Pump testing and leakage detecting device for hydraulic rodless tubular pump and testing method of pump testing and leakage detecting device

Abstract

The invention relates to a hydraulic rodless tubular pump testing and leakage detecting device which comprises a power liquid water tank, a hydraulic rodless tubular pump set is arranged on one side of the power liquid water tank, a wellhead connecting device is arranged at the top end of the hydraulic rodless tubular pump set, and the wellhead connecting device is connected with the power liquid water tank through a high-pressure connecting assembly. A liquid level metering barrel is arranged at the bottom end of the hydraulic rodless tubular pump set, and the bottom end of the hydraulic rodless tubular pump set is communicated with liquid in the liquid level metering barrel. When the hydraulic rodless tubular pump drainage and mining system detects the pump, the hydraulic rodless tubular pump drainage and mining system can be subjected to pump testing work in a laboratory and can also be subjected to pump testing work on an operation site.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coalbed methane exploration and development, and particularly relates to a hydraulic rodless pipe pump test pumping leak detection device and a test method thereof. BACKGROUND

[0002] The domestic coalbed methane drainage and gas production process has been using a rod drainage and production process. The rod drainage and production process system does not completely support emerging drilling technologies such as inclined wells and horizontal wells, and even cannot produce normally. The hydraulic rodless pipe pump drainage and production system solves the above problems by replacing the traditional rod drainage and production process.

[0003] When the hydraulic rodless pipe pump drainage and production system is tested, the hydraulic rodless pipe pump (downhole pump) needs to be tested. The test refers to the simulation of the ground before pumping into the well to test whether the pump working condition meets the requirements.

[0004] The commonly used method is to use a special high-pressure power liquid device to connect the hydraulic rodless pipe pump (downhole pump set) through the coalbed methane wellhead to test the pump.

[0005] The above method is not only complicated to disassemble and assemble, but also has a large equipment volume and heavy equipment components, and cannot be applied on a large scale in the operation site. The hydraulic rodless pipe pump test affects the time and quality of the operation pump testing. With the large-scale application of the hydraulic rodless pipe pump drainage and production process in coalbed methane development, this problem is highlighted, which restricts the promotion of the hydraulic rodless pipe pump drainage and production process. SUMMARY

[0006] In order to make the hydraulic rodless pipe pump drainage and production system testing operation can be carried out in the laboratory and on the operation site, the present application provides a hydraulic rodless pipe pump test pumping leak detection device and a test method thereof.

[0007] The hydraulic rodless pipe pump test pumping leak detection device provided by the present application adopts the following technical scheme:

[0008] A hydraulic rodless pipe pump test pumping leak detection device comprises a power liquid tank, a hydraulic rodless pipe pump set is arranged on one side of the power liquid tank, a wellhead connecting device is arranged at the top end of the hydraulic rodless pipe pump set, a non-polar seal assembly is arranged between the wellhead connecting device (3) and the central pipe of the hydraulic rodless pipe set, the wellhead connecting device and the power liquid tank are connected through a high-pressure connecting assembly, a liquid level measuring barrel is arranged at the bottom end of the hydraulic rodless pipe pump set, and the bottom end of the hydraulic rodless pipe pump set is in communication with the liquid in the liquid level measuring barrel.

[0009] By adopting the technical scheme, the inside of the power liquid water tank is connected with the hydraulic rodless pipe pump set through the high-pressure connecting assembly and the inlet connecting device, the hydraulic rodless pipe pump set is driven by the power liquid water tank to alternately press the downhole pump set, the movable cylinder piston in the pump set is driven to perform pumping and discharging movement, the liquid in the liquid level measuring barrel is pumped, the ratio of the liquid level drop in the liquid level measuring barrel to the theoretical displacement can calculate the pump efficiency and the leakage, and the hydraulic rodless pipe pump displacement system can perform pump testing in the laboratory and on the operation site.

