An online measurement system and method for the outlet flow rate of non-full bore drilling fluid

Abstract

The present invention belongs to the field of drilling technology, and specifically relates to an on-line measurement system and method for the outlet flow rate of non-full pipe drilling fluid, including: an outer protective shell, a radar level gauge, a radar wave flow velocity sensor, and an industrial camera. The outer protective shell is hollow and open at the lower part. The outer protective shell is used to be installed on the outer wall of the pipeline, and a detection port matching the lower opening of the outer protective shell is set on the outer wall of the pipeline. The radar level gauge, the radar wave flow velocity sensor, and the industrial camera face the detection port. The acquisition end of the radar level gauge is perpendicular to the outer wall of the pipeline, and an included angle is formed between the radar wave flow velocity sensor and the axis of the pipeline. This solution is based on the cooperation of multiple sensors, with improved measurement accuracy, a relatively wide applicable range of working temperatures, usually meeting -40°C to +120°C, short response time, quick response, and can be applicable to pipelines of various pipe diameters by setting the shape and size of the outer protective shell, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling, and particularly to an on-line measurement system and method for the flow rate of non-full pipe drilling fluid at the outlet. Background Technique

[0002] Gas invasion and leakage of drilling fluid are common complex situations during the drilling process. If not properly handled, they may develop into overflow or even blowout, causing serious consequences. Some blowout and oil leakage accidents on drilling platforms are mainly major safety accidents caused by the lag in gas invasion detection and out-of-control handling, bringing huge losses to personnel lives, property, and the environment. Therefore, in order to effectively prevent the occurrence of similar accidents, it is necessary to conduct in-depth research and strict monitoring on gas invasion and leakage of drilling fluid to ensure that it can be detected in a timely manner at the initial stage of the accident and effective measures can be taken to control it.

[0003] With the increase of complex geological environments and high-difficulty drilling operations such as deep-earth drilling and deep-water drilling, the risks of gas invasion and leakage have increased significantly. In deep-earth drilling, the formation pressure and temperature conditions are more complex, and the gas in the formation is more likely to enter the wellbore; while in deep-water drilling, due to the large depth of seawater, the wellbore pressure system is more complex, and the monitoring and handling difficulties after gas invasion also increase accordingly. This makes the monitoring and prevention of gas invasion and leakage of drilling fluid a key link in ensuring drilling safety.

[0004] Gas invasion and leakage of drilling fluid may cause harmful substances in the drilling fluid to enter the underground water body, resulting in groundwater pollution. For example, substances such as chemical additives and oils in the drilling fluid seep into the underground aquifer, which will change the quality of groundwater and affect the domestic water use and ecological environment of surrounding residents. Especially in some areas with complex geological conditions and imperfect aquitards, this pollution risk is more prominent.

[0005] The leaked drilling fluid may also pollute the soil, change the physical and chemical properties of the soil, and affect the growth of vegetation. In addition, the gas overflow caused by gas invasion, such as toxic and harmful gases containing hydrogen sulfide, will pollute the atmospheric environment and threaten the physical health of on-site operators and surrounding residents. Therefore, in order to reduce the negative impact of drilling operations on the environment and meet the increasingly strict environmental protection requirements, the monitoring and control of gas invasion and leakage of drilling fluid are particularly important.

[0006] At present, although certain progress has been made in the monitoring technology of gas invasion and leakage, there are still some deficiencies. For example, traditional monitoring methods mainly rely on ground monitoring, with limited monitoring accuracy and real-time performance, and it is difficult to detect early gas invasion underground in a timely and accurate manner. Therefore, an on-line measurement system and method for the flow rate of non-full pipe drilling fluid at the outlet are designed. The purpose of accurately measuring the flow rate of non-full pipe drilling fluid at the outlet is to accurately and timely detect the change in drilling fluid flow rate caused by early well kick and well leakage, and provide an engineering warning basis. Summary of the Invention

[0007] The object of the present invention is to provide an on-line measurement system and method for the outlet flow rate of non-full pipe drilling fluid to solve the problems raised in the above-mentioned background technology.

