CN112814624A - Variable-speed energy-storage hydraulic pumping unit and method - Google Patents
Variable-speed energy-storage hydraulic pumping unit and method Download PDFInfo
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- CN112814624A CN112814624A CN201911126146.XA CN201911126146A CN112814624A CN 112814624 A CN112814624 A CN 112814624A CN 201911126146 A CN201911126146 A CN 201911126146A CN 112814624 A CN112814624 A CN 112814624A
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- 238000005086 pumping Methods 0.000 title claims abstract description 56
- 238000004146 energy storage Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 82
- 239000003129 oil well Substances 0.000 claims abstract description 50
- 238000005381 potential energy Methods 0.000 claims abstract description 8
- 239000003921 oil Substances 0.000 claims description 201
- 238000006073 displacement reaction Methods 0.000 claims description 111
- 239000010720 hydraulic oil Substances 0.000 claims description 41
- 230000008859 change Effects 0.000 claims description 19
- 230000001133 acceleration Effects 0.000 claims description 8
- 239000010779 crude oil Substances 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 5
- 239000000725 suspension Substances 0.000 abstract description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000002775 capsule Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
- E21B43/126—Adaptations of down-hole pump systems powered by drives outside the borehole, e.g. by a rotary or oscillating drive
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20546—Type of pump variable capacity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/20576—Systems with pumps with multiple pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/78—Control of multiple output members
Abstract
The invention discloses a variable-speed energy-storage hydraulic pumping unit and a method, comprising the following steps: the oil cylinder is a piston type oil cylinder, a piston is connected with a piston rod, and the lower end of the piston rod is connected with an oil well underground load; a high-pressure oil port of the bidirectional proportional variable hydraulic pump is communicated with a rod cavity of the oil cylinder through a hydraulic pipeline; the variable hydraulic motor is a plunger type high-speed variable hydraulic motor; the left end of the flywheel is coaxially connected with a variable hydraulic motor, and the right end of the flywheel is coaxially connected with a bidirectional proportional variable hydraulic pump. And the left end of the rotating speed encoder is coaxially connected with the bidirectional proportional variable hydraulic pump. The invention adopts the flywheel to store and release the potential energy of the underground sucker rod of the oil well, realizes the automatic balance of the work done by the motor in the up-down stroke of the oil pumping unit, is suitable for both high-viscosity oil wells and thin oil wells, and has the advantages of wide range of applicable oil wells, large suspension point load, long stroke, good balance effect, obvious energy saving and the like.
Description
Technical Field
The invention relates to the technical field of pumping units for sucker rod pump oil production wells in oil fields, in particular to a variable-speed energy-storage hydraulic pumping unit and a method.
Background
At present, a hydraulic pumping unit is one of pumping units for lifting the ground of a sucker rod pump well in an oil field. The pumping unit generally adopts a capsule type or piston type hydraulic accumulator filled with nitrogen to recover the potential energy of a down-hole sucker rod string and realize the work balance and equality of a motor in the up-down stroke of the pumping unit. However, the service life of the hydraulic accumulator is short due to the limitation of the material of the capsule or the piston sealing ring, and the long-service-life working requirement of the pumping unit is difficult to meet. In recent years, a flywheel has been introduced into a hydraulic pumping unit as one of long-life energy storage systems.
Chinese patent CN 104033132B discloses a flywheel balanced hydraulic pumping unit using a high slip asynchronous motor as power drive. This patent mainly comprises high slip asynchronous motor, two-way hydraulic pump, flywheel and single-action hydro-cylinder, and its theory of operation is: during the down stroke, the piston rod of the oil cylinder descends to output high-pressure hydraulic oil to the bidirectional hydraulic pump, the bidirectional hydraulic pump is driven to work under the working condition of a motor, and the bidirectional hydraulic pump and the asynchronous motor drag the flywheel to rotate in an accelerating way to realize energy storage; during the upward stroke, the flywheel rotates in a decelerating way, releases energy, and drags the bidirectional hydraulic pump working under the pump working condition together with the asynchronous motor to work, so that high-pressure hydraulic oil is output to the oil cylinder to drive the piston rod of the oil cylinder to move upwards. However, in the patent, not only the high slip asynchronous motor has low efficiency and causes the pumping unit to consume large energy, but also the pumping unit is limited by the slip rate, the flywheel energy storage capacity is limited, the lifting capacity of the pumping unit is limited, the suspension point load and the stroke are both low, and the long-stroke lifting requirement of the deep well cannot be met.
Patent CN 104141644B discloses another flywheel energy storage type hydraulic pumping unit suitable for deep well long stroke lifting requirements. This patent mainly comprises motor, proportion hydraulic pump, two-way hydraulic pump, flywheel and hydro-cylinder, and its theory of operation is: during down stroke, the proportional hydraulic pump dragged by the motor and the oil cylinder dragged by the underground sucker rod string output hydraulic oil to the bidirectional hydraulic pump at the same time, the bidirectional hydraulic pump is driven to work under the working condition of the motor, and the flywheel is dragged to rotate at an accelerated speed, so that energy storage is realized; during the upstroke, the proportional hydraulic pump dragged by the motor and the bidirectional hydraulic pump dragged by the flywheel output hydraulic oil to the oil cylinder simultaneously to drive the oil cylinder to move upwards. However, when the hydraulic pumping unit disclosed in this patent is applied to a high-viscosity crude oil well, the great downward resistance of the pumping rod makes the cylinder pressure, the output pressure of the proportional hydraulic pump and the input pressure of the bidirectional hydraulic pump extremely low during downward movement, so that the flywheel cannot perform downward energy storage and cannot perform work by the upward auxiliary motor, and therefore, the lifting requirements of a high-coagulation oil well, a high-wax oil well and a heavy oil well cannot be met.
The technical solutions of the above-disclosed technologies, the technical problems to be solved, and the advantageous effects thereof are all different from the present invention, and no technical inspiration exists in the above-disclosed technical documents for more technical features, technical problems to be solved, and advantageous effects thereof.
Disclosure of Invention
The invention aims to provide a variable-speed energy-storage hydraulic pumping unit and a method thereof, which adopt a flywheel to store and release the potential energy of an underground sucker rod of an oil well, realize the automatic balance of the work done by a motor in the upper stroke and the lower stroke of the pumping unit, are suitable for both high-viscosity oil wells and thin oil wells, and have the advantages of wide range of applicable oil wells, large suspension point load, long stroke, good balance effect, obvious energy saving and the like.
In order to achieve the above object, the present invention adopts the following technical scheme that the variable speed energy storage hydraulic pumping unit comprises:
the oil cylinder is a piston type oil cylinder, a piston is connected with a piston rod, and the lower end of the piston rod is connected with an oil well underground load;
further comprising:
a high-pressure oil port of the bidirectional proportional variable hydraulic pump is communicated with a rod cavity of the oil cylinder through a hydraulic pipeline;
the variable hydraulic motor is a plunger type high-speed variable hydraulic motor;
the left end of the flywheel is coaxially connected with a variable hydraulic motor, and the right end of the flywheel is coaxially connected with a bidirectional proportional variable hydraulic pump.
