Underground electromagnetic flowmeter sensor mounting structure

Abstract

The utility model discloses an underground electromagnetic flowmeter sensor installation structure which comprises an upper connector, one end of the upper connector is provided with an insulating pipe, the other end of the insulating pipe is provided with a lower connector, and sealing rings B are arranged between the insulating pipe and the upper connector and between the insulating pipe and the lower connector respectively. Electrode mounting holes are formed in the surfaces of the upper connector, the limiting sleeve and the lower connector; the electrode is positioned in the electrode mounting hole, a sealing ring A is arranged at the electrode mounting hole in the tube wall of the insulating tube, threads are arranged at one end, positioned in the electrode mounting hole, of the electrode, and a hexagonal nut is sleeved on the surface of the electrode and is in threaded connection with the threads at the lower end of the electrode; the coil support is located in the limiting sleeve and wound with a coil, and one end of the coil is provided with a twisted-pair shielding wire E. Compared with the prior art, the utility model has the advantages that the bearing pressure is high, and the service life is long; the whole structure is stable and reliable, simple to install and convenient to disassemble and assemble; parts are simple and easy to process, and instrument manufacturing cost is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of downhole instrument structures used in petroleum development, in particular to a downhole electromagnetic flowmeter sensor installation structure. Background Art

[0002] Well conditions in oil production are very complex. Among the many downhole flowmeters, electromagnetic flowmeters can solve problems that are difficult to solve with other flowmeters due to their measurement principles, such as the measurement of dirty flow and corrosive flow. The measured volume flow is actually not significantly affected by changes in fluid density, viscosity, temperature, pressure, and conductivity. However, downhole instruments need to consider the effects of high pressure, high temperature, acidity and alkalinity, and the structure is much more complicated than the design of ground instruments. The difficulty of electromagnetic flowmeters is that the sensor part needs to be in direct contact with the fluid, and then the signal is introduced into the circuit. This makes it difficult to have both the convenience of sensor installation and disassembly and the need for customized seals and high costs while ensuring the sealing and safety of the instrument. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the above technical defects and provide a downhole electromagnetic flowmeter sensor installation structure to overcome the above problems.

[0004] In order to solve the above problems, the technical solution of the utility model is: a downhole electromagnetic flowmeter sensor installation structure, including an upper joint, an insulating tube is provided at one end of the upper joint, a lower joint is provided at the other end of the insulating tube, and a sealing ring B is provided between the insulating tube and the upper joint and the lower joint respectively;

[0005] A limiting sleeve, the limiting sleeve is located inside the upper joint, and the surfaces of the upper joint, the limiting sleeve and the lower joint are all provided with electrode mounting holes;

[0006] An electrode, the electrode is located inside the electrode mounting hole, a sealing ring A is provided between the electrode and the electrode mounting hole on the wall of the insulating tube, a thread is provided at one end of the electrode located inside the electrode mounting hole, a hexagonal nut is sleeved on the surface of the electrode, and the hexagonal nut is threadedly connected to the thread at the lower end of the electrode;

[0007] The coil bracket is located inside the limiting sleeve, the coil bracket is wound with a coil, and one end of the coil is provided with a twisted shielded wire E.

[0008] Furthermore, the surface of the electrode is sequentially sleeved with a gasket, a circular terminal, and a spring, and an electrode insulating ring is provided between the gasket and the sealing ring A.

[0009] Furthermore, a twisted shielded pair wire C and a twisted shielded pair wire D are provided at one end of the circular terminal.

[0010] Furthermore, the limiting sleeve is provided with two pairs of slots with different widths, the slots and the electrode mounting holes are distributed in pairs, a magnetic pole is provided inside the wider slot, and a tightening screw sleeve is provided at the bottom of the slot.

[0011] Furthermore, the electrode insulating ring, the limiting sleeve and the insulating tube are made of insulating materials.

[0012] Furthermore, it also includes a nut sleeve, which is sleeved on the hexagonal nut and is an assembly tool.

[0013] The advantages of the utility model compared with the existing technology are:

[0014] (1) The utility model adopts O-rings that are not prone to failure for radial sealing at the sealing parts, and the compression state of the O-rings will not change when the electrode is subjected to external pressure, so it can withstand high pressure and has a long service life;

[0015] (2) When installing the electrode, the utility model only needs to ensure that the sealing ring completely enters the sealing surface and pre-tighten the hexagonal nut to ensure the seal. There is no need to consider the problem that the end face seal needs to press the sealing surface. The electrode is installed first and then welded. There is no influence of the shielding wire, which makes assembly easier. The wiring terminal is also easy to weld. The position between the coil bracket, the magnetic pole and the electrode is positioned by the wide and narrow grooves and the mounting holes on the limit sleeve. There is no interference between them to cause a short circuit. No adjustment is required after installation. The whole structure is stable and reliable, simple to install, and easy to disassemble.

