CN112879364A - Energy-saving hydraulic system for hydraulic pumping unit - Google Patents
Energy-saving hydraulic system for hydraulic pumping unit Download PDFInfo
- Publication number
- CN112879364A CN112879364A CN202110344761.9A CN202110344761A CN112879364A CN 112879364 A CN112879364 A CN 112879364A CN 202110344761 A CN202110344761 A CN 202110344761A CN 112879364 A CN112879364 A CN 112879364A
- Authority
- CN
- China
- Prior art keywords
- oil
- pump
- main
- supplementing
- cylinder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- 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
-
- 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
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/88—Control measures for saving energy
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
A main oil pump sucks oil from one oil cylinder, the oil pump pressurizes and pushes a piston of the other oil cylinder to rise, when the oil cylinder rises to a designated position, an electromagnetic switch is turned on, hydraulic oil in a high-position oil cylinder enters a low-position oil cylinder through a balance oil way and pushes a piston of the low-position oil cylinder to rise, after the pressures of the two oil cylinders are balanced, the electromagnetic switch is turned off, the balance oil way is disconnected, a reversing valve is reversed, residual hydraulic oil in the high-position oil cylinder is pressurized through a main pump and continues to enter the low-position oil cylinder, and the piston of the low-position oil cylinder rises until the designated position. The two oil cylinders are alternately lifted and lowered by repeating the above steps to drive the pumping rod of the oil well to lift and lower, thereby realizing the purpose of pumping oil. By means of gravitational potential energy, the balance oil way can lift half of the stroke of the oil cylinder piston, and at the moment, the motor does not need to do work, so that about 50% of electric energy can be saved.
Description
Technical Field
The invention relates to the field of hydraulic systems, in particular to an energy-saving hydraulic system of a double-well balanced hydraulic pumping unit.
Background
The energy-saving principle of the existing double-well hydraulic pumping unit is that the potential energy of the descending of the pumping rod of one well is utilized to pressurize the inlet of an oil pump, and the work done when the oil pump lifts the pumping rod of the other well is reduced to achieve the purpose of energy saving. However, during the oil pumping process, the load of the oil well is changed, the greater the viscosity of the oil, the greater the load change, for example, the maximum load of the oil well is 60KN, the difference between the maximum load lifted and the minimum load lowered is generally about 10KN, and for the oil well with high viscosity, the load difference can even reach more than 30 KN. In addition, the temperature difference between winter and summer can cause larger load difference. During the lifting process of the oil cylinder piston of the hydraulic pumping unit, the load is gradually increased, the pressure of the oil cylinder is also gradually increased from small to large, when the highest point of the stroke is reached, the pressure is maximum, when the oil cylinder piston descends, the load is gradually reduced due to the action of the buoyancy and friction force of the oil, and the pressure of the oil cylinder is also reduced. The pressure difference can reach 3-8 MPa. Under the condition, in the initial reversing stage of the hydraulic system when the hydraulic system works, because the inlet pressure of the oil pump is far higher than the outlet pressure, when the one-way oil pump is used, the oil pump can vibrate due to the reverse torque generated by pressure difference, huge noise is generated, even a motor is blocked, and the oil pump can not work normally until the inlet pressure and the outlet pressure of the oil pump are basically balanced. If use hydraulic motor, because its leakage volume is big, the pump efficiency is low, and is with high costs moreover, simultaneously because the moment of torsion that the pressure differential caused drives hydraulic motor's rotation and the rotation of motor can't be synchronous, can make the working torque of motor increase, consequently increased the acting of motor, cause energy-conserving effect poor.
Disclosure of Invention
The invention aims to solve the problem that the pressure difference generated when a twin-well hydraulic pumping unit system is reversed has adverse effect on a hydraulic system. The pressure difference is balanced by the balance oil way when the system is reversed, and the energy provided by the pressure difference is fully utilized to enable the sucker rod to ascend, so that the purposes of protecting the system to work stably, reducing working noise, prolonging the service life of the hydraulic system and further saving energy are achieved.
