Double-well mutual balance machine and liquid combined energy-saving pumping unit

Abstract

The present application relates to a kind of one machine double well mutual balance machine liquid composite energy-saving pumping unit, including machine liquid power system, closed pipe heat dissipation system, double cylinder phase self-adjusting system, execution system and control system. Adopt the speed reduction motor drive multiple row chain to drive double rod power cylinder piston reciprocating motion, convert mechanical energy into hydraulic energy, output pressure oil drives two oil well liquid cylinder and drives pumping rod reciprocating motion.Two liquid cylinders have rod cavity intercommunication, when one liquid cylinder is at top dead center, another liquid cylinder is at bottom dead center, form two well pumping rod gravity mutual balance relationship, pressure oil only needs to overcome two well pumping rod column friction, oil column gravity, required power significantly decreases.When pressure oil leakage etc. lead to liquid cylinder phase deviation, through double cylinder phase self-adjusting system adjustment two liquid cylinder piston rod position, double cylinder phase self-adjusting system intermittent work, only when needed with small power operation, energy consumption is extremely low.The pumping unit has simple structure, reliable operation, high efficiency, energy saving is obvious and other advantages.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of oil and gas exploitation, and particularly relates to a one-machine two-well mutual balance machine-liquid composite energy-saving pumping unit. BACKGROUND

[0002] The existing oil pumping units in oilfields are mainly beam-type pumping units, and due to the limitation of the mechanical structure, even if the beam-type pumping units are leveled or optimized in weight distribution, the driving motor still has large power fluctuation in the working process, the overall energy consumption is high, and the energy-saving effect is limited. In recent years, hydraulic driving type pumping units have gradually appeared, which have certain advantages in control accuracy and energy recovery, but are limited by the problems of complex hydraulic system structure, high manufacturing cost and high failure rate, and their application in oilfields is limited.

[0003] The existing hydraulic pumping units usually use hydraulic pumps to cooperate with reversing valves or proportional valves to control hydraulic cylinders, drive the reciprocating motion of the pumping piston rod, and need to be equipped with complex hydraulic valve groups. When the hydraulic system frequently reverses, it is easy to cause oil heating and reduce the overall efficiency of the system, and the maintenance difficulty and use cost of the complex hydraulic system are high. Some researches on hydraulic pumping units propose to use accumulators to recover the gravitational potential energy generated when the pumping piston rod goes down, and release the energy again when it goes up, but the storage and release of pressure energy will lose part of the energy, and it is difficult to realize stable and efficient operation under the influence of complex downhole conditions. These factors seriously restrict the application and promotion of hydraulic pumping units.

[0004] The existing pumping units generally adopt a single-well single-machine working mode. In this mode, the energy of adjacent two oil wells cannot be effectively complementary utilized. The present application proposes a new one-machine two-well mutual balance machine-liquid composite energy-saving pumping unit. Since the well depth, pump hanging depth and pumping rod weight of adjacent two oil wells are similar, the liquid pressure transmission method can be used to realize the mutual balance of the pumping rod weight of the two oil wells. When the pumping rod of one oil well goes up, the pumping rod of the other oil well goes down, and the pumping rods of the two oil wells are always one up and one down, thereby realizing the gravitational self-balance of the pumping rods of the two wells. After a period of operation, due to oil leakage, one of the hydraulic cylinder piston rods is at the upper dead point, and the other hydraulic cylinder piston rod has not reached the lower dead point, which destroys the mutual balance phase relationship. Therefore, the present application introduces a double-cylinder phase self-adjusting system which can be started after detecting the phase deviation, actively corrects the positions of the two hydraulic cylinder piston rods, and ensures that the two hydraulic cylinders always run in the sequence of one up and one down. The double-cylinder phase self-adjusting system is mostly in the state of shutdown, and the energy required for the double-cylinder phase self-adjusting process is extremely low. The one-machine two-well mutual balance machine-liquid composite energy-saving pumping unit of the present application significantly improves the energy-saving effect, avoids the leveling balance work of conventional pumping units, avoids the main problems existing in hydraulic pumping units, and has good application prospect. SUMMARY

[0005] The technical scheme adopted in the present application is a one-machine and double-well mutual balance machine and liquid composite energy-saving pumping unit, which comprises a machine and liquid power system, a closed pipe heat dissipation system, a double-cylinder phase self-adjusting system, an execution system and a control system, the machine and liquid power system is connected with the execution system through main oil paths A, B and C to form a mutual balance hydraulic main circuit, the closed pipe heat dissipation system is integrated in part of pipe sections in the main oil paths A, B and C, the double-cylinder phase self-adjusting system is connected in parallel with the mutual balance hydraulic main circuit through phase oil paths A and B, and the control system is electrically connected with each system respectively.

