Drill pipe inner wall scraper and scraping method

Abstract

The present invention relates to a scraper for the inner wall of a drill pipe and a scraping method, belonging to the technical field of drilling tool cleaning. The scraper includes a shell, a leather cup is provided on the outer wall of the shell, a plurality of control valves are installed in the shell, a pneumatic vibrator and an air storage chamber are provided below the control valve; a battery pack is provided above the shell, and the battery pack is connected to an air pump. The scraper can scrape the mud on the inner wall of the drill pipe through the leather cup. By using the flexible structure of the leather cup to contact the inner wall of the drill pipe, the scraper can better fit the inner wall of the drill pipe, effectively deal with the diameter change of the inner wall of the drill pipe, and provide a more stable cleaning effect; at the same time, the laser ranging sensor at the bottom of the scraper can detect the liquid level change in real time and issue an alarm when necessary to predict the possible bottom hole overflow. These main technical means are used to solve the problems of the existing scraper blade not being able to better fit the inner wall of the drill pipe and the inability to warn of overflow. At the same time, solutions are reserved for special situations such as self-blocking and failure.

Description

Technical Field

[0001] The invention relates to a drill rod inner wall scraper and a scraping method, belonging to the technical field of drilling tool cleaning. Background Art

[0002] During oil drilling operations, the mixture of drilling fluid and underground muddy water forms slurry that adheres to the drill pipe. During the pull-out process, the mud adhering to the outer and inner walls of the drill pipe is carried out of the drilling platform, resulting in a waste of drilling fluid. Furthermore, the drilling fluid that has fallen on the drilling platform can easily pollute the environment when it overflows. Furthermore, the drilling fluid on the drilling platform freezes into ice in cold weather, making it easy to slip and fall while walking on the drilling platform, affecting production safety. Furthermore, the alkaline nature of the drilling fluid can corrode the drilling platform and mechanical equipment. Furthermore, the adhering drilling fluid can also affect the drilling tool make / breakout operations, making it extremely necessary to remove the mud from the drill pipe.

[0003] The mud attached to the outer wall can be scraped off with a rubber hose wrapped around the drill pipe, but the mud attached to the inner wall is not easy to clean. Steam cleaning and diesel ignition incineration are currently used. However, these methods have problems such as unstable cleaning effect, high energy consumption, and lack of environmental protection, and cannot meet the on-site operation requirements.

[0004] Patent application with announcement number CN106194114A discloses a symmetrical spiral-blade drill pipe inner wall scraper, which includes a core tube, a scraper group and a float bucket. The core tube is a hollow vertical tube, and the scrapers are equidistantly distributed around the core tube to form a scraper group. The scrapers are composed of upper spiral blades and lower spiral blades. The upper spiral blades and the lower spiral blades have opposite spiral directions and are symmetrically distributed up and down. The connection between the upper spiral blades and the lower spiral blades is connected by a rounded transition. The inner edges of the upper spiral blades and the lower spiral blades are respectively connected to the outer wall of the core tube through support arms. The inner and outer edges of the scraper group are concentric circles. The float bucket is a container with a bottom and an upper opening. The upper opening of the float bucket is connected to the lower opening of the core tube by a thread, and the upper opening of the core tube is sealed by a threaded connection. The invention can reduce waste and pollution, reduce pollution treatment costs, and effectively prevent water holes in drilling tools from freezing. The spiral scrapers are easier to pass through the drill pipe joints and are not easy to get stuck.

[0005] The scraper mentioned above can clean the inner wall of the drill pipe, but it uses its own gravitational potential energy as a power source to move downward. It is a passive scraper and cannot cope with special situations such as self-blocking and bottom hole overflow. The inner wall of the drill pipe has many diameter changes. At the diameter change point, traditional scrapers cannot easily handle the problem of self-blocking while ensuring a good fit between the scraper and the inner wall of the drill pipe, and the cleaning effect cannot be guaranteed. At the same time, the scraper cannot warn of possible overflow. With the advancement of intelligence and digitalization, this function should be included in the scraper as a basic function. Therefore, it is necessary to design a scraper and scraping method for the inner wall of the drill pipe to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to address the deficiencies of the existing technology and provide an active scraper that has sufficient power to effectively clean mud, can cope with a variety of special situations through intelligent control, and is not prone to getting stuck. By using a flexible structure such as a leather cup to contact the inner wall of the drill pipe, the scraper can better fit the inner wall of the drill pipe, effectively cope with the diameter change of the inner wall of the drill pipe, and provide a more stable cleaning effect; at the same time, the laser ranging sensor at the bottom of the scraper can detect liquid level changes in real time and issue an alarm when necessary to predict possible bottom hole overflows. These main technical means are used to solve the problems of the existing scraper blades not being able to fit the inner wall of the drill pipe well and not being able to warn of overflows.

