Rotary power output device and rodless oil extraction system

Abstract

The invention provides a rotary power output device and a rodless oil extraction system. The rotary power output device comprises a lubricating oil tank, a speed reducer and a driving motor which are sequentially arranged from top to bottom. The lubricating oil tank comprises a tank body and a lubricating oil protection pipe, a top shaft hole is formed in the top of the tank body, a bottom shaft hole is formed in the bottom of the tank body, a lubricating oil storage chamber is arranged in the tank body, the lubricating oil protection pipe is communicated with the bottom shaft hole, and the top of the lubricating oil protection pipe extends towards the top of the tank body. The bottom is higher than the bottom of the box body; an output shaft of the speed reducer sequentially penetrates through the lubricating oil protection pipe and the top shaft hole and is used for being connected with an oil pumping device, and reduction gear lubricating oil of the speed reducer is communicated with the lubricating oil storage chamber through the lubricating oil protection pipe; and a motor output shaft of the driving motor is in transmission connection with an input shaft of the speed reducer. The problem that an existing rodless pump oil extraction device is short in service life due to water inflow is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil production, and particularly relates to a rotary power output device and a rodless oil production system. Background Art

[0002] The process of underground oil extraction can be mainly divided into two stages. In the first extraction stage, the energy of the underground oil reservoir is utilized to extract oil, and the oil can gush to the ground by itself, which is called primary oil production. In the second extraction stage, the energy of machinery is used to extract oil. Under the action of mechanical energy, the oil is lifted from underground to the ground, which is called secondary oil production. There are various types of mechanical equipment commonly used in secondary oil production, which can be applied to different underground oil extraction environments. For example, the commonly used secondary oil production equipment is divided into rod pump oil production devices and rodless pump oil production devices.

[0003] Among them, the commonly used rod pump oil production devices include pumping units and screw pumps.

[0004] A pumping unit converts the rotary motion of an electric motor into the reciprocating motion of a donkey head through a crank connecting rod mechanism. The sucker rod transmits the reciprocating motion of the donkey head to the oil pump, driving the piston of the oil pump to reciprocate in the pump barrel. The oil pump completes one suction of well fluid when the piston reciprocates once. When the formation fluid supply is sufficient and the working condition of the oil pump is good, the efficiency of the oil pump is relatively high. However, since it is a rod pumping method, the pumping unit that provides power is installed on the ground. The reciprocating motion of the pumping unit must be transmitted to the oil pump through the sucker rod. On the one hand, the pumping unit does work on the liquid column above the piston, as well as on the sucker rod and the balance weight. At the same time, it also has to overcome the friction load and vibration load. Generally, about 80% of the electrical energy of the pumping unit motor is consumed in overcoming the mechanical itself and various friction and vibration loads, which belongs to useless work. Only about 20% of the electrical energy is used to lift the liquid column. This will result in a relatively low electrical energy utilization rate. At the same time, due to material limitations, the oil pump cannot be lowered too deep into the wellbore, and the ground pumping unit cannot be made too large, which limits the application of the pumping unit in oil fields that require deep pumping. The sucker rod often breaks and disconnects during use, causing accidents.

[0005] A screw pump rotates the downhole screw pump through a sucker rod after the high-speed rotary motion of the electric motor is decelerated by a speed reduction mechanism, sucks and lifts the well fluid to the ground. Its disadvantages are that the screw pump cannot be lowered too deep into the well, the sucker rod is easily twisted off, and the torque is transmitted through the slender sucker rod, resulting in large energy loss and low electrical energy utilization rate, etc.

[0006] Among them, the common rodless pumping units include electric pumps, jet pumps, and hydraulic piston pumps. An electric pump transmits electrical energy to a downhole motor through a cable. The downhole motor rotates to drive a centrifugal pump to rotate. The electric pump unit has no redundant auxiliary equipment. The motor directly transmits kinetic energy to the centrifugal pump, and the centrifugal pump directly does work on the well fluid, thereby lifting the well fluid to the ground. However, after the downhole motor has been producing oil from the oil layer for a long time, the water-containing oil stain in the oil layer may enter the downhole motor and the centrifugal pump, resulting in rusting of the internal parts of the downhole motor and the centrifugal pump, and a poor service life. Moreover, the characteristics of the centrifugal pump's own characteristic curve cause a low pump efficiency under high lift and high displacement conditions, which is not conducive to the efficient utilization of electrical energy.

[0007] A jet pump is a ground device that pressurizes the power fluid on the ground and transports it to a downhole nozzle through a dedicated power fluid pipeline. The nozzle converts the pressure energy into kinetic energy, forming a low-pressure area behind the nozzle. The formation produced fluid flows in and mixes with the power fluid, and the kinetic energy is converted into pressure energy through a diffuser pipe, thereby lifting the mixed fluid to the ground. Its characteristics are few moving parts and a compact structure, but it is not suitable for deep well oil production and has low efficiency.

[0008] A hydraulic piston pump is a ground device that pressurizes the power fluid and transports the power fluid to a downhole hydraulic motor through a tubing or a dedicated power fluid pipeline. The power fluid drives the hydraulic motor to lift the crude oil to the ground. The characteristics of the hydraulic piston pump are that the unit structure is complex, the processing accuracy requirements are high, the ground supporting system is large, and the investment benefit is low. Summary of the Invention

[0009] In order to solve the problems existing in the prior art, the present invention provides a rotary power output device and a rodless oil production system, which solve the problem that after the rodless pumping unit has been producing oil from the oil layer for a long time, the water-containing oil stain in the oil layer enters the rodless pumping unit, resulting in rusting of the internal parts of the rodless pumping unit and a poor service life of the rodless pumping unit.

