CN111677706A - Hydraulic control system of hydraulic pumping unit - Google Patents
Hydraulic control system of hydraulic pumping unit Download PDFInfo
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- CN111677706A CN111677706A CN202010757652.5A CN202010757652A CN111677706A CN 111677706 A CN111677706 A CN 111677706A CN 202010757652 A CN202010757652 A CN 202010757652A CN 111677706 A CN111677706 A CN 111677706A
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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
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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
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/024—Installations or systems with accumulators used as a supplementary power source, e.g. to store energy in idle periods to balance pump load
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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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
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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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/042—Controlling the temperature of the fluid
- F15B21/0423—Cooling
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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
- E21B43/129—Adaptations of down-hole pump systems powered by fluid supplied from outside the borehole
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/265—Control of multiple pressure sources
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/88—Control measures for saving energy
Abstract
The invention discloses a hydraulic control system of a hydraulic pumping unit, which comprises a main hydraulic system and a cooling system. The first variable pump motor and the second variable pump motor alternately work as a motor and a pump, when the first variable pump motor is driven by hydraulic oil, the first variable pump motor and the main motor jointly drive the second variable pump motor to supply oil in a pump mode, and when the second variable pump motor is driven by the hydraulic oil, the second variable pump motor and the main motor jointly drive the first variable pump motor to supply oil in a pump mode; the system has the advantages of reduced hydraulic components and low energy consumption; the hydraulic oil in each circulation cycle can be cooled more effectively through the oil tank and the independent cooling system; the duplex variable plunger pump motor can realize closed-loop control of working mode and discharge capacity, fully utilizes downlink energy of the hydraulic pumping unit, and greatly reduces power consumption of the pumping unit.
Description
Technical Field
The invention relates to a hydraulic control system, in particular to a hydraulic control system of a hydraulic pumping unit.
Background
At present, the prime force army in the field of oil field oil extraction operation in China is still the traditional beam pumping unit, along with the continuous exploitation operation of an oil field, the liquid supply capacity of a stratum becomes worse and worse, the pump is deeper and deeper, and the beam pumping unit is exposed to the problems of high power consumption, difficult adjustment of stroke frequency, unsuitability for thick oil exploitation and the like; and the traditional oil pumping unit also has the problems of large occupied area, heavy weight and the like.
Compared with a beam pumping unit, the hydraulic pumping unit has the following advantages: the structure is compact, the weight is light, the cost is low, the work is stable, the long stroke is easy to realize, the stroke frequency is convenient to adjust, the safety protection is easy to realize, the energy-saving effect is obvious, and the like, and the device is particularly suitable for the oil extraction operation of mountainous areas, mudflats and offshore platforms. Therefore, engineering technicians in various countries have already dedicated to the development and development of the hydraulic pumping unit, so that the hydraulic pumping unit can obtain wider popularization and application and better economic benefit. The research developed in the aspect of hydraulic pumping units in China mainly focuses on the development of principle prototypes and test prototypes, and is not much really applied to the actual production on the site of oil extraction operation. The main reasons include that the hydraulic pumping unit of which the hydraulic system adopts a common switch valve and a proportional valve to control a hydraulic cylinder or a hydraulic motor has larger throttling energy loss, and the recovery rate of the energy is not high and is not approved by users; secondly, when one of the wells has a problem, all the wells need to stop running, so that the productivity of the oil field is influenced; and thirdly, the stroke and the load of the multi-well hydraulic pumping unit are close to each other by the multi-well hydraulic system, the requirement is higher, and even when the difference of the stroke lengths of the multiple wells is larger, the energy cannot be collected, so that extra power consumption is caused.
Disclosure of Invention
The invention aims to provide a hydraulic control system of a hydraulic pumping unit, which can reduce the energy consumption of a hydraulic system of the hydraulic pumping unit, enhance the adaptability of the hydraulic system and improve the energy-saving effect of the hydraulic pumping unit, aiming at the defects in the prior art.