Further, still include:
and the left end of the rotating speed encoder is coaxially connected with the bidirectional proportional variable hydraulic pump.
Further, the rotating speed encoder is electrically connected with an electrical control system.
Further, still include:
the displacement sensor is a stay wire type displacement sensor or a magnetostrictive displacement sensor.
Further, the displacement sensor is electrically connected with an electrical control system.
Further, still include:
the first variable control hydraulic valve is provided with three hydraulic oil ports which are respectively a first left upper port, a first right upper port and a first lower port, the first right upper port is connected with an oil tank, and the first lower port is connected with a bidirectional proportional variable hydraulic pump.
Further, the first variable control hydraulic valve is electrically connected with an electric control system.
Further, still include:
and the second variable control hydraulic valve is provided with three hydraulic oil ports which are respectively a second left upper port, a second right upper port and a second lower port, the second right upper port is connected with the oil tank, and the second lower port is connected with the variable hydraulic motor.
Further, the second variable control hydraulic valve is electrically connected with an electric control system.
Further, still include:
the high-pressure oil port of the proportional variable hydraulic pump is connected with the high-pressure oil port of the variable hydraulic motor through a hydraulic pipeline;
the right end of the motor is coaxially connected with the proportional variable hydraulic pump;
and the left end of the control hydraulic pump is coaxially connected with the proportional variable hydraulic pump.
Further, still include:
and the third variable control hydraulic valve is provided with three hydraulic oil ports which are respectively a third left upper port, a third right upper port and a third lower port, the third right upper port is connected with the oil tank, and the third lower port is connected with the proportional variable hydraulic pump.
Further, the third variable control hydraulic valve is electrically connected with an electric control system.
Furthermore, a high-pressure oil port of the control hydraulic pump is simultaneously communicated with the first left upper port, the second left upper port and the third left upper port through pipelines.
Furthermore, an overflow valve is connected to the pipeline of the high-pressure oil port of the control hydraulic pump.
Further, still include:
and the pressure sensor is connected to a pipeline of a high-pressure oil port of the proportional variable hydraulic pump.
Further, the pressure sensor is electrically connected with an electrical control system.
In order to achieve the purpose, the invention adopts the following technical scheme that the control method of the variable-speed energy-storage hydraulic pumping unit comprises the following steps:
when the timing of the up running time of the oil cylinder is finished, the bidirectional proportional variable hydraulic pump is switched to the working condition of the motor under the control of the first variable control hydraulic valve, so that the piston rod of the oil cylinder starts to move downwards; the oil cylinder outputs high-pressure hydraulic oil under the action of the downward gravity of the underground sucker rod to drive the bidirectional proportional variable hydraulic pump to output mechanical work;
meanwhile, namely the piston rod of the oil cylinder moves downwards from beginning, the displacement of the proportional variable hydraulic pump is continuously increased from small to large according to a linear proportion in the set descending operation time length of the oil cylinder under the control of a third variable control hydraulic valve, and hydraulic oil is output to drive the variable hydraulic motor to continuously accelerate and rotate from a low rotating speed to a high rotating speed according to the linear proportion;
therefore, the bidirectional proportional variable hydraulic pump and the variable hydraulic motor work together to drive the flywheel to continuously rotate in an accelerated manner from a low rotating speed to a high rotating speed according to a linear proportion, so that the potential energy of the underground sucker rod is stored;
when the timing of the downlink operation time of the oil cylinder is finished, on one hand, the discharge capacity of the proportional variable hydraulic pump is continuously reduced from large to small according to a linear proportion in the set uplink operation time of the oil cylinder under the control of a third variable control hydraulic valve, and hydraulic oil is output to drive the variable hydraulic motor to continuously decelerate and rotate from a high rotating speed to a low rotating speed according to the linear proportion; on the other hand, the flywheel starts to continuously rotate in a decelerating way from a high rotating speed to a low rotating speed, and the energy stored when the oil cylinder moves upwards is released;
meanwhile, the bidirectional proportional variable hydraulic pump is switched to a pump working condition under the control of the first variable control hydraulic valve, and outputs hydraulic oil to the oil cylinder under the drive of the variable hydraulic motor and the flywheel, so that the piston rod of the oil cylinder is driven to move upwards, the underground oil well pump is driven to move upwards through the underground sucker rod, and crude oil in the oil well is lifted to the ground.
Further, in the operation process of the oil cylinder, according to the requirement of the oil well lifting frequency, the downlink operation time and the uplink operation time of the oil cylinder are set, and the continuous increasing time and the continuous decreasing time of the discharge capacity of the proportional variable hydraulic pump are respectively equal to the downlink operation time and the uplink operation time of the oil cylinder, namely: the oil cylinder downlink operation time length is the continuous increase time of the displacement of the proportional variable hydraulic pump, which is the flywheel acceleration time, and the oil cylinder uplink operation time length is the continuous decrease time of the displacement of the proportional variable hydraulic pump, which is the flywheel deceleration time; the operation duration of the oil cylinder is adjusted, and the continuous change time of the discharge capacity of the proportional variable hydraulic pump and the flywheel speed change time are also changed simultaneously; the displacement continuous increasing time of the proportional variable hydraulic pump is flywheel acceleration time; the displacement of the proportional variable hydraulic pump is continuously reduced for a time, namely flywheel deceleration time.
Furthermore, after the downlink running time and the uplink running time of the oil cylinder are set, the electrical control system automatically adjusts the downlink displacement and the uplink displacement of the bidirectional proportional variable hydraulic pump through the first variable control hydraulic valve, and the stroke control of the oil cylinder can be realized by means of real-time displacement detection of the oil cylinder by the displacement sensor, so that the actual stroke of the oil cylinder is equal to the set stroke of the oil cylinder; after the set stroke of the oil cylinder is manually adjusted, the electrical control system automatically adjusts the downlink displacement and the uplink displacement of the bidirectional proportional variable hydraulic pump, and the actual stroke of the oil cylinder is equal to the set stroke of the oil cylinder again.
Furthermore, with the dynamic change of the stratum productivity of the oil well, the lifting load of the oil well can dynamically change, so that the energy storage level of the flywheel, namely the high and low rotating speeds of the flywheel, also needs to dynamically change; the change of the output pressure of the proportional variable hydraulic pump in the up-down stroke of the oil cylinder is detected in real time through the pressure sensor, and the electric control system automatically adjusts the displacement change range of the proportional variable hydraulic pump through the third variable control hydraulic valve, so that the high and low rotating speeds of the flywheel are automatically adjusted, the energy storage level of the flywheel is automatically adjusted, and the motor is always kept in an energy-saving operation state.