[0010] To achieve the above object, the present invention provides the following technical solution: A rotary power output device for a rodless oil production system, comprising:

[0011] A lubricating oil tank, a reducer, and a driving motor arranged in sequence from top to bottom;

[0012] The lubricating oil tank includes a box body and a lubricating oil protection pipe. The top of the box body is provided with a top shaft hole, the bottom of the box body is provided with a bottom shaft hole, the box body internally has a lubricating oil storage chamber, the lubricating oil protection pipe is communicated with the bottom shaft hole, and the top of the lubricating oil protection pipe extends towards the top of the box body and is higher than the bottom of the box body;

[0013] The output shaft of the speed reducer sequentially passes through the lubricating oil protection pipe and the top shaft hole for connection with the oil pumping device, and the lubricating oil of the reduction gear of the speed reducer is communicated with the lubricating oil storage chamber through the lubricating oil protection pipe;

[0014] The motor output shaft of the drive motor is in transmission connection with the input shaft of the speed reducer.

[0015] Further, the box body includes a housing, a partition plate, a connecting pipe, a top plate and a bottom plate; the top plate covers the top opening of the housing, the bottom plate covers the bottom opening of the housing, the partition plate is arranged between the top plate and the bottom plate, and a sealing shaft hole for passing through the output shaft of the speed reducer is formed on the partition plate. The top shaft hole is formed on the top plate, and the bottom shaft hole is formed on the bottom plate. The lubricating oil storage chamber includes: a first oil storage chamber formed between the top plate and the partition plate, and a second oil storage chamber formed between the bottom plate and the partition plate; the connecting pipe vertically penetrates through the partition plate to communicate the first oil storage chamber and the second oil storage chamber, and the first end of the connecting pipe is higher than the partition plate by a first preset height distance.

[0016] Further, the second end of the connecting pipe is lower than the partition plate by a second preset height distance, the top of the lubricating oil protection pipe is lower than the partition plate by a third preset height distance, and the third preset height distance is less than the second preset height distance.

[0017] Further, it also includes a drainage pipe arranged in the first oil storage chamber and sleeved on the output shaft of the speed reducer. The first end of the drainage pipe is communicated with the top shaft hole, and the second end of the drainage pipe extends towards the partition plate and is higher than the partition plate by a fourth preset height distance, and the fourth preset height distance is less than the first preset height distance.

[0018] Further, the cylinder body at the bottom of the lubricating oil tank is flange-sealedly connected to the cylinder body at the top of the speed reducer, and the cylinder body at the bottom of the speed reducer is flange-sealedly connected to the cylinder body at the top of the drive motor.

[0019] Further, the output shaft of the speed reducer includes a first output shaft led out from the cylinder body of the speed reducer and a second output shaft connected to the first output shaft by a spline. The second output shaft sequentially passes through the lubricating oil protection pipe and the top shaft hole.

[0020] Further, the drive motor includes a motor bearing end cover, a motor stator, a motor rotor, and a motor output shaft. The first end of the motor rotor is rotatably connected to the shaft hole at the bottom end of the motor stator, and the second end of the motor rotor is rotatably connected to the shaft hole at the top end of the motor stator. The motor bearing end cover is hermetically sealed to the shaft hole at the bottom end of the motor stator. The motor output shaft is arranged at the second end of the motor rotor. A spline sleeve is provided on the input shaft of the reducer, and a spline is provided on the motor output shaft. The spline of the motor output shaft is inserted into the spline sleeve of the input shaft of the reducer.

[0021] Further, the reducer is a speed increasing and torque increasing device adopting a planetary gear structure.

[0022] The present invention also provides a rodless oil production system, including:

[0023] A plunger pump, in which a plunger slides in a cylinder block and can reciprocate. One end of the plunger forms a sealed working cavity with the top of the cylinder block. A liquid outlet check valve port and a liquid inlet check valve port are arranged on the upper part of the cylinder block. The inlet of the liquid outlet check valve port is communicated with the sealed working cavity, and the outlet is communicated with the above-ground oil outlet pipeline. The inlet of the liquid inlet check valve port is communicated with the oil layer, and the outlet is communicated with the sealed working cavity. The other end of the plunger is in threaded transmission connection with the rotational power output end of a threaded drive rod.

[0024] For the above rotational power output device, the rotational power input end of the threaded drive rod extends out of the cylinder block and is connected to the rotational power output end of the rotational power output device.

[0025] A control device, which is electrically connected to the rotational power output device and is used to send an oil production instruction to the rotational power output device to control the forward and reverse rotation of the threaded drive rod.

[0026] Further, the oil production instructions issued by the control device include: 1) a first drive signal for controlling the rotational power output end of the rotational power output device to output rotational power in a first rotational direction; 2) a second drive signal for controlling the rotational power output end of the rotational power output device to output rotational power in a second rotational direction; 3) a number of turns adjustment signal for adjusting the number of turns of the rotational power output end of the rotational power output device; 4) a rotational speed adjustment signal for adjusting the rotational speed of the rotational power output end of the rotational power output device.

[0027] Among them, the first drive signal controls the forward rotation of the rotational power output end of the rotational power output device, and the second drive signal controls the reverse rotation of the rotational power output end of the rotational power output device.