The technical scheme of the invention is as follows: a hydraulic control system of a hydraulic pumping unit comprises:
the main hydraulic system comprises a main motor, a dual pump motor and an energy accumulator, wherein the dual pump motor comprises a first variable pump motor and a second variable pump motor which are connected in series, and an output shaft of the main motor is connected with input ends of the first variable pump motor and the second variable pump motor; an oil port at one end of the first variable pump motor is connected with an oil tank, an oil port at the other end of the first variable pump motor is provided with a first liquid path and a second liquid path, the first liquid path is connected with a lower cavity of a first pumping unit hydraulic cylinder, and the second liquid path is connected with an energy accumulator; an oil port at one end of the second variable pump motor is connected with an oil tank, an oil port at the other end of the second variable pump motor is provided with a third liquid path and a fourth liquid path, the third liquid path is connected with a lower cavity of a hydraulic cylinder of the second pumping unit, and the fourth liquid path is connected with an energy accumulator; reversing valves are respectively arranged on the first liquid path, the second liquid path, the third liquid path and the fourth liquid path;
the cooling system comprises a temperature sensor arranged in an oil tank and a cooling device arranged on a cooling loop, and an inlet and an outlet of the cooling loop are both connected with the oil tank;
when the first variable displacement pump motor is driven by hydraulic oil, the first variable displacement pump motor and the main motor drive the second variable displacement pump motor to supply oil in a pump mode, and when the second variable displacement pump motor is driven by the hydraulic oil, the second variable displacement pump motor and the main motor drive the first variable displacement pump motor in a pump mode to supply oil.
Preferably, cooling device is including setting gradually cooling pump, cooler and the oil return filter on cooling circuit, the power input end of cooling pump is connected with the cooling motor, the liquid input end and the oil tank of cooling pump are connected.
Preferably, a first high-pressure filter is arranged between the reversing valve in the first fluid path and the lower cavity of the first pumping unit fluid cylinder, and a second high-pressure filter is arranged between the reversing valve in the third fluid path and the lower cavity of the second pumping unit fluid cylinder.
Preferably, the main hydraulic system further comprises a pressure sensor for measuring hydraulic oil pressure of the hydraulic cylinder lower chamber of the first pumping unit, the hydraulic cylinder lower chamber of the second pumping unit and the energy accumulator; and displacement sensors are respectively arranged in the first pumping unit hydraulic cylinder and the second pumping unit hydraulic cylinder.
Preferably, the hydraulic control system further comprises a programmable controller, and the programmable controller is electrically connected with the pressure sensor, the displacement sensor, the temperature sensor, the first variable pump motor and the second variable pump motor respectively.
Preferably, the programmable controller is of the type SIMATIC S7-1200.
Preferably, the first variable displacement pump motor and the second variable displacement pump motor are both variable displacement plunger pump motors.
Preferably, all be equipped with the relief valve that is used for releasing hydraulic oil on the lower chamber of first beam-pumping unit hydraulic cylinder, the lower chamber of second beam-pumping unit hydraulic cylinder and the energy storage ware.
Preferably, the lower cavity of the hydraulic cylinder of the first pumping unit, the lower cavity of the hydraulic cylinder of the second pumping unit and the energy accumulator are all provided with pressure gauges for displaying the oil pressure of hydraulic oil.
Preferably, the first high-pressure filter and the second high-pressure filter are both bidirectional reversible filters; the reversing valve is a two-position two-way electromagnetic reversing valve; the displacement sensor is a pull rope displacement sensor.
Compared with the prior art, the invention has the following advantages: firstly, hydraulic oil in each cycle passes through an oil tank, and an independent cooling system can more effectively realize the cooling of the hydraulic oil, thereby ensuring the operation effect of the hydraulic system and the oil cylinder of the oil pumping unit; the duplex variable plunger pump motor can realize closed-loop control of working mode and displacement, thereby not only fully utilizing the downlink energy of the hydraulic pumping unit, but also greatly reducing the power consumption of the pumping unit; and the independent hydraulic elements for speed regulation, pressure regulation and frequent reversing are not needed, so that the hydraulic impact of the system is avoided, the hydraulic elements are few, the throttling loss is less, and the energy consumption is low; the double wells can be converted into single wells on line to work, and the normal work of other wells cannot be influenced by single well maintenance; and fourthly, when the twin-well works, the stroke and the oil quantity of the two hydraulic pumping units are not required, and the adaptability is strong.