Compared with the prior art, the invention has the following beneficial effects:
1. the flywheel device has long service life and reliable work;
2. the energy storage capacity is not influenced by the crude oil viscosity of the oil well, the installed power of the motor is small, and the motor is suitable for various oil wells such as a thin oil well, a thick oil well, a high-condensation oil well, a high-wax oil well and a deep well;
3. according to the working condition change of the oil well, the energy storage level of the flywheel is automatically adjusted, the motor balance effect is good, and the energy-saving range is large.
Drawings
FIG. 1 is a schematic view of a variable speed energy storage hydraulic pumping unit of the present invention;
FIG. 2 is a schematic diagram of the down stroke operation of the variable speed energy storage hydraulic pumping unit of the present invention;
fig. 3 is a working schematic diagram of the upstroke of the variable speed energy storage hydraulic pumping unit of the present invention.
In the figure: the hydraulic control system comprises an electric motor 1, a proportional variable hydraulic pump 2, a control hydraulic pump 3, a variable hydraulic motor 4, a flywheel 5, a bidirectional proportional variable hydraulic pump 6, a rotating speed encoder 7, a displacement sensor 8, an oil cylinder 9, a third variable control hydraulic valve 10, a second variable control hydraulic valve 11, a first variable control hydraulic valve 12, an overflow valve 13, a pressure sensor 14, an electric control system 15 and an oil well underground load 16.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
referring to fig. 1 to 3, the present invention provides a technical solution: variable speed energy storage hydraulic pumping unit includes:
the oil cylinder 9 is a piston type oil cylinder, a piston is connected with a piston rod, and the lower end of the piston rod is connected with an oil well underground load 16;
further comprising:
a high-pressure oil port of the bidirectional proportional variable hydraulic pump is communicated with a rod cavity of the oil cylinder through a hydraulic pipeline;
a variable hydraulic motor 4 which is a plunger type high-speed variable hydraulic motor;
and the left end of the flywheel 5 is coaxially connected with a variable hydraulic motor, and the right end of the flywheel is coaxially connected with a bidirectional proportional variable hydraulic pump.
Further, still include:
and the left end of the rotating speed encoder is coaxially connected with the bidirectional proportional variable hydraulic pump.
Further, the rotational speed encoder is electrically connected to the electrical control system 15. The electrical control system 15 is well known in the art and may be implemented directly using a connection.
Further, still include:
and the displacement sensor 8 is a pull-wire type displacement sensor or a magnetostrictive type displacement sensor, and the pull-wire type displacement sensor is preferentially adopted. The stay wire type displacement sensor mainly comprises a wire drum wound with a stay wire and a torsion spring, a wire drum shell, an encoder coaxially connected with the wire drum and the like, is a known technology and can be directly purchased and used. A wire drum shell of the pull-wire type displacement sensor is arranged at the top end of the oil cylinder, and the extension end of a pull wire of the pull-wire type displacement sensor is connected with the top end of a piston of the oil cylinder. The encoder detects the running position of the piston in real time through the stay wire.
Further, the displacement sensor is electrically connected with an electrical control system.
Further, still include:
the first variable control hydraulic valve 12 is provided with three hydraulic oil ports which are respectively a first left upper port, a first right upper port and a first lower port, the first right upper port is connected with an oil tank, and the first lower port is connected with a bidirectional proportional variable hydraulic pump 6.
Further, the first variable control hydraulic valve is electrically connected with an electric control system.
Further, still include:
and the second variable control hydraulic valve 11 is provided with three hydraulic oil ports which are respectively a second left upper port, a second right upper port and a second lower port, the second right upper port is connected with the oil tank, and the second lower port is connected with the variable hydraulic motor 4.
Further, the second variable control hydraulic valve is electrically connected with an electric control system.
Further, still include:
the high-pressure oil port of the proportional variable hydraulic pump is communicated with the high-pressure oil port of the variable hydraulic motor through a hydraulic pipeline;
the motor 1, the said motor right end is connected with proportional variable hydraulic pump coaxially;
and the left end of the control hydraulic pump is coaxially connected with the proportional variable hydraulic pump.
Further, still include:
and the third variable control hydraulic valve 10 is provided with three hydraulic oil ports which are respectively a third left upper port, a third right upper port and a third lower port, the third right upper port is connected with the oil tank, and the third lower port is connected with the proportional variable hydraulic pump 2.
Further, the third variable control hydraulic valve is electrically connected with an electric control system.
Further, a high-pressure oil port of the control hydraulic pump 3 is simultaneously communicated with the first left upper port, the second left upper port and the third left upper port through pipelines.
Furthermore, an overflow valve 13 is also connected to the pipeline of the high-pressure oil port of the control hydraulic pump.
Further, still include:
and the pressure sensor 14 is connected to a pipeline of a high-pressure oil port of the proportional variable hydraulic pump.
Further, the pressure sensor is electrically connected with an electrical control system.
Specifically, the electric motor 1, the proportional variable hydraulic pump 2 and the control hydraulic pump 3 are sequentially and coaxially connected in series mechanically, that is, a housing base of the electric motor 1 is fixedly connected to a base (not shown) of the hydraulic pumping unit through bolts, a housing flange of the electric motor 1 is mechanically connected to a left end flange of a housing of the proportional variable hydraulic pump 2, a shaft extension of the electric motor 1 is mechanically connected to a left end shaft extension of the proportional variable hydraulic pump 2 through a coupler, a right end flange of the housing of the proportional variable hydraulic pump 2 is mechanically connected to a flange of the housing of the control hydraulic pump 3, and a right end shaft extension of the proportional variable hydraulic pump 2 is mechanically connected to a shaft extension of the control hydraulic pump 3 through a coupler. The variable hydraulic motor 4, the flywheel 5, the bidirectional proportional variable hydraulic pump 6 and the rotation speed encoder 7 are sequentially and coaxially connected in series mechanically, namely, a base of a support frame of the flywheel 5 is fixedly connected to a base (not shown in the figure) of the hydraulic pumping unit through bolts, a shell flange of the variable hydraulic motor 4 is mechanically connected with a left flange of the support frame of the flywheel 5, a shaft extension of the variable hydraulic motor 4 is mechanically connected with a left end shaft extension of the flywheel 5 through a coupler, a right flange of the support frame of the flywheel 5 is mechanically connected with a flange of the bidirectional proportional variable hydraulic pump 6, a right end shaft extension of the flywheel 5 is mechanically connected with a shaft extension of the bidirectional proportional variable hydraulic pump 6 through a coupler, and the right end of the bidirectional proportional variable hydraulic pump 6 is connected with the rotation speed. The low-pressure oil ports of the proportional variable hydraulic pump 2, the control hydraulic pump 3, the variable hydraulic motor 4 and the bidirectional proportional variable hydraulic pump 6 are all connected with an oil tank through hydraulic pipelines, the high-pressure oil port of the proportional variable hydraulic pump 2 is connected with the high-pressure oil port of the variable hydraulic motor 4 through a hydraulic pipeline, and the high-pressure oil port of the bidirectional proportional variable hydraulic pump 6 is communicated with a rod cavity of the oil cylinder 9 through a hydraulic pipeline. A displacement sensor 8 is arranged in the oil cylinder 9, the oil cylinder is a single-action tension oil cylinder, and a rod cavity of the oil cylinder is a working oil cavity. The third variable control hydraulic valve 10, the second variable control hydraulic valve 11 and the first variable control hydraulic valve 12 are respectively provided with three hydraulic oil ports: port B, port C and port D. The respective ports B and C of the three valves are respectively communicated with a high-pressure oil port (parallelly connected with an overflow valve 13) and an oil tank of the control hydraulic pump 3 through hydraulic pipelines, and the three ports D are respectively communicated with a variable oil cylinder of the proportional variable hydraulic pump 2, the variable hydraulic motor 4 and the bidirectional proportional variable hydraulic pump 6.
