Underground electric miniature plunger pump testing device

Abstract

The utility model provides an underground electric miniature plunger pump testing device which comprises an electric miniature plunger pump, a hydraulic control module, a hydraulic movement module and a buffer tank, and the hydraulic movement module comprises a first three-way valve, a second three-way valve and a double-acting hydraulic cylinder. Oil inlets of two oil cavities of the double-acting hydraulic cylinder are respectively connected with the hydraulic control module through a first three-way valve, and oil outlets of the two oil cavities of the double-acting hydraulic cylinder are respectively connected with the buffer tank through a second three-way valve; the hydraulic control module comprises a valve body, a sealing cover and a test end cover, a valve body cavity is arranged in the valve body, and the electric miniature plunger pump is located in the valve body cavity. According to the utility model, the difference between actual parameters and rated parameters of the electric micro plunger pump can be tested, data support is provided for later use of a model machine, and whether the function of the micro pump is intact can be detected.

Description

TECHNICAL FIELD

[0001] The utility model relates to the detection technology of oil and gas downhole tool, specifically a downhole electric miniature plunger pump testing device. BACKGROUND

[0002] In the oil well exploitation process, it is necessary to use downhole tool to detect the internal environmental parameters of oil well. With the development of technology, the downhole continuous composite pipe cable developed by our company has been gradually applied. In order to adapt to the downhole continuous composite pipe cable, the electric miniature plunger pump needs to be used in the detection of downhole environment. Due to the requirement of working depth, the electric miniature plunger pump lowered into the composite pipe cable must strictly control its quality to avoid failure.

[0003] In order to obtain accurate data and also to ensure product quality, the electric miniature plunger pump is tested before installation, especially the gap between the actual parameters and the rated parameters of the electric miniature plunger pump, which provides data support for the use of prototype in later period, and detects whether the function of the electric miniature plunger pump is intact. It is an effective technical means. However, there is no device for such testing in the prior art. CONTENT OF THE UTILITY MODEL

[0004] In view of the problems pointed out in the background art, the purpose of the utility model is to provide a downhole electric miniature plunger pump testing device to realize the function test of the electric miniature plunger pump.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A downhole electric miniature plunger pump testing device, comprising an electric miniature plunger pump, a hydraulic control module, a hydraulic motion module and a buffer tank, the hydraulic motion module comprises a first three-way valve, a second three-way valve and a double-acting hydraulic cylinder, the oil inlet of the two oil chambers of the double-acting hydraulic cylinder is connected to the hydraulic control module through the first three-way valve, and the oil outlet of the two oil chambers of the double-acting hydraulic cylinder is connected to the buffer tank through the second three-way valve.

[0007] The hydraulic control module comprises a valve body, a sealing cover and a test end cover, the valve body is provided with a valve body cavity, one end of the valve body cavity is connected to the sealing cover, and the other end is connected to the test end cover, the valve body cavity has an oil inlet hole, and the oil inlet hole is connected to the output port of the buffer tank; the sealing cover is provided with a water-tight pin, the electric miniature plunger pump is located in the valve body cavity, and the driving motor thereof is connected to the external control circuit through the water-tight pin; the test end cover is provided with an oil outlet channel, one end of the oil outlet channel is connected to the output end of the electric miniature plunger pump, and the other end is connected to the first three-way valve; the test end cover is also provided with an overflow channel, one end of the overflow channel is communicated with the oil outlet channel, and the other end is connected to an overflow valve; the other end of the overflow valve is connected to the buffer tank.

[0008] The test end cover has a mounting hole, the mounting hole is communicated with an oil outlet channel, and an output end of the electric micro plunger pump is mounted in the mounting hole.

[0009] The test end cover has a first overflow hole and a second overflow hole, the first overflow hole and the second overflow hole are connected with overflow channels respectively, the overflow valve is mounted in the first overflow hole, and the second overflow hole is provided with a plugging screw plug.

[0010] The test end cover is internally provided with a two-position two-way electromagnetic valve, and the two-position two-way electromagnetic valve is used for controlling the on-off of the oil outlet channel.

[0011] The oil inlet hole is connected with the buffer tank through a supply pipe, the supply pipe is provided with a first filtering mechanism, the second three-way valve is connected with the buffer tank through a return pipe, the return pipe is provided with a second filtering mechanism, and the first filtering mechanism and the second filtering mechanism are both small filters with a filtering precision of 10 microns.

[0012] The first three-way valve and the second three-way valve are both three-way electromagnetic valves.

[0013] The electric micro plunger pump can be tested, and the difference between actual parameters and rated parameters of the electric micro plunger pump can be tested, data support is provided for later prototype use, the function of the micro pump can be detected, the device can be repeatedly used as a load device for providing axial pressure, and preparation is made for later pressure testing work. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a perspective view of the overall structure of the utility model.

[0015] Figure 2 It is a top view of the overall structure of the utility model.

[0016] Figure 3 It is a front view of the hydraulic control module.

[0017] Figure 4 It is a first action mode view of the hydraulic movement module.

[0018] Figure 5 It is a second action mode view of the hydraulic movement module.