Drawings
FIG. 1 is a flow chart of the architecture of the present invention;
FIG. 2 is a schematic illustration of dual well operation of an embodiment of the present invention;
FIG. 3 is a schematic illustration of three single well operations according to an embodiment of the present invention.
In the figure: 1. the hydraulic system comprises a main hydraulic system, 2, a cooling system, 101, an oil tank, 102, a liquid level sensor, 103, an air filter, 1041, a first variable pump motor, 1042, a second variable pump motor, 105, a main motor, 1061, a reversing valve A, 1062, a reversing valve B, 1063, a reversing valve C, 1064, a reversing valve D, 1071, a pressure gauge A, 1072, a pressure gauge B, 1073, a pressure gauge C, 1081, a pressure sensor A, 1082, a pressure sensor B, 1083, a pressure sensor C, 109, an accumulator, 1101, a first high-pressure filter, 1102, a second high-pressure filter, 1111, a pressure relief valve 1121, 1112, a pressure relief valve B, 1113, a pressure relief valve C, a first pumping unit hydraulic cylinder, a second pumping unit hydraulic cylinder, 1131, a displacement sensor A, 1132, a displacement sensor B, 201, a cooling pump 1122, 202, a cooling motor, 203, a cooler, 204, an oil return filter, 205 and a temperature sensor.
Detailed Description
The invention is further illustrated below with reference to the figures and examples.
Example one
Referring to fig. 1, a hydraulic control system of a hydraulic pumping unit includes a main hydraulic system 1 and a cooling system 2.
The main hydraulic system includes a main motor 105, a dual pump motor and an accumulator 109, the dual pump motor includes a first variable pump motor 1041 and a second variable pump motor 1042 connected in series, an output shaft of the main motor 105 is connected to input ends of the first variable pump motor 1041 and the second variable pump motor 1042, that is, the first variable pump motor 1041 and the second variable pump motor 1042 are connected to a rotating main shaft of the main motor 105 through a common rotating main shaft. The first variable displacement pump motor 1041 and the second variable displacement pump motor 1042 both select a variable displacement plunger pump motor, and the variable displacement plunger pump motor can be used for a pump (i.e. hydraulic oil is discharged through power drive of a motor and the like) and also can be used as a motor (i.e. hydraulic pressure energy is converted into torque and rotating speed which are output outwards).
An oil port at one end of the first variable pump motor 1041 is connected with the oil tank 101, an oil port at the other end of the first variable pump motor 1041 is provided with a first liquid path and a second liquid path, the first liquid path is connected with a lower cavity of a first pumping unit hydraulic cylinder 1121, and the second liquid path is connected with the energy accumulator 109; an oil port at one end of the second variable pump motor 1042 is connected with the oil tank 101, an oil port at the other end of the second variable pump motor 1042 is provided with a third liquid path and a fourth liquid path, the third liquid path is connected with a lower cavity of a second pumping unit hydraulic cylinder 1122, and the fourth liquid path is connected with the energy accumulator 109; the first liquid path, the second liquid path, the third liquid path and the fourth liquid path are respectively provided with a reversing valve A1061, a reversing valve B1062, a reversing valve C1063 and a reversing valve D1064. The method specifically comprises the following steps: the first liquid path is sequentially connected with a reversing valve B1062, a first high-pressure filter 1101 and a lower cavity of a first pumping unit hydraulic cylinder 1121, and the second liquid path is sequentially connected with a reversing valve A1061 and an energy accumulator 109; the third fluid path is connected in sequence with the reversing valve C1063, the second high pressure filter 1102 and the lower chamber of the second pumping unit cylinder 1122, and the fourth fluid path is connected in sequence with the reversing valve D1064 and the accumulator 109.
