A downhole pump test system with low risk of tubing and cable winding

Abstract

This invention discloses a downhole pumping test operation system with low risk of cable entanglement. The system aims to emit multiple laser beams into a floating area using a laser ranging module, ensuring that the emitted laser beams are reflected by a reflector, thus guaranteeing the continuity and accuracy of water level monitoring and reducing the probability of entanglement. The technical solution includes a pumping drill rod, a float, and a pumping pump located at the end of the drill rod. The area above the water surface in the well is the floating area, on which the float floats. The float is equipped with a reflector. A laser ranging module is also included above the wellhead. The laser ranging module can emit multiple laser beams into the floating area, and the reflector is used to reflect the laser beams. The pumping pump is equipped with a recovery bucket. When the pumping pump is lifted by an external lifting mechanism, the recovery bucket can retrieve the float. This system belongs to the field of hydrogeological exploration technology.

Description

Technical Field

[0001] This invention belongs to the field of geological exploration equipment, and more specifically, relates to a downhole pumping test operation system with low risk of cable entanglement. Background Technology

[0002] Pumping tests are an important type of hydrogeological test in the field of hydrogeology. They are related to the accuracy and precision of hydrogeological work such as groundwater resource assessment, mine water inflow calculation, and aquifer water-bearing assessment. The pumping test process requires continuous and dynamic monitoring of the water level.

[0003] In existing pumping tests, more than five cables need to be lowered into the well, including the pump cable, water level gauge cable / rope, PVC water level measuring pipe, pumping pipe, and steel wire rope that bears the weight and torque of the submersible pump. The water level gauge rope needs to be continuously and dynamically raised or lowered. This measurement method is prone to cable entanglement. When entanglement occurs, the pump continues to run and the water level continues to drop, but the water level gauge rope cannot keep up with the lowering. Therefore, the test fails due to interruption of data recording. In the worst case, after entanglement occurs, the pump will not be able to be raised back to the surface for recovery, resulting in equipment loss or even the abandonment of the test well. Moreover, the measurement is delayed in both the lowering and data reading stages. Summary of the Invention

[0004] The main objective of this invention is to provide a downhole pumping test operation system with low risk of cable entanglement. The system aims to emit multiple laser beams into the floating area through a laser ranging module, ensuring that the emitted laser beams hit the reflector, thereby guaranteeing the continuity and accuracy of water level monitoring. Furthermore, the pipelines inside the well consist only of the drill pipe and the external water pump cable, greatly reducing the probability of entanglement.

[0005] According to a first aspect of the present invention, a downhole pumping test operation system with low risk of cable entanglement is provided, comprising a pumping drill pipe, a float, and a pumping pump disposed at the end of the pumping drill pipe, wherein the area of ​​the downhole water surface is a floating area, the float floats on the floating area, the float is provided with a reflector, and the system further comprises a laser ranging module disposed above the wellhead, the laser ranging module being capable of emitting multiple laser beams toward the floating area, and the reflector being used to reflect the laser beams;

[0006] The water pump is equipped with a recovery hopper. When the water pump is lifted by an external lifting mechanism, the recovery hopper can retrieve the float.

[0007] In the aforementioned downhole pumping test system with low risk of cable entanglement, the laser ranging module includes a mounting base and a laser ranging component disposed within the mounting base, the mounting base being fixed to the wellhead by bolts.

[0008] In the aforementioned downhole pumping test system with low cable entanglement risk, the float includes a column and a hemisphere docked at the bottom of the column. The column has a vacuum cavity inside, and the float can float on the floating area.

[0009] The reflector is fixed to the top of the column, and the hemisphere has a receiving cavity with a counterweight inside. The counterweight is used to make the reflector face the wellhead.

[0010] In the aforementioned low-risk downhole pumping test system, the recovery bucket comprises a first part and a second part, wherein the first part is trumpet-shaped and the second part is cylindrical.

[0011] The large opening of the first part faces upward, the second part is arranged vertically, and one end of the second part is connected to the bottom of the first part;

[0012] The other end of the second part is detachably connected to the water pump via a mounting component.

[0013] In the aforementioned low-risk downhole pumping test system, the counterweight is made of a magnetic material and includes a ring-shaped magnet. The magnet has a first through hole for the pumping drill pipe to pass through. The bottom of the first part is a connecting plate for placing the magnet. One end of the second part is connected to the connecting plate. The connecting plate has a second through hole that communicates with the second part. The outer diameter of the magnet is adapted to the inner diameter of the first part.