[0006] The machine and liquid power system comprises a motor, a chain wheel, a plurality of rows of chains, a tensioning device, a tensioning wheel, a displacement sensor A and a double-rod power cylinder, an electric stop valve A, an electric stop valve B and an electric stop valve C, the output shaft of the motor is fixedly connected with the chain wheel, the chain wheel is in meshing transmission with the plurality of rows of chains, the plurality of rows of chains pass through the tensioning wheel and maintain the tensioning state through the tensioning device, the two ends of the plurality of rows of chains are respectively hingedly connected to the two piston rod ends of the double-rod power cylinder, and the displacement sensor A is installed on the double-rod power cylinder.

[0007] The execution system comprises a left hydraulic cylinder, a right hydraulic cylinder, a displacement sensor B installed on the left hydraulic cylinder and a displacement sensor C installed on the right hydraulic cylinder, and the left hydraulic cylinder and the right hydraulic cylinder are respectively connected with the sucker rods of two oil wells.

[0008] The left oil outlet of the double-rod power cylinder is connected with the rodless cavity of the left hydraulic cylinder through the main oil path A, the right oil outlet of the double-rod power cylinder is connected with the rodless cavity of the right hydraulic cylinder through the main oil path C, and the main oil path B directly communicates the rod cavities of the left hydraulic cylinder and the right hydraulic cylinder.

[0009] According to the above scheme, the one-machine and double-well mutual balance machine and liquid composite energy-saving pumping unit is characterized in that the closed pipe heat dissipation system comprises a closed oil pipe with heat dissipation fins and a temperature control device, and the closed oil pipe is connected with part of pipe sections in the main oil paths A, B and C.

[0010] According to the above scheme, the one-machine and double-well mutual balance machine and liquid composite energy-saving pumping unit is characterized in that the double-cylinder phase self-adjusting system comprises an oil tank, an oil filter, a hydraulic pump, a relief valve, an electromagnetic reversing valve, a hydraulic lock, an electric control valve A and an electric control valve B, the oil inlet of the hydraulic pump is communicated with the oil tank through the oil filter, the oil outlet of the hydraulic pump is divided into two paths, one path is connected to the oil inlet of the relief valve, and the other path is connected to the P port of the electromagnetic reversing valve, the oil return ports of the relief valve and the electromagnetic reversing valve are both connected to the oil tank, the A port and the B port of the electromagnetic reversing valve are respectively connected to the control ports of the hydraulic lock, and the first working port of the hydraulic lock extends the phase oil path A, and the second working port extends the phase oil path B.

[0011] According to the above scheme, the one-machine dual-well mutual balance machine liquid composite energy-saving pumping unit is characterized in that the phase oil path A is divided into two branches after being output by the first working port of the hydraulic lock, one branch is connected to the rodless cavity of the left hydraulic cylinder through the electric control valve A, and the other branch is connected to the rod cavity of the right hydraulic cylinder.

[0012] According to the above scheme, the one-machine dual-well mutual balance machine liquid composite energy-saving pumping unit is characterized in that the electric cut-off valve A is arranged in series in the main oil path A and located between the left side oil outlet of the double-rod power cylinder and the rodless cavity of the left hydraulic cylinder, the electric cut-off valve B is arranged in series in the main oil path B and located between the rod cavity of the left hydraulic cylinder and the rod cavity of the right hydraulic cylinder, and the electric cut-off valve C is arranged in series in the main oil path C and located between the right side oil outlet of the double-rod power cylinder and the rodless cavity of the right hydraulic cylinder.

