A power supply separation type oil well liquid level dynamic monitoring instrument

Abstract

The present invention proposes a power-separated oil well liquid level dynamic monitor, comprising: a first flameproof box and a second flameproof box; a first power supply, a second power supply and an air pump are arranged in the first flameproof box, and the outlet of the air pump is connected to the oil well casing through a pneumatic pipeline; a measurement and control terminal and a pressure-stabilizing tank are arranged in the second flameproof box, the inlet of the pressure-stabilizing tank is directly or indirectly connected to the oil well casing, a microphone is installed in the pressure-stabilizing tank, the microphone is connected to the measurement and control terminal signal, the outlet of the pressure-stabilizing tank is connected to an exhaust pipe, and the exhaust pipe is connected to a pressure transmitter and a solenoid valve; wherein the first power supply is electrically connected to the air pump, and the second power supply is electrically connected to the measurement and control terminal, the microphone and the pressure transmitter. The power-separated oil well liquid level dynamic monitor of the present invention can keep the air pump and the power supply away from the wellhead, and at the same time prevent the instantaneous current of the air pump from starting up from impacting the power supply of the measurement and control terminal, thereby ensuring the safe operation of the measurement and control terminal and eliminating the safety hazards at the wellhead.

Description

Technical Field

[0001] The invention belongs to the field of oil well detection, and in particular relates to a power-separated type oil well liquid level dynamic monitoring instrument. Background Art

[0002] The current oil well liquid level dynamic monitoring instrument is used at the wellhead of the oil well. For wells with low casing pressure (below 0.5MPa), an air pump is required to pump air into the casing, and pneumatic pipelines and supporting solenoid valves, pressure transmitters, etc. are added. However, the instantaneous current when the air pump is started will produce a power supply shock to the measurement and control terminal, causing damage to the measurement and control terminal. In addition, the air pump and power supply are installed near the wellhead along with the measurement and control terminal, where combustible gas leakage is likely to occur, and the power supply and air pump are prone to sparks, posing a safety hazard. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a power-separated oil well liquid level dynamic monitoring instrument for overcoming the above-mentioned problems or at least partially solving or alleviating the above-mentioned problems.

[0004] The present invention provides a power-separated oil well liquid level dynamic monitoring instrument, comprising:

[0005] A first flameproof box, which is arranged far away from the wellhead of the oil well, and is provided with a first power supply, a second power supply and an air pump, wherein the outlet of the air pump is connected to the casing of the oil well through a pneumatic pipeline;

[0006] A second flameproof box, wherein the second flameproof box is arranged at the wellhead, a measurement and control terminal and a pressure-stabilizing tank are arranged in the second flameproof box, the inlet of the pressure-stabilizing tank is directly or indirectly connected to the casing of the oil well, a microphone is installed in the pressure-stabilizing tank, the microphone is connected to the measurement and control terminal signal, the outlet of the pressure-stabilizing tank is connected to an exhaust pipe, a pressure transmitter and a solenoid valve are connected to the exhaust pipe, the pressure transmitter and the solenoid valve are connected to the measurement and control terminal signal, and the exhaust pipe leads out of the second flameproof box;

[0007] Wherein, the first power supply is electrically connected to the air pump, and the second power supply is electrically connected to the measurement and control terminal, the microphone and the pressure transmitter.

[0008] The present invention also has the following optional features.

[0009] Optionally, the pressure transmitter includes a first pressure transmitter and a second pressure transmitter, the exhaust pipe includes a first exhaust pipe and a second exhaust pipe, the pressure stabilizing tank has two outlets, which are respectively connected to the first exhaust pipe and the second exhaust pipe, the first exhaust pipe is connected to the first pressure transmitter and a normally closed solenoid valve, the other end of the first exhaust pipe leads to the atmosphere, the second exhaust pipe is connected to the second pressure transmitter and a normally open solenoid valve, and the other end of the second exhaust pipe is connected to the jacket gas recovery pipeline.

