A hydraulic control system and its usage method for a range-extended electric well workover rig

Abstract

The present invention relates to the field of well repair machine control technology, and in particular to a hydraulic control system and a method for using an extended-range grid-electric well repair machine. The technical solution is: the low-pressure ports of the first hydraulic pump and the second hydraulic pump are respectively connected to the hydraulic oil tank, and the high-pressure port is connected to the first hydraulic valve group; the first hydraulic valve group is respectively connected to the first pressure port and the energy storage station port of the second hydraulic valve group; the first manual reversing valve of the double valve group controls the oil supply to the hydraulic winch, and the second manual reversing valve controls the oil supply to the outrigger cylinder and the power clamp motor; the plunger hydraulic pump motor is connected to the gearbox, and the high-pressure port is connected to the second pressure port of the second hydraulic valve group. The beneficial effects are: by integrating the grid-electric motor, diesel engine, and pipe rod gravity potential energy, they are aggregated into the hydraulic accumulator; controlling the output of hydraulic energy to different working units, different operations such as lifting, tightening and unfastening of the pipe rod, moving the hydraulic winch up and down, and extending and retracting the outriggers are realized, making the control of the present invention more reasonable and more energy-saving.

Description

Technical Field

[0001] The present invention relates to the technical field of well repair machine control, and in particular to a hydraulic control system of an extended-range grid-electric well repair machine and a use method thereof. Background Art

[0002] In the petroleum industry, oilfield workover operations mainly involve inspections and repairs of oil wells for various faults or low oil production rates in oil and water wells. The process of pulling in and out the tubing rods accounts for a large proportion of the workover operation. During the process of pulling in and out the tubing rods, the workover rig's lifting hook is always in a repeated cycle of lifting and lowering. The lifting condition consumes a lot of energy, but the working time accounts for a small proportion. During the lowering condition and other auxiliary working conditions, the workover rig does almost no work and is in an intermittent working state. As a result, the high-power diesel engine runs continuously to meet the intermittent working conditions, and a large proportion of useless work is done.

[0003] The Chinese patent application number applied by our company is CN202410182364.X, and the patent name is "An Energy Recovery Extended Range Hydraulic Grid Electric Well Repair Machine and Method of Use". The extended range grid electric well repair machine includes two power units, a grid electric motor and an extended range diesel engine, which can work separately or simultaneously. It can work in grid electric power mode when light load, and in extended range diesel mode or dual power mode when medium load and heavy load. In the process of lowering the tubing rod: the gravitational potential energy of the tubing rod that was originally wasted by brake heat dissipation is recovered and stored, and the hydraulic oil stored in the accumulator group is released to work during the next operation of lifting the tubing rod, so as to achieve energy saving. The extended range grid electric well repair machine converts the traditional peak intermittent cycle power consumption mode into a continuous low power consumption work mode, which greatly reduces the installed power of the well repair machine, thereby achieving the purpose of energy saving and efficiency improvement. In this patent application document, the structural characteristics and use methods of the extended range grid electric well repair machine are explained, but the hydraulic system control and control method are not clarified. Summary of the invention

[0004] The purpose of the present invention is to provide a hydraulic control system and a method for using an extended-range grid-electric workover rig in view of the above-mentioned defects in the prior art.

[0005] The hydraulic control system of the extended-range grid-electric workover rig mentioned in the present invention has the following technical scheme: comprising a first hydraulic pump, an extended-range diesel engine, a second hydraulic pump, a grid-electric motor and a computer control system, wherein the first hydraulic pump is connected to the extended-range diesel engine, and the second hydraulic pump is connected to the grid-electric motor, wherein the first electromagnetic reversing valve, a first hydraulic valve group, a second hydraulic valve group, a double valve group, a plunger hydraulic pump motor, a second electromagnetic reversing valve, a hydraulic energy storage station, a pneumatic combination control valve, and a hydraulic oil tank are also included;

[0006] The first hydraulic valve group includes a first electromagnetic overflow valve, a second electromagnetic overflow valve, a first non-return valve, a second non-return valve, a first electro-hydraulic reversing valve, a second electro-hydraulic reversing valve, a superimposed flow valve, and a superimposed pressure reducing valve; the first hydraulic valve group has a first pressure inlet, a second pressure inlet, a first pressure outlet, a second pressure outlet, and an oil return port;

[0007] The second hydraulic valve group includes a mechanical hydraulic reversing valve, a reversing control cylinder, a hydraulically controlled one-way valve, and a third one-way valve; the second hydraulic valve group has a first pressure port and a second pressure port;

[0008] The low-pressure port of the first hydraulic pump is connected to the hydraulic oil tank, and the high-pressure port of the first hydraulic pump is connected to the first pressure inlet of the first hydraulic valve group; the displacement of the second hydraulic pump is controlled by the connected first electromagnetic reversing valve, the low-pressure port of the second hydraulic pump is connected to the hydraulic oil tank, and the high-pressure port of the second hydraulic pump is connected to the second pressure inlet of the first hydraulic valve group; the double valve group includes a first manual reversing valve, a second manual reversing valve, and a relief valve, wherein the first manual reversing valve controls the oil supply to the hydraulic winch, and the second manual reversing valve controls the oil supply to the outrigger cylinder and the power clamp motor; the plunger hydraulic pump motor is connected to the gearbox, and the displacement The amount is controlled by the second electromagnetic reversing valve, the high-pressure port of the plunger hydraulic pump motor is connected to the second pressure port of the second hydraulic valve group, and the low-pressure port of the plunger hydraulic pump motor is connected to the hydraulic oil tank; the hydraulic energy storage station is composed of a number of hydraulic accumulators in parallel, and the lower oil port of the hydraulic energy storage station is connected to the first pressure outlet of the first hydraulic valve group and the first pressure port of the second hydraulic valve group; the P port of the pneumatic combination control valve is connected to the air source, the A port is connected to the working roller clutch, the B port is connected to the second pressure relay of the computer control system, and the C port is connected to the air inlet of the reversing control cylinder and the first pressure relay of the computer control system.

[0009] Preferably, the above-mentioned first pressure outlet is connected with the lower oil port of the hydraulic accumulator station and the first pressure port of the second hydraulic valve group, the second pressure outlet is connected with the oil inlet of the double valve group, and the oil return port is connected with the hydraulic oil tank; the A port of the first electromagnetic overflow valve is connected with the first pressure inlet of the first hydraulic valve group through the first hydraulic valve group, the B port of the first electromagnetic overflow valve is connected with the oil return port of the first hydraulic valve group through the first hydraulic valve group, the A port of the second electromagnetic overflow valve is connected with the second pressure inlet of the first hydraulic valve group through the first hydraulic valve group, the B port of the second electromagnetic overflow valve is connected with the oil return port of the first hydraulic valve group through the first hydraulic valve group, the A port of the first check valve is connected with the first pressure inlet of the first hydraulic valve group through the first hydraulic valve group, and the B port of the first check valve is connected with the first hydraulic valve group. The pressure valve group is connected with the first pressure outlet of the first hydraulic valve group, the A port of the second one-way valve is connected with the second pressure inlet of the first hydraulic valve group through the first hydraulic valve group, the B port of the second one-way valve is connected with the P port of the first electro-hydraulic reversing valve through the first hydraulic valve group, the A port of the first electro-hydraulic reversing valve is connected with the first pressure outlet of the first hydraulic valve group through the first hydraulic valve group, the B port of the first electro-hydraulic reversing valve is connected with the second pressure outlet of the first hydraulic valve group through the first hydraulic valve group, the second electro-hydraulic reversing valve is connected with the superimposed flow valve and the superimposed pressure reducing valve in a superimposed manner, the P port of the second electro-hydraulic reversing valve is connected with the first pressure outlet of the first hydraulic valve group through the first hydraulic valve group, and the B port of the second electro-hydraulic reversing valve is connected with the second pressure outlet of the first hydraulic valve group through the first hydraulic valve group.

[0010] Preferably, the first pressure port of the second hydraulic valve group is connected to the first pressure outlet of the first hydraulic valve group, the second pressure port of the second hydraulic valve group is connected to the high-pressure port of the plunger hydraulic pump motor, the P port of the mechanical hydraulic reversing valve is connected to the first pressure port of the second hydraulic valve group through the second hydraulic valve group, the B port of the mechanical hydraulic reversing valve is connected to the B port of the hydraulically controlled one-way valve and the A port of the third one-way valve through the second hydraulic valve group, the switch arm of the second hydraulic valve group is hingedly connected to the piston rod of the reversing control cylinder, and the reversing control The air inlet of the air control cylinder is connected to the C port of the pneumatic combination control valve, the A port of the hydraulically controlled one-way valve is connected to the second pressure port of the second hydraulic valve group through the second hydraulic valve group, the B port of the hydraulically controlled one-way valve is connected to the B port of the mechanical hydraulic reversing valve and the A port of the third one-way valve through the second hydraulic valve group, the A port of the third one-way valve is connected to the B port of the mechanical hydraulic reversing valve and the B port of the hydraulically controlled one-way valve through the second hydraulic valve group, and the B port of the third one-way valve is connected to the first pressure port of the second hydraulic valve group through the second hydraulic valve group.

[0011] Preferably, position I of the above-mentioned pneumatic combination control valve is an idle state with port P closed, position II of the pneumatic combination control valve is that port P and port A are connected, position III of the pneumatic combination control valve is that port P and ports A and C are all connected, and position IV of the pneumatic combination control valve is that port P and port B are connected.

[0012] Preferably, the above-mentioned computer control system includes a computer control unit, a first pressure relay, a second pressure relay, a third pressure relay, a first pressure transmitter, and a second pressure transmitter;

[0013] Among them, the computer control unit centrally controls the hydraulic system, the first pressure relay is connected to the C port of the pneumatic combination control valve, the second pressure relay is connected to the B port of the pneumatic combination control valve, the third pressure relay is connected to the A port of the pneumatic combination control valve, the first pressure transmitter is connected to the first hydraulic valve group, and is connected to the first pressure outlet of the first hydraulic valve group through the first hydraulic valve group, the second pressure transmitter is connected to the first hydraulic valve group, and is connected to the second pressure outlet of the first hydraulic valve group through the first hydraulic valve group.