The displacement sensor 8 is used for detecting the piston running position of the oil cylinder 9 in real time, so that the electric control system 15 can adjust and control the stroke of the up-and-down reciprocating motion of the oil cylinder conveniently. The speed encoder 7 is used for detecting the speed of the flywheel 5 in real time, so that the electric control system 15 can adjust and control the energy storage level of the flywheel. The pressure sensor 14 is used for detecting the output pressure of the proportional variable hydraulic pump 2 in real time, so that the electric control system 15 can automatically regulate and control the energy storage level of the flywheel conveniently.
The third variable control hydraulic valve 10, the second variable control hydraulic valve 11 and the first variable control hydraulic valve 12 are all electro-hydraulic proportional directional valves or electro-hydraulic servo valves, and control the displacement of the proportional variable hydraulic pump 2, the variable hydraulic motor 4 and the bidirectional proportional variable hydraulic pump 6 according to proportional voltage or current signals output by an electric control system 15. The variable displacement hydraulic motor 4 is a two-point hydraulic motor whose displacement is either zero or maximum under the control of a second variable displacement control hydraulic valve 11. The constant-speed motor 1 drags the proportional variable hydraulic pump 2 to rotate at a constant speed, the third variable control hydraulic valve 10 controls the displacement of the proportional variable hydraulic pump 2 to continuously increase from small to large according to a linear proportion within the set downlink operation time length of the oil cylinder 9 and continuously decrease from large to small according to the linear proportion within the set uplink operation time length of the oil cylinder 9, so that the variable hydraulic motor 4 is driven to do acceleration or deceleration rotary motion, the flywheel 5 is further driven to do acceleration or deceleration rotary motion, and the potential energy of the underground sucker rod is stored or released by the flywheel. On the premise of keeping the rotation direction unchanged, the bidirectional proportional variable hydraulic pump 6 can work under the pump working condition or the motor working condition, and the working condition conversion is carried out along with the change of the running direction of the oil cylinder 9 under the control of the first variable control hydraulic valve 12. When the pump works under the working condition, the bidirectional proportional variable hydraulic pump 6 sucks low-pressure hydraulic oil from an oil tank from the oil port S, discharges high-pressure hydraulic oil from the oil port A, and drives the oil cylinder 9 to move upwards. When the motor works under the working condition, the bidirectional proportional variable hydraulic pump 6 sucks high-pressure hydraulic oil discharged when the oil cylinder 9 descends from the oil port A, outputs torque to drive the flywheel 5 to rotate in an accelerating mode, and discharges low-pressure hydraulic oil to the oil tank from the oil port S. The displacement of the bidirectional proportional variable hydraulic pump 6 can be steplessly adjusted according to the operation speed requirement of the oil cylinder 9 no matter the bidirectional proportional variable hydraulic pump works under the pump working condition or the motor working condition.
The control method of the variable speed energy storage hydraulic pumping unit comprises the following steps:
when the timing of the up-running time of the oil cylinder 9 is finished, the bidirectional proportional variable hydraulic pump 6 is switched to the working condition of the motor under the control of the first variable control hydraulic valve 12, so that the piston rod of the oil cylinder 9 starts to move down. The oil cylinder 9 outputs high-pressure hydraulic oil under the action of the downward gravity of the underground sucker rod to drive the bidirectional proportional variable hydraulic pump 6 to output mechanical work. Meanwhile, namely the piston rod of the oil cylinder 9 moves downwards from the beginning, the displacement of the proportional variable hydraulic pump 2 is continuously increased from small to large according to a linear proportion in the set downlink operation time period of the oil cylinder 9 under the control of the third variable control hydraulic valve 10, and the output hydraulic oil drives the variable hydraulic motor 4 to continuously accelerate from a low rotating speed to a high rotating speed according to the linear proportion. Therefore, the bidirectional proportional variable hydraulic pump 6 and the variable hydraulic motor 4 work together to drive the flywheel 5 to continuously rotate in an accelerated manner from a low rotating speed to a high rotating speed according to a linear proportion, so that the potential energy of the underground sucker rod is stored.
When the timing of the downlink operation time length of the oil cylinder 9 is finished, on one hand, the displacement of the proportional variable hydraulic pump 2 is continuously reduced from large to small according to a linear proportion within the set uplink operation time length of the oil cylinder 9 under the control of a third variable control hydraulic valve 10, and the output hydraulic oil drives the variable hydraulic motor 4 to continuously decelerate and rotate from a high rotating speed to a low rotating speed according to the linear proportion; on the other hand, the flywheel 5 starts to rotate at a speed reduced continuously from a high rotation speed to a low rotation speed, and releases the energy stored when the cylinder 9 moves upward. Meanwhile, the bidirectional proportional variable hydraulic pump 6 is switched to a pump working condition under the control of the first variable control hydraulic valve 12, and outputs hydraulic oil to the oil cylinder 9 under the drive of the variable hydraulic motor 4 and the flywheel 5, so that the piston rod of the oil cylinder 9 is driven to move upwards, the underground oil well pump is driven to move upwards through the underground sucker rod, and crude oil in the oil well is lifted to the ground.
Thus, in cycles, the bidirectional proportional variable hydraulic pump 6 is alternately switched between the working condition of the motor and the working condition of the pump under the control of the first variable control hydraulic valve 12, the flywheel 5 alternately stores and releases energy, the proportional variable hydraulic pump 2 drives the variable hydraulic motor 4 to alternately accelerate and decelerate under the dragging of the motor 1 and under the variable displacement control of the third variable control hydraulic valve 10, so that the piston rod of the oil cylinder 9 alternately descends and ascends, the underground oil well pump is driven to work in a reciprocating mode through the underground sucker rod of the oil well, and the crude oil lifting of the oil well is realized.