[0013] According to the above scheme, the one-machine dual-well mutual balance machine liquid composite energy-saving pumping unit is characterized in that the control system comprises a programmable controller, the signal input end of the programmable controller is connected with the signal output end of the displacement sensor A, the displacement sensor B and the displacement sensor C respectively, and the control output end of the programmable controller is connected with the drive circuit of the motor, the temperature control device in the closed pipe heat dissipation system, the electromagnetic reversing valve, the electric cut-off valve A, the electric cut-off valve B, the electric cut-off valve C, the electric control valve A and the electric control valve B.

[0014] Compared with the prior art, the one-machine dual-well mutual balance machine liquid composite energy-saving pumping unit has the following beneficial effects:

[0015] 1. The motor drives the multi-row chain to drive the double-rod power cylinder, realizes the conversion of mechanical energy into hydraulic pressure, and transmits the hydraulic pressure to the left hydraulic cylinder and the right hydraulic cylinder through the main oil path, so as to complete the conversion of mechanical energy into hydraulic pressure. Compared with the traditional hydraulic pumping unit which relies on a hydraulic pump to provide driving power, the present application no longer relies on a hydraulic pump to drive the hydraulic cylinder, but completes the power exchange through the transmission of pressure oil between the two hydraulic cylinders, so that the structure is simple and the reliability is high. The leakage, volume loss, heating and wear of the hydraulic system can be significantly reduced, so that the operation efficiency is improved and the maintenance cost is reduced.

[0016] 2. The closed oil pipeline is adopted, which can effectively avoid the influence of external pollution on the system stability. The pressure oil in each hydraulic cycle is cooled by the closed oil pipeline with heat dissipation fins and a fan, which helps to realize continuous and efficient heat exchange and cooling, and ensures the long-term stable operation of the pumping unit.

[0017] 3. The double-bar phase self-adjusting system is started only when there is a phase deviation in the hydraulic cylinder, that is, when one of the hydraulic cylinder piston rods is at the top dead center and the other hydraulic cylinder piston rod is not at the bottom dead center, at which time the positions of the two hydraulic cylinder piston rods are adjusted so that the two hydraulic cylinder piston rods are respectively at the top dead center and the bottom dead center, the system runs at a small power, and the energy consumption is extremely low.

[0018] 4. The rod cavities of the left and right hydraulic cylinders are connected through the main oil path, and during the oil pumping process, one hydraulic cylinder piston rod descends to discharge oil, and the other hydraulic cylinder piston rod ascends to pump oil, forming a gravity mutual balance relationship between the two well pumping rods, effectively reducing the driving energy consumption and improving the overall system efficiency, and being suitable for the double-well cooperative operation scene with similar load conditions. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is the working principle diagram of the present application.

[0020] Figure 2 is the overall layout schematic diagram of the present application.

[0021] In the figure: 1-machine hydraulic power system, 101-motor, 102-chain wheel, 103-multiple row chain, 104-tensioning device, 105-tensioning wheel, 106-displacement sensor A, 107-double-bar power cylinder, 108-electric shut-off valve A, 109-electric shut-off valve B, 110-electric shut-off valve C, 2-closed tube heat dissipation system, 3-double-cylinder phase self-adjusting system, 301-oil tank, 302-oil filter, 303-hydraulic pump, 304-overflow valve, 305-electromagnetic reversing valve, 306-hydraulic lock, 307-electric control valve A, 308-electric control valve B, 4-execution system, 401-left hydraulic cylinder, 402-right hydraulic cylinder, 403-displacement sensor B, 404-displacement sensor C, 5-control system, 601-main oil path A, 602-main oil path B, 603-main oil path C, 604-phase oil path A, 605-phase oil path B. DETAILED DESCRIPTION

[0022] The technical solutions of the present application will be described clearly and completely below in combination with the drawings of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0023] The following is a further description of the present application in combination with the drawings and embodiments.

[0024] Reference Figure 1 , Figure 2As shown, the present application comprises a machine-hydraulic power system 1, a closed pipe heat dissipation system 2, a double-cylinder phase self-adjusting system 3, an execution system 4 and a control system 5, the machine-hydraulic power system 1 is connected with the execution system 4 through main oil paths A 601, B 602 and C 603 to form a mutual balance hydraulic main circuit, the closed pipe heat dissipation system 2 is integrated in part of pipe sections in the main oil paths A 601, B 602 and C 603, the double-cylinder phase self-adjusting system 3 is connected in parallel with the mutual balance hydraulic main circuit through phase oil paths A 604 and B 605, and the control system 5 is electrically connected with each of the above systems to monitor the running state of the whole machine and output control instructions to each system.