[0014] Preferably, the above-mentioned computer control unit is respectively connected to the grid-powered motor, the first electromagnetic reversing valve, the second electromagnetic overflow valve, the first electro-hydraulic reversing valve, the second electro-hydraulic reversing valve, the hydraulically controlled one-way valve, the second electromagnetic reversing valve, the second pressure relay, and the third pressure relay through lines.

[0015] Preferably, the second hydraulic pump is a variable hydraulic pump, and the plunger hydraulic pump motor is a variable pump motor.

[0016] The method for using the hydraulic control system of the extended-range grid-electric workover rig mentioned in the present invention has the following technical solutions:

[0017] When only the extended-range diesel engine is used, the following process is included:

[0018] 1. During operation: the extended-range diesel engine drives the first hydraulic pump to rotate and work, the hydraulic oil enters the low-pressure port of the first hydraulic pump from the hydraulic oil tank, the hydraulic oil flows out from the high-pressure port of the first hydraulic pump, enters the first pressure inlet of the first hydraulic valve group, and then enters the A port of the first check valve to the B port of the first check valve, and enters the hydraulic energy storage station through the first pressure outlet of the first hydraulic valve group for storage; a first electromagnetic relief valve is connected between the high-pressure port of the first hydraulic pump and the A port of the first check valve, the first pressure transmitter detects the pressure value of the hydraulic energy storage station in real time, the computer control unit compares and calculates the data fed back by the first pressure transmitter with the set pressure data, and controls the power on and off of the first electromagnetic relief valve to keep the pressure value of the hydraulic energy storage station within the set range;

[0019] 2. Process of lifting the tubing rod: The operator first pushes the pneumatic combination control valve to position II, the P port of the pneumatic combination control valve is connected to the A port, the working drum clutch is engaged, and the pneumatic combination control valve is continued to be pushed to position III, the P port of the pneumatic combination control valve is also connected to the C port, the reversing control cylinder intakes air and pushes the valve core of the mechanical hydraulic reversing valve to move, so that the P port of the mechanical hydraulic reversing valve is connected to the B port. At the same time, since the P port of the pneumatic combination control valve is connected to the C port, the first pressure relay is energized, and the computer control unit controls the hydraulic control according to the information fed back by the first pressure relay. The one-way valve is energized and turned on, so that the B port to the A port of the hydraulic control one-way valve is turned on. At this time, the hydraulic oil flow is outputted from the hydraulic accumulator station and the first pressure outlet of the first hydraulic valve group at the same time, enters the first pressure port of the second hydraulic valve group, and then passes through the P port and the B port of the mechanical hydraulic reversing valve, enters the B port to the A port of the hydraulic control one-way valve, and finally flows out through the second pressure port of the second hydraulic valve group, enters the high-pressure oil port of the plunger hydraulic pump motor, drives the plunger hydraulic pump motor to rotate and do work, and then drives the gearbox, chain drive mechanism, and working drum to rotate, so as to realize the operation of lifting the oil pipe rod;

[0020] 3. Tightening and unfastening process: The operator pushes the pneumatic combination control valve to position IV, the P port of the pneumatic combination control valve is connected to the B port, the second pressure relay is energized, and the computer control unit controls the second electro-hydraulic reversing valve to be energized according to the information fed back by the second pressure relay, so that the P port to the B port of the second electro-hydraulic reversing valve is connected, and most of the oil flow provided by the first hydraulic pump continues to pass through the first pressure outlet of the first hydraulic valve group into the hydraulic energy storage station for storage; a small part of the oil flow provided by the first hydraulic pump passes through the second electro-hydraulic reversing valve, the flow limiting of the superimposed flow valve, and the pressure reduction of the superimposed pressure reducing valve, and flows out through the second pressure outlet of the first hydraulic valve group, and finally enters the oil inlet of the double valve group. At this time, the operator pushes the second manual reversing valve to supply oil to the power clamp motor to perform tightening or unfastening operations;

[0021] 4. Process of lowering the tubing rod: the operator pushes the pneumatic combination control valve to position II, the P port of the pneumatic combination control valve is connected to the A port, the working drum clutch is engaged, and the tubing rod string falls due to its own weight, driving the working drum to rotate, and then the chain transmission mechanism and the gearbox to rotate, and then driving the plunger hydraulic pump motor to rotate. At this time, the plunger hydraulic pump motor is in the working condition of a pump, and the hydraulic oil enters the low-pressure port of the plunger hydraulic pump motor from the hydraulic oil tank, and comes out from the high-pressure port of the plunger hydraulic pump motor, enters the second pressure port of the second hydraulic valve group, and then from the A port to the B port of the hydraulic control one-way valve, and then passes through the A port to the B port of the third one-way valve, and finally passes through the first pressure port of the second hydraulic valve group and enters the hydraulic energy storage station for storage, thereby realizing the energy recovery of the gravitational potential energy during the lowering process of the tubing rod string, and the recovered energy is used in the next operation of lifting the tubing rod.

[0022] The method for using the hydraulic control system of the extended-range grid-electric workover rig mentioned in the present invention has the following technical solutions:

[0023] When only grid-powered motors are used for operation, the following processes are included:

[0024] 1. During the operation: the grid-electric motor drives the second hydraulic pump to rotate and work, the hydraulic oil enters the low-pressure port of the second hydraulic pump from the hydraulic oil tank, the hydraulic oil flows out from the high-pressure port of the second hydraulic pump, enters the second pressure inlet of the first hydraulic valve group, then enters the A port of the second check valve to the B port of the second check valve, then enters the P port of the first electro-hydraulic reversing valve to the A port of the first electro-hydraulic reversing valve, and enters the hydraulic energy storage station through the first pressure outlet of the first hydraulic valve group for storage; a second electromagnetic relief valve is connected between the high-pressure port of the second hydraulic pump and the A port of the second check valve, the first pressure transmitter detects the pressure value of the hydraulic energy storage station in real time, the computer control unit compares and calculates the data fed back by the first pressure transmitter with the set pressure data, and controls the power on and off of the second electromagnetic relief valve to keep the pressure value of the hydraulic energy storage station within the set range;

[0025] 2. Process of lifting the tubing rod: The operator first pushes the pneumatic combination control valve to position II, the P port of the pneumatic combination control valve is connected to the A port, the working drum clutch is engaged, and the pneumatic combination control valve is continued to be pushed to position III, the P port of the pneumatic combination control valve is also connected to the C port, the reversing control cylinder intakes air and pushes the valve core of the mechanical hydraulic reversing valve to move, so that the P port of the mechanical hydraulic reversing valve is connected to the B port. At the same time, since the P port of the pneumatic combination control valve is connected to the C port, the first pressure relay is energized, and the computer control unit controls the hydraulic control according to the information fed back by the first pressure relay. The one-way valve is energized and turned on, so that the B port to the A port of the hydraulic control one-way valve is turned on. At this time, the hydraulic oil flow is outputted from the hydraulic accumulator station and the first pressure outlet of the first hydraulic valve group at the same time, enters the first pressure port of the second hydraulic valve group, and then passes through the P port and the B port of the mechanical hydraulic reversing valve, enters the B port to the A port of the hydraulic control one-way valve, and finally flows out through the second pressure port of the second hydraulic valve group, enters the high-pressure oil port of the plunger hydraulic pump motor, drives the plunger hydraulic pump motor to rotate and do work, and then drives the gearbox, chain drive mechanism, and working drum to rotate, so as to realize the operation of lifting the oil pipe rod;

[0026] 3. Tightening and unfastening process: the operator pushes the pneumatic combination control valve to position IV, the P port of the pneumatic combination control valve is connected to the B port, the second pressure relay is energized, and the computer control unit controls the first electro-hydraulic reversing valve to be energized according to the information fed back by the second pressure relay, so that the P port to the B port of the first electro-hydraulic reversing valve is connected, and the A port is closed, so that the pressure oil in the hydraulic accumulator station is preserved, and the hydraulic oil flowing out of the high-pressure port of the second hydraulic pump flows through the A port of the second check valve to the B port of the second check valve, and then enters the P port of the first electro-hydraulic reversing valve to the B port of the first electro-hydraulic reversing valve, and then flows out through the second pressure outlet of the first hydraulic valve group, and finally enters the oil inlet of the double valve group. At this time, the operator pushes the second manual reversing valve to supply oil to the power clamp motor to perform tightening or unfastening operations;

[0027] 4. Process of lowering the tubing rod: the operator pushes the pneumatic combination control valve to position II, the P port of the pneumatic combination control valve is connected to the A port, the working drum clutch is engaged, and the tubing rod string falls due to its own weight, driving the working drum to rotate, and then the chain transmission mechanism and the gearbox to rotate, and then driving the plunger hydraulic pump motor to rotate. At this time, the plunger hydraulic pump motor is in the working condition of a pump, and the hydraulic oil enters the low-pressure port of the plunger hydraulic pump motor from the hydraulic oil tank, and comes out from the high-pressure port of the plunger hydraulic pump motor, enters the second pressure port of the second hydraulic valve group, and then from the A port to the B port of the hydraulic control one-way valve, and then passes through the A port to the B port of the third one-way valve, and finally passes through the first pressure port of the second hydraulic valve group and enters the hydraulic energy storage station for storage, thereby realizing the energy recovery of the gravitational potential energy during the lowering process of the tubing rod string, and the recovered energy is used in the next operation of lifting the tubing rod.

