Dynamic liquid level monitoring device for oil well

Abstract

The utility model discloses an oil well dynamic liquid level monitoring device, which belongs to the technical field of oil well liquid level monitoring, solves the problem of insufficient data reliability caused by the fact that the measurement accuracy of a traditional device is easily influenced by environmental factors such as fluid disturbance in a well and temperature change, and comprises a monitoring pipe which is arranged on the ground near an acquisition well and extends into the well, through holes are distributed in the periphery of a monitoring pipe in a well, a mounting shell is mounted at the top end of the monitoring pipe above the ground, a floating ball extending into the monitoring pipe is mounted in the mounting shell through a rope, the tension change of the rope is detected in real time through a tension sensor, and the height of the liquid level can be accurately reflected by combining the buoyancy effect of the floating ball on the liquid level; the laser meter counter directly measures the length of the rope extending into the monitoring pipe, double measurement ensures data accuracy, a servo motor of the winch drives a reel to automatically wind and unwind the rope, the position of the base is adjusted in cooperation with an electric push rod, and automatic lowering and recovery of the floating ball are achieved.

Description

Technical Field

[0001] A dynamic fluid level monitoring device for oil wells. This utility model belongs to the field of oil well fluid level monitoring technology, specifically relating to the field of dynamic fluid level monitoring devices for oil wells. Background Technology

[0002] In oil extraction, monitoring the dynamic fluid level in oil wells is a crucial step in assessing well production status and optimizing extraction processes. Traditional methods for monitoring oil well fluid levels often rely on manual measurement or simple mechanical devices, which have the following drawbacks: manual measurement suffers from large errors and low efficiency, and cannot achieve real-time monitoring; existing mechanical devices are typically complex in structure, have a delayed response to fluid level fluctuations, and struggle to accurately measure fluid depth; some devices rely on manual deployment and retraction of measuring components, which is cumbersome and poses safety hazards under complex well conditions; furthermore, the measurement accuracy of traditional devices is easily affected by environmental factors (such as fluid disturbances and temperature changes within the well), leading to insufficient data reliability. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the existing defects and provide a dynamic fluid level monitoring device for oil wells, thereby solving the problem that the measurement accuracy of traditional devices is easily affected by environmental factors such as fluid disturbance and temperature changes in the well, resulting in insufficient data reliability.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] An oil well dynamic fluid level monitoring device includes a monitoring pipe installed on the ground near the collection well and extending into the well. Through holes are distributed around the monitoring pipe inside the well. An installation shell is installed at the top of the monitoring pipe above the ground. A float ball extending into the monitoring pipe is installed inside the installation shell via a rope. A tension detection structure for measuring the tension on the rope is installed inside the installation shell. A winch for retracting and extending the rope is installed inside the installation shell. A laser meter is also installed inside the installation shell to measure the length of the rope extending into the monitoring pipe.

[0006] As a preferred technical solution of this utility model, the tensile force detection structure includes a pulley installed inside the mounting housing, both ends of the pulley are connected to a sliding seat through a rotating shaft, a vertical rod is installed inside the mounting housing at the position corresponding to the sliding seat, and a tensile force sensor is connected above the sliding seat through a spring.

[0007] As a preferred embodiment of this utility model, the winch includes a base, a reel is mounted on the surface of the base, a servo motor is mounted on the side of the reel, one end of the cable is fixed to the reel, and the other end of the cable is connected to a float via a threaded connection structure.

[0008] As a preferred embodiment of this utility model, a guide rod is installed inside the mounting shell, the base is slidably mounted on the outside of the guide rod, and the inner side of the mounting shell is connected to the base via an electric push rod.

[0009] Compared with the prior art, the beneficial effects of this utility model are: by using a tension sensor to detect the change in tension of the rope in real time, combined with the buoyancy of the float on the liquid surface, the liquid level height can be accurately reflected; the laser meter directly measures the length of the rope extending into the monitoring tube, and the dual measurement ensures the accuracy of the data.

[0010] The winch's servo motor drives the reel to automatically wind up and unwind the rope, and in conjunction with the electric push rod to adjust the position of the base, it realizes the automatic lowering and retrieval of the float, reducing manual intervention.

[0011] The spring in the tensile testing structure can mitigate the interference of buffer surface fluctuations on tensile force measurement, and the cooperation between the pulley and the sliding seat ensures that the cable is subjected to stable force. The through-hole design of the monitoring tube can balance the pressure inside and outside the well and avoid fluid impact affecting the measurement.