[0019] In the drawing, 1 is a first three-way valve, 2 is a second three-way valve, 3 is a double-acting hydraulic cylinder, 4 is a buffer tank, 5 is an electric micro plunger pump, 6 is a valve body, 7 is a sealing cover, 8 is a test end cover, 9 is an oil inlet hole, 10 is a water-tight pin, 11 is a valve body cavity, 12 is an overflow valve, 13 is a plugging screw plug, 14 is a two-position two-way electromagnetic valve, 15 is a second filtering mechanism, 16 is an oil outlet channel, and 17 is a first filtering mechanism. DETAILED DESCRIPTION

[0020] The utility model will be further explained in detail below in combination with the drawings and specific embodiments of the specification.

[0021] Specifically, the electric micro-plunger pump 5 suitable for the utility model is shown in the figure Figure 3 The electric micro-plunger pump 5 is prior art, which comprises a pump body and a driving motor arranged integrally, and will not be described in detail, and the output end of the electric micro-plunger pump 5 in the utility model refers to the output port of the pump body.

[0022] As shown in Figures 1-3 The utility model discloses an electric micro-plunger pump testing device for underground, including electric micro-plunger pump 5, hydraulic control module, hydraulic movement module and buffer tank 4, the hydraulic movement module includes first three-way valve 1, second three-way valve 2 and double-acting hydraulic cylinder 3, and the oil inlet of two oil chambers of double-acting hydraulic cylinder 3 is connected with hydraulic control module through first three-way valve 1 respectively, and the oil outlet of two oil chambers of double-acting hydraulic cylinder 3 is connected with buffer tank 4 through second three-way valve 2 respectively;The hydraulic control module includes valve body 6, sealing cover 7 and test end cover 8, is equipped with valve body cavity 11 in valve body 6, one end of valve body cavity 11 is connected with sealing cover 7, the other end is connected with test end cover 8, valve body cavity 11 has oil inlet hole 9, and oil inlet hole 9 is connected with the output port of buffer tank 4;The sealing cover 7 is installed with water-tight pin 10, and the electric micro-plunger pump 5 is located in valve body cavity 11, and its driving motor is connected with external control circuit through water-tight pin 10;Test end cover 8 is equipped with oil outlet channel 16 in, one end of oil outlet channel 16 is connected with the output end of electric micro-plunger pump 5, and the other end is connected with first three-way valve 1;Test end cover 8 is also equipped with overflow channel, and one end of overflow channel is communicated with oil outlet channel 16, and the other end is connected with overflow valve 12;The other end of overflow valve 12 is connected with buffer tank 4.The two-position two-way electromagnetic valve 14 is built in test end cover 8, and the on-off of oil outlet channel 16 is controlled by two-position two-way electromagnetic valve 14.Specifically, valve body cavity 11 is connected with sealing cover 7 and test end cover 8 respectively by screw threads and is sealed.

[0023] The action principle of the utility model is as follows:

[0024] (1) low-pressure oil sets out from buffer tank 4, reaches hydraulic control module through first filter mechanism 17, and enters valve body cavity 11 through oil inlet hole 9.

[0025] (2) The hydraulic control module controls the speed of the driving motor of the electric micro-plunger pump 5 through an external control circuit, and then the driving motor drives the pump body of the electric micro-plunger pump 5 to perform pressurization operation. The external control circuit is connected with the driving motor through a plurality of watertight pins 10 on the sealing cover 7, which ensures effective connection of the circuit and also ensures the reliability of the sealing of the equipment. The electric micro-plunger pump 5 is driven by the driving motor to inject 21 MPa high-pressure oil into the oil outlet channel 16, which leads to the two-position two-way electromagnetic valve 14 and the overflow valve 12. The two-position two-way electromagnetic valve 14 is controlled by external electricity to realize the delivery of high-pressure oil to the hydraulic movement module, to provide power for the hydraulic movement module, so as to control the movement of the hydraulic movement module. When the device circuit is blocked and the valve body cavity 11 pressure increases, the overflow valve 12 will relieve the pressure of the device, and the excess hydraulic oil will be returned to the buffer tank 4 through the overflow oil return pipeline.

[0026] (3) After the high-pressure oil is discharged from the hydraulic control module, it enters the hydraulic movement module through the first three-way valve 1 as shown in Figure 2 The first three-way valve 1 controls the high-pressure oil to enter the oil chamber on one side of the piston for pressurization, and the second three-way valve 2 controls the hydraulic oil on one side of the piston to flow out for pressure relief. As shown in Figure 4 Action mode one: the first three-way valve 1 is opened on the right upper side and closed on the right lower side, and the second three-way valve 2 is closed on the left upper side and opened on the left lower side, the high-pressure oil enters the upper oil chamber of the piston, and the piston connecting rod is pushed downward (indicated by the red arrow), and the low-pressure oil in the lower oil chamber of the piston flows outward to the second filtering mechanism 15; as shown in Figure 5 Action mode two: the first three-way valve 1 is closed on the right upper side and opened on the right lower side, and the second three-way valve 2 is opened on the left upper side and closed on the left lower side, the high-pressure oil enters the lower oil chamber of the piston, and the piston connecting rod is pushed upward (indicated by the red arrow), and the low-pressure oil in the upper oil chamber of the piston flows outward to the second filtering mechanism 15.

