Energy-saving pressure-reducing conveying device of beam-pumping unit

Abstract

The utility model belongs to the technical field of energy conservation, consumption reduction and conveying of beam-pumping unit wells in oil fields, and discloses an energy-saving and pressure-reducing conveying device of a beam-pumping unit, which comprises a base, the beam-pumping unit is arranged on the base, and a connecting assembly is arranged at the position close to one end of the beam-pumping unit. A piston pump assembly is fixedly installed at the other end of the connecting assembly, the other end of the piston pump assembly is rotationally installed on the base at the same time, the side wall, close to the connecting assembly, of the piston pump assembly is communicated with an overflow pipe assembly, the other end of the piston pump assembly is further communicated with a process manifold, and a control box is further installed at the position, close to the beam-pumping unit, of the base. The device is simple in overall structure, feedback energy can be directly used for production operation, energy conversion links are reduced, meanwhile, the requirement for reducing the pressure of oil well produced liquid is met, and therefore stable operation of equipment is guaranteed, and the using effect is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of energy conservation, consumption reduction and transportation of beam pumping units in oil fields. Specifically, it relates to an energy-saving and pressure-reducing transportation device for beam pumping units. Background Technique

[0002] The beam pumping unit is one of the main types of mechanical oil production equipment currently used in oil fields. It mainly consists of four major parts: the donkey head - beam - connecting rod - crank mechanism, the reducer, the power equipment and the auxiliary equipment. During operation, the rotation of the motor is converted into the up-and-down reciprocating motion of the donkey head through the reducer and the crank connecting rod mechanism. The donkey head drives the plunger of the downhole oil pump to move up and down through the polished rod and the sucker rod, so as to continuously pump the fluid in the well out of the wellbore.

[0003] The main application characteristics of the beam pumping unit are as follows: The beam pumping unit has the characteristics of reliable performance, simple structure, convenient operation and maintenance, and mature technology; the overall structure is reasonable, the operation is stable, the noise is small, and the operation and maintenance are convenient; the beam is selected as a box structure or an I-beam structure, with high strength, good rigidity and large load-bearing capacity; the reducer adopts herringbone involute gears or double circular arc tooth profile gears for transmission, with high machining accuracy, strong load-bearing capacity and long service life; the donkey head adopts one of the three forms of upward turning, upward hanging or side turning; the brake adopts an external clamping structure, equipped with a safety device, with flexible operation, rapid braking and reliable safety; the base adopts two connection methods of anchor bolt connection or pressure bar connection.

[0004] The beam pumping unit is also provided with a balance device. Due to the uneven suspension point load during the up and down strokes of the pumping unit, when the pumping unit is on the upstroke, the balance device rotates downward to help overcome the load on the donkey head; when it is on the downstroke, the motor makes the balance device move upward to store energy, thereby reducing the load difference between the up and down strokes of the pumping unit and ensuring the normal operation of the equipment. The balance methods adopted include beam balance, crank balance, compound balance, pneumatic balance, etc. However, these balance methods all have disadvantages in use: small application range, large load and centrifugal force on the crank, complex operation, high precision requirements, etc.

[0005] Since the pumping unit does work and consumes energy during the upstroke, and does negative work during the downstroke and needs to store energy, this is the main purpose of balancing. Due to the increasing complexity of geological conditions, reservoir conditions, fluid properties, downhole equipment, fluid flow, etc., the working conditions of the downhole oil pump are in a dynamic operation state. First, its balance device is difficult to meet the requirements of dynamic working conditions. Second, the balance energy storage requires secondary conversion, consuming energy. Therefore, it is necessary to design a pumping unit that does work during both the up and down strokes, without secondary energy conversion, simplifies the intermediate links, not only saves energy but also reduces the workload of adjusting the balance. Content of the Utility Model

[0006] The main technical problem to be solved by the present utility model is to provide a beam pumping unit energy-saving and pressure-reducing transportation device with a simple overall structure, which can directly use the feedback energy for production operation, reduce the energy conversion link, and meet the requirement of reducing the pressure of the produced fluid in the oil well, so as to ensure the stable operation of the equipment and improve the production efficiency of the system.

