly.

2. The wellhead drop back pressure oil-gas mixing transportation device according to claim 1, characterized in that the pushing component comprises a pushing rod (12) arranged inside the first buffer tank (2) and the second buffer tank (3), the pushing rod (12) sequentially penetrates through the screen plate (13) and the first buffer tank (2) and the second buffer tank (3) and extends to the outside to be fixedly connected with the fixing rod (14), a connecting rod (15) is fixedly arranged on one side of the fixing rod (14), a toothed plate (16) is fixedly arranged at one end of the connecting rod (15), a spring piece (17) is fixedly arranged at one end of the toothed plate (16), a first gear (18) is meshed at one side of the toothed plate (16), the first gear (18) is fixedly sleeved on the shaft rod (19), one end of the shaft rod (19) is connected with the output end of the motor (20), the screen plate (13) is fixedly arranged inside the first buffer tank (2) and the second buffer tank (3), a spring (21) is arranged on one side of the screen plate (13), and a stop piece (21) is arranged on one side of the pushing rod (12).

3. The wellhead drop back pressure oil-gas mixing transportation device according to claim 2, characterized in that the pressure relief switching assembly comprises a rotating rod (23) arranged below the shaft rod (19), one end of the rotating rod (23) is fixedly provided with an L-shaped rod (24), one end of the L-shaped rod (24) is slidably arranged in a pushing groove (25), both sides of the pushing groove (25) are respectively provided with a linkage rod (26), the linkage rods (26) are fixedly connected with the end part of the pushing groove (25) through a cross rod (27), and both ends of the linkage rods (26) are respectively fixedly provided with a first intercepting column (28) and a second intercepting column (29);

The pressure release switching assembly further comprises a first fixed block (30) fixedly arranged on the oil inlet pipe (8), a second fixed block (32) is fixedly arranged on the oil outlet pipe (31), cavities (33) communicated with the oil inlet pipe (8) and the oil outlet pipe (31) are respectively formed in the first fixed block (30) and the second fixed block (32), and the first intercepting column (28) and the second intercepting column (29) are respectively and slidably arranged in the first fixed block (30) and the second fixed block (32).

4. The wellhead drop back pressure oil-gas mixing transportation device according to claim 3, wherein the intermittent driving assembly comprises a supporting block (34) fixedly sleeved on the outer side of the rotating rod (23), a bearing sleeve (35) is rotatably sleeved on the upper side of the supporting block (34) and positioned on the outer side of the rotating rod (23), a second spring (60) is sleeved between the bearing sleeve (35) and the supporting block (34) and positioned on the rotating rod (23), transverse plates (36) are fixedly arranged on two sides of the bearing sleeve (35), transverse blocks (37) are fixedly arranged at one end, far away from the L-shaped rod (24), of the rotating rod (23), U-shaped grooves (38) are formed at two ends of the transverse blocks (37), a sliding block (39) is arranged in the U-shaped grooves (38), a squeezing block (40) is fixedly arranged on one side of the sliding block (39), a movable rod (41) is arranged on one side of the sliding block (39), two ends of the movable rod (41) are respectively connected with the sliding block (39) and the bearing sleeve (35) through a hinge shaft (42), the two ends of the movable rod (41) are respectively connected with a circular gear (43) at one side of the first circular ring (43), clamping grooves (63) are formed in one side of the extrusion block (40) and the inner wall of the circular ring (43);

the intermittent drive assembly further comprises a vertical rod (44) fixedly arranged inside the first buffer tank (2) and the second buffer tank (3), a floating plate (45) is sleeved on the vertical rod (44) in a sliding mode, a push rod (46) is fixedly arranged on one side of the floating plate (45), one end of the push rod (46) penetrates through the first buffer tank (2) or the second buffer tank (3) and extends outwards to be fixedly connected with a top plate (47), and the top plate (47) is located below the transverse plate (36).

5. The wellhead back pressure drop oil-gas mixing transportation device according to claim 2, wherein the oil-gas discharge assembly comprises an induced air cover (48) arranged inside the first buffer tank (2) and the second buffer tank (3), one end of the induced air cover (48) is communicated with the oil gas pipe (4), an induced air blade (49) is arranged inside the induced air cover (48), the induced air blade (49) is fixedly arranged on a transmission rod (50), one end of the transmission rod (50) penetrates through the oil gas pipe (4) and extends outwards to be fixedly connected with a second gear (51), a third gear (52) is fixedly arranged on the shaft rod (19), and the third gear (52) is meshed and connected with the second gear (51) through a toothed chain (53).

6. The wellhead back pressure reduction oil-gas mixing transmission device according to claim 1, wherein guide rails (54) are fixedly arranged inside the first buffer tank (2) and the second buffer tank (3), guide blocks (55) are slidably arranged inside the guide rails (54), and one side of each guide block (55) is fixedly connected with the top of the buffer plate (10).

7. A wellhead back pressure reduction oil-gas mixing transmission device according to claim 3, characterized in that a bearing bracket (56) is sleeved on the outer side of the rotating rod (23), and the bearing bracket (56) is fixedly connected with the outer side walls of the first buffer tank (2) and the second buffer tank (3) through a bracket (57).

8. The wellhead back-pressure-reducing oil-gas mixing transmission device according to claim 2, characterized in that a frame (58) is arranged below the motor (20), and the frame (58) is mounted on the top of the collecting tank (1).

9. The wellhead back pressure reduction oil and gas mixing and conveying device according to claim 8, wherein some of the toothed plates (16) are provided with sliding rails (59), the toothed plates (16) are slidably arranged in the toothed plates (16), and the sliding rails (59) are fixedly connected with the frame (58).

10. The wellhead back-pressure-reducing oil-gas mixing and conveying device according to claim 1, wherein an oil unloading pipe (61) and an air release pipe (62) are arranged on the collecting tank (1), and control valves are arranged on the oil unloading pipe (61) and the air release pipe (62).