The cooling system comprises a temperature sensor 205 arranged in the oil tank 101 and a cooling device arranged on a cooling circuit, the inlet and the outlet of which are connected to the oil tank 101.
When the first variable pump motor 1041 is driven by hydraulic oil, the first variable pump motor 1041 and the main motor 105 drive the second variable pump motor 1042 together as a pump to supply oil to the outside, and when the second variable pump motor 1042 is driven by hydraulic oil, the second variable pump motor 1042 and the main motor 105 drive the first variable pump motor 1041 together as a pump to supply oil to the outside.
The cooling device comprises a cooling pump 201, a cooler 203 and an oil return filter 204 which are sequentially arranged on a cooling loop, the power input end of the cooling pump 201 is connected with a cooling motor 202, and the liquid input end of the cooling pump 201 is connected with the oil tank 101. The cooling pump 201 sucks the hydraulic oil in the oil tank 101, pressurizes the hydraulic oil, passes through the cooler 203 and the return oil filter 204 in order, and returns to the oil tank 101. The cooling system adopts a forced air cooling mode to cool the hydraulic oil.
In addition, the two-position two-way electromagnetic directional valve is selected from the directional valve A1061, the directional valve B1062, the directional valve C1063 and the directional valve D1064, the electromagnetic directional valve is in a liquid path disconnection state under the uncharged condition of the electromagnetic directional valve, and the electromagnetic directional valve is in a liquid path connection state under the charged condition of the electromagnetic directional valve. The main hydraulic system 1 is provided with a pressure gauge A1071, a pressure gauge B1072 and a pressure gauge C1073 which are respectively used for displaying the lower cavity of the hydraulic cylinder 1121 of the first pumping unit, the lower cavity of the hydraulic cylinder 1122 of the second pumping unit and the hydraulic oil pressure of hydraulic oil in the energy accumulator 109; and a pressure relief valve A1111, a pressure relief valve B1112 and a pressure relief valve C1113 are installed and respectively used for relieving the lower cavity of the first pumping unit hydraulic cylinder 1121, the lower cavity of the second pumping unit hydraulic cylinder 1122 and hydraulic oil in the energy accumulator 109. The high pressure filter is a bidirectional reversible filter. An air cleaner 103 is mounted on the upper end of the oil tank 101.
The pressure sensor a1081, the pressure sensor B1082 and the pressure sensor C1083 are respectively used for measuring the hydraulic oil pressure of the lower chamber of the first pumping unit hydraulic cylinder 1121, the lower chamber of the second pumping unit hydraulic cylinder 1122 and the hydraulic oil pressure of the energy accumulator 109; a displacement sensor A1131 and a displacement sensor B1132 are respectively installed on the first pumping unit hydraulic cylinder 1121 and the second pumping unit hydraulic cylinder 1122 and used for measuring the displacement of a hydraulic cylinder piston, and the displacement sensors are stay rope displacement sensors; a temperature sensor 205 and a liquid level sensor 102 are arranged in the oil tank 101 to measure the temperature and the liquid level of the hydraulic oil;
the hydraulic control system further includes a programmable controller, which may be a PLC programmable controller, electrically connected to the pressure sensor, the displacement sensor, the temperature sensor 205, the first variable pump motor 1041, and the second variable pump motor 1042, respectively. The programmable controller is model number SIMATIC S7-1200. The hydraulic control system can monitor oil pressure, temperature, liquid level, hydraulic cylinder piston displacement and electric parameters of the variable pump motors in real time, and control the start and stop of the main hydraulic system 1 and the cooling system 2, the working state of the electromagnetic directional valve, and the working modes and the displacement of the first variable pump motor 1041 and the second variable pump motor 1042.
