Controllable intercepting plugging tool and plugging method

Abstract

The present application relates to the technical fields of drilling operation tools, and is a controllable intercepting type plugging tool and a plugging method. The former comprises an intercepting bag with a bag-shaped structure, and an upper joint, a first connecting joint, a first casing, a casing joint, a second connecting joint, a second casing, a third connecting joint, a third casing and a gauge joint which are fixed and installed together in sequence from top to bottom. The present application has a reasonable and compact structure. Compared with the traditional processing mode, the present application can accurately control the plugging material downhole position, so that the plugging material solidifies at the lost formation, the plugging effect is remarkable, the amount of plugging material can be accurately controlled, the amount of plugging material can be greatly reduced, the cost is saved, the plugging material and the plugging material dissolving agent are separately filled, and mixing is started after the drilling tool is lowered, which effectively avoids the situation that the plugging material solidifies in advance and blocks the drilling tool. The present application is simple and practical, convenient to construct, safe and reliable, and has strong practicability.

Description

Technical Field

[0001] This invention relates to the field of drilling operation tools technology, and is a controllable interception-type leak sealing tool and leak sealing method. Background Technology

[0002] As exploration and development deepen, the number of marginal wells, deep wells, and wells in special formations is gradually increasing, leading to a growing impact from injection and fracturing, and making well leakage problems more prominent. When large fractures or other severe leakage occur, because the fracture width is greater than the maximum particle size of the plugging material, conventional methods such as cement grouting cannot effectively retain the plugging material, resulting in severe loss and a low success rate of plugging.

[0003] Through scientific research, significant progress has been made both domestically and internationally in addressing well leakage problems related to permeability and small-scale fractures. However, current plugging methods for formations with severe leakage, such as large fractures and karst caverns, have the following drawbacks: ① It is difficult to control the placement of the plugging material; ② The dosage is difficult to control, resulting in poor plugging effectiveness; ③ The plugging material may prematurely set, posing a risk of clogging the drill string. This leads to a low success rate for plugging severe leakage on a single attempt, long plugging cycles, strong reliance on field experience, and difficulty in replicating successful plugging methods.

[0004] Studies have shown that using plugging tools to intercept plugging materials at designated locations, prolonging the material's residence time, and controlling the amount of material prepared and the setting time can effectively seal large fractures of varying sizes, thereby improving the quality of oil and gas well drilling. This is currently the most effective sealing method for large fractures and cavernous formations with lost circulation. Summary of the Invention

[0005] This invention provides a controllable interception-type leak-stopping tool and method, which overcomes the shortcomings of the prior art. It can effectively solve the problems of low success rate of first-time leak-stopping, long leak-stopping cycle, strong reliance on on-site construction experience, and difficulty in replicating successful leak-stopping methods in existing malignant leaks.

