CN212297077U

CN212297077U - Hydraulic pumping unit with hydraulic control system

Info

Publication number: CN212297077U
Application number: CN202021560161.3U
Authority: CN
Inventors: 马磊; 王防华; 綦耀光; 尹冬; 马传学
Original assignee: Shandong Juneng Hydraulic Machinery Co ltd
Current assignee: Shandong Juneng Hydraulic Machinery Co ltd
Priority date: 2020-07-31
Filing date: 2020-07-31
Publication date: 2021-01-05
Anticipated expiration: 2030-07-31

Abstract

The invention discloses a hydraulic pumping unit with a hydraulic control system, which comprises a first pumping unit hydraulic cylinder and a second pumping unit hydraulic cylinder, wherein a lower cavity of each pumping unit hydraulic cylinder is connected with the hydraulic control system, and the lower end of each pumping unit hydraulic cylinder is provided with a falling mechanism for falling the pumping unit hydraulic cylinder. The device can realize the cooling of the hydraulic oil by enabling the hydraulic oil in each cycle to pass through the oil tank through the hydraulic control system; the duplex variable plunger pump motor can realize closed-loop control of working mode and displacement, fully utilizes downlink energy of the hydraulic pumping unit, greatly reduces the power consumption of the pumping unit, can realize connection of the hydraulic pumping unit and a wellhead device, can realize falling of the hydraulic pumping unit, saves time and labor and is convenient to operate; the hydraulic pumping unit hydraulic cylinder piston rod working environment can be improved through the falling mechanism, the pumping unit does not need to be moved away, the working station and the maintenance station can be conveniently replaced, and the falling convenience of the hydraulic pumping unit is enhanced.

Description

Hydraulic pumping unit with hydraulic control system

Technical Field

The invention relates to a pumping unit, in particular to a hydraulic pumping unit with a hydraulic control system.

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 be popularized and applied in a wider range and has better economic benefits. The existing hydraulic pumping unit has the following problems that firstly, the part of a hydraulic cylinder piston rod of the hydraulic pumping unit, which extends out of a hydraulic cylinder, is exposed in an atmospheric environment and belongs to an open space, wind-blown sand dust and the like are easily attached to the hydraulic cylinder piston rod to damage hydraulic pumping and sealing of a wellhead sealing box, and the service life of the hydraulic pumping unit is shortened; secondly, the pumping well needs to be moved away from the pumping unit when a pumping rod is lifted down, an oil pipe is lifted down or other operations, a certain operation space is generated for operation, the existing hydraulic pumping needs to adopt hoisting equipment to hoist the pumping unit away, the cost of the hoisting equipment needs to be additionally used, and the time efficiency is wasted.

In addition, 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 really applied to the actual production on the oil extraction operation site. 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 overcome the defects in the prior art, and provides a hydraulic pumping unit with a hydraulic control system, which can improve the working environment of a hydraulic cylinder piston rod of the hydraulic pumping unit, does not need to move away from the pumping unit, can facilitate the replacement of a working station and a maintenance station, enhances the convenience of falling the hydraulic pumping unit, can reduce the energy consumption of a hydraulic system, enhances the adaptability of the hydraulic system, and improves the energy-saving effect of the hydraulic pumping unit.

The technical scheme of the invention is as follows: a hydraulic pumping unit with a hydraulic control system comprises a first pumping unit hydraulic cylinder and a second pumping unit hydraulic cylinder, wherein the lower chamber of each pumping unit hydraulic cylinder is connected with the hydraulic control system, and the lower end of each pumping unit hydraulic cylinder is provided with a falling mechanism for falling the pumping unit hydraulic cylinder;