[0010] Optionally, the wellhead connecting device comprises a tubing joint, the tubing joint comprises a first connecting part and a second connecting part, the inside of the first connecting part and the second connecting part is connected, a flow divider is coaxially connected to the inside of one end of the first connecting part, one end of the first connecting part with the flow divider is connected with the top end of the hydraulic rodless pipe pump set, the other end of the first connecting part is connected with the high-pressure connecting assembly, and one end of the second connecting part away from the first connecting part is connected with the high-pressure connecting assembly.

[0011] Optionally, an adjustable central tube plug is coaxially arranged in the inside of the tubing joint, one end of the adjustable central tube plug is threadedly connected with the flow divider, one end of the tubing joint provided with the flow divider is threadedly connected with the top end of the hydraulic rodless pipe pump set, and one end of the adjustable central tube with the flow divider is connected with the central tube port in the inside of the hydraulic rodless pipe pump set.

[0012] Optionally, a through hole is arranged in the end wall of the flow divider, the through hole is arranged along the axial direction of the flow divider, and the through hole penetrates the two end walls of the flow divider.

[0013] Optionally, the high-pressure connecting assembly comprises a first high-pressure hose and a second high-pressure hose, one end of the first high-pressure hose is connected with the inside of the power liquid water tank, the other end of the first high-pressure hose is connected with one end of the adjustable central tube plug away from the hydraulic rodless pipe pump set, one end of the second high-pressure hose is connected with the inside of the power liquid water tank, and the other end of the second high-pressure hose is connected with the second connecting part.

[0014] Optionally, the adjustable central tube plug comprises a cone-shaped end connected with the flow divider and a central tube pressure source interface end away from the flow divider, the cone-shaped end is provided with a sealing assembly, and the central tube pressure source interface end is provided with a sealing assembly.

[0015] Optionally, the bottom end of the hydraulic rodless tube pump group is provided with a pump suction inlet connector, one end of the pump suction inlet connector is threadedly connected with the hydraulic rodless tube pump group, and the other end of the pump suction inlet connector is fixedly connected with a rubber pipe which extends into the inside of the liquid level measuring barrel.

[0016] Optionally, the pump suction inlet connector comprises a large-diameter end and a small-diameter end, the inner diameter of the large-diameter end is larger than the inner diameter of the small-diameter end, the inner side wall of the large-diameter end is threadedly connected with the hydraulic rodless tube pump group, and the outer side wall of the small-diameter end is threadedly connected with the rubber pipe.

[0017] The application also provides a test method, which is characterized by being applied to the hydraulic rodless tube pump leak testing device, and the method comprises the following steps:

[0018] S01: the wellhead connecting device is connected with the interface at the top of the hydraulic rodless tube pump group, the pump suction inlet connector is connected with the bottom of the hydraulic rodless tube pump group, the power liquid tank is connected with the wellhead connecting device through the high-pressure connecting assembly, and finally the liquid level measuring barrel is filled with water, and the pump suction inlet connector is connected with the water in the liquid level measuring barrel through the rubber pipe;

[0019] S02: the hydraulic rodless tube pump group is tested for leakage by leak testing or verifying pump efficiency.

[0020] Optionally, in S02, the leak testing comprises the following steps:

[0021] S021: central pipe leak testing: the connection between the central pipe of the hydraulic rodless tube pump group and the first high-pressure hose of the power liquid tank is cancelled, the connection of the second high-pressure hose of the hydraulic rodless tube pump group is opened, the tubing is pressurized to 20 MPa, and after the pressure is stabilized, the water output is less than 100 ml / min, which is qualified;

[0022] fixed valve leak testing: the connection between the central pipe of the hydraulic rodless tube pump group and the first high-pressure hose of the power liquid tank is closed, the connection of the second high-pressure hose of the hydraulic rodless tube pump group is opened, the tubing is pressurized to 20 MPa, and after the pressure is stabilized, the liquid inlet valve of the tubing is closed to observe the pressure drop, and the pressure drop is less than or equal to 0.1 MPa within 10 min, which is qualified;

[0023] In S02, the verification of pump efficiency comprises the following steps:

[0024] S022: the power liquid tank is started to generate high-pressure power liquid, the high-pressure power liquid is delivered to the wellhead connecting device through the high-pressure connecting assembly, the wellhead connecting device is connected with the central pipe and the tubing joint of the hydraulic rodless tube pump group, respectively, the high-pressure power liquid is alternately pressurized from the central pipe and the tubing joint to the downhole pump group, the high-pressure power liquid drives the cylinder piston in the hydraulic rodless tube pump group to move for pumping, and the water in the liquid level measuring barrel is pumped.