[0006] One of the technical solutions of this invention is achieved through the following measures: a controllable interception-type leak-stopping tool, comprising an interception bag with a bag-like structure and, from top to bottom, an upper connector, a first connecting connector, a first sleeve, a sleeve connector, a second connecting connector, a second sleeve, a third connecting connector, a third sleeve, and a gauge-maintaining connector, all fixed together in sequence. A first cover plate is fixed to the upper end of the first connecting connector. A plurality of first connecting holes, communicating internally and externally, are evenly distributed circumferentially on the outer side of the upper part of the first connecting connector corresponding to the position below the first cover plate. A first sliding sleeve is sealed between the outer side of the upper part of the first connecting connector corresponding to the position of the first connecting hole and the inner side of the lower part of the upper connector. A plurality of first shear pins, with their ends fixed to the outer side of the first sliding sleeve, are distributed circumferentially on the lower part of the upper connector. A second cover plate is fixed to the upper end of the second connecting connector. A plurality of second connecting holes, communicating internally and externally, are evenly distributed circumferentially on the outer side of the upper part of the second connecting connector corresponding to the position of the second connecting hole. A second sliding sleeve is sealed between the outer side of the upper part of the second connecting connector corresponding to the position of the second connecting hole and the inner side of the lower part of the sleeve connector. A plurality of first shear pins, with their ends fixed to the outer side of the second sliding sleeve, are distributed circumferentially on the lower part of the sleeve connector. A flow divider plate is fixedly installed on the inner side of the lower part of the second connecting joint on the outer side of the sliding sleeve. Several vertically penetrating flow divider holes are evenly distributed at the upper end of the flow divider plate. A mixing tube fitted inside the second sleeve is fixedly installed in the center of the flow divider plate. A pressure plate is sealed between the outer side of the upper part of the mixing tube and the inner side of the second sleeve at the lower end of the second connecting joint. A connecting tube fitted into the inner side of the upper part of the third connecting joint is fixedly installed at the lower end of the mixing tube. A straight pipe joint is sealed on the outer side of the lower part of the connecting tube. Several end-fixed joints are distributed circumferentially along the outer side of the straight pipe joint. The third shear pin on the outside of the pipe has an aluminum rod fixedly installed at the lower end of the straight pipe joint, which is fitted inside the third connecting joint. An oil pipe joint is fixedly installed on the lower inner side of the third connecting joint. A partition plate is fixedly installed on the upper inner side of the oil pipe joint, which is fixedly installed together with the lower end of the aluminum rod. The lower outer side of the oil pipe joint and the bag opening of the interception bag are fixedly installed together. A connecting oil pipe fitted inside the interception bag is fixedly installed on the lower inner side of the oil pipe joint. A guide shoe is sealed at the lower end of the connecting oil pipe. Several fourth shear pins with their ends fixed to the outside of the connecting oil pipe are evenly distributed around the outside of the guide shoe along the circumference.

[0007] The following are further optimizations and / or improvements to one of the above-mentioned technical solutions: The upper inner side of the aforementioned upper connector has a first stepped surface that contacts the upper end of the first sliding sleeve, the upper outer side of the first connecting connector corresponding to the position below the first sliding sleeve has a second stepped surface, the inner side of the sleeve connector has a third stepped surface that contacts the upper end of the second sliding sleeve, and the upper outer side of the second connecting connector corresponding to the position below the second sliding sleeve has a fourth stepped surface.

[0008] The lower outer side of the first connecting joint, which corresponds to the position between the second step surface and the lower part of the first sliding sleeve, may have at least one first flow hole that communicates with the inside and outside distributed along the circumference. The lower outer side of the sleeve joint, which corresponds to the position between the fourth step surface and the lower part of the second sliding sleeve, may have at least one second flow hole that communicates with the inside and outside distributed along the circumference.

[0009] The lower end of the aforementioned shoe may have a support head shaped like a spherical crown.

[0010] The lower outer side of the aforementioned oil pipe joint may be provided with several fixed annular grooves spaced vertically.

[0011] The second technical solution of the present invention is achieved through the following measures: a leak-sealing method, comprising the following steps: Step S1: First, fill the sealing material into the annular cavity formed by the upper end of the partition plate, the lower end of the pressure plate, the inner side of the second sleeve and the outer side of the mixing pipe. Then, fill the sealing material solvent into the cavity formed by the lower end of the first cover plate, the upper end of the second cover plate, the inner side of the first connecting joint, the inner side of the first sleeve and the inner side of the sleeve joint. Step S2: After the upper end of the upper connector of the controllable interception plugging tool is connected to the drill string, the controllable interception plugging tool is lowered into the well to the position corresponding to the lost circulation zone through the drill string; Step S3: After adding packer fluid to the wellhead, turn on the mud pump and pump drilling fluid into the upper connector; Step S4: First pressurization, cut the first shear pin, the first sliding sleeve moves downward to below the first connecting hole, and the drilling fluid enters the first casing through the first connecting hole; Step S5: Second pressurization, cut the second shear pin, the second sliding sleeve moves downward to below the second connecting hole, and the plugging material solvent is pushed into the second connecting joint and mixing pipe by the drilling fluid; Step S6: Third pressurization, cut the third shear pin, the straight pipe joint separates from the connecting pipe and moves downward. Part of the sealant solvent passes through the diversion plate and generates pressure on the upper surface of the pressure plate, thereby pushing the sealant material downward. Another part of the sealant solvent passes through the mixing pipe and is sprayed at the lower end of the connecting pipe and mixed with the sealant material. At the same time, the partition plate moves downward and contacts the guide shoe. Step S7: Fourth pressurization, cut the fourth shear pin, the guide shoe and the connecting oil pipe are separated, and the interception bag is pulled out from the diameter protection joint; Step S8: The mixture of the plugging material and the plugging material solvent is filled into the interception bag through the lower end of the connecting oil pipe; Step S9: Slowly lift the drill string according to the pumping flow rate of the mud pump, and continuously fill the interception bag with the mixed plugging material, so that the interception bag expands under pressure at the leakage location; Step S10: Stop the pump and wait for the mixed sealing material to solidify.