the laying mechanism comprises a base, a connecting cylinder, a hydraulic cylinder supporting seat, a connecting plate and a laying oil cylinder, the base is detachably connected with the wellhead device, and the free end of the base extends out of the wellhead device; the upper end and the lower end of the connecting cylinder are flange connecting ends, the lower flange connecting end of the connecting cylinder is detachably connected with the base, and the upper flange connecting end of the connecting cylinder is provided with a sealing box for sealing an annular space between a piston rod of the hydraulic cylinder and an oil pipe; the lower end of the hydraulic cylinder supporting seat is detachably connected with the connecting cylinder, the upper end of the hydraulic cylinder supporting seat is connected with a hydraulic cylinder of the hydraulic pumping unit, the hydraulic cylinder supporting seat, the connecting cylinder and the hydraulic cylinder of the hydraulic pumping unit are coaxially arranged, and an operation window is arranged on the side surface of the hydraulic cylinder supporting seat; the connecting plate comprises a first vertical plate arranged at the free end of the base and a second vertical plate rotationally connected with the first vertical plate, and one side of the second vertical plate is fixedly connected with the hydraulic cylinder supporting seat; the dumping oil cylinder comprises an oil cylinder barrel and an oil cylinder piston rod, the oil cylinder barrel is rotatably connected with the first vertical plate, and the top of the oil cylinder piston rod is rotatably connected with the second vertical plate;

the hydraulic control system comprises a main motor, a duplex pump motor and an energy accumulator, wherein the duplex pump motor comprises a first variable pump motor and a second variable pump motor which are mutually 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; a cooling device is also arranged in 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 hydraulic control system further comprises a pressure sensor for measuring 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.

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; the programmable controller is of the model SIMATIC S7-1200.

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 provided with pressure release valves for releasing hydraulic oil; and a reversing valve is arranged on the cylinder barrel of the oil cylinder.

Preferably, the first variable displacement pump motor and the second variable displacement pump motor are both variable displacement plunger pump motors.

Preferably, a sliding rail is arranged on the base, and the first vertical plate is arranged in the sliding rail in a sliding manner.

Preferably, the free end of the base is provided with a telescopic arm, and the tail end of the telescopic arm is vertically provided with a support frame for supporting a hydraulic cylinder of the hydraulic pumping unit.

Preferably, the mechanism of falling still includes the latch segment that is used for locking the sucker rod, the latch segment can be dismantled and set up the last flange joint end at the connecting cylinder.

Compared with the prior art, the invention has the following advantages: 1. after the hydraulic cylinder of the hydraulic pumping unit is laid down through the laying-down oil cylinder, the part of the piston rod of the hydraulic cylinder of the hydraulic pumping unit, which extends out of the hydraulic cylinder of the hydraulic pumping unit, is positioned in the hydraulic cylinder supporting seat, so that the piston rod is positioned in a closed space, sand, dust and the like cannot be blown to the piston rod, the cleanness of the piston rod is ensured, the working condition of the piston rod is improved, and the working life of the hydraulic pumping unit; 2. the first vertical plate, the second vertical plate and the dumping hydraulic cylinder form a special dumping device for the hydraulic pumping unit, and the connecting device has a dumping function of the hydraulic pumping unit and saves operation time efficiency. 3. The hydraulic oil in each circulation cycle passes through the oil tank and the independent cooling system, so that the cooling of the hydraulic oil can be more effectively realized, and the operation effects of the hydraulic control system and the oil cylinder of the oil pumping unit are guaranteed; 4. the duplex variable plunger pump motor can realize closed-loop control of working mode and displacement, not only can fully utilize the downlink energy of the hydraulic pumping unit, but also greatly reduce 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; 5. the device is suitable for the working modes of single wells and multiple wells, double wells can be converted into single wells for working on line, and the normal work of other wells cannot be influenced by single well maintenance; 6. when the double-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 schematic view of the oil recovery state of the present invention.

FIG. 2 is a schematic diagram of a preset toppling state without the hydraulic control system according to an embodiment of the present invention.

FIG. 3 is a schematic diagram of a state of the sucker rod without a hydraulic control system according to an embodiment of the present invention.

Fig. 4 is a schematic view of the pipe tripping state in the second embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a third embodiment of the present invention.

FIG. 6 is a flow chart of the construction of the hydraulic control system of the present invention;

FIG. 7 is a schematic illustration of twin-well operation of the hydraulic control system of the present invention;

FIG. 8 is a schematic diagram of a single well operation of the hydraulic control system of the present invention.