[0008] To achieve the above object, the present invention provides the following technical solution: An on-line measurement system for the outlet flow rate of non-full pipe drilling fluid, comprising:

[0009] An outer protective shell, a radar level gauge, a radar wave velocity sensor and an industrial camera;

[0010] Wherein, the outer protective shell is hollow and open at the lower part, the outer protective shell is used to be installed on the outer wall of the pipeline, and a detection port matching the lower opening of the outer protective shell is set on the outer wall of the pipeline, and the radar level gauge, the radar wave velocity sensor and the industrial camera face the detection port;

[0011] The acquisition end of the radar level gauge is perpendicular to the outer wall of the pipeline, an included angle is formed between the radar wave velocity sensor and the axis of the pipeline, and the shooting end of the industrial camera is perpendicular to the outer wall of the pipeline;

[0012] Three n-shaped mounting brackets are arranged on the upper side inside the outer protective shell, the radar level gauge, the radar wave velocity sensor and the industrial camera are respectively mounted in the three n-shaped mounting brackets, an installation cross beam is arranged on the top of the outer protective shell, a transverse adjustment groove is opened on the lower surface of the installation cross beam, three sliders are arranged inside the installation cross beam, the upper end of the n-shaped mounting bracket passes through the transverse adjustment groove through an upper fastening bolt and is screwed with the corresponding slider, longitudinal adjustment grooves are opened on the side walls of the three n-shaped mounting brackets, side fastening bolts are inserted into the longitudinal adjustment grooves, brackets, longitudinal moving frames and angle adjustment frames are respectively arranged on the upper parts of the radar level gauge, the industrial camera and the radar wave velocity sensor, and the side fastening bolts on the three n-shaped mounting brackets are respectively screwed with the corresponding brackets, longitudinal moving frames and angle adjustment frames.

[0013] Preferably, the outer protective shell is hollow and open at the front part, and a cover plate is detachably connected to the front opening of the outer protective shell.

[0014] Preferably, a magnetic adsorption block is arranged on the lower side of the front opening of the outer protective shell, and the cover plate is made of iron.

[0015] Preferably, mounting lugs are connected to the upper ends of both sides of the outer protective shell.

[0016] Preferably, an infrared filter is arranged on the lower side of the industrial camera.

[0017] Preferably, rotary support seats are arranged on both sides of the outer protective shell. A screw rod is rotatably connected to the rotary support seat. A clamping frame is threadedly connected to the outer wall of the screw rod. A rotary handle is arranged at the top of the screw rod.

[0018] A measurement method for an online measurement system of the outlet flow rate of non-full pipe drilling fluid. The measurement method of the online measurement system of the outlet flow rate of non-full pipe drilling fluid is based on the online measurement system of the outlet flow rate of non-full pipe drilling fluid. The specific steps of the measurement method are as follows:

[0019] S1: Install a radar level gauge, a radar wave velocity sensor, and an industrial camera at corresponding positions outside the pipeline.

[0020] S2: The radar level gauge is used to measure the liquid level height, the radar wave velocity sensor measures the flow velocity, and the video optical flow method of the industrial camera is used to capture the movement of the fluid surface.

[0021] The radar level gauge is vertically installed on the side wall of the pipeline and uses frequency modulation continuous wave technology to measure the liquid level height and the thickness of the attachments on the pipe wall.

[0022] The radar wave velocity sensor is based on a dual-frequency Doppler radar and is inclinedly installed at the 1 / 4 position of the pipeline to obtain the Doppler frequency spectrum distribution.

[0023] The industrial camera is based on the video optical flow method and captures the fluid surface movement vector field at a sampling rate of 50fps to obtain the flow velocity of the fluid.

[0024] Based on the measured liquid level height and the thickness of the attachments on the pipe wall, the cross-sectional area inside the pipeline can be obtained. Based on the cross-sectional area and the flow velocity, the flow rate of the fluid can be obtained.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] This solution is based on the cooperation of multiple sensors, with improved measurement accuracy, a wide applicable range of working temperatures, usually meeting -40°C to +120°C, short response time, quick response, and can be applicable to pipelines of various pipe diameters by setting the shape and size of the outer protective shell, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of the present invention;

[0028] Figure 2 It is a schematic internal structure diagram of the outer protective shell of the present invention;

[0029] Figure 3 It is a schematic structural diagram of the installation cross beam, n-shaped installation frame, etc. of the present invention;

[0030] Figure 4 It is a schematic structural diagram when the present invention is in use;

[0031] Figure 5 The statistical chart of the data of the present invention;

[0032] Figure 6 The inspection chart of the present invention;

[0033] Figure 7 The structural schematic diagram when the rectifying grid of the present invention is in use;

[0034] Figure 8 The structural schematic diagram of the rectifying grid of the present invention.