Example two
The embodiment is an embodiment of the double-well operation of a hydraulic control system of a hydraulic pumping unit, and is shown in figure 2. The double-well operation, namely one set of hydraulic pumping unit hydraulic control system simultaneously provides hydraulic sources for the hydraulic pumping units of two wells, at the moment, a second liquid path and a fourth liquid path of the hydraulic control system do not participate in the operation, the reversing valve A1061 and the reversing valve D1064 are placed in a liquid path disconnection state, and the reversing valve B1062 and the reversing valve C1063 are placed in a liquid path connection state.
When the first oil well sucker rod descends, the piston rod of the first pumping unit hydraulic cylinder 1121 is driven to fall, and after hydraulic oil in the lower chamber of the first pumping unit hydraulic cylinder 1121 passes through the first high-pressure filter 1101 and the reversing valve B1062, the first variable pump motor 1041 is driven to rotate and drives the second variable pump motor 1042 together with the main motor 105 to supply oil to the outside in a pump mode. The hydraulic oil which is sucked in from the oil tank 101 and pumped out by the second variable pump motor 1042 sequentially passes through the reversing valve C1063 and the second high-pressure filter 1102 to reach the lower chamber of the second pumping unit hydraulic cylinder 1122, so as to push the piston rod of the second pumping unit hydraulic cylinder 1122 to drive the pumping rod of the second oil well to move upwards, thereby completing the primary oil lifting of the second oil well.
When the second oil well sucker rod descends, the piston rod of the second oil pumping unit hydraulic cylinder 1122 is driven to fall, hydraulic oil in the lower cavity of the second oil pumping unit hydraulic cylinder 1122 passes through the second high-pressure filter 1102 and the reversing valve C1063 to drive the second variable pump motor 1042 to rotate, and the second variable pump motor 1042 and the main motor 105 drive the first variable pump motor 1041 to supply oil outwards in a pump mode. The hydraulic oil which passes through the second variable pump motor 1042 does work and then returns to the oil tank 101, the hydraulic oil which is sucked from the oil tank 101 and pumped by the first variable pump motor 1041 sequentially passes through the reversing valve B1062 and the first high-pressure filter 1101 to reach the lower chamber of the first pumping unit hydraulic cylinder 1121, the piston rod of the first pumping unit hydraulic cylinder 1121 is pushed to drive the first oil well sucker rod to move upwards, and one-time oil lifting of the first oil well is completed.
The automatic control device, namely a programmable controller, can monitor oil pressure, temperature, liquid level, hydraulic cylinder piston displacement and electric parameters of the variable pump motor in real time, and control the start and stop of the cooling system 2, the working state of the electromagnetic directional valve, and the working mode and the discharge capacity of the variable pump motor. The automatic control device automatically starts and stops the cooling system 2 according to the set range of the temperature of the hydraulic oil, and controls the temperature of the hydraulic oil in the oil tank 101 within the target temperature range. The automatic control device automatically matches the displacement of the piston of the first pumping unit hydraulic cylinder 1121 and the piston of the second pumping unit hydraulic cylinder 1122 according to the hydraulic oil pressure in the lower chamber of the first pumping unit hydraulic cylinder 1121 and the lower chamber of the second pumping unit hydraulic cylinder 1122, so that the downward gravity energy of the pumping rod can be utilized to the maximum extent, and the purpose of energy conservation is achieved.
EXAMPLE III
The embodiment is an embodiment of single-well operation of a hydraulic control system of a hydraulic pumping unit, and is shown in figure 3. In the process of double-well operation, when one well needs operation and maintenance, one well needs to be stopped for operation, and the other well needs to maintain normal oil production operation; example three phase for example two, the second pumping unit was stopped and the first pumping unit was continued to run. At this time, only by placing the direction valve a1061 and the direction valve C1063 in the liquid path disconnection state and placing the direction valve B1062 and the direction valve D1064 in the liquid path connection state, the first liquid path and the fourth liquid path participate in the operation, and the second liquid path and the third liquid path do not participate in the operation.
