A CNC hydraulic pumping system

Abstract

This invention relates to the field of oilfield equipment technology, specifically to a CNC hydraulic pumping system, comprising a hydraulic power unit and a hydraulic lifting unit. The hydraulic power unit includes a prime mover, a main pump, a hydraulic oil preheating and cooling system, a hydraulic reversing system, and a hydraulic oil tank system. The hydraulic lifting unit includes a hydraulic cylinder. The hydraulic oil preheating and cooling system includes a circulating pump, a proportional pressure reducing valve, and a three-way two-position valve. The prime mover, main pump, and circulating pump are connected in sequence. One end of the circulating pump is connected to the hydraulic oil tank system, and the other end is connected to the hydraulic oil tank system through the proportional pressure reducing valve and the three-way two-position valve. The pipeline between the circulating pump and the proportional pressure reducing valve is connected to the return oil pipeline, which is sequentially equipped with an on / off valve, a hydraulic motor, and a radiator. The main pump and the hydraulic oil tank system are both connected to the hydraulic reversing system, which is connected to the hydraulic cylinder. This invention offers high efficiency, flexible layout, and eliminates the need to stop the machine when adjusting the stroke and stroke rate. It also has a small footprint and is easy to install.

Description

Technical Field

[0001] This invention relates to the field of oilfield equipment technology, and more specifically to a numerically controlled hydraulic pumping system. Background Technology

[0002] Currently, rod pump oil production systems have introduced long-stroke pumping units with stroke lengths exceeding 6 meters. Long strokes not only reduce cyclic stress and equipment wear but also increase the gas compression ratio and improve production efficiency. However, conventional beam pumping units present several challenges during installation and operation: direct motor drive and mechanical connection result in high energy consumption and low efficiency; a frequency converter system is needed to adjust the pumping unit's stroke rate; adjusting the stroke and stroke rate requires shutdown, impacting production efficiency, and necessitates the use of cranes and trucks; a large footprint (over 30 square meters), with larger units requiring even more space; the need for pre-installation preparation at the well site, including concrete platforms, gravel, and piles; long installation time (over 2 days), increasing with the size of the unit; and the need for multiple trucks for loading and transportation. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and propose a CNC hydraulic pumping system that flexibly connects the lifting device and the power device, resulting in high efficiency and flexible layout. The stroke and frequency can be adjusted by CNC without stopping the machine. The lifting device can be directly installed on the wellhead equipment, which occupies a small area and is convenient and quick to install.

[0004] The technical solution adopted by this invention to solve its technical problem is:

[0005] A CNC hydraulic pumping system includes a hydraulic power unit and a hydraulic lifting unit; the hydraulic power unit includes a prime mover, a main pump, a hydraulic oil preheating and cooling system, a hydraulic reversing system, and a hydraulic oil tank system; the hydraulic lifting unit includes a hydraulic cylinder.

[0006] The hydraulic oil preheating and cooling system includes a circulating pump, a proportional pressure reducing valve, and a three-way two-position valve; the prime mover, main pump, and circulating pump are connected in sequence, one end of the circulating pump is directly connected to the hydraulic oil tank system, and the other end is connected to the hydraulic oil tank system through the proportional pressure reducing valve and the three-way two-position valve; the pipeline between the circulating pump and the proportional pressure reducing valve is connected to the return oil pipeline, and the return oil pipeline is sequentially equipped with an on / off valve, a hydraulic motor, and a radiator.

[0007] The main pump and hydraulic oil tank system are both connected to the hydraulic reversing system, and the hydraulic reversing system is connected to the hydraulic cylinder.

[0008] The above technical solution uses a motor to drive a pump to provide hydraulic pressure, which in turn drives the lifting unit to move the sucker rod up and down reciprocally to achieve the purpose of oil extraction. It has the advantages of high efficiency, easy adjustment, no need to stop the machine, small footprint, and convenient installation.

[0009] Furthermore, the CNC hydraulic pumping system also includes a stroke sensor, an anti-piston rod rotation system, and a polished rod rotation system; the anti-piston rod rotation system is connected to the piston rod of the hydraulic cylinder and is used to prevent the piston rod from rotating; the polished rod rotation system is used to drive the polished rod to rotate, and the stroke sensor is used to collect the displacement of the hydraulic cylinder.

[0010] Furthermore, the travel sensor includes a proximity switch and a travel lever.

[0011] Furthermore, the optical rod rotation system includes an optical rod rotator and a rotation trigger.