[0007] The technical solution of the present invention is:

[0008] A drill pipe inner wall scraper includes a housing, a leather cup, a two-position, three-way solenoid valve A, a two-position, three-way solenoid valve B, a two-position, three-way solenoid valve C, a proportional valve, a pneumatic vibrator, an air storage chamber, a battery pack, an air pump, a Hall effect sensor, a laser rangefinder, and a pressure sensor. The scraper's internal components are sealed within the housing, isolated from the outside world, and protected from explosion, corrosion, and water.

[0009] A pedometer is arranged on the top of the battery pack.

[0010] The pedometer comprises a base, a pedometer wheel bracket and a pedometer wheel. The pedometer wheel bracket is symmetrically mounted on the base via a pin shaft, and the pedometer wheel is movably mounted on the top end of the pedometer wheel bracket.

[0011] The base is provided with a torsion spring capable of applying thrust to the pedometer wheel bracket.

[0012] A sink is provided at the center of the bottom of the base, and the sink is connected to the air pump set.

[0013] An upper air port is provided on the base, and a lower air port is provided at the bottom of the shell. The lower air port is connected to the upper air port through a proportional valve and a connecting pipe to ensure that sufficient and adjustable air flow can pass through the air path, so that the air pressure of the upper air port and the lower air port can be balanced under normal mud scraping working conditions. The lower air port and the upper air port are connected to the air pump, pneumatic vibrator and air storage chamber through a two-position three-way solenoid valve A, a two-position three-way solenoid valve B, a two-position three-way solenoid valve C and a connecting pipe.

[0014] A laser distance sensor and a pressure sensor are installed at the bottom of the scraper. The laser distance sensor can detect the distance between the scraper and the mud surface in real time, and issue an alarm when necessary to predict possible bottom hole overflow. The pressure sensor detects changes in the lower air port pressure.

[0015] A method for scraping mud from the inner wall of a drill pipe, characterized in that it comprises the following steps:

[0016] The method for scraping mud from the inner wall of a drill pipe comprises the following steps:

[0017] Normal scraping:

[0018] S1. Lower the scraper into the drill pipe, open the scraper's leather cup and place it against the inner wall of the drill pipe to scrape the mud;

[0019] S2. Open the proportional valve, place the two-position three-way solenoid valve A in the right position, the two-position three-way solenoid valve B in the right position, and the two-position two-way solenoid valve C in the right position. Connect the upper air port and the lower air port through the proportional valve, air pump, and connecting pipe. By adjusting the opening of the proportional valve, the gas flow in the passage between the lower air port, the proportional valve, and the upper air port is adjusted to control the downward speed of the leather cup;

[0020] S3: During the downward movement of the scraper, when the distance between it and the liquid level in the drill pipe is less than the preset safety distance, braking measures will be triggered, closing the proportional valve, placing the two-position three-way solenoid valve A in the left position, the two-position three-way solenoid valve B in the left position, and the two-position two-way solenoid valve C in the right position, blocking the air flow between the upper and lower air ports and causing it to hover on the inner wall of the drill pipe. When the distance between it and the liquid level in the drill pipe reaches the preset safety distance, the scraper can automatically operate in S1 to resume normal scraping. If necessary, the position displayed by the pedometer can also be used to insert a permanent magnet to release the scraper and remove it from the drill pipe;

[0021] S4: Each time a section of drill pipe is completed, the section count is increased by one, and the distance counted by the pedometer wheel is reset to zero. Each time a single stand (usually three sections of drill pipe) is completed, the section count is also reset to zero, and the scraper will stop on the inner wall of the next section of drill pipe and send a signal that the shackle operation can be carried out. When the single stand above the scraper is removed, press the start button, run S1 for normal scraping, and enter the next cycle. When the scraper stops descending and the pedometer mileage has not reached a single stand, check whether the distance sensor is working properly. If it is normal, it indicates that the liquid level may be higher than the horizontal plane of the coupling. At this time, the shackle operation cannot be carried out to prevent mud leakage;

[0022] S5. During the drilling process, the pressure sensor under the scraper will detect the changes in the air pressure at the lower air port in real time, and adjust the opening of the proportional valve in real time according to the air pressure value at the lower air port to balance the air pressure on the upper and lower sides of the scraper, preventing the lower air port from generating a large negative pressure or the scraper from being pressed into the mud by atmospheric pressure.