[0010] Optionally, a first explosion-proof joint is provided on the second explosion-proof box, and the inlet of the surge tank is connected to the outside of the second explosion-proof box through the first explosion-proof joint.

[0011] Optionally, a connecting sleeve and a pressure cover are connected to the inlet of the pressure-stabilizing tank, the pressure cover is located on the inner side of the shell, the first explosion-proof joint includes an explosion-proof interface, a round nut and a stuffing box are arranged in the explosion-proof interface, a pipe plug is connected to the port of the explosion-proof interface, and the connecting sleeve passes through the round nut, the stuffing box and the pipe plug and then passes out of the shell.

[0012] Optionally, the outer end of the connecting sleeve is connected to a ball valve and a tee in sequence.

[0013] Optionally, two second explosion-proof joints are provided on the second explosion-proof box, each of the second explosion-proof joints includes an explosion-proof interface, a stuffing box and a pipe plug are provided in the explosion-proof interface, and the first exhaust pipe and the second exhaust pipe respectively pass through the stuffing box and the pipe plug in each of the second explosion-proof joints to exit the second explosion-proof box.

[0014] Optionally, it also includes an antenna, which is connected to the signal output end of the measurement and control terminal through a signal line; the antenna extends out of the second explosion-proof joint.

[0015] Optionally, a third explosion-proof joint is provided on the second explosion-proof box, and the third explosion-proof joint includes an explosion-proof interface, and a fixing seat, a stuffing box and a pipe plug are provided in the explosion-proof interface. The antenna is connected to the fixing seat and passes through the stuffing box and the pipe plug to extend out of the second explosion-proof box.

[0016] Optionally, a fourth explosion-proof joint is further provided on the second explosion-proof box, and the fourth explosion-proof joint includes an explosion-proof interface, and the explosion-proof interface is provided with a stuffing box, a pipe plug and an explosion-proof socket from the inside to the outside. The explosion-proof socket is connected to a cable, and the cable passes through the pipe plug and the stuffing box into the second explosion-proof box, and is connected to the measurement and control terminal.

[0017] Optionally, the outsides of the first explosion-proof box and the second explosion-proof box are both connected to support frames.

[0018] For wells with higher casing pressure, the power-separated oil well liquid level dynamic monitor of the present invention can directly use high-pressure casing gas to measure the oil well liquid level. For wells with lower casing pressure, an air pump is used to pump air into the casing, but an independent power supply is used to power the air pump separately. The air pump and the power supply are separated from the measurement and control terminal, and the air pump and the power supply are kept away from the wellhead. At the same time, the instantaneous current caused by the start-up of the air pump is prevented from impacting the power supply of the measurement and control terminal, thereby ensuring the safe operation of the measurement and control terminal and eliminating safety hazards at the wellhead. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the power-separated oil well liquid level dynamic monitoring instrument of the present invention;

[0020] Figure 2 yes Figure 1 The internal structure diagram of the first explosion-proof box;

[0021] Figure 3 yes Figure 1 The internal structure diagram of the second explosion-proof box;

[0022] Figure 4 yes Figure 3 A schematic diagram of the structure of the first explosion-proof joint;

[0023] Figure 5 yes Figure 3 A schematic diagram of the structure of the second explosion-proof joint;

[0024] Figure 6 yes Figure 3 A schematic diagram of the structure of the third explosion-proof joint;

[0025] Figure 7 yes Figure 3 Schematic diagram of the structure of the fourth explosion-proof joint.

[0026] In the above figure: 1 the first explosion-proof box; 2 the first power supply; 3 the second power supply; 4 the air pump; 5 the second explosion-proof box; 6 the measurement and control terminal; 7 the pressure-stabilizing tank; 8 the first pressure transmitter; 9 the second pressure transmitter; 10 the first exhaust pipe; 11 the second exhaust pipe; 12 the normally closed solenoid valve; 13 the normally open solenoid valve; 14 the first explosion-proof joint; 15 the connecting sleeve; 16 the pressure cover; 17 the ball valve; 18 the tee; 19 the second explosion-proof joint; 20 the explosion-proof interface; 21 the round nut; 22 the stuffing box; 23 the pipe plug; 24 the antenna; 25 the third explosion-proof joint; 26 the fixing seat; 27 the fourth explosion-proof joint; 28 the explosion-proof socket; 29 the supporting frame.

