Drilling fluid microflow overflow monitoring device

Abstract

The application discloses a drilling fluid micro-flow overflow monitoring device, which comprises a buffer tank, an overhead pipe, a device main body, a fluid detector and a measuring conduit; one end of the device main body is connected with the buffer tank, the other end is connected with the overhead pipe, and a through hole is arranged in the middle part; the bottom of the overhead pipe is connected with the buffer tank through a pipeline; the measuring conduit is fixedly installed in the device main body and is coaxially arranged with the device main body; the fluid detector is fixedly installed at the through hole in the middle part of the device main body and is communicated with the measuring conduit. The application adopts a drainage mode, introduces micro-flow drilling fluid into the measuring conduit, measures the flow through a radar wave, identifies whether overflow through a logic program, thereby solving the problems that the traditional ultrasonic wave and target type flow sensor cannot effectively detect under the conditions of empty well, drilling or small displacement, overflow is aggravated and the like, and simultaneously utilizing an automatic cleaning function, realizing continuous and stable work of the device and improving the overflow monitoring capacity.

Description

Technical Field

[0001] This invention belongs to the field of drilling fluid measurement technology, and specifically relates to a drilling fluid micro-flow overflow monitoring device. Background Technology

[0002] In oil drilling and development, overflow is a common well control accident. If it is not detected and effectively handled in time, it can lead to a blowout or a catastrophic blowout. To avoid such accidents, the most effective method is to detect and handle overflows promptly. Currently, overflow monitoring typically uses ultrasonic sensors or target flow sensors to monitor changes in outlet flow rate. This method is suitable for overflows during circulation or when the overflow volume is large. However, it cannot be effectively monitored during open wells, tripping, or low-flow circulation. This results in overflows worsening before effective monitoring, missing the golden time for overflow handling and escalating the well control accident. There are three reasons for this monitoring lag: First, target flow sensors rely on drilling fluid thrust to function properly. Firstly, a certain gap must be left between the shift lever and the bottom of the overhead pipe. When the flow rate is low, it cannot be pushed or flow through the gap, leading to measurement failure. Secondly, the ultrasonic sensor is installed on the buffer tank, which contains a certain amount of sediment. Under the impact of drilling fluid, the sediment will form an irregular U-shaped surface that is high on both sides and low in the middle. Ultrasonic waves measure the average height of the surface through sound waves. The sensor can only detect when the drilling fluid reaches a certain height. When the drilling fluid flow rate is low, it becomes a monitoring blind zone. Thirdly, according to the grouting requirements, when the well is empty or the drilling is pulled out, the outflowing drilling fluid does not enter the buffer tank but directly enters the metering tank. At this time, a small amount of overflow occurs, which the outlet sensor cannot detect. A small amount of drilling fluid increases in the metering tank, which cannot be accurately identified, creating a monitoring blind zone. Summary of the Invention

[0003] To address the aforementioned problems, this invention discloses a drilling fluid micro-flow overflow monitoring device, comprising: a buffer tank, an overhead pipe, a device body, a fluid detector, and a measuring conduit;

[0004] The main body of the device is connected to a buffer tank at one end and to an overhead pipe at the other end, and has a through hole in the middle.

[0005] The bottom of the elevated pipe is connected to the buffer tank via a pipeline;

[0006] The measuring conduit is fixedly installed inside the main body of the device and is coaxially arranged with the main body of the device;

[0007] The fluid detector is fixedly installed at the through hole in the middle of the main body of the device and is connected to the measuring conduit.

[0008] Furthermore, the main body of the device is tubular.

[0009] Furthermore, the angle between the main body of the device and the horizontal plane ranges from 15° to 30°.

[0010] Furthermore, it also includes: a sampler, a pre-operated electric valve, and a pre-operated manual valve wrench;

[0011] The sampler is horn-shaped, with one end connected to the bottom of the overhead pipe and the other end connected to one end of the pre-installed electric valve;

[0012] The other end of the pre-mounted electric valve is connected to the main body of the device via a pipeline;

[0013] The front-mounted electric valve is equipped with a front-mounted manual valve wrench.