[0012] Furthermore, the CNC hydraulic pumping system also includes a filtration system, which includes a high-pressure filter and a return oil filter. The high-pressure filter is installed on the pipeline between the main pump and the hydraulic reversing system, and the return oil filter is installed on the pipeline between the radiator and the hydraulic oil tank system.

[0013] Furthermore, the hydraulic oil tank system includes an oil tank body, on which an air filter is installed.

[0014] Furthermore, the CNC hydraulic pumping system also includes a sensing and control system, which includes a pressure sensor, a temperature sensor, a flow sensor, a level sensor, a filter element sensor, a pressure control system, a temperature control system, a flow control system, a stroke control system, an up and down stroke control system, a level control system, and a filter element control system.

[0015] Furthermore, the prime mover is either an electric motor or an internal combustion engine.

[0016] Technical effects of the present invention:

[0017] Compared with existing technologies, the CNC hydraulic pumping system of this invention uses a motor to drive a pump to provide hydraulic pressure, which in turn drives a lifting unit to move the sucker rod up and down reciprocally to achieve the purpose of oil extraction. The hydraulic drive is highly efficient. The CNC hydraulic pumping system uses flow control, limit switch control, and pressure control to manually or automatically adjust the stroke and frequency of the pumping unit quickly and easily, without stopping the machine or requiring cranes or trucks for assistance. The lifting unit is installed at the wellhead, occupying less than 0.5 square meters of space. The hydraulic pumping unit power unit and the lifting unit are placed separately and connected by hydraulic pipelines. Their positions are adjustable, eliminating the need for pre-arranged well sites. Well site installation is flexible, requiring only one truck for transportation and installation in less than 6 hours. Operation is simple, safe, and reliable. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structural principle of the CNC hydraulic pumping system of the present invention;

[0019] Figure 2 This is a schematic diagram illustrating the structural principles of the stroke sensor, anti-piston rod rotation system, and smooth rod rotation system of the present invention.

[0020] In the diagram, 1. Prime mover; 2. Main pump; 31. Circulation pump; 32. Proportional pressure reducing valve; 33. Three-way two-position valve; 34. On / off valve; 35. Radiator; 36. Hydraulic motor; 4. Hydraulic reversing system; 5. Return oil line; 61. High-pressure filter; 62. Return oil filter; 71. Oil tank; 72. Air filter; 8. Hydraulic cylinder; 101. Proximity switch; 102. Travel rod; 111. Centralizing rod; 112. Connecting plate; 121. Polished rod rotator; 122. Rotary trigger. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0022] Example 1:

[0023] like Figure 1 and 2 As shown, this embodiment relates to a CNC hydraulic pumping system, which includes a hydraulic power unit and a hydraulic lifting unit. The hydraulic power unit includes a prime mover 1, a main pump 2, a hydraulic oil preheating and cooling system, a hydraulic reversing system 4, a filtration system, a hydraulic oil tank system, and a sensing and control system. The prime mover 1 is an electric motor or an internal combustion engine. The hydraulic lifting unit includes a hollow hydraulic cylinder 8, a stroke sensor, an anti-piston rod rotation system, and a polished rod rotation system.

[0024] The main pump 2 and the hydraulic oil tank system are both connected to the hydraulic reversing system 4, and the hydraulic reversing system 4 is connected to the hydraulic cylinder 8.

[0025] The hydraulic oil preheating and cooling system includes a circulating pump 31, a proportional pressure reducing valve 32, and a three-way two-position valve 33. The prime mover 1, the main pump 2, and the circulating pump 31 are connected in sequence. One end of the circulating pump 31 is directly connected to the hydraulic oil tank system, and the other end is connected to the hydraulic oil tank system through the proportional pressure reducing valve 32 and the three-way two-position valve 33. The pipeline between the circulating pump 31 and the proportional pressure reducing valve 32 is connected to the return oil pipeline 5. The return oil pipeline 5 is sequentially equipped with an on / off valve 34, a hydraulic motor 36, and a radiator 35.

[0026] The filtration system includes a high-pressure filter 61 and a return oil filter 62. The high-pressure filter 61 is installed on the pipeline between the main pump 2 and the hydraulic reversing system 4, and the return oil filter 62 is installed on the pipeline between the radiator 35 and the hydraulic oil tank system.

[0027] The hydraulic oil tank system includes an oil tank body 71, and an air filter 72 is installed on the oil tank body 71.