In the operation process of the oil cylinder 9, the downlink operation time length and the uplink operation time length of the oil cylinder 9 are set according to the requirement of the oil well lifting frequency, and the continuous increasing time (namely, the flywheel acceleration time) and the continuous decreasing time (namely, the flywheel deceleration time) of the displacement of the proportional variable hydraulic pump 2 are respectively equal to the downlink operation time length and the uplink operation time length of the oil cylinder 9, namely: the time length of the downward operation of the oil cylinder 9 is the continuous increasing time of the displacement of the proportional variable hydraulic pump 2, which is the flywheel acceleration time, and the time length of the upward operation of the oil cylinder 9 is the continuous decreasing time of the displacement of the proportional variable hydraulic pump 2, which is the flywheel deceleration time. The operation time of the oil cylinder 9 is adjusted, and the continuous change time of the discharge capacity of the proportional variable hydraulic pump and the flywheel speed change time are also changed simultaneously.
After the downlink operation time length and the uplink operation time length of the oil cylinder 9 are set, the electrical control system 15 automatically adjusts the downlink displacement and the uplink displacement of the bidirectional proportional variable hydraulic pump 6 through the first variable control hydraulic valve 12, and the stroke control of the oil cylinder 9 can be realized by means of real-time displacement detection of the oil cylinder 9 by the displacement sensor 8, so that the actual stroke of the oil cylinder 9 is equal to the set stroke of the oil cylinder 9. After the set stroke of the oil cylinder 9 is manually adjusted, the electrical control system 15 automatically adjusts the descending displacement and the ascending displacement of the bidirectional proportional variable hydraulic pump 6, so that the actual stroke of the oil cylinder 9 is equal to the set stroke of the oil cylinder 9 again.
With the dynamic change of the stratum productivity of the oil well, the lifting load of the oil well can be dynamically changed, which requires the energy storage level of the flywheel (namely the high and low rotating speeds of the flywheel) to be dynamically changed. The change of the output pressure of the proportional variable hydraulic pump 2 in the up-down stroke of the oil cylinder 9 is detected in real time through the pressure sensor 14, and the electric control system 15 automatically adjusts the displacement change range of the proportional variable hydraulic pump 2 through the third variable control hydraulic valve 10, so that the high and low rotating speeds of the flywheel 5 are automatically adjusted, the energy storage level of the flywheel 5 is automatically adjusted, and the motor 1 is always kept in an energy-saving operation state.
The present invention adopts flywheel to store and release potential energy of oil well pumping rod, realizes automatic balance of motor acting in the up and down stroke of pumping unit and is suitable for high viscosity oil well and thin oil well.
Example 2:
referring to fig. 1 to 3, the present invention provides a technical solution: variable speed energy storage hydraulic pumping unit includes:
the oil cylinder 9 is a piston type oil cylinder, a piston is connected with a piston rod, and the lower end of the piston rod is connected with an oil well underground load 16;
further comprising:
a high-pressure oil port of the bidirectional proportional variable hydraulic pump is communicated with a rod cavity of the oil cylinder through a hydraulic pipeline;
a variable hydraulic motor 4 which is a plunger type high-speed variable hydraulic motor;
and the left end of the flywheel 5 is coaxially connected with a variable hydraulic motor, and the right end of the flywheel is coaxially connected with a bidirectional proportional variable hydraulic pump.
Further, still include:
and the left end of the rotating speed encoder is coaxially connected with the bidirectional proportional variable hydraulic pump.
Further, the rotational speed encoder is electrically connected to the electrical control system 15. The electrical control system 15 is well known in the art and may be implemented directly using a connection.
Further, still include:
and the displacement sensor 8 is a pull-wire type displacement sensor or a magnetostrictive type displacement sensor, and the pull-wire type displacement sensor is preferentially adopted. The stay wire type displacement sensor mainly comprises a wire drum wound with a stay wire and a torsion spring, a wire drum shell, an encoder coaxially connected with the wire drum and the like. A wire drum shell of the pull-wire type displacement sensor is arranged at the top end of the oil cylinder, and the extension end of a pull wire of the pull-wire type displacement sensor is connected with the top end of a piston of the oil cylinder. The encoder detects the running position of the piston in real time through the stay wire.
Further, the displacement sensor is electrically connected with an electrical control system.
Further, still include:
the first variable control hydraulic valve 12 is provided with three hydraulic oil ports which are respectively a first left upper port, a first right upper port and a first lower port, the first right upper port is connected with an oil tank, and the first lower port is connected with a bidirectional proportional variable hydraulic pump 6.
Further, the first variable control hydraulic valve is electrically connected with an electric control system.
Further, still include:
and the second variable control hydraulic valve 11 is provided with three hydraulic oil ports which are respectively a second left upper port, a second right upper port and a second lower port, the second right upper port is connected with the oil tank, and the second lower port is connected with the variable hydraulic motor 4.
Further, the second variable control hydraulic valve is electrically connected with an electric control system.
Further, still include:
the high-pressure oil port of the proportional variable hydraulic pump is communicated with the high-pressure oil port of the variable hydraulic motor through a hydraulic pipeline;
the motor 1, the said motor right end is connected with proportional variable hydraulic pump coaxially;
and the left end of the control hydraulic pump is coaxially connected with the proportional variable hydraulic pump.
Further, still include:
and the third variable control hydraulic valve 10 is provided with three hydraulic oil ports which are respectively a third left upper port, a third right upper port and a third lower port, the third right upper port is connected with the oil tank, and the third lower port is connected with the proportional variable hydraulic pump 2.
Further, the third variable control hydraulic valve is electrically connected with an electric control system.
Further, a high-pressure oil port of the control hydraulic pump 3 is simultaneously communicated with the first left upper port, the second left upper port and the third left upper port through pipelines.
Furthermore, an overflow valve 13 is also connected to the pipeline of the high-pressure oil port of the control hydraulic pump.
Example 3:
referring to fig. 1 to 3, the present invention provides a technical solution: variable speed energy storage hydraulic pumping unit includes:
the oil cylinder 9 is a piston type oil cylinder, a piston is connected with a piston rod, and the lower end of the piston rod is connected with an oil well underground load 16;
further comprising:
a high-pressure oil port of the bidirectional proportional variable hydraulic pump is communicated with a rod cavity of the oil cylinder through a hydraulic pipeline;
a variable hydraulic motor 4 which is a plunger type high-speed variable hydraulic motor;
and the left end of the flywheel 5 is coaxially connected with a variable hydraulic motor, and the right end of the flywheel is coaxially connected with a bidirectional proportional variable hydraulic pump.
Further, still include:
and the left end of the rotating speed encoder is coaxially connected with the bidirectional proportional variable hydraulic pump.
Further, the rotational speed encoder is electrically connected to the electrical control system 15. The electrical control system 15 is well known in the art and may be implemented directly using a connection.
Further, still include:
and the displacement sensor 8 is a pull-wire type displacement sensor or a magnetostrictive type displacement sensor, and the pull-wire type displacement sensor is preferentially adopted. The stay wire type displacement sensor mainly comprises a wire drum wound with a stay wire and a torsion spring, a wire drum shell, an encoder coaxially connected with the wire drum and the like. A wire drum shell of the pull-wire type displacement sensor is arranged at the top end of the oil cylinder, and the extension end of a pull wire of the pull-wire type displacement sensor is connected with the top end of a piston of the oil cylinder. The encoder detects the running position of the piston in real time through the stay wire.
