High-temperature-resistant lost circulation material while drilling, and preparation method and use process thereof

Abstract

The application belongs to the technical field of lost circulation material, and particularly relates to a high-temperature-resistant lost circulation material while drilling and a preparation method and use process thereof. The high-temperature-resistant lost circulation material while drilling is composed of the following raw materials in parts by weight: 10-20 parts of ceramic fiber, 10-20 parts of modified resin fiber, 25-35 parts of sepiolite, 5-8 parts of regenerated carbon fiber, 10-20 parts of elastic graphite, 25-35 parts of superfine calcium carbonate and 20-30 parts of marble sand. The high-temperature-resistant lost circulation material while drilling is made of the above materials, the temperature resistance of the lost circulation material while drilling reaches 220 DEG C, the sealing filtration loss is less than 20 mL when the addition amount is 4%, the lost circulation material while drilling is suitable for water-based and oil-based drilling fluids, and the problems of single component, poor fiber toughness and low temperature resistance are effectively improved. The lost circulation material while drilling can solve the problems of leakage prevention and plugging of pores, natural microfractures and induced fractures, and is especially suitable for solving the problem of narrow safety density window of high-temperature, high-density and high-pressure "three-high" wells.

Description

Technical Field

[0001] This invention belongs to the field of plugging agent technology, specifically a high-temperature resistant drilling plugging agent and its preparation method and application process. Background Technology

[0002] Drilling is the process of creating boreholes in the ground using mechanical equipment or manpower. It typically refers to the drilling of wells for exploring or developing liquid and gaseous minerals such as oil and natural gas, as well as large-diameter water supply wells. Drilling has extremely wide applications in national economic development. Well leakage is a major problem hindering efficient drilling. In cases of well leakage, plugging agents are used to prevent and mitigate the leakage during drilling.

[0003] However, the above technologies often have the following drawbacks: the plugging agents used in the market at present mainly include one-way pressure sealants, walnut shell powder, and ultrafine calcium carbonate, which have problems such as single composition, poor fiber toughness, and low temperature resistance. Moreover, as the drilling depth increases, the temperature inside the well will also increase, which will make the requirements for plugging agents more stringent, especially the high temperature resistance of plugging agents, which is a great test.

[0004] Therefore, this invention provides a high-temperature resistant plugging agent for drilling, its preparation method, and its application process. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0006] The technical solution adopted by this invention to solve its technical problem is: a high-temperature resistant drilling plugging agent, which is composed of the following raw materials in parts by weight:

[0007] 10-20 parts ceramic fiber;

[0008] 10-20 parts of modified resin fiber;

[0009] 25-35 parts of meerschaum;

[0010] 5-8 parts recycled carbon fiber;

[0011] 10-20 parts of elastic graphite;

[0012] 25-35 parts of ultrafine calcium carbonate;

[0013] Marble sand, 20-30 parts.

[0014] The high-temperature resistant plugging agent in this invention has the following effects:

[0015] The high-temperature resistant plugging agent made by using the above materials has a temperature resistance of up to 220 degrees Celsius. When the dosage is 4%, the filtration loss is less than 20 mL. It is suitable for both water-based and oil-based drilling fluids. It effectively improves the problems of single composition, poor fiber toughness, and low temperature resistance. It can solve the problems of leakage prevention and plugging of pores, natural micro-fractures, and induced fractures, especially the problem of narrow safety density window in high-temperature, high-density, and high-pressure wells.

[0016] A method for preparing a high-temperature resistant drilling plugging agent, the method comprising the following steps:

[0017] S1: The thermosetting phenolic resin powder, mica powder, titanium dioxide, polypropylene powder, polyurethane powder, hexamethylenetetramine, and maleic anhydride graft copolymer are mixed evenly in a mass ratio of 20:5:5:10:10:1:2 and added to a mixer.

[0018] S2: The material enters the mixer through the feed inlet. The servo motor on the feed inlet is started. The shaft of the servo motor drives the base to rotate. Multiple guide plates on the base beat and disperse the falling material, allowing it to spread in all directions. At the same time, the base drives the scraper to rotate, scraping off the material adhering to the inner wall of the feed inlet.