[0007] To solve the above technical problems, the present utility model provides the following technical solutions:

[0008] A beam pumping unit energy-saving and pressure-reducing transportation device, including a base, a beam pumping unit is arranged on the base. A connecting component is arranged at a position close to one end of the beam pumping unit. The other end of the connecting component is fixedly installed with a piston pump component. The other end of the piston pump component is also rotatably installed on the base at the same time. An overflow pipe component is communicated with the side wall of the piston pump component close to the connecting component. The other end of the piston pump component is also communicated with a process manifold. A control box is also installed on the base close to the beam pumping unit.

[0009] The following is the further optimization of the above technical solutions by the present utility model:

[0010] The piston pump component includes a piston rod fixedly connected to the other end of the connecting component. The other end of the piston rod is fixedly installed with a piston. The outer surface of the piston is sleeved with a cylinder body. The outer surface of the piston is in sealed sliding connection with the inner wall of the cylinder body. The length of the cylinder body is larger than the stroke of the piston rod.

[0011] Further optimization: An upper cylinder head is hermetically installed at the end of the cylinder body close to the connecting component. An overflow hole is opened at a position on the outer surface of the cylinder body close to the upper cylinder head. The other end of the cylinder body far from the upper cylinder head is hermetically connected with a lower cylinder head.

[0012] Further optimization: A three-way hollow rotating shaft is communicated with the lower cylinder head. One end of the three-way hollow rotating shaft is communicated with the inside of the cylinder body. The other two ends of the three-way hollow rotating shaft are rotatably connected with rotating brackets through bearings. The two rotating brackets are vertically arranged on the base at the same time.

[0013] Further optimization: The overflow pipe component includes a hose communicated with the overflow hole. The other end of the hose is communicated with an overflow pipe. The overflow pipe is also fixedly installed on the base. The other end of the overflow pipe is communicated with a pressure sensor.

[0014] Further optimization: The process manifold includes a buffer pipe communicated with one of the other two ends of the three-way hollow rotating shaft. A connecting pipe is communicated with the buffer pipe at a position close to the upper end. An electric valve is arranged on the connecting pipe.

[0015] Further optimization: The other end of the connecting pipe is communicated with an inlet pipe and an outlet pipe at the same time. An inlet valve is arranged on the inlet pipe. A check valve is arranged on the outlet pipe.

[0016] Further optimization: A control system for controlling the operation of the device is provided inside the control box, and the control ends of the inlet valve, the electric valve, and the pressure sensor are electrically connected to the control system.

[0017] With the above technical solution, the utility model utilizes the hydraulic principle to convert the work of the downward stroke of the beam pumping unit into hydraulic energy through the piston pump assembly, which directly acts on the transportation of the produced fluid in the oil well, improving the energy conversion efficiency and utilization rate, and at the same time reducing the labor intensity of adjusting the balance.

[0018] In the device, the piston pump assembly and the process pipeline are set as independent transportation devices through the action of the connection assembly, reducing the working load of the beam pumping unit, extending the service life of the underground oil production assembly in the oil well, improving the efficiency of the downhole oil pump, and at the same time reducing the environmental pollution caused by the leakage of the sucker rod stuffing box.

[0019] When the beam rotates clockwise, the donkey head moves upward, making the space volume between the piston and the three-way hollow rotating shaft larger and the pressure smaller. At the same time, the control system controls the inlet valve and the electric valve to be in the open state. Then, the produced fluid from the wellhead is transported through the inlet pipe, the inlet valve, and the electric valve into the buffer pipe, and then enters the cylinder body through the driving port and the three-way hollow rotating shaft to complete the suction of the produced fluid from the oil well. When the beam rotates counterclockwise, the donkey head moves downward, making the space volume between the piston and the three-way hollow rotating shaft smaller and the pressure larger. At the same time, the control system controls the inlet valve to close and the electric valve to open. Under the action of the check valve, the produced fluid in the cylinder body enters the outlet pipe through the buffer pipe, the electric valve, and the check valve, so that the produced fluid is transported to the transport pipe to complete the transportation of the produced fluid from the oil well.

[0020] Moreover, during the use of the device, when the sliding seal between the piston and the cylinder body is damaged, the produced fluid from the oil well will enter the overflow pipe through the overflow hole. At this time, the pressure sensor detects the pressure change in the overflow pipe and feeds the signal back to the control system. The control system first controls the electric valve to close to prevent the produced fluid from the oil well from continuing to enter the cylinder body, and then controls the power equipment to stop, causing the beam pumping unit to stop working to prevent the produced fluid from overflowing and polluting the environment.