[0028] Compared with the prior art, the present invention has at least the following beneficial effects:

[0029] The present invention provides a rotary power output device, which arranges a lubricating oil tank, a speed reducer and a driving motor in sequence from top to bottom, and a lubricating oil protection pipe is arranged in the lubricating oil tank. After the water-containing oil stain flows into the lubricating oil tank, the water with a density greater than that of the lubricating oil will sink to the bottom of the lubricating oil tank, while the lubricating oil with a smaller density will flow into the speed reducer through the top of the lubricating oil protection pipe higher than the bottom of the box body, which can prevent the water sinking to the bottom of the lubricating oil tank from entering the speed reducer and improve its service life.

[0030] Furthermore, the present invention also arranges a partition in the box body of the lubricating oil tank to divide the lubricating oil storage chamber into a first oil storage chamber and a second oil storage chamber. The first oil storage chamber and the second oil storage chamber are communicated through a communicating pipe, and both ends of the communicating pipe extend a certain distance in a direction away from the partition, which can further prevent the water-containing oil stain from entering the lubricating oil protection pipe and then entering the speed reducer. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered as a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components.

[0032] Figure 1 is a schematic structural diagram of a rodless oil production system provided by an embodiment of the present invention;

[0033] Figure 2 is Figure 1 an enlarged view of the structure of A in

[0034] In the drawings: 100 plunger pump, 1011 pump head, 1012 first pump barrel, 1013 second pump barrel; 102 plunger; 103 threaded drive rod; 104 inlet check valve port, 104a first mating valve groove, 104b second mating valve groove, 104c valve core, 104d elastic member, 104e oil groove; 105 outlet check valve port; 106 guiding mechanism; 107 sealing packing; 108 packing gland; 109 thrust bearing; 110 fixing nut;

[0035] 200 rotary power output device; 210 lubricating oil tank, 211 box body, 212 lubricating oil protection pipe, 2112 partition, 2111 communicating pipe; 220 speed reducer; 221 upper gear set, 222 upper support plate, 223 lower gear set, lower support plate 224, 225 large cover gear, 226 planetary gear set, 227 planetary gear bracket, 228 output shaft of the speed reducer, 229 input shaft of the speed reducer; 230 driving motor, 231 motor bearing end cover, 232 motor stator, 233 motor rotor, 234 motor output shaft. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] To further elaborate on the technical means and effects adopted by the present invention to achieve the objectives of the intended invention embodiments, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation manners, structures, features, and effects of the rodless oil production system and its plunger pump proposed according to the embodiments of the present invention. In the following description, different "an embodiment" or "embodiments" do not necessarily refer to the same embodiment. In addition, the specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0037] Figures 1 to 2 Please refer to an embodiment of the rodless oil production system provided by the present invention. Figures 1 to 2 A rodless oil production system proposed in an embodiment of the present invention includes:

[0038] A plunger pump 100, including a cylinder block 101, a plunger 102, a threaded drive rod 103, an inlet check valve port 104, and an outlet check valve port 105. The plunger 102 can reciprocate within the cylinder block 101. One end of the plunger 102 in the first direction of reciprocating movement forms a sealed working cavity with the inner wall of the cylinder block 101. A guiding mechanism 106 parallel to the linear trajectory of the reciprocating movement of the plunger 102 is formed within the cylinder block 101. The plunger 102 is slidably connected to the guiding mechanism 106. The rotational power output end of the threaded drive rod 103 is in threaded driving connection with one end of the plunger 102 in the second direction of reciprocating movement. The inlet check valve port 104 and the outlet check valve port 105 are respectively communicated with the sealed working cavity.

[0039] A rotational power output device 200, whose rotational power output end is in driving connection with the rotational power input end of the threaded drive rod 103.

[0040] The plunger pump 100 and the rotational power output device 200 of the rodless oil production system are placed in the oil production well from top to bottom, facilitating the connection of the inlet check valve port 104 to the oil layer under the oil production well and the connection of the outlet check valve port 105 to the above-ground oil outlet pipeline of the oil production well.

[0041] Preferably, it further includes a control device. The control device is electrically connected to the drive motor 230 of the rotational power output device 200 and is used to send an oil production instruction to the drive motor 230, so that the drive motor 230 cyclically outputs rotational power in the first rotational direction and rotational power in the second rotational direction according to the oil production instruction. The first rotational direction is opposite to the second rotational direction. The control device can be arranged on the ground to send an oil production instruction to the drive motor 230 underground.

[0042] Preferably, the whole of the rodless oil production system can be cylindrical, and its outer diameter is smaller than the inner diameter of the oil well.

[0043] Preferably, the guiding mechanism 106 and the cylinder block 101 can be an integral structure or a split structure.

[0044] Preferably, the cylinder block 101 itself can be an integral structure or a split structure;

[0045] In some integral structures, for the convenience of production, the cylinder block 101 includes a pump head 1011 and a pump barrel, and the pump head 1011 covers the first end opening of the pump barrel;

[0046] In some split embodiments, the cylinder block 101 includes a pump head 1011, a first pump barrel 1012, and a second pump barrel 1013. The pump head 1011 covers the first end opening of the first pump barrel 1012, and the opening of the second end of the first pump barrel 1012 is hermetically connected to the opening of the first end of the second pump barrel 1013; the guiding mechanism 106 is a slide rail arranged on the inner wall of the second pump barrel 1013, and the top of the plunger 102 can reciprocate in the first pump barrel 1011, and the sliding body at the bottom of the plunger 102 is slidably connected to the slide rail.