[0019] S3: When multiple materials enter the mixing machine, they will be ground and re-mixed by the mechanism inside the mixing machine. At this time, the equipment is heated to 200-240℃, mixed for 30 minutes, extruded, spun, cooled, and cut to obtain modified resin fibers.

[0020] S4: Adjust the twin-screw mixer to 40-60 rpm / min, and add ultrafine calcium carbonate, elastic graphite, and sepiolite wool in sequence from the feed inlet. Continue stirring for 20 minutes after adding the materials. Adjust the twin-screw mixer to 60-80 rpm / min, and add ceramic fiber, recycled carbon fiber, and modified resin fiber in sequence from the feed inlet. Continue stirring for 20 minutes after adding the materials. Finally, add marble sand and continue stirring for 30 minutes after adding the materials.

[0021] S5: After pouring all the raw materials into the twin-helix mixer and continuing to stir for 30-40 minutes, a high-temperature drilling plugging agent is obtained.

[0022] Preferably, the mixing mill has a feed inlet at the top, and several feed pipes communicating with the feed inlet are fixedly installed on the top of the feed inlet. A servo motor is fixedly installed on the top of the feed inlet, and several bases are fixedly installed on the output shaft of the servo motor. Guide plates are fixedly installed on the top of the bases, and scrapers are installed on the ends of the bases away from the output shaft of the servo motor. During operation, when material falls into the feed inlet through the feed pipes, the servo motor on the feed inlet is activated. The shaft of the servo motor drives the bases to rotate, and the multiple guide plates on the bases guide the falling material. The material is patted and dispersed, allowing the falling material to spread in all directions, rather than simply falling. When multiple materials fall through multiple feed pipes, the rotating guide plate of the patting action can further disperse and mix the various materials together, which is more conducive to subsequent mixing. The rotating guide plate of the patting action can also slow down the falling material and effectively prevent blockage. When the base rotates, it is easy to squeeze the falling material, causing the material to stick to the inner wall of the feed inlet. At this time, the scraper is used to clean the material adhering to the inner wall of the feed inlet, thereby making efficient use of the material.

[0023] Preferably, an inclined groove is provided on one side of the base, and an inclined slider is slidably connected inside the groove. The scraper and the slider are fixedly connected. The scraper is arc-shaped, and a spring is fixedly installed inside the groove. The other end of the spring is fixedly connected to the slider. During operation, by opening the inclined groove and installing the slider, when the scraper encounters material that is too tightly adhered, the scraper cannot remove it in one go. At this time, the arc-shaped scraper will slide and retract into the groove through the slider, thereby passing over the tightly adhered impurities. This effectively avoids the scraper being damaged by impact with the impurities. The tightly adhered material can be removed by subsequent scraping operations of the scraper.

[0024] Preferably, a crushing rod is fixedly installed on the inner wall of the scraper, and the crushing rod is conical. During operation, after the scraper passes over the tightly adhered material, the slider and scraper will return to their original position under the heating force of the spring. At this time, the crushing rod on one side of the scraper will impact and crush the tightly adhered material. After the crushing rod penetrates into the tightly adhered material, as the servo motor continues to rotate, it will drive the tightly adhered impurities to rotate away, thereby removing the tightly adhered impurities and achieving efficient cleaning.

[0025] Preferably, two protrusions are fixedly installed on the side of the scraper away from the crushing rod, and rollers are rotatably connected to the side of the two protrusions that are close to each other. The outer surface of the rollers is in contact with the inner wall of the feed inlet. During operation, the installation of rollers can reduce friction and facilitate rotation. At the same time, when encountering multiple continuously adhered and tightly stuck materials, when the scraper jumps up and resets, the rollers can be used to impact and crush the materials in front, thereby facilitating the scraping and cleaning work of the scraper.