[0021] The following further illustrates the present utility model in conjunction with the drawings and embodiments. Description of the Drawings

[0022] Figure 1 It is a schematic diagram of the overall structure in the embodiment of the present utility model;

[0023] Figure 2 It is a schematic diagram of the structure of the connection assembly in the embodiment of the present utility model;

[0024] Figure 3 It is a sectional view of the piston pump assembly in the embodiment of the present utility model;

[0025] Figure 4 Schematic diagram of the installation of the three-way hollow rotating shaft in the embodiment of the present utility model;

[0026] Figure 5 Schematic diagram of the structure of the overflow pipe assembly in the embodiment of the present utility model;

[0027] Figure 6 Schematic diagram of the structure of the process pipeline assembly in the embodiment of the present utility model.

[0028] In the figure: 1 - Beam pumping unit; 11 - Base; 12 - Horsehead; 13 - Beam; 14 - Bracket; 15 - Link mechanism; 16 - Reducer; 17 - Power equipment; 2 - Connection assembly; 21 - Bearing seat; 22 - Rotating shaft; 23 - Connecting rod; 3 - Piston pump assembly; 31 - Piston rod; 32 - Piston; 33 - Upper cylinder head; 34 - Cylinder block; 35 - Lower cylinder head; 36 - Overflow hole; 37 - Three-way hollow rotating shaft; 38 - Rotating bracket; 4 - Process pipeline assembly; 41 - Liquid inlet pipe; 42 - Inlet valve; 43 - Liquid outlet pipe; 44 - Check valve; 45 - Electric valve; 46 - Buffer pipe; 47 - Driving port; 48 - Connecting pipe; 5 - Overflow pipe assembly; 51 - Hose; 52 - Overflow pipe; 53 - Pressure sensor; 6 - Control box. Detailed implementation manners

[0029] As Figures 1-6 shown: An energy-saving and pressure-reducing transportation device for a beam pumping unit includes a base 11, on which a beam pumping unit 1 is arranged. A connection assembly 2 is arranged at a position near one end of the beam pumping unit 1, and the other end of the connection assembly 2 is fixedly installed with a piston pump assembly 3. The other end of the piston pump assembly 3 is simultaneously rotatably installed on the base 11. An overflow pipe assembly 5 is communicated with the side wall of the piston pump assembly 3 near the connection assembly 2, and the other end of the piston pump assembly 3 is also communicated with a process pipeline assembly 4. A control box 6 is also installed on the base 11 near the beam pumping unit 1.

[0030] In this embodiment, the base 11 is directly placed on the ground for use.

[0031] The beam pumping unit 1 is a commonly used pumping device in the prior art, including a power equipment 17 fixedly installed at one end of the base 11. The power output end of the power equipment 17 is drivingly connected with a reducer 16. The power output end of the reducer 16 is connected with a link mechanism 15. The other end of the link mechanism 15 is connected with a beam 13. A bracket 14 is hinged on the outer surface of the beam 13 near the link mechanism 15, and the bracket 14 is vertically arranged on the base 11 at the same time. A horsehead 12 is installed at the other end of the beam 13.

[0032] As Figures 1-2As shown, the connection assembly 2 includes two symmetrically spaced bearing seats 21 fixedly installed on the walking beam 13.

[0033] A rotating shaft 22 is fixedly installed in the middle of the holes of the two bearing seats 21, and a connecting rod 23 is fixedly installed on the rotating shaft 22. With this design, the connecting rod 23 can rotate around the rotating shaft 22 on the bearing seats 21.

[0034] As Figures 3-4 shown, the piston pump assembly 3 includes a piston rod 31 fixedly connected to the other end of the connecting rod 23.

[0035] The other end of the piston rod 31 is fixedly installed with a piston 32, and the outer surface of the piston 32 is sleeved with a cylinder block 34, and the piston 32 can slide inside the cylinder block 34.

[0036] In this embodiment, the outer surface of the piston 32 and the inner wall of the cylinder block 34 are connected by sealed sliding. The specific sealing method is already well-known in the prior art and will not be elaborated here.