When the first oil well sucker rod descends, the piston rod of the first pumping unit hydraulic cylinder 1121 is driven to fall, hydraulic oil in the lower chamber of the first pumping unit hydraulic cylinder 1121 drives the first variable pump motor 1041 to rotate through the first high-pressure filter 1101 and the reversing valve B1062, and the hydraulic oil and the main motor 105 together drive the second variable pump motor 1042 to supply oil to the outside in a pump form. The hydraulic oil that passes through the first variable pump motor 1041 does work and then returns to the oil tank 101, and the hydraulic oil that is sucked and pumped from the oil tank 101 by the second variable pump motor 1042 reaches the accumulator 109 through the directional valve D1064. After the piston rod of the first pumping unit hydraulic cylinder 1121 drops to the lowest point, the hydraulic oil in the accumulator 109 passes through the reversing valve D1064 and then drives the second variable pump motor 1042 to rotate, and the main motor 105 drives the first variable pump motor 1041 to supply oil to the outside in a pump manner. The hydraulic oil which passes through the second variable pump motor 1042 does work and then returns to the oil tank 101, the hydraulic oil which is sucked from the oil tank 101 and pumped by the first variable pump motor 1041 sequentially passes through the reversing valve B1062 and the first high-pressure filter 1101 to reach the lower chamber of the first pumping unit hydraulic cylinder 1121, the piston rod of the first pumping unit hydraulic cylinder 1121 is pushed to drive the first oil well sucker rod to move upwards, and one-time oil lifting of the first oil well is completed.
The automatic control device monitors oil pressure, temperature, liquid level, hydraulic cylinder piston displacement and electric parameters of the variable pump motor in real time, and controls the start and stop of the main hydraulic system 1 and the cooling system 2, and the working state of the reversing valve, and the working mode and the displacement of the variable pump motor. The automatic control device automatically starts and stops the cooling system 2 according to the set range of the temperature of the hydraulic oil, and controls the temperature of the hydraulic oil in the oil tank 101 within the target temperature range. The automatic control device automatically matches the displacement of the piston of the first pumping unit hydraulic cylinder 1121 with the displacement of the variable displacement pump motor and the rotating speed of the motor according to the lower cavity of the first pumping unit hydraulic cylinder 1121 and the hydraulic oil pressure in the energy accumulator 109, so that the downward gravitational energy of the pumping rod is utilized to the maximum extent, and the purpose of energy conservation is achieved.
In the embodiment, in the normal working process, the reversing valve is in a connected or disconnected state, so that the condition of frequent reversing is avoided, and hydraulic impact of a system cannot be caused.
The system has the advantages of reduced hydraulic components and low energy consumption; the hydraulic oil in each circulation cycle can be cooled more effectively through the oil tank and the independent cooling system; the duplex variable plunger pump motor can realize closed-loop control of working mode and discharge capacity, fully utilizes downlink energy of the hydraulic pumping unit, and greatly reduces power consumption of the pumping unit.
The present invention is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention, and the contents of the changes still fall within the scope of the present invention.
Claims (10)
1. A hydraulic control system of a hydraulic pumping unit is characterized by comprising:
the main hydraulic system comprises a main motor, a dual pump motor and an energy accumulator, wherein the dual pump motor comprises a first variable pump motor and a second variable pump motor which are connected in series, and an output shaft of the main motor is connected with input ends of the first variable pump motor and the second variable pump motor; an oil port at one end of the first variable pump motor is connected with an oil tank, an oil port at the other end of the first variable pump motor is provided with a first liquid path and a second liquid path, the first liquid path is connected with a lower cavity of a first pumping unit hydraulic cylinder, and the second liquid path is connected with an energy accumulator; an oil port at one end of the second variable pump motor is connected with an oil tank, an oil port at the other end of the second variable pump motor is provided with a third liquid path and a fourth liquid path, the third liquid path is connected with a lower cavity of a hydraulic cylinder of the second pumping unit, and the fourth liquid path is connected with an energy accumulator; reversing valves are respectively arranged on the first liquid path, the second liquid path, the third liquid path and the fourth liquid path;
the cooling system comprises a temperature sensor arranged in an oil tank and a cooling device arranged on a cooling loop, and an inlet and an outlet of the cooling loop are both connected with the oil tank;
when the first variable displacement pump motor is driven by hydraulic oil, the first variable displacement pump motor and the main motor drive the second variable displacement pump motor to supply oil in a pump mode, and when the second variable displacement pump motor is driven by the hydraulic oil, the second variable displacement pump motor and the main motor drive the first variable displacement pump motor in a pump mode to supply oil.