[0028] The method for using the hydraulic control system of the extended-range grid-electric workover rig mentioned in the present invention has the following technical solutions:

[0029] When dual-power operation is used, the following process is included:

[0030] 1. During the operation: the range-extended diesel engine drives the first hydraulic pump to rotate and work, the hydraulic oil enters the low-pressure port of the first hydraulic pump from the hydraulic oil tank, the hydraulic oil flows out from the high-pressure port of the first hydraulic pump, enters the first pressure inlet of the first hydraulic valve group, and then enters the A port of the first check valve to the B port of the first check valve, and enters the hydraulic energy storage station through the first pressure outlet of the first hydraulic valve group for storage; the grid-electric motor drives the second hydraulic pump to rotate and work, the hydraulic oil enters the low-pressure port of the second hydraulic pump from the hydraulic oil tank, the hydraulic oil flows out from the high-pressure port of the second hydraulic pump, enters the second pressure inlet of the first hydraulic valve group, and then enters the A port of the second check valve to the B port of the second check valve, and then enters the P port of the first electro-hydraulic reversing valve to the A port of the first electro-hydraulic reversing valve, and enters the hydraulic energy storage station through the first pressure outlet of the first hydraulic valve group for storage;

[0031] A first electromagnetic overflow valve is connected between the high pressure port of the first hydraulic pump and the port A of the first one-way valve, and a second electromagnetic overflow valve is connected between the high pressure port of the second hydraulic pump and the port A of the second one-way valve;

[0032] The first pressure transmitter detects the pressure value of the hydraulic energy storage station in real time. The computer control unit compares and calculates the data fed back by the first pressure transmitter with the set pressure data, and controls the first electromagnetic relief valve and the second electromagnetic relief valve to be powered on and off, so that the pressure value of the hydraulic energy storage station is kept within the set range;

[0033] 2. Process of lifting the tubing rod: The operator first pushes the pneumatic combination control valve to position II, the P port of the pneumatic combination control valve is connected to the A port, the working drum clutch is engaged, and the pneumatic combination control valve is continued to be pushed to position III, the P port of the pneumatic combination control valve is also connected to the C port, the reversing control cylinder intakes air and pushes the valve core of the mechanical hydraulic reversing valve to move, so that the P port of the mechanical hydraulic reversing valve is connected to the B port. At the same time, since the P port of the pneumatic combination control valve is connected to the C port, the first pressure relay is energized, and the computer control unit controls the hydraulic control according to the information fed back by the first pressure relay. The one-way valve is energized and turned on, so that the B port to the A port of the hydraulic control one-way valve is turned on. At this time, the hydraulic oil flow is outputted from the hydraulic accumulator station and the first pressure outlet of the first hydraulic valve group at the same time, enters the first pressure port of the second hydraulic valve group, and then passes through the P port and the B port of the mechanical hydraulic reversing valve, enters the B port to the A port of the hydraulic control one-way valve, and finally flows out through the second pressure port of the second hydraulic valve group, enters the high-pressure oil port of the plunger hydraulic pump motor, drives the plunger hydraulic pump motor to rotate and do work, and then drives the gearbox, chain drive mechanism, and working drum to rotate, so as to realize the operation of lifting the oil pipe rod;

[0034] 3. Tightening and unfastening process: The operator pushes the pneumatic combination control valve to position IV, the P port of the pneumatic combination control valve is connected to the B port, the second pressure relay is energized, and the computer control unit controls the first electro-hydraulic reversing valve to be energized according to the information fed back by the second pressure relay, so that the P port to the B port of the first electro-hydraulic reversing valve is connected, and the A port is closed, so that the pressure oil in the hydraulic accumulator station is preserved, and the hydraulic oil flowing out of the high-pressure port of the second hydraulic pump flows through the A port of the second check valve to the B port of the second check valve, and then enters the P port of the first electro-hydraulic reversing valve to the B port of the first electro-hydraulic reversing valve, and then passes through the The oil flows out from the second pressure outlet of a hydraulic valve group and finally enters the oil inlet of the double valve group. At this time, the operator pushes the second manual reversing valve to supply oil to the power clamp motor for tightening or unfastening operations; at the same time, the extended-range diesel engine drives the first hydraulic pump to rotate and work, and the hydraulic oil enters the low-pressure port of the first hydraulic pump from the hydraulic oil tank. The hydraulic oil flows out from the high-pressure port of the first hydraulic pump and enters the first pressure inlet of the first hydraulic valve group, and then enters the A port of the first check valve to the B port of the first check valve, and enters the hydraulic energy storage station through the first pressure outlet of the first hydraulic valve group for storage;

[0035] 4. Process of lowering the tubing rod: the operator pushes the pneumatic combination control valve to position II, the P port of the pneumatic combination control valve is connected to the A port, the working drum clutch is engaged, and the tubing rod string falls due to its own weight, driving the working drum to rotate, and then the chain transmission mechanism and the gearbox to rotate, and then driving the plunger hydraulic pump motor to rotate. At this time, the plunger hydraulic pump motor is in the working condition of a pump, and the hydraulic oil enters the low-pressure port of the plunger hydraulic pump motor from the hydraulic oil tank, and comes out from the high-pressure port of the plunger hydraulic pump motor, enters the second pressure port of the second hydraulic valve group, and then from the A port to the B port of the hydraulic control one-way valve, and then passes through the A port to the B port of the third one-way valve, and finally passes through the first pressure port of the second hydraulic valve group and enters the hydraulic energy storage station for storage, thereby realizing the energy recovery of the gravitational potential energy during the lowering process of the tubing rod string, and the recovered energy is used in the next operation of lifting the tubing rod.

[0036] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0037] The high-pressure ports of the first hydraulic pump and the second hydraulic pump mentioned in the present invention are both connected to the first hydraulic valve group, so that the energy of the grid-electric motor and the diesel engine is collected to the energy storage station through the first hydraulic valve group; the high-pressure port of the plunger hydraulic pump motor is connected to the second hydraulic valve group, so that the gravitational potential energy of the pipe rod when it goes down is collected to the energy storage station through the second hydraulic valve group;

[0038] The second hydraulic valve group mentioned in the present invention is connected to the high-pressure port of the plunger hydraulic pump motor, so that the energy in the hydraulic energy storage station and the energy output by the first hydraulic pump and the second hydraulic pump are provided to the plunger hydraulic pump motor through the second hydraulic valve group to perform work to realize the lifting operation of the pipe rod;

[0039] The first hydraulic valve group mentioned in the present invention is connected to the oil inlet of the double valve group, so that a small part of the oil flow provided by the first hydraulic pump or the second hydraulic pump enters the double valve group after being reduced in pressure by the first hydraulic valve group, and is respectively provided to the power clamp motor, the hydraulic winch motor and the outrigger oil cylinder through the double valve group, so as to respectively realize the buckling and unbuckling operations, the hydraulic winch up and down operations, and the outrigger extension and retraction operations;

[0040] In summary, the present invention integrates different energy sources, specifically grid-electric motors, diesel engines, and pipe-rod gravitational potential energy, and aggregates them into a hydraulic accumulator; controls the output of hydraulic energy to different working units, such as a plunger-type hydraulic pump motor, a power clamp motor, a hydraulic winch motor, and an outrigger cylinder; and realizes different operations such as lifting, tightening and unfastening the pipe-rod, moving the hydraulic winch up and down, and extending and retracting the outriggers, making the present invention more energy-efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the principle of the hydraulic control system of the present invention;

[0042] Figure 2 It is a schematic diagram of the control system framework of the present invention;

[0043] Figure 3 is a structural schematic diagram of the first hydraulic valve group;

[0044] Figure 4 is a structural schematic diagram of the first hydraulic valve group in another direction;

[0045] Figure 5 is a structural schematic diagram of the second hydraulic valve group;

[0046] Figure 6 It is a structural schematic diagram of the second hydraulic valve group in another direction;

[0047] Figure 7 is a schematic diagram of the internal oil circuit of the first hydraulic valve group;

[0048] Figure 8 This is a schematic diagram of the internal oil circuit of the first hydraulic valve group in the other direction;

[0049] Fig. 9 It is a schematic diagram of the internal oil circuit of the second hydraulic valve group;

[0050] Fig.10 This is a schematic diagram of the internal oil circuit of the second hydraulic valve group in the other direction;

[0051] In the figure above: the first hydraulic pump 1, the extended-range diesel engine 101, the second hydraulic pump 2, the grid-electric motor 201, the first electromagnetic reversing valve 202, the first hydraulic valve group 3, the first electromagnetic overflow valve 301, the second electromagnetic overflow valve 302, the first check valve 303, the second check valve 304, the first electro-hydraulic reversing valve 305, the second electro-hydraulic reversing valve 306, the superimposed flow valve 307, the superimposed pressure reducing valve 308, the second hydraulic valve group 4, the mechanical hydraulic reversing valve 401, the reversing control cylinder 402, the hydraulically controlled check valve 403, the third check valve 404, the double valve group 5, the first manual reversing valve 501, the second manual reversing valve 502, the relief valve 503, the plunger hydraulic pump motor 6, the second electromagnetic reversing valve 601, hydraulic energy storage station 7, computer control system 8, computer control unit 801, first pressure relay 802, second pressure relay 803, third pressure relay 804, first pressure transmitter 805, second pressure transmitter 806, pneumatic combination control valve 9, hydraulic oil tank 10, gearbox 11, chain transmission mechanism 12, working drum 13, working drum clutch 14, outrigger cylinder 15, power clamp motor 16, hydraulic winch 17, air source 18, first pressure inlet 309.1, second pressure inlet 309.2, first pressure outlet 309.3, second pressure outlet 309.4, oil return port 309.5, first pressure port 405.1, second pressure port 405.2. DETAILED DESCRIPTION

[0052] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0053] Example 1, reference Figure 1-Figure 10 The hydraulic control system of a range-extended grid-electric workover rig mentioned in the present invention comprises a first hydraulic pump 1, a range-extended diesel engine 101, a second hydraulic pump 2, a grid-electric motor 201 and a computer control system 8, wherein the first hydraulic pump 1 is connected to the range-extended diesel engine 101, and the second hydraulic pump 2 is connected to the grid-electric motor 201, wherein the first electromagnetic reversing valve 202, a first hydraulic valve group 3, a second hydraulic valve group 4, a double valve group 5, a plunger hydraulic pump motor 6, a second electromagnetic reversing valve 601, a hydraulic energy storage station 7, a pneumatic combination control valve 9, and a hydraulic oil tank 10;

[0054] The first hydraulic valve group 3 includes a first electromagnetic overflow valve 301, a second electromagnetic overflow valve 302, a first non-return valve 303, a second non-return valve 304, a first electro-hydraulic reversing valve 305, a second electro-hydraulic reversing valve 306, a superimposed flow valve 307, and a superimposed pressure reducing valve 308; the first hydraulic valve group 3 has a first pressure inlet 309.1, a second pressure inlet 309.2, a first pressure outlet 309.3, a second pressure outlet 309.4, and an oil return port 309.5;