Further, the displacement sensor is electrically connected with an electrical control system.
Further, still include:
the first variable control hydraulic valve 12 is provided with three hydraulic oil ports which are respectively a first left upper port, a first right upper port and a first lower port, the first right upper port is connected with an oil tank, and the first lower port is connected with a bidirectional proportional variable hydraulic pump 6.
Further, the first variable control hydraulic valve is electrically connected with an electric control system.
Further, still include:
and the second variable control hydraulic valve 11 is provided with three hydraulic oil ports which are respectively a second left upper port, a second right upper port and a second lower port, the second right upper port is connected with the oil tank, and the second lower port is connected with the variable hydraulic motor 4.
Further, the second variable control hydraulic valve is electrically connected with an electric control system.
Further, still include:
the high-pressure oil port of the proportional variable hydraulic pump is communicated with the high-pressure oil port of the variable hydraulic motor through a hydraulic pipeline;
the motor 1, the said motor right end is connected with proportional variable hydraulic pump coaxially;
and the left end of the control hydraulic pump is coaxially connected with the proportional variable hydraulic pump.
Further, still include:
and the third variable control hydraulic valve 10 is provided with three hydraulic oil ports which are respectively a third left upper port, a third right upper port and a third lower port, the third right upper port is connected with the oil tank, and the third lower port is connected with the proportional variable hydraulic pump 2.
Further, the third variable control hydraulic valve is electrically connected with an electric control system.
Further, a high-pressure oil port of the control hydraulic pump 3 is simultaneously communicated with the first left upper port, the second left upper port and the third left upper port through pipelines.
Example 4:
referring to fig. 1 to 3, the present invention provides a technical solution: variable speed energy storage hydraulic pumping unit includes:
the oil cylinder 9 is a piston type oil cylinder, a piston is connected with a piston rod, and the lower end of the piston rod is connected with an oil well underground load 16;
further comprising:
a high-pressure oil port of the bidirectional proportional variable hydraulic pump is communicated with a rod cavity of the oil cylinder through a hydraulic pipeline;
a variable hydraulic motor 4 which is a plunger type high-speed variable hydraulic motor;
and the left end of the flywheel 5 is coaxially connected with a variable hydraulic motor, and the right end of the flywheel is coaxially connected with a bidirectional proportional variable hydraulic pump.
Further, still include:
and the left end of the rotating speed encoder is coaxially connected with the bidirectional proportional variable hydraulic pump.
Further, the rotational speed encoder is electrically connected to the electrical control system 15. The electrical control system 15 is well known in the art and may be implemented directly using a connection.
Further, still include:
and the displacement sensor 8 is a pull-wire type displacement sensor or a magnetostrictive type displacement sensor, and the pull-wire type displacement sensor is preferentially adopted. The stay wire type displacement sensor mainly comprises a wire drum wound with a stay wire and a torsion spring, a wire drum shell, an encoder coaxially connected with the wire drum and the like. A wire drum shell of the pull-wire type displacement sensor is arranged at the top end of the oil cylinder, and the extension end of a pull wire of the pull-wire type displacement sensor is connected with the top end of a piston of the oil cylinder. The encoder detects the running position of the piston in real time through the stay wire.
Further, the displacement sensor is electrically connected with an electrical control system.
Further, still include:
the first variable control hydraulic valve 12 is provided with three hydraulic oil ports which are respectively a first left upper port, a first right upper port and a first lower port, the first right upper port is connected with an oil tank, and the first lower port is connected with a bidirectional proportional variable hydraulic pump 6.
Further, the first variable control hydraulic valve is electrically connected with an electric control system.
Further, still include:
and the second variable control hydraulic valve 11 is provided with three hydraulic oil ports which are respectively a second left upper port, a second right upper port and a second lower port, the second right upper port is connected with the oil tank, and the second lower port is connected with the variable hydraulic motor 4.
Further, the second variable control hydraulic valve is electrically connected with an electric control system.
Further, still include:
the high-pressure oil port of the proportional variable hydraulic pump is communicated with the high-pressure oil port of the variable hydraulic motor through a hydraulic pipeline;
the motor 1, the said motor right end is connected with proportional variable hydraulic pump coaxially;
and the left end of the control hydraulic pump is coaxially connected with the proportional variable hydraulic pump.
Example 5:
referring to fig. 1 to 3, the present invention provides a technical solution: variable speed energy storage hydraulic pumping unit includes:
the oil cylinder 9 is a piston type oil cylinder, a piston is connected with a piston rod, and the lower end of the piston rod is connected with an oil well underground load 16;
further comprising:
a high-pressure oil port of the bidirectional proportional variable hydraulic pump is communicated with a rod cavity of the oil cylinder through a hydraulic pipeline;
a variable hydraulic motor 4 which is a plunger type high-speed variable hydraulic motor;
and the left end of the flywheel 5 is coaxially connected with a variable hydraulic motor, and the right end of the flywheel is coaxially connected with a bidirectional proportional variable hydraulic pump.
Further, still include:
and the left end of the rotating speed encoder is coaxially connected with the bidirectional proportional variable hydraulic pump.
Further, the rotational speed encoder is electrically connected to the electrical control system 15. The electrical control system 15 is well known in the art and may be implemented directly using a connection.
Further, still include:
and the displacement sensor 8 is a pull-wire type displacement sensor or a magnetostrictive type displacement sensor, and the pull-wire type displacement sensor is preferentially adopted. The stay wire type displacement sensor mainly comprises a wire drum wound with a stay wire and a torsion spring, a wire drum shell, an encoder coaxially connected with the wire drum and the like. A wire drum shell of the pull-wire type displacement sensor is arranged at the top end of the oil cylinder, and the extension end of a pull wire of the pull-wire type displacement sensor is connected with the top end of a piston of the oil cylinder. The encoder detects the running position of the piston in real time through the stay wire.
Further, the displacement sensor is electrically connected with an electrical control system.
Further, still include:
the first variable control hydraulic valve 12 is provided with three hydraulic oil ports which are respectively a first left upper port, a first right upper port and a first lower port, the first right upper port is connected with an oil tank, and the first lower port is connected with a bidirectional proportional variable hydraulic pump 6.
Further, the first variable control hydraulic valve is electrically connected with an electric control system.
Further, still include:
and the second variable control hydraulic valve 11 is provided with three hydraulic oil ports which are respectively a second left upper port, a second right upper port and a second lower port, the second right upper port is connected with the oil tank, and the second lower port is connected with the variable hydraulic motor 4.
Further, the second variable control hydraulic valve is electrically connected with an electric control system.