[0012] The device can adapt to different well depths and fluid level fluctuation frequencies. By adjusting the position of the winch through the electric push rod, it can flexibly cope with complex working conditions in the well and improve monitoring stability. Furthermore, when making measurements, preliminary data can be obtained first through the winch, and then the operation of the electric push rod can be controlled to drive the float to move up and down, thereby measuring accurate fluid level data. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0014] Figure 2 This is a schematic diagram of the internal three-dimensional structure of the present invention;

[0015] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0016] Figure 4 For the present utility model Figure 2 A magnified view of a portion of the image;

[0017] 1-Monitoring tube; 2-Through hole; 3-Ground; 4-Mounting shell; 5-Wind; 6-Rope; 7-Float; 8-Laser meter counter; 9-Pulley; 10-Pressure detection structure; 11-Guide rod; 12-Electric push rod; 13-Electric control box; 14-Limit roller; 15-Connecting shaft; 16-Slider; 17-Horizontal bar; 18-Spring 1; 19-Tension / compression sensor; 20-Limit groove; 21-Rotating shaft; 22-Sliding seat; 23-Vertical rod; 24-Spring 2; 25-Tension sensor; 26-Base; 27-Servo motor; 28-Reel. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1-4 This utility model provides a technical solution:

[0020] An oil well dynamic fluid level monitoring device includes the following structure:

[0021] Main structure: A monitoring pipe 1 is installed on the ground 3 near the collection well. The monitoring pipe 1 extends into the well, and through holes 2 are distributed around it. A mounting shell 4 is installed at the top of the monitoring pipe 1 above the ground 3. A float 7 extending into the monitoring pipe 1 is connected to the inside of the mounting shell 4 by a rope 6. The mounting shell 4 is equipped with a tension detection structure, a winch 5, and a laser meter 8, wherein:

[0022] Tension detection structure: includes a pulley 9 installed inside the mounting housing 4, with both ends of the pulley 9 connected to a sliding seat 22 via a rotating shaft 21, a vertical rod 23 installed inside the mounting housing 4 at the position corresponding to the sliding seat 22, and a tension sensor 25 connected above the sliding seat 22 via a spring 24.

[0023] Winch 5: includes a base 26, a reel 28 is mounted on the surface of the base 26, a servo motor 27 is set on the side of the reel 28, one end of the cable 6 is fixed on the reel 28, and the other end is connected to the float 7 through a threaded connection structure.

[0024] Auxiliary structure: A guide rod 11 is installed inside the mounting shell 4, and the base 26 is slidably installed outside the guide rod 11. The inner side of the mounting shell 4 is connected to the base 26 through an electric push rod 12.

[0025] The offset measurement structure has limit rollers 14 installed at the top of the monitoring tubes 1 on both sides of the cable 6 to limit its movement. Both ends of the limit rollers 14 are connected to sliders 16 via connecting shafts 15. A crossbar 17 is installed inside the mounting shell 4, passing through the inside of the slider 16. The slider 16 slides on the crossbar 17. A tension / compression sensor 19 is installed on the surface of the crossbar 17 away from the slider 16, and the tension / compression sensor 19 is connected to the slider 16 via a spring 18.

[0026] Device installation and overall structure

[0027] A monitoring pipe 1 is vertically installed on the ground 3 near the oil well. The lower end of the monitoring pipe 1 extends into the well to a predetermined depth, and its wall has evenly distributed through holes 2 to balance the fluid pressure inside the well. A housing 4 is fixedly installed at the top of the monitoring pipe 1. The housing 4 integrates a winch 5, a tension detection structure, a laser meter 8, and a displacement measurement structure. Specifically, a limiting roller 14 is installed on each side of the cable 6 passing through the top of the monitoring pipe 1. The limiting roller 14 is fixedly connected to a slider 16 via a connecting shaft 15. The slider 16 is fitted onto a crossbar 17 inside the housing 4 and can slide laterally along the crossbar 17. A tension / compression sensor 19 is fixedly installed at the end of the crossbar 17 away from the slider 16, and the slider 16 and the tension / compression sensor 19 are elastically connected by a spring 18. The cable 6 passes around the limiting roller 14 and enters the monitoring pipe 1. Its end is fixed to a float 7 via a threaded connection structure. The float 7 can float up and down inside the monitoring pipe 1 with the fluid level.

[0028] Working principle of the limit roller structure

[0029] When the float 7 moves with the liquid level inside the monitoring tube 1, if the float 7 shifts laterally due to fluid disturbance or well inclination angle, the cable 6 will drive the limiting roller 14 to generate lateral pressure. At this time, the limiting roller 14 pushes the slider 16 to slide along the crossbar 17 via the connecting shaft 15. The slider 16 compresses or stretches the spring 18, thereby causing the tension and pressure sensor 19 to generate an electrical signal. The real-time measurement data of the tension and pressure sensor 19 can reflect the lateral offset force of the cable 6. By calculating the magnitude and direction of this force through an algorithm, the offset of the float 7 can be obtained. When the float 7 is in a vertical state, the limiting rollers 14 on both sides are in equilibrium, and the reading of the tension and pressure sensor 19 is zero. If the float 7 shifts, the difference in readings between the two sensors can quantify the degree of offset, thereby correcting the measurement data of the laser meter 8 and the tension sensor 25, eliminating the error caused by the offset, and improving the accuracy of liquid level measurement.