[0055] The second hydraulic valve group 4 includes a mechanical hydraulic reversing valve 401, a reversing control cylinder 402, a hydraulically controlled one-way valve 403, and a third one-way valve 404; the second hydraulic valve group 4 has a first pressure port 405.1 and a second pressure port 405.2;

[0056] The low-pressure port of the first hydraulic pump 1 is connected to the hydraulic oil tank 10, and the high-pressure port of the first hydraulic pump 1 is connected to the first pressure inlet 309.1 of the first hydraulic valve group 3; the displacement of the second hydraulic pump 2 is controlled by the connected first electromagnetic reversing valve 202, the low-pressure port of the second hydraulic pump 2 is connected to the hydraulic oil tank 10, and the high-pressure port of the second hydraulic pump 2 is connected to the second pressure inlet 309.2 of the first hydraulic valve group 3; the double valve group 5 includes a first manual reversing valve 501, a second manual reversing valve 502, and a relief valve 503, wherein the first manual reversing valve 501 controls the oil supply to the hydraulic winch 17, and the second manual reversing valve 502 controls the oil supply to the outrigger cylinder 15 and the power clamp motor 16; the plunger hydraulic pump motor 6 is connected to the gearbox 11 The displacement is controlled by the second electromagnetic reversing valve 601, the high-pressure port of the plunger hydraulic pump motor 6 is connected to the second pressure port 405.2 of the second hydraulic valve group 4, and the low-pressure port of the plunger hydraulic pump motor 6 is connected to the hydraulic oil tank 10; the hydraulic energy storage station 7 is composed of a number of hydraulic accumulators in parallel, and the lower oil port of the hydraulic energy storage station 7 is connected to the first pressure outlet 309.3 of the first hydraulic valve group 3 and the first pressure port 405.1 of the second hydraulic valve group 4; the P port of the pneumatic combination control valve 9 is connected to the air source 18, the A port is connected to the working roller clutch 14, the B port is connected to the second pressure relay 803 of the computer control system 8, and the C port is connected to the air inlet of the reversing control cylinder 402 and the first pressure relay 802 of the computer control system 8.

[0057] Reference Figure 3 and Figure 4The first pressure outlet 309.3 mentioned in the present invention is connected to the lower oil port of the hydraulic accumulator station 7 and the first pressure port 405.1 of the second hydraulic valve group 4, the second pressure outlet 309.4 is connected to the oil inlet of the double valve group 5, and the oil return port 309.5 is connected to the hydraulic oil tank 10; the A port of the first electromagnetic overflow valve 301 is connected to the first pressure inlet 309.1 of the first hydraulic valve group 3 through the first hydraulic valve group 3, and the B port of the first electromagnetic overflow valve 301 is connected to the first hydraulic valve group 3 through the first hydraulic valve group 3 The oil return port 309.5 of the first hydraulic valve group 3 is connected, the A port of the second electromagnetic overflow valve 302 is connected to the second pressure inlet 309.2 of the first hydraulic valve group 3 through the first hydraulic valve group 3, the B port of the second electromagnetic overflow valve 302 is connected to the oil return port 309.5 of the first hydraulic valve group 3 through the first hydraulic valve group 3, the A port of the first check valve 303 is connected to the first pressure inlet 309.1 of the first hydraulic valve group 3 through the first hydraulic valve group 3, and the B port of the first check valve 303 is connected to the oil return port 309.5 of the first hydraulic valve group 3 through the first hydraulic valve group 3. The first hydraulic valve group 3 is connected to the first pressure outlet 309.3 of the first hydraulic valve group 3, the A port of the second one-way valve 304 is connected to the second pressure inlet 309.2 of the first hydraulic valve group 3 through the first hydraulic valve group 3, the B port of the second one-way valve 304 is connected to the P port of the first electro-hydraulic reversing valve 305 through the first hydraulic valve group 3, the A port of the first electro-hydraulic reversing valve 305 is connected to the first pressure outlet 309.3 of the first hydraulic valve group 3 through the first hydraulic valve group 3, and the first electro-hydraulic reversing valve 305 is connected to the first pressure outlet 309.3 of the first hydraulic valve group 3. The B port of the valve 305 is connected to the second pressure outlet 309.4 of the first hydraulic valve group 3 through the first hydraulic valve group 3, the second electro-hydraulic reversing valve 306 is connected to the superimposed flow valve 307 and the superimposed pressure reducing valve 308 in a superimposed manner, the P port of the second electro-hydraulic reversing valve 306 is connected to the first pressure outlet 309.3 of the first hydraulic valve group 3 through the first hydraulic valve group 3, and the B port of the second electro-hydraulic reversing valve 306 is connected to the second pressure outlet 309.4 of the first hydraulic valve group 3 through the first hydraulic valve group 3.

[0058] Reference Figure 5 and Figure 6The first pressure port 405.1 of the second hydraulic valve group 4 mentioned in the present invention is connected to the first pressure outlet 309.3 of the first hydraulic valve group 3, the second pressure port 405.2 of the second hydraulic valve group 4 is connected to the high pressure port of the plunger hydraulic pump motor 6, the P port of the mechanical hydraulic reversing valve 401 is connected to the first pressure port 405.1 of the second hydraulic valve group 4 through the second hydraulic valve group 4, the B port of the mechanical hydraulic reversing valve 401 is connected to the B port of the hydraulically controlled one-way valve 403 and the A port of the third one-way valve 404 through the second hydraulic valve group 4, the switch arm of the second hydraulic valve group 4 is hingedly connected to the piston rod of the reversing control cylinder 402, and the reversing The air inlet of the control cylinder 402 is connected to the C port of the pneumatic combination control valve 9, the A port of the hydraulically controlled one-way valve 403 is connected to the second pressure port 405.2 of the second hydraulic valve group 4 through the second hydraulic valve group 4, the B port of the hydraulically controlled one-way valve 403 is connected to the B port of the mechanical hydraulic reversing valve 401 and the A port of the third one-way valve 404 through the second hydraulic valve group 4, the A port of the third one-way valve 404 is connected to the B port of the mechanical hydraulic reversing valve 401 and the B port of the hydraulically controlled one-way valve 403 through the second hydraulic valve group 4, and the B port of the third one-way valve 404 is connected to the first pressure port 405.1 of the second hydraulic valve group 4 through the second hydraulic valve group 4.

[0059] Position I of the pneumatic combination control valve 9 mentioned in the present invention is an idle state with port P closed, position II of the pneumatic combination control valve 9 is that port P is connected to port A, position III of the pneumatic combination control valve 9 is that port P is connected to port A and port C, and position IV of the pneumatic combination control valve 9 is that port P is connected to port B.

[0060] In addition, the computer control system 8 includes a computer control unit 801, a first pressure relay 802, a second pressure relay 803, a third pressure relay 804, a first pressure transmitter 805, and a second pressure transmitter 806;

[0061] Among them, the computer control unit 801 centrally controls the hydraulic system, the first pressure relay 802 is connected to the C port of the pneumatic combination control valve 9, the second pressure relay 803 is connected to the B port of the pneumatic combination control valve 9, the third pressure relay 804 is connected to the A port of the pneumatic combination control valve 9, the first pressure transmitter 805 is connected to the first hydraulic valve group 3, and is connected to the first pressure outlet 309.3 of the first hydraulic valve group 3 through the first hydraulic valve group 3, and the second pressure transmitter 806 is connected to the first hydraulic valve group 3, and is connected to the second pressure outlet 309.4 of the first hydraulic valve group 3 through the first hydraulic valve group 3.

[0062] The above-mentioned computer control unit 801 is respectively connected to the grid-powered motor 201, the first electromagnetic reversing valve 202, the second electromagnetic overflow valve 302, the first electro-hydraulic reversing valve 305, the second electro-hydraulic reversing valve 306, the hydraulically controlled one-way valve 403, the second electromagnetic reversing valve 601, the second pressure relay 803, and the third pressure relay 804 through lines.

[0063] In addition, it should be noted that the second hydraulic pump 2 mentioned above is a variable hydraulic pump, and the plunger hydraulic pump motor 6 is a variable pump motor.

[0064] The method of using the hydraulic control system of the extended-range grid-electric workover rig mentioned in the present invention is divided into three working conditions, one is to operate only with the extended-range diesel engine, the second is to operate only with the grid-electric motor, and the third is dual-power operation, which are described as follows:

[0065] When only the extended-range diesel engine is used, the following process is included:

[0066] 1. During operation: the extended-range diesel engine 101 drives the first hydraulic pump 1 to rotate and work, the hydraulic oil enters the low-pressure port of the first hydraulic pump 1 from the hydraulic oil tank 10, and the hydraulic oil flows out from the high-pressure port of the first hydraulic pump 1, enters the first pressure inlet 309.1 of the first hydraulic valve group 3, and then enters the A port of the first non-return valve 303 to the B port of the first non-return valve 303, and enters the hydraulic energy storage station 7 through the first pressure outlet 309.3 of the first hydraulic valve group 3 for storage; a first electromagnetic relief valve 301 is connected between the high-pressure port of the first hydraulic pump 1 and the A port of the first non-return valve 303, and the first pressure transmitter 805 detects the pressure value of the hydraulic energy storage station 7 in real time. The computer control unit 801 compares and calculates the data fed back by the first pressure transmitter 805 with the set pressure data, and controls the first electromagnetic relief valve 301 to be powered on and off, so that the pressure value of the hydraulic energy storage station 7 is kept within the set range;

[0067] 2. Process of lifting the tubing rod: the operator first pushes the pneumatic combination control valve 9 to position II, the P port of the pneumatic combination control valve 9 is connected to the A port, the working drum clutch 14 is engaged, and the pneumatic combination control valve 9 is continued to be pushed to position III, the P port of the pneumatic combination control valve 9 is also connected to the C port, the reversing control cylinder 402 is inhaled and pushes the valve core of the mechanical hydraulic reversing valve 401 to move, so that the P port of the mechanical hydraulic reversing valve 401 is connected to the B port, and at the same time, because the P port of the pneumatic combination control valve 9 is connected to the C port, the first pressure relay 802 is energized, and the computer control unit 801 controls the hydraulic control check valve 403 to pass according to the information fed back by the first pressure relay 802. The electric conduction makes the B port to the A port of the hydraulic control one-way valve 403 conduct. At this time, the hydraulic oil flow is outputted from the hydraulic energy storage station 7 and the first pressure outlet 309.3 of the first hydraulic valve group 3 at the same time, enters the first pressure port 405.1 of the second hydraulic valve group 4, and then passes through the P port and the B port of the mechanical hydraulic reversing valve 401, enters the B port to the A port of the hydraulic control one-way valve 403, and finally flows out through the second pressure port 405.2 of the second hydraulic valve group 4, enters the high-pressure oil port of the plunger hydraulic pump motor 6, and drives the plunger hydraulic pump motor 6 to rotate and do work, thereby driving the gearbox 11, the chain transmission mechanism 12, and the working drum 13 to rotate, so as to realize the operation of lifting the oil pipe rod;