[0035] In the figure: 1. Outer protective shell; 2. Cover plate; 4. Installation cross beam; 5. Transverse adjustment groove; 6. Upper fastening bolt; 7. N-shaped mounting bracket; 8. Longitudinal adjustment groove; 9. Bracket; 10. Radar level gauge; 11. Industrial camera; 12. Longitudinal moving frame; 13. Angle adjustment frame; 14. Radar wave flow velocity sensor; 15. Side fastening bolt; 16. Magnetic adsorption block; 17. Rotary support seat; 18. Screw; 19. Rotary handle; 20. Clamping frame; 21. Fluid; 22. Rectifying grid; 23. Mounting frame. Specific embodiments

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0038] Embodiment 1:

[0039] Please refer to Figures 1-8 , the present invention provides a technical solution: a non-full pipe drilling fluid outlet flow rate on-line measurement system, including: an outer protective shell 1, a radar level gauge 10, a radar wave flow velocity sensor 14 and an industrial camera 11;

[0040] Among them, the outer protective shell 1 is hollow and open at the lower part. The outer protective shell 1 is used to be installed on the outer wall of the pipeline, and a detection port matching the lower opening of the outer protective shell 1 is set on the outer wall of the pipeline. The radar level gauge 10, the radar wave flow velocity sensor 14 and the industrial camera 11 face the detection port; the acquisition end of the radar level gauge 10 is perpendicular to the outer wall of the pipeline, the radar wave flow velocity sensor 14 forms an angle with the axis of the pipeline, and the shooting end of the industrial camera 11 is perpendicular to the outer wall of the pipeline.

[0041] Analysis of the above content:

[0042] The radar level gauge 10, the radar wave flow velocity sensor 14 and the industrial camera 11 are used to measure the non-full pipe drilling fluid outlet flow rate online by applying the cross-sectional flow velocity method.

[0043] Three sensors are used for measurement. The radar level gauge 10 is used to measure the liquid level height, the radar wave flow velocity sensor 14 measures the flow velocity, and the video optical flow method of the industrial camera 11 may be used to capture the movement of the fluid surface. The cross-sectional flow velocity method calculates the flow rate by multiplying the average flow velocity of the cross-section by the cross-sectional area. Here is the case of non-full pipe, and the traditional full pipe method is not applicable.

[0044] Adjust the position of the measurement cross-section according to the liquid level to avoid errors caused by the non-full pipeline. The radar wave flow velocity sensor may be installed at different positions, or multiple data points may be integrated through an algorithm. The video optical flow method may be used to verify or calibrate the flow velocity data, especially in the case of vortex or irregular flow.

[0045] As Figure 1 、 4 shown, the radar level gauge 10 is vertically installed on the side wall of the pipeline and uses the frequency modulation continuous wave (FMCW) technology to measure the liquid level height H and the thickness δ of the attachment on the pipe wall;

[0046] Pseudocode of the dynamic cross-section reconstruction algorithm

[0047] def dynamic_cross_section(H,δ,V_distribution):

[0048] pipe_inner_diameter=D - 2*δ D is the nominal pipe diameter

[0049] active_area=calculate_heterogeneous_area(H,pipe_inner_diameter)

[0050] velocity_profile = integrate_radar_data(V_distribution, active_area)

[0051] flow_rate = ∫(velocity_profile·n)dA integrated along the effective cross-section

[0052] return flow_rate * correction_factor(H, pipe_inner_diameter);

[0053] Radar wave velocity sensor 14: Dual-frequency Doppler radar (24GHz / 60GHz), tilted and installed at the 1 / 4 position of the pipeline, to obtain the Doppler spectrum distribution V(x, y, z);

[0054] The dual-frequency Doppler radar obtains the Doppler spectrum distribution V(x, y, z) through the following main steps:

[0055] Radar transmitting and receiving signals: The dual-frequency Doppler radar transmits two continuous wave signals with different frequencies (assumed to be f1 and f2 respectively). These signals propagate in space and encounter targets (such as moving objects, fluids, etc.). The target scatters part of the signal and returns it to the radar's receiving antenna.