[0037] The cylinder block 34 is sealed and installed with an upper cylinder head 33 at the end close to the connection assembly 2, and the other end of the piston rod 31 penetrates through the upper cylinder head 33 and extends into the cylinder block 34 to be fixedly connected to the piston 32.

[0038] In this embodiment, the length of the cylinder block 34 is larger than the stroke of the piston rod 31. With this design, it is avoided that the piston 32 impacts the upper cylinder head 33 and causes damage.

[0039] An overflow hole 36 is opened at the position of the outer surface of the cylinder block 34 close to the upper cylinder head 33.

[0040] The other end of the cylinder block 34 far from the upper cylinder head 33 is sealed and connected with a lower cylinder head 35, and a three-way hollow rotating shaft 37 is communicated with the lower cylinder head 35.

[0041] One end of the three-way hollow rotating shaft 37 is communicated with the inside of the cylinder block 34, and the other two ends of the three-way hollow rotating shaft 37 are both rotatably connected with a rotating bracket 38 through bearings.

[0042] The two rotating brackets 38 are vertically arranged on the base 11 at the same time.

[0043] As Figure 5 shown, the overflow pipe assembly 5 includes a hose 51 communicated with the overflow hole 36.

[0044] The other end of the hose 51 is communicated with an overflow pipe 52, the overflow pipe 52 is fixedly installed on the base 11 at the same time, and the other end of the overflow pipe 52 is communicated with a pressure sensor 53.

[0045] As Figure 6As shown, the process manifold 4 includes a buffer pipe 46 connected to one of the other two ends of the three-way hollow rotating shaft 37. A driving port 47 is provided on the buffer pipe 46, that is, the driving port 47 is connected to one of the other two ends of the three-way hollow rotating shaft 37 through a pipeline.

[0046] The buffer pipe 46 is fixedly installed on the base 11 at the same time.

[0047] A connecting pipe 48 is connected to the buffer pipe 46 near the upper end. An electric valve 45 is provided on the connecting pipe 48, and the electric valve 45 can control the connection and closing of the connecting pipe 48.

[0048] The other end of the connecting pipe 48 is connected to a liquid inlet pipe 41 and a liquid outlet pipe 43 at the same time. An inlet valve 42 is provided on the liquid inlet pipe 41, and a check valve 44 is provided on the liquid outlet pipe 43.

[0049] The other end of the liquid inlet pipe 41 is connected to the delivery wellhead through a pipeline, and the liquid outlet pipe 43 is connected to an external delivery pipe.

[0050] A control system for controlling the operation of the device is provided in the control box 6. The control principle of the control system is already well-known in the prior art and will not be elaborated here.

[0051] The control ends of the inlet valve 42, the electric valve 45, and the pressure sensor 53 are electrically connected to the control system through wires.

[0052] During use, the control system controls the driving power device 17 to operate. Driven by the linkage mechanism 15, the walking beam 13 rotates on the support 14, driving the pony head 12 to move up and down. When the walking beam 13 rotates clockwise, the pony head 12 moves upward, driving the piston rod 31 to slide upward, and then the piston 32 slides upward along the inner wall of the cylinder block 34, so that the volume of the space between the piston 32 and the three-way hollow rotating shaft 37 becomes larger and the pressure becomes smaller. At the same time, the control system controls the inlet valve 42 and the electric valve 45 to be in the open state. Then, the produced liquid from the oil production wellhead enters the buffer pipe 46 through the liquid inlet pipe 41, the inlet valve 42, and the electric valve 45, and then enters the cylinder block 34 through the driving port 47 and the three-way hollow rotating shaft 37.

[0053] When the walking beam 13 rotates counterclockwise, the pony head 12 moves downward, driving the piston rod 31 to drive the piston 32 to slide downward along the inner wall of the cylinder block 34, so that the volume of the space between the piston 32 and the three-way hollow rotating shaft 37 becomes smaller and the pressure becomes larger. At the same time, the control system controls the inlet valve 42 to close and the electric valve 45 to open. Under the action of the check valve 44, the produced liquid in the cylinder block 34 enters the liquid outlet pipe 43 through the buffer pipe 46, the electric valve 45, and the check valve 44, so that the produced liquid is transported to the delivery pipe.