[0012] The following are further optimizations and / or improvements to the second technical solution of the above invention: After step S10 is completed, the following steps are also included: Step S11: Raise the drill string and start pumping the mixed plugging agent directly at the wellhead.

[0013] Step S12: Stop the pump and observe the leak sealing effect; Step S13: Complete the leak sealing operation, remove the drill string, and wait for the subsequent drilling operation to continue.

[0014] In step S1 above, the sealing materials include cement and dry powder, and the solvent for the sealing materials includes water.

[0015] This invention features a reasonable and compact structure. Compared to traditional methods, it allows for precise control of the placement of the sealing material, ensuring it solidifies at the site of the leakage, resulting in a significant sealing effect. It also allows for precise control of the amount of sealing material prepared, greatly reducing material usage and saving costs. By separately loading the sealing material and its solvent, and mixing them after the drilling tool is lowered into the system, it effectively prevents premature solidification of the sealing material and subsequent blockage of the drilling tool. This invention is simple, practical, easy to construct, safe, and reliable, possessing strong practicality. Attached Figure Description

[0016] Appendix Figure 1 This is a schematic diagram of the front cross-sectional structure of the present invention.

[0017] The codes in the attached diagram are as follows: 1 for interception bag, 2 for upper connector, 3 for first connecting connector, 4 for first sleeve, 5 for sleeve connector, 6 for second connecting connector, 7 for second sleeve, 8 for third connecting connector, 9 for third sleeve, 10 for gauge protection connector, 11 for first sliding sleeve, 12 for first shear pin, 13 for first cover plate, 14 for first connecting hole, 15 for second sliding sleeve, 16 for second shear pin, 17 for second cover plate, 18 for second connecting hole, and 19 for diversion. Plate, 20 is a diversion hole, 21 is a mixing pipe, 22 is a pressure plate, 23 is a connecting pipe, 24 is a straight pipe connector, 25 is an aluminum rod, 26 is a partition plate, 27 is a third shear pin, 28 is a fourth shear pin, 29 is an oil pipe connector, 30 is a connecting oil pipe, 31 is a guide shoe, 32 is a first step surface, 33 is a second step surface, 34 is a third step surface, 35 is a fourth step surface, 36 is a first flow hole, 37 is a second flow hole, 38 is a support head, and 39 is a fixing ring groove. Detailed Implementation

[0018] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0019] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as front, back, top, bottom, left, right, etc. The positional relationships are determined based on the layout direction of the attached diagram in the instruction manual.