[0056] Echo signal processing: The echo signal received by the radar receiving antenna contains information about the target. Due to the movement of the target, the received echo signal will have a Doppler frequency shift relative to the transmitted signal. For the transmitted signal with frequency f1, the frequency of its echo signal becomes f1r, and for the transmitted signal with frequency f2, the frequency of its echo signal becomes f2r.

[0057] Frequency shift calculation: According to the Doppler effect, the frequency shifts Δf1 = f1r - f1 and Δf2 = f2r - f2 are related to the radial velocity vr of the target. By performing spectral analysis on the echo signal (such as using the Fast Fourier Transform FFT), the values of the frequency shifts can be obtained.

[0058] Velocity calculation: Utilizing the characteristics of dual frequencies, some factors related to the distance between the radar and the target can be eliminated, thereby calculating the velocity of the target more accurately. Through known radar parameters (such as transmission frequency, wavelength, etc.) and the measured frequency shifts, the velocity vr of the target in the radar line-of-sight direction can be calculated according to the Doppler formula.

[0059] Spatial distribution measurement: To obtain V(x, y, z), the radar needs to be scanned or a multi-antenna array method is adopted. By transmitting and receiving signals at different angles and positions, the velocity information of the target at different spatial positions (x, y, z) can be measured.

[0060] Data fusion and processing: The velocity data measured at different spatial positions and times are fused and processed to finally obtain the Doppler spectral distribution V(x, y, z). This may involve complex signal processing algorithms and data interpolation methods to construct a continuous velocity distribution model.

[0061] Industrial camera 11 captures the fluid surface motion vector field based on the video optical flow method at a sampling rate of 50 fps.

[0062] In use, optical flow refers to the motion of the brightness pattern of an object in an image between two consecutive frames. The video optical flow method is based on the following assumptions: the brightness of the object remains unchanged in a short period of time, and the motion of the object is smooth. Based on these assumptions, the motion speed of the object can be estimated by calculating the brightness change of pixel points in the image, and then the flow rate of the fluid can be obtained.

[0063] Main steps

[0064] Image acquisition: Use a camera to shoot a video of the fluid motion. To obtain accurate results, it is necessary to ensure that the position of the camera is fixed, and the captured image can clearly show the tracer particles in the fluid or the texture features of the fluid itself.

[0065] Preprocessing: Preprocess the captured video images, including operations such as grayscale conversion, noise reduction, and filtering, to improve the image quality and reduce the impact of noise on subsequent calculations.

[0066] Optical flow calculation: Adopt a suitable optical flow algorithm to calculate the optical flow vector of each pixel point in the image. Common optical flow algorithms include gradient-based algorithms (such as the Lucas-Kanade algorithm), energy-based algorithms (such as the Horn-Schunck algorithm), and feature-based algorithms, etc. These algorithms estimate the optical flow vector by analyzing the brightness change of pixel points in adjacent frame images.

[0067] Flow rate calculation: According to the relationship between the optical flow vector and the actual physical quantity, convert the optical flow vector into the flow rate of the fluid. This usually requires information such as the parameters of the camera, the shooting angle, and the physical properties of the fluid, and is calculated through certain geometric relationships and physical models.

[0068] Result analysis and visualization: Analyze and process the calculated flow rate data, such as statistically averaging the flow rate, plotting the flow rate distribution map, etc. At the same time, the flow rate results can be presented in a visual way, such as using color coding to represent different flow rate magnitudes, so as to more intuitively observe the flow characteristics of the fluid.

[0069] On the basis of the above, a rectifying grid 22 can be installed on the lower side of the outer protective shell 1 through a mounting frame 23, and the fluid 21 is rectified when flowing through the rectifying grid 22.

[0070] Example Two:

[0071] Please refer to Figures 1-8 , a technical solution provided by the present invention based on Example One: The outer protective shell 1 is hollow and open at the front, and a cover plate 2 is detachably connected to the front opening of the outer protective shell 1.