[0025] The pump efficiency and leakage amount can be calculated by measuring the ratio of the liquid level drop in the liquid level measuring barrel to the theoretical displacement.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. Compared with the original wellhead connecting device, the volume is only 1 / 4 of the original wellhead device, and the weight is also reduced to 1 / 3 of the original wellhead device, and a screw connection is adopted, which eliminates the cumbersome screw connection operation.

[0028] 2. The vertebral body end of the adjustable central tube plug is provided with a variable diameter structure, and the end of the vertebral body end is a small diameter structure, and the central position of the vertebral body end is a large diameter structure, and when the vertebral body end of the adjustable central tube plug is inserted into the central tube of the hydraulic rodless pipe type pump group, when the diameter of the central tube of the hydraulic rodless pipe type pump group is small, the small diameter end of the vertebral body end is sealingly connected, and when the diameter of the central tube of the hydraulic rodless pipe type pump group is large, the large diameter end of the vertebral body end is sealingly connected, so that the variable diameter vertebral body end can be adapted to the diameter of the central tube of the hydraulic rodless pipe type pump group.

[0029] 2. The problems of the central tube plug, the oil pipe joint and the connection with the pump are solved. The original wellhead device requires multiple people to cooperate to complete the installation, and the present device only needs one person to operate and one person to cooperate to complete the disassembly and assembly.

[0030] 3. The high-pressure connecting hose is a threaded pipe, and the pipe head is provided with a safety rope to prevent the pipe head from falling off, thereby enhancing the safety of the pump test operation.

[0031] 4. A liquid level measuring barrel is designed, and the pump efficiency can be directly observed by the ratio of the actual liquid level suction amount to the theoretical displacement of the pump. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a schematic diagram of the overall structure of a hydraulic rodless pipe type pump test and leakage detection device in an embodiment of the present application.

[0033] Figure 2 is a schematic diagram of the structure at the position of the hydraulic rodless pipe type pump group of a hydraulic rodless pipe type pump test and leakage detection device in an embodiment of the present application.

[0034] Figure 3 is a schematic diagram of the structure at the position of the oil pipe joint of a hydraulic rodless pipe type pump test and leakage detection device in an embodiment of the present application.

[0035] Figure 4 is an exploded view of the oil pipe joint of a hydraulic rodless pipe type pump test and leakage detection device in an embodiment of the present application.

[0036] Figure 5This is a cross-sectional view of the oil pipe joint of a hydraulic rodless tubular pump testing and leak detection device according to an embodiment of this application.

[0037] Figure 6 This is a schematic diagram of the pump inlet connector of a hydraulic rodless tubular pump testing and leak detection device according to an embodiment of this application.

[0038] Explanation of reference numerals in the attached drawings: 1. Power fluid tank; 2. Hydraulic rodless tubular pump set; 3. Wellhead connection device; 31. Oil pipe joint; 311. First connection part; 3111. First connection end; 3112. Second connection end; 312. Second connection part; 32. Diverter; 321. Through hole; 33. Adjustable center tube plug; 331. Conical end; 332. Center tube pressure source interface end; 333. First sealing groove; 3331. First sealing ring; 334. Second sealing groove; 3341. Second sealing ring; 4. High-pressure connection assembly; 41. First high-pressure hose; 42. Second high-pressure hose; 5. Liquid level metering tank; 6. Pump suction inlet connector; 61. Large diameter end; 62. Small diameter end; 63. Force-adding hexagonal structure. Detailed Implementation

[0039] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0040] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0041] The following is in conjunction with the appendix Figures 1-6 This application will be described in further detail.