[0023] Scraping mud encounters resistance:

[0024] S6. Close the proportional valve, place the two-position three-way solenoid valve A in the right position, the two-position three-way solenoid valve B in the right position, and the two-position two-way solenoid valve C in the right position. Maintain the upper air port and the lower air port in communication through the two-position three-way solenoid valve A, the air pump, and the two-position three-way solenoid valve B. Turn on the air pump to generate negative pressure under the leather cup. The pressure difference and the weight of the scraper push the leather cup downward, increasing the thrust on the leather cup to release the jam. After the jam is released, turn off the air pump, open the proportional valve, and run S1 for normal scraping. If the jam cannot be released through the above operations, go to S7.

[0025] S7. Keep the proportional valve closed, place the two-position three-way solenoid valve A in the right position, the two-position three-way solenoid valve B in the left position, and the two-position two-way solenoid valve C in the right position. Connect the upper air port to the air storage chamber through the two-position three-way solenoid valve A, the air pump, and the two-position three-way solenoid valve B. Turn on the air pump to pressurize the gas in the air storage chamber.

[0026] S8. After the pressurization is completed, the two-position two-way solenoid valve C is placed in the left position, and the air storage chamber is connected to the pneumatic vibrator through the two-position three-way solenoid valve C. The air pump and the gas in the air storage chamber drive the pneumatic vibrator to drive the entire scraper to vibrate, so that the static friction is converted into dynamic friction, thereby achieving the purpose of unblocking;

[0027] S9. Repeat the process of S5 and S7 several times to release the jam by vibration. After the jam is released, run S1 to scrape mud normally.

[0028] Downward speed or emergency:

[0029] S10. Close the proportional valves, place the two-position three-way solenoid valve A in the left position, the two-position three-way solenoid valve B in the left position, and the two-position two-way solenoid valve C in the right position, thereby blocking the air flow between the upper and lower air ports and preventing the scraper from continuing to move downward.

[0030] S11. If an emergency occurs and the scraper loses control and moves downward, the scraper will float on the mud due to the presence of the air storage chamber and will not sink. According to the position displayed by the pedometer, you can put in a permanent magnet and release it to salvage the scraper from the drill pipe (refer to the attached instructions for the above steps). Figure 7-8 ).

[0031] The beneficial effects of the present invention are:

[0032] This drill pipe inner wall scraper uses a leather cup to scrape mud off the inner wall of the drill pipe. The flexible structure of the leather cup allows the scraper to conform well to the inner wall of the drill pipe, effectively addressing changes in the diameter of the drill pipe and providing a more stable cleaning effect. A laser ranging sensor at the bottom of the scraper can also detect liquid level changes in real time and issue an alarm when necessary, predicting possible bottomhole overflows. This solves the problem of existing scrapers not being able to conform well to the inner wall of the drill pipe and providing an inability to warn of overflows. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of the present invention;

[0034] Figure 2 It is a cross-sectional schematic diagram of the present invention;

[0035] Figure 3 It is an exploded schematic diagram of the present invention;

[0036] Figure 4 It is a structural schematic diagram of a pedometer of the present invention;

[0037] Figure 5 yes Figure 1 A magnified schematic diagram of point A in the middle;

[0038] Figure 6 It is a structural schematic diagram of the pedometer wheel of the present invention;

[0039] Figure 7 Schematic diagram of the connection of the gas circuit of the present invention;

[0040] Figure 8 It is the air pressure principle diagram of the present invention.