[0072] Analysis of the above content: The upper part of the cover plate 2 is connected to the upper part of the front opening of the outer protective shell 1 through a hinge, so that the cover plate 2 can be opened and closed from the front opening of the outer protective shell 1.

[0073] Example Three:

[0074] Please refer to Figures 1-8 , a technical solution provided by the present invention based on Example Two: A magnetic adsorption block 16 is provided on the lower side of the front opening of the outer protective shell 1, and the cover plate 2 is made of iron.

[0075] Analysis of the above content: The magnetic adsorption block 16 can magnetically adsorb the iron cover plate 2, and after the cover plate 2 is closed, it can magnetically attract the cover plate 2 to prevent the cover plate 2 from opening by itself.

[0076] Example Four:

[0077] Please refer to Figures 1-8 , a technical solution provided by the present invention based on Example Two: Installation lugs are connected to the upper ends of both sides of the outer protective shell 1.

[0078] Analysis of the above content: With the installation of the installation lugs, a lifting rope can be hung on them, so as to lift the entire outer protective shell 1.

[0079] Example Five:

[0080] Please refer to Figures 1-8 , a technical solution provided by the present invention based on Example One: Three n-shaped mounting brackets 7 are provided on the upper side inside the outer protective shell 1, and the radar level gauge 10, the radar wave velocity sensor 14 and the industrial camera 11 are respectively mounted in the three n-shaped mounting brackets 7.

[0081] Analysis of the above content: The radar level gauge 10, the radar wave velocity sensor 14 and the industrial camera 11 are hoisted by the three n-shaped mounting brackets 7, which is convenient for the installation and positioning of the radar level gauge 10, the radar wave velocity sensor 14 and the industrial camera 11.

[0082] Example Six:

[0083] Please refer to Figures 1-8, the present invention provides a technical solution based on Embodiment 5: An installation cross beam 4 is provided at the top of the outer protective shell 1. A transverse adjustment groove 5 is formed on the lower surface of the installation cross beam 4. Three sliders are provided inside the installation cross beam 4. The upper end of the n-shaped installation frame 7 passes through the transverse adjustment groove 5 through the upper fastening bolt 6 and is screwed to the corresponding slider.

[0084] Analysis of the above content: The size of the slider is adapted to the inner wall size of the transverse adjustment groove 5, so that the slider can slide inside the transverse adjustment groove 5. The slider is inserted into the transverse adjustment groove 5 from the end of the transverse adjustment groove 5. A screw hole matching the upper fastening bolt 6 is formed on the slider. In this way, when the n-shaped installation frame 7 needs to be installed, the upper end of the n-shaped installation frame 7 is connected to the screw hole of the slider through the upper fastening bolt 6. At this time, the upper fastening bolt 6 is not tightened, and the n-shaped installation frame 7 and the slider can be moved on the transverse adjustment groove 5. After moving to a suitable position, the upper fastening bolt 6 is tightened with the screw hole of the slider to fix the n-shaped installation frame 7.

[0085] Embodiment 7:

[0086] Please refer to Figures 1-8 , the present invention provides a technical solution based on Embodiment 5: Longitudinal adjustment grooves 8 are formed on the side walls of the three n-shaped installation frames 7. Side fastening bolts 15 are inserted into the longitudinal adjustment grooves 8. Brackets 9, longitudinal moving frames 12 and angle adjustment frames 13 are respectively provided on the upper parts of the radar level gauge 10, industrial camera 11 and radar wave velocity sensor 14. The side fastening bolts 15 on the three n-shaped installation frames 7 are respectively screwed to the corresponding brackets 9, longitudinal moving frames 12 and angle adjustment frames 13.

[0087] Analysis of the above content: Similar to the adjustment method in Embodiment 6, loosen the side fastening bolts 15 so that the brackets 9, longitudinal moving frames 12 and angle adjustment frames 13 can move up and down inside the n-shaped installation frame 7. After moving to a suitable position, tighten the side fastening bolts 15.

[0088] The specific structural forms of the brackets 9, longitudinal moving frames 12 and angle adjustment frames 13 are as Figure 1 , 2 shown.

[0089] Embodiment 8:

[0090] Please refer to Figures 1-8 , the present invention provides a technical solution based on Embodiment 5: An infrared filter is provided on the lower side of the industrial camera 11.