[0020] The present invention will be further described below with reference to embodiments and accompanying drawings: Example 1: As shown in the attached document Figure 1 As shown, the controllable interception-type leak-stopping tool includes a bag-shaped interception bag 1 and, from top to bottom, an upper connector 2, a first connecting connector 3, a first sleeve 4, a sleeve connector 5, a second connecting connector 6, a second sleeve 7, a third connecting connector 8, a third sleeve 9, and a gauge-maintaining connector 10, all fixed together in sequence. A first cover plate 13 is fixed to the upper end of the first connecting connector 3. A plurality of first connecting holes 14, communicating internally and externally, are evenly distributed along the circumference on the upper outer side of the first connecting connector 3 corresponding to the position below the first cover plate 13. A sealing sleeve is fitted between the upper outer side of the first connecting connector 3 and the lower inner side of the upper connector 2 at the positions corresponding to the first connecting holes 14. The first sliding sleeve 11 has several first shear pins 12, the ends of which are fixed to the outside of the first sliding sleeve 11, distributed circumferentially at the lower part of the upper connector 2. The upper end of the second connecting connector 6 is fixed with a second cover plate 17. The upper outer part of the second connecting connector 6, corresponding to the position below the second cover plate 17, has several second connecting holes 18, the inner and outer sides of which are evenly distributed circumferentially at the lower part of the second connecting connector 6. The upper outer part of the second connecting connector 6, corresponding to the position of the second connecting hole 18, and the lower inner part of the sleeve connector 5 are sealed together with a second sliding sleeve 15. The lower part of the sleeve connector 5 has several second shear pins 16, the ends of which are fixed to the outside of the second sliding sleeve 15, distributed circumferentially at the lower part of the second connecting connector 6. A flow divider plate 19 is fixedly installed on the inner side of the part. Several flow divider holes 20 are evenly distributed at intervals on the upper end of the flow divider plate 19. A mixing pipe 21 fitted inside the second sleeve 7 is fixedly installed in the center of the flow divider plate 19. A pressure plate 22 is sealed between the outer upper part of the mixing pipe 21 and the inner side of the second sleeve 7, corresponding to the lower end of the second connecting joint 6. A connecting pipe 23 is fixedly installed at the lower end of the mixing pipe 21, which is fitted inside the upper part of the third connecting joint 8. A straight pipe joint 24 is sealed on the outer lower part of the connecting pipe 23. Several third shear pins 27 with their ends fixed to the outer side of the connecting pipe 23 are distributed circumferentially on the outer side of the straight pipe joint 24. An aluminum rod 25, fitted inside the third connecting joint 8, is fixedly installed at the lower end of the straight pipe joint 24. An oil pipe joint 29 is fixedly installed at the lower inner side of the third connecting joint 8. A partition plate 26, fixedly installed together with the lower end of the aluminum rod 25, is sealed and fitted at the upper inner side of the oil pipe joint 29. The lower outer side of the oil pipe joint 29 is sealed and fixed together with the opening of the interception bag 1. A connecting oil pipe 30, fitted inside the interception bag 1, is fixedly installed at the lower inner side of the oil pipe joint 29. A guide shoe 31 is sealed and fitted at the lower end of the connecting oil pipe 30. Several fourth shear pins 28, with their ends fixed to the outside of the connecting oil pipe 30, are evenly distributed along the circumference of the guide shoe 31.

[0021] According to requirements, two first sealing rings are provided vertically and horizontally between the outer side of the first sliding sleeve 11 above the first shear pin 12 and the inner side of the upper connector 2. The lower end of the first connecting connector 3 and the upper end of the first sleeve 4 are sealed and screwed together. A second sealing ring is provided between the outer side of the first connecting connector 3 above and below the first connecting hole 14 and the inner side of the first sliding sleeve 11. The lower end of the first sliding sleeve 11 and the upper end of the sleeve connector 5 are sealed and screwed together. Two third sealing rings are provided vertically and horizontally between the outer side of the second sliding sleeve 15 above the second shear pin 16 and the inner side of the sleeve connector 5. A fourth sealing ring is provided between the outer side of the second connecting connector 6 above and below the second connecting hole 18 and the inner side of the second sliding sleeve 15. The lower end of the second connecting connector 6 and the upper end of the second sleeve 7 are sealed and screwed together. Two third sealing rings are evenly distributed vertically and horizontally on both the inner and outer sides of the pressure plate 22. A first annular groove is provided, in which a first sealing ring and a fifth sealing ring are installed sequentially from top to bottom. The lower end of the second sleeve 7 and the upper end of the third connecting joint 8 are sealed and screwed together. A sixth sealing ring is installed between the inner side of the straight pipe joint 24 above and below the third shear pin 27 and the outer side of the connecting pipe 23. The upper end of the oil pipe joint 29 and the lower end of the third connecting joint 8 are sealed and screwed together. A second annular groove is provided on the outer side of the partition plate 26. A second sealing ring and a third sealing ring are provided vertically and horizontally in the second annular groove. A seventh sealing ring is installed between the second sealing ring and the third sealing ring. An eighth sealing ring is provided between the upper inner side of the guide shoe 31 above the fourth shear pin 28 and the outer side of the connecting oil pipe 30. Two ninth sealing rings are provided vertically and horizontally between the lower inner side of the guide shoe 31 below the fourth shear pin 28 and the outer side of the connecting oil pipe 30.