2. The hydraulic control system of the hydraulic pumping unit according to claim 1, characterized in that: the cooling device comprises a cooling pump, a cooler and an oil return filter which are sequentially arranged on a cooling loop, wherein the power input end of the cooling pump is connected with a cooling motor, and the liquid input end of the cooling pump is connected with an oil tank.
3. The hydraulic control system of the hydraulic pumping unit according to claim 2, characterized in that: and a first high-pressure filter is arranged between the reversing valve in the first liquid path and the lower cavity of the hydraulic cylinder of the first pumping unit, and a second high-pressure filter is arranged between the reversing valve in the third liquid path and the lower cavity of the hydraulic cylinder of the second pumping unit.
4. The hydraulic control system of the hydraulic pumping unit according to claim 3, characterized in that: the main hydraulic system also comprises pressure sensors for measuring the hydraulic oil pressure of the lower chamber of the hydraulic cylinder of the first pumping unit, the lower chamber of the hydraulic cylinder of the second pumping unit and the energy accumulator; and displacement sensors are respectively arranged in the first pumping unit hydraulic cylinder and the second pumping unit hydraulic cylinder.
5. The hydraulic control system of a hydraulic pumping unit according to any one of claims 1 to 4, characterized in that: the hydraulic control system further comprises a programmable controller, and the programmable controller is electrically connected with the pressure sensor, the displacement sensor, the temperature sensor, the first variable pump motor and the second variable pump motor respectively.
6. The hydraulic control system of the hydraulic pumping unit according to claim 5, characterized in that: the programmable controller is of the model SIMATIC S7-1200.
7. The hydraulic control system of the hydraulic pumping unit according to claim 1, characterized in that: the first variable pump motor and the second variable pump motor are both variable plunger pump motors.
8. The hydraulic control system of the hydraulic pumping unit according to claim 1, characterized in that: and the lower cavity of the hydraulic cylinder of the first pumping unit, the lower cavity of the hydraulic cylinder of the second pumping unit and the energy accumulator are respectively provided with a pressure release valve for releasing hydraulic oil.
9. The hydraulic control system of the hydraulic pumping unit according to claim 1, characterized in that: and pressure gauges for displaying the oil pressure of hydraulic oil are arranged on the lower cavity of the hydraulic cylinder of the first oil pumping unit, the lower cavity of the hydraulic cylinder of the second oil pumping unit and the energy accumulator.
10. The hydraulic control system of the hydraulic pumping unit according to claim 4, characterized in that: the first high-pressure filter and the second high-pressure filter are both bidirectional reversible filters; the reversing valve is a two-position two-way electromagnetic reversing valve; the displacement sensor is a pull rope displacement sensor.
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| CN202010757652.5A CN111677706A (en) | 2020-07-31 | 2020-07-31 | Hydraulic control system of hydraulic pumping unit |
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| CN202010757652.5A CN111677706A (en) | 2020-07-31 | 2020-07-31 | Hydraulic control system of hydraulic pumping unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114962395A (en) * | 2022-07-13 | 2022-08-30 | 北京航空航天大学 | Hybrid new energy hydraulic pumping unit |
-
2020
- 2020-07-31 CN CN202010757652.5A patent/CN111677706A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114962395A (en) * | 2022-07-13 | 2022-08-30 | 北京航空航天大学 | Hybrid new energy hydraulic pumping unit |
| CN114962395B (en) * | 2022-07-13 | 2023-02-28 | 北京航空航天大学 | Hybrid new energy hydraulic pumping unit |
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