[0041] In the figure: 1. Shell, 2. Leather cup, 3. Two-position three-way solenoid valve A, 4. Two-position three-way solenoid valve B, 5. Two-position three-way solenoid valve C, 6. Proportional valve, 7. Pneumatic vibrator, 8. Air storage chamber, 9. Battery pack, 10. Air pump, 11. Bracket, 12. Pedometer base, 13. Pedometer wheel bracket, 14. Pedometer wheel, 15. Torsion spring, 16. Upper air port, 17. Lower air port, 18. Magnet, 19. Hall sensor, 20. Laser ranging sensor and pressure sensor, 21. Sensor bracket, 22. Sealing ring, 23. Connecting block. DETAILED DESCRIPTION

[0042] The drill pipe inner wall scraper includes a shell 1, a leather cup 2, a two-position three-way solenoid valve A3, a two-position three-way solenoid valve B4, a two-position three-way solenoid valve C5, a proportional valve 6, a pneumatic vibrator 7, an air storage chamber 8, a battery pack 9 and an air pump 10. The shell 1 is cylindrical, and a leather cup 2 is provided on the circumferential surface of the shell 1, so that the leather cup 2 rests on the inner wall of the drill pipe, so that the leather cup 2 and the inner wall of the drill pipe are sealed. During the downward movement of the leather cup 2, the leather cup 2 squeezes the mud on the inner wall of the drill pipe and moves downward, thereby scraping the mud on the inner wall of the drill pipe through the leather cup 2 during the downward movement of the leather cup 2. Mounted on the inner wall of the housing 1, from top to bottom, via bracket 11, are a two-position, three-way solenoid valve A3, a two-position, three-way solenoid valve B4, a two-position, three-way solenoid valve C5, and a proportional valve 6. Below the proportional valve 6, a pneumatic vibrator 7 is located within the housing 1. An air storage chamber 8 is fixed to the bottom port of the housing 1. A battery pack 9 is located above the housing 1 and is connected to an air pump 10. The battery pack 9 comprises a protective housing and multiple battery cells for energy storage. The energy stored in the battery cells powers the air pump 10, as well as the two-position, three-way solenoid valves A3, B4, C5, and the proportional valve 6. The air pump 10 is used to adjust the air pressure above and below the leather cup 2 by suction and exhaust, so that a pressure difference is formed between the upper and lower parts of the leather cup 2, thereby accelerating or slowing down the downward movement of the leather cup 2 under the action of the pressure difference. For example, the air pump 10 is used to suck air from the lower part of the leather cup 2 and exhaust air from the upper part of the leather cup 2. At this time, the air pressure above the leather cup 2 is greater than the air pressure below the leather cup 2. Under the action of the pressure difference, the leather cup 2 is pushed downward quickly. At the same time, when the downward movement of the leather cup 2 is blocked (the leather cup 2 encounters firmly attached mud), the leather cup 2 is pushed downward quickly. (When the slurry is difficult to scrape off), the downward thrust of the leather cup 2 is increased by combining the pressure difference with its own weight, thereby facilitating the unblocking of the leather cup 2 and continuing to scrape the mud on the inner wall of the drill pipe downward; the air pump 10 is used to suck air from the top of the leather cup 2 and exhaust air from the bottom of the leather cup 2. At this time, the air pressure below the leather cup 2 is greater than the air pressure above the leather cup 2. Under the action of the pressure difference, an upward thrust is formed on the leather cup 2, which is opposite to the direction of gravity, so that it and gravity cancel each other out, thereby reducing the downward thrust of the leather cup 2 and slowing down the downward speed of the leather cup 2. The function of the pneumatic vibrator 7 is that when the air pump 10 drives the pneumatic vibrator 7 to vibrate through the gas delivered, the vibration of the pneumatic vibrator 7 drives the leather cup 2 to vibrate, so that the leather cup 2 continuously impacts the firmly attached mud through vibration, thereby scraping off the firmly attached mud and further ensuring the mud scraping effect. The function of the air storage chamber 8 is to store gas. The gas pumped by the air pump 10 is stored in the air storage chamber 8 to make up for the possible situation that the air pump 10 does not supply enough air to the vibrator in a short period of time. At the same time, when special circumstances occur, the air storage chamber 8 can increase the buoyancy to make the scraper float on the mud to prevent the scraper from sinking into the mud; at the same time, the two-position three-way solenoid valve A3, the two-position three-way solenoid valve B4, the two-position three-way solenoid valve C5 and the proportional valve 6 can control the flow direction of the gas, such as controlling the gas flow to the pneumatic vibrator 7 to drive the pneumatic vibrator 7 to vibrate.