In the figure, 1, a wellhead device, 2, a base, 3, a connecting cylinder, 4, a hydraulic cylinder supporting seat, 41, an operation window, 51, a hydraulic cylinder barrel, 52, a hydraulic cylinder piston rod, 6, a first vertical plate, 7, a dumping oil cylinder, 71, an oil cylinder barrel, 72, an oil cylinder piston rod, 73, a reversing valve, 8, a second vertical plate, 91, a first pin shaft, 92, a second pin shaft, 93, a third pin shaft, 10, a sealing box, 11, a sucker rod, 12, a locking block, 13, an oil pipe, 14, a supporting frame, 15, a sliding rail and 16, a telescopic arm are arranged; 101. the oil tank 102, the liquid level sensor 103, the air filter 1041, the first variable displacement pump motor 1042, the second variable displacement pump motor 105, the main motor 1061, the reversing valve A1062, the reversing valve B1063, the reversing valve C1064, the reversing valve D1071, the pressure gauge A1072, the pressure gauge B1073, the pressure gauge C1071, the pressure sensor A1081, the pressure sensor B1082, the pressure sensor C1083, the

accumulator

109, 1101, the first high pressure filter 1102, the second high pressure filter 1111, the pressure relief valve A1112, 1113, the pressure relief valve C1121, the first pressure relief valve cylinder 1122, the second pumping unit cylinder 1131, the displacement sensor A1132, the displacement sensor B201, the cooling pump 202, the cooling motor 203, the cooler 204, the oil return filter 205, and the 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 pumping unit with a hydraulic control system includes a first pumping unit hydraulic cylinder 1121 and a second pumping unit hydraulic cylinder 1122, a lower chamber of each pumping unit hydraulic cylinder is connected with the hydraulic control system, and a lower end of each pumping unit hydraulic cylinder is provided with a tilting mechanism for tilting the pumping unit hydraulic cylinder.

The falling mechanism comprises a base 2, a connecting cylinder 3, a hydraulic cylinder supporting seat 4, a connecting plate and a falling oil cylinder 7; the connecting plate is first riser 6 and second riser 8 of mutual rotation connection. The upper end of the wellhead device 1 is sequentially detachably provided with a base 2, a connecting cylinder 3, a hydraulic cylinder supporting seat 4 and a hydraulic oil pumping unit hydraulic cylinder, the base 2 is detachably connected with the wellhead device 1, the free end of the base 2 extends out of the wellhead device 1, and the base 2, the connecting cylinder 3, the hydraulic cylinder supporting seat 4 and the hydraulic oil pumping unit hydraulic cylinder are coaxially arranged; the connecting cylinder 3 is of a cylindrical structure, the upper end and the lower end of the connecting cylinder are flange connecting ends, a sealing box 10 is arranged inside the upper flange connecting end of the connecting cylinder 3, and an annular space between the hydraulic cylinder piston rod 52 and the oil pipe 13 can be sealed through the sealing box 10; the side of connecting cylinder 3 is processed and is had the passageway of being connected with the production valve, need not like this dismouting production pipeline, convenient operation. As shown in fig. 1-3.

The base 2 is a double-sided wire-carrying flange and is respectively connected and fixed with the upper flange of the wellhead device 1 and the lower flange connecting end of the connecting cylinder 3 through wire-carrying bolts; the hydraulic cylinder supporting seat 4 is of a cylindrical structure, and an operation window 41 which can be opened and closed is processed on the side surface; the bottom of the first vertical plate 6 is fixedly connected with the free end of the base 2, one side of the second vertical plate 8 is fixedly connected with the hydraulic cylinder supporting seat 4, and the second vertical plate 8 and the first vertical plate 6 form a hinged structure through a second pin shaft 92; the oil cylinder 7 comprises an oil cylinder barrel 71 and an oil cylinder piston rod 72, the top end of the oil cylinder piston rod 72 and the second vertical plate 8 form a hinge structure through a third pin shaft 93, the oil cylinder barrel 71 and the first vertical plate 6 form a hinge structure through a first pin shaft 91, so that when the oil cylinder piston rod 72 conducts telescopic motion, the second vertical plate 8 can be driven to rotate around a second pin shaft 92, meanwhile, the oil cylinder barrel 71 can also rotate around the first pin shaft 91, finally, the hydraulic oil pumping unit is horizontally laid down, the abdicating is achieved, and the maintenance is facilitated. A direction change valve 73 is attached to the cylinder tube 71 of the dump cylinder 7, and the cylinder rod 72 of the dump cylinder 7 can be extended and contracted by the direction change valve 73.