[0047] Preferably, the slide rail is a chute of a straight rod, and the sliding body at the bottom of the plunger 102 is a slider slidably connected to the chute. Or, the slide rail is a slide rod of a straight rod, and the sliding body at the bottom of the plunger 102 is a chute slidably connected to the slide rod.

[0048] Preferably, the number of slide rails is not limited to one, and can be multiple groups of slide rails arranged oppositely on the inner wall of the second pump barrel 1013.

[0049] Preferably, in the realization of the hermetic connection between the opening of the second end of the first pump barrel 1012 and the opening of the first end of the second pump barrel 1013, an outer ring groove opened outside the opening of the second end of the first pump barrel 1012 is clamped with an outer ring platform opened outside the opening of the first end of the second pump barrel 1013. A sealing inner ring groove is opened inside the opening of the second end of the first pump barrel 1012, the bottom of the sealing inner ring groove is filled with a sealing filler 107, the side of the sealing inner ring groove is slidably connected to the side wall of the plunger 102, and the top of the sealing inner ring groove is fastened by a packing gland 108.

[0050] Preferably, the threaded drive rod 103 passes through a shaft hole provided at the second end of the second pump barrel 1013. At both ends of the shaft hole at the second end of the second pump barrel 1013, a thrust bearing 109 and a fixing nut 110 are respectively provided, and the thrust bearing 109 and the fixing nut 110 are sleeved on the threaded drive rod 103.

[0051] Preferably, the rotational power output end of the threaded drive rod 103 and the thread on one side of the second direction of the reciprocating movement of the plunger 102 can be connected by spline transmission. Driven by the rotational power of the rotational power output end of the threaded drive rod 103, due to the guiding of the plunger 102 by the guiding mechanism 106, the plunger 102 can move on a straight track reciprocating in the cylinder block 101.

[0052] In implementation, in the first implementation mode, the rotation power output end of the threaded drive rod 103 is an external threaded rod, and one side in the second direction of the reciprocating movement of the plunger 102 has an internal threaded hole, and the external threaded rod is in threaded transmission connection with the internal threaded hole. The axis of the internal threaded hole and the axis of the external threaded rod are respectively coaxial with the axis of the cylinder block 101.

[0053] In the second implementation mode, the rotation power output end of the threaded drive rod 103 is an internal threaded hole, and one side in the second direction of the reciprocating movement of the plunger has an external threaded rod, and the internal threaded hole is in threaded transmission connection with the external threaded rod. The axis of the internal threaded hole and the axis of the external threaded rod are respectively coaxial with the axis of the cylinder block 101.

[0054] Preferably, the opening positions of the liquid inlet one-way valve port 104 and the liquid outlet one-way valve port 105 are selected according to needs. Optionally, the liquid inlet one-way valve port 104 is opened on the side of the cylinder block 101; the liquid outlet one-way valve port 105 is opened at the top of the cylinder block 101, or the liquid inlet one-way valve port 104 is opened at the top of the cylinder block 101, and the liquid outlet one-way valve port 105 is opened on the side wall of the cylinder block 101.

[0055] Preferably, the number of the liquid inlet one-way valve ports 104 is not limited to one, and its opening positions and quantity are determined according to the oil layer. Usually, the oil layer is located around the cylinder block 101, and there can be multiple liquid inlet one-way valve ports 104. The multiple liquid inlet one-way valve ports 104 are circumferentially arranged on the side of the cylinder block 101 to simultaneously suck oil from the oil layers around the cylinder block 101.

[0056] Preferably, the liquid inlet one-way valve port 104 includes: a liquid inlet valve seat, a liquid inlet valve core, and a liquid inlet elastic device. The liquid inlet one-way valve port can be a separate valve component and installed on the cylinder block, or the liquid inlet valve seat is opened on the cylinder block.

[0057] Preferably, the liquid outlet one-way valve port 105 includes: a liquid outlet valve seat, a liquid outlet valve core, and a liquid outlet elastic device. The liquid outlet one-way valve port 105 can be a separate valve component and installed on the cylinder block 101, or the liquid outlet valve seat is opened on the cylinder block 101. The number of the liquid outlet valve cores is not limited to one. For example, the liquid outlet valve seat is a stepped drain hole with an increasing hole diameter in the liquid outlet direction. The liquid outlet valve core includes a larger spherical valve core and a smaller spherical valve core. The smaller spherical valve core is installed in the small-diameter installation hole of the stepped drain hole, and the larger spherical valve core is installed in the large-diameter installation hole of the stepped drain hole. The shape of the liquid outlet valve core is not limited to spherical, and it can also be a valve core of other shapes. Its function is to ensure the one-way flow of the liquid. Valve covers of different sizes are installed in the large-diameter installation hole and the small-diameter installation hole.