Example 6:
referring to fig. 1 to 3, the present invention provides a technical solution: variable speed energy storage hydraulic pumping unit includes:
the oil cylinder 9 is a piston type oil cylinder, a piston is connected with a piston rod, and the lower end of the piston rod is connected with an oil well underground load 16;
further comprising:
a high-pressure oil port of the bidirectional proportional variable hydraulic pump is communicated with a rod cavity of the oil cylinder through a hydraulic pipeline;
a variable hydraulic motor 4 which is a plunger type high-speed variable hydraulic motor;
and the left end of the flywheel 5 is coaxially connected with a variable hydraulic motor, and the right end of the flywheel is coaxially connected with a bidirectional proportional variable hydraulic pump.
Further, still include:
and the left end of the rotating speed encoder is coaxially connected with the bidirectional proportional variable hydraulic pump.
Further, the rotational speed encoder is electrically connected to the electrical control system 15. The electrical control system 15 is well known in the art and may be implemented directly using a connection.
Further, still include:
and the displacement sensor 8 is a pull-wire type displacement sensor or a magnetostrictive type displacement sensor, and the pull-wire type displacement sensor is preferentially adopted. The stay wire type displacement sensor mainly comprises a wire drum wound with a stay wire and a torsion spring, a wire drum shell, an encoder coaxially connected with the wire drum and the like. A wire drum shell of the pull-wire type displacement sensor is arranged at the top end of the oil cylinder, and the extension end of a pull wire of the pull-wire type displacement sensor is connected with the top end of a piston of the oil cylinder. The encoder detects the running position of the piston in real time through the stay wire.
Further, the displacement sensor is electrically connected with an electrical control system.
Further, still include:
the first variable control hydraulic valve 12 is provided with three hydraulic oil ports which are respectively a first left upper port, a first right upper port and a first lower port, the first right upper port is connected with an oil tank, and the first lower port is connected with a bidirectional proportional variable hydraulic pump 6.
Further, the first variable control hydraulic valve is electrically connected with an electric control system.
Example 7:
referring to fig. 1 to 3, the present invention provides a technical solution: variable speed energy storage hydraulic pumping unit includes:
the oil cylinder 9 is a piston type oil cylinder, a piston is connected with a piston rod, and the lower end of the piston rod is connected with an oil well underground load 16;
further comprising:
a high-pressure oil port of the bidirectional proportional variable hydraulic pump is communicated with a rod cavity of the oil cylinder through a hydraulic pipeline;
a variable hydraulic motor 4 which is a plunger type high-speed variable hydraulic motor;
and the left end of the flywheel 5 is coaxially connected with a variable hydraulic motor, and the right end of the flywheel is coaxially connected with a bidirectional proportional variable hydraulic pump.
Further, still include:
and the left end of the rotating speed encoder is coaxially connected with the bidirectional proportional variable hydraulic pump.
Further, the rotational speed encoder is electrically connected to the electrical control system 15. The electrical control system 15 is well known in the art and may be implemented directly using a connection.
Further, still include:
and the displacement sensor 8 is a pull-wire type displacement sensor or a magnetostrictive type displacement sensor, and the pull-wire type displacement sensor is preferentially adopted. The stay wire type displacement sensor mainly comprises a wire drum wound with a stay wire and a torsion spring, a wire drum shell, an encoder coaxially connected with the wire drum and the like. A wire drum shell of the pull-wire type displacement sensor is arranged at the top end of the oil cylinder, and the extension end of a pull wire of the pull-wire type displacement sensor is connected with the top end of a piston of the oil cylinder. The encoder detects the running position of the piston in real time through the stay wire.
Further, the displacement sensor is electrically connected with an electrical control system.
Example 8:
referring to fig. 1 to 3, the present invention provides a technical solution: variable speed energy storage hydraulic pumping unit includes:
the oil cylinder 9 is a piston type oil cylinder, a piston is connected with a piston rod, and the lower end of the piston rod is connected with an oil well underground load 16;
further comprising:
a high-pressure oil port of the bidirectional proportional variable hydraulic pump is communicated with a rod cavity of the oil cylinder through a hydraulic pipeline;
a variable hydraulic motor 4 which is a plunger type high-speed variable hydraulic motor;
and the left end of the flywheel 5 is coaxially connected with a variable hydraulic motor, and the right end of the flywheel is coaxially connected with a bidirectional proportional variable hydraulic pump.
Further, still include:
and the left end of the rotating speed encoder is coaxially connected with the bidirectional proportional variable hydraulic pump.
Although fig. 1 to 3 are used in all the above embodiments, it is obvious to those skilled in the art that separate drawings are not shown as long as the parts or structural features missing in the embodiments are removed from the drawings. As will be clear to the skilled person. Of course, the embodiments with more components are only the best embodiments, and the embodiments with less components are the basic embodiments, but the basic objects of the invention can also be achieved, so all of them are within the protection scope of the invention.
All parts and parts which are not discussed in the present application and the connection mode of all parts and parts in the present application belong to the known technology in the technical field, and are not described again. Such as welding, threading, bolting, etc. The diagrammatic illustration of the invention is thus fully apparent, the mechanical construction of each component being not subject to modification, and the details of the particular connections of all the components will be apparent to those skilled in the art.
In the present invention, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (20)
1. Variable speed energy storage hydraulic pumping unit includes:
the oil cylinder is a piston type oil cylinder, a piston is connected with a piston rod, and the lower end of the piston rod is connected with an oil well underground load;
it is characterized by also comprising:
a high-pressure oil port of the bidirectional proportional variable hydraulic pump is communicated with a rod cavity of the oil cylinder through a hydraulic pipeline;
the variable hydraulic motor is a plunger type high-speed variable hydraulic motor;
the left end of the flywheel is coaxially connected with a variable hydraulic motor, and the right end of the flywheel is coaxially connected with a bidirectional proportional variable hydraulic pump.
2. The variable speed stored energy hydraulic pumping unit of claim 1, further comprising:
and the left end of the rotating speed encoder is coaxially connected with the bidirectional proportional variable hydraulic pump.
3. The variable speed stored energy hydraulic pumping unit of claim 2, wherein the speed encoder is electrically connected to an electrical control system.
4. The variable speed stored energy hydraulic pumping unit of claim 1, 2 or 3, further comprising:
the displacement sensor is a stay wire type displacement sensor or a magnetostrictive displacement sensor.
5. The variable speed stored energy hydraulic pumping unit of claim 4, wherein the displacement sensor is electrically connected to an electrical control system.
6. The variable speed stored energy hydraulic pumping unit of claim 1, 2 or 3, further comprising:
the first variable control hydraulic valve is provided with three hydraulic oil ports which are respectively a first left upper port, a first right upper port and a first lower port, the first right upper port is connected with an oil tank, and the first lower port is connected with a bidirectional proportional variable hydraulic pump.
7. The variable speed stored energy hydraulic pumping unit of claim 6, wherein the first variable control hydraulic valve is electrically connected to an electrical control system.
