Underground flow testing device

Abstract

The invention discloses a downhole flow testing device, and belongs to the technical field of downhole flow testing, the downhole flow testing device mainly comprises a hollow shell, a supporting pipe arranged in the shell and a lining arranged on the inner wall of the supporting pipe, the shell comprises an upper connector and a lower connector, a battery cavity is defined between the upper connector and the supporting pipe, and the lower connector is arranged in the battery cavity. A battery cavity is formed in the upper connector, a battery rack is installed in the battery cavity, a battery pack is arranged on the battery rack, a clamping groove is formed in the lower portion of the battery cavity, a circuit board is installed in the clamping groove and electrically connected with the battery pack, an eccentric hole is formed in the upper connector, a cable head is installed in the eccentric hole, and the upper end of the cable head is connected with a steel pipe cable. The lower end is electrically connected with the circuit board. Two power supply modes are provided, and the working stability of the electrode is guaranteed.

Description

Technical Field

[0001] The invention relates to a downhole flow rate testing device, belonging to the technical field of downhole flow rate testing. Background Art

[0002] In oil production, downhole fluid is generally a three-phase flow of oil, gas and water or a two-phase flow of oil and water. Flow rate is one of the important detection parameters of downhole fluid. In the process of oil production, the flow rate of the three-phase flow of oil, gas and water must be accurately measured in order to timely grasp the total output of the fluid in different underground perforation layers, and then obtain various information reflecting oil production such as the dynamic characteristics of the reservoir of the production well, which is of great significance for scientifically formulating oil production plans and ensuring optimized and stable production. Therefore, a downhole flow test device was produced to timely grasp the underground liquid flow rate, but the flow test device in the prior art adopts a single power supply method. If the cable is damaged, the downhole flow device will fail and the underground liquid flow rate cannot be grasped in time. Summary of the invention

[0003] In order to overcome the above technical problems, the present invention provides a downhole flow testing device.

[0004] The present invention provides a downhole flow testing device, comprising a hollow shell, a support tube arranged inside the shell and a lining arranged on the inner wall of the support tube, the shell comprising an upper joint and a lower joint, a battery cavity is defined between the upper joint and the support tube, a battery rack is installed in the battery cavity, a battery pack is arranged on the battery rack, a card slot is provided below the battery cavity, a circuit board is installed in the card slot, the circuit board is electrically connected to the battery pack, an eccentric hole is opened on the upper joint, a cable head is installed in the eccentric hole, the upper end of the cable head is connected to a steel pipe cable, and the lower end is electrically connected to the circuit board.

[0005] Furthermore, the cable head includes a clamping nut and a sealing ball installed on the upper end of the cable head, the clamping nut is installed above the sealing ball, and the steel tube cable passes through the clamping nut and the sealing ball in sequence and is arranged in the cable head.

[0006] Furthermore, a sealing plug is installed at the lower end of the cable head, a rubber tail is installed on the sealing plug, and the steel tube cable passes through the clamping nut and the sealing ball in sequence and is connected to the rubber tail.

[0007] Furthermore, the sealing plug is fixed in the eccentric hole by a compression screw plug.

[0008] Furthermore, the support tube is provided with a first mounting hole and a mounting groove, an excitation coil is installed in the mounting groove, and the lining is provided with a second mounting hole, and the first mounting hole is connected to the second mounting hole.

[0009] Furthermore, an electrode, an insulating pad and an electrode nut are sequentially installed in the first mounting hole, and an inner wall of the electrode is in smooth contact with an inner wall of the liner.

[0010] Furthermore, the electrode and the insulating pad are fixed in the first mounting hole through an electrode nut.

[0011] Furthermore, the electrode is electrically connected to the circuit board.