[0042] This application discloses a pump testing and leak detection device for a hydraulic rodless tubular pump. (Refer to...) Figure 1 , Figure 2 A hydraulic rodless tubular pump testing and leak detection device includes a power fluid tank 1, a hydraulic rodless tubular pump unit 2 located on one side of the power fluid tank 1, a wellhead connection device 3 at the top of the hydraulic rodless tubular pump unit 2, a stepless sealing component between the wellhead connection device 3 and the hydraulic rodless tubular pump unit 2, the stepless sealing component can seal according to the different diameter specifications of the central pipe of the hydraulic rodless tubular pump unit 2, the wellhead connection device 3 and the power fluid tank 1 are connected to each other through a high-pressure connection component 4, and a liquid level measuring tank 5 is also provided at the bottom of the hydraulic rodless tubular pump unit 2, the bottom of the hydraulic rodless tubular pump unit 2 is in communication with the liquid inside the liquid level measuring tank 5.

[0043] The power liquid water tank 1 stores power liquid inside, and a high-pressure connecting assembly 4 is arranged inside the power liquid water tank 1, through which the power liquid inside the power liquid water tank 1 can be supplied outwards.

[0044] With reference to Figure 3 , Figure 4 The wellhead connecting device 3 comprises a tubing joint 31, which comprises a first connecting part 311 and a second connecting part 312. The first connecting part 311 is in a tubular structure, and the second connecting part 312 is also in a tubular structure. The axis of the first connecting part 311 is the same as the axis of the hydraulic rodless pipe pump set 2, and the axis of the second connecting part 312 is perpendicular to the axis of the first connecting part 311. The first connecting part 311 and the second connecting part 312 are fixedly connected, and the inside of the first connecting part 311 is in communication with the inside of the second connecting part 312.

[0045] The first connecting part 311 comprises a first connecting end 3111 and a second connecting end 3112. The first connecting end 3111 of the first connecting part 311 is provided with internal and external threads, and the outer side of the end of the second connecting part 312 away from the first connecting part 311 is provided with threads. The first connecting end 3111 of the first connecting part 311 is internally threadedly connected with a flow divider 32. The flow divider 32 is in a tubular structure, coaxially arranged with the first connecting part 311, and the outer side wall of the flow divider 32 is threadedly connected with the inner side wall of the first connecting part 311. A through hole 321 is horizontally arranged on the end wall of the flow divider 32, and the through hole 321 penetrates through both ends of the flow divider 32. Multiple through holes 321 are equidistantly arranged along the circumference of the flow divider 32.

[0046] The adjustable central pipe plug 33 is horizontally arranged inside the tubing joint 31, and the adjustable central pipe plug 33 is coaxially arranged with the first connecting part 311 of the tubing joint 31. The adjustable central pipe plug 33 includes a vertebral end 331 and a central pipe pressure source interface end 332. The endless seal assembly includes a vertebral structure arranged on one side of the vertebral end 331. The diameter of the vertebral structure increases from one end close to the end wall of the vertebral end 331 to one end close to the center of the adjustable central pipe plug 33. The one end of the vertebral end 331 of the adjustable central pipe plug 33 extends into the inside of the tubing joint 31, and the one end of the vertebral end 331 of the adjustable central pipe plug 33 extends out of the inside of the flow divider 32 and seals with the central pipe inside the hydraulic rodless pipe pump set 2. Since the diameter of the vertebral structure is expanded, when the diameter of the central pipe of the hydraulic rodless pipe pump set 2 is small, the front end of the vertebral structure can be connected and sealed, and when the diameter of the central pipe of the hydraulic rodless pipe pump set 2 is large, the large-diameter end of the vertebral structure is connected and sealed, so that the vertebral end 331 can adapt to the diameters of the central pipes of the hydraulic rodless pipe pump set 2 of different diameters, and the adjustable central pipe plug 33 is threadedly connected with the inside of the flow divider 32. The central pipe pressure source interface end 332 of the adjustable central pipe plug 33 extends out of the inside of the tubing joint 31.