As shown in fig. 1 and 6, the hydraulic control system includes a main motor 105, a dual pump motor including a first variable pump motor 1041 and a second variable pump motor 1042 connected in series, and an accumulator 109, wherein 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.

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 arranged in the oil tank 101 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 system also comprises 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 hydraulic control system and the cooling device, the working state of the electromagnetic directional valve, and the working modes and the discharge capacities of the first variable pump motor 1041 and the second variable pump motor 1042.

Example two

The hydraulic oil pumping unit is basically the same as the first embodiment, and the difference is that in order to increase the abdicating space, a sliding rail 15 is arranged on the base 2, the first vertical plate 6 is arranged in the sliding rail 15 in a sliding manner, more abdicating of the hydraulic cylinder of the hydraulic oil pumping unit can be realized through the sliding rail 15, and the operation space is increased, as shown in fig. 4.

EXAMPLE III

It is basically the same as the first embodiment, except that, in order to ensure the stability of the hydraulic cylinder of the hydraulic pumping unit, a telescopic arm 16 is arranged at the free end of the base 2, and a supporting frame 14 for supporting the hydraulic cylinder of the hydraulic pumping unit is vertically arranged at the tail end of the telescopic arm 16, as shown in fig. 5.

In addition, the connecting device also comprises a locking block 12 for locking the sucker rod 11, the locking block 12 is detachably arranged at the upper flange connecting end of the connecting cylinder 3, and thus, after the connection between the hydraulic oil pumping unit hydraulic cylinder piston rod 52 and the sucker rod 11 is disconnected, the sucker rod 11 is fixed by the locking block 12.

FIG. 1 is a schematic diagram of the connection of the first embodiment in the oil extraction state, in which the hydraulic cylinder piston rod 52 of the hydraulic pumping unit drives the pumping rod 11 to move up and down, the seal box 10 seals the annular space between the hydraulic cylinder piston rod 52 and the oil pipe 13, and the pumping rod 11 drives the oil lifted by the oil pumping unit to enter the production pipeline through the production valve on the side of the connecting cylinder 3. The operation window 41 on the side of the hydraulic cylinder supporting seat 4 is opened, the sealing box 10 can be operated, after the operation is completed, the operation window 41 is closed, the hydraulic cylinder piston rod 52 is in a closed environment, sand and dust in the air cannot enter the hydraulic cylinder supporting seat 4, and the clean operation of the hydraulic cylinder piston rod 52 is guaranteed. The pin A91, the pin B92 and the pin C93 form a triangle, wherein the length of the side where the dumping oil cylinder 7 is located is variable.

FIG. 2 is a schematic diagram of the embodiment of the first embodiment, in which the hydraulic cylinder of the hydraulic pumping unit is pre-laid, the hydraulic cylinder of the hydraulic pumping unit is first stopped, the connection between the piston rod 52 of the hydraulic cylinder of the hydraulic pumping unit and the sucker rod 11 is disconnected, and the sucker rod 11 is fixed by the locking block 12 to prevent the gravity of the sucker rod 11 from falling; then the connection between the hydraulic cylinder supporting seat 4 and the connecting cylinder 3 is released.