[0091] Embodiment 9:

[0092] Please refer to Figures 1-8, the present invention provides a technical solution based on Embodiment 5: Rotating support seats 17 are provided on both sides of the outer protective shell 1. A screw rod 18 is rotatably connected to the rotating support seat 17. A clamping frame 20 is threadedly connected to the outer wall of the screw rod 18. A rotating handle 19 is provided at the top of the screw rod 18.

[0093] Analysis of the above content: The inspection opening on the pipeline is closed by a sealing plate under normal conditions. When installing the outer protective shell 1 at the inspection opening of the pipeline, the clamping frames 20 on both sides are snapped into the opposite sides of the inspection opening. Then, the rotating handle 19 is rotated. The rotating handle 19 drives the screw rod 18 to rotate. The screw rod 18 makes the clamping frame 20 rise through the cooperation of the threads. Finally, the clamping frame 20 and the outer protective shell 1 are respectively clamped on the upper and lower sides of the edge of the inspection opening, so that structures such as the outer protective shell 1, the radar level gauge 10, the radar wave flow velocity sensor 14, and the industrial camera 11 are integrally fixedly connected to the pipeline inspection opening.

[0094] A measurement method for an online measurement system of the outlet flow rate of non-full pipe drilling fluid. The measurement method of the online measurement system of the outlet flow rate of non-full pipe drilling fluid is based on the online measurement system of the outlet flow rate of non-full pipe drilling fluid. The specific steps of the measurement method are as follows:

[0095] S1: Install the radar level gauge 10, the radar wave flow velocity sensor 14, and the industrial camera 11 at the corresponding positions outside the pipeline.

[0096] S2: The radar level gauge 10 is used to measure the liquid level height. The radar wave flow velocity sensor 14 measures the flow velocity. The video optical flow method of the industrial camera 11 is used to capture the movement of the fluid surface.

[0097] The radar level gauge 10 is vertically installed on the side wall of the pipeline and uses frequency modulation continuous wave technology to measure the liquid level height and the thickness of the attachments on the pipe wall.

[0098] The radar wave flow velocity sensor 14 is based on a dual-frequency Doppler radar and is inclinedly installed at the 1 / 4 position of the pipeline to obtain the Doppler frequency spectrum distribution.

[0099] The industrial camera 11 is based on the video optical flow method and captures the fluid surface movement vector field at a sampling rate of 50fps to obtain the flow velocity of the fluid.

[0100] Based on the measured liquid level height and the thickness of the attachments on the pipe wall, the cross-sectional area inside the pipeline can be obtained. Based on the cross-sectional area and the flow velocity, the flow rate of the fluid can be obtained.

[0101] The following are the relevant data of this solution

[0102] The data statistical chart is as Figure 5 shown;

[0103] The inspection chart is as Figure 6 shown;

[0104] In the inspection diagram, from the perspective of measurement accuracy comparison, the accuracy of the traditional measurement method is only 70%, while the measurement accuracy of the multi-sensor cooperation of the present invention reaches 95%, which is significantly higher than that of the traditional method, demonstrating the advantage of the present invention in measurement accuracy. In terms of the working temperature range, the applicable temperature of the traditional measurement device is between -20°C and +80°C, and the applicable temperature range of the present invention is -40°C to +120°C, with a wider range, indicating that the present invention has stronger adaptability in different temperature environments. In the comparison of response time, the response time of the traditional measurement device is 10s, and the response time of the present invention is only 2s, which is greatly shortened, reflecting that the present invention responds more quickly during measurement. All of these strongly prove the significant improvement of the present invention in technical effects compared with the traditional measurement device.

[0105] The above shows and describes the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the present invention; therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention, and any reference signs in the claims should not be regarded as limiting the claims involved.