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0028] Example 1

[0029] refer to Figure 1 , Figure 2 and Figure 3 The embodiment of the present invention provides a power-separated oil well liquid level dynamic monitor, comprising: a first flameproof box 1 and a second flameproof box 5; the first flameproof box 1 is arranged away from the wellhead of the oil well, and a first power supply 2, a second power supply 3 and an air pump 4 are arranged in the first flameproof box 1, and the outlet of the air pump 4 is connected to the oil well casing through a pneumatic pipeline; the second flameproof box 5 is arranged at the wellhead, and a measurement and control terminal 6 and a pressure-suppressing tank 7 are arranged in the second flameproof box 5, and the inlet of the pressure-suppressing tank 7 is directly or indirectly connected to the oil well casing, a microphone is installed in the pressure-suppressing tank 7, and the microphone is connected to the measurement and control terminal 6 for signal, and the outlet of the pressure-suppressing tank 7 is connected to an exhaust pipe, and a pressure transmitter and a solenoid valve are connected to the exhaust pipe, and the pressure transmitter and the solenoid valve are connected to the measurement and control terminal 6 for signal, and the exhaust pipe leads to the outside of the second flameproof box 5; wherein, the first power supply 2 is electrically connected to the air pump 4, and the second power supply is electrically connected to the measurement and control terminal 6, the microphone and the pressure transmitter.

[0030] The first flameproof box 1 is fixed at a position far away from the wellhead, and the first power supply 2 and the second power supply 3 in the first flameproof box 1 are electrically connected to the control box of the oil pump; a relay is electrically connected between the first power supply 2 and the air pump 4, and the measurement and control terminal 6 is connected to the relay electrical signal; the second flameproof box 5 is arranged on the oil tree at the wellhead, and a pressure-stabilizing tank 7 is arranged in the second flameproof box 5. The inlet of the pressure-stabilizing tank 7 extends out of the second flameproof box 5 and is connected to a pipeline connected to the oil well casing, so that the casing gas in the oil well casing is introduced into the pressure-stabilizing tank 7.

[0031] When monitoring the liquid level in the oil well, the measurement and control terminal 6 starts the air pump 4 through the relay to increase the pressure inside the oil well casing, and then opens the solenoid valve on the exhaust pipe. The exhaust pipe emits a whistle sound wave, which is transmitted to the oil well casing and then returns. The microphone in the pressure regulating tank 7 sends the sound wave signal returned in the casing gas pipeline to the measurement and control terminal 6, and the pressure transmitter sends the casing gas pressure to the measurement and control terminal 6. The measurement and control terminal 6 converts the height of the liquid level in the oil well casing according to the above signal, so that the staff can adjust the pumping depth of the oil well pump to avoid empty pumping of the oil well pump, thereby improving the oil production efficiency and reducing the oil production consumption.

[0032] Example 2

[0033] Based on Example 1, Figure 3The pressure transmitter includes a first pressure transmitter 8 and a second pressure transmitter 9, the exhaust pipe includes a first exhaust pipe 10 and a second exhaust pipe 11, the pressure stabilizing tank 7 has two outlets, which are respectively connected to the first exhaust pipe 10 and the second exhaust pipe 11, the first exhaust pipe 10 is connected to the first pressure transmitter 8 and the normally closed solenoid valve 12, the other end of the first exhaust pipe 10 leads to the atmosphere, the second exhaust pipe 11 is connected to the second pressure transmitter 9 and the normally open solenoid valve 13, and the other end of the second exhaust pipe 11 is connected to the jacket gas recovery pipeline.

[0034] The second exhaust pipe 11 is connected to the casing gas recovery pipeline, which can recover the casing gas of the oil well. The measurement and control terminal 6 can monitor the pressure inside the casing gas recovery pipeline through the second pressure transmitter 9. When monitoring the liquid level of the oil well, the measurement and control terminal 6 closes the normally open solenoid valve 13 on the second exhaust pipe 11, and then starts the air pump 4 to increase the pressure of the oil well casing, and finally opens the normally closed solenoid valve 12 on the first exhaust pipe 10, so that the first exhaust pipe 10 emits a whistle sound wave, and detects the casing gas pressure through the first pressure transmitter 8.

[0035] Example 3

[0036] Based on Example 1, Figure 3 A first explosion-proof joint 14 is provided on the second explosion-proof box 5 , and the inlet of the surge tank 7 is connected to the outside of the second explosion-proof box 5 through the first explosion-proof joint 14 .

[0037] The inlet of the pressure-stabilizing tank 7 is connected to the outside of the second explosion-proof box 5 through the first explosion-proof joint 14. The first explosion-proof joint 14 can improve the sealing between the inlet of the pressure-stabilizing tank 7 and the interior of the second explosion-proof box 5, and can effectively prevent the combustible gas in the sheath gas pipeline from entering the second explosion-proof box 5 and contacting the circuit-related parts such as the measurement and control terminal 6 and the solenoid valve, thereby preventing the combustible gas from being ignited and causing an explosion accident.

[0038] Example 4

[0039] refer to Figure 4 On the basis of Example 3, a connecting sleeve 15 and a pressure cover 16 are connected to the inlet of the pressure-surge tank 7, and the pressure cover 16 is located on the inner side of the second explosion-proof box 5. The first explosion-proof joint 14 includes an explosion-proof interface 20, and a round nut 21 and a stuffing box 22 are arranged in the explosion-proof interface 20. A pipe plug 23 is connected to the port of the explosion-proof interface 20, and the connecting sleeve 15 passes through the round nut 21, the stuffing box 22 and the pipe plug 23 and then passes out of the second explosion-proof box 5.

[0040] The upper port of the connecting sleeve 15 is connected to the inlet of the pressure-stabilizing tank 7 through the pressure cap 16. The connecting sleeve 15 is connected to the sleeve air pipeline after passing through the first explosion-proof joint 14. The connecting sleeve 15 is provided with a thread at the place where it passes through the second explosion-proof box 5, and is connected with a round nut 21 through the thread, so that it is relatively fixed to the second explosion-proof box 5. The connecting sleeve 15 is filled with a stuffing box 22 in the explosion-proof interface 20 for sealing. The port of the explosion-proof interface 20 is connected with a pipe plug 23 through a thread, and the stuffing box 22 is fixed between the explosion-proof interface 20 and the connecting sleeve 15.

[0041] Example 5

[0042] refer to Figure 3 On the basis of Example 4, the outer end of the connecting sleeve 15 is connected with a ball valve 17 and a tee 18 in sequence.

[0043] The end of the connecting sleeve 15 is connected to a tee 18, which is connected to the sleeve gas pipeline through the tee 18 so that the connecting sleeve 15 can remain in a vertical state. The ball valve 17 between the connecting sleeve 15 and the tee 18 can control the conduction or closing of the connecting sleeve 15. Only after the ball valve 17 is opened can the sleeve gas be introduced from the connecting sleeve 15 into the pressure regulating tank 7.

[0044] Example 6

[0045] refer to Figure 3 On the basis of Example 1, two second explosion-proof joints 19 are provided on the second explosion-proof box 5, each of the second explosion-proof joints 19 includes an explosion-proof interface 20, a stuffing box 22 and a pipe plug 23 are provided in the explosion-proof interface 20, and the first exhaust pipe 10 and the second exhaust pipe 11 pass through the stuffing box 22 and the pipe plug 23 in each second explosion-proof joint 19 respectively to the outside of the second explosion-proof box 5.