[0028] The sensing and control system includes a pressure sensor, a temperature sensor, a flow sensor, a level sensor, a filter element sensor, a pressure control system, a temperature control system, a flow control system, a stroke control system, an up-and-down stroke control system, a level control system, a filter element control system, and control solenoid coils for each valve core.

[0029] The anti-piston rod rotation system is connected to the piston rod of the hydraulic cylinder 8 to prevent the piston rod from rotating; the guide rod rotation system is used to drive the guide rod to rotate, and the stroke sensor is used to collect the displacement of the hydraulic cylinder 8. Specifically, the stroke sensor includes a proximity switch 101 and a stroke rod 102, which transmits the stroke information of the hydraulic cylinder 8 to the sensing and control system. The guide rod rotation system includes a guide rod rotator 121 and a rotation trigger 122.

[0030] Working principle: such as Figure 1 and 2 As shown, the hydraulic power unit provides hydraulic power to the hydraulic cylinder 8, and the prime mover 1 drives the main pump 2 to work, outputting hydraulic pressure. The hydraulic pressure enters the P port of the hydraulic reversing system 4 through the high-pressure filter 61 of the filtration system. The hydraulic reversing system 4 switches between the states of oil output from port A and oil return from port B, or vice versa, based on signals from the sensing and control system. The return oil passes through the T port of the hydraulic reversing system 4, passes through the return oil filter 62, and returns to the oil tank. The sensing and control system sends signals to the hydraulic reversing system 4 based on signals from the pressure control system, flow control system, or stroke control system, controlling the switching quantity and switching time of ports A and B, thereby adjusting the stroke and frequency of the pumping unit. Similarly, the specific signal parameter judgment values ​​can also be directly entered into the sensing and control system manually, thereby manually controlling the stroke and frequency of the pumping unit.

[0031] An overflow safety valve installed at the oil outlet of the main pump 2 can control the maximum pressure of the system. Multiple monitoring sensors and feedback devices of the sensing and control system can protect the main pump 2, hydraulic cylinder 8 and other critical components.

[0032] The hydraulic reversing system 4 of the hydraulic power unit has port A connected to the rodless chamber of hydraulic cylinder 8 via a hydraulic pipeline, and port B connected to the rod chamber of hydraulic cylinder 8. When the hydraulic reversing system 4 switches to port A for oil output and port B for oil return, the piston rod of hydraulic cylinder 8 extends, and the hydraulic lifting system moves the polished rod and the sucker rod bundle connected to the polished rod upward. When the hydraulic reversing system 4 switches to port A for oil return and port B for oil output, the piston rod of hydraulic cylinder 8 retracts, and the polished rod and the sucker rod bundle connected to the polished rod move downward. This cycle repeats, working in conjunction with the downhole pump to achieve the function of oil extraction.

[0033] In the smooth rod rotation system, due to the limitation of the arm limiter, it cannot swing downwards, remaining in a horizontal position or swinging upwards. Each up-and-down swing of the drive arm of the smooth rod rotator 121 drives the smooth rod to rotate by a certain angle. Because of its internal limit structure, the horizontal trigger arm of the rotary trigger 122 can rotate upwards by 90 degrees. When the drive handle of the smooth rod rotator 121 passes the position of the rotary trigger 122 during the upstroke, the trigger arm of the rotary trigger 122 rotates upwards by 90 degrees, allowing the drive arm of the smooth rod rotator 121 to pass. During the downstroke, due to the limit structure within the rotary trigger 122, the trigger arm remains horizontal. As the smooth rod rotator 121 descends, the rotator drive handle contacts the trigger, causing the drive handle to swing upwards, driving the smooth rod rotator 121 to rotate the smooth rod by a certain angle.

[0034] In the anti-piston rod rotation system, the connecting plate 112 connects the piston rod and the straightening rod 111. Under the action of the fixing device, the straightening rod 111 can only move up and down, thus preventing the piston rod from rotating during its movement.

[0035] The stroke sensor's stroke rod 102 is connected to the piston rod, and its displacement is the same as that of the piston rod. The trigger at the end of the stroke rod 102 moves with the stroke rod 102, with the same displacement as the piston rod. Proximity switches 101 are installed at the trigger positions corresponding to the piston rod positions at the top dead center and bottom dead center positions of the hydraulic pumping unit's stroke. The triggers and proximity switches 101 work together to send signals to the sensing and control system, thereby controlling the switching between the upstroke and downstroke.