[0068] 3. Tightening and unfastening process: the operator pushes the pneumatic combination control valve 9 to position IV, the P port of the pneumatic combination control valve 9 is connected to the B port, the second pressure relay 803 is energized, and the computer control unit 801 controls the second electro-hydraulic reversing valve 306 to be energized according to the information fed back by the second pressure relay 803, so that the P port to the B port of the second electro-hydraulic reversing valve 306 is connected, and most of the oil flow provided by the first hydraulic pump 1 continues to pass through the first pressure outlet 309.3 of the first hydraulic valve group 3 to enter the hydraulic energy storage station 7 for storage; a small part of the oil flow provided by the first hydraulic pump 1 passes through the second electro-hydraulic reversing valve 306, the flow limiting of the superimposed flow valve 307, and the pressure reduction of the superimposed pressure reducing valve 308, and flows out through the second pressure outlet 309.4 of the first hydraulic valve group 3, and finally enters the oil inlet of the double valve group 5. At this time, the operator pushes the second manual reversing valve 502 to supply oil to the power clamp motor 16 to perform the tightening or unfastening operation;

[0069] 4. Process of lowering the tubing rod: the operator pushes the pneumatic combination control valve 9 to position II, the P port of the pneumatic combination control valve 9 is connected to the A port, the working drum clutch 14 is engaged, and the tubing rod string falls due to its own weight, driving the working drum 13 to rotate, and then the chain transmission mechanism 12 and the gearbox 11 to rotate, and then driving the plunger hydraulic pump motor 6 to rotate. At this time, the plunger hydraulic pump motor 6 is in the working state of the pump, and the hydraulic oil enters the low-pressure port of the plunger hydraulic pump motor 6 from the hydraulic oil tank 10, and comes out from the high-pressure port of the plunger hydraulic pump motor 6, and enters the second pressure port 405.2 of the second hydraulic valve group 4, and then from the A port to the B port of the hydraulic control one-way valve 403, and then through the A port to the B port of the third one-way valve 404, and finally through the first pressure port 405.1 of the second hydraulic valve group 4, and enters the hydraulic energy storage station 7 for storage, thereby realizing the energy recovery of the gravitational potential energy in the process of lowering the tubing rod string, and the recovered energy is used in the next operation of lifting the tubing rod.

[0070] The method for using the hydraulic control system of the extended-range grid-electric workover rig mentioned in the present invention has the following technical solutions:

[0071] When only grid-powered motors are used for operation, the following processes are included:

[0072] 1. During the operation: the grid-electric motor 201 drives the second hydraulic pump 2 to rotate and work, the hydraulic oil enters the low-pressure port of the second hydraulic pump 2 from the hydraulic oil tank 10, and the hydraulic oil flows out from the high-pressure port of the second hydraulic pump 2, enters the second pressure inlet 309.2 of the first hydraulic valve group 3, and then enters the A port of the second non-return valve 304 to the B port of the second non-return valve 304, and then enters the P port of the first electro-hydraulic reversing valve 305 to the A port of the first electro-hydraulic reversing valve 305, and enters the hydraulic energy storage station 7 through the first pressure outlet 309.3 of the first hydraulic valve group 3 for storage; a second electromagnetic relief valve 302 is connected between the high-pressure port of the second hydraulic pump 2 and the A port of the second non-return valve 304, and the first pressure transmitter 805 detects the pressure value of the hydraulic energy storage station 7 in real time. The computer control unit 801 compares and calculates the data fed back by the first pressure transmitter 805 with the set pressure data, and controls the power on and off of the second electromagnetic relief valve 302 to keep the pressure value of the hydraulic energy storage station 7 within the set range;

[0073] 2. Process of lifting the tubing rod: the operator first pushes the pneumatic combination control valve 9 to position II, the P port of the pneumatic combination control valve 9 is connected to the A port, the working drum clutch 14 is engaged, and the pneumatic combination control valve 9 is continued to be pushed to position III, the P port of the pneumatic combination control valve 9 is also connected to the C port, the reversing control cylinder 402 is inhaled and pushes the valve core of the mechanical hydraulic reversing valve 401 to move, so that the P port of the mechanical hydraulic reversing valve 401 is connected to the B port, and at the same time, because the P port of the pneumatic combination control valve 9 is connected to the C port, the first pressure relay 802 is energized, and the computer control unit 801 controls the hydraulic control check valve 403 to pass according to the information fed back by the first pressure relay 802. The electric conduction makes the B port to the A port of the hydraulic control one-way valve 403 conduct. At this time, the hydraulic oil flow is outputted from the hydraulic energy storage station 7 and the first pressure outlet 309.3 of the first hydraulic valve group 3 at the same time, enters the first pressure port 405.1 of the second hydraulic valve group 4, and then passes through the P port and the B port of the mechanical hydraulic reversing valve 401, enters the B port to the A port of the hydraulic control one-way valve 403, and finally flows out through the second pressure port 405.2 of the second hydraulic valve group 4, enters the high-pressure oil port of the plunger hydraulic pump motor 6, and drives the plunger hydraulic pump motor 6 to rotate and do work, thereby driving the gearbox 11, the chain transmission mechanism 12, and the working drum 13 to rotate, so as to realize the operation of lifting the oil pipe rod;

[0074] 3. Tightening and unfastening process: the operator pushes the pneumatic combination control valve 9 to position IV, the P port of the pneumatic combination control valve 9 is connected to the B port, the second pressure relay 803 is energized, and the computer control unit 801 controls the first electro-hydraulic reversing valve 305 to be energized according to the information fed back by the second pressure relay 803, so that the P port to the B port of the first electro-hydraulic reversing valve 305 is connected, and the A port is closed, so that the pressure oil in the hydraulic energy storage station 7 is preserved, and the hydraulic oil flowing out of the high-pressure port of the second hydraulic pump 2 flows through the A port of the second check valve 304 to the B port of the second check valve 304, and then enters the P port of the first electro-hydraulic reversing valve 305 to the B port of the first electro-hydraulic reversing valve 305, and then flows out through the second pressure outlet 309.4 of the first hydraulic valve group 3, and finally enters the oil inlet of the double valve group 5. At this time, the operator pushes the second manual reversing valve 502 to supply oil to the power clamp motor 16 to perform tightening or unfastening operations;

[0075] 4. Process of lowering the tubing rod: the operator pushes the pneumatic combination control valve 9 to position II, the P port of the pneumatic combination control valve 9 is connected to the A port, the working drum clutch 14 is engaged, and the tubing rod string falls due to its own weight, driving the working drum 13 to rotate, and then the chain transmission mechanism 12 and the gearbox 11 to rotate, and then driving the plunger hydraulic pump motor 6 to rotate. At this time, the plunger hydraulic pump motor 6 is in the working state of the pump, and the hydraulic oil enters the low-pressure port of the plunger hydraulic pump motor 6 from the hydraulic oil tank 10, and comes out from the high-pressure port of the plunger hydraulic pump motor 6, and enters the second pressure port 405.2 of the second hydraulic valve group 4, and then from the A port to the B port of the hydraulic control one-way valve 403, and then through the A port to the B port of the third one-way valve 404, and finally through the first pressure port 405.1 of the second hydraulic valve group 4, and enters the hydraulic energy storage station 7 for storage, thereby realizing the energy recovery of the gravitational potential energy in the process of lowering the tubing rod string, and the recovered energy is used in the next operation of lifting the tubing rod.

[0076] The method for using the hydraulic control system of the extended-range grid-electric workover rig mentioned in the present invention has the following technical solutions:

[0077] When dual-power operation is used, the following process is included:

[0078] 1. During operation: the extended-range diesel engine 101 drives the first hydraulic pump 1 to rotate and work, the hydraulic oil enters the low-pressure port of the first hydraulic pump 1 from the hydraulic oil tank 10, the hydraulic oil flows out from the high-pressure port of the first hydraulic pump 1, enters the first pressure inlet 309.1 of the first hydraulic valve group 3, then enters the A port of the first check valve 303 to the B port of the first check valve 303, and enters the hydraulic energy storage station 7 through the first pressure outlet 309.3 of the first hydraulic valve group 3 for storage; the grid-electric motor 201 drives The second hydraulic pump 2 is driven to rotate and do work, and the hydraulic oil enters the low-pressure port of the second hydraulic pump 2 from the hydraulic oil tank, and the hydraulic oil flows out from the high-pressure port of the second hydraulic pump 2, enters the second pressure inlet 309.2 of the first hydraulic valve group 3, and then enters the A port of the second check valve 304 to the B port of the second check valve 304, and then enters the P port of the first electro-hydraulic reversing valve 305 to the A port of the first electro-hydraulic reversing valve 305, and enters the hydraulic energy storage station 7 through the first pressure outlet 309.3 of the first hydraulic valve group 3 for storage;

[0079] A first electromagnetic relief valve 301 is connected between the high pressure port of the first hydraulic pump 1 and the port A of the first check valve 303, and a second electromagnetic relief valve 302 is connected between the high pressure port of the second hydraulic pump 2 and the port A of the second check valve 304;

[0080] The first pressure transmitter 805 detects the pressure value of the hydraulic energy storage station 7 in real time, and the computer control unit 801 compares and calculates the data fed back by the first pressure transmitter 805 with the set pressure data, and controls the first electromagnetic relief valve 301 and the second electromagnetic relief valve 302 to be powered on and off, so that the pressure value of the hydraulic energy storage station 7 is kept within the set range;