[0026] Preferably, a rubber sealing ring is fixedly connected to the surface of the slider, and the surface of the sealing ring fits into the groove. A venting groove is provided at the end of the slider near the spring, and the other end of the venting groove passes through the scraper. An elastic rope is fixedly installed at the end of the venting groove inside the scraper. A connecting rod is slidably connected inside the venting groove, and one end of the elastic rope is fixedly connected to the connecting rod. During operation, by installing the sealing ring on the surface of the slider, the slider and the groove are in a sealed sliding connection. When the slider slides into the groove, it compresses the gas in the groove, causing the gas in the groove to enter the venting groove and then into the venting groove of the scraper. This pushes the connecting rod in the venting groove, causing the connecting rod to push the elastic rope towards the crushing rod. Since the crushing rod will pierce when crushing the adhering material, the connecting rod is used to impact and push the material on the crushing rod, causing the material to fall back into the feed inlet, thus efficiently utilizing the material.

[0027] Preferably, a receiving groove is formed in the guide plate directly below the feed pipe, and an electric actuator is fixedly installed in the receiving groove. The output rod of the electric actuator is rotatably connected to several arc-shaped guide blocks via a torsion spring. The free ends of the guide blocks are bent downwards, and elastic cloth is fixedly connected to the ends of the guide blocks that are close to each other. A sensor is fixedly installed on the outer surface of the feed pipe, and a controller is fixedly installed on the surface of the electric actuator. During operation, when a blockage occurs in the feed pipe, the sensor on the outer surface of the feed pipe positions the electric actuator, so that the guide plate with the electric actuator is positioned in the feed pipe. Directly below, the controller activates the electric actuator, causing it to move into the feed pipe via the output rod and the arc-shaped guide block. This allows the output rod and guide block to enter the feed pipe. The arc-shaped guide block facilitates insertion into the feed pipe, and as it leaves, it pulls the material out, thus clearing the pipe. The rotatably connected guide blocks can accommodate feed pipes of different sizes. Elastic cloth is installed between the guide blocks to prevent material from getting stuck and causing them to be difficult to reset.

[0028] Preferably, a fixing plate is fixedly installed on the output shaft surface of the electric actuator, and a corrugated pipe is fixedly connected to the bottom of the fixing plate. The other end of the corrugated pipe is fixedly connected to the electric actuator. During operation, by installing the fixing plate and the corrugated pipe, when the electric actuator moves, it will move the output shaft of the electric actuator together. At this time, the corrugated pipe can move with the output shaft, thereby protecting the output shaft of the electric actuator and preventing material from adhering to the surface of the output shaft of the electric actuator, thus effectively preventing the sliding of the output shaft of the electric actuator.

[0029] A process for using a high-temperature resistant drilling plugging agent, comprising the following steps:

[0030] X1: Before drilling to the geologically indicated easily leaking layer, add 2-3% of high-temperature resistant drilling plugging agent to the circulating circumferential well slurry. During the drilling of the easily leaking layer, add 3-4 bags of high-temperature resistant drilling plugging agent per hour at the feed port of the water tank.

[0031] X2: Prepare one tank of drilling plugging slurry in the surface storage tank. The formula of the drilling plugging slurry is 6-8% high temperature resistant drilling plugging agent in the well slurry. During the drilling of the easily leaky layer, pump 5-8 m³ of the storage drilling plugging slurry into the wellbore every 20-30 meters.

[0032] X3: After drilling through the easily leaking layer, pump in 8-10 m³ of reserve plugging slurry before each tripping operation to seal the easily leaking well section.

[0033] The beneficial effects of this invention are as follows:

[0034] 1. The present invention relates to a high-temperature resistant drilling plugging agent and its preparation method and application process. The high-temperature resistant drilling plugging agent made by using the above-mentioned materials has a temperature resistance of up to 220 degrees Celsius. When the dosage is 4%, the filtration loss is less than 20 mL. It is suitable for both water-based and oil-based drilling fluids. It effectively improves the problems of single composition, poor fiber toughness, and low temperature resistance. It can solve the problem of leakage prevention and plugging of pores, natural micro-fractures, and induced fractures, especially the problem of narrow safety density window in high-temperature, high-density, and high-pressure wells.

[0035] 2. The high-temperature resistant drilling plugging agent and its preparation method and application process described in this invention involve activating a servo motor on the feed inlet when material falls through the feed pipe into the feed port. The servo motor's shaft drives the base to rotate, and multiple guide plates on the base beat and disperse the falling material, allowing it to spread outwards rather than simply falling. Furthermore, when multiple materials fall through multiple feed pipes, the rotating guide plates can further disperse and mix them, facilitating subsequent mixing. The rotating guide plates also slow down the material's fall, effectively preventing blockages. During base rotation, the falling material is easily squeezed and adheres to the inner wall of the feed inlet. A scraper then cleans the material adhering to the inner wall of the feed inlet, thus efficiently utilizing the material. Attached Figure Description

[0036] The invention will now be further described with reference to the accompanying drawings.