[0014] Furthermore, it also includes: a clean water solenoid valve and a clean water inlet;

[0015] The clean water interface is connected to one end of the clean water solenoid valve via a pipeline;

[0016] The other end of the water solenoid valve is connected to the pre-powered electric valve via a pipeline.

[0017] Furthermore, it also includes: a rear-mounted electric valve, a rear-mounted manual valve wrench, and a drilling fluid outlet pipe;

[0018] One end of the rear-mounted electric valve is connected to the main body of the device via a pipeline, and the other end is connected to the buffer tank via the drilling fluid outlet pipe;

[0019] The rear-mounted electric valve is equipped with a rear-mounted manual valve wrench.

[0020] Furthermore, the fluid detector includes an integrated control circuit, a guide rail, a radar generator and receiver, and a protective sealed float;

[0021] The integrated control circuit is connected to the radar generator receiver;

[0022] The radar receiver is fixedly installed at the bottom of the fluid detector;

[0023] The guide rail is fixedly installed on the side wall of the through hole of the main body of the device;

[0024] The protective sealing float is slidably mounted on the guide rail.

[0025] Furthermore, the angle between the guide rail and the horizontal plane ranges from 30° to 60°.

[0026] Furthermore, the fluid detector also includes: an audible and visual alarm expansion port;

[0027] The expansion port of the audible and visual alarm is connected to the integrated control circuit.

[0028] Furthermore, the main body of the device includes an anti-interference layer;

[0029] The anti-interference layer is disposed around the periphery of the measuring conduit.

[0030] Compared with the prior art, the embodiments of the present invention have at least the following advantages: The present invention adopts a diversion method to introduce micro-flow drilling fluid into the measuring conduit, and then uses radar waves to measure the flow rate and logic programs to identify whether overflow has occurred. This solves the problem that traditional ultrasonic and target flow sensors cannot effectively detect overflows in open wells, drilling runs, or low-displacement conditions, which leads to aggravated overflows. At the same time, the automatic cleaning function is used to clean the drilling fluid and deposits inside the device, thereby enabling the device to work continuously and stably. This not only improves the overflow monitoring capability, but also reduces the labor intensity of personnel and the well control safety risks, improves the overflow monitoring equipment, and provides technical support for efficient and fast drilling.

[0031] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention can be realized and obtained by means of the structures pointed out in the description and the drawings. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 A schematic diagram of the structure of a drilling fluid micro-flow overflow monitoring device according to an embodiment of the present invention is shown;

[0034] Figure 2 A schematic diagram of the interior of the device body according to an embodiment of the present invention is shown;

[0035] Figure 3 A schematic diagram of a full measuring catheter according to an embodiment of the present invention is shown;

[0036] Figure 4 A flowchart of a drilling fluid micro-flow overflow monitoring method according to an embodiment of the present invention is shown;

[0037] Figure 5 A flowchart of overflow monitoring according to an embodiment of the present invention is shown;

[0038] Figure 6 An automated cleaning process flow chart according to an embodiment of the present invention is shown.

[0039] Reference numerals: 1. Buffer tank; 2. Elevated pipe; 3. Main body of the device; 4. Fluid detector; 5. Expansion port for audible and visual alarm; 6. Sampler; 7. Clean water interface; 8. Pre-installed electric valve; 9. Pre-installed manual valve wrench; 10. Rear-installed electric valve; 11. Rear-installed manual valve wrench; 12. Drilling fluid outlet pipe; 13. Anti-interference layer; 14. Radar generator and receiver; 15. Measuring conduit; 16. Protective sealing float. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Through technological breakthroughs, a drilling fluid micro-flow overflow monitoring device was designed and installed at the bottom of the overhead pipe 2. By utilizing diversion, micro-flow monitoring technology and automatic control technology, an independent micro-flow monitoring device was established to achieve accurate monitoring of micro-flow overflow, improve overflow monitoring capabilities, enhance well control safety, and provide technical support for efficient drilling.