[0025] The machine-hydraulic power system 1 comprises a motor 101, a chain wheel 102, a multi-row chain 103, a tensioning device 104, a tensioning wheel 105, a displacement sensor A 106 and a double-rod power cylinder 107, an electric shut-off valve A 108, an electric shut-off valve B 109 and an electric shut-off valve C 110, the output shaft of the motor 101 is fixedly connected with the chain wheel 102, the chain wheel 102 is in meshing transmission with the multi-row chain 103, the multi-row chain 103 passes through the tensioning wheel 105 and maintains its tensioning state through the tensioning device 104, both ends of the multi-row chain 103 are hingedly connected with the piston rod ends of the double-rod power cylinder 107 on both sides, and the displacement sensor A 106 is installed on the double-rod power cylinder 107.

[0026] The displacement sensor A 106 is used to collect the piston stroke data of the double-rod power cylinder 107, when the motor 101 drives the multi-row chain 103 to move through the chain wheel 102, the multi-row chain 103 drives the piston of the double-rod power cylinder 107 to reciprocate, thereby converting the mechanical energy output by the motor 101 into hydraulic energy.

[0027] The execution system 4 comprises a left hydraulic cylinder 401, a right hydraulic cylinder 402, a displacement sensor B 403 installed on the left hydraulic cylinder 401 and a displacement sensor C 404 installed on the right hydraulic cylinder 402, and the left hydraulic cylinder 401 and the right hydraulic cylinder 402 are respectively connected with the sucker rods of two oil wells.

[0028] The left oil outlet of the double-rod power cylinder 107 is connected with the rodless cavity of the left hydraulic cylinder 401 through the main oil path A 601, the right oil outlet of the double-rod power cylinder 107 is connected with the rodless cavity of the right hydraulic cylinder 402 through the main oil path C 603, and the main oil path B 602 directly communicates the rod cavities of the left hydraulic cylinder 401 and the right hydraulic cylinder 402, when any hydraulic cylinder is in the downstroke, the hydraulic oil discharged therefrom is guided to the rod cavity of the other hydraulic cylinder through the main oil path B 602, so as to drive the piston rod of the hydraulic cylinder to go up, thereby forming a bidirectional transmission path of hydraulic energy between the two cylinders.

[0029] The motor 101 drives the double-rod cylinder 107 piston reciprocating motion through the chain wheel 102 and the multi-row chain 103, and the double-rod cylinder 107 is hydraulically connected with the left hydraulic cylinder 401 and the right hydraulic cylinder 402 through the main oil circuit A 601, the main oil circuit B 602 and the main oil circuit C 603, thereby forming a set of hydraulic cylinder linkage structure with mutual driving relationship. Through the above hydraulic connection structure, mechanical energy is converted into hydraulic energy under the driving of the motor 101, and the mutual balance pumping operation between the two oil wells is completed through the execution system 4.

[0030] Further, the closed pipe heat dissipation system 2 comprises a closed oil pipe with heat dissipation fins and a temperature control device, which is connected with part of the pipe sections in the main oil circuit A 601, the main oil circuit B 602 and the main oil circuit C 603, and is used for heat exchange and cooling of the pressure oil during circulation in the main oil circuit.

[0031] The temperature control device comprises a temperature sensor and a fan driving module. When the oil temperature exceeds the set threshold value, the control system 5 starts the fan to forcibly air cool the main oil circuit A 601, the main oil circuit B 602 and the main oil circuit C 603 pipe sections integrated with heat dissipation fins, realizes efficient heat exchange, effectively avoids oil pollution, and guarantees long-term stable operation of the pumping unit.