[0058] The rotary power output device 200 includes: a lubricating oil tank 210, a speed reducer 220, and a driving motor 230, which are arranged in sequence from top to bottom; the output shaft of the speed reducer 220 passes through the bottom shaft hole opened at the bottom of the lubricating oil tank 210 and the top shaft hole opened at the top of the lubricating oil 210 tank and is in transmission connection with the rotary power input end of the threaded drive rod 103. The shaft hole at the top of the speed reducer 220 communicates with the lubricating oil storage chamber of the lubricating oil tank 210; the motor output shaft of the driving motor 230 is in transmission connection with the input shaft of the speed reducer 220. The lubricating oil in the lubricating oil tank 210 flows into the speed reducer 220 under the action of gravity to lubricate the reduction gears in the speed reducer 220. Specifically, the shaft hole at the bottom of the speed reducer 220 communicates with the shaft hole of the driving motor 230, so that the lubricating oil tank 210 lubricates the output shaft of the driving motor 230 at the same time.

[0059] In some sealing solutions, the cylinder body at the bottom of the cylinder block 101 is flange-sealed to the cylinder body at the top of the lubricating oil tank 210, the cylinder body at the bottom of the lubricating oil tank 210 is flange-sealed to the cylinder body at the top of the speed reducer 220, and the cylinder body at the bottom of the speed reducer 220 is flange-sealed to the cylinder body at the top of the driving motor 230. The axis of the cylinder body of the cylinder block 101, the axis of the cylinder body of the lubricating oil tank 210, and the axis of the cylinder body of the speed reducer 220 are respectively coaxial with the axis of the output shaft of the speed reducer 230.

[0060] Preferably, the motor output shaft of the driving motor 230 and the input shaft of the speed reducer 220 can be in spline transmission connection. For example, the driving motor 230 includes a motor bearing end cover 231, a motor stator 232, a motor rotor 233, and a motor output shaft 234. The first end of the motor rotor 233 is rotatably connected to the shaft hole at the bottom end of the motor stator 232, the second end of the motor rotor 233 is rotatably connected to the shaft hole at the top end of the motor stator 233, the motor bearing end cover 231 is sealed to the shaft hole at the bottom end of the motor stator 233, and the motor output shaft 234 is arranged at the second end of the motor rotor 233. A spline sleeve is provided on the input shaft of the speed reducer 220, and a spline is provided on the motor output shaft 234. The spline of the motor output shaft 234 is inserted into the spline sleeve of the input shaft of the speed reducer 22.

[0061] Preferably, the driving motor 230 can be an ordinary high-torque motor.

[0062] Preferably, the speed reducer 220 can adopt a planetary gear structure. For example, the speed reducer is a speed increasing and torque reducing device, which includes: a speed increasing and torque reducing housing, an upper gear set 221, an upper support plate 222, a lower gear set 223, a lower support plate 224, a large cover gear 225, a planetary gear set 226, a planetary gear bracket 227, an output shaft 228 of the speed reducer, and an input shaft 229 of the speed reducer. The upper support plate 222, the lower support plate 224, and the planetary gear bracket 227 are stacked from top to bottom in the speed increasing and torque reducing housing. The upper gear set 221 is arranged between the top plate of the speed increasing and torque reducing housing and the upper support plate 222. The lower gear set 223 is placed between the upper support plate 222 and the lower support plate 224. The large cover gear 225 and the planetary gear set 226 are arranged between the lower support plate 224 and the planetary gear bracket 227.

[0063] The input shaft 229 of the speed reducer is arranged in the shaft hole of the bottom plate of the speed increasing and torque reducing housing and is in transmission connection with the first transmission end of the planetary gear set 226. The second transmission end of the planetary gear set 226 is in transmission connection with the first transmission end of the large cover gear 225. The second transmission end of the large cover gear 225 is in transmission connection with the first transmission end of the lower gear set 223. The second transmission end of the lower gear set 223 is in transmission connection with the first transmission end of the upper gear set 221. The second transmission end of the upper gear set 221 is in transmission connection with the output shaft 228 of the speed reducer. The output shaft 228 of the speed reducer is arranged in the shaft hole of the top plate of the speed increasing and torque reducing housing.

[0064] In the technical solution provided by the embodiment of the present invention, the rodless oil production system is placed under the oil production well, so that the inlet check valve port 104 communicates with the oil layer under the oil production well, and the outlet check valve port 105 communicates with the above-ground oil outlet pipeline of the oil production well. The ground control device transmits electric energy to the downhole rotary power output device 200. The rotary power output by the rotary power output device 200 drives the threaded drive rod 103 to rotate forward and backward. Under the threaded transmission of the rotary power output end of the threaded drive rod 103 and the plunger 102, the plunger 102 reciprocates in the cylinder block 101, so that the volume of the sealed working cavity changes to realize oil suction and oil pressure. Compared with the prior art, the high-efficiency characteristics of the plunger pump are fully utilized, and the disadvantage of doing work on the oil production rod during the working process of the oil production machine is abandoned. Among them, in the technical solution provided by the embodiment of the present invention, the rotary power output device 200 efficiently converts electric energy into mechanical energy, and the mechanical energy is efficiently converted into formation fluid pressure and the oil is lifted to the ground, with lower energy consumption.

[0065] Please refer to Figures 1 to 2 , the rotary power output device 200 of the rodless oil production system proposed by an embodiment of the present invention includes: a lubricating oil tank 210, a speed reducer 220, and a driving motor 230 arranged in sequence from top to bottom;

[0066] The lubricating oil tank 210 includes a tank body 211 and a lubricating oil protection pipe 212. A top shaft hole is provided at the top of the tank body 211, and a bottom shaft hole is provided at the bottom of the tank body 211. A lubricating oil storage chamber is provided inside the tank body 211. The lubricating oil protection pipe 212 is communicated with the bottom shaft hole, and the top of the lubricating oil protection pipe 212 extends towards the top of the tank body 211 and is higher than the bottom of the tank body 211.