[0037] Figure 1 This is a schematic flowchart of the preparation method of the high-temperature resistant drilling plugging agent in this invention;

[0038] Figure 2 This is a schematic diagram of the mixing machine in this invention;

[0039] Figure 3 This is a cross-sectional view of the feed inlet in this invention;

[0040] Figure 4 This is a cross-sectional view of the base in this invention;

[0041] Figure 5 This is a cross-sectional view of the scraper in this invention;

[0042] Figure 6 In this invention Figure 3 A schematic diagram of the structure at point A;

[0043] Figure 7 This is a cross-sectional view of the guide plate in this invention;

[0044] Figure 8 This is a schematic diagram of the structure at the bellows in Embodiment 2 of the present invention;

[0045] Figure 9 This is a schematic diagram of the process for using the high-temperature resistant drilling plugging agent in this invention.

[0046] In the diagram: 1. Mixer; 2. Feed inlet; 3. Servo motor; 4. Feed pipe; 5. Base; 6. Guide plate; 7. Scraper; 8. Slide groove; 9. Slider; 10. Spring; 11. Crushing rod; 12. Roller; 13. Ventilation groove; 14. Sealing ring; 15. Elastic rope; 16. Connecting rod; 17. Storage groove; 18. Electric actuator; 19. Guide block; 20. Elastic cloth; 21. Fixing plate; 22. Corrugated pipe. Detailed Implementation

[0047] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0048] A high-temperature resistant plugging agent for drilling, comprising the following raw materials in parts by weight:

[0049] 10-20 parts ceramic fiber;

[0050] 10-20 parts of modified resin fiber;

[0051] 25-35 parts of meerschaum;

[0052] 5-8 parts recycled carbon fiber;

[0053] 10-20 parts of elastic graphite;

[0054] 25-35 parts of ultrafine calcium carbonate;

[0055] Marble sand, 20-30 parts.

[0056] The high-temperature resistant plugging agent in this invention has the following effects:

[0057] The high-temperature resistant plugging agent made by using the above materials has a temperature resistance of up to 220 degrees Celsius. When the dosage is 4%, the filtration loss is less than 20 mL. It is suitable for both water-based and oil-based drilling fluids. It effectively improves the problems of single composition, poor fiber toughness, and low temperature resistance. It can solve the problems of leakage prevention and plugging of pores, natural micro-fractures, and induced fractures, especially the problem of narrow safety density window in high-temperature, high-density, and high-pressure wells.

[0058] like Figure 1 As shown, a method for preparing a high-temperature resistant drilling plugging agent is described. This method, used to prepare the aforementioned high-temperature resistant drilling plugging agent, includes the following steps:

[0059] S1: The thermosetting phenolic resin powder, mica powder, titanium dioxide, polypropylene powder, polyurethane powder, hexamethylenetetramine, and maleic anhydride graft copolymer are mixed evenly in a mass ratio of 20:5:5:10:10:1:2 and added to mixer 1.

[0060] S2: The material enters the mixing machine 1 through the feed inlet 2. The servo motor 3 on the feed inlet 2 is started. The shaft of the servo motor 3 drives the base 5 to rotate. Multiple guide plates 6 on the base 5 beat and disperse the falling material, so that the falling material can spread in all directions. At the same time, the base 5 drives the scraper 7 to rotate, and the scraper 7 scrapes off the material adhering to the inner wall of the feed inlet 2.

[0061] S3: When multiple materials enter the mixer 1, they will be ground and re-mixed by the mechanism inside the mixer 1. At this time, the equipment is heated to 200-240℃, mixed for 30 minutes, extruded, spun, cooled, and cut to obtain modified resin fibers.