[0081] 2. Process of lifting the tubing rod: the operator first pushes the pneumatic combination control valve 9 to position II, the P port of the pneumatic combination control valve 9 is connected to the A port, the working drum clutch 14 is engaged, and the pneumatic combination control valve 9 is continued to be pushed to position III, the P port of the pneumatic combination control valve 9 is also connected to the C port, the reversing control cylinder 402 is inhaled and pushes the valve core of the mechanical hydraulic reversing valve 401 to move, so that the P port of the mechanical hydraulic reversing valve 401 is connected to the B port, and at the same time, because the P port of the pneumatic combination control valve 9 is connected to the C port, the first pressure relay 802 is energized, and the computer control unit 801 controls the hydraulic control check valve 403 to pass according to the information fed back by the first pressure relay 802. The electric conduction makes the B port to the A port of the hydraulic control one-way valve 403 conduct. At this time, the hydraulic oil flow is outputted from the hydraulic energy storage station 7 and the first pressure outlet 309.3 of the first hydraulic valve group 3 at the same time, enters the first pressure port 405.1 of the second hydraulic valve group 4, and then passes through the P port and the B port of the mechanical hydraulic reversing valve 401, enters the B port to the A port of the hydraulic control one-way valve 403, and finally flows out through the second pressure port 405.2 of the second hydraulic valve group 4, enters the high-pressure oil port of the plunger hydraulic pump motor 6, and drives the plunger hydraulic pump motor 6 to rotate and do work, thereby driving the gearbox 11, the chain transmission mechanism 12, and the working drum 13 to rotate, so as to realize the operation of lifting the oil pipe rod;

[0082] 3. Tightening and unfastening process: The operator pushes the pneumatic combination control valve 9 to position IV, the P port of the pneumatic combination control valve 9 is connected to the B port, the second pressure relay 803 is energized, and the computer control unit 801 controls the first electro-hydraulic reversing valve 305 to be energized according to the information fed back by the second pressure relay 803, so that the P port to the B port of the first electro-hydraulic reversing valve 305 is connected, and the A port is closed, so that the pressure oil in the hydraulic accumulator station 7 is preserved, and the hydraulic oil flowing out of the high-pressure port of the second hydraulic pump 2 flows through the A port of the second check valve 304 to the B port of the second check valve 304, and then enters the P port of the first electro-hydraulic reversing valve 305 to the B port of the first electro-hydraulic reversing valve 305, and then passes through the first hydraulic The oil flows out from the second pressure outlet 309.4 of the valve group 3 and finally enters the oil inlet of the double valve group 5. At this time, the operator pushes the second manual reversing valve 502 to supply oil to the power tongs motor 16 for tightening or unfastening operations; at the same time, the extended-range diesel engine 101 drives the first hydraulic pump 1 to rotate and work, and the hydraulic oil enters the low-pressure port of the first hydraulic pump 1 from the hydraulic oil tank. The hydraulic oil flows out from the high-pressure port of the first hydraulic pump 1 and enters the first pressure inlet 309.1 of the first hydraulic valve group 3, and then enters the A port of the first check valve 303 to the B port of the first check valve 303, and enters the hydraulic energy storage station 7 through the first pressure outlet 309.3 of the first hydraulic valve group 3 for storage;

[0083] 4. Process of lowering the tubing rod: the operator pushes the pneumatic combination control valve 9 to position II, the P port of the pneumatic combination control valve 9 is connected to the A port, the working drum clutch 14 is engaged, and the tubing rod string falls due to its own weight, driving the working drum 13 to rotate, and then the chain transmission mechanism 12 and the gearbox 11 to rotate, and then driving the plunger hydraulic pump motor 6 to rotate. At this time, the plunger hydraulic pump motor 6 is in the working state of the pump, and the hydraulic oil enters the low-pressure port of the plunger hydraulic pump motor 6 from the hydraulic oil tank 10, and comes out from the high-pressure port of the plunger hydraulic pump motor 6, and enters the second pressure port 405.2 of the second hydraulic valve group 4, and then from the A port to the B port of the hydraulic control one-way valve 403, and then through the A port to the B port of the third one-way valve 404, and finally through the first pressure port 405.1 of the second hydraulic valve group 4, and enters the hydraulic energy storage station 7 for storage, thereby realizing the energy recovery of the gravitational potential energy in the process of lowering the tubing rod string, and the recovered energy is used in the next operation of lifting the tubing rod.

[0084] The above are only some preferred embodiments of the present invention. Any person skilled in the art may modify the above technical solutions or modify them into equivalent technical solutions. Therefore, the corresponding simple modifications or equivalent transformations made according to the technical solutions of the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A hydraulic control system for an extended-range grid-electric workover rig, comprising a first hydraulic pump (1), an extended-range diesel engine (101), a second hydraulic pump (2), a grid-electric motor (201) and a computer control system (8), wherein the first hydraulic pump (1) is connected to the extended-range diesel engine (101), and the second hydraulic pump (2) is connected to the grid-electric motor (201), and wherein: It also includes a first electromagnetic reversing valve (202), a first hydraulic valve group (3), a second hydraulic valve group (4), a double valve group (5), a plunger hydraulic pump motor (6), a second electromagnetic reversing valve (601), a hydraulic energy storage station (7), a pneumatic combination control valve (9), and a hydraulic oil tank (10); The first hydraulic valve group (3) comprises a first electromagnetic overflow valve (301), a second electromagnetic overflow valve (302), a first non-return valve (303), a second non-return valve (304), a first electro-hydraulic reversing valve (305), a second electro-hydraulic reversing valve (306), a superimposed flow valve (307), and a superimposed pressure reducing valve (308); the first hydraulic valve group (3) is provided with a first pressure inlet (309.1), a second pressure inlet (309.2), a first pressure outlet (309.3), a second pressure outlet (309.4), and an oil return port (309.5); The second hydraulic valve group (4) comprises a mechanical hydraulic reversing valve (401), a reversing control cylinder (402), a hydraulically controlled one-way valve (403), and a third one-way valve (404); the second hydraulic valve group (4) is provided with a first pressure port (405.1) and a second pressure port (405.2); The low-pressure port of the first hydraulic pump (1) is connected to the hydraulic oil tank (10), and the high-pressure port of the first hydraulic pump (1) is connected to the first pressure inlet (309.1) of the first hydraulic valve group (3); the displacement of the second hydraulic pump (2) is controlled by the connected first electromagnetic reversing valve (202), the low-pressure port of the second hydraulic pump (2) is connected to the hydraulic oil tank (10), and the high-pressure port of the second hydraulic pump (2) is connected to the second pressure inlet (309.2) of the first hydraulic valve group (3); the double valve group (5) comprises a first manual reversing valve (501), a second manual reversing valve (502), and a relief valve (503), wherein the first manual reversing valve (501) controls the oil supply to the hydraulic winch (17), and the second manual reversing valve (502) controls the oil supply to the outrigger cylinder (15) and the power clamp motor (16); the plunger hydraulic pump motor (6) is connected to the gearbox (1 1), the displacement is controlled by the second electromagnetic reversing valve (601), the high pressure port of the plunger hydraulic pump motor (6) is connected to the second pressure port (405.2) of the second hydraulic valve group (4), and the low pressure port of the plunger hydraulic pump motor (6) is connected to the hydraulic oil tank (10); the hydraulic energy storage station (7) is composed of a plurality of hydraulic accumulators connected in parallel, the lower oil port of the hydraulic energy storage station (7) is connected to the first pressure outlet (309.3) of the first hydraulic valve group (3) and the first pressure port (405.1) of the second hydraulic valve group (4); the P port of the pneumatic combined control valve (9) is connected to the air source (18), the A port is connected to the working roller clutch (14), the B port is connected to the second pressure relay (803) of the computer control system (8), and the C port is connected to the air inlet of the reversing control cylinder (402) and the first pressure relay (802) of the computer control system (8).

2. The hydraulic control system of the extended-range grid-electric workover rig according to claim 1 is characterized by: The first pressure outlet (309.3) is connected to the lower oil port of the hydraulic energy storage station (7) and the first pressure port (405.1) of the second hydraulic valve group (4), the second pressure outlet (309.4) is connected to the oil inlet of the double valve group (5), and the oil return port (309.5) is connected to the hydraulic oil tank (10); the port A of the first electromagnetic overflow valve (301) is connected to the first pressure inlet (309.1) of the first hydraulic valve group (3) through the first hydraulic valve group (3), and the port B of the first electromagnetic overflow valve (301) is connected to the first hydraulic valve group (3) through the first hydraulic valve group (3). The oil return port (309.5) of the first hydraulic valve group (3) is connected, the A port of the second electromagnetic overflow valve (302) is connected to the second pressure inlet (309.2) of the first hydraulic valve group (3) through the first hydraulic valve group (3), the B port of the second electromagnetic overflow valve (302) is connected to the oil return port (309.5) of the first hydraulic valve group (3) through the first hydraulic valve group (3), the A port of the first check valve (303) is connected to the first pressure inlet (309.1) of the first hydraulic valve group (3) through the first hydraulic valve group (3), and the B port of the first check valve (303) is connected to the first pressure inlet (309.1) of the first hydraulic valve group (3) through the first The hydraulic valve group (3) is connected to the first pressure outlet (309.3) of the first hydraulic valve group (3); the A port of the second one-way valve (304) is connected to the second pressure inlet (309.2) of the first hydraulic valve group (3) through the first hydraulic valve group (3); the B port of the second one-way valve (304) is connected to the P port of the first electro-hydraulic reversing valve (305) through the first hydraulic valve group (3); the A port of the first electro-hydraulic reversing valve (305) is connected to the first pressure outlet (309.3) of the first hydraulic valve group (3) through the first hydraulic valve group (3); the first electro-hydraulic reversing valve ( The B port of the second electro-hydraulic reversing valve (305) is connected to the second pressure outlet (309.4) of the first hydraulic valve group (3) through the first hydraulic valve group (3); the second electro-hydraulic reversing valve (306) is connected to the superimposed flow valve (307) and the superimposed pressure reducing valve (308) in a superimposed manner; the P port of the second electro-hydraulic reversing valve (306) is connected to the first pressure outlet (309.3) of the first hydraulic valve group (3) through the first hydraulic valve group (3); and the B port of the second electro-hydraulic reversing valve (306) is connected to the second pressure outlet (309.4) of the first hydraulic valve group (3) through the first hydraulic valve group (3).