[0054] During the use of the device, when the sliding seal between the piston 32 and the cylinder block 34 is damaged, the produced oil will enter the overflow pipe 52 through the overflow hole 36. At this time, the pressure sensor 53 detects the pressure change in the overflow pipe 52 and feeds back the signal to the control system. The control system first controls the electric valve 45 to close to prevent the produced oil from continuing to enter the cylinder block 34, and then controls the power device 17 to stop, so that the beam pumping unit 1 stops working, avoiding the overflow of the produced oil and polluting the environment.

[0055] During the use of the device, the energy generated by the downward stroke of the walking beam 13 driving the horsehead 12 is converted into hydraulic energy by the piston pump assembly 3, improving the energy conversion efficiency.

[0056] For those of ordinary skill in the art, according to the teachings of the present invention, without departing from the principles and spirit of the present invention, the changes, modifications, substitutions and variations made to the embodiments still fall within the protection scope of the present invention.

Claims

1. A beam pumping unit energy-saving and pressure-reducing conveying device, comprising a base (11), characterized in that: A beam pumping unit (1) is arranged on a base (11); a connecting assembly (2) is arranged near one end of the beam pumping unit (1); a piston pump assembly (3) is fixedly mounted on the other end of the connecting assembly (2); the other end of the piston pump assembly (3) is rotatably mounted on the base (11); an overflow pipe assembly (5) is connected to the side wall of the piston pump assembly (3) near the connecting assembly (2); the other end of the piston pump assembly (3) is also connected to a process manifold (4); and a control box (6) is also installed on the base (11) near the beam pumping unit (1).

2. The energy-saving and pressure-reducing conveying device for a beam pumping unit according to claim 1 is characterized in that: The piston pump assembly (3) comprises a piston rod (31) fixedly connected to the other end of the connecting assembly (2); a piston (32) is fixedly mounted on the other end of the piston rod (31); a cylinder body (34) is sleeved on the outer surface of the piston (32); the outer surface of the piston (32) is sealingly and slidably connected to the inner wall of the cylinder body (34); and the length of the cylinder body (34) is greater than the stroke of the piston rod (31).

3. The energy-saving and pressure-reducing conveying device for a beam pumping unit according to claim 2 is characterized in that: An upper cylinder cover (33) is sealedly mounted on the end of the cylinder body (34) close to the connecting assembly (2); an overflow hole (36) is provided on the outer surface of the cylinder body (34) close to the upper cylinder cover (33); and a lower cylinder cover (35) is sealedly connected to the other end of the cylinder body (34) away from the upper cylinder cover (33).

4. The energy-saving and pressure-reducing conveying device for a beam pumping unit according to claim 3 is characterized in that: The lower cylinder cover (35) is connected to a three-way hollow rotating shaft (37), one end of which is connected to the inside of the cylinder body, and the other two ends of the three-way hollow rotating shaft (37) are rotatably connected to rotating brackets (38), and the two rotating brackets (38) are vertically arranged on the base (11) at the same time.

5. The energy-saving and pressure-reducing conveying device for a beam pumping unit according to claim 4 is characterized in that: The overflow pipe assembly (5) comprises a hose (51) connected to the overflow hole (36); the other end of the hose (51) is connected to an overflow pipe (52); the overflow pipe (52) is fixedly mounted on the base (11); the other end of the overflow pipe (52) is connected to a pressure sensor (53).

6. The energy-saving and pressure-reducing conveying device for a beam pumping unit according to claim 5 is characterized in that: The process manifold (4) comprises a buffer pipe (46) connected to one of the other two ends of the three-way hollow shaft (37), and the buffer pipe (46) is connected to a connecting pipe (48) near the upper end, and an electric valve (45) is arranged on the connecting pipe (48).

7. The energy-saving and pressure-reducing conveying device for a beam pumping unit according to claim 6 is characterized in that: The other end of the connecting pipe (48) is connected to a liquid inlet pipe (41) and a liquid outlet pipe (43). The liquid inlet pipe (41) is provided with an inlet valve (42), and the liquid outlet pipe (43) is provided with a one-way valve (44).

8. The energy-saving and pressure-reducing conveying device for a beam pumping unit according to claim 7 is characterized in that: The control box (6) is provided with a control system for controlling the operation of the device, and the control ends of the inlet valve (42), the electric valve (45) and the pressure sensor (53) are all electrically connected to the control system.

Images