[0043] A pedometer is provided on the top of the battery pack 9 to measure the running distance of the scraper in the drill rod by the pedometer, thereby judging the position of the scraper in the drill rod by the distance the scraper runs in the drill rod and positioning the scraper; at the same time, by measuring the downward distance, the downward speed is calculated, and the downward speed is used to judge whether the leather cup 2 is obstructed during the downward scraping process: when the downward speed of the scraper fluctuates within the preset range, the scraping is normal; when the downward speed of the scraper is less than the preset threshold, the scraping is obstructed; when the downward speed of the scraper is greater than the preset threshold, the scraping is too fast or an emergency occurs.

[0044] The pedometer includes a pedometer base 12, a pedometer wheel bracket 13 and a pedometer wheel 14. The pedometer wheel bracket 13 is symmetrically installed on the pedometer base 12 through a pin shaft, and the pedometer wheel 14 is movably installed on the top end of the pedometer wheel bracket 13. By counting the number of rotations of the pedometer wheel 14 and the downward distance of the pedometer wheel 14, the downward distance of the scraper in the drill pipe can be counted, and the scraper can be positioned. For example, when the scraper encounters firmly attached mud stuck in the drill pipe, the downward distance measured by the pedometer wheel 14 can be used to judge the position where the scraper encounters obstruction in the drill pipe.

[0045] A torsion spring 15 is provided on the pedometer base 12, which can apply thrust to the pedometer wheel bracket 13. The elastic force applied by the torsion spring 15 to the pedometer wheel bracket 13 applies pressure to the pedometer wheel 14, squeezing the pedometer wheel 14 against the inner wall of the drill rod, ensuring that the drill rod can drive the pedometer wheel 14 to rotate through friction when the scraper descends in the drill rod, so that the pedometer wheel 14 can measure the downward distance of the scraper during the downward process.

[0046] Magnets 18 are evenly distributed on the pedometer bracket 13 and pedometer wheel 14 on either side of the torsion spring 15. Hall effect sensors 19 are installed on the pedometer bracket 13 on the side of the pedometer wheel 14 and on the pedometer base 12 on the side of the torsion spring 15, respectively, corresponding to the magnets 18. As the scraper moves downward, it drives the pedometer wheel 14 to rotate within the drill pipe. The Hall effect sensors 19 transmit signals indicating changes in the magnetic field strength of the magnets 18, detected during the rotation of the pedometer wheel 14, to the processor, which then calculates the distance traveled by counting the number of revolutions of the pedometer wheel 14. When the scraper has completed a section of drill rod, a neck will appear at the drill rod connection, causing the pedometer wheel bracket 13 to swing inward. The Hall sensor 19 installed on the pedometer base 12 will capture the change in the magnetic field strength of the magnet 18, indicating that the scraper has completed a section of drill rod. In order to reduce the pedometer error, each time the scraper completes a section of drill rod, it is counted as one section, and the count of the number of rotations of the pedometer wheel 14 will be reset and restarted. In this way, it can be known which section of drill rod the scraper is in and its specific position in the section of drill rod. Whenever three sections of drill rod are completed, the scraper will stay on the inner wall of the next section of drill rod, the counted number of sections will also be reset, and a signal will be issued that the shackle operation can be carried out. After the three sections of drill rod that have been cleaned are unloaded, press the start button to continue the normal scraping operation and enter the next cycle. When the step counter shows that the scraper is at the bottom of the drill pipe and three sections of drill pipe have not been cleaned, it indicates that the liquid level may be higher than the horizontal plane of the coupling. At this time, the buckling operation cannot be performed to prevent mud leakage.

[0047] During its descent, if the distance between the scraper and the liquid level in the drill pipe falls below a preset safe distance, a braking action is triggered, causing it to hover against the inner wall of the drill pipe. When the distance between the scraper and the liquid level reaches the preset safe distance, the scraper automatically operates to resume normal scraping. If necessary, the scraper can be removed from the drill pipe by inserting a permanent magnet based on the position displayed by the pedometer.

[0048] A sink is provided at the bottom center of the pedometer base 12, and the sink is connected to the air pump 10. Its purpose is, on the one hand, to isolate the air pump from the outside through the sink, and then protect the air pump 10 through the pedometer base 12; on the other hand, the air pump 10 is dissipated through the pedometer base 12, and the heat generated in the process of compressing the gas by the air pump 10 is dissipated outward, so as to avoid damage caused by heat accumulation of the air pump 10.