[0014] In the aforementioned low-risk downhole pumping test system, the pumping drill pipe includes drill pipe units, a first joint, and a second joint. There are multiple drill pipe units and multiple first joints. The drill pipe units are connected to each other through the first joints.

[0015] The drill rod unit at the end is connected to the water pump via the second connector; the second connector includes a tubular body, the inner wall of one end of the body is provided with an internal thread for screwing into the water pump, and the outer wall of the other end of the first column is provided with an external thread for screwing into the drill rod unit.

[0016] In the aforementioned downhole pumping test system with low cable entanglement risk, the mounting base comprises two symmetrically arranged base bodies spliced ​​together, and the inner side of the base body is provided with a slot.

[0017] The laser ranging assembly includes a housing and a laser ranging element disposed within the housing. The housing corresponds one-to-one with the slot, and the housing is fixed in the slot. A first recess is provided on one side of the housing.

[0018] The aforementioned downhole pumping test system with low cable entanglement risk also includes two symmetrically arranged lenses. The inner side of the base is also provided with a support block, which is located below the slot. The lens corresponds to the support block one by one. The lens is placed on the support block and is located inside the wellhead. The laser emitted by the laser ranging element passes through the lens and is directed toward the floating area.

[0019] The lens has a second recess. When the two bases are spliced ​​together, the two first recesses form a first channel and the two second recesses form a second channel. The first channel and the second channel are respectively vertically corresponding. The water-pumping drill rod can pass through the first channel and the second channel.

[0020] In the aforementioned downhole pumping test system with low risk of cable entanglement, the mounting base is equipped with a circular leveling bubble, and the outer diameter of the large opening in the first part is adapted to the inner diameter of the well wall.

[0021] The aforementioned downhole pumping test system with low cable entanglement risk also includes a first sealing ring and a second sealing ring. There are multiple first sealing rings, and each first sealing ring corresponds to a first joint. The first sealing ring is fitted onto the external thread of the first joint. The second sealing ring is fitted onto the threaded interface of the pump.

[0022] One of the above-described technical solutions of the present invention has at least one of the following advantages or beneficial effects:

[0023] In this invention, multiple laser beams are emitted into the floating area through a laser ranging module, ensuring that the emitted lasers hit the reflector and can measure the water level in real time, thus guaranteeing the continuity and accuracy of water level monitoring. Moreover, the float can be retrieved simultaneously with the pumping pump after the pumping test, solving the problem of the narrow wellhead making it inconvenient for workers to retrieve the float. Furthermore, only the drill rod and the external water pump cable remain in the well, greatly reducing the probability of entanglement. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0025] Figure 1 This is a schematic diagram of the structure of the downhole pumping test operation system with low risk of cable entanglement as described in this application;

[0026] Figure 2 This is a perspective view of the mounting base of the downhole pumping test operation system with low cable entanglement risk of this application;

[0027] Figure 3This is a schematic diagram of the mounting base of the downhole pumping test operation system with low risk of cable entanglement as described in this application;

[0028] Figure 4 This is one of the perspective views of the base of the downhole pumping test operation system with low cable entanglement risk of this application;

[0029] Figure 5 This is the second perspective view of the base of the downhole pumping test operation system with low cable entanglement risk of this application;

[0030] Figure 6 This is a schematic diagram of the structure of the float in the downhole pumping test operation system with low risk of cable entanglement as described in this application;

[0031] Figure 7 This is a schematic diagram of the recovery bucket of the downhole pumping test operation system with low cable entanglement risk of this application;

[0032] Figure 8 This is a perspective view of the first part of the downhole pumping test operation system with low cable entanglement risk of this application;

[0033] Figure 9 This is a top view of the magnet of the downhole pumping test operation system with low cable entanglement risk of this application;

[0034] Figure 10 This is a schematic diagram of the assembly of the first sealing ring of the downhole pumping test operation system with low cable entanglement risk of this application;

[0035] Figure 11 This is a schematic diagram of the assembly of the second sealing ring of the downhole pumping test operation system with low cable entanglement risk of this application;

[0036] Figure 12 This is a schematic diagram of the structure of the second joint of the downhole pumping test operation system with low cable entanglement risk of this application;

[0037] The figure labels for each figure are as follows:

[0038] 1. Pumping drill rod; 11. Drill rod unit; 12. First connector; 13. Second connector; 131. External thread; 132. Internal thread; 14. First sealing ring; 15. Second sealing ring; 2. Float; 21. Reflector; 22. Column; 221. Vacuum chamber; 23. Hemisphere; 231. Receiving cavity; 24. Counterweight; 3. Pumping pump; 4. Floating area; 5. Laser ranging module; 51. Mounting base; 511. Base body; 5 111, Slot; 5112, Support block; 52, Laser ranging component; 521, Housing; 5211, First recess; 5212, First channel; 53, Lens; 531, Second recess; 532, Second channel; 54, Circular level bubble; 6, Recovery hopper; 61, First part; 611, Connecting plate; 6111, First through hole; 62, Second part; 63, Magnet; 631, Second through hole; 7, Bolt; 8, Mounting component. Detailed Implementation

[0039] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0040] The following disclosure provides many different implementations or examples for different ways of implementing the present invention.

[0041] Reference Figures 1 to 12 As shown, a downhole pumping test operation system with low risk of cable entanglement includes a pumping drill pipe 1, a float 2, and a pumping pump 3 located at the end of the pumping drill pipe 1. The area on the water surface in the well is a floating area 4, and the float 2 floats on the floating area 4. The float 2 is equipped with a reflector 21. The system also includes a laser ranging module 5 located above the wellhead. The laser ranging module 5 can emit multiple laser beams into the floating area 4, and the reflector 21 is used to reflect the laser beams.

[0042] The water pump 3 is equipped with a recovery hopper 6. When the water pump 3 is lifted by an external lifting mechanism for recovery, the recovery hopper 6 will scoop up and recover the float 2.

[0043] It should be noted here that the lifting mechanism of the external device can be a drilling rig or a winch. The other end of the water pumping drill rod 1 away from the water pump 3 is connected to the lifting mechanism of the external device, so that the water pump 3 can be lowered into the well or lifted out of the well. The water pump 3 can be a submersible pump.

[0044] In this design, workers first use the external lifting mechanism to submerge the water pump 3 in the well water, and then place the float 2 into the well. The float 2 then floats on the floating area 4. Since the laser ranging module 5 emits multiple laser beams into the floating area 4, the laser will always shine on the reflector 21 on the float 2 as it moves. Moreover, after the pumping test is completed, when it is necessary to retrieve the water pump 3, the external lifting mechanism lifts the water pump 3 while the float 2 is retrieved from the floating area 4 through the retrieval bucket 6. In this way, it can be ensured that the laser of the laser ranging module 5 can hit the reflector 21, ensuring the continuity and accuracy of water level monitoring. In addition, the retrieval process of the float 2 is simple and quick, and only the drill rod and the external water pump cable remain in the well, greatly reducing the probability of entanglement.

[0045] In this embodiment, the laser ranging module 5 includes a mounting base 51 and a laser ranging component 52 disposed within the mounting base 51. The mounting base 51 is fixed to the wellhead by bolts 7.

[0046] The float 2 includes a column 22 and a hemisphere 23 connected to the bottom of the column 22. The column 22 has a vacuum cavity 221 inside. The float 2 can float on the floating area 4.

[0047] The reflector 21 is fixed to the top of the column 22. The hemisphere 23 has a receiving cavity 231 and a counterweight 24 is provided in the receiving cavity 231. The counterweight 24 is used to enable the reflector 21 to face the wellhead.

[0048] Specifically, the column 22 is set up with a vacuum cavity 221. The overall density of the float 2 is less than that of water, so that the float 2 can float on the water surface. The counterweight 24 is used to make the reflector 21 on the float 2 face the wellhead so that the laser of the laser ranging module 5 can be projected onto the reflector 21.

[0049] Preferably, the recycling hopper 6 includes a first part 61 and a second part 62, wherein the first part 61 is funnel-shaped and the second part 62 is cylindrical;

[0050] The large opening of the first part 61 faces upward, and the second part 62 is arranged vertically, with one end of the second part 62 connected to the bottom of the first part 61;

[0051] The other end of the second part 62 is detachably connected to the water pump 3 via a mounting piece 8.

[0052] The counterweight 24 is made of a magnetic material and also includes a ring-shaped magnet 63. The magnet 63 has a first through hole 6111 for the water-pumping drill rod 1 to pass through. The bottom of the first part 61 is a connecting plate 611 for placing the magnet 63. One end of the second part 62 is connected to the connecting plate 611. The connecting plate 611 has a second through hole 631, which communicates with the second part 62. The outer diameter of the magnet 63 is adapted to the inner diameter of the first part 61.

[0053] Specifically, the pumping drill rod 1 can pass through the first through hole 6111 and the second through hole 631. The external water pump cable will also pass through the first through hole 6111 and the second through hole 631 and be connected to the pumping pump 3 for operation. The pumping drill rod 1 passes through the recovery hopper 6 and is connected to the pumping pump 3. The magnet 63 will be placed on the connecting plate 611 inside the second part 62. After the float 2 is lifted from the floating area 4, the float 2 will be fixed by the cooperation of the magnet 63 and the counterweight 24. In this way, after the pumping test is completed, the float 2 will be recovered at the same time as the pumping pump 3 is recovered.

[0054] Generally, the mounting part 8 can be a hose clamp. When installing the recovery bucket 6, first put the second part 62 on the top of the water pump 3, and then use the mounting part 8 to lock the second part 62 and the water pump 3 together.

[0055] More preferably, the pumping drill rod 1 includes a drill rod unit 11, a first connector 12 and a second connector 13, wherein there are multiple drill rod units 11 and multiple first connectors 12, and the drill rod units 11 are connected to each other through the first connectors 12.

[0056] The drill rod unit 11 at the end is connected to the water pump 3 via the second connector 13. The second connector 13 includes a tubular body. The inner wall of one end of the body is provided with an internal thread 132 for screwing into the water pump 3, and the outer wall of the other end of the first column 22 is provided with an external thread 131 for screwing into the drill rod unit 11.

[0057] The first connector 12 is existing technology and has been disclosed in Chinese patent CN211777250U, so the structure of the first connector 12 will not be described in detail in this embodiment.

[0058] Furthermore, the water pumping drill rod 1 is assembled from individual drill rod units 11. Each drill rod unit 11 is connected to the other through a first connector 12. The drill rod unit 11 and the water pump 3 are screwed together through the internal thread 132 of the second connector 13. The external thread 131 of the second connector 13 is used to screw together with the drill rod unit 11.

[0059] Preferably, the mounting base 51 comprises two symmetrically arranged base bodies 511 spliced ​​together, and the inner side of the base body 511 is provided with a slot 5111;

[0060] The laser ranging component 52 includes a housing 521 and a laser ranging element disposed in the housing 521. The housing 521 corresponds one-to-one with the slot 5111. The housing 521 is fixed in the slot 5111. A first recess 5211 is provided on one side of the housing 521.

[0061] It also includes two symmetrically arranged lenses 53. The inner side of the base 511 is also provided with a support block 5112. The support block 5112 is located below the slot 5111. The lenses 53 correspond one-to-one with the support blocks 5112. The lenses 53 are placed on the support blocks 5112 and are located inside the wellhead. The laser emitted by the laser ranging element passes through the lens 53 and is directed toward the floating area 4.

[0062] The lens 53 is provided with a second recess 531. When the two seats 511 are spliced ​​together, the two first recesses 5211 form a first channel 5212, and the two second recesses 531 form a second channel 532. The first channel 5212 and the second channel 532 are respectively vertically corresponding. The water pumping drill rod 1 can pass through the first channel 5212 and the second channel 532.

[0063] For laser ranging elements, the following can be used: Shanghai Shenji P8864-SMD series 3DTOF laser array radar, Shenzhen Jizhiren Technology Co., Ltd. WS-30PCD-ET3 laser radar, Senkulesa 3DTOF array radar, and Keyence IX-055 / 150 / H2000 / H1.

[0064] Specifically, the mounting base 51 is composed of two base bodies 511 spliced ​​together for easy storage. The laser ranging component 52 is fixed by being snapped into the slot 5111. Since the laser emitted by the laser ranging component 52 passes through the lens 53, when the reflector 21 reflects the laser, it will be focused by the lens 53 and then reflected back to the sensor of the laser ranging component 52, thereby improving the accuracy of the measurement. The first recess 5211 and the second recess 531 are provided to avoid interference between the housing 521 and the lens 53 and the water pumping drill rod 1.

[0065] In this embodiment, the mounting base 51 is provided with a circular level bubble 54, and the outer diameter of the large opening of the first part 61 is adapted to the inner diameter of the well wall.

[0066] Generally, bolt 7 can be an anchor bolt 7, which passes through the mounting base 51 and connects to the ground to fix the mounting base 51. However, the actual installation ground may not be perfectly level. In order to avoid affecting the measurement accuracy of the laser ranging component 52, a circular level bubble 54 is set so that the installer can visually observe the levelness of the mounting base 51. When adjustment is needed, the levelness of the mounting base 51 can be adjusted by adjusting bolt 7. During the process of lifting the water pump 3, the large opening of the first part 61 is adapted to the inner diameter of the well wall, which makes it easy to lift the float 2.

[0067] Preferably, it also includes a first sealing ring 14 and a second sealing ring 15. There are multiple first sealing rings 14, and each first sealing ring 14 corresponds to one of the first joints 12. The first sealing ring 14 is sleeved on the external thread 131 of the first joint 12. The second sealing ring 15 is used to be sleeved on the threaded interface of the water pump 3.

[0068] The first sealing ring 14 is used to improve the sealing effect after the two drill pipe units 11 are spliced ​​together, and the second sealing ring 15 is used to improve the sealing effect when the water pump 3 and the second connector 13 are connected.

Claims

1. A downhole pumping test system with low risk of cable entanglement, comprising a pumping drill pipe, a float, and a pumping pump located at the end of the pumping drill pipe, wherein the area above the water surface in the well is a floating area, the float floats on the floating area, and the float is equipped with a reflector, characterized in that, It also includes a laser ranging module located above the wellhead, which can emit multiple laser beams toward the floating area, and the reflector is used to reflect the laser beams; The water pump is equipped with a recovery hopper. When the water pump is lifted by an external lifting mechanism, the recovery hopper can retrieve the float.

2. The downhole pumping test system with low risk of cable entanglement according to claim 1, characterized in that, The laser ranging module includes a mounting base and a laser ranging component disposed within the mounting base. The mounting base is fixed to the wellhead by bolts.

3. The downhole pumping test system with low risk of cable entanglement according to claim 1, characterized in that, The float includes a column and a hemisphere docked at the bottom of the column. The column has a vacuum cavity inside, and the float can float on the floating area. The reflector is fixed to the top of the column, and the hemisphere has a receiving cavity with a counterweight inside. The counterweight is used to make the reflector face the wellhead.

4. The downhole pumping test system with low risk of cable entanglement according to claim 2, characterized in that, The recycling hopper includes a first part and a second part, wherein the first part is funnel-shaped and the second part is cylindrical; The large opening of the first part faces upward, the second part is arranged vertically, and one end of the second part is connected to the bottom of the first part; The other end of the second part is detachably connected to the water pump via a mounting component.

5. The downhole pumping test system with low risk of cable entanglement according to claim 4, characterized in that, The counterweight is made of a magnetic material and includes a ring-shaped magnet. The magnet has a first through hole for the water-pumping drill rod to pass through. The bottom of the first part is a connecting plate for placing the magnet. One end of the second part is connected to the connecting plate. The connecting plate has a second through hole that communicates with the second part. The outer diameter of the magnet is adapted to the inner diameter of the first part.

6. The downhole pumping test system with low risk of cable entanglement according to claim 1, characterized in that, The pumping drill rod includes a drill rod unit, a first connector, and a second connector. There are multiple drill rod units and multiple first connectors. The drill rod units are connected to each other through the first connectors. The drill rod unit at the end is connected to the water pump via the second connector; the second connector includes a tubular body, the inner wall of one end of the body is provided with an internal thread for screwing into the water pump, and the outer wall of the other end of the first column is provided with an external thread for screwing into the drill rod unit.

7. The downhole pumping test system with low risk of cable entanglement according to claim 2, characterized in that, The mounting base is composed of two symmetrically arranged base bodies spliced ​​together, and the inner side of each base body is provided with a slot. The laser ranging assembly includes a housing and a laser ranging element disposed within the housing. The housing corresponds one-to-one with the slot, and the housing is fixed in the slot. A first recess is provided on one side of the housing.

8. The downhole pumping test system with low risk of cable entanglement according to claim 7, characterized in that, It also includes two symmetrically arranged lenses, and a support block is provided on the inner side of the base. The support block is located below the slot. The lens corresponds to the support block one by one. The lens is placed on the support block and is located inside the wellhead. The laser emitted by the laser ranging element passes through the lens and is directed toward the floating area. The lens has a second recess. When the two bases are spliced ​​together, the two first recesses form a first channel and the two second recesses form a second channel. The first channel and the second channel are respectively vertically corresponding. The water-pumping drill rod can pass through the first channel and the second channel.

9. The downhole pumping test system with low risk of cable entanglement according to claim 2, characterized in that, The mounting base is equipped with a circular leveling bubble, and the outer diameter of the large opening in the first part is adapted to the inner diameter of the well wall.

10. The downhole pumping test system with low cable entanglement risk according to claim 4, characterized in that, The water pumping drill rod also includes a first sealing ring and a second sealing ring. There are multiple first sealing rings, and each first sealing ring corresponds to a first connector. The first sealing ring is fitted onto the external thread of the first connector. The second sealing ring is used to fit onto the threaded interface of the water pump.

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