Deep well electric plunger submersible pump

Abstract

The invention belongs to the technical field of mining wells for petroleum, terrestrial heat, in-situ leaching uranium mining and the like, and particularly relates to a deep well electric plunger submersible pump. The deep well electric plunger submersible pump comprises a plunger pump, a linear electric cylinder is arranged below the plunger pump, a connector is arranged between the plunger pump and the linear electric cylinder, and an electric cylinder cable is arranged below the linear electric cylinder. The plunger pump has the advantages that reciprocating power is output through the linear electric cylinder to drive the plunger of the plunger pump to perform reciprocating water pumping, the plunger pump is essentially a plunger pump and has the advantage of being high in lift, and the lift can reach 1000 m or above; and when the medium is turbid and the sand content is high, the water pumping effect and the service life of the pump are not influenced (unlike a multi-stage centrifugal submersible pump is easy to clamp and damage when the sand content is high).

Description

Technical Field

[0001] The invention belongs to the technical field of mining wells such as petroleum, geothermal, in-situ leaching uranium, etc., and specifically relates to a deep well electric plunger submersible pump. Background Art

[0002] At present, the main pumping equipment for oil wells is a beam pump. This pump is pulled by ground equipment to move the sucker rod (generally hundreds to thousands of meters) installed in the oil pipe in the well back and forth, thereby driving the plunger in the pump connected to the lower end of the sucker rod to move up and down to pump oil. The advantages of this pump are high head and strong adaptability to the sand content of the medium. Its disadvantages are: first, the useless energy consumption is very large, because the pumping motor must first overcome the gravity of hundreds to even thousands of meters of sucker rods to do work, which is useless work, and the only useful part is to push the plunger up and down to pump oil; second, a set of equipment (beam pump) must be installed at the wellhead. For geothermal wells or in-situ leaching uranium wells, the pumping equipment mainly uses multi-stage centrifugal submersible pumps. The advantage of this pump is that there is no equipment at the surface wellhead, and the disadvantage is that the head is small (generally <400m), which cannot meet the needs of deep wells, and the adaptability to the sand content of water is poor. When the sand content of the solution is high, it is easy to be damaged. Summary of the invention

[0003] The present invention aims at the defects of the prior art and provides a deep well electric plunger submersible pump.

[0004] The present invention is implemented as follows: a deep well electric plunger submersible pump, which includes a plunger pump, a linear electric cylinder is arranged below the plunger pump, a connector is arranged between the plunger pump and the linear electric cylinder, and an electric cylinder cable is arranged below the linear electric cylinder.

[0005] In the deep well electric plunger submersible pump as described above, the plunger pull rod of the plunger pump extends into the connector, the electric cylinder push rod of the linear electric cylinder also extends into the connector, and the plunger pull rod and the electric cylinder push rod are connected via a coupling sleeve.

[0006] A deep well electric plunger submersible pump as described above, wherein a plunger is arranged in the cylinder cavity of the plunger pump, a through hole is arranged in the plunger, a valve seat is arranged on the through hole, a steel ball cover is arranged on the valve seat, a steel ball is arranged in the steel ball cover, the through hole is connected with the water channel in the plunger pump, and is connected with the outside through the water inlet.

[0007] A deep well electric plunger submersible pump as described above, wherein a water outlet pipe head is arranged at the top of the plunger pump.

[0008] In the deep well electric plunger submersible pump as described above, a female thread is arranged on the coupling sleeve, and male threads are arranged on the plunger pull rod and the electric cylinder push rod.

[0009] The remarkable effects of the present invention are: the power of reciprocating motion is output by the linear electric cylinder to drive the plunger of the plunger pump to do reciprocating motion to pump water. It is essentially a plunger pump, which has the characteristics of high head of the plunger pump, and the head can reach more than 1000m; its plunger is directly driven by the integrated electric cylinder, so the useless energy consumption is very small, unlike the current oil well pumping unit that does a lot of useless work (from the ground walking beam, connecting rod (sucker rod) to the downhole plunger pump plunger, thereby dragging the plunger to reciprocate), and there is no equipment at the ground wellhead (unlike the oil well that needs a nodding machine), and there is only a pumping pipe and a cable in the well; even when the medium is turbid and the sand content is high, it does not affect its pumping effect and service life (unlike the multi-stage centrifugal submersible pump that is easily clamped and damaged when the sand content is high). BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 Overall structure diagram of a deep well electric plunger submersible pump

[0011] Figure 2 Internal structure of a deep well electric plunger submersible pump

[0012] Figure 3 Working principle diagram of a deep well electric plunger submersible pump

[0013] In the figure: 1 plunger pump, 2 connector, 3 linear electric cylinder, 4 electric cylinder cable, 5 electric cylinder push rod, 6 coupling sleeve, 7 plunger pull rod, 8 water inlet, 9 water outlet pipe head, 10 steel ball cover, 11 steel ball, 12 valve seat, 13 plunger, 14 water inlet, 15 cylinder cavity, 16 external cable, 17 infusion pipe, 18 water (oil) well, 19 water (oil level), 20 deep well electric plunger submersible pump. DETAILED DESCRIPTION

[0014] The plunger pump 1 is a reducer with a water outlet pipe head 9 at the center of the upper end surface. The tube with a larger diameter at the lower part is a cylinder, which contains a piston 13, a steel ball cover 10 installed at the upper end of the piston 13, a valve seat 12, a steel ball 11 and a piston rod 7 installed at the center of the lower end of the piston 13. The lower end of the plunger pump 1 has a male thread for connecting with the female thread of the connector 2.