[0067] The output shaft of the speed reducer 220 sequentially passes through the lubricating oil protection pipe 212 and the top shaft hole, and the reduction gear lubricating oil of the speed reducer 220 is communicated with the lubricating oil storage chamber through the lubricating oil protection pipe 212.

[0068] The motor output shaft of the driving motor 230 is in transmission connection with the input shaft of the speed reducer 220.

[0069] After the rodless oil production system is vertically arranged in the oil well, the lubricating oil tank 210, the speed reducer 220, and the driving motor 230 are arranged in sequence from top to bottom. After the rodless oil production system has been producing oil from the oil layer for a long time, the water-containing oil stain in the oil layer may flow downward into the interior of the lubricating oil tank 210 through the cylinder block and cause rusting of the gears inside the speed reducer, resulting in a poor service life. In the technical solution provided by the embodiment of the present invention, after the water-containing oil stain flows into the lubricating oil tank, the water with a density greater than that of the lubricating oil will sink to the bottom of the lubricating oil tank, while the lubricating oil with a smaller density will flow into the speed reducer through the top of the lubricating oil protection pipe that is higher than the bottom of the tank body, which can prevent the water sinking to the bottom of the lubricating oil tank from entering the speed reducer and improve its service life.

[0070] In practice, the water-containing oil stain may directly enter the top of the lubricating oil protection pipe 212 during the falling process. Further, in some embodiments provided by the present invention, the tank body 211 includes an outer shell, a partition plate 2112, a communication pipe 2111, a top plate, and a bottom plate; the top plate seals the top opening of the outer shell, the bottom plate seals the bottom opening of the outer shell, the partition plate 2112 is arranged between the top plate and the bottom plate, and a sealing shaft hole for passing through the output shaft of the speed reducer 220 is provided on the partition plate 2112. The top shaft hole is provided on the top plate, and the bottom shaft hole is provided on the bottom plate; the lubricating oil storage chamber includes: a first oil storage chamber formed between the top plate and the partition plate 2112, and a second oil storage chamber formed between the bottom plate and the partition plate 2112; the communication pipe 2111 vertically penetrates the partition plate 2112 to communicate the first oil storage chamber and the second oil storage chamber, and the first end of the communication pipe 2111 is higher than the partition plate 2112 by a first preset height distance. The water-containing oil stain can fall to the bottom of the first oil storage chamber, and the lubricating oil in the first oil storage chamber can enter the second oil storage chamber through the first end of the communication pipe 2111.

[0071] Further, the second end of the connecting pipe 2111 is lower than the second preset height distance from the partition plate 2112, so that the water-containing oil sludge entering the second oil storage chamber from the second end of the connecting pipe 2111, the water therein sinks to the bottom of the second oil storage chamber from a position lower than the second preset height distance from the partition plate 2112, reducing the possibility of falling into the lubricating oil protection pipe.

[0072] Specifically, the top of the lubricating oil protection pipe 212 is lower than the third preset height distance from the partition plate 2112, and the third preset height distance is less than the second preset height distance, further reducing the possibility of falling into the lubricating oil protection pipe.

[0073] In addition, it may further include: a drainage pipe (not shown in the figure) provided in the first oil storage chamber, sleeved on the output shaft of the speed reducer, the first end of the drainage pipe is communicated with the top shaft hole, and the second end of the drainage pipe extends towards the partition plate 2112, higher than the fourth preset height distance from the partition plate 2112, and the fourth preset height distance is less than the first preset height distance, which can reduce the moisture entering the second oil storage chamber from the first oil storage chamber.

[0074] Preferably, the cylinder body at the bottom of the lubricating oil tank 210 is flange-sealedly connected to the cylinder body at the top of the speed reducer 220, and the cylinder body at the bottom of the speed reducer 220 is flange-sealedly connected to the cylinder body at the top of the drive motor 230, so as to seal the outer cylinder wall of the overall rotating power output device 200.

[0075] Preferably, the output shaft of the speed reducer 220 includes a first output shaft led out from the cylinder body of the speed reducer 220 and a second output shaft connected to the first output shaft by splines. The second output shaft sequentially passes through the lubricating oil protection pipe 212 and the top shaft hole. The second output shaft serves as the output shaft of the rotating power output device 200.

[0076] The oil extraction method of the rodless oil extraction system proposed by an embodiment of the present invention is as follows:

[0077] Place the rodless oil extraction system under the oil well, connect the inlet check valve port 104 to the oil layer under the oil well, connect the outlet check valve port 105 to the above-ground oil outlet pipeline of the oil well, and send an oil extraction instruction to the rotating power output device 200;

[0078] The rotating power output device 200 cyclically outputs the rotating power in the first rotation direction and the rotating power in the second rotation direction according to the oil extraction instruction. The first rotation direction is opposite to the second rotation direction, so that the oil in the oil layer is sucked into the sealed working cavity by the plunger moving in the second direction through the inlet check valve port 104, and the oil in the sealed working cavity is pushed into the above-ground oil outlet pipeline by the plunger 102 moving in the first direction through the outlet check valve port 105.