[0012] The above technical scheme is adopted, and the advantages of the present invention are: the upper end of the upper joint is provided with a cable head, which can be connected to a steel pipe cable and used as a direct-reading instrument. The ground equipment supplies power to the device through the steel pipe cable, and realizes two-way communication between the ground equipment and the downhole device. A battery pack is installed inside the device. When the steel pipe cable is normal, the direct-reading working mode is adopted, and the steel pipe cable directly provides electric energy. When the steel pipe cable is damaged and cannot supply power to the downhole instrument normally, the internal circuit detects the abnormality, stops the direct-reading working mode, starts the battery pack, and switches to the storage working mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a front cross-sectional view of the device; Figure 2 is a side cross-sectional view of the device; Figure 3 It is a schematic diagram of the shape of the circuit board; Figure 4 A schematic diagram of the battery pack shape; In the figure: shell 1, upper joint 2, eccentric hole 3, lower joint 4, support tube 5, lining 6, battery cavity 7, battery rack 8, battery pack 9, slot 10, circuit board 11, cable head 12, clamping nut 13, sealing ball 14, sealing plug 15, rubber tail 16, steel pipe cable 17, clamping screw plug 18, first mounting hole 19, second mounting hole 20, insulating pad 21, excitation coil 22, electrode nut 23, O-ring 24, electrode 25, mounting groove 26. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, 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. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0015] The terms "first", "second", etc. (if any) in the specification and claims of the present invention are used to distinguish similar objects, rather than to describe a specific order or sequence. Even if "second" is used to distinguish before a certain technical feature, it does not necessarily indicate that "first" is present. It should be understood that in the present invention, "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. It should be understood that in the present invention, "multiple" refers to two or more. "And / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, X and / or Y can represent: X exists alone, X and Y exist at the same time, and Y exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "Including X, Y and Z", "Including X, Y, Z" means that X, Y, and Z are all included, "Including X, Y or Z" means that one of X, Y, and Z is included, and "Including X, Y and / or Z" means that any one, any two, or three of X, Y, and Z are included.

[0016] like Figure 1 to Figure 2 As shown, the present invention provides a downhole flow testing device, including a hollow shell 1, a support tube 5 arranged inside the shell 1 and a lining 6 arranged on the inner wall of the support tube 5, the shell 1 includes an upper joint 2 and a lower joint 4, a battery cavity 7 is defined between the upper joint 2 and the support tube 5, a battery rack 8 is installed in the battery cavity 7, a battery pack 9 is arranged on the battery rack 8, a card slot 10 is provided below the battery cavity 7, a circuit board 11 is installed in the card slot 10, the circuit board 11 is electrically connected to the battery pack 9, an eccentric hole 3 is opened on the upper joint 2, a cable head 12 is installed in the eccentric hole 3, the upper end of the cable head 12 is connected to the steel pipe cable 17, and the lower end is electrically connected to the circuit board 11.

[0017] The present invention can connect the steel pipe cable 17 through the cable head 12 at the upper end of the upper connector 2 and use it as a direct-reading instrument. The ground equipment supplies power to the device through the steel pipe cable 17, and realizes two-way communication between the ground equipment and the downhole device. A battery pack 9 is installed inside the device. When the steel pipe cable 17 is normal, the direct-reading working mode is adopted, and the steel pipe cable 17 directly provides electric energy. When the steel pipe cable 17 is damaged and cannot supply power to the downhole instrument normally, the internal circuit detects the abnormality, stops the direct-reading working mode, starts the battery pack 9, and switches to the storage working mode.

[0018] Of course, in order to ensure the sealing between the cable head 12 and the eccentric hole 3 , an O-ring 24 is also provided between the cable head 12 and the eccentric hole 3 to prevent the external oil-water-gas mixture from entering the interior of the cable head 12 .

[0019] The support tube 5 is made of non-magnetic metal material, and a reasonable gap is designed between the support tube 5 and the inner liner 6, which can increase the pressure resistance of the inner liner 6 and prevent the influence of thermal expansion and contraction on the material. The support tube 5 is equipped with multiple O-rings 24, which cooperate with the inner liner 6 to prevent the internal oil-water-gas mixture from entering the device.

[0020] Specifically, the cable head 12 includes a clamping nut 13 and a sealing ball 14 installed at the upper end of the cable head 12 . The clamping nut 13 is installed above the sealing ball 14 . The steel pipe cable 17 passes through the clamping nut 13 and the sealing ball 14 in sequence and is arranged in the cable head 12 .