[0062] S4: Adjust the twin-screw mixer to 40-60 rpm / min, and add ultrafine calcium carbonate, elastic graphite, and sepiolite wool sequentially through feed inlet 2. Continue stirring for 20 minutes after adding the materials. Adjust the twin-screw mixer to 60-80 rpm / min, and add ceramic fiber, recycled carbon fiber, and modified resin fiber sequentially through feed inlet 2. Continue stirring for 20 minutes after adding the materials. Finally, add marble sand and continue stirring for 30 minutes after adding the materials.

[0063] S5: After pouring all the raw materials into the twin-helix mixer and continuing to stir for 30-40 minutes, a high-temperature drilling plugging agent is obtained. Example 1

[0064] like Figures 2-7 As shown, the mixing machine 1 has a feed inlet 2 at its top. Several feed pipes 4 communicating with the feed inlet 2 are fixedly installed on the top of the feed inlet 2. A servo motor 3 is fixedly installed on the top of the feed inlet 2. Several bases 5 are fixedly installed on the output shaft of the servo motor 3. Guide plates 6 are fixedly installed on the top of each base 5. A scraper 7 is installed at the end of each base 5 away from the output shaft of the servo motor 3. During operation, when material falls into the feed inlet 2 through the feed pipes 4, the servo motor 3 on the feed inlet 2 is activated. The shaft of the servo motor 3 drives the bases 5 to rotate, utilizing the multiple guide plates on the bases 5. Plate 6 pats and disperses the falling material, allowing it to spread outwards rather than simply falling. Furthermore, when multiple materials fall through the multiple feed pipes 4, the rotating guide plate 6 further disperses and mixes them, facilitating subsequent mixing. The rotating guide plate 6 also slows down the falling material, effectively preventing blockages. When the base 5 rotates, it easily squeezes the falling material, causing it to adhere to the inner wall of the feed inlet 2. The scraper 7 then cleans the material adhering to the inner wall of the feed inlet 2, thus ensuring efficient material utilization.

[0065] An inclined groove 8 is provided on one side of the base 5. An inclined slider 9 is slidably connected inside the groove 8. The scraper 7 and the slider 9 are fixedly connected. The scraper 7 is arc-shaped. A spring 10 is fixedly installed inside the groove 8. The other end of the spring 10 is fixedly connected to the slider 9. During operation, by opening the inclined groove and installing the slider 9, when the scraper 7 encounters material that is too tightly adhered, the scraper 7 cannot scrape it off in one go. At this time, the arc-shaped scraper 7 will slide and retract into the groove 8 through the slider 9, thereby passing over the tightly adhered impurities. This effectively avoids the scraper 7 being damaged after colliding with the impurities. The tightly adhered material can be removed by multiple scraping operations of the scraper 7.

[0066] A crushing rod 11 is fixedly installed on the inner wall of the scraper 7. The crushing rod 11 is conical. During operation, after the scraper 7 passes over the tightly adhered material, the slider 9 and the scraper 7 will reset under the heating force of the spring 10. At this time, the crushing rod 11 on one side of the scraper 7 will impact and crush the tightly adhered material. After the crushing rod 11 penetrates into the tightly adhered material, as the servo motor 3 continues to rotate, it will drive the tightly adhered impurities to rotate away, thereby removing the tightly adhered impurities and achieving efficient cleaning.

[0067] Two protrusions are fixedly installed on the side of the scraper 7 away from the crushing rod 11. Rollers 12 are rotatably connected to the side of the two protrusions that are close to each other. The outer surface of the rollers 12 is in contact with the inner wall of the feed inlet 2. During operation, the installation of rollers 12 can reduce friction and facilitate rotation. At the same time, when encountering multiple continuously adhered materials, when the scraper 7 jumps up and resets, the rollers 12 can be used to impact and crush the materials in front, thereby facilitating the scraping and cleaning work of the scraper 7.