[0079] Furthermore, in the technical solution provided by the embodiment of the present invention, the rodless oil production system is placed downhole in the oil well, the inlet check valve port 104 communicates with the oil layer downhole in the oil well, and the outlet check valve port 105 communicates with the above-ground oil outlet pipeline of the oil well. The ground control device transmits electric energy to the downhole rotary power output device 200, and the rotary power output by the rotary power output device 200 drives the threaded drive rod 103 to rotate forward and backward. Under the threaded drive of the rotary power output end of the threaded drive rod 103 and the plunger 102, the plunger 102 reciprocates in the cylinder block, causing the volume of the sealed working chamber to change to achieve oil suction and oil pressure. Compared with the prior art, the high-efficiency characteristics of the plunger pump are fully utilized, and the disadvantage of doing work on the sucker rod during the operation of the oil production machine is abandoned. Among them, in the technical solution provided by the embodiment of the present invention, the rotary power output device efficiently converts electric energy into mechanical energy, and the mechanical energy is efficiently converted into the formation fluid pressure and the oil is lifted to the ground with lower energy consumption.

[0080] Among them, the oil production instructions include:

[0081] 1) The first drive signal and the second drive signal that the rotary power output device 200 executes cyclically. The first drive signal controls the rotary power output end of the rotary power output device 200 to output rotary power in the first rotation direction, and the second drive signal controls the rotary power output end of the rotary power output device 200 to output rotary power in the second rotation direction. The first drive signal and the second drive signal cause the rotary power output by the rotary power output device 200 to drive the threaded drive rod 103 to rotate forward and backward.

[0082] 2) The number-of-turns adjustment signal for adjusting the number of rotation turns of the power output end of the rotary power output device 200.

[0083] 3) The rotational speed adjustment signal for adjusting the rotational speed of the power output end of the rotary power output device 200.

[0084] By setting parameters to control the rotational speed, forward and reverse rotation, and number of revolutions of the drive motor 230 of the rotary power output device 200, the reciprocating linear motion of the plunger 102 in the cylinder block, as well as the stroke and motion frequency of the plunger 102, are realized. The stroke adjustment of the plunger 102 is achieved by controlling the rotational speed.

[0085] The rodless oil production system is placed downhole in the oil well, so that the inlet check valve port 104 communicates with the oil layer downhole in the oil well, and the outlet check valve port 105 communicates with the above-ground oil outlet pipeline of the oil well. Specifically, it includes:

[0086] The plunger pump 100 and the rotary power output device 200 are arranged vertically downhole in the oil well, so that the inlet check valve port 104 on the side wall of the cylinder block 101 communicates with the oil layer downhole in the oil well, and the outlet check valve port 105 at the top of the cylinder block communicates with the above-ground oil outlet pipeline of the oil well.

[0087] In the above embodiments, the descriptions of the various embodiments each have their own emphasis. For parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0088] It can be understood that the relevant features in the above devices can be referred to each other. In addition, the "first", "second", etc. in the above embodiments are used to distinguish the various embodiments, and do not represent the advantages or disadvantages of the various embodiments.

[0089] In the specification provided herein, a large number of specific details are set forth. However, it can be understood that the embodiments of the present invention can be practiced without these specific details. In some instances, well-known structures and techniques are not shown in detail so as not to obscure the understanding of this specification.

[0090] Similarly, it should be understood that, in order to streamline the present disclosure and assist in understanding one or more of the various inventive aspects, in the foregoing description of the exemplary embodiments of the present invention, the various features of the present invention are sometimes grouped together in a single embodiment, figure, or description thereof. However, the disclosed apparatus should not be construed as reflecting the intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as reflected in the following claims, the inventive aspects lie in less than all the features of the single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of the present invention.

[0091] Those skilled in the art can understand that the components in the devices of the embodiments can be adaptively changed and disposed in one or more devices different from the embodiments. The components in the embodiments can be combined into one component, and in addition, they can be divided into multiple sub-components. Except that at least some of such features are mutually exclusive, any combination can be used to combine all the features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all the components of any device so disclosed. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) can be replaced by an alternative feature providing the same, equivalent, or similar purpose.

[0092] In addition, those skilled in the art can understand that although some of the embodiments herein include certain features included in other embodiments rather than other features, the combination of the features of different embodiments means that it is within the scope of the present invention and forms different embodiments. For example, in the following claims, any one of the claimed embodiments can be used in any combination. The various component embodiments of the present invention can be implemented in hardware or in combinations thereof.

[0093] It should be noted that the above embodiments illustrate the present invention rather than limit the present invention, and those skilled in the art can design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or components not listed in a claim. The word "a" or "an" preceding an element or component does not exclude the presence of a plurality of such elements or components. The present invention can be implemented by means of a device including several different elements. In a claim listing several elements, several of these elements may be embodied by the same item of element. The use of the words first, second, and third, etc. does not denote any order. These words can be interpreted as names.

[0094] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A rotary power output device for a rodless oil production system, characterized in that Including: A lubricating oil tank (210), a speed reducer (220), and a driving motor (230) arranged in sequence from top to bottom; The lubricating oil tank includes a box body (211) and a lubricating oil protection pipe (212). A top shaft hole is opened at the top of the box body (211), and a bottom shaft hole is opened at the bottom of the box body (211). A lubricating oil storage chamber is provided inside the box body (211). The lubricating oil protection pipe (212) is communicated with the bottom shaft hole, and the top of the lubricating oil protection pipe (212) extends towards the top of the box body (211) and is higher than the bottom of the box body (211); The output shaft of the speed reducer (220) sequentially passes through the lubricating oil protection pipe (212) and the top shaft hole for connection with an oil pumping device. The lubricating oil of the reduction gear of the speed reducer (220) is communicated with the lubricating oil storage chamber through the lubricating oil protection pipe (212); The motor output shaft of the driving motor (230) is in transmission connection with the input shaft of the speed reducer (220).