[0049] An upper air port 16 is provided on the pedometer base 12, and a lower air port 17 is provided at the bottom of the housing 1. The lower air port 17 is connected to the upper air port 16 via a proportional valve 6 and a connecting pipe. The lower air port 17 and the upper air port 16 are connected to the air pump 10, the pneumatic vibrator 7, and the air storage chamber 8 via a two-position three-way solenoid valve A3, a two-position three-way solenoid valve B4, a two-position three-way solenoid valve C5, and a connecting pipe. Specifically, the lower air port 17 and the upper air port 16 are connected to the inlet of the air pump 10 via the two-position three-way solenoid valve A3 and the connecting pipe. The outlet of the air pump 10 is connected to the air storage chamber 8 via the two-position three-way solenoid valve B4 and the connecting pipe, and is also connected to the upper air port 16 via the two-position three-way solenoid valve B4 and the connecting pipe. The air storage chamber 8 is connected to the pneumatic vibrator 7 via the two-position three-way solenoid valve C5 and the connecting pipe. The pneumatic vibrator 7 is connected to the proportional valve 6 and the upper air port 16 via the connecting pipe.

[0050] A sensor bracket 21 is installed below the air storage chamber 8, and a laser distance sensor and a pressure sensor 20 are installed on the sensor bracket 21 for detecting the changes in the mud liquid level below the scraper and the air pressure at the lower air port.

[0051] The method for scraping mud from the inner wall of a drill pipe comprises the following steps:

[0052] Normal scraping:

[0053] The scraper is lowered into the drill pipe, with its leather cup 2 extended and resting against the inner wall of the drill pipe. The proportional valve 6 is opened, and the two-position, three-way solenoid valve A3, two-position, three-way solenoid valve B4, and two-position, three-way solenoid valve C5 are adjusted as follows: the lower air port 17, the two-position, three-way solenoid valve A3, the air pump 10, the two-position, three-way solenoid valve B4, and the upper air port 16 are connected in sequence. The passage between the air storage chamber 8 and the gas vibrator 8 is disconnected via the two-position, three-way solenoid valve C5. Gas within the drill pipe below the leather cup 2 is discharged above the leather cup 2 through the passages through the lower air port 17, the proportional valve 6, the upper air port 16, and the lower air port 17, the two-position, three-way solenoid valve A3, the air pump 10, the two-position, three-way solenoid valve B4, and the upper air port 16. This allows the scraper's own weight to push the leather cup 2 downward, scraping mud off the inner wall of the drill pipe. By adjusting the opening of the proportional valve 6, the gas flow in the passage between the lower gas port 17, the proportional valve 6 and the upper gas port 16 is adjusted, thereby controlling the downward speed of the leather cup 2.

[0054] Scraping mud encounters resistance:

[0055] Close proportional valve 6, maintaining connectivity between two-position, three-way solenoid valves A3 and B4. Adjust the sequential connectivity between lower air port 17, two-position, three-way solenoid valve A3, air pump 10, two-position, three-way solenoid valve B4, and upper air port 16. Disconnect the passage between air storage chamber 8 and gas vibrator 8 via two-position, three-way solenoid valve C5. Turn on air pump 10. Its action displaces the gas within the drill pipe below cup 2 upward through the passageway connecting lower air port 17, two-position, three-way solenoid valve A3, air pump 10, two-position, three-way solenoid valve B4, and upper air port 16, creating a negative pressure below cup 2. The pressure differential and the weight of the scraper push cup 2 downward, increasing the thrust on it and thereby unblocking it. After unblocking, turn off air pump 10, open proportional valve 6, and resume normal scraping. If the pressure differential and weight of the scraper fail to unblock it, proceed to the following steps.

[0056] Keeping proportional valve 6 closed, adjust the two-position, three-way solenoid valve A3, two-position, three-way solenoid valve B4, and two-position, three-way solenoid valve C5 as follows: Connect the upper air port 16, two-position, three-way solenoid valve A3, air pump 10, two-position, three-way solenoid valve B4, and air storage chamber 8 in sequence, disconnecting the passage between air storage chamber 8 and gas vibrator 8. Turn on air pump 10 and fill air into air storage chamber 8 through the passageway connecting the upper air port 16, two-position, three-way solenoid valve A3, air pump 10, two-position, three-way solenoid valve B4, and air storage chamber 8, pressurizing the gas in air storage chamber 8. Once pressurized, connect air storage chamber 8 to gas vibrator 8 via two-position, three-way solenoid valve B4. The air pump 10 and the gas pressure in air storage chamber 8 drive pneumatic vibrator 7 to vibrate, which in turn drives leather cup 2 to vibrate. Repeat this process multiple times to release the jam through vibration. After the jam is released, normal mud scraping can resume.