[0022] During use, a cavity is formed by the lower end of the first cover plate 13, the upper end of the second cover plate 17, the inner side of the first connecting joint 3, the inner side of the first casing 4, and the inner side of the casing joint 5, for filling with the plugging material solvent. An annular cavity is formed by the upper end of the partition plate 26, the lower end of the pressure plate 22, the inner side of the second casing 7, and the outer side of the mixing pipe 21, for filling with the plugging material. This invention has a reasonable and compact structure. Compared with traditional methods, it can accurately control the placement of the plugging material, allowing it to solidify at the site of the leakage, resulting in a significant plugging effect. By pre-filling the cavity with the plugging material solvent and then filling the annular cavity with the plugging material, the amount of plugging material prepared can be accurately controlled, greatly reducing the amount of plugging material used and saving costs. Separating the plugging material and the plugging material solvent and mixing them after the drill string is lowered effectively avoids premature solidification of the plugging material, which could clog the drill string. This invention is simple, practical, easy to construct, safe, and reliable, possessing strong practicality.

[0023] The above-mentioned controllable interception leak-stopping tool can be further optimized and / or improved according to actual needs: As attached Figure 1As shown, the upper inner side of the upper connector 2 has a first stepped surface 32 that contacts the upper end of the first sliding sleeve 11; the upper outer side of the first connecting connector 3, located below the first sliding sleeve 11, has a second stepped surface 33; the inner side of the sleeve connector 5 has a third stepped surface 34 that contacts the upper end of the second sliding sleeve 15; and the upper outer side of the second connecting connector 6, located below the second sliding sleeve 15, has a fourth stepped surface 35. During use, the first stepped surface 32 and the second stepped surface 33 limit the movement of the first sliding sleeve 11, and the third stepped surface 34 and the fourth stepped surface 35 limit the movement of the second sliding sleeve 15.

[0024] As attached Figure 1 As shown, at least one first flow hole 36, communicating internally and externally, is distributed circumferentially on the lower outer side of the first connecting joint 3, corresponding to the position between the second step surface 33 and the lower part of the first sliding sleeve 11. At least one second flow hole 37, communicating internally and externally, is distributed circumferentially on the lower outer side of the sleeve joint 5, corresponding to the position below the fourth step surface 35 and the second sliding sleeve 15. During use, this arrangement can create a dead space when the first sliding sleeve 11 and the second sliding sleeve 15 move downwards, preventing the first connecting hole 14 and the second connecting hole 18 from being opened in time by the first sliding sleeve 11 and the second sliding sleeve 15, thus causing the leak-sealing operation to fail.

[0025] As attached Figure 1 As shown, the lower end of the guide shoe 31 has a crown-shaped support head 38. During use, this design prevents the lower end of the guide shoe 31 from piercing the bottom of the interception bag 1, which would hinder the injection of sealing material into the lost formation.

[0026] As attached Figure 1 As shown, the lower outer side of the tubing connector 29 is provided with several fixing annular grooves 39 spaced vertically. Depending on the requirements, the opening of the interceptor bag 1 can be sealed and fixed to the lower outer side of the tubing connector 29 by binding with multiple steel wires, or it can be sealed and fixed to the lower outer side of the tubing connector 29 by adhesive. During use, this design facilitates the sealing and fixing of the opening of the interceptor bag 1 to the lower outer side of the tubing connector 29.