The technical scheme of the invention is as follows: an energy-saving hydraulic system for a hydraulic oil pumping unit comprises a main oil way, an oil supplementing oil way, a reversing oil way, a balance oil way and an overflow oil way, wherein the main oil way comprises a main motor M1, a main oil pump, a main oil way check valve, a main oil way overflow valve and a pipeline, the oil supplementing oil way comprises an oil supplementing motor M2, an oil supplementing pump, an oil supplementing check valve, an oil supplementing overflow valve and a pipeline, the reversing oil way comprises a reversing valve and a pipeline, the balance loop comprises a throttle valve, an electromagnetic switch valve and an oil way, an oil suction port of the oil supplementing pump is connected with an oil tank, an oil outlet of the oil supplementing pump is connected with an oil suction port of the main oil pump through an oil supplementing pipeline, the oil supplementing pump is connected with the main motor, the motor provides power, the oil supplementing pump is connected with the oil supplementing check valve and the oil supplementing overflow valve through pipelines, the main oil way check valve and the main oil way overflow valve are connected, the oil cylinder I and the oil cylinder II are connected through a throttle valve, an electromagnetic switch valve and an oil way, the oil cylinder I and the oil cylinder II are internally provided with oil cylinder piston rods, and magnetostrictive displacement sensors are arranged in the oil cylinder piston rods.
The oil cylinder I and the oil cylinder II are two single-action oil cylinders, and oil is supplied by a rod cavity.
The main oil circuit is used for providing power and a power oil channel for the system to work;
the oil supplementing oil circuit is used for supplementing oil for the main oil circuit and providing an oil supplementing channel;
the reversing oil path has the function of providing switching action of up-and-down motion of the two oil cylinders and the oil path channel;
the balance oil way is used for directly communicating the two oil cylinders before the two oil cylinders are reversed, so that hydraulic oil in the oil cylinder with high pressure directly flows into the oil cylinder with low pressure, and the piston of the oil cylinder with low pressure is lifted until the pressure of the two oil cylinders is balanced, thereby achieving the purposes of fully utilizing gravitational potential energy to save electricity and balancing the pressure of the two oil cylinders.
The system is switched forward, and the pressure of the two oil cylinders is balanced through the balancing oil way under the action of gravitational potential energy. Then the reversing valve is reversed, the oil pump is used for pressurizing, the oil pump continues to enter the other oil cylinder from one oil cylinder, and the piston of the oil cylinder is lifted until the specified position is reached.
The balance oil circuit realizes the balance of the pressures of the two oil cylinders through the opening and closing actions of the electromagnetic switch, and the flow rate of hydraulic oil of the balance oil circuit is adjusted through the throttle valve. According to the principle of a communicating vessel, after the balance oil paths are communicated, the pressures of the oil cylinder I and the oil cylinder II are automatically balanced, and the balance pressure is 1/2(P1+ P2).
1. And adjusting the working system.
Firstly, adjusting the stroke frequency, changing the rotating speed of a main motor M1 by adjusting the working frequency of the main motor M1, increasing or reducing the flow of a main oil pump, and realizing the speed of the oil cylinder for adjusting the lifting speed of a piston, thereby achieving the purpose of adjusting the stroke frequency.
And secondly, adjusting the stroke, and opening an oil supplementing pump to supply oil to the system when the stroke is increased, so that the total stored oil quantity of the two oil cylinders is increased to achieve the purpose of increasing the stroke. When the stroke is reduced, the total stored oil quantity of the oil cylinder is reduced through the oil drain and return box of the overflow valve of the main oil way, so that the purpose of reducing the stroke of the piston of the oil cylinder is achieved.
And thirdly, controlling by a displacement sensor in an actual stroke oil piston rod of the oil cylinder piston.