[0016] (3) The utility model uses a standard O-ring and does not require customized seals. Standard parts such as round terminal blocks, spring washers, hexagonal nuts, etc. are easy to purchase, and the parts are simple and easy to process, which effectively reduces the manufacturing cost of the instrument. It is suitable for oil field downhole electromagnetic flow meters. Both storage type and direct reading type electromagnetic flow meters can adopt this structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the installation structure of a downhole electromagnetic flowmeter sensor of the utility model. Figure 1 .

[0018] Figure 2 This is a schematic diagram of the installation structure of a downhole electromagnetic flowmeter sensor of the utility model. Figure 2 .

[0019] Figure 3 The utility model is a schematic diagram of the installation structure of a downhole electromagnetic flowmeter sensor installation structure.

[0020] Figure 4 The utility model is a schematic diagram of a nut-sleeve structure of a downhole electromagnetic flowmeter sensor installation structure.

[0021] As shown in the figure: 1. Upper connector; 2. Electrode; 3. Sealing ring A; 4. Electrode insulating ring; 5. Round terminal; 6. Gasket; 7. Spring clip; 8. Hexagonal nut; 9. Limit sleeve; 10. Lower connector; 11. Sealing ring B; 12. Insulating tube; 13. Compression screw sleeve; 14. Coil bracket; 15. Coil; 16. Magnetic pole; 17. Twisted-pair shielded wire C; 18. Twisted-pair shielded wire D; 19. Twisted-pair shielded wire E; 20. Nut sleeve; 21. Electrode mounting hole; 22. Slot. DETAILED DESCRIPTION

[0022] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings, wherein the same parts are represented by the same reference numerals.

[0023] It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to directions in the drawings, and the words "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0024] In order to make the contents of the present invention more clearly understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

[0025] Embodiment 1

[0026] like Figures 1 to 4 As shown, a downhole electromagnetic flowmeter sensor installation structure includes an upper joint 1, an insulating tube 12 is installed at one end of the upper joint 1, and a lower joint 10 is installed at the other end of the insulating tube 12. A sealing ring B11 is installed between the insulating tube 12 and the upper joint 1 and the lower joint 10 to form a radial seal.

[0027] The limiting sleeve 9 is located inside the upper joint 1. The surfaces of the upper joint 1, the limiting sleeve 9 and the lower joint 10 are all provided with electrode mounting holes 21. During installation, the electrode mounting holes 21 of the upper joint 1, the limiting sleeve 9 and the lower joint 10 are aligned.

[0028] The electrode 2 is located inside the electrode mounting hole 21, and a sealing ring A3 is installed at the electrode mounting hole 21 on the wall of the electrode 2 and the insulating tube 12 to form a radial seal, ensuring that the electrode 2 is sealed and isolated from the internal space when it contacts the external fluid of the instrument. The electrode 2 is located inside the electrode mounting hole 21 and has a thread at one end. A hexagonal nut 8 is installed on the surface of the electrode 2, and the hexagonal nut 8 is threadedly connected to the thread at the lower end of the electrode 2; a gasket 6, a round terminal 5, and a spring 7 are installed on the surface of the electrode 2 in sequence, and an electrode insulating ring 4 is installed between the gasket 6 and the sealing ring A3. In addition to straightening the electrode 2, the electrode insulating ring 4 also plays an insulating role between the electrode 2 and the upper joint 1. A limiting sleeve 9 is added to isolate and insulate the gasket 6 and the upper joint 1, and the electrode 2 does not contact the metal shell to prevent short circuit.

[0029] The coil bracket 14 is located inside the limiting sleeve 9, and the coil bracket 14 is wound with a coil 15. One end of the coil 15 is installed with a twisted shielded wire E19, and one end of the circular terminal 5 is installed with a twisted shielded wire C17 and a twisted shielded wire D18. The limiting sleeve 9 has two pairs of slots 22 with different widths, and the slots 22 and the electrode mounting holes 21 are distributed at 45 degrees. The wider slot 22 is installed inside the magnetic pole 16, and the bottom of the slot 22 is installed with a tightening screw sleeve 13.

[0030] The electrode insulating ring 4, the limiting sleeve 9 and the insulating tube 12 are made of insulating materials. The nut rotating sleeve 20 is sleeved on the hexagonal nut 8, and the nut rotating sleeve 20 is an assembly tool.

[0031] Embodiment 2

[0032] Based on the first embodiment, the insulating tube 12 is respectively sealed with the upper joint 1 and the lower joint 10 by a sealing ring B11, and the electrode 2 is sealed with the electrode mounting hole on the wall of the insulating tube 12 by a sealing ring A3. These three seals ensure that the electrode 2 is sealed and isolated from the internal space when it contacts the external fluid of the instrument. The upper joint 1, the limiting sleeve 9, and the insulating tube 12 are respectively sealed with a sealing ring B11. Figure 1 When assembling in the direction shown, ensure that the four sets of electrode mounting holes 21 can correspond to each other, then insert the electrode 2 with the sealing ring A3 into the hole. The electrode 2 has a thread on the inner side of the instrument. Put the gasket 6, round terminal 5, spring washer 7, and hexagonal nut 8 on the electrode in sequence, and screw the nut 20 onto the hexagonal nut 8. Use a flat-blade screwdriver to push its slot and rotate it. Fully pre-tighten the electrode 2 and the hexagonal nut 8, and then connect the twisted shielded pair wire C17 and the twisted shielded pair wire D18 respectively according to the Figure 2 As shown, it is welded on the corresponding circular terminal 5; first, insert the narrow foot of the coil bracket 14 wound with the coil 15 and welded with the twisted pair shielded wire E19 into the narrow slot 22, then insert the wide foot of the pole 16 into the wide slot 22, and push it to the bottom of the slot, screw in the clamping screw sleeve 13 to tighten it, tighten the lower joint 10, and the entire electromagnetic flowmeter sensor structure is assembled. The three twisted pair shielded wires can be connected to the circuit for use.

[0033] The above description of the utility model and its implementation methods is not restrictive. The drawings show only one implementation method of the utility model, and the actual structure is not limited thereto. In short, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention of the utility model, they should all fall within the protection scope of the utility model.

Claims

1. A downhole electromagnetic flowmeter sensor installation structure, characterized in that: include: An upper joint (1), wherein an insulating tube (12) is provided at one end of the upper joint (1), and a lower joint (10) is provided at the other end of the insulating tube (12), and sealing rings B (11) are provided between the insulating tube (12) and the upper joint (1) and the lower joint (10); A limiting sleeve (9), wherein the limiting sleeve (9) is located inside the upper joint (1), and surfaces of the upper joint (1), the limiting sleeve (9) and the lower joint (10) are all provided with electrode mounting holes (21); An electrode (2), the electrode (2) being located inside an electrode mounting hole (21), a sealing ring A (3) being provided between the electrode (2) and the electrode mounting hole (21) on the wall of the insulating tube (12), a thread being provided at one end of the electrode (2) located inside the electrode mounting hole (21), a hexagonal nut (8) being sleeved on the surface of the electrode (2), the hexagonal nut (8) being threadedly connected to the thread at the lower end of the electrode (2); A coil support (14), the coil support (14) is located inside the limiting sleeve (9), a coil (15) is wound around the coil support (14), and a twisted shielded wire E (19) is provided at one end of the coil (15).

2. The downhole electromagnetic flowmeter sensor installation structure according to claim 1, characterized in that: The surface of the electrode (2) is sequentially sleeved with a gasket (6), a circular terminal (5), and a spring (7); an electrode insulating ring (4) is provided between the gasket (6) and the sealing ring A (3).

3. The downhole electromagnetic flowmeter sensor installation structure according to claim 2, characterized in that: One end of the circular terminal (5) is provided with a twisted shielded pair wire C (17) and a twisted shielded pair wire D (18).

4. The downhole electromagnetic flowmeter sensor installation structure according to claim 1, characterized in that: The limiting sleeve (9) is provided with two pairs of slots (22) of different widths, the slots (22) and the electrode mounting holes (21) are arranged at 45 degrees in pairs, a magnetic pole (16) is arranged inside the wider slot (22), and a pressing screw sleeve (13) is arranged at the bottom of the slot (22).

5. The downhole electromagnetic flowmeter sensor installation structure according to claim 2, characterized in that: The electrode insulating ring (4), the limiting sleeve (9) and the insulating tube (12) are made of insulating materials.

6. The downhole electromagnetic flowmeter sensor installation structure according to claim 1, characterized in that: It also comprises a nut rotating sleeve (20), wherein the nut rotating sleeve (20) is sleeved on the hexagonal nut (8), and the nut rotating sleeve (20) is an assembly tool.

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