[0068] A rubber sealing ring 14 is fixedly connected to the surface of the slider 9. The surface of the sealing ring 14 is in contact with the slide groove 8. A venting groove 13 is provided at one end of the slider 9 near the spring 10. The other end of the venting groove 13 passes through the scraper 7. An elastic rope 15 is fixedly installed at one end of the venting groove 13 inside the scraper 7. A connecting rod 16 is slidably connected inside the venting groove 13. One end of the elastic rope 15 is fixedly connected to the connecting rod 16. During operation, by installing the sealing ring 14 on the surface of the slider 9, the slider 9 and the slide groove are connected... 8 is in a sealed sliding connection. When the slider 9 slides into the slide groove 8, it will squeeze the gas in the slide groove 8, so that the gas in the slide groove 8 enters the ventilation groove 13, and then enters the ventilation groove 13 of the scraper 7, thereby pushing the connecting rod 16 in the ventilation groove 13. The connecting rod 16, along with the elastic rope 15, is pushed towards the crushing rod 11. Since the crushing rod 11 will pierce when crushing the adhering material, the connecting rod 16 is used to impact and push the material on the crushing rod 11, so that the material falls back into the feed inlet 2, thereby making efficient use of the material.

[0069] A receiving groove 17 is provided in the guide plate 6 located directly below the feed pipe 4. An electric push rod 18 is fixedly installed in the receiving groove 17. The output rod of the electric push rod 18 is rotatably connected to several arc-shaped guide blocks 19 through a torsion spring. The free end of the guide block 19 is bent downward. An elastic cloth 20 is fixedly connected to one end of the several guide blocks 19 that are close to each other. A sensor is fixedly installed on the outer surface of the feed pipe 4. A controller is fixedly installed on the surface of the electric push rod 18.

[0070] During operation, when a blockage occurs in the feed pipe 4, the sensor on the outer surface of the feed pipe 4 positions the electric push rod 18, so that the guide plate 6 with the electric push rod 18 is directly below the feed pipe 4. At this time, the controller starts the electric push rod 18, which moves the electric push rod 18 into the feed pipe 4 through the output rod and the arc-shaped guide block 19. The output rod of the electric push rod 18 and the guide block 19 enter the feed pipe 4. The arc-shaped guide block 19 can be inserted into the feed pipe 4 more easily. At the same time, when the guide block 19 leaves the feed pipe 4, it will drive the material in the feed pipe 4 away, thereby clearing the feed pipe 4. The rotatably connected guide block 19 can adapt to feed pipes 4 of different sizes. The elastic cloth 20 installed between several guide blocks 19 is to prevent the material from getting stuck between several guide blocks 19, which would make it difficult for the guide blocks 19 to reset. Example 2

[0071] like Figure 8 As shown, a fixing plate 21 is fixedly installed on the output shaft surface of the electric actuator 18. A bellows 22 is fixedly connected to the bottom of the fixing plate 21, and the other end of the bellows 22 is fixedly connected to the electric actuator 18. During operation, by installing the fixing plate 21 and the bellows 22, when the electric actuator 18 moves, it will move along with the output shaft of the electric actuator 18. At this time, the bellows 22 can move with the output shaft, thereby protecting the output shaft of the electric actuator 18 and preventing materials from adhering to the surface of the output shaft of the electric actuator 18, thus effectively preventing the sliding of the output shaft of the electric actuator 18.

[0072] like Figure 9 As shown, a process for using a high-temperature resistant drilling plugging agent is described above. This process includes the following steps:

[0073] X1: Before drilling to the geologically indicated easily leaking layer, add 2-3% of high-temperature resistant drilling plugging agent to the circulating circumferential well slurry. During the drilling of the easily leaking layer, add 3-4 bags of high-temperature resistant drilling plugging agent per hour at the feed port of the water tank.

[0074] X2: Prepare one tank of drilling plugging slurry in the surface storage tank. The formula of the drilling plugging slurry is 6-8% high temperature resistant drilling plugging agent in the well slurry. During the drilling of the easily leaky layer, pump 5-8 m³ of the storage drilling plugging slurry into the wellbore every 20-30 meters.

[0075] X3: After drilling through the easily leaking layer, pump in 8-10 m³ of reserve plugging slurry before each tripping operation to seal the easily leaking well section.

[0076] Working principle: When material falls into inlet 2 through feed pipe 4, servo motor 3 on inlet 2 is activated. The shaft of servo motor 3 drives base 5 to rotate. Multiple guide plates 6 on base 5 beat and disperse the falling material, allowing it to spread outwards instead of simply falling. When multiple materials fall through multiple feed pipes 4, the rotating guide plates 6 can further mix them together, which is more conducive to subsequent mixing. The rotating guide plates 6 can also slow down the falling material, effectively preventing blockage. When base 5 rotates, it is easy to squeeze the falling material, causing it to stick to the inner wall of inlet 2. At this time, scraper 7 is used to clean the material adhering to the inner wall of inlet 2, thus making efficient use of the material.