[0027] Example 2: As shown in the attached document Figure 1 As shown, the leak sealing method includes the following steps: Step S1: First, fill the sealing material into the annular cavity formed by the upper end of the partition plate 26, the lower end of the pressure plate 22, the inner side of the second sleeve 7, and the outer side of the mixing pipe 21. Then, fill the sealing material solvent into the cavity formed by the lower end of the first cover plate 13, the upper end of the second cover plate 17, the inner side of the first connecting joint 3, the inner side of the first sleeve 4, and the inner side of the sleeve joint 5. Step S2: After the upper end of the upper connector 2 of the controllable interception plugging tool is connected to the drill string, the controllable interception plugging tool is lowered into the well to the position corresponding to the lost circulation zone through the drill string; Step S3: After adding packer fluid to the wellhead, turn on the mud pump and pump drilling fluid into the upper connector 2; Step S4: First pressurization, cut the first shear pin 12, the first sliding sleeve 11 moves downward to below the first connecting hole 14, and the drilling fluid enters the first casing 4 through the first connecting hole 14; Step S5: Second pressurization, cut the second shear pin 16, the second sliding sleeve 15 moves downward to below the second connecting hole 18, and the plugging material solvent is pushed into the second connecting joint 6 and the mixing pipe 21 by the drilling fluid; Step S6: Third pressurization, cut the third shear pin 27, the straight pipe joint 24 separates from the connecting pipe 23 and moves downward. Part of the sealant solvent passes through the diversion plate 19 and exerts pressure on the upper surface of the pressure plate 22, thereby pushing the sealant material downward. Another part of the sealant solvent passes through the mixing pipe 21 and is sprayed at the lower end of the connecting pipe 23 and mixed with the sealant material. At the same time, the partition plate 26 moves downward and contacts the guide shoe 31. Step S7: Fourth pressurization, cut the fourth shear pin 28, the guide shoe 31 and the connecting oil pipe 30 are separated, and the interception bag 1 is driven to extend out of the diameter-protecting joint 10; Step S8: The mixture of the sealing material and the sealing material solvent is filled into the interception bag 1 through the lower end of the connecting oil pipe 30; Step S9: Slowly lift the drill string according to the pumping flow rate of the mud pump, and continuously fill the interception bag 1 with the mixed plugging material, so that the interception bag 1 expands under force at the leakage location; Step S10: Stop the pump and wait for the mixed sealing material to solidify.

[0028] The first pressure can be 5 MPa. The second pressure can be the same as the first pressure or 5 MPa higher. The third pressure can be the same as the first pressure or 1 MPa higher. The fourth pressure can be the same as the first pressure or 1 MPa higher.

[0029] The above-mentioned leak-sealing methods can be further optimized and / or improved according to actual needs: Example 2: As shown in the attached document Figure 1 As shown, after step S10 is completed, the following steps are also included: Step S11: Raise the drill string and start pumping the mixed plugging agent directly at the wellhead.

[0030] Step S12: Stop the pump and observe the leak sealing effect; Step S13: Complete the leak sealing operation, remove the drill string, and wait for the subsequent drilling operation to continue.

[0031] Depending on the requirements, the plugging agent can be a mixture of plugging material and plugging material solvent, or it can be a known plugging agent. In step S11, the drill string is pulled up 10-20m. Since the intercepting bag 1 is fixed in the lost formation by the solidified plugging material, pulling up the drill string at this time will tear the intercepting bag 1 near the bag opening. Then the plugging agent is pumped, which can quickly plug the lost formation and improve the plugging effect.

[0032] As attached Figure 1 As shown, the sealing material in step S1 includes cement and dry powder, and the solvent for the sealing material includes water. The sealing material is based on existing, well-known technology, as required. This enhances the strength of the sealing material and its mixture, shortens the setting time, and improves the sealing effect.