[0021] The sealing ball 14 is made of copper alloy, and the compression nut 13 squeezes and deforms the sealing ball 14 to serve as a metal seal. On the one hand, it fixes the steel pipe cable 17, and on the other hand, it prevents the external oil-water-gas mixture from entering the interior of the cable head 12.

[0022] Specifically, a sealing plug 15 is installed at the lower end of the cable head 12, and a rubber tail 16 is installed on the sealing plug 15. The steel tube cable 17 passes through the clamping nut 13 and the sealing ball 14 in sequence and is connected to the rubber tail 16. At the same time, in order to fix the sealing plug 15, the sealing plug 15 is fixed in the eccentric hole 3 by a clamping screw plug 18.

[0023] Specifically, the support tube 5 is provided with a first mounting hole 19 and a mounting groove 26, an excitation coil 22 is installed in the mounting groove 26, the lining 6 is provided with a second mounting hole 20, the first mounting hole 19 is communicated with the second mounting hole 20, an electrode 25, an insulating pad 21 and an electrode nut 23 are sequentially installed in the first mounting hole 19, the inner wall of the electrode 25 is in smooth contact with the inner wall of the lining 6, the electrode 25 and the insulating pad 21 are fixed in the mounting groove 19 through the electrode nut 23, and the electrode 25 is electrically connected to the circuit board 11 to ensure the power source of the electrode 25.

[0024] In this embodiment, if Figure 3 and Figure 4 As shown, the circuit board 11 and the battery pack 9 are both U-shaped, which is convenient for workers to disassemble and install.

[0025] In addition to the above-mentioned preferred embodiments, the present invention also has other implementation modes. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present invention.

Claims

1. A downhole flow testing device, comprising a hollow housing (1), a support tube (5) arranged inside the housing (1), and an inner lining (6) arranged on the inner wall of the support tube (5), wherein the housing (1) comprises an upper joint (2) and a lower joint (4), and is characterized in that: A battery cavity (7) is defined between the upper connector (2) and the support tube (5), a battery rack (8) is installed in the battery cavity (7), a battery pack (9) is provided on the battery rack (8), a card slot (10) is provided below the battery cavity (7), a circuit board (11) is installed in the card slot (10), the circuit board (11) is electrically connected to the battery pack (9), an eccentric hole (3) is provided on the upper connector (2), a cable head (12) is installed in the eccentric hole (3), the upper end of the cable head (12) is connected to the steel pipe cable (17), and the lower end is electrically connected to the circuit board (11).

2. The downhole flow testing device according to claim 1, characterized in that: The cable head (12) comprises a clamping nut (13) and a sealing ball (14) mounted on the upper end of the cable head (12); the clamping nut (13) is mounted above the sealing ball (14); and the steel tube cable (17) passes through the clamping nut (13) and the sealing ball (14) in sequence and is arranged in the cable head (12).

3. The downhole flow testing device according to claim 2, characterized in that: A sealing plug (15) is installed at the lower end of the cable head (12), a rubber tail (16) is installed on the sealing plug (15), and the steel tube cable (17) passes through the clamping nut (13) and the sealing ball (14) in sequence and is connected to the rubber tail (16).

4. The downhole flow testing device according to claim 3, characterized in that: The sealing plug (15) is fixed in the eccentric hole (3) by means of a compression screw plug (18).

5. The downhole flow testing device according to claim 1, characterized in that: The support tube (5) is provided with a first mounting hole (19) and a mounting groove (26), an excitation coil (22) is mounted in the mounting groove, the lining (6) is provided with a second mounting hole (20), and the first mounting hole (19) is in communication with the second mounting hole (20).

6. The downhole flow rate testing device according to claim 5, characterized in that: An electrode (25), an insulating pad (21) and an electrode nut (23) are sequentially installed in the first installation hole (19), and the inner wall of the electrode (25) is in smooth contact with the inner wall of the liner (6).

7. The downhole flow rate testing device according to claim 6, characterized in that: The electrode (25) and the insulating pad (21) are fixed in the first mounting hole (19) via an electrode nut (23).

8. The downhole flow rate testing device according to claim 6, characterized in that: The electrode (25) is electrically connected to the circuit board (11).

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