[0032] Further, the double-cylinder phase self-adjusting system 3 comprises an oil tank 301, an oil filter 302, a hydraulic pump 303, an overflow valve 304, an electromagnetic reversing valve 305, a hydraulic lock 306, an electric control valve A 307 and an electric control valve B 308. The oil inlet of the hydraulic pump 303 is communicated with the oil tank 301 through the oil filter 302. The oil outlet of the hydraulic pump 303 is divided into two routes, one of which is connected to the oil inlet of the overflow valve 304, and the other of which is connected to the P port of the electromagnetic reversing valve 305. The oil return ports of the overflow valve 304 and the electromagnetic reversing valve 305 are both connected to the oil tank 301. The A port and the B port of the electromagnetic reversing valve 305 are respectively connected to the control ports of the hydraulic lock 306. The first working port of the hydraulic lock 306 extends the phase oil circuit A 604, and the second working port extends the phase oil circuit B 605.

[0033] The phase oil circuit A 604 is divided into two branches after being output from the first working port of the hydraulic lock 306, one of which is connected to the rodless chamber of the left hydraulic cylinder 401 after passing through the electric control valve A 307, and the other of which is connected to the rod chamber of the right hydraulic cylinder 402. The phase oil circuit B 605 is also divided into two branches after being output from the other working port of the hydraulic lock 306, one of which is connected to the rodless chamber of the right hydraulic cylinder 402 after passing through the electric control valve B 308, and the other of which is connected to the rod chamber of the left hydraulic cylinder 401.

[0034] Further, the electric cut-off valve A 108 is arranged in series in the main oil circuit A 601 and between the left oil outlet of the double-rod power cylinder 107 and the rodless chamber of the left hydraulic cylinder 401, the electric cut-off valve B 109 is arranged in series in the main oil circuit B 602 and between the rod chamber of the left hydraulic cylinder 401 and the rod chamber of the right hydraulic cylinder 402, and the electric cut-off valve C 110 is arranged in series in the main oil circuit C 603 and between the right oil outlet of the double-rod power cylinder 107 and the rodless chamber of the right hydraulic cylinder 402. When the phase deviation is detected by the displacement sensor B 403 and the displacement sensor C 404, the electric cut-off valve A 108, the electric cut-off valve B 109, and the electric cut-off valve C 110 are arranged to block the oil flow of the corresponding main oil circuit in the closed state, so as to realize the isolation of the hydraulic main circuit in the phase adjustment mode, and enable the double-cylinder phase self-adjusting system 3 to perform compensation adjustment through the phase oil circuit A 604 and the phase oil circuit B 605.

[0035] The displacement sensor A 106 is installed on the double-rod power cylinder 107 for collecting piston stroke data, the displacement sensor B 403 is installed on the left hydraulic cylinder 401, and the displacement sensor C 404 is installed on the right hydraulic cylinder 402, which are respectively used for detecting the displacement data of the two hydraulic cylinder piston rods.

[0036] Further, the control system 5 comprises a programmable controller, a signal input end of the programmable controller is connected with signal output ends of the displacement sensor A 106, the displacement sensor B 403, and the displacement sensor C 404, and a control output end of the programmable controller is connected with a drive circuit of the motor 101, a temperature control device in the closed tube heat dissipation system 2, the electromagnetic reversing valve 305, the electric cut-off valve A 108, the electric cut-off valve B 109, the electric cut-off valve C 110, the electric control valve A 307, and the electric control valve B 308.

[0037] The following describes a one-time use process of the application in combination with the drawings:

[0038] The displacement sensor A 106 is installed on the double-rod power cylinder 107 for detecting the piston stroke position, and the output signal thereof can be used to set the lower limit of the stroke of the piston rod of the left hydraulic cylinder 401 and the upper limit of the stroke of the piston rod of the right hydraulic cylinder 402, as well as the upper limit of the stroke of the left hydraulic cylinder 401 and the lower limit of the stroke of the right hydraulic cylinder 402, as the stroke basis for the control system 5 to judge the machine reversing.

[0039] Further, the control system 5 detects that the piston of the double-rod power cylinder 107 moves to the set left stroke limit or right stroke limit according to the stroke signal fed back by the displacement sensor A 106, controls the motor 101 to switch the rotation direction, and drives the piston of the double-rod power cylinder 107 to move reversely, so as to realize the continuous reciprocating motion.

[0040] In the normal working state of the device, the electric cut-off valve A108, the electric cut-off valve B109 and the electric cut-off valve C110 remain in the open state, and the electric control valve A307 and the electric control valve B308 are in the closed state, so as to ensure that the mutual balance hydraulic main circuit is unobstructed.