[0047] Referring to Figure 4 , Figure 5 , a first sealing groove 333 is arranged on the outer side wall of the vertebral end 331 of the adjustable central pipe plug 33, the first sealing groove 333 is an annular groove body, and a first sealing ring 3331 is arranged inside the first sealing groove 333. A second sealing groove 334 is arranged on the outer side wall of the central pipe pressure source interface end 332 of the adjustable central pipe plug 33, the second sealing groove 334 is an annular groove body, and a second sealing ring 3341 is arranged inside the second sealing groove 334.

[0048] The first connecting end 3111 of the tubing joint 31 is coaxially arranged with the hydraulic rodless pipe pump set 2 and is threadedly connected with the hydraulic rodless pipe pump set 2. The vertebral end 331 of the adjustable central pipe plug 33 inside the tubing joint 31 is connected with the central pipe inside the hydraulic rodless pipe pump set 2.

[0049] Referring to Figure 1 , Figure 3The high-pressure connection assembly 4 includes a first high-pressure hose 41 and a second high-pressure hose 42. The pressure resistance of the first high-pressure hose 41 and the second high-pressure hose 42 is greater than 25 MPa. The joints of the first high-pressure hose 41 and the second high-pressure hose 42 are equipped with anti-detachment safety ropes. One end of the first high-pressure hose 41 is in relative communication with the interior of the power hydraulic water tank 1, and the other end of the first high-pressure hose 41 is in relative communication with the center tube pressure source interface 332 of the adjustable center tube plug 33, so that the interior of the first high-pressure hose 41 is in relative communication with the interior of the center tube pressure source interface 332.

[0050] One end of the second high-pressure hose 42 is connected to the interior of the power fluid tank 1, and the other end of the second high-pressure hose 42 is threadedly connected to the second connecting part 312 of the oil pipe joint 31, and the interior of the second high-pressure hose 42 is connected to the interior of the second connecting part 312.

[0051] Reference Figure 1 , Figure 6 A pump inlet connector 6 is located at the bottom end of the hydraulic rodless tubular pump unit 2. The pump inlet connector 6 includes a large-diameter end 61 and a small-diameter end 62, which are fixedly connected and internally communicate with each other. The internal diameter of the large-diameter end 61 is larger than the internal diameter of the small-diameter end 62, and the interiors of the large-diameter end 61 and the small-diameter end 62 are internally communicated with each other. A force-reinforcing hexagonal structure 63 is fixedly connected to the outer wall at the connection position between the large-diameter end 61 and the small-diameter end 62. The force-reinforcing hexagonal structure 63 is a hexagonal prism, and its central axis is coaxial with the central axis of the pump inlet connector 6.

[0052] The inner wall of the large diameter end 61 is threaded to the bottom of the hydraulic rodless tubular pump unit 2, and a rubber tube is threaded to the outer wall of the small diameter end 62. One end of the rubber tube is connected to the small diameter end 62, and the other end of the rubber tube extends into the interior of the liquid level metering tank 5.

[0053] The liquid level measuring tank 5 is an open-top container with graduations on its inner wall and a handle fixedly connected to its outer wall. The end of the hose is located inside the liquid level meter and below the liquid level. In some embodiments, the liquid level measuring tank 5 has a pressure resistance greater than 0.5 MPa, a height between 35-50 cm, and a water storage capacity greater than 0.1 m³. 3 .