3. The hydraulic control system of the extended-range grid-electric workover rig according to claim 2 is characterized by: The first pressure port (405.1) of the second hydraulic valve group (4) is connected to the first pressure outlet (309.3) of the first hydraulic valve group (3); the second pressure port (405.2) of the second hydraulic valve group (4) is connected to the high pressure port of the plunger hydraulic pump motor (6); the P port of the mechanical hydraulic reversing valve (401) is connected to the first pressure port (405.1) of the second hydraulic valve group (4) through the second hydraulic valve group (4); the B port of the mechanical hydraulic reversing valve (401) is connected to the B port of the hydraulically controlled one-way valve (403) and the A port of the third one-way valve (404) through the second hydraulic valve group (4); the switch arm of the second hydraulic valve group (4) is hingedly connected to the piston rod of the reversing control cylinder (402); the reversing control cylinder (402) is connected to the first pressure port (405.1) of ... second pressure port (405.2) of the second hydraulic valve group (4) is connected to the first pressure port (405.1) of the second hydraulic valve group (4); the second pressure port (405.1) of the second hydraulic valve group (4) is connected to the first pressure port (405.1) of the second hydraulic valve group (4); the second pressure port (405.1) of the second hydraulic valve group (4) is connected to the first pressure port (405.1) of the second hydraulic valve group ( The air inlet of (402) is connected to the C port of the pneumatic combination control valve (9); the A port of the hydraulically controlled one-way valve (403) is connected to the second pressure port (405.2) of the second hydraulic valve group (4); the B port of the hydraulically controlled one-way valve (403) is connected to the B port of the mechanical hydraulic reversing valve (401) and the A port of the third one-way valve (404) through the second hydraulic valve group (4); the A port of the third one-way valve (404) is connected to the B port of the mechanical hydraulic reversing valve (401) and the B port of the hydraulically controlled one-way valve (403) through the second hydraulic valve group (4); and the B port of the third one-way valve (404) is connected to the first pressure port (405.1) of the second hydraulic valve group (4) through the second hydraulic valve group (4).

4. The hydraulic control system of the extended-range grid-electric workover rig according to claim 3 is characterized by: Position I of the pneumatic combination control valve (9) is an idle state in which the P port is closed; position II of the pneumatic combination control valve (9) is in which the P port is connected to the A port; position III of the pneumatic combination control valve (9) is in which the P port is connected to both the A port and the C port; and position IV of the pneumatic combination control valve (9) is in which the P port is connected to the B port.

5. The hydraulic control system of the extended-range grid-electric workover rig according to claim 4 is characterized by: The computer control system (8) comprises a computer control unit (801), a first pressure relay (802), a second pressure relay (803), a third pressure relay (804), a first pressure transmitter (805), and a second pressure transmitter (806); The computer control unit (801) performs centralized control of the hydraulic system, the first pressure relay (802) is connected to the C port of the pneumatic combination control valve (9), the second pressure relay (803) is connected to the B port of the pneumatic combination control valve (9), the third pressure relay (804) is connected to the A port of the pneumatic combination control valve (9), the first pressure transmitter (805) is connected to the first hydraulic valve group (3), and is connected to the first pressure outlet (309.3) of the first hydraulic valve group (3) through the first hydraulic valve group (3), and the second pressure transmitter (806) is connected to the first hydraulic valve group (3), and is connected to the second pressure outlet (309.4) of the first hydraulic valve group (3) through the first hydraulic valve group (3).

6. The hydraulic control system of the extended-range grid-electric workover rig according to claim 5 is characterized by: The computer control unit (801) is respectively connected to the grid-electric motor (201), the first electromagnetic reversing valve (202), the second electromagnetic overflow valve (302), the first electro-hydraulic reversing valve (305), the second electro-hydraulic reversing valve (306), the hydraulically controlled one-way valve (403), the second electromagnetic reversing valve (601), the second pressure relay (803), and the third pressure relay (804) through lines.

7. The hydraulic control system of the extended-range grid-electric workover rig according to claim 6 is characterized by: The second hydraulic pump (2) is a variable hydraulic pump, and the plunger hydraulic pump motor (6) is a variable pump motor.

8. The method for using the hydraulic control system of the extended-range grid-electric workover rig according to claim 7 is characterized in that: When only the extended-range diesel engine is used, the following process is included:

1. During operation: the range-extended diesel engine (101) drives the first hydraulic pump (1) to rotate and perform work, the hydraulic oil enters the low-pressure port of the first hydraulic pump (1) from the hydraulic oil tank (10), the hydraulic oil flows out from the high-pressure port of the first hydraulic pump (1), enters the first pressure inlet (309.1) of the first hydraulic valve group (3), then enters the A port of the first check valve (303) to the B port of the first check valve (303), and enters the hydraulic oil through the first pressure outlet (309.3) of the first hydraulic valve group (3). The hydraulic pressure is stored in the hydraulic energy storage station (7); a first electromagnetic overflow valve (301) is connected between the high pressure port of the first hydraulic pump (1) and the port A of the first non-return valve (303); a first pressure transmitter (805) detects the pressure value of the hydraulic energy storage station (7) in real time; a computer control unit (801) compares and calculates the data fed back by the first pressure transmitter (805) with the set pressure data, and controls the first electromagnetic overflow valve (301) to be powered on and off, so that the pressure value of the hydraulic energy storage station (7) is maintained within a set range; 2. Process of lifting the tubing rod: the operator first pushes the pneumatic combination control valve (9) to position II, the P port of the pneumatic combination control valve (9) is connected to the A port, the working drum clutch (14) is engaged, and the pneumatic combination control valve (9) is further pushed to position III, the P port of the pneumatic combination control valve (9) is also connected to the C port, the reversing control cylinder (402) is inhaled and pushes the valve core of the mechanical hydraulic reversing valve (401) to move, so that the P port of the mechanical hydraulic reversing valve (401) is connected to the B port. At the same time, because the P port of the pneumatic combination control valve (9) is connected to the C port, the first pressure relay (802) is energized, and the computer control unit (801) controls the hydraulic control check valve (403) to be energized according to the information fed back by the first pressure relay (802). The hydraulic oil flow is then simultaneously output from the hydraulic energy storage station (7) and the first pressure outlet (309.3) of the first hydraulic valve group (3) to the first pressure outlet (405.1) of the second hydraulic valve group (4), and then passes through the P and B ports of the mechanical hydraulic reversing valve (401), and then enters the B port to the A port of the hydraulic control check valve (403), and finally flows out through the second pressure port (405.2) of the second hydraulic valve group (4), and enters the high-pressure oil port of the plunger hydraulic pump motor (6), thereby driving the plunger hydraulic pump motor (6) to rotate and perform work, thereby driving the gearbox (11), the chain transmission mechanism (12), and the working drum (13) to rotate, thereby realizing the operation of lifting the oil pipe rod; 3. Tightening and unfastening process: The operator pushes the pneumatic combination control valve (9) to position IV, the P port of the pneumatic combination control valve (9) is connected to the B port, the second pressure relay (803) is energized, and the computer control unit (801) controls the second electro-hydraulic reversing valve (306) to be energized according to the information fed back by the second pressure relay (803), so that the P port of the second electro-hydraulic reversing valve (306) is connected to the B port, and most of the oil flow provided by the first hydraulic pump (1) continues to pass through the first pressure outlet of the first hydraulic valve group (3). (309.3) enters the hydraulic energy storage station (7) for storage; a small portion of the oil flow provided by the first hydraulic pump (1) passes through the second electro-hydraulic reversing valve (306), the flow limiting of the superimposed flow valve (307), the pressure reducing of the superimposed pressure reducing valve (308), flows out through the second pressure outlet (309.4) of the first hydraulic valve group (3), and finally enters the oil inlet of the double valve group (5). At this time, the operator pushes the second manual reversing valve (502) to supply oil to the power clamp motor (16) to perform the tightening or unfastening operation; 4. Process of lowering the oil pipe rod: the operator pushes the pneumatic combination control valve (9) to position II, the P port of the pneumatic combination control valve (9) is connected to the A port, the working drum clutch (14) is engaged, and the oil pipe rod string falls due to its own weight, driving the working drum (13) to rotate, and then the chain transmission mechanism (12) and the gearbox (11) to rotate, and then driving the plunger hydraulic pump motor (6) to rotate. At this time, the plunger hydraulic pump motor (6) is in the working state of a pump, and the hydraulic oil enters the low-pressure port of the plunger hydraulic pump motor (6) from the hydraulic oil tank (10). After coming out from the high-pressure port of the plunger hydraulic pump motor (6), it enters the second pressure port (405.2) of the second hydraulic valve group (4), then passes through the A port to the B port of the hydraulically controlled one-way valve (403), then passes through the A port to the B port of the third one-way valve (404), and finally passes through the first pressure port (405.1) of the second hydraulic valve group (4) to enter the hydraulic energy storage station (7) for storage, thereby realizing energy recovery of the gravitational potential energy during the lowering process of the tubing rod string, and the recovered energy is used in the next operation of lifting the tubing rod.