Fig. 3 is a schematic diagram of the first embodiment of the method for lifting the sucker rod after the hydraulic cylinder of the hydraulic pumping unit is laid down, the hydraulic source and the reversing valve 73 are firstly utilized to operate the laying cylinder 7, the hydraulic cylinder of the hydraulic pumping unit and the hydraulic cylinder supporting seat 4 are continuously inclined by taking the pin B92 as the center along with the continuous retraction of the cylinder piston rod 72, and finally the hydraulic pumping unit is laid down when the hydraulic cylinder becomes horizontal. The space satisfies sucker rod 11 and plays down this moment, accomplishes sucker rod 11 through the operation machinery and plays down. The first riser is preferably configured to move laterally and to be fixed relative to the base, and is movable in the direction of the arrow shown in fig. 3 when the hydraulic cylinder of the hydraulic pumping unit is lowered, thereby changing the distance of the hydraulic cylinder 5 or the like from the wellhead.

Fig. 4 is a schematic diagram of lifting the oil pipe 13 after the hydraulic cylinder of the hydraulic pumping unit is laid down according to the second embodiment, the connecting cylinder 3 is firstly removed from the base 2, and at this time, the space satisfies that the oil pipe 13 is lifted, and the lifting operation of the oil pipe and the underground pipe string is completed through the operation machine.

Fig. 5 is a schematic diagram of lifting and lowering the pumping rod after the hydraulic cylinder of the hydraulic pumping unit is laid down in the third embodiment, and a support frame 14 for the hydraulic cylinder of the hydraulic pumping unit is additionally mounted on the base 2 in comparison with the first embodiment.

The working principle of the hydraulic control system for double-well work is as follows:

as shown in fig. 7, the double-well operation, that is, one set of hydraulic control system of the hydraulic pumping unit simultaneously provides a hydraulic source for the hydraulic pumping unit of two wells, at this time, the second fluid path and the fourth fluid 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 fluid path disconnected state, and the reversing valve B1062 and the reversing valve C1063 are placed in a fluid path connected 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.

The working principle of the hydraulic control system for single-well work is as follows:

as shown in fig. 8, in the process of twin-well operation, when one well needs to be operated and maintained, one well needs to be stopped for operation, and the other well needs to maintain normal oil production; 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 hydraulic control system and the cooling device, 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

1. A hydraulic pumping unit with a hydraulic control system is characterized by comprising a first pumping unit hydraulic cylinder and a second pumping unit hydraulic cylinder, wherein the lower cavity of each pumping unit hydraulic cylinder is connected with the hydraulic control system, and the lower end of each pumping unit hydraulic cylinder is provided with a falling mechanism for falling the pumping unit hydraulic cylinder;

2. The hydraulic pumping unit with hydraulic control system of claim 1, wherein: 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 pumping unit with hydraulic control system of claim 1, wherein: 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 pumping unit with hydraulic control system of claim 1, wherein: the hydraulic control 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 pumping unit with hydraulic control system of claim 1, wherein: the hydraulic control system also comprises a programmable controller which is respectively and electrically connected with the pressure sensor, the displacement sensor, the temperature sensor, the first variable pump motor and the second variable pump motor; the programmable controller is of the model SIMATIC S7-1200.

6. The hydraulic pumping unit with hydraulic control system of claim 1, wherein: 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; and a reversing valve is arranged on the cylinder barrel of the oil cylinder.

7. The hydraulic pumping unit with hydraulic control system of claim 1, wherein: the first variable pump motor and the second variable pump motor are both variable plunger pump motors.

8. A hydraulic pumping unit having a hydraulic control system according to any one of claims 1 to 7, characterized in that: the base is provided with a sliding rail, and the first vertical plate is arranged in the sliding rail in a sliding mode.

9. The hydraulic pumping unit with hydraulic control system of claim 8, wherein: the free end of the base is provided with a telescopic arm, and the tail end of the telescopic arm is vertically provided with a support frame for supporting a hydraulic cylinder of the hydraulic pumping unit.

10. The hydraulic pumping unit with hydraulic control system of claim 1, wherein: the falling mechanism further comprises a locking block used for locking the sucker rod, and the locking block is detachably arranged at the upper flange connecting end of the connecting cylinder.