2. System oil replenishment control
The oil supplementing pump is controlled by the displacement difference of the displacements X1 and X2 measured by the displacement sensors of the two oil cylinders, when the displacement difference exceeds a set value, the oil supplementing pump is started, and when the displacement difference is smaller than the set value, the oil supplementing pump stops working. The oil compensating pump does not work at ordinary times, and the oil compensating pump starts to work only when the leakage amount of the system reaches a certain amount (the leakage amount is reflected by the displacement difference of the oil cylinder),
the invention has the beneficial technical effects that: by means of gravitational potential energy, the balance oil way can lift half of the stroke of the oil cylinder piston, and at the moment, the motor does not need to do work, so that about 50% of electric energy can be saved. Meanwhile, when the oil pump is started, the pressures of the oil suction port and the oil outlet of the oil pump are equal, reverse torque is eliminated, the oil pump is in the best working state, the pump efficiency of the oil pump is improved, the working noise is reduced, and the service life of the oil pump is greatly prolonged. Meanwhile, when the reversing valve reverses, because the pressures at the two ends of the reversing valve are equal, reversing impact abrasion and noise caused by pressure difference are eliminated, and the service life of the reversing valve can be greatly prolonged.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
Example 1
The use method of the energy-saving hydraulic system for the hydraulic pumping unit comprises the following steps:
step 1, starting an oil supplementing pump 2, and adjusting the pressure of an oil supplementing overflow valve 4 to a set safety value;
step 2, starting the main oil pump 1, adjusting the pressure of the main oil way overflow valve 3 to a set safety value, and then closing the main pump 1 and the oil supplementing pump 2;
and step 3, starting the oil supplementing motor M2 to drive the oil supplementing pump 2 to absorb oil from the oil tank, pressurizing by the oil supplementing pump 2, and entering an oil inlet of the main pump through an oil supplementing oil path.
And 4, starting a main pump after the oil supplementing pump starts to supply oil for 3 seconds, enabling hydraulic oil to enter the oil cylinder I through the reversing valve after being pressurized by the main pump, enabling a piston of the oil cylinder I to ascend, and stopping the oil supplementing pump 2 and the main oil pump 1 when the piston ascends to the top of the oil cylinder I (the piston reaches the top when being started, and the ascending distance of the piston is set according to the requirements of the oil field after normal work).
Step 5, opening a balance oil way: the throttle valve 8 is adjusted to a proper opening degree, the electromagnetic switch 9 is opened, and hydraulic oil in the oil cylinder I enters the oil cylinder II to a pressure balance position through the balance loop under the action of gravitational potential energy and then the balance loop is closed.
And 6, starting the main oil pump 1 to work, reversing the reversing valve, pressurizing residual hydraulic oil in the oil cylinder I through the main oil pump 1, pumping the residual hydraulic oil into the oil cylinder II, lifting the piston to a set position, and then, starting the oil cylinder II to lift the piston to the set position.
Repeating the steps, and enabling the system to enter a normal working state.
The main oil way check valve 5 is used for preventing hydraulic oil of the main oil way from flowing back to an oil outlet of the main oil pump 1.
Examples 2,
Steps 1, 2 and 3 are the same as those in embodiment 1, except that the positions of the oil cylinder 1 and the oil cylinder II are interchanged,
and 4, starting a main pump after the oil supplementing pump starts to supply oil for 3 seconds, enabling hydraulic oil to enter the oil cylinder II through a reversing valve after being pressurized by the main pump, enabling a piston of the oil cylinder II to ascend, and stopping the oil supplementing pump 2 and the main oil pump 1 when the piston ascends to the top of the oil cylinder II (the piston reaches the top when being started, and the ascending distance of the piston is set according to the requirements of the oil field after normal work).
Step 5, opening a balance oil way: the throttle valve 8 is adjusted to a proper opening degree, the electromagnetic switch 9 is opened, and hydraulic oil in the oil cylinder II enters the oil cylinder I to a pressure balance position through the balance loop under the action of gravitational potential energy and then the balance loop is closed.
And 6, starting the main oil pump 1 to work, reversing the reversing valve, pressurizing residual hydraulic oil in the oil cylinder II through the main oil pump 1, and then pumping the residual hydraulic oil into the oil cylinder I to lift the piston to a set position.
Repeating the steps, and enabling the system to enter a normal working state.