[0054] The embodiment of the application is that: the shunt 32 of the wellhead connecting device 3 is screwed into the first connecting end 3111 of the tubing joint 31 by threads; the first sealing groove 333 of the adjustable central pipe plug 33 is sleeved with the first sealing ring 3331, the tapered end is inserted from one end of the second connecting end 3112 of the tubing joint 31, and the adjustable central pipe plug 33 is screwed into the shunt 32 by threads; the power liquid tank 1 is connected to the central pipe pressure source interface end 332 of the adjustable central pipe plug 33 through the first high-pressure hose 41, the second high-pressure hose 42 is screwed with the second connecting part 312 of the tubing joint 31; the pump suction inlet connector 6 is screwed at the pump suction inlet at the bottom end of the hydraulic rodless pipe pump set 2, and is connected to the liquid water stored in the liquid level measuring barrel 5 through a rubber tube; the driving high-pressure power liquid equipment is used to make the high-pressure power liquid of the power liquid tank 1 alternately pressurize the hydraulic rodless pipe pump set 2 through the first high-pressure hose 41 and the second high-pressure hose 42 to drive the hydraulic rodless pipe pump set 2 to work and suck the liquid water stored in the liquid level measuring barrel 5, and the working condition of the pump is calculated according to the ratio of the observed liquid level to the theoretical liquid level to achieve the purpose of pump testing.

[0055] The application also provides a test method applied to the hydraulic rodless pipe pump leak testing device, and the test method comprises the following steps:

[0056] S01: the wellhead connecting device 3 is connected to the interface at the top of the hydraulic rodless pipe pump set 2, the pump suction inlet connector 6 is connected to the bottom of the hydraulic rodless pipe pump set 2, the power liquid tank 1 is connected to the wellhead connecting device 3 through the high-pressure connecting assembly 4, and finally the liquid level measuring barrel 5 is filled with water (simulating formation water), and the pump suction inlet connector 6 is connected to the water (simulating formation water) in the liquid level measuring barrel 5 through a rubber tube;

[0057] S02: the hydraulic rodless pipe pump set is tested for leakage by leak testing or verifying pump efficiency.

[0058] The leak testing in step S02 is as follows:

[0059] S021: central pipe leak testing: the connection between the central pipe of the hydraulic rodless pipe pump set and the first high-pressure hose of the power liquid tank is cancelled, the connection of the second high-pressure hose of the hydraulic rodless pipe pump set is opened, the tubing is pressurized to 20 MPa, and the water output is less than 100 ml / min after the pressure is stabilized, which is qualified.

[0060] Fixed valve leak test: close the center tube of the water hydraulic rodless tube pump group and the first high pressure hose of the power liquid tank, open the second high pressure hose of the water hydraulic rodless tube pump group, press the oil pipe to 20 MPa, and close the liquid inlet valve of the oil pipe after the pressure is stable to observe the pressure drop. If the pressure drop is ≤0.1 MPa in 10 min, it is qualified;

[0061] The verification pump efficiency in step S02 is:

[0062] S022: Start the power liquid tank 1 to generate high pressure power liquid, which is delivered to the wellhead connection device 3 through the high pressure connection assembly 4. The wellhead connection device 3 is respectively connected to the center tube and the oil pipe joint 31 of the water hydraulic rodless tube pump group 2. The high pressure power liquid is alternately pressed from the center tube and the oil pipe joint 31 to the downhole pump group, driving the dynamic cylinder piston in the water hydraulic rodless tube pump group 2 to move for pumping, and pumping the water (simulating formation water) in the liquid level measuring barrel 5.

[0063] The ratio of the liquid level drop in the liquid level measuring barrel 5 to the theoretical displacement can calculate the pump efficiency and leakage.

[0064] The water hydraulic rodless tube pump test and leak detection device of the present application is suitable for the water hydraulic rodless tube pump group with the following pump types: 70-38-2.7, 70-44-2.7, 70-50-2.7, 70-38-3.7, 70-44-3.7 and 70-50-3.7.

[0065] When the top of the downhole pump group is connected to the high pressure water line through the wellhead connection device 3, and the bottom of the downhole pump group is connected to the liquid in the liquid level measuring barrel 5 through the pump suction inlet connector 6, the pump efficiency is ≥90%, which is qualified.

