Energy-saving hydraulic pumping unit

Abstract

An energy-saving hydraulic pumping unit belongs to the technical field of petroleum production equipment and is characterized in that a first closed circulating hydraulic cylinder structure consisting of a first thick-section oil cylinder, a middle communicating pipe, a second thick-section oil cylinder, a first piston rod and a second piston rod is arranged on a derrick; and the second closed circulating hydraulic cylinder structure consists of a first thin-section oil cylinder, a first thin-section oil cylinder communicating pipe, an oil pump, a second thin-section oil cylinder communicating pipe, a second thin-section oil cylinder, a first piston rod and a second piston rod. The lower end of the first thin-section oil cylinder piston rod of the first piston rod is connected with the balance weight, the lower end of the second thin-section oil cylinder piston rod of the second piston rod is connected with the well rod, the double-closed circulation hydraulic cylinder structure fully utilizes potential energy of descending of the balance weight, energy is saved, and production cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of petroleum production equipment, and in particular relates to an energy-saving hydraulic oil pumping unit. Background Art

[0002] The existing walking beam pumping unit adopts a crank rocker structure, which causes excessive energy loss in the motor. At the same time, due to the structure, the counterweight potential energy cannot be fully recovered, so the efficiency is low. For hydraulic pumping units, the counterweight potential energy is in the form of pipelines, and the layout and use of valves and energy storage devices are unreasonable, and the counterweight potential energy cannot be effectively recovered, so the efficiency does not meet expectations.

[0003] Publication No. CN113982539B discloses a "downward pressure multifunctional hydraulic pumping unit and its application", which has a single closed-cycle hydraulic cylinder structure and the counterweight potential energy cannot be effectively recovered. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem that the counterweight potential energy of the existing hydraulic oil pumping unit cannot be effectively recovered, and to provide an energy-saving hydraulic oil pumping unit.

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

[0006] The bottom ends of the second thin section oil cylinder piston rod and the bottom ends of the first thin section oil cylinder piston rod are both connected to the well rod, and are used for pumping oil from two adjacent oil wells at the same time.

[0007] The first thin section oil cylinder is connected to the first thick section oil cylinder to form a first vertical oil cylinder. The inner diameter of the first thick section oil cylinder is larger than that of the first thin section oil cylinder. The bottom of the first thin section oil cylinder is closed.

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

[0009] The first thin section oil cylinder and the second thin section oil cylinder have the same length, the intermediate connecting pipe is connected between the first vertical oil cylinder and the second vertical oil cylinder, and the two ports of the intermediate connecting pipe are respectively located at the bottom ends of the first thick section oil cylinder and the second thick section oil cylinder, and are respectively connected to the first thick section oil cylinder and the second thick section oil cylinder.

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

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

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

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

[0014] The first thin section oil cylinder connecting pipe and the second thin section oil cylinder connecting pipe are both installed with valves, and the valves are used to control the opening and closing of the first thin section oil cylinder connecting pipe and the second thin section oil cylinder connecting pipe.

[0015] The first thin section oil cylinder connecting pipe and the second thin section oil cylinder connecting pipe are both installed with energy storage tanks.

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

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

[0018] The two ports of the intermediate connecting pipe are trumpet-shaped ports, which enable the hydraulic oil in the first thick section oil cylinder and the second thick section oil cylinder to smoothly enter the intermediate connecting pipe.

[0019] The port where the first thin section oil cylinder connecting pipe communicates with the first thin section oil cylinder is a trumpet-shaped port; the port where the second thin section oil cylinder connecting pipe communicates with the second thin section oil cylinder is a trumpet-shaped port, which can make the hydraulic oil flow smoothly.

[0020] The first thick section oil cylinder, the middle connecting pipe and the second thick section oil cylinder, the first piston rod and the second piston rod constitute a first closed-circuit hydraulic cylinder structure; the first thin section oil cylinder, the first thin section oil cylinder connecting pipe, the oil pump, the second thin section oil cylinder connecting pipe, the second thin section oil cylinder, the first piston rod and the second piston rod constitute a second closed-circuit hydraulic cylinder structure.

[0021] Working process of the present invention: When the second piston rod is in the highest position, the oil pump works to pump hydraulic oil to 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 to 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. At the same time, the hydraulic oil in the second thick section oil cylinder enters the second thick section oil cylinder through the middle connecting pipe under the downward pressure of the second thick piston, pushes the first thick piston and then pushes the first piston rod upward, forming a mechanism of dual oil cylinders pushing the first piston rod, thereby increasing the thrust of pushing the first piston rod.

[0022] When the first piston rod is in the highest position, the oil pump works to pump hydraulic oil to the second thin section oil cylinder connecting pipe. At this time, the hydraulic oil in the first thin section oil cylinder and the first thin section oil cylinder connecting pipe is pumped to the second thin section oil cylinder through the second thin section oil cylinder connecting pipe. The hydraulic oil in the second thin section oil 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, and the potential energy of the counterweight is fully utilized. At the same time, the hydraulic oil in the first thick section oil cylinder enters the second thick section oil cylinder through the middle connecting pipe under the downward pressure of the first thick piston, pushes the second thick piston and then pushes the second piston rod upward, forming a mechanism of dual cylinders pushing the second piston rod, which increases the thrust of pushing the second piston rod.

[0023] The oil pump works reciprocatingly, which in turn drives the well rod of the pumping unit to move up and down to pump oil.