[0042] Figure 1 A schematic diagram of a drilling fluid micro-flow overflow monitoring device according to an embodiment of the present invention is shown. Figure 1 As shown, the drilling fluid micro-flow overflow monitoring device proposed in this invention includes: a buffer tank 1, an overhead pipe 2, a device body 3, a fluid detector 4, and a measuring conduit 15;

[0043] The left end of the main body 3 of the device is connected to the bottom of the buffer tank 1 through a pipeline, and the right end is connected to the bottom of the overhead pipe 2 through a pipeline. A through hole is provided on the outer wall in the middle.

[0044] The bottom of the elevated pipe 2 is connected to the buffer tank 1 via a pipeline;

[0045] The measuring conduit 15 is fixedly installed inside the device body 3 and is coaxially arranged with the device body 3;

[0046] The fluid detector 4 is fixedly installed at the through hole in the middle of the main body 3 of the device and is connected to the measuring conduit 15.

[0047] Buffer tank 1, a standard drilling equipment, is used to return high-speed flowing drilling fluid from the wellbore. After buffer tank 1, it is used for logging to measure gas and drilling fluid parameters and for drilling to perform solids control on the drilling fluid.

[0048] Elevated pipe 2 is used to output drilling fluid returned from the wellbore to buffer tank 1;

[0049] Device body 3 is used for overflow monitoring under low flow conditions;

[0050] Fluid detector 4 is used to detect excessive drilling fluid flow inside measuring conduit 15;

[0051] The measuring conduit 15 is used to hold the drilling fluid being tested, allowing the drilling fluid to pass continuously and stably through a fixed container.

[0052] This invention employs a diversion method to introduce a small flow rate of drilling fluid into the measuring conduit 15. The flow rate is measured by radar waves, and a logic program identifies whether an overflow has occurred. This solves the problems that traditional ultrasonic and target-type flow sensors cannot effectively detect overflows in open well, drilling, or low-displacement conditions, leading to aggravated overflows and large errors and low accuracy in the proportion of outlet drilling fluid flow rate, which prevent timely and effective detection of overflows. This invention improves overflow monitoring equipment and provides technical support for efficient and fast drilling.

[0053] Furthermore, the main body 3 of the device is tubular and is fixedly installed in front of the buffer tank 1.

[0054] Furthermore, the angle between the main body 3 of the device and the horizontal plane is in the range of 15-30°.

[0055] Preferably, the main body 3 of the aforementioned device is installed at a 17° angle between the buffer tank 1 and the overhead pipe 2. The drilling fluid naturally enters the measuring conduit 15 through the sampler 6 and then flows into the buffer tank 1 through the outlet. Based on the optimal drilling fluid flow rate and characteristics measured by the fluid detector 4, setting this angle to 17° yields the best results.

[0056] Furthermore, the drilling fluid micro-flow overflow monitoring device also includes: a sampler 6, a pre-mounted electric valve 8, and a pre-mounted manual valve wrench 9;

[0057] The sampler 6 is trumpet-shaped, with a large top and a small bottom. The top of the sampler 6 is connected to the bottom of the overhead pipe 2, and the bottom is fixedly connected to one end of the pre-installed electric valve 8. A filter screen is fixedly installed inside the top of the sampler 6.

[0058] The other end of the pre-mounted electric valve 8 is connected to the measuring conduit 15 of the main body 3 of the device via a pipeline;

[0059] A front-mounted manual valve wrench 9 is installed on the top of the front-mounted electric valve 8.

[0060] Sampler 6 is used to continuously and stably sample drilling fluid from overhead pipe 2 into measuring conduit 15 inside the main body of the device 3;

[0061] The pre-mounted electric valve 8 is used to control the direction of clean water flow during automatic cleaning, control the entry of drilling fluid into the measuring guide tube 15, or prevent drilling fluid from flowing out of the sampler 6 during maintenance.