[0066] Pump efficiency: the ratio of the daily liquid production of the oil and gas well to the theoretical displacement of the pump:

[0067] Wherein,

[0068] The theoretical displacement of the water hydraulic rodless tube pump group with the pump type of 70-38-2.7 is 4.4 m 3 / d.

[0069] The theoretical displacement of the water hydraulic rodless tube pump group with the pump type of 70-44-2.7 is 5.9 m 3 / d.

[0070] The theoretical displacement of the water hydraulic rodless tube pump group with the pump type of 70-50-2.7 is 7.6 m 3 / d.

[0071] The theoretical displacement of the water hydraulic rodless tube pump group with the pump type of 70-38-3.7 is 6 m 3 / d.

[0072] The pump type of the hydraulic rodless pipe pump set is 70-44-3.7, and the theoretical displacement is 8.09m 3 / d.

[0073] The pump type of the hydraulic rodless pipe pump set is 70-50-3.7, and the theoretical displacement is 10.4m 3 / d.

[0074] In the present application, the term "a plurality of" refers to at least two or at least two more, unless otherwise explicitly limited. The terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, "connecting" can be fixed connection, or detachable connection, or integral connection; "connecting" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0075] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "a specific embodiment" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A pump testing and leak detection device for a hydraulic rodless tubular pump, characterized in that: The utility model provides a kind of wellhead connecting device, including power liquid water tank (1), one side of the power liquid water tank (1) is provided with hydraulic rodless pipe type pump group (2), the top of the hydraulic rodless pipe type pump group (2) is provided with wellhead connecting device (3), and the wellhead connecting device (3) is provided with endless seal assembly between the central tube of the hydraulic rodless pipe type pump group, the wellhead connecting device (3) is connected with the power liquid water tank (1) by high-pressure connecting assembly (4), the bottom of the hydraulic rodless pipe type pump group (2) is provided with liquid level measuring barrel (5), and the bottom of the hydraulic rodless pipe type pump group (2) is communicated with liquid inside the liquid level measuring barrel (5).

2. A hydraulic rodless tube pump leak testing device as claimed in claim 1, wherein: The wellhead connecting device (3) includes a tubing spool (31), the tubing spool (31) includes a first connecting portion (311) and a second connecting portion (312), the interiors of the first connecting portion (311) and the second connecting portion (312) are in communication, a flow divider (32) is coaxially connected to the inside of one end of the first connecting portion (311), one end of the first connecting portion (311) with the flow divider (32) is connected to the top of the hydraulic rodless pipe type pump group (2), the other end of the first connecting portion (311) is connected to the high-pressure connecting assembly (4), and one end of the second connecting portion (312) away from the first connecting portion (311) is connected to the high-pressure connecting assembly (4).

3. A hydraulic rodless tube pump leak testing device as claimed in claim 2, wherein: An adjustable central tube plug (33) is coaxially arranged in the interior of the tubing spool (31), one end of the adjustable central tube plug (33) is threadedly connected to the flow divider (32), one end of the tubing spool (31) provided with the flow divider (32) is threadedly connected to the top of the hydraulic rodless pipe type pump group (2), and one end of the adjustable central tube with the flow divider (32) is connected to the central tube port inside the hydraulic rodless pipe type pump group (2).

4. The hydraulic rodless tube pump leak testing device of claim 2, wherein: A through hole (321) is formed in the end wall of the flow divider (32), the through hole (321) is arranged along the axial direction of the flow divider (32), and the through hole (321) penetrates the two end walls of the flow divider (32).

5. A hydraulic rodless tube pump leak testing device as claimed in claim 3, wherein: The high-pressure connecting assembly (4) includes a first high-pressure hose (41) and a second high-pressure hose (42), one end of the first high-pressure hose (41) is in communication with the interior of the power liquid water tank (1), the other end of the first high-pressure hose (41) is connected to one end of the adjustable central tube plug (33) away from the hydraulic rodless pipe type pump group (2), one end of the second high-pressure hose (42) is in communication with the interior of the power liquid water tank (1), and the other end of the second high-pressure hose (42) is in communication with the second connecting portion (312).