[0024] When two oil wells are adjacent, the lower ends of the first piston rod and the second piston rod are connected to the well rod, and the two adjacent oil wells are pumped at the same time, realizing the pumping operation of two oil wells by one pumping unit, which greatly saves production costs.

[0025] Beneficial effects of the present invention: 1. The unique coarse and fine combination of oil cylinder structure effectively integrates the counterweight potential energy and driving force, thus improving work efficiency; 2. The first coarse section oil cylinder and the second coarse section oil cylinder are directly connected through an intermediate connecting pipe, which reduces the loss of potential energy recovery along the path; 3. The two ports of the intermediate connecting pipe are trumpet-shaped, which improves the flow efficiency of the hydraulic oil; 4. The double closed-circuit hydraulic cylinder structure can effectively recover the potential energy generated by the falling well rod and increase the thrust on the upward piston rod; 5. The present invention can produce oil from two adjacent wells simultaneously, saving energy and greatly reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a perspective schematic diagram of an embodiment of the present invention; Figure 2 is a first partial enlarged stereoscopic schematic diagram of an embodiment of the present invention; Figure 3 is a second partial enlarged perspective schematic diagram of an embodiment of the present invention; Figure 4 is a third partial enlarged perspective schematic diagram of an embodiment of the present invention; Figure 5 is a three-dimensional cross-sectional view of a trumpet-shaped port according to an embodiment of the present invention; Figure 6 It is a three-dimensional schematic diagram from another perspective of an embodiment of the present invention. DETAILED DESCRIPTION

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

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

[0029] The bottom ends of the second thin section oil cylinder piston rod 73 and the bottom ends of the first thin section oil cylinder piston rod 63 are both connected to the well rod 12 for pumping oil from two adjacent oil wells simultaneously.

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

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

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

[0035] 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 coarse piston 62. The first fine piston 61 is located in the first thin section cylinder 1; the first coarse piston 62 is located in the first coarse section 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] The first thin section oil cylinder connecting pipe 9 and the second thin section oil cylinder connecting pipe 10 are both installed with valves 13, and the valves 13 are used to control the opening and closing of the first thin section oil cylinder connecting pipe 9 and the second thin section oil cylinder connecting pipe 10.

[0038] The first thin section oil cylinder connecting pipe 9 and the second thin section oil cylinder connecting pipe 10 are both installed with energy storage tanks 14 .

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

[0040] The first vertical oil cylinder A, the second vertical oil 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 trumpet-shaped ports, which enable the hydraulic oil in the first coarse section oil cylinder 3 and the second coarse section oil cylinder 4 to smoothly enter the intermediate connecting pipe 5 .

[0042] like Figure 4 As shown, the port 51 where the first thin section oil cylinder connecting pipe 9 is connected to the first thin section oil cylinder 1 is a trumpet-shaped port; the port 51 where the second thin section oil cylinder connecting pipe 10 is connected to the second thin section oil cylinder 2 is a trumpet-shaped port, which can make the hydraulic oil flow smoothly.

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

[0044] The working process of this embodiment: Cooperate Figures 1 to 4 As shown, when the second piston rod 7 is in the highest position, the oil pump 8 works to pump hydraulic oil to 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. At the same time, the hydraulic oil in the second thick-section oil cylinder 4 enters the second thick-section oil cylinder 3 through the middle connecting pipe 5 under the downward pressure of the second thick piston 72, pushing the first thick piston 62 and then pushing the first piston rod 6 upward, forming a mechanism of dual-cylinder pushing the first piston rod 6, thereby increasing the thrust of pushing the first piston rod 6.

[0045] When the first piston rod 6 is in the highest position, the oil pump 8 works to pump hydraulic oil to the second thin section oil cylinder connecting pipe 10. At this time, the hydraulic oil in the first thin section oil cylinder 1 and the first thin section oil cylinder connecting pipe 9 is pumped to the second thin section oil cylinder 2 through the second thin section oil cylinder connecting pipe 10. The hydraulic oil in the second thin section oil 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. At the same time, the hydraulic oil in the first thick section oil cylinder 3 enters the second thick section oil cylinder 4 through the intermediate connecting pipe 5 under the downward pressure of the first thick piston 62, pushing the second thick piston 72 and then pushing the second piston rod 7 upward, forming a dual-cylinder pushing the second piston rod 7 mechanism, which increases the thrust of pushing the second piston rod 7.

[0046] The oil pump 8 works in a reciprocating manner, thereby driving the well rod 12 of the pumping unit to move up and down to pump oil.

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

Claims

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

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

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

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

5. The energy-saving hydraulic pumping unit according to claim 1, characterized in that: The first vertical oil cylinder (A), the second vertical oil cylinder (B), the oil pump (8) and the power source (15) are installed 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 oil cylinder piston rod (73) is connected to the counterweight (11), and the bottom end of the first thin section oil cylinder piston rod (63) is connected to the well rod (12).

7. The energy-saving hydraulic pumping unit according to claim 1, characterized in that: The bottom ends of the second thin section oil cylinder piston rod (73) and the bottom ends of the first thin section oil 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 trumpet-shaped ports.

9. The energy-saving hydraulic pumping unit according to claim 1, characterized in that: The port (51) through which the first thin section oil cylinder connecting pipe (9) communicates with the first thin section oil cylinder (1) is a trumpet-shaped port; the port (51) through which the second thin section oil cylinder connecting pipe (10) communicates with the second thin section oil cylinder (2) is a trumpet-shaped port.

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