[0062] The front manual valve wrench 9 is used to effectively control or maintain the front electric valve 8 after it fails.

[0063] Furthermore, the drilling fluid micro-flow overflow monitoring device also includes: a clean water solenoid valve and a clean water interface 7;

[0064] The clean water interface 7 is connected to the right end of the clean water solenoid valve via a pipeline;

[0065] The left end of the water solenoid valve is connected to the pre-mounted electric valve 8 via a pipeline.

[0066] The clean water solenoid valve is used to control the opening or closing of the clean water inlet 7;

[0067] Water inlet 7 is used to connect clean water and supply clean water for automatic cleaning.

[0068] The automatic cleaning function cleans the drilling fluid and deposits inside the device, enabling continuous and stable operation of the device. This not only improves overflow monitoring capabilities but also reduces the labor intensity of personnel and well control safety risks.

[0069] Furthermore, the drilling fluid micro-flow overflow monitoring device also includes: a rear-mounted electric valve 10, a rear-mounted manual valve wrench 11, and a drilling fluid outlet pipe 12;

[0070] One end of the rear-mounted electric valve 10 is connected to the measuring conduit 15 of the main body 3 via a pipeline, and the other end is connected to the buffer tank 1 via the drilling fluid outlet pipe 12.

[0071] A rear-mounted manual valve wrench 11 is installed on the top of the rear-mounted electric valve 10.

[0072] The rear-mounted electric valve 10 is used to control the direction of clean water flow during automatic cleaning, control the flow of drilling fluid into the buffer tank 1, or prevent drilling fluid from flowing back from the buffer tank 1 during maintenance.

[0073] The rear manual valve wrench 11 is used to effectively control or maintain the rear electric valve 10 after it fails.

[0074] The drilling fluid outlet pipe 12 is used to discharge the tested drilling fluid from inside the main body 3 to the buffer tank 1.

[0075] Furthermore, the fluid detector 4 includes an integrated control circuit, a guide rail, a radar generator receiver 14, and a protective sealing float 16;

[0076] The fluid detector 4 has an integrated control circuit inside; the integrated control circuit includes radar wave control processing, full pipe and non-full pipe discrimination, electric valve logic control, solenoid valve control and cleaning logic control.

[0077] The integrated control circuit is connected to the radar generator receiver 14;

[0078] The radar receiver 14 is fixedly installed at the bottom of the fluid detector 4. The radar receiver 14 and the measuring conduit 15 are installed at a right angle and are connected to each other.

[0079] The guide rail is fixedly installed on the side wall of the through hole of the main body of the device (not shown in the figure);

[0080] The protective sealing float 16 is slidably mounted on the guide rail and is located to the left of the radar receiver 14.

[0081] Integrated control circuitry is used for radar wave control and processing, full-tube and non-full-tube discrimination, electric valve logic control, solenoid valve control, and cleaning logic control.

[0082] Guide rails are used to provide directional sliding tracks for the protective sealing float 16;

[0083] Radar receiver 14 is used to detect the excessive flow of drilling fluid inside measuring conduit 15;

[0084] The protective sealing float 16 is used to prevent drilling fluid from entering the radar receiver 14 when the measuring conduit 15 is full, thus preventing damage to the radar receiver 14.

[0085] Furthermore, the angle between the guide rail and the horizontal plane is in the range of 30-60°, which helps to protect the sealing float 16 from sliding upward under the action of buoyancy. When the drilling fluid fills the measuring conduit 15, it seals the through hole on the main body 3 of the device to prevent the drilling fluid from continuing to rise and protect the probe of the radar receiver 14. Preferably, the angle between the guide rail and the horizontal plane is in the range of 45°.

[0086] like Figure 2 As shown, the fluid detector 4 further includes: an audible and visual alarm expansion port 5;

[0087] The expansion port 5 of the audible and visual alarm is connected to the integrated control circuit.

[0088] Expansion port 5 for connecting an audible and visual alarm.