6. A hydraulic rodless tube pump leak testing device as claimed in claim 3, wherein: The adjustable central tube plug (33) includes a vertebral body end (331) connected to the flow divider (32) and a central tube pressure source interface end (332) away from one end of the flow divider (32), the endless seal assembly includes a conical structure arranged on the vertebral body end (331), and a sealing assembly is arranged on the vertebral body end (331) and the central tube pressure source interface end (332), respectively.

7. A hydraulic rodless tube pump leak testing device as defined in claim 1, wherein: The bottom end of the hydraulic rodless pipe pump set (2) is provided with a pump suction inlet connector (6), one end of the pump suction inlet connector (6) is threadedly connected with the hydraulic rodless pipe pump set (2), and the other end of the pump suction inlet connector (6) is fixedly connected with a rubber pipe, and the rubber pipe extends into the inside of the liquid level measuring barrel (5).

8. A hydraulic rodless tube pump leak testing device as claimed in claim 7, wherein: The pump suction inlet connector (6) comprises a large-diameter end (61) and a small-diameter end (62), the inner diameter of the large-diameter end (61) is larger than that of the small-diameter end (62), the inner side wall of the large-diameter end (61) is threadedly connected with the hydraulic rodless pipe pump set (2), and the outer side wall of the small-diameter end (62) is threadedly connected with the rubber pipe.

9. A test method characterized by, The method is applied to the hydraulic rodless pipe pump leak detection device in any one of claims 1-8, and the method comprises: S01: the wellhead connecting device (3) is communicated with the interface at the top of the hydraulic rodless pipe pump set (2), the pump suction inlet connector (6) is communicated with the bottom of the hydraulic rodless pipe pump set (2), the power liquid tank (1) and the wellhead connecting device (3) are communicated through the high-pressure connecting assembly (4), and finally the liquid level measuring barrel (5) is filled with water, the pump suction inlet connector (6) is communicated with the water in the liquid level measuring barrel (5) through the rubber pipe; S02: the hydraulic rodless pipe pump set is detected for leakage by leak detection test or verification of pump efficiency.

10. A method of testing according to claim 9, characterised in that: In S02, the leak detection test comprises: S021: central pipe leak detection: the connection between the central pipe of the hydraulic rodless pipe pump set (2) and the first high-pressure hose (41) of the power liquid tank (1) is cancelled, the connection of the second high-pressure hose (42) of the hydraulic rodless pipe pump set (2) is opened, the tubing is pressurized to 20 MPa, and after the pressure is stabilized, the water output is less than 100 ml / min, which is qualified; Fixed valve leak detection: the connection between the central pipe of the hydraulic rodless pipe pump set (2) and the first high-pressure hose (41) of the power liquid tank (1) is closed, the connection of the second high-pressure hose (42) of the hydraulic rodless pipe pump set (2) is opened, the tubing is pressurized to 20 MPa, and after the pressure is stabilized, the liquid inlet valve of the tubing is closed to observe the pressure drop, and the pressure drop is less than or equal to 0.1 MPa within 10 min, which is qualified; In S02, the verification of pump efficiency comprises: S022: the power liquid tank (1) is started to generate high-pressure power liquid, the high-pressure power liquid is delivered to the wellhead connecting device (3) through the high-pressure connecting assembly (4), the wellhead connecting device (3) is respectively communicated with the central pipe and the tubing joint (31) of the hydraulic rodless pipe pump set (2), the high-pressure power liquid is alternately pressurized from the central pipe and the tubing joint (31) to the downhole pump set, the dynamic cylinder piston in the hydraulic rodless pipe pump set (2) is driven to perform pumping movement, and the water in the liquid level measuring barrel (5) is pumped; The ratio of the liquid level drop in the liquid level measuring barrel (5) to the theoretical displacement can calculate the pump efficiency and the leakage.

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