[0057] When descending too fast or in an emergency (e.g. when the scraper fails and cannot stop it from descending):

[0058] Close the proportional valve 6 and make the following adjustments to the two-position three-way solenoid valve A3, the two-position three-way solenoid valve B4, and the two-position three-way solenoid valve C5: block the connection between the two-position three-way solenoid valve A3 and the upper air port, and block the connection between the two-position three-way solenoid valve B4 and the lower air port, thereby disconnecting the passage between the upper air port and the lower air port, thereby preventing the scraper from continuing to descend.

[0059] If a special situation occurs in which the mud scraper cannot be stopped from descending, the mud scraper will float on the mud and will not sink due to the presence of the air storage chamber 8.

[0060] This drill pipe inner wall scraper uses a leather cup to scrape mud off the inner wall of the drill pipe. The flexible structure of the leather cup allows the scraper to conform well to the inner wall of the drill pipe, effectively addressing changes in the diameter of the drill pipe and providing a more stable cleaning effect. A laser ranging sensor at the bottom of the scraper can also detect liquid level changes in real time and issue an alarm when necessary, predicting possible bottomhole overflows. This solves the problem of existing scrapers not being able to conform well to the inner wall of the drill pipe and providing an inability to warn of overflows.

Claims

1. A drill pipe inner wall scraper, comprising a housing (1), a leather cup (2), a two-position three-way solenoid valve A (3), a two-position three-way solenoid valve B (4), a two-position three-way solenoid valve C (5), a proportional valve (6), a pneumatic vibrator (7), an air storage chamber (8), a battery pack (9) and an air pump (10), characterized in that: The shell (1) is cylindrical, and a leather cup (2) is provided on the circumferential surface of the shell (1). A two-position three-way solenoid valve A (3), a two-position three-way solenoid valve B (4), a two-position three-way solenoid valve C (5) and a proportional valve (6) are sequentially installed on the inner wall of the shell (1) through a bracket (11) from top to bottom. A pneumatic vibrator (7) is provided in the shell (1) below the proportional valve (6). An air storage chamber (8) is fixedly installed on the bottom port of the shell (1). A sensor bracket (21) is provided at the lower part of the air storage chamber (8). The sensor bracket (21) is provided with a laser distance sensor and a pressure sensor (20); a battery pack (9) is provided above the shell (1), and the battery pack (9) is connected to an air pump (10); A pedometer is provided on the top of the battery pack (9); The pedometer comprises a pedometer base (12), a pedometer wheel bracket (13) and a pedometer wheel (14); The pedometer base (12) is provided with an upper air port (16), and the bottom of the housing (1) is provided with a lower air port (17). The lower air port (17) is connected to the upper air port (16) through a proportional valve (6) and a connecting pipe. The lower air port (17) and the upper air port (16) are connected to the inlet of the air pump (10) through a two-position three-way solenoid valve A (3) and a connecting pipe; the outlet of the air pump (10) is connected to the air storage chamber (8) through a two-position three-way solenoid valve B (4) and a connecting pipe and is connected to the upper air port (16) through a two-position three-way solenoid valve B (4) and a connecting pipe; the air storage chamber (8) is connected to the pneumatic vibrator (7) through a two-position three-way solenoid valve C (5) and a connecting pipe, and the pneumatic vibrator (7) is respectively connected to the proportional valve (6) and the upper air port (16) through a connecting pipe.

2. The drill pipe inner wall scraper according to claim 1, characterized in that: A pedometer wheel bracket (13) is symmetrically mounted on the pedometer base (12) via a pin shaft, and a pedometer wheel (14) is movably mounted on the top end of the pedometer wheel bracket (13).

3. The drill pipe inner wall scraper according to claim 2, characterized in that: The pedometer base (12) is provided with a torsion spring (15) capable of applying a thrust to the pedometer wheel bracket (13).

4. The drill pipe inner wall scraper according to claim 2, characterized in that: A sink is provided at the center of the bottom of the pedometer base (12), and the sink is connected to the air pump (10) in a sleeve.

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