[0046] Stuffing boxes 13 are respectively installed between the first exhaust pipe 10 and the second exhaust pipe 11 and the explosion-proof interface 26 in the second explosion-proof joint 17 passed through, and are blocked by pipe plugs 14. The first exhaust pipe 10 is vertically arranged along the second explosion-proof joint 17 passed through, and the second exhaust pipe 10 is horizontally arranged along the second explosion-proof joint 17 passed through. An elbow can be installed at the end of the first exhaust pipe 10 to prevent rainwater from flowing in.

[0047] Example 7

[0048] refer to Figure 3 On the basis of Example 1, it further includes an antenna 24, which is connected to the signal output end of the measurement and control terminal 6 through a signal line; the antenna 24 extends out of the second explosion-proof joint 19.

[0049] When the measurement and control terminal 6 can transmit signals through the antenna 24 , the antenna 24 is connected to the signal transmission port of the measurement and control terminal 6 through a signal line, and the end of the antenna 24 extends out of the second flameproof box 5 .

[0050] Example 8

[0051] refer to Figure 6 On the basis of Example 5, a third explosion-proof joint 25 is provided on the second explosion-proof box 5, and the third explosion-proof joint 25 includes an explosion-proof interface 20, and a fixing seat 26, a stuffing box 22 and a pipe plug 23 are provided in the explosion-proof interface 20. The antenna 24 is connected to the fixing seat 26, and passes through the stuffing box 22 and the pipe plug 23 to extend out of the second explosion-proof box 5.

[0052] A fixing seat 26 is provided in the explosion-proof interface 20 in the third explosion-proof joint 25, and the root of the antenna 24 is connected to the fixing seat 26. The internal signal line passes through the fixing seat 26 and is connected to the signal sending end of the second explosion-proof box 5 and the measurement and control terminal 6. A stuffing box 22 is filled between the fixing seat 26 and the explosion-proof interface 20 and is sealed by a pipe plug 23.

[0053] Example 9

[0054] refer to Figure 7 On the basis of Example 1, a fourth explosion-proof joint 21 is further provided on the second explosion-proof box 5, and the fourth explosion-proof joint 27 includes an explosion-proof interface 26. The explosion-proof interface 26 is provided with a stuffing box 13, an inner square pipe plug 23 and an explosion-proof socket 22 from the inside to the outside. The explosion-proof socket 22 is connected with a cable, and the cable passes through the pipe plug 23 and the stuffing box 22 into the second explosion-proof box 5, and is connected to the measurement and control terminal 6.

[0055] The measurement and control terminal 6 can also be powered and transmit signals through an external cable. A fourth explosion-proof joint 27 is arranged on the second explosion-proof box 5. The explosion-proof interface 26 in the fourth explosion-proof joint 27 is provided with a stuffing box 13 and a pipe plug 23. The port of the explosion-proof interface 26 is connected to an explosion-proof socket 28. The cable on the explosion-proof socket 28 passes through the pipe plug 23 and the stuffing box 22 and enters the second explosion-proof box 5 to be connected to the measurement and control terminal 1.

[0056] Example 10

[0057] refer to Figure 2 and Figure 3 The first flameproof box 1 and the second flameproof box 5 are both connected to the outside with a support frame 29 .

[0058] The lower parts of the first flameproof box 1 and the second flameproof box 5 are both connected with a support frame 29 to keep the first flameproof box 1 and the second flameproof box 5 in an upright state.

[0059] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims. The components and structures not described in detail in this embodiment are well-known components and common structures or common means in the industry, and are not described here one by one.