[0027] (4) After the low-pressure oil is discharged from the hydraulic movement module, it enters the second filtering mechanism 15 and flows back to the oil storage buffer tank after being filtered.

[0028] The test principle of the utility model is as follows: first, set an electric micro-plunger pump 5 that has passed strict electrical test as a standard part, record the piston stroke of the hydraulic movement module after test; for the electric micro-plunger pump 5 to be tested, input the same voltage and current, respectively test the piston stroke and speed of the hydraulic movement module, so as to judge whether the performance of the measured electric micro-plunger pump 5 meets the requirements. The bidirectional control hydraulic movement module can save test time and improve test efficiency.

[0029] The test end cover 8 has a mounting hole, the mounting hole is communicated with the oil outlet channel 16, and the output end of the electric micro-plunger pump 5 is installed in the mounting hole. Specifically, the output end pipe of the electric micro-plunger pump 5 is threadedly connected with the mounting hole.

[0030] The test end cover 8 has a first overflow hole and a second overflow hole, the first overflow hole and the second overflow hole are connected with overflow channels respectively, the overflow valve 12 is installed inside the first overflow hole, and the second overflow hole is provided with a plugging plug 13.

[0031] The oil inlet hole 9 is connected with the buffer tank 4 through an oil supply pipe, the oil supply pipe is provided with a first filtering mechanism 17; the second three-way valve 2 is connected with the buffer tank 4 through a backflow pipe, the backflow pipe is provided with a filtering mechanism 15, and the first filtering mechanism 17 and the second filtering mechanism 15 are all small filters with a filtering precision of 10 microns.

[0032] The first three-way valve 1 and the second three-way valve 2 are all three-way electromagnetic valves.

[0033] The part not described in detail in the utility model is prior art.

Claims

1. An electric micro-plunger pump testing device for downhole use, comprising an electric micro-plunger pump (5), a hydraulic control module, a hydraulic movement module and a buffer tank (4), characterized in that: The hydraulic movement module comprises a first three-way valve (1), a second three-way valve (2) and a double-acting hydraulic cylinder (3), the oil inlets of the two oil chambers of the double-acting hydraulic cylinder (3) are connected to the hydraulic control module through the first three-way valve (1), and the oil outlets of the two oil chambers of the double-acting hydraulic cylinder (3) are connected to the buffer tank (4) through the second three-way valve (2). The hydraulic control module comprises a valve body (6), a sealing cover (7) and a test end cover (8), the valve body (6) is provided with a valve body cavity (11), one end of the valve body cavity (11) is connected to the sealing cover (7), the other end is connected to the test end cover (8), the valve body cavity (11) is provided with an oil inlet hole (9), the oil inlet hole (9) is connected to the outlet of the buffer tank (4); the sealing cover (7) is provided with a water-tight pin (10), the electric micro-plunger pump (5) is located in the valve body cavity (11), and the driving motor is connected to the external control circuit through the water-tight pin (10); the test end cover (8) is provided with an oil outlet channel (16), one end of the oil outlet channel (16) is connected to the output end of the electric micro-plunger pump (5), and the other end is connected to the first three-way valve (1); the test end cover (8) is further provided with an overflow channel, one end of the overflow channel is communicated with the oil outlet channel (16), and the other end is connected to the overflow valve (12); the other end of the overflow valve (12) is connected to the buffer tank (4).

2. A downhole electrically powered miniature plunger pump test device according to claim 1, characterised in that: The test end cover (8) is provided with a mounting hole, the mounting hole is communicated with the oil outlet channel (16), and the output end of the electric micro-plunger pump (5) is mounted in the mounting hole.

3. A downhole electrically powered miniature plunger pump test device according to claim 2, characterised in that: The test end cover (8) is provided with a first overflow hole and a second overflow hole, the first overflow hole and the second overflow hole are connected to the overflow channel respectively, the overflow valve (12) is mounted in the first overflow hole, and the second overflow hole is provided with a plugging screw plug (13).

4. The electrically powered miniature plunger pump test device for downhole use of claim 1, wherein: The test end cover (8) is provided with a two-position two-way electromagnetic valve (14), and the two-position two-way electromagnetic valve (14) controls the opening and closing of the oil outlet channel (16).

5. The electrically powered miniature plunger pump test device for downhole use of claim 1, wherein: The oil inlet hole (9) is connected to the buffer tank (4) through a supply pipe, and the supply pipe is provided with a first filtering mechanism (17); the second three-way valve (2) is connected to the buffer tank (4) through a return pipe, and the return pipe is provided with a second filtering mechanism (15); the first filtering mechanism (17) and the second filtering mechanism (15) are both small filters with a filtering precision of 10 microns.

6. The electrically powered miniature plunger pump test device for downhole use of claim 1, wherein: The first three-way valve (1) and the second three-way valve (2) are both three-way electromagnetic valves.

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