[0015] Connector 2: It is a short tube with female threads at both ends, and four square holes (water inlet 8) are evenly distributed on the circumference of the middle part of the side.

[0016] Linear electric cylinder 3: The whole is cylindrical, with an electric cylinder push rod 5 installed at the center of the upper end surface, and an electric cylinder cable 4 leading out of the lower end surface. The linear electric cylinder is composed of a cylinder body, a servo motor, a servo driver, a ball screw and an electric cylinder push rod 5.

[0017] Electric cylinder cable 4: It is led out from the lower end of the linear electric cylinder 3 to supply power to the servo motor in the linear electric cylinder 3.

[0018] Electric cylinder push rod 5: A cylindrical rod with a male thread (for connecting with the female thread of the coupling sleeve 6) at its upper end, which is driven by a servo motor to perform linear reciprocating motion.

[0019] Coupling sleeve 6: a pipe clamp with female threads at both ends.

[0020] The plunger pull rod 7 is a cylindrical rod with male threads at both ends.

[0021] The water inlet 8 is a square hole, and there are 4 of them, evenly distributed on the circumference of the middle part of the connecting pipe 2.

[0022] The water outlet 9 is a round tube, which is located at the upper end of the plunger pump 1 and is integrated with the plunger pump 1 and is used to be connected to the infusion tube 18 at the upper end.

[0023] The steel ball cover 10 is an inverted cup-shaped circular cage with a bottom at the upper end, which is welded to the valve seat 12 on the upper end surface of the plunger 13 and is used to limit the movement range of the steel ball 11.

[0024] Steel ball 11: used for opening and closing valve seat 12.

[0025] The valve seat 12 is a truncated cone with a circular hole inside, with a large outer diameter at the upper end and a small outer diameter at the lower end, and is used to form a valve in combination with a steel ball.

[0026] The plunger 13 has a cylindrical appearance, with a truncated cone hole for installing the valve seat 12 in the middle of the upper part, a round hole (with a female thread) for connecting the plunger pull rod 15 in the middle of the lower part, and four water channels 14 evenly distributed in the plunger body.

[0027] Water channels 14: There are four water channels 14, which are evenly distributed in the plunger 13, penetrate the plunger body obliquely upward from the lower end surface of the plunger 13, and communicate with the upper valve seat hole.

[0028] Cylinder chamber 15: a cylindrical cavity used for the movement of the plunger.

[0029] The installation and use process of the device of the present invention is roughly as follows:

[0030] Step 1: Connect the water lifting pipe 16 to the water outlet pipe head 9 of the linear electric cylinder plunger pump, and connect the external cable 16 to the cable 4 of the linear electric cylinder plunger pump.

[0031] Step 2: Install the linear electric cylinder plunger pump connected with the infusion tube and cable below the liquid level in the water (oil) well.

[0032] Step 3: Turn on the power to pump water (oil). At this time, the servo motor in the linear electric cylinder 3 starts to rotate, driving the electric cylinder push rod 5 to reciprocate up and down, outputting push and pull forces. The reciprocating electric cylinder push rod 5 drags the plunger 13 to reciprocate up and down in the cylinder cavity 15 through the coupling sleeve 6 and the plunger pull rod 7. When the plunger 13 moves downward, the water pressure at the bottom of the plunger 13 is greater than the water pressure at the top. At this time, the water (oil) in the well enters the valve seat 12 through the water inlet 8 and the waterway 14, the steel ball 11 is lifted up by the water, and the water enters the cylinder chamber 15; when the plunger 13 moves upward, the water pressure at the top of the plunger 13 is greater than the water pressure at the bottom. At this time, the steel ball 11 falls to seal the water hole of the valve seat 12, so that the water in the cylinder chamber 15 does not leak, and is pumped into the infusion pipe 17 from the cylinder chamber 15 through the water outlet head 9 under the upward push of the plunger 13; the plunger 13 continuously reciprocates up and down, and the water (oil) in the well will be continuously transported to the ground through the water inlet 8→waterway 14→valve seat 12→cylinder chamber 15→water outlet head 9 and infusion pipe 17.

Claims

1. A deep well electric plunger submersible pump, characterized in that: The invention comprises a plunger pump (1), a linear electric cylinder (3) is arranged below the plunger pump (1), a connector (2) is arranged between the plunger pump (1) and the linear electric cylinder (3), and an electric cylinder cable (4) is arranged below the linear electric cylinder (3).

2. A deep well electric plunger submersible pump as claimed in claim 1, characterized in that: The plunger pull rod (7) of the plunger pump (1) extends into the connector (2), and the electric cylinder push rod (5) of the linear electric cylinder (3) also extends into the connector (2). The plunger pull rod (7) and the electric cylinder push rod (5) are connected via a coupling sleeve (6).

3. A deep well electric plunger submersible pump as claimed in claim 2, characterized in that: A plunger (13) is arranged in a cylinder chamber (15) of a plunger pump (1), a through hole is arranged in the plunger (13), a valve seat (12) is arranged on the through hole, a steel ball cover (10) is arranged on the valve seat (12), a steel ball (11) is arranged in the steel ball cover (10), and the through hole is communicated with a water channel (14) in the plunger pump (1) and is communicated with the outside through a water inlet (8).

4. A deep well electric plunger submersible pump as claimed in claim 3, characterized in that: A water outlet pipe head (9) is arranged at the top end of the plunger pump (1).

5. A deep well electric plunger submersible pump as claimed in claim 4, characterized in that: The coupling sleeve (6) is provided with a female thread, and the plunger pull rod (7) and the electric cylinder push rod (5) are both provided with a male thread.

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