[0036] The circulating pump 31 continuously drives the valve group of the hydraulic oil preheating and cooling system, and the valve group will perform one of the following three operations according to the working temperature of the hydraulic oil:

[0037] 1. Preheating Operation - If the temperature is lower than the manually defined operating temperature, the hydraulic oil will be preheated. The on / off valve 34 in the valve assembly is in the off state, and the three-way two-position valve 33 connects the proportional pressure reducing valve 32 and the oil tank 71. The hydraulic oil is guided through the proportional pressure reducing valve 32, bypassing the radiator 35, hydraulic motor 36, and return oil filter 62, and enters the hydraulic oil tank 71. This prevents damage to the radiator 35 and return oil filter 62 due to high hydraulic oil viscosity caused by low temperature during cold starts. The proportional pressure reducing valve 32 utilizes the characteristic of hydraulic oil releasing heat by consuming hydraulic energy, enabling the hydraulic oil to be quickly preheated to the defined operating temperature.

[0038] 2. Cooler Bypass Function - If the temperature is within the manually defined operating temperature range, the on / off valve 34 in the valve assembly is in the off state, and the three-way two-position valve 33 connects the proportional pressure reducing valve 32 and the radiator 35. The hydraulic oil is guided through the proportional pressure reducing valve 32, the radiator 35, and the return oil filter 62, bypassing the hydraulic motor 36, and entering the oil tank 71. Since the hydraulic oil does not pass through the hydraulic motor 36, the radiator fan does not rotate, thereby reducing the cooling rate of the hydraulic oil.

[0039] 3. Cooling Measures - If the temperature exceeds the manually defined operating temperature range, the on / off valve 34 in the valve assembly is in the open state, and the three-way two-position valve 33 connects the proportional pressure reducing valve 32 and the radiator 35. The hydraulic oil is divided into two paths: one path passes through the on / off valve 34, the hydraulic motor 36, the radiator 35, and the return oil filter 62 back to the oil tank, driving the hydraulic motor 36 to rotate the fan and improve the cooling efficiency of the radiator 35; the other path passes through the proportional pressure reducing valve 32, the three-way two-position valve 33, the radiator 35, and the return oil filter 62 back to the oil tank. In this state, the sensing and control system adjusts the proportional pressure reducing valve 32 to control the pressure in the hydraulic motor 36 oil circuit, automatically changing the fan speed to maintain the temperature. Simultaneously, the flow control valve in this oil circuit limits the maximum flow through the hydraulic motor 36 to protect it.

[0040] The return oil filter 62 includes an internal bypass valve. This valve allows hydraulic oil to bypass the filter element when the filter element is clogged with contaminants or when the flow rate exceeds the filter element. Two desiccant air filters 72 are installed on the reservoir. As the oil level in the reservoir rises and falls, the desiccant air filters 72 filter the air flowing into and out of the reservoir, ensuring stable pressure within the hydraulic oil tank.

[0041] A high-pressure filter 61 downstream of the main pump 2 ensures that all oil supplied to the hydraulic circuit is filtered to prevent contamination. The high-pressure filter 61 includes a digital indicator connected to a sensing and control system to indicate the status of the high-pressure filter 61, ensuring proper system maintenance.

[0042] The above-described specific embodiments are merely specific examples of the present invention. The patent protection scope of the present invention includes, but is not limited to, the above-described specific embodiments. Any appropriate changes or modifications made by a person skilled in the art that conform to the claims of the present invention should fall within the patent protection scope of the present invention.

Claims

1. A numerically controlled hydraulic pumping system, characterized in that: Includes a hydraulic power unit, a hydraulic lifting unit, and a filtration system; The hydraulic power unit includes a prime mover (1), a main pump (2), a hydraulic oil preheating and cooling system, a hydraulic reversing system (4), and a hydraulic oil tank system; the hydraulic lifting unit includes a hydraulic cylinder (8). The hydraulic oil preheating and cooling system includes a circulating pump (31), a proportional pressure reducing valve (32), and a three-way two-position valve (33); the prime mover (1), the main pump (2), and the circulating pump (31) are connected in sequence. One end of the circulating pump (31) is directly connected to the hydraulic oil tank system, and the other end is connected to the hydraulic oil tank system through the proportional pressure reducing valve (32) and the three-way two-position valve (33); the pipeline between the circulating pump (31) and the proportional pressure reducing valve (32) is connected to the return oil pipeline (5), and the return oil pipeline (5) is equipped with an on / off valve (34), a hydraulic motor (36), and a radiator (35) in sequence. The main pump (2) and the hydraulic oil tank system are both connected to the hydraulic reversing system (4), and the hydraulic reversing system (4) is connected to the hydraulic cylinder (8); The filtration system includes a high-pressure filter (61) and a return oil filter (62). The high-pressure filter (61) is installed on the pipeline between the main pump (2) and the hydraulic reversing system (4), and the return oil filter (62) is installed on the pipeline between the radiator (35) and the hydraulic oil tank system. The circulating pump (31) continuously drives hydraulic oil to the valve assembly of the hydraulic oil preheating and cooling system. The valve assembly performs one of the following three operations according to the working temperature of the hydraulic oil: Preheating operation: If the temperature is lower than the manually defined working temperature, the hydraulic oil will be preheated; the on-off valve (34) in the valve group is in the off state, and the three-way two-position valve (33) connects the proportional pressure reducing valve (32) and the oil tank (71); The hydraulic oil is guided through the proportional pressure reducing valve (32), bypassing the radiator (35), hydraulic motor (36) and return oil filter (62), and enters the hydraulic oil tank (71); this prevents damage to the radiator (35) and return oil filter (62) due to the high viscosity of the hydraulic oil caused by the low temperature during cold start; the proportional pressure reducing valve (32) uses the characteristic of hydraulic oil consuming hydraulic energy and releasing heat to enable the hydraulic oil to be quickly preheated to the defined working temperature; Cooler bypass operation: If the temperature is within the manually defined operating temperature range, the on / off valve (34) in the valve group is in the off state, and the three-way two-position valve (33) connects the proportional pressure reducing valve (32) and the radiator (35); the hydraulic oil is guided through the proportional pressure reducing valve (32), the radiator (35) and the return oil filter (62), bypassing the hydraulic motor (36) and entering the oil tank (71); the hydraulic oil does not pass through the hydraulic motor (36), and the radiator (35) fan does not rotate, thereby reducing the cooling rate of the hydraulic oil; Cooling measures operation: If the temperature exceeds the manually defined operating temperature range, the on-off valve (34) in the valve group is in the open state, and the three-way two-position valve (33) connects the proportional pressure reducing valve (32) and the radiator (35); the hydraulic oil is guided to split into two paths, one path passes through the on-off valve (34), the hydraulic motor (36), the radiator (35), and the return oil filter (62) back to the oil tank, driving the hydraulic motor (36) to drive the fan to rotate, thereby improving the cooling efficiency of the radiator (35); the other path passes through the proportional pressure reducing valve (32), the three-way two-position valve (33), the radiator (35), and the return oil filter (62) back to the oil tank; in this state, the sensing and control system adjusts the proportional pressure reducing valve (32) to control the pressure of the oil circuit through the hydraulic motor (36) and automatically changes the fan speed to maintain the temperature; at the same time, the flow control valve on this oil circuit limits the maximum flow through the hydraulic motor (36) to protect the hydraulic motor (36).

2. The CNC hydraulic pumping system according to claim 1, characterized in that: The CNC hydraulic pumping system also includes a stroke sensor, an anti-piston rod rotation system, and a smooth rod rotation system; the anti-piston rod rotation system is connected to the piston rod of the hydraulic cylinder (8) and is used to prevent the piston rod from rotating; the smooth rod rotation system is used to drive the smooth rod to rotate, and the stroke sensor is used to collect the displacement of the hydraulic cylinder (8).

3. The CNC hydraulic pumping system according to claim 2, characterized in that: The travel sensor includes a proximity switch (101) and a travel lever (102).

4. The CNC hydraulic pumping system according to claim 2, characterized in that: The optical rod rotation system includes an optical rod rotator (121) and a rotation trigger (122).

5. The CNC hydraulic pumping system according to claim 1, characterized in that: The hydraulic oil tank system includes an oil tank body (71), on which an air filter (72) is provided.

6. The CNC hydraulic pumping system according to claim 1, characterized in that: The CNC hydraulic pumping system also includes a sensing and control system, which includes a pressure sensor, a temperature sensor, a flow sensor, a level sensor, a filter element sensor, a pressure control system, a temperature control system, a flow control system, a stroke control system, an up and down stroke control system, a level control system, and a filter element control system.

7. The CNC hydraulic pumping system according to any one of claims 1-6, characterized in that: The prime mover (1) is an electric motor or an internal combustion engine.

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