The main oil pump 1 sucks oil from the oil cylinder II, the oil is pressurized by the oil pump to push the piston of the oil cylinder I to rise, when the oil rises to a specified position, the electromagnetic switch 9 is opened, high-pressure hydraulic oil in the oil cylinder I enters the oil cylinder II through the balance oil way to push the piston of the oil cylinder II to rise, after the pressure of the two oil cylinders is balanced, the electromagnetic switch is closed, the balance oil way is disconnected, the reversing valve 7 is reversed, and residual hydraulic oil in the oil cylinder I is pressurized by the main pump to continue to enter the oil cylinder II, so that the piston of the oil cylinder II rises until the specified position. When the pressure of the two oil cylinders is balanced, the electromagnetic switch is closed, the balanced oil way is disconnected, the reversing valve is reversed, and the residual hydraulic oil in the oil cylinder II is pressurized by the main pump and then continuously enters the oil cylinder I, so that the piston of the oil cylinder I rises until the specified position. The above steps are repeated to make the oil cylinder I and the oil cylinder II alternately ascend and descend, so as to drive the pumping rod of the oil well to ascend and descend and realize the purpose of pumping oil.
By means of gravitational potential energy, the balance oil way can lift half of the stroke of the oil cylinder piston, and at the moment, the motor does not need to do work, so that about 50% of electric energy can be saved. Meanwhile, when the oil pump is started, the pressure of the oil inlet and the pressure of the oil outlet of the oil pump are equal, reverse torque is eliminated, the oil pump is in the best working state, the pump efficiency and the working noise of the oil pump are reduced, and the service life of the oil pump is greatly prolonged. Meanwhile, when the reversing valve reverses, because the pressures at the two ends of the reversing valve are equal, reversing impact abrasion and noise are eliminated, and the service life of the reversing valve can be greatly prolonged. The pressure impact of the system is reduced, the service life of the system is prolonged, the impact noise is reduced, and the energy is saved.
Claims (3)
1. The utility model provides an energy-conserving hydraulic system for hydraulic pumping unit, including the main oil circuit, mend the oil circuit, the switching-over oil circuit, balanced oil circuit, the overflow oil circuit, the main oil circuit includes main motor (M1), main oil pump (1), main oil circuit check valve (5), main oil circuit overflow valve (3), and the pipeline, mend the oil circuit including mend oil motor (M2), mend oil pump (2), mend oil check valve (6), mend oil overflow valve (4) and pipeline, the switching-over oil circuit includes switching-over valve (7) and pipeline, balanced return circuit includes choke valve (8), electromagnetic switch valve (9) and oil circuit, its characterized in that: an oil suction port of an oil supplementing pump (2) is connected with an oil tank, an oil outlet of the oil supplementing pump is connected with an oil suction port of a main oil pump (1) through an oil supplementing pipeline, the oil supplementing pump (2) is connected with an oil supplementing motor (M2), the main oil pump (1) is connected with a main motor (M1), the motor provides power, the oil supplementing pump is connected with an oil supplementing one-way valve (6) and an oil supplementing overflow valve (4) through pipelines, the main oil pump is connected with a main oil way one-way valve (5) and a main oil way overflow valve (3), the oil suction port and the oil outlet of the main oil pump (1) are connected with a reversing valve (7) through pipelines and are connected with two oil cylinder pipelines, an oil cylinder I (10) and an oil cylinder II (11) are connected with an oil way through a throttle valve (8) and an electromagnetic switch valve (9), the oil cylinder I (10).
2. The energy-saving hydraulic system for the hydraulic oil pumping unit according to claim 1, characterized in that: the detection pressure of the cylinder I (10) is P1, the detection pressure of the cylinder II (11) is P2, and the balance oil pressure is 1/2(P1+ P2).