Claims

1. A power-separated oil well liquid level dynamic monitor, characterized in that: include: A first flameproof box (1), the first flameproof box (1) being arranged away from the wellhead of the oil well, the first flameproof box (1) being provided with a first power source (2), a second power source (3) and an air pump (4), the outlet of the air pump (4) being connected to the casing of the oil well via a pneumatic pipeline; a second flameproof box (5), the second flameproof box (5) being arranged at the wellhead, a measurement and control terminal (6) and a pressure-stabilizing tank (7) being arranged in the second flameproof box (5), the inlet of the pressure-stabilizing tank (7) being directly or indirectly connected to the casing of the oil well, a microphone being installed in the pressure-stabilizing tank (7), the microphone being connected to the measurement and control terminal (6) for signal, an exhaust pipe being connected to the exhaust pipe, a pressure transmitter and an electromagnetic valve being connected to the measurement and control terminal (6) for signal, and the exhaust pipe leading out of the second flameproof box (5); The first power source (2) is electrically connected to the air pump (4), and the second power source (3) is electrically connected to the measurement and control terminal (6), the microphone and the pressure transmitter; The pressure transmitter comprises a first pressure transmitter (8) and a second pressure transmitter (9); the exhaust pipe comprises a first exhaust pipe (10) and a second exhaust pipe (11); the pressure stabilizing tank (7) has two outlets, which are respectively connected to the first exhaust pipe (10) and the second exhaust pipe (11); the first exhaust pipe (10) is connected to the first pressure transmitter (8) and a normally closed solenoid valve (12); the other end of the first exhaust pipe (10) leads to the atmosphere; the second exhaust pipe (11) is connected to the second pressure transmitter (9) and a normally open solenoid valve (13); the other end of the second exhaust pipe (11) is connected to a jacket gas recovery pipeline; The second explosion-proof box (5) is provided with a first explosion-proof joint (14), and the inlet of the surge tank (7) is connected to the outside of the second explosion-proof box (5) through the first explosion-proof joint (14); The second explosion-proof box (5) is provided with two second explosion-proof joints (19), each of the second explosion-proof joints (19) comprises an explosion-proof interface (20), a stuffing box (22) and a pipe plug (23) are provided in the explosion-proof interface (20), and the first exhaust pipe (10) and the second exhaust pipe (11) respectively pass through the stuffing box (22) and the pipe plug (23) in each of the second explosion-proof joints (19) to exit the second explosion-proof box (5); It also includes an antenna (24), the antenna (24) being connected to a signal output end of the measurement and control terminal (6) via a signal line; the antenna (24) extending out of the second explosion-proof connector (19).

2. The power-separated oil well liquid level dynamic monitor according to claim 1, characterized in that: The inlet of the pressure-stabilizing tank (7) is connected to a connecting sleeve (15) and a gland (16), the gland (16) is located on the inner side of the second explosion-proof box (5), the first explosion-proof joint (14) comprises an explosion-proof interface (20), a round nut (21) and a stuffing box (22) are arranged inside the explosion-proof interface (20), a pipe plug (23) is connected to the port of the explosion-proof interface (20), and the connecting sleeve (15) passes through the round nut (21), the stuffing box (22) and the pipe plug (23) and then passes out of the second explosion-proof box (5).

3. The power-separated oil well liquid level dynamic monitor according to claim 2, characterized in that: The outer end of the connecting sleeve (15) is connected in sequence to a ball valve (17) and a three-way connection (18).

4. The power-separated oil well liquid level dynamic monitoring instrument according to claim 1, characterized in that: A third explosion-proof joint (25) is provided on the second explosion-proof box (5), the third explosion-proof joint (25) comprising an explosion-proof interface (20), a fixing seat (26), a stuffing box (22) and a pipe plug (23) being provided inside the explosion-proof interface (20), the antenna (24) being connected to the fixing seat (26) and passing through the stuffing box (22) and the pipe plug (23) to extend out of the second explosion-proof box (5).

5. The power-separated oil well liquid level dynamic monitoring instrument according to claim 1, characterized in that: The second explosion-proof box (5) is further provided with a fourth explosion-proof joint (27), the fourth explosion-proof joint (27) comprising an explosion-proof interface (20), the explosion-proof interface (20) being provided with a stuffing box (22), a pipe plug (23) and an explosion-proof socket (28) in sequence from the inside to the outside, the explosion-proof socket (28) being connected with a cable, the cable passing through the pipe plug (23) and the stuffing box (22) and entering the second explosion-proof box (5), and being connected to the measurement and control terminal (6).

6. The power-separated oil well liquid level dynamic monitoring instrument according to claim 1, characterized in that: The outside of the first flameproof box (1) and the second flameproof box (5) are both connected to a support frame (29).

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