[0033] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A leak-sealing method using a controllable interception leak-sealing tool, characterized in that... The controllable interception leak-stopping tool includes a bag-shaped interception bag and, from top to bottom, a top connector, a first connecting connector, a first sleeve, a sleeve connector, a second connecting connector, a second sleeve, a third connecting connector, a third sleeve, and a gauge-protecting connector, all fixed together in sequence. A first cover plate is fixed to the upper end of the first connecting connector. A plurality of first connecting holes, communicating internally and externally, are evenly distributed circumferentially on the outer side of the upper part of the first connecting connector corresponding to the position below the first cover plate. A first sliding sleeve is sealed between the outer side of the upper part of the first connecting connector corresponding to the position of the first connecting hole and the inner side of the lower part of the top connector. A plurality of first shear pins, with their ends fixed to the outer side of the first sliding sleeve, are distributed circumferentially on the lower part of the top connector. A second cover plate is fixed to the upper end of the second connecting connector. A plurality of second connecting holes, communicating internally and externally, are evenly distributed circumferentially on the outer side of the upper part of the second connecting connector corresponding to the position below the second cover plate. A second sliding sleeve is sealed between the outer side of the upper part of the second connecting connector corresponding to the position of the second connecting hole and the inner side of the lower part of the sleeve connector. A plurality of second shear pins, with their ends fixed to the outer side of the second sliding sleeve, are distributed circumferentially on the lower part of the sleeve connector. A flow divider plate is fixedly installed on the lower inner side of the connecting joint. Several vertically penetrating flow divider holes are evenly distributed at the upper end of the flow divider plate. A mixing tube, fitted inside the second sleeve, is fixedly installed in the center of the flow divider plate. A pressure plate is sealed between the upper outer side of the mixing tube and the inner side of the second sleeve, corresponding to the lower end of the second connecting joint. A connecting tube, fitted onto the upper inner side of the third connecting joint, is fixedly installed at the lower end of the mixing tube. A straight pipe joint is sealed on the lower outer side of the connecting tube. Several third pipe joints, with their ends fixed to the outer side of the connecting tube, are distributed circumferentially around the outer side of the straight pipe joint. The lower end of the shear pin and straight pipe joint is fixedly installed with an aluminum rod fitted inside the third connecting joint. The lower inner side of the third connecting joint is sealed and fixedly installed with an oil pipe joint. The upper inner side of the oil pipe joint is sealed and fitted with a partition plate fixedly installed together with the lower end of the aluminum rod. The lower outer side of the oil pipe joint and the bag opening of the interception bag are sealed and fixedly installed together. The lower inner side of the oil pipe joint is fixedly installed with a connecting oil pipe fitted inside the interception bag. The lower end of the connecting oil pipe is sealed and fitted with a guide shoe. Several fourth shear pins with their ends fixed to the outside of the connecting oil pipe are evenly distributed along the circumference on the outside of the guide shoe. The leak sealing method using a controllable interception leak sealing tool includes the following steps: Step S1: First, fill the sealing material into the annular cavity formed by the upper end of the partition plate, the lower end of the pressure plate, the inner side of the second sleeve and the outer side of the mixing pipe. Then, fill the sealing material solvent into the cavity formed by the lower end of the first cover plate, the upper end of the second cover plate, the inner side of the first connecting joint, the inner side of the first sleeve and the inner side of the sleeve joint. Step S2: After the upper end of the upper connector of the controllable interception plugging tool is connected to the drill string, the controllable interception plugging tool is lowered into the well to the position corresponding to the lost circulation zone through the drill string; Step S3: After adding packer fluid to the wellhead, turn on the mud pump and pump drilling fluid into the upper connector; Step S4: First pressurization, cut the first shear pin, the first sliding sleeve moves downward to below the first connecting hole, and the drilling fluid enters the first casing through the first connecting hole; Step S5: Second pressurization, cut the second shear pin, the second sliding sleeve moves downward to below the second connecting hole, and the plugging material solvent is pushed into the second connecting joint and mixing pipe by the drilling fluid; Step S6: Third pressurization, cut the third shear pin, the straight pipe joint separates from the connecting pipe and moves downward. Part of the sealant solvent passes through the diversion plate and generates pressure on the upper surface of the pressure plate, thereby pushing the sealant material downward. Another part of the sealant solvent passes through the mixing pipe and is sprayed at the lower end of the connecting pipe and mixed with the sealant material. At the same time, the partition plate moves downward and contacts