8. The variable speed stored energy hydraulic pumping unit of claim 6, further comprising:
and the second variable control hydraulic valve is provided with three hydraulic oil ports which are respectively a second left upper port, a second right upper port and a second lower port, the second right upper port is connected with the oil tank, and the second lower port is connected with the variable hydraulic motor.
9. The variable speed stored energy hydraulic pumping unit of claim 8, wherein the second variable control hydraulic valve is electrically connected to an electrical control system.
10. The variable speed stored energy hydraulic pumping unit of claim 8, further comprising:
the high-pressure oil port of the proportional variable hydraulic pump is communicated with the high-pressure oil port of the variable hydraulic motor through a hydraulic pipeline;
the right end of the motor is coaxially connected with the proportional variable hydraulic pump;
and the left end of the control hydraulic pump is coaxially connected with the proportional variable hydraulic pump.
11. The variable speed stored energy hydraulic pumping unit of claim 10, further comprising:
and the third variable control hydraulic valve is provided with three hydraulic oil ports which are respectively a third left upper port, a third right upper port and a third lower port, the third right upper port is connected with the oil tank, and the third lower port is connected with the proportional variable hydraulic pump.
12. The variable speed stored energy hydraulic pumping unit of claim 11, wherein the third variable control hydraulic valve is electrically connected to an electrical control system.
13. The variable speed energy storage hydraulic pumping unit according to claim 11, wherein the high pressure port of the control hydraulic pump is simultaneously communicated with the first left upper port, the second left upper port and the third left upper port through a pipeline.
14. The variable speed energy storage hydraulic pumping unit according to claim 13, wherein an overflow valve is connected to the pipeline of the high pressure port of the control hydraulic pump.
15. The variable speed stored energy hydraulic pumping unit of claim 11 or 13, further comprising:
and the pressure sensor is connected to a pipeline of a high-pressure oil port of the proportional variable hydraulic pump.
16. The variable speed stored energy hydraulic pumping unit of claim 15, wherein the pressure sensor is electrically connected to an electrical control system.
17. The control method of the variable speed energy storage hydraulic pumping unit is characterized by comprising the following steps:
when the timing of the up running time of the oil cylinder is finished, the bidirectional proportional variable hydraulic pump is switched to the working condition of the motor under the control of the first variable control hydraulic valve, so that the piston rod of the oil cylinder starts to move downwards; the oil cylinder outputs high-pressure hydraulic oil under the action of the downward gravity of the underground sucker rod to drive the bidirectional proportional variable hydraulic pump to output mechanical work;
meanwhile, namely the piston rod of the oil cylinder moves downwards from beginning, the displacement of the proportional variable hydraulic pump is continuously increased from small to large according to a linear proportion in the set descending operation time length of the oil cylinder under the control of a third variable control hydraulic valve, and hydraulic oil is output to drive the variable hydraulic motor to continuously accelerate and rotate from a low rotating speed to a high rotating speed according to the linear proportion;
therefore, the bidirectional proportional variable hydraulic pump and the variable hydraulic motor work together to drive the flywheel to continuously rotate in an accelerated manner from a low rotating speed to a high rotating speed according to a linear proportion, so that the potential energy of the underground sucker rod is stored;
when the timing of the downlink operation time of the oil cylinder is finished, on one hand, the discharge capacity of the proportional variable hydraulic pump is continuously reduced from large to small according to a linear proportion in the set uplink operation time of the oil cylinder under the control of a third variable control hydraulic valve, and hydraulic oil is output to drive the variable hydraulic motor to continuously decelerate and rotate from a high rotating speed to a low rotating speed according to the linear proportion; on the other hand, the flywheel starts to continuously rotate in a decelerating way from a high rotating speed to a low rotating speed, and the energy stored when the oil cylinder moves upwards is released;
meanwhile, the bidirectional proportional variable hydraulic pump is switched to a pump working condition under the control of the first variable control hydraulic valve, and outputs hydraulic oil to the oil cylinder under the drive of the variable hydraulic motor and the flywheel, so that the piston rod of the oil cylinder is driven to move upwards, the underground oil well pump is driven to move upwards through the underground sucker rod, and crude oil in the oil well is lifted to the ground.
18. The method of claim 17, wherein during operation of the cylinder, the duration of the downward operation and the duration of the upward operation of the cylinder are set according to the requirement of the lifting stroke frequency of the oil well, and the duration of the continuous increase and the duration of the continuous decrease of the displacement of the proportional variable hydraulic pump are respectively equal to the duration of the downward operation and the duration of the upward operation of the cylinder, that is: the oil cylinder downlink operation time length is the continuous increase time of the displacement of the proportional variable hydraulic pump, which is the flywheel acceleration time, and the oil cylinder uplink operation time length is the continuous decrease time of the displacement of the proportional variable hydraulic pump, which is the flywheel deceleration time; the operation duration of the oil cylinder is adjusted, and the continuous change time of the discharge capacity of the proportional variable hydraulic pump and the flywheel speed change time are also changed simultaneously; the displacement continuous increasing time of the proportional variable hydraulic pump is flywheel acceleration time; the displacement of the proportional variable hydraulic pump is continuously reduced for a time, namely flywheel deceleration time.
19. The method of claim 18, wherein after the down-going duration and the up-going duration of the cylinder are set, the electrical control system automatically adjusts the down-going displacement and the up-going displacement of the bidirectional proportional variable hydraulic pump through the first variable control hydraulic valve, and the stroke control of the cylinder is realized by detecting the real-time displacement of the cylinder through the displacement sensor, so that the actual stroke of the cylinder is equal to the set stroke of the cylinder; after the set stroke of the oil cylinder is manually adjusted, the electrical control system automatically adjusts the downlink displacement and the uplink displacement of the bidirectional proportional variable hydraulic pump, and the actual stroke of the oil cylinder is equal to the set stroke of the oil cylinder again.
20. The method of claim 19, wherein the oil well lifting load is dynamically changed with the dynamic change of the oil well stratum productivity, which requires the energy storage level of the flywheel, i.e. the high and low rotation speeds of the flywheel, to be dynamically changed; the change of the output pressure of the proportional variable hydraulic pump in the up-down stroke of the oil cylinder is detected in real time through the pressure sensor, and the electric control system automatically adjusts the displacement change range of the proportional variable hydraulic pump through the third variable control hydraulic valve, so that the high and low rotating speeds of the flywheel are automatically adjusted, the energy storage level of the flywheel is automatically adjusted, and the motor is always kept in an energy-saving operation state.
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| CN201911126146.XA CN112814624A (en) | 2019-11-15 | 2019-11-15 | Variable-speed energy-storage hydraulic pumping unit and method |
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| CN201911126146.XA CN112814624A (en) | 2019-11-15 | 2019-11-15 | Variable-speed energy-storage hydraulic pumping unit and method |
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| CN (1) | CN112814624A (en) |
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