[0041] Further, when the machine with double-well mutual balance machine and hydraulic composite energy-saving pumping unit is working, the control system 5 outputs a control instruction, so that the motor 101 runs in the counterclockwise direction, drives the multiple rows of chains 103 to pull the piston of the double-rod power cylinder 107 to move to the right, the left piston rod retracts into the cylinder, the volume of the right oil cavity is reduced, and the pressure oil is discharged into the main oil circuit C603. After being cooled by the closed pipe heat dissipation system 2, the pressure oil enters the rodless cavity of the right hydraulic cylinder 402, and drives the piston rod of the right hydraulic cylinder 402 to move downward.

[0042] The downward movement of the piston rod of the right hydraulic cylinder 402 causes the volume of the rod cavity to decrease, and the pressure oil is discharged into the main oil circuit B602. After passing through the closed pipe heat dissipation system 2 and the electric cut-off valve B109, the pressure oil enters the rod cavity of the left hydraulic cylinder 401, and drives the piston rod of the left hydraulic cylinder 401 to move upward. The upward movement of the piston rod of the left hydraulic cylinder 401 causes the volume of the rodless cavity to decrease, and the pressure oil is discharged into the main oil circuit A601 and flows back to the left oil cavity of the double-rod power cylinder 107.

[0043] Further, the control system 5 controls the motor 101 to rotate according to the set stroke requirement according to the above process, so that the power of the downward movement of the piston rod of the right hydraulic cylinder 402 is converted into the power of the upward movement of the piston rod of the left hydraulic cylinder 401, so that the piston rod of the left hydraulic cylinder 401 is at the top dead center when the piston rod of the right hydraulic cylinder 402 is at the bottom dead center, forming a mutual balance phase relationship.

[0044] When the piston of the double-rod power cylinder 107 moves to the right stroke limit, the displacement sensor A106 senses a signal, and the control system 5 instructs the motor 101 to switch to clockwise rotation, and the multiple rows of chains 103 drive the piston to move to the left, forming reverse movement of the above process, and the left discharge pressure oil of the double-rod power cylinder 107 drives the left hydraulic cylinder 401 to move downward, and the pressure oil discharged from the rod cavity of the left hydraulic cylinder 401 drives the right hydraulic cylinder 402 to move upward.

[0045] In this way, the whole machine starts to work in a cycle.

[0046] During the cyclic operation process, due to factors such as oil leakage, gas mixing or unbalanced load of double wells, the piston rods of the left hydraulic cylinder 401 and the right hydraulic cylinder 402 may be out of synchronization, which destroys the original mutual balance phase relationship, that is, it is impossible to achieve the expected state that the piston rod of one of the hydraulic cylinders is at the bottom dead center while the piston rod of the other hydraulic cylinder is at the top dead center, thereby affecting the oil production efficiency and system stability.

[0047] The control system 5 collects the position signals of the left and right hydraulic cylinders 401 and 402 detected by the displacement sensors B403 and C404 in real time, and judges whether there is a phase deviation in motion in combination with the preset symmetrical motion rule. The phase deviation refers to that when one of the hydraulic cylinders is at the top dead center, the other hydraulic cylinder has not reached the bottom dead center, which destroys the mutual balance phase relationship. If the distance that one of the hydraulic cylinders has not reached the bottom dead center exceeds the set threshold range, it is determined that there is a phase deviation. Once it is detected that the phase deviation exceeds the allowed range, the control system 5 will automatically start the double-cylinder phase self-adjusting system 3 for correction, and the adjustment process is as follows.

[0048] Firstly, the control system 5 instructs to stop the motor 101 from running, and simultaneously closes the electric shut-off valve A108, the electric shut-off valve B109 and the electric shut-off valve C110 to isolate the mutual balance hydraulic main circuit of the hydraulic power system 1 and the execution system 4.