[0106] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An online measurement system for the flow rate of non-full bore drilling fluid, characterized in that, Including: An outer protective shell (1), a radar level gauge (10), a radar wave flow velocity sensor (14), and an industrial camera (11); Among them, the outer protective shell (1) is hollow and open at the lower part. The outer protective shell (1) is used to be installed on the outer wall of the pipeline, and a detection port matching the lower opening of the outer protective shell (1) is set on the outer wall of the pipeline. The radar level gauge (10), the radar wave flow velocity sensor (14), and the industrial camera (11) face the detection port; The acquisition end of the radar level gauge (10) is perpendicular to the outer wall of the pipeline. An included angle is formed between the radar wave flow velocity sensor (14) and the axis of the pipeline. The shooting end of the industrial camera (11) is perpendicular to the outer wall of the pipeline; Three n-shaped mounting brackets (7) are arranged on the upper side inside the outer protective shell (1). The radar level gauge (10), the radar wave flow velocity sensor (14), and the industrial camera (11) are respectively mounted in the three n-shaped mounting brackets (7). An installation cross beam (4) is arranged at the top of the outer protective shell (1). A transverse adjustment groove (5) is opened on the lower surface of the installation cross beam (4). Three sliders are arranged inside the installation cross beam (4). The upper end of the n-shaped mounting bracket (7) passes through the transverse adjustment groove (5) through an upper fastening bolt (6) and is screwed with the corresponding slider; Longitudinal adjustment grooves (8) are opened on the side walls of the three n-shaped mounting brackets (7). Side fastening bolts (15) are inserted into the longitudinal adjustment grooves (8). Brackets (9), longitudinal moving brackets (12), and angle adjustment brackets (13) are respectively arranged on the upper parts of the radar level gauge (10), the industrial camera (11), and the radar wave flow velocity sensor (14). The side fastening bolts (15) on the three n-shaped mounting brackets (7) are respectively screwed with the corresponding brackets (9), longitudinal moving brackets (12), and angle adjustment brackets (13).

2. The on-line measurement system for the outlet flow rate of non-full bore drilling fluid according to claim 1, wherein: The outer protective shell (1) is hollow and open at the front part. A cover plate (2) is detachably connected to the front opening of the outer protective shell (1).

3. An on-line measurement system for the outlet flow rate of non-full bore drilling fluid according to claim 2, characterized in that: A magnetic adsorption block (16) is arranged on the lower side of the front opening of the outer protective shell (1). The cover plate (2) is made of iron.

4. The on-line measurement system for the outlet flow rate of non-full bore drilling fluid according to claim 1, characterized in that: Installation lugs are connected to the upper ends of both sides of the outer protective shell (1).

5. An on-line measurement system for the outlet flow rate of non-full bore drilling fluid according to claim 1, characterized in that: An infrared filter is arranged on the lower side of the industrial camera (11).

6. The on-line measurement system for the outlet flow rate of non-full bore drilling fluid according to claim 1, wherein: Rotary support seats (17) are arranged on both sides of the outer protective shell (1). A screw rod (18) is rotatably connected to the rotary support seats (17). A clamping frame (20) is threadedly connected to the outer wall of the screw rod (18). A rotary handle (19) is arranged at the top of the screw rod (18).

7. A measuring method for an on-line measuring system of the outlet flow rate of non-full bore drilling fluid, characterized in that: The measurement method of this non-full pipe drilling fluid outlet flow rate online measurement system is based on the non-full pipe drilling fluid outlet flow rate online measurement system described in any one of claims 1-6. The specific steps of this measurement method are as follows: S1: Install the radar level gauge (10), the radar wave flow velocity sensor (14), and the industrial camera (11) at the corresponding positions outside the pipeline; S2: The radar level gauge (10) is used to measure the liquid level height, the radar wave flow velocity sensor (14) measures the flow velocity, and the video optical flow method of the industrial camera (11) is used to capture the movement of the fluid surface; The radar level gauge (10) is vertically installed on the side wall of the pipeline, and the frequency modulation continuous wave technology is adopted to measure the liquid level height and the thickness of the attachments on the pipe wall; The radar wave flow velocity sensor (14) is based on a dual-frequency Doppler radar and is inclinedly installed at the 1 / 4 position of the pipeline to obtain the Doppler spectrum distribution; The industrial camera (11) is based on the video optical flow method and captures the fluid surface motion vector field at a sampling rate of 50 fps to obtain the flow velocity of the fluid; Based on the measured liquid level height and the thickness of the attachments on the pipe wall, the cross-sectional area inside the pipeline can be obtained. Based on the cross-sectional area and the flow velocity, the flow rate of the fluid can be obtained.

Images