[0089] Furthermore, the main body 3 of the device includes an anti-interference layer 13;

[0090] The anti-interference layer 13 is disposed around the measuring conduit 15.

[0091] The anti-interference layer 13 is used to isolate internal and external temperatures to ensure the accuracy of measurement data; protect the measuring conduit 15; and shield the radar waves from external interference sources such as magnetic fields.

[0092] Figure 4 A flowchart of a drilling fluid micro-flow overflow monitoring method according to an embodiment of the present invention is shown. Figure 4 As shown in the figure, this embodiment proposes a method for monitoring drilling fluid micro-flow overflow, including the following steps:

[0093] This method consists of two steps;

[0094] Step 1: Methods for monitoring micro-flow and high-flow rates;

[0095] ① Under normal power supply conditions, the pre-powered electric valve 8 and the post-powered electric valve 10 open automatically, and the clean water solenoid valve closes.

[0096] ② When the drilling fluid has a small flow rate, the drilling fluid flows directly into the sampler 6 through the overhead pipe 2, enters the measuring conduit 15 through the pre-installed electric valve 8, and then flows out to the buffer tank 1 through the measuring conduit 15.

[0097] ③ When drilling fluid flows through the measuring guide tube 15, the radar wave changes with the amount of drilling fluid flowing through the measuring guide tube 15. The integrated control circuit calculates and determines that drilling fluid is flowing through.

[0098] ④ When the flow rate is low, the drilling fluid does not fill the measuring guide tube 15. The protective sealing float 16 naturally slides down to the lowest point under the action of gravity, and the radar wave comes into direct contact with the drilling fluid.

[0099] ⑤ During high-flow circulation, some drilling fluid flows into the sampler 6. At this time, the measuring guide tube 15 will be full of drilling fluid. To protect the radar probe from damage, the protective sealing float 16 will rise under buoyancy, blocking the radar waves through the seal (e.g., Figure 3 (As shown), to prevent the drilling fluid from continuing to rise.

[0100] Figure 5 A flowchart illustrating overflow monitoring according to an embodiment of the present invention is shown. Figure 5 As shown, the second step is the micro-flow overflow identification method.

[0101] ① After the micro-flow monitoring is completed in the first step, the overflow is identified by the logic program in the integrated control circuit.

[0102] ② Identify the conditions for micro-flow overflow as an empty well (including a state where the pump is not in operation for circulation), or when drilling begins, or at a low flow rate.

[0103] ③ Overflow identification in an empty well: At this time, no circulation or grouting is being carried out, and in principle, no drilling fluid is flowing out. When drilling fluid is detected flowing through, it is judged as an overflow. When the amount of drilling fluid flowing through increases, it is judged as an increase in overflow volume. When the pipe is full, it is judged as an aggravation of overflow.

[0104] ④ Overflow identification during tripping: At this time, no circulation or grouting is being carried out, and in principle, no drilling fluid is flowing out. When drilling fluid is detected flowing through, it is judged as an overflow. When the amount of drilling fluid flowing through increases, it is judged as an increase in overflow volume. When the pipe is full, it is judged as an aggravated overflow.

[0105] ⑤ Overflow identification during small-displacement circulation: The drilling fluid has a fixed flow rate through the measuring pipe 15. When the flow rate increases, it is determined to be an overflow.

[0106] Figure 6 An automated cleaning process flow chart according to an embodiment of the present invention is shown. Figure 6 As shown, the present invention also discloses an automatic cleaning method for a drilling fluid micro-flow overflow detection device, comprising the following steps:

[0107] ① Automatic cleaning is initiated under the following conditions: one is after each large-flow cycle; the other is after a certain period of time when drilling fluid has been flowing through for a long time (including micro-flow).

[0108] ②When the high-flow circulation stops, in order to prevent mud cake from forming at the contact points of the drilling fluid inside the device, the logic program starts cleaning;

[0109] a. Close the pre-electric valve 8 and the post-electric valve 10 to keep the clean water interface 7 connected to the sampler 6.