2. The rotary power output device of a rodless oil production system according to claim 1, characterized in that, The box body includes a shell, a partition plate (2111), a connecting pipe (2112), a top plate, and a bottom plate; the top plate covers the top opening of the shell, the bottom plate covers the bottom opening of the shell, the partition plate (2111) is arranged between the top plate and the bottom plate, and a sealing shaft hole for passing through the output shaft of the speed reducer is opened on the partition plate (2111). The top shaft hole is opened on the top plate, and the bottom shaft hole is opened on the bottom plate. The lubricating oil storage chamber includes: a first oil storage chamber formed between the top plate and the partition plate (2111), and a second oil storage chamber formed between the bottom plate and the partition plate (2111); the connecting pipe (2112) vertically penetrates the partition plate (2111) to communicate the first oil storage chamber and the second oil storage chamber, and the first end of the connecting pipe (2112) is higher than the partition plate (2111) by a first preset height distance.

3. The rotational power output device of a rodless oil production system according to claim 2, characterized in that, The second end of the connecting pipe (2112) is lower than the partition plate (2111) by a second preset height distance, and the top of the lubricating oil protection pipe (212) is lower than the partition plate (2111) by a third preset height distance, and the third preset height distance is less than the second preset height distance.

4. The rotary power output device of a rodless oil production system according to claim 2, characterized in that, It also includes a drainage pipe arranged in the first oil storage chamber and sleeved on the output shaft of the speed reducer. The first end of the drainage pipe is communicated with the top shaft hole, and the second end of the drainage pipe extends towards the partition plate (2111) and is higher than the partition plate (2111) by a fourth preset height distance, and the fourth preset height distance is less than the first preset height distance.

5. The rotary power output device of a rodless oil production system according to claim 1, characterized in that, The cylinder body at the bottom of the lubricating oil tank (210) is flange-sealedly connected to the cylinder body at the top of the speed reducer (220), and the cylinder body at the bottom of the speed reducer (220) is flange-sealedly connected to the cylinder body at the top of the driving motor (230).

6. The rotary power output device of a rodless oil production system according to claim 1, characterized in that The output shaft of the speed reducer (220) includes a first output shaft extending from the cylinder body of the speed reducer and a second output shaft splined to the first output shaft. The second output shaft sequentially passes through the lubricating oil protection pipe (212) and the top shaft hole.

7. The rotary power output device of a rodless oil production system according to claim 1, characterized in that The drive motor (230) includes a motor bearing end cover (231), a motor stator (232), a motor rotor (233), and a motor output shaft (234). The first end of the motor rotor (233) is rotatably connected to the shaft hole at the bottom end of the motor stator (232), and the second end of the motor rotor (233) is rotatably connected to the shaft hole at the top end of the motor stator (233). The motor bearing end cover (231) seals the shaft hole at the bottom end of the motor stator (233). The motor output shaft (234) is disposed at the second end of the motor rotor (233). A spline sleeve is provided on the input shaft of the speed reducer (220), and a spline is provided on the motor output shaft (234). The spline of the motor output shaft (234) is inserted into the spline sleeve of the input shaft of the speed reducer (22).

8. The rotary power output device of a rodless oil production system according to claim 1, characterized in that, The speed reducer (220) is a speed increasing and torque increasing device using a planetary gear structure.

9. A rodless oil production system, characterized in that: Comprising: A plunger pump (100), in which a plunger (102) is slidably disposed in a cylinder block (101) and can reciprocate. One end of the plunger (102) forms a sealed working cavity with the top of the cylinder block (101). A liquid outlet check valve port (105) and a liquid inlet check valve port (104) are provided in the upper part of the cylinder block (101). The inlet of the liquid outlet check valve port (105) is communicated with the sealed working cavity, and the outlet is communicated with the above-ground oil outlet pipeline. The inlet of the liquid inlet check valve port (104) is communicated with the oil layer, and the outlet is communicated with the sealed working cavity. The other end of the plunger (102) is in threaded driving connection with the rotary power output end of a threaded driving rod (103). The rotary power output device (200) according to claims 1 to 8, wherein the rotary power input end of the threaded driving rod (103) extends out of the cylinder block (101) and is connected to the rotary power output end of the rotary power output device (200). A control device, electrically connected to the rotary power output device (200) for sending an oil production instruction to the rotary power output device (200) to control the forward and reverse rotation of the threaded driving rod (103).

10. The rodless oil production system according to claim 9, wherein, The oil production instruction issued by the control device includes: 1) a first driving signal for controlling the rotary power output end of the rotary power output device (200) to output rotary power in a first rotation direction; 2) a second driving signal for controlling the rotary power output end of the rotary power output device (200) to output rotary power in a second rotation direction; 3) a number of turns adjustment signal for adjusting the number of turns of the rotary power output end of the rotary power output device (200); 4) a rotational speed adjustment signal for adjusting the rotational speed of the rotary power output end of the rotary power output device (200). Wherein the first driving signal controls the forward rotation of the rotary power output end of the rotary power output device (200), and the second driving signal controls the reverse rotation of the rotary power output end of the rotary power output device (200).

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