9. The method for using the hydraulic control system of the extended-range grid-electric workover rig according to claim 7 is characterized in that: When only grid-powered motors are used for operation, the following processes are included:

1. During the operation: the grid-electric motor (201) drives the second hydraulic pump (2) to rotate and perform work, the hydraulic oil enters the low-pressure port of the second hydraulic pump (2) from the hydraulic oil tank (10), the hydraulic oil flows out from the high-pressure port of the second hydraulic pump (2), enters the second pressure inlet (309.2) of the first hydraulic valve group (3), then enters the A port of the second check valve (304) to the B port of the second check valve (304), then enters the P port of the first electro-hydraulic reversing valve (305) to the A port of the first electro-hydraulic reversing valve (305), and passes through the first hydraulic valve group (3). The first pressure outlet (309.3) enters the hydraulic energy storage station (7) for storage; a second electromagnetic overflow valve (302) is connected between the high pressure port of the second hydraulic pump (2) and the port A of the second one-way valve (304); the first pressure transmitter (805) detects the pressure value of the hydraulic energy storage station (7) in real time; the computer control unit (801) compares and calculates the data fed back by the first pressure transmitter (805) with the set pressure data, and controls the second electromagnetic overflow valve (302) to be powered on and off, so that the pressure value of the hydraulic energy storage station (7) is maintained within the set range; 2. Process of lifting the tubing rod: the operator first pushes the pneumatic combination control valve (9) to position II, the P port of the pneumatic combination control valve (9) is connected to the A port, the working drum clutch (14) is engaged, and the pneumatic combination control valve (9) is further pushed to position III, the P port of the pneumatic combination control valve (9) is also connected to the C port, the reversing control cylinder (402) is inhaled and pushes the valve core of the mechanical hydraulic reversing valve (401) to move, so that the P port of the mechanical hydraulic reversing valve (401) is connected to the B port. At the same time, because the P port of the pneumatic combination control valve (9) is connected to the C port, the first pressure relay (802) is energized, and the computer control unit (801) controls the hydraulic control check valve (403) to be energized according to the information fed back by the first pressure relay (802). The hydraulic oil flow is then simultaneously output from the hydraulic energy storage station (7) and the first pressure outlet (309.3) of the first hydraulic valve group (3) to the first pressure outlet (405.1) of the second hydraulic valve group (4), and then passes through the P and B ports of the mechanical hydraulic reversing valve (401), and then enters the B port to the A port of the hydraulic control check valve (403), and finally flows out through the second pressure port (405.2) of the second hydraulic valve group (4), and enters the high-pressure oil port of the plunger hydraulic pump motor (6), thereby driving the plunger hydraulic pump motor (6) to rotate and perform work, thereby driving the gearbox (11), the chain transmission mechanism (12), and the working drum (13) to rotate, thereby realizing the operation of lifting the oil pipe rod; 3. Tightening and unfastening process: The operator pushes the pneumatic combination control valve (9) to position IV, the P port of the pneumatic combination control valve (9) is connected to the B port, the second pressure relay (803) is energized, and the computer control unit (801) controls the first electro-hydraulic reversing valve (305) to be energized according to the information fed back by the second pressure relay (803), so that the P port of the first electro-hydraulic reversing valve (305) is connected to the B port, and the A port is closed, so that the pressure oil in the hydraulic accumulator station (7) is preserved, and the second hydraulic pump (2) The hydraulic oil flowing out of the high-pressure port passes through the A port of the second one-way valve (304) to the B port of the second one-way valve (304), then enters the P port of the first electro-hydraulic reversing valve (305) to the B port of the first electro-hydraulic reversing valve (305), then flows out through the second pressure outlet (309.4) of the first hydraulic valve group (3), and finally enters the oil inlet of the double valve group (5). At this time, the operator pushes the second manual reversing valve (502) to supply oil to the power tongs motor (16) to perform tightening or unclipping operations; 4. Process of lowering the oil pipe rod: the operator pushes the pneumatic combination control valve (9) to position II, the P port of the pneumatic combination control valve (9) is connected to the A port, the working drum clutch (14) is engaged, and the oil pipe rod string falls due to its own weight, driving the working drum (13) to rotate, and then the chain transmission mechanism (12) and the gearbox (11) to rotate, and then driving the plunger hydraulic pump motor (6) to rotate. At this time, the plunger hydraulic pump motor (6) is in the working state of a pump, and the hydraulic oil enters the low-pressure port of the plunger hydraulic pump motor (6) from the hydraulic oil tank (10). After coming out from the high-pressure port of the plunger hydraulic pump motor (6), it enters the second pressure port (405.2) of the second hydraulic valve group (4), then passes through the A port to the B port of the hydraulically controlled one-way valve (403), then passes through the A port to the B port of the third one-way valve (404), and finally passes through the first pressure port (405.1) of the second hydraulic valve group (4) to enter the hydraulic energy storage station (7) for storage, thereby realizing energy recovery of the gravitational potential energy during the lowering process of the tubing rod string, and the recovered energy is used in the next operation of lifting the tubing rod.

10. The method for using the hydraulic control system of the extended-range grid-electric workover rig according to claim 7, characterized in that: When dual-power operation is adopted, the following process is included:

1. During operation: the range-extended diesel engine (101) drives the first hydraulic pump (1) to rotate and perform work, the hydraulic oil enters the low-pressure port of the first hydraulic pump (1) from the hydraulic oil tank (10), the hydraulic oil flows out from the high-pressure port of the first hydraulic pump (1), enters the first pressure inlet (309.1) of the first hydraulic valve group (3), then enters the A port of the first check valve (303) to the B port of the first check valve (303), and enters the hydraulic energy storage station (7) through the first pressure outlet (309.3) of the first hydraulic valve group (3) for storage; the grid-electric motor (201) The second hydraulic pump (2) is driven to rotate and perform work, and the hydraulic oil enters the low-pressure port of the second hydraulic pump (2) from the hydraulic oil tank, and the hydraulic oil flows out from the high-pressure port of the second hydraulic pump (2), enters the second pressure inlet (309.2) of the first hydraulic valve group (3), then enters the A port of the second check valve (304) to the B port of the second check valve (304), then enters the P port of the first electro-hydraulic reversing valve (305) to the A port of the first electro-hydraulic reversing valve (305), and enters the hydraulic energy storage station (7) for storage through the first pressure outlet (309.3) of the first hydraulic valve group (3); A first electromagnetic overflow valve (301) is connected between the high-pressure port of the first hydraulic pump (1) and the port A of the first non-return valve (303), and a second electromagnetic overflow valve (302) is connected between the high-pressure port of the second hydraulic pump (2) and the port A of the second non-return valve (304); The first pressure transmitter (805) detects the pressure value of the hydraulic energy storage station (7) in real time, and the computer control unit (801) compares and calculates the data fed back by the first pressure transmitter (805) with the set pressure data, and controls the first electromagnetic overflow valve (301) and the second electromagnetic overflow valve (302) to be energized or de-energized, so that the pressure value of the hydraulic energy storage station (7) is maintained within the set range; 2. Process of lifting the tubing rod: the operator first pushes the pneumatic combination control valve (9) to position II, the P port of the pneumatic combination control valve (9) is connected to the A port, the working drum clutch (14) is engaged, and the pneumatic combination control valve (9) is further pushed to position III, the P port of the pneumatic combination control valve (9) is also connected to the C port, the reversing control cylinder (402) is inhaled and pushes the valve core of the mechanical hydraulic reversing valve (401) to move, so that the P port of the mechanical hydraulic reversing valve (401) is connected to the B port. At the same time, because the P port of the pneumatic combination control valve (9) is connected to the C port, the first pressure relay (802) is energized, and the computer control unit (801) controls the hydraulic control check valve (403) to be energized according to the information fed back by the first pressure relay (802). The hydraulic oil flow is then simultaneously output from the hydraulic energy storage station (7) and the first pressure outlet (309.3) of the first hydraulic valve group (3) to the first pressure outlet (405.1) of the second hydraulic valve group (4), and then passes through the P and B ports of the mechanical hydraulic reversing valve (401), and then enters the B port to the A port of the hydraulic control check valve (403), and finally flows out through the second pressure port (405.2) of the second hydraulic valve group (4), and enters the high-pressure oil port of the plunger hydraulic pump motor (6), thereby driving the plunger hydraulic pump motor (6) to rotate and perform work, thereby driving the gearbox (11), the chain transmission mechanism (12), and the working drum (13) to rotate, thereby realizing the operation of lifting the oil pipe rod; 3. Tightening and unfastening process: The operator pushes the pneumatic combination control valve (9) to position IV, the P port and the B port of the pneumatic combination control valve (9) are connected, the second pressure relay (803) is energized, and the computer control unit (801) controls the first electro-hydraulic reversing valve (305) to be energized according to the information fed back by the second pressure relay (803), so that the P port and the B port of the first electro-hydraulic reversing valve (305) are connected, and the A port is closed, so that the pressure oil in the hydraulic accumulator station (7) is preserved, and the hydraulic oil flowing out of the high-pressure port of the second hydraulic pump (2) flows through the A port of the second check valve (304) to the B port of the second check valve (304), and then enters the P port of the first electro-hydraulic reversing valve (305) to the B port of the first electro-hydraulic reversing valve (305), and then passes through the first hydraulic valve group ( 3) and finally enters the oil inlet of the double valve group (5). At this time, the operator pushes the second manual reversing valve (502) to supply oil to the power clamp motor (16) to perform a tightening or unfastening operation. At the same time, the extended-range diesel engine (101) drives the first hydraulic pump (1) to rotate and perform work. The hydraulic oil enters the low-pressure port of the first hydraulic pump (1) from the hydraulic oil tank. The hydraulic oil flows out from the high-pressure port of the first hydraulic pump (1) and enters the first pressure inlet (309.1) of the first hydraulic valve group (3). Then, the hydraulic oil enters the A port of the first check valve (303) to the B port of the first check valve (303), and enters the hydraulic energy storage station (7) for storage through the first pressure outlet (309.3) of the first hydraulic valve group (3).

4. Process of lowering the oil pipe rod: the operator pushes the pneumatic combination control valve (9) to position II, the P port of the pneumatic combination control valve (9) is connected to the A port, the working drum clutch (14) is engaged, and the oil pipe rod string falls due to its own weight, driving the working drum (13) to rotate, and then the chain transmission mechanism (12) and the gearbox (11) to rotate, and then driving the plunger hydraulic pump motor (6) to rotate. At this time, the plunger hydraulic pump motor (6) is in the working state of a pump, and the hydraulic oil enters the low-pressure port of the plunger hydraulic pump motor (6) from the hydraulic oil tank (10). After coming out from the high-pressure port of the plunger hydraulic pump motor (6), it enters the second pressure port (405.2) of the second hydraulic valve group (4), then passes through the A port to the B port of the hydraulically controlled one-way valve (403), then passes through the A port to the B port of the third one-way valve (404), and finally passes through the first pressure port (405.1) of the second hydraulic valve group (4) to enter the hydraulic energy storage station (7) for storage, thereby realizing energy recovery of the gravitational potential energy during the lowering process of the tubing rod string, and the recovered energy is used in the next operation of lifting the tubing rod.

Images