[0077] By opening an inclined groove and installing a slider 9, when the scraper 7 encounters material that is too tightly adhered, the scraper 7 cannot scrape it off in one go. At this time, the arc-shaped scraper 7 will slide and retract into the groove 8 through the slider 9, thereby passing over the impurities that are too tightly adhered. This effectively avoids the situation where the scraper 7 is damaged after colliding with the impurities. The material that is too tightly adhered can be removed by multiple scraping operations of the subsequent scraper 7.

[0078] After the scraper 7 passes over the tightly adhered material, the slider 9 and the scraper 7 will reset under the heating force of the spring 10. At this time, the crushing rod 11 on one side of the scraper 7 will impact and crush the tightly adhered material. After the crushing rod 11 penetrates into the tightly adhered material, as the servo motor 3 continues to rotate, it will drive the tightly adhered impurities to rotate and leave, thereby removing the tightly adhered impurities and achieving efficient cleaning.

[0079] By installing rollers 12, friction can be reduced and rotation can be facilitated. When encountering multiple tightly adhered materials, when the scraper 7 jumps up and resets, the rollers 12 can be used to impact and crush the materials in front, thus facilitating the scraping and cleaning work of the scraper 7.

[0080] By installing a sealing ring 14 on the surface of the slider 9, the slider 9 and the slide groove 8 are in a sealed sliding connection. When the slider 9 slides into the slide groove 8, it will squeeze the gas in the slide groove 8, so that the gas in the slide groove 8 enters the ventilation groove 13, and then enters the ventilation groove 13 of the scraper 7, thereby pushing the connecting rod 16 in the ventilation groove 13. The connecting rod 16, along with the elastic rope 15, is pushed towards the crushing rod 11. Since the crushing rod 11 will pierce when crushing the adhering material, the connecting rod 16 is used to impact and push the material on the crushing rod 11, so that the material falls back into the feed inlet 2, thereby making efficient use of the material. When a blockage occurs in the feed pipe 4, the sensor on the outer surface of the feed pipe 4 positions the electric push rod 18, so that the guide plate 6 with the electric push rod 18 is directly below the feed pipe 4. At this time, the controller starts the electric push rod 18, so that the electric push rod 18 moves into the feed pipe 4 through the output rod and the arc-shaped guide block 19. The output rod of the electric push rod 18 and the guide block 19 enter the feed pipe 4. The arc-shaped guide block 19 can be inserted into the feed pipe 4 more easily. At the same time, when the guide block 19 leaves the feed pipe 4, it will drive the material in the feed pipe 4 away, thereby clearing the feed pipe 4. The rotatably connected guide block 19 can adapt to feed pipes 4 of different sizes. The elastic cloth 20 installed between several guide blocks 19 is to prevent the material from getting stuck between several guide blocks 19, which would make it difficult for the guide blocks 19 to reset.

[0081] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0082] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0083] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a high-temperature resistant plugging agent for drilling, characterized in that: The anti-high-temperature while-drilling plugging agent is composed of the following raw materials by weight: ceramic fiber 10-20 parts; modified resin fiber 10-20 parts; sepiolite 25-35 parts; regenerated carbon fiber 5-8 parts; elastic graphite 10-20 parts; ultra-fine calcium carbonate 25-35 parts; marble sand 20-30 parts; The method comprises the following steps: S1: uniformly mix the thermosetting phenolic resin powder, mica powder, titanium white powder, polypropylene powder, polyurethane powder, hexamethylene tetramine, and maleic anhydride graft copolymer according to a mass ratio of 20:5:5:10:10:1:2, and add them into a mixing machine (1); S2: the materials enter the mixing machine (1) through the feeding port (2), the servo motor (3) on the feeding port (2) is started, the shaft of the servo motor (3) is used to drive the base (5) to rotate, the multiple guide plates (6) on the base (5) are used to beat and disperse the falling materials, so that the falling materials can diffuse to all directions, and the base (5) drives the scraper (7) to rotate, and the scraper (7) is used to scrape off the materials adhered to the inner wall of the feeding port (2); S3: after the multiple materials enter the mixing machine (1), they are ground and re-mixed by the mechanism in the mixing machine (1), at this time, the equipment is heated to 200-240℃, mixed for 30 min, extruded, jetted, cooled, and cut to obtain the modified resin fiber; S4: adjust the double-spiral mixing machine to 40-60 rpm, and add the ultra-fine calcium carbonate, elastic graphite, and sepiolite into the feeding port (2) in sequence, continue to stir for 20 min after the addition is completed; adjust the double-spiral mixing machine to 60-80 rpm, and add the ceramic fiber, regenerated carbon fiber, and modified resin fiber into the feeding port (2) in sequence, continue to stir for 20 min after the addition is completed, and finally add the marble sand, and continue to stir for 30 min after the addition is completed; S5: after all the raw materials are poured into the double-spiral mixing machine, continue to stir for 30-40 min to obtain the anti-high-temperature while-drilling plugging agent; The top of the mixing machine (1) is provided with a feeding port (2), a plurality of feeding pipes (4) are fixedly installed on the top of the feeding port (2) and communicate with the feeding port (2), a servo motor (3) is fixedly installed on the top of the feeding port (2), a plurality of bases (5) are fixedly installed on the output shaft of the servo motor (3), guide plates (6) are fixedly installed on the top of the bases (5), and scrapers (7) are installed on the ends of the bases (5) away from the output shaft of the servo motor (3); The guide plates (6) directly below the feeding pipes (4) are provided with receiving grooves (17) therein, electric push rods (18) are fixedly installed in the receiving grooves (17), a plurality of arc-shaped guide blocks (19) are fixedly installed on the output rods of the electric push rods (18), the free ends of the guide blocks (19) are bent downward, elastic cloths (20) are fixedly connected to the ends of the guide blocks (19) close to each other, inductors are fixedly installed on the outer surfaces of the feeding pipes (4), and controllers are fixedly installed on the surfaces of the electric push rods (18).

2. The preparation method of the high-temperature-resistant leak plugging agent while drilling according to claim 1, characterized in that: The base (5) is provided with an inclined chute (8) on one side, the inside of the chute (8) is slidably connected with an inclined sliding block (9), the scraper (7) and the sliding block (9) are fixedly connected, the scraper (7) is arc-shaped, the inside of the chute (8) is fixedly installed with a spring (10), the other end of the spring (10) is fixedly connected with the sliding block (9).

3. The preparation method of the high-temperature-resistant leak plugging agent while drilling according to claim 2, characterized in that: The inner wall of the scraper (7) is fixedly installed with a crushing rod (11), the crushing rod (11) is conical.

4. The preparation method of the high-temperature-resistant leak plugging agent while drilling according to claim 3, characterized in that: The side of the scraper (7) away from the crushing rod (11) is fixedly installed with two protrusions, the side of the two protrusions close to each other is rotatably connected with a roller (12), the outer surface of the roller (12) is attached to the inner wall of the feeding port (2).

5. The preparation method of the high-temperature-resistant leak plugging agent while drilling according to claim 4, characterized in that: The surface of the sliding block (9) is fixedly connected with a sealing ring (14) made of rubber, the surface of the sealing ring (14) is attached to the chute (8), the end of the sliding block (9) close to the spring (10) is provided with a ventilation groove (13), the other end of the ventilation groove (13) penetrates the scraper (7), the end of the ventilation groove (13) in the scraper (7) is fixedly installed with an elastic rope (15), the inside of the ventilation groove (13) is slidably connected with a connecting rod (16), one end of the elastic rope (15) is fixedly connected with the connecting rod (16).

6. The preparation method of the high-temperature-resistant leak plugging agent while drilling according to claim 5, characterized in that: The output shaft surface of the electric push rod (18) is rotatably connected with a fixed plate (21) through a torsion spring, the bottom of the fixed plate (21) is fixedly connected with a bellows (22), the other end of the bellows (22) is fixedly connected with the electric push rod (18).

Images