[0030] Coordinated operation of the tensile testing structure and the limiting components

[0031] In the tension detection structure, pulley 9 is mounted on sliding seat 22 via shaft 21. Sliding seat 22 slides along vertical rod 23 and is connected to tension sensor 25 via spring 24, used to detect changes in the vertical tension of rope 6. The limiting roller assembly monitors the lateral displacement of rope 6 in real time. The two work together: vertical tension data reflects the liquid level, and lateral displacement data corrects measurement deviations. For example, when float 7 deviates, the reading of tension sensor 25 may be erroneous due to changes in buoyancy. In this case, the offset data from tension / compression sensor 19 can compensate for this error, ensuring that the rope length data of laser meter 8 corresponds exactly to the actual liquid level depth.

[0032] Winch and Automated Rewind and Unwind Control

[0033] The base 26 of the winch 5 is slidably mounted inside the mounting housing 4 via guide rod 11 and its position is adjusted by an electric push rod 12. When the servo motor 27 drives the reel 28 to wind up or unwind the cable 6, the limiting roller 14 guides the cable 6 to maintain vertical movement, preventing the cable 6 from rubbing against or shifting off the top of the monitoring tube 1 during winding up or unwinding. When the electric push rod 12 adjusts the position of the base 26, the limiting roller assembly synchronously adapts to the angle change of the cable 6, ensuring that the tension / compression sensor 19 always accurately monitors the offset.

[0034] Data Acquisition and Error Correction Process

[0035] The laser meter counter 8 records the length of the rope 6 extending into the monitoring tube 1 in real time. The tension sensor 25 collects the vertical tension signal, and the tension / compression sensor 19 collects the lateral offset force signal. The system calculates the liquid level depth using the following logic:

[0036] When the reading of the tension and compression sensor 19 is zero, the float 7 is considered to be vertical, and the liquid level depth is calculated directly from the data of the laser meter 8.

[0037] When the reading of the tension and compression sensor 19 is non-zero, the lateral offset distance of the float 7 is calculated based on the magnitude of the offset force, and the length data of the laser meter 8 is corrected by combining the geometric relationship to eliminate the depth error caused by the offset.

[0038] The signal from the tension sensor 25 is used to verify the buoyancy balance state and ensure that the float 7 is in stable contact with the liquid surface.

[0039] By coordinating the limiting roller assembly with the original measuring structure, the device can compensate for float offset errors in real time and maintain high-precision liquid level monitoring even under complex working conditions such as fluid disturbance and well deviation in the well.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dynamic fluid level monitoring device for oil wells, comprising a monitoring pipe (1) installed on the ground (3) near the collection well and extending into the well, wherein through holes (2) are distributed around the monitoring pipe (1) in the well, characterized in that: An installation shell (4) is installed at the top of the monitoring tube (1) above the ground (3). A float (7) is installed inside the installation shell (4) via a rope (6) that extends into the monitoring tube (1). A tension detection structure for measuring the tension of the rope (6) is installed inside the installation shell (4). A winch (5) for winding and unwinding the rope (6) is installed inside the installation shell (4). A laser meter (8) for measuring the length of the rope (6) extending into the monitoring tube (1) is also installed inside the installation shell (4).

2. The oil well dynamic fluid level monitoring device according to claim 1, characterized in that: The tension detection structure includes a pulley (9) installed inside the mounting shell (4). Both ends of the pulley (9) are connected to a sliding seat (22) via a rotating shaft (21). A vertical rod (23) is installed inside the mounting shell (4) at the position corresponding to the sliding seat (22). A tension sensor (25) is connected above the sliding seat (22) via a spring (24).

3. The oil well dynamic fluid level monitoring device according to claim 1, characterized in that: The winch (5) includes a base (26), a reel (28) is mounted on the surface of the base (26), a servo motor (27) is mounted on the side of the reel (28), one end of the cable (6) is fixed on the reel (28), and the other end of the cable (6) is connected to the float (7) through a threaded connection structure.

4. The oil well dynamic fluid level monitoring device according to claim 3, characterized in that: The mounting shell (4) has a guide rod (11) installed inside, and the base (26) is slidably mounted on the outside of the guide rod (11). The inner side of the mounting shell (4) is connected to the base (26) through an electric push rod (12).

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