3. The energy-saving hydraulic system for the hydraulic oil pumping unit according to claim 1, characterized in that: the use method of the system comprises the following steps: the system is started by pumping oil to the inlet of the main pump through the oil supplementing loop, then starting the main pump and reversing,
step 1, starting an oil supplementing pump (2), and adjusting the pressure of an oil supplementing overflow valve (4) to a set safety value;
step 2, starting the main oil pump (1), adjusting the pressure of the overflow valve (3) of the main oil way to a set safety value, and then closing the main pump (1) and the oil supplementing pump (2);
step 3, starting an oil supplementing motor (M2) to drive an oil supplementing pump (2) to absorb oil from an oil tank, pressurizing by the oil supplementing pump (2), and entering an oil inlet of a main pump through an oil supplementing oil path;
step 4, after the oil supplementing pump starts to supply oil for 3 seconds, starting a main pump, pressurizing hydraulic oil by the main pump, and then entering the oil cylinder I (10) through a reversing valve to enable a piston of the oil cylinder I (10) to ascend, and when the hydraulic oil rises to the top or a set position of the oil cylinder I (10), stopping the oil supplementing pump (2) and the main oil pump (1);
step 5, opening a balance oil way: the throttle valve (8) is adjusted to a proper opening degree, the electromagnetic switch (9) is opened, hydraulic oil in the oil cylinder I (10) enters the oil cylinder II (11) through the balance loop to a pressure balance position due to the action of gravitational potential energy, and then the balance loop is closed;
step 6, starting the main oil pump (1) to work, reversing the reversing valve at the same time, pressurizing residual hydraulic oil in the oil cylinder I (10) through the main oil pump (1), and pumping the residual hydraulic oil into the oil cylinder II (11) to lift the piston to a set position;
repeating the steps, and enabling the system to enter a normal working state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110344761.9A CN112879364A (en) | 2021-03-31 | 2021-03-31 | Energy-saving hydraulic system for hydraulic pumping unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110344761.9A CN112879364A (en) | 2021-03-31 | 2021-03-31 | Energy-saving hydraulic system for hydraulic pumping unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112879364A true CN112879364A (en) | 2021-06-01 |
Family
ID=76040400
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110344761.9A Pending CN112879364A (en) | 2021-03-31 | 2021-03-31 | Energy-saving hydraulic system for hydraulic pumping unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112879364A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113417899A (en) * | 2021-07-22 | 2021-09-21 | 齐齐哈尔和平重工集团有限公司 | Energy-saving hydraulic system applied to hydraulic pumping unit |
-
2021
- 2021-03-31 CN CN202110344761.9A patent/CN112879364A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113417899A (en) * | 2021-07-22 | 2021-09-21 | 齐齐哈尔和平重工集团有限公司 | Energy-saving hydraulic system applied to hydraulic pumping unit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101603527B (en) | Emulsion pump testing system | |
| CN101078395A (en) | Highly effective hydraulic drive fluid pump | |
| CN104632794A (en) | Electro-hydraulic servo system of direct drive type hydraulic hoist | |
| CN1657393A (en) | Push and pull cylinder variable frequency energy-saving hydraulic elevator system of balancing load by accumulator loop | |
| CN203383788U (en) | Flywheel energy-saving hydraulic pumping unit | |
| CN104047932B (en) | The potential energy recovery system of jacking equipment under Vnsteady loads and using method thereof | |
| CN112879364A (en) | Energy-saving hydraulic system for hydraulic pumping unit | |
| CN1450247A (en) | Rod free hydraulic oil pumping system | |
| CN101082334A (en) | General beam type secondary regulation hydraulic energy saving system of secondary regulation | |
| CN214465202U (en) | Energy-saving hydraulic device for hydraulic pumping unit | |
| CN203214493U (en) | Potential energy recovery hydraulic control system of lifting equipment at stable load | |
| CN113669333A (en) | Hydraulic upright post pressurization and acceleration loop and pressurization and acceleration method | |
| CN108468672B (en) | Energy-saving hydraulic system of stepping heating furnace | |
| CN214146070U (en) | Hydraulic power device of lifting equipment | |
| CN111664144B (en) | Hydraulic system of bolt type lifting platform | |
| CN219242329U (en) | Closed hydraulic system of double-pump hydraulic pumping unit | |
| CN203214495U (en) | Potential energy recycling hydraulic control system of lifting equipment | |
| CN212717504U (en) | Efficient and energy-saving hydraulic lifting system | |
| CN220081812U (en) | Energy-saving hydraulic system based on walking beam gravitational potential energy recovery | |
| CN220060065U (en) | Valve-inserted type lifting hydraulic station with rapid and slow functions | |
| CN110862047A (en) | Hydraulic control device and method for explosion-proof synchronous circuit for elevator | |
| RU202121U1 (en) | Sucker rod pump hydraulic drive | |
| CN219492269U (en) | Multifunctional hydraulic pumping unit | |
| CN214274077U (en) | Hydraulic system for hydraulic pumping unit | |
| CN113586544A (en) | Lifting hydraulic system of tubing string and use method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |