Energy-saving hydraulic oil pumping unit

Abstract

The utility model relates to an energy-saving hydraulic oil pumping unit, which belongs to the technical field of oil production equipment, and is characterized in that a first closed circulation hydraulic cylinder structure composed of a first rough section oil cylinder, a middle communication pipe, a second rough section oil cylinder, a first piston rod and a second piston rod is arranged on a derrick, and a second closed circulation hydraulic cylinder structure composed of a first thin section oil cylinder, a first thin section oil cylinder communication pipe, an oil pump, a second thin section oil cylinder communication pipe, a second thin section oil cylinder, a first piston rod and a second piston rod is arranged on the derrick. The lower end of the first thin section oil cylinder piston rod of the first piston rod is connected with a counterweight, and the lower end of the second thin section oil cylinder piston rod of the second piston rod is connected with a well rod. The double closed circulation hydraulic cylinder structure fully utilizes the potential energy of the counterweight descending, saves energy and reduces production cost.

Description

Technical Field

[0001] This invention belongs to the field of petroleum production equipment technology, and specifically relates to an energy-saving hydraulic pumping unit. Background Technology

[0002] Existing beam pumping units use a crank-rocker structure, resulting in excessive energy loss from the motor. Furthermore, the structure prevents the complete recovery of the counterweight potential energy, leading to low efficiency. Hydraulic pumping units, on the other hand, suffer from poor efficiency because the counterweight potential energy is derived from pipelines, valves, and energy storage devices, and their layout and use are inefficient, also preventing effective recovery of the counterweight potential energy.

[0003] Publication number CN113982539B discloses a "downward-pressurized multi-functional hydraulic pumping unit and its application", which has a single closed-loop hydraulic cylinder structure and the potential energy of the counterweight cannot be effectively recovered. Summary of the Invention

[0004] The purpose of this invention is to solve the problem of the inability to effectively recover the counterweight potential in existing hydraulic pumping units, and to provide an energy-saving hydraulic pumping unit.

[0005] An energy-saving hydraulic pumping unit includes a first thin-section cylinder, a second thin-section cylinder, a first thick-section cylinder, a second thick-section cylinder, an intermediate connecting pipe, a first piston rod, a second piston rod, an oil pump, a connecting pipe for the first thin-section cylinder, a connecting pipe for the second thin-section cylinder, a counterweight, and a well rod. The first piston rod is formed by connecting the first thin section hydraulic cylinder piston rod and the first thick section hydraulic cylinder piston rod, and the second piston rod is formed by connecting the second thin section hydraulic cylinder piston rod and the second thick section hydraulic cylinder piston rod; The bottom end of the second thin-section hydraulic cylinder piston rod is connected to the well rod, and the bottom end of the first thin-section hydraulic cylinder piston rod is connected to the counterweight; or the bottom end of the second thin-section hydraulic cylinder piston rod is connected to the counterweight, and the bottom end of the first thin-section hydraulic cylinder piston rod is connected to the well rod.

[0006] The bottom end of the second thin-section cylinder piston rod and the bottom end of the first thin-section cylinder piston rod are both connected to the well rod, which is used for simultaneous oil extraction from adjacent dual oil wells.

[0007] The first thin section hydraulic cylinder is connected to the first thick section hydraulic cylinder to form the first vertical hydraulic cylinder. The inner diameter of the first thick section hydraulic cylinder is larger than the inner diameter of the first thin section hydraulic cylinder, and the bottom of the first thin section hydraulic cylinder is closed.

[0008] The second thin section hydraulic cylinder is connected to the second thick section hydraulic cylinder to form a second vertical hydraulic cylinder. The inner diameter of the second thick section hydraulic cylinder is larger than the inner diameter of the second thin section hydraulic cylinder, and the bottom of the second thin section hydraulic cylinder is closed.

[0009] The first and second thin-segment hydraulic cylinders are of the same length. The intermediate connecting pipe connects the first and second vertical hydraulic cylinders. The two ports of the intermediate connecting pipe are located at the bottom of the first and second thick-segment hydraulic cylinders, respectively, and are connected to the first and second thick-segment hydraulic cylinders, respectively.

[0010] One port of the oil pump is connected to the bottom end of the first thin-section oil cylinder through a first thin-section oil cylinder connecting pipe; the other port of the oil pump is connected to the bottom end of the second thin-section oil cylinder through a second thin-section oil cylinder connecting pipe.

[0011] The first piston rod and the second piston rod are of the same length.

[0012] The first piston rod is located in the first vertical cylinder. The bottom of the first thick section of the first piston rod has a first thin piston, and the top of the first thick section of the first piston rod has a first thick piston. The first thin piston is located in the first thin section of the first cylinder, and the first thick piston is located in the first thick section of the first cylinder.

[0013] The second piston rod is located in the second vertical cylinder. The bottom of the second thick section of the second piston rod has a second thin piston, and the top of the second thick section of the second piston rod has a second thick piston. The second thin piston is located in the second thin section of the second cylinder, and the second thick piston is located in the second thick section of the second cylinder.

[0014] Both the first and second thin-segment hydraulic cylinder connecting pipes are equipped with valves, which are used to control the opening and closing of the first and second thin-segment hydraulic cylinder connecting pipes.

[0015] Both the first and second thin-section hydraulic cylinder connecting pipes are equipped with energy storage tanks.

[0016] The oil pump is connected to a power source, which drives the oil pump to work. In this embodiment, the power source is an electric motor.

[0017] The first vertical cylinder, the second vertical cylinder, the oil pump, and the power source are installed on the derrick.

[0018] The two ports of the intermediate connecting pipe are flared, which allows hydraulic oil from the first and second coarse-section cylinders to flow smoothly into the intermediate connecting pipe.

[0019] The port connecting the first thin-section hydraulic cylinder to the first thin-section hydraulic cylinder is a flared opening; the port connecting the second thin-section hydraulic cylinder to the second thin-section hydraulic cylinder is a flared opening, which allows the hydraulic oil to flow smoothly.

[0020] The first coarse-section hydraulic cylinder, the intermediate connecting pipe, the second coarse-section hydraulic cylinder, the first piston rod, and the second piston rod constitute the first closed-loop hydraulic cylinder structure; the first fine-section hydraulic cylinder, the first fine-section hydraulic cylinder connecting pipe, the oil pump, the second fine-section hydraulic cylinder connecting pipe, the second fine-section hydraulic cylinder, the first piston rod, and the second piston rod constitute the second closed-loop hydraulic cylinder structure.

[0021] The working process of this utility model: When the second piston rod is at its highest position, the oil pump operates, pumping hydraulic oil into the connecting pipe of the first thin section oil cylinder. At this time, the hydraulic oil in the second thin section oil cylinder and the connecting pipe of the second thin section oil cylinder is pumped into the first thin section oil cylinder through the connecting pipe of the first thin section oil cylinder. The hydraulic oil in the first thin section oil cylinder pushes the first piston rod upward, thereby driving the counterweight upward. At the same time, the second piston rod moves downward, thereby driving the well rod downward into the oil well. Meanwhile, the hydraulic oil in the second thick section oil cylinder, under the downward pressure of the second thick piston, enters the second thick section oil cylinder through the intermediate connecting pipe to push the first thick piston and then push the first piston rod upward, forming a mechanism of double oil cylinders pushing the first piston rod, which increases the thrust of pushing the first piston rod.

[0022] When the first piston rod is at its highest position, the oil pump operates, pumping hydraulic oil into the connecting pipe of the second thin section cylinder. At this time, the hydraulic oil in the first thin section cylinder and the connecting pipe of the first thin section cylinder is pumped into the second thin section cylinder through the connecting pipe of the second thin section cylinder. The hydraulic oil in the second thin section cylinder pushes the second piston rod upward, thereby driving the well rod upward to pump oil. At the same time, the first piston rod moves downward, and the counterweight can also drive the first piston rod downward by its own weight. The potential energy of the counterweight is fully utilized. Meanwhile, the hydraulic oil in the first coarse section cylinder, under the downward pressure of the first coarse piston, enters the second coarse section cylinder through the intermediate connecting pipe to push the second coarse piston and then push the second piston rod upward, forming a mechanism of double cylinders pushing the second piston rod, which increases the thrust of pushing the second piston rod.

[0023] The oil pump operates in a reciprocating motion, which in turn drives the well rod of the pumping unit to move up and down to achieve oil extraction.

[0024] When two oil wells are adjacent, the lower ends of the first and second piston rods are both connected to the well rod, allowing for simultaneous oil pumping operations on both adjacent wells. This enables one pumping unit to pump oil from two wells, significantly reducing production costs.

[0025] The beneficial effects of this utility model are: 1. The unique hydraulic cylinder structure, which combines coarse and fine cylinders, efficiently integrates the counterweight potential energy and driving force, thereby improving work efficiency. 2. The first coarse section cylinder and the second coarse section cylinder are directly connected through an intermediate connecting pipe, which reduces the loss of potential energy during recovery. 3. The two ports of the intermediate connecting pipe are flared, which improves the flow efficiency of hydraulic oil; 4. The double-closed circulation hydraulic cylinder structure can effectively recover the potential energy generated by the falling downhole rod and also increase the thrust on the upward piston rod; 5. This utility model can simultaneously extract oil from two adjacent wells, saving energy and greatly reducing production costs. Attached Figure Description

[0026] Figure 1 This is a perspective view of an embodiment of the present utility model; Figure 2 This is a first partially enlarged three-dimensional schematic diagram of an embodiment of the present utility model; Figure 3 This is a second partially enlarged three-dimensional schematic diagram of an embodiment of this utility model; Figure 4 This is a third enlarged perspective view of an embodiment of the present utility model; Figure 5 This is a perspective sectional view of the horn-shaped port of an embodiment of the present invention; Figure 6 This is a three-dimensional schematic diagram from another perspective of an embodiment of the present utility model. Detailed Implementation

[0027] like Figures 1 to 6 As shown, an energy-saving hydraulic pumping unit includes a first thin-section cylinder 1, a second thin-section cylinder 2, a first coarse-section cylinder 3, a second coarse-section cylinder 4, an intermediate connecting pipe 5, a first piston rod 6, a second piston rod 7, an oil pump 8, a first thin-section cylinder connecting pipe 9, a second thin-section cylinder connecting pipe 10, a counterweight 11, and a well rod 12. The first piston rod 6 is formed by connecting the first thin section hydraulic cylinder piston rod 63 and the first thick section hydraulic cylinder piston rod 64, and the second piston rod 7 is formed by connecting the second thin section hydraulic cylinder piston rod 73 and the second thick section hydraulic cylinder piston rod 74.

[0028] The bottom end of the second thin-section cylinder piston rod 73 is connected to the well rod 12, and the bottom end of the first thin-section cylinder piston rod 63 is connected to the counterweight 11, or the bottom end of the second thin-section cylinder piston rod 73 is connected to the counterweight 11, and the bottom end of the first thin-section cylinder piston rod 63 is connected to the well rod 12.

[0029] The bottom end of the second thin-section cylinder piston rod 73 and the bottom end of the first thin-section cylinder piston rod 63 are both connected to the well rod 12 for simultaneous oil extraction from adjacent dual oil wells.

[0030] The first thin section cylinder 1 and the first thick section cylinder 3 are connected to form the first vertical cylinder A. The inner diameter of the first thick section cylinder 3 is larger than the inner diameter of the first thin section cylinder 1, and the bottom of the first thin section cylinder 1 is closed.

[0031] The second thin section hydraulic cylinder 2 and the second thick section hydraulic cylinder 4 are connected to form the second vertical hydraulic cylinder B. The inner diameter of the second thick section hydraulic cylinder 4 is larger than the inner diameter of the second thin section hydraulic cylinder 2, and the bottom of the second thin section hydraulic cylinder 2 is closed.

[0032] The first thin-segment hydraulic cylinder 1 and the second thin-segment hydraulic cylinder 2 have the same length. The intermediate connecting pipe 5 connects the first vertical hydraulic cylinder A and the second vertical hydraulic cylinder B. The two ports 51 of the intermediate connecting pipe 5 are located at the bottom ends of the first thick-segment hydraulic cylinder 3 and the second thick-segment hydraulic cylinder 4, respectively, and are connected to the first thick-segment hydraulic cylinder 3 and the second thick-segment hydraulic cylinder 4, respectively.

[0033] One port of the oil pump 8 is connected to the bottom end of the first thin-section oil cylinder 1 through the first thin-section oil cylinder connecting pipe 9; the other port of the oil pump 8 is connected to the bottom end of the second thin-section oil cylinder 2 through the second thin-section oil cylinder connecting pipe 10.

[0034] The first piston rod 6 and the second piston rod 7 are of the same length.

[0035] The first piston rod 6 is located in the first vertical cylinder A. The bottom of the first thick section of the first piston rod 64 has a first thin piston 61, and the top of the first thick section of the first piston rod 64 has a first thick piston 62. The first thin piston 61 is located in the first thin section of the first cylinder 1; the first thick piston 62 is located in the first thick section of the first cylinder 3.

[0036] The second piston rod 7 is located in the second vertical cylinder B. The bottom of the second thick section cylinder piston rod 74 of the second piston rod 7 has a second thin piston 71, and the top of the second thick section cylinder piston rod 74 has a second thick piston 72. The second thin piston 71 is located in the second thin section cylinder 2; the second thick piston 72 is located in the second thick section cylinder 4.

[0037] Both the first thin-segment hydraulic cylinder connecting pipe 9 and the second thin-segment hydraulic cylinder connecting pipe 10 are equipped with valves 13, which are used to control the opening and closing of the first thin-segment hydraulic cylinder connecting pipe 9 and the second thin-segment hydraulic cylinder connecting pipe 10.

[0038] Both the first thin-section hydraulic cylinder connecting pipe 9 and the second thin-section hydraulic cylinder connecting pipe 10 are equipped with energy storage tanks 14.

[0039] The oil pump 8 is connected to the power source 15, and the power source 15 drives the oil pump 8 to work. In this embodiment, the power source 15 is an electric motor.

[0040] The first vertical cylinder A, the second vertical cylinder B, the oil pump 8, and the power source 15 are installed on the derrick 16.

[0041] like Figure 3 As shown, the two ports 51 of the intermediate connecting pipe 5 are flared openings, which allow the hydraulic oil in the first coarse section cylinder 3 and the second coarse section cylinder 4 to smoothly enter the intermediate connecting pipe 5.

[0042] like Figure 4 As shown, the port 51 connecting the first thin-segment hydraulic cylinder connecting pipe 9 and the first thin-segment hydraulic cylinder 1 is a flared opening; the port 51 connecting the second thin-segment hydraulic cylinder connecting pipe 10 and the second thin-segment hydraulic cylinder 2 is a flared opening, and the flared opening can make the hydraulic oil flow smoothly.

[0043] The first coarse-section hydraulic cylinder 3, the intermediate connecting pipe 5, the second coarse-section hydraulic cylinder 4, the first piston rod 6, and the second piston rod 7 constitute the first closed-loop hydraulic cylinder structure; the first fine-section hydraulic cylinder 1, the first fine-section hydraulic cylinder connecting pipe 9, the oil pump 8, the second fine-section hydraulic cylinder connecting pipe 10, the second fine-section hydraulic cylinder 2, the first piston rod 6, and the second piston rod 7 constitute the second closed-loop hydraulic cylinder structure.

[0044] The working process of this embodiment: Cooperate Figures 1 to 4 As shown, when the second piston rod 7 is at its highest position, the oil pump 8 operates, pumping hydraulic oil into the first thin-section oil cylinder connecting pipe 9. At this time, the hydraulic oil in the second thin-section oil cylinder 2 and the second thin-section oil cylinder connecting pipe 10 is pumped to the first thin-section oil cylinder 1 through the first thin-section oil cylinder connecting pipe 9. The hydraulic oil in the first thin-section oil cylinder 1 pushes the first piston rod 6 upward, thereby driving the counterweight 11 upward. At the same time, the second piston rod 7 moves downward, thereby driving the well rod 12 downward into the oil well. Meanwhile, the hydraulic oil in the second coarse-section oil cylinder 4, under the downward pressure of the second coarse piston 72, enters the second coarse-section oil cylinder 3 through the intermediate connecting pipe 5, pushing the first coarse piston 62 and thus pushing the first piston rod 6 upward, forming a mechanism of double oil cylinders pushing the first piston rod 6, which increases the thrust of pushing the first piston rod 6.

[0045] When the first piston rod 6 is at its highest position, the oil pump 8 operates, pumping hydraulic oil into the second thin-section cylinder connecting pipe 10. At this time, the hydraulic oil in the first thin-section cylinder 1 and the first thin-section cylinder connecting pipe 9 is pumped to the second thin-section cylinder 2 through the second thin-section cylinder connecting pipe 10. The hydraulic oil in the second thin-section cylinder 2 pushes the second piston rod 7 upward, thereby driving the well rod 12 upward to pump oil. At the same time, the first piston rod 6 moves downward, and the counterweight 11 can also drive the first piston rod 6 downward by its own weight. The potential energy of the counterweight 11 is fully utilized. Meanwhile, the hydraulic oil in the first coarse-section cylinder 3, under the downward pressure of the first coarse piston 62, enters the second coarse-section cylinder 4 through the intermediate connecting pipe 5 to push the second coarse piston 72 and then push the second piston rod 7 upward, forming a mechanism of double cylinders pushing the second piston rod 7, which increases the thrust of pushing the second piston rod 7.

[0046] The oil pump 8 operates in a reciprocating motion, which in turn drives the well rod 12 of the pumping unit to move up and down to achieve oil extraction.

[0047] When two oil wells are adjacent, the lower ends of the first piston rod 6 and the second piston rod 7 are both connected to the well rod 12, and oil pumping operations are carried out on the two adjacent oil wells at the same time, realizing the oil pumping operation of two oil wells by one pumping unit, which greatly saves production costs.

Claims

1. An energy-saving hydraulic pumping unit, characterized in that: It includes a first fine section cylinder (1), a second fine section cylinder (2), a first coarse section cylinder (3), a second coarse section cylinder (4), an intermediate connecting pipe (5), a first piston rod (6), a second piston rod (7), an oil pump (8), a first fine section cylinder connecting pipe (9), a second fine section cylinder connecting pipe (10), a counterweight (11), and a well rod (12). The first piston rod (6) is formed by the first thin section hydraulic cylinder piston rod (63) and the first thick section hydraulic cylinder piston rod (64), and the second piston rod (7) is formed by connecting the second thin section hydraulic cylinder piston rod (73) and the second thick section hydraulic cylinder piston rod (74); The bottom end of the second section of the cylinder piston rod (73) is connected to the well rod (12), and the bottom end of the first section of the cylinder piston rod (63) is connected to the counterweight (11). The first thin section cylinder (1) and the first thick section cylinder (3) are connected to form the first vertical cylinder (A). The inner diameter of the first thick section cylinder (3) is larger than the inner diameter of the first thin section cylinder (1). The bottom of the first thin section cylinder (1) is closed. The second thin section cylinder (2) is connected to the second thick section cylinder (4) to form the second vertical cylinder (B). The inner diameter of the second thick section cylinder (4) is larger than the inner diameter of the second thin section cylinder (2). The bottom of the second thin section cylinder (2) is closed. The first thin-section cylinder (1) and the second thin-section cylinder (2) have the same length. The middle connecting pipe (5) connects the first vertical cylinder (A) and the second vertical cylinder (B). The two ports (51) of the middle connecting pipe (5) are located at the bottom of the first thick-section cylinder (3) and the second thick-section cylinder (4) respectively, and are connected to the first thick-section cylinder (3) and the second thick-section cylinder (4) respectively. One port of the oil pump (8) is connected to the bottom end of the first thin-section oil cylinder (1) through the first thin-section oil cylinder connecting pipe (9); the other port of the oil pump (8) is connected to the bottom end of the second thin-section oil cylinder (2) through the second thin-section oil cylinder connecting pipe (10); The first piston rod (6) and the second piston rod (7) are of the same length; The first piston rod (6) is located in the first vertical cylinder (A). The bottom of the first thick section cylinder piston rod (64) of the first piston rod (6) has a first thin piston (61), and the top of the first thick section cylinder piston rod (64) has a first thick piston (62). The first thin piston (61) is located in the first thin section cylinder (1); the first thick piston (62) is located in the first thick section cylinder (3). The second piston rod (7) is located in the second vertical cylinder (B). The bottom of the second thick section cylinder piston rod (74) of the second piston rod (7) has a second thin piston (71), and the top of the second thick section cylinder piston rod (74) has a second thick piston (72). The second thin piston (71) is located in the second thin section cylinder (2); the second thick piston (72) is located in the second thick section cylinder (4). The oil pump (8) is connected to the power source (15).

2. The energy-saving hydraulic pumping unit according to claim 1, characterized in that: Both the first thin-segment hydraulic cylinder connecting pipe (9) and the second thin-segment hydraulic cylinder connecting pipe (10) are equipped with valves (13).

3. The energy-saving hydraulic pumping unit according to claim 1, characterized in that: Both the first thin-section hydraulic cylinder connecting pipe (9) and the second thin-section hydraulic cylinder connecting pipe (10) are equipped with energy storage tanks (14).

4. The energy-saving hydraulic pumping unit according to claim 1, characterized in that: The power source (15) is an electric motor.

5. The energy-saving hydraulic pumping unit according to claim 1, characterized in that: The first vertical cylinder (A), the second vertical cylinder (B), the oil pump (8), and the power source (15) are mounted on the derrick (16).

6. The energy-saving hydraulic pumping unit according to claim 1, characterized in that: The bottom end of the second thin-section cylinder piston rod (73) is connected to a counterweight (11), and the bottom end of the first thin-section cylinder piston rod (63) is connected to a well rod (12).

7. The energy-saving hydraulic pumping unit according to claim 1, characterized in that: The bottom end of the second thin-section cylinder piston rod (73) and the bottom end of the first thin-section cylinder piston rod (63) are both connected to the well rod (12).

8. The energy-saving hydraulic pumping unit according to claim 1, characterized in that: The two ports (51) of the intermediate connecting pipe (5) are horn-shaped.

9. An energy-saving hydraulic pumping unit according to claim 1, characterized in that: The port (51) connecting the first thin-segment hydraulic cylinder connecting pipe (9) and the first thin-segment hydraulic cylinder (1) is a flared opening; the port (51) connecting the second thin-segment hydraulic cylinder connecting pipe (10) and the second thin-segment hydraulic cylinder (2) is a flared opening.

Images