[0110] b. Open the clean water solenoid valve, and clean water enters the sampler 6. Rinse continuously for 15 seconds. After the clean water volume is greater than that of the sampler 6, it will automatically enter the buffer tank 1.

[0111] After the sampler 6 is cleaned, the pre-electric valve 8 is opened, and clean water enters the measuring conduit 15. After the measuring conduit 15 is filled with clean water, the protective sealing float 16 moves up and seals the radar probe, thus cleaning the connection part of the protective sealing float 16.

[0112] When the pipe is full of clean water, the rear electric valve 10 opens, the clean water solenoid valve closes, the clean water flows out of the device completely, the rear electric valve 10 closes, and the protective sealing float 16 is cleaned again. This action is repeated three times.

[0113] After completing the above steps, open the rear electric valve 10 and flush continuously for 30 seconds to keep the inside of the main body 3 of the device completely clean. At this time, close the clean water solenoid valve to complete the cleaning.

[0114] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A drilling fluid micro-flow overflow monitoring device, characterized in that, include: Buffer tank (1), overhead pipe (2), main body of device (3), fluid detector (4) and measuring conduit (15); The main body (3) of the device is connected to the buffer tank (1) at one end and to the overhead pipe (2) at the other end, and has a through hole in the middle. The bottom of the overhead pipe (2) is connected to the buffer tank (1) via a pipeline; The measuring conduit (15) is fixedly installed inside the device body (3) and is coaxially arranged with the device body (3); The fluid detector (4) is fixedly installed at the through hole in the middle of the main body (3) of the device and is connected to the measuring conduit (15); The main body (3) of the device is tubular; The angle between the main body (3) of the device and the horizontal plane is in the range of 15-30°; It also includes: a sampler (6), a pre-mounted electric valve (8), and a pre-mounted manual valve wrench (9); The sampler (6) is horn-shaped, with one end connected to the bottom of the overhead pipe (2) and the other end connected to one end of the pre-installed electric valve (8); The other end of the pre-installed electric valve (8) is connected to the main body of the device (3) through a pipeline; The front-mounted electric valve (8) is equipped with a front-mounted manual valve wrench (9). The fluid detector (4) includes an integrated control circuit, a guide rail, a radar generator receiver (14), and a protective sealing float (16). The integrated control circuit and the radar generator receiver (14) are connected; The radar receiver (14) is fixedly installed at the bottom of the fluid detector (4); The guide rail is fixedly installed on the side wall of the through hole of the main body (3) of the device; The protective sealing float (16) is slidably mounted on the guide rail; The angle between the guide rail and the horizontal plane ranges from 30° to 60°.

2. The drilling fluid micro-flow overflow monitoring device according to claim 1, characterized in that, Also includes: Clean water solenoid valve and clean water interface (7); The clean water interface (7) is connected to one end of the clean water solenoid valve via a pipeline; The other end of the water solenoid valve is connected to the pre-powered electric valve (8) via a pipeline.

3. The drilling fluid micro-flow overflow monitoring device according to claim 1, characterized in that, Also includes: Rear-mounted electric valve (10), rear-mounted manual valve wrench (11), and drilling fluid outlet pipe (12); One end of the rear-mounted electric valve (10) is connected to the main body of the device (3) through a pipeline, and the other end is connected to the buffer tank (1) through the drilling fluid outlet pipe (12); The rear-mounted electric valve (10) is equipped with a rear-mounted manual valve wrench (11).

4. The drilling fluid micro-flow overflow monitoring device according to claim 1, characterized in that, The fluid detector (4) also includes: an audible and visual alarm expansion port (5); The expansion port (5) of the sound and light alarm is connected to the integrated control circuit.

5. The drilling fluid micro-flow overflow monitoring device according to claim 1, characterized in that, The main body of the device (3) includes an anti-interference layer (13); The anti-interference layer (13) is disposed around the measuring conduit (15).

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