[0049] The control system 5 calculates the displacement difference between the piston rods of the two hydraulic cylinders and the top and bottom dead centers according to the real-time position signals fed back by the displacement sensors B403 and C404. If it is detected that the piston rod of the left hydraulic cylinder 401 lags behind while the piston rod of the right hydraulic cylinder 402 is normal, that is, the piston rod of the right hydraulic cylinder 402 reaches the top dead center while the piston rod of the left hydraulic cylinder 401 has not reached the bottom dead center, then the single-hydraulic-cylinder adjustment stage is entered. Subsequently, the hydraulic pump 303 is started, and the electromagnetic reversing valve 305 is switched to the left position so that the pressure oil is output to the hydraulic lock 306 to realize unlocking, the electric control valve A307 is opened, and the electric control valve B308 remains in the closed state.

[0050] At this time, the pressure oil output by the hydraulic pump 303 enters the phase oil path A604 through the unlocked hydraulic lock 306, is led to the rodless chamber of the left hydraulic cylinder 401 through the electric control valve A307, and pushes the piston rod to move downward. At the same time, the pressure oil discharged from the rod chamber of the left hydraulic cylinder 401 is led back to the oil tank 301 through the phase oil path B605 and the hydraulic lock 306.

[0051] If it is detected that the piston rod of the left hydraulic cylinder 401 is normal while the piston rod of the right hydraulic cylinder 402 lags behind, that is, the piston rod of the left hydraulic cylinder 401 reaches the top dead center while the piston rod of the right hydraulic cylinder 402 has not reached the bottom dead center, the hydraulic pump 303 is started, and the electromagnetic reversing valve 305 is switched to the right position.

[0052] The electric control valve A307 remains in the closed state, and the electric control valve B308 is opened. At this time, the pressure oil output by the hydraulic pump 303 enters the phase oil path B605 through the unlocked hydraulic lock 306, is led to the rodless chamber of the right hydraulic cylinder 402 through the electric control valve B308, and pushes the piston rod to move downward. At the same time, the pressure oil discharged from the rod chamber of the right hydraulic cylinder 402 is led back to the oil tank 301 through the phase oil path A604 and the hydraulic lock 306.

[0053] During the whole adjustment process, displacement sensor B 403 and displacement sensor C 404 continuously monitor the positions of the piston rods of the two hydraulic cylinders in real time. When it is detected that one of the piston rods is at the top dead center, the other piston rod is at the bottom dead center, and the displacement difference between the two piston rods and the preset top and bottom dead centers is less than a preset threshold, it is determined that the phase deviation adjustment is completed. At this time, the control system 5 closes the electric control valve A 307 and the electric control valve B 308, the electromagnetic reversing valve 305 returns to the neutral position, the hydraulic lock 306 is reset and locked, and the hydraulic pump 303 is closed, and the electric shut-off valve A 108, the electric shut-off valve B 109 and the electric shut-off valve C 110 are reopened. The control system 5 instructs the motor 101 to restart, and the system returns to the normal mutual balance operation state.

[0054] In the present application, the relative position relationship of each component is described according to the layout mode of the drawings in the specification, such as: front, rear, left, right, upper, lower, middle position relationship is determined according to the layout mode of the drawings in the specification, which is only for the convenience of describing the present application and simplifying the description, and is not intended to indicate or imply that the device or element must have a specific orientation, structure and operation, therefore it cannot be understood as a limitation of the present application; Figure 1 Figure 1 In the present application, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0055] In the present application, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.​

Claims

1. A mutually balanced machine-liquid composite energy-saving pumping unit with two wells, characterized by: The invention comprises a hydraulic power system (1), a closed-tube heat dissipation system (2), a dual-cylinder phase self-adjustment system (3), an execution system (4) and a control system (5); the hydraulic power system (1) is connected to the execution system (4) via a main oil circuit A (601), a main oil circuit B (602) and a main oil circuit C (603), forming a mutually balanced hydraulic main circuit; the closed-tube heat dissipation system (2) is integrated into a portion of the pipe sections in the main oil circuit A (601), the main oil circuit B (602) and the main oil circuit C (603); the execution system (4) comprises a left hydraulic cylinder (401), a right hydraulic cylinder (402), a displacement sensor B (403) installed on the left hydraulic cylinder (401) and a displacement sensor C (404) installed on the right hydraulic cylinder (402); the left hydraulic cylinder (401) and the right hydraulic cylinder (402) are respectively connected to the pumping rods of two oil wells; and the control system (5) is respectively electrically connected to the above-mentioned systems; The dual-cylinder phase self-adjusting system (3) comprises a hydraulic lock (306), an electric control valve A (307), and an electric control valve B (308). The first working port of the hydraulic lock (306) extends a phase oil circuit A (604), and the second working port extends a phase oil circuit B (605). The phase oil circuit A (604) is divided into two branches after being output from the first working port of the hydraulic lock (306), one of which is connected to the rodless cavity of the left liquid cylinder (401) after passing through the electric control valve A (307), and the other is connected to the rod cavity of the right liquid cylinder (402). The phase oil circuit B (605) is also divided into two branches after being output from the second working port of the hydraulic lock (306), one of which is connected to the rodless cavity of the right liquid cylinder (402) after passing through the electric control valve B (308), and the other is connected to the rod cavity of the left liquid cylinder (401). The hydraulic power system (1) comprises a motor (101), a sprocket (102), a multi-row chain (103), a tensioning device (104), a tensioning wheel (105), a displacement sensor A (106), a double-rod power cylinder (107), an electric stop valve A (108), an electric stop valve B (109), and an electric stop valve C (110); the output shaft of the motor (101) is fixedly connected to the sprocket (102); the sprocket (102) and the multi-row chain (103) are meshed and driven; the multi-row chain (103) passes around the tensioning wheel (105) and is maintained in a tensioned state by the tensioning device (104); the two ends of the multi-row chain (103) are respectively hinged to the piston rod ends on both sides of the double-rod power cylinder (107); and the displacement sensor A (106) is mounted on the double-rod power cylinder (107); The left oil outlet of the double-rod power cylinder (107) is connected to the rodless cavity of the left liquid cylinder (401) through the main oil circuit A (601), the right oil outlet of the double-rod power cylinder (107) is connected to the rodless cavity of the right liquid cylinder (402) through the main oil circuit C (603), and the main oil circuit B (602) directly connects the rod cavities of the left liquid cylinder (401) and the right liquid cylinder (402); The electric stop valve A (108) is arranged in series in the main oil circuit A (601) and is located between the left oil outlet of the double-rod power cylinder (107) and the rodless cavity of the left liquid cylinder (401). The electric stop valve B (109) is arranged in series in the main oil circuit B (602) and is located between the rod cavity of the left liquid cylinder (401) and the rod cavity of the right liquid cylinder (402). The electric stop valve C (110) is arranged in series in the main oil circuit C (603) and is located between the right oil outlet of the double-rod power cylinder (107) and the rodless cavity of the right liquid cylinder (402).

2. The energy-saving pumping unit with two wells and mutual balance of machine and fluid according to claim 1 is characterized in that: The closed tube heat dissipation system (2) comprises a closed oil pipe with heat dissipation fins and a temperature control device, wherein the closed oil pipe is connected to a portion of the pipe sections in the main oil circuit A (601), the main oil circuit B (602) and the main oil circuit C (603).

3. The energy-saving pumping unit with two wells and mutual balance of machine and fluid according to claim 1 is characterized in that: The dual-cylinder phase self-adjusting system (3) further comprises an oil tank (301), an oil filter (302), a hydraulic pump (303), a relief valve (304), and an electromagnetic reversing valve (305). The oil inlet of the hydraulic pump (303) is connected to the oil tank (301) through the oil filter (302). The oil outlet of the hydraulic pump (303) is divided into two paths, one path is connected to the oil inlet of the relief valve (304), and the other path is connected to the P port of the electromagnetic reversing valve (305). The oil return ports of the relief valve (304) and the electromagnetic reversing valve (305) are both connected to the oil tank (301). The A port and the B port of the electromagnetic reversing valve (305) are respectively connected to the control port of the hydraulic lock (306).

4. The energy-saving pumping unit with two wells and mutual balance of machine and fluid according to claim 3 is characterized in that: The control system (5) includes a programmable controller, wherein a signal input end of the programmable controller is respectively connected to the signal output ends of the displacement sensor A (106), the displacement sensor B (403), and the displacement sensor C (404), and a control output end of the programmable controller is connected to a drive circuit of the motor (101), a temperature control device in the closed tube heat dissipation system (2), an electromagnetic reversing valve (305), an electric stop valve A (108), an electric stop valve B (109), an electric stop valve C (110), an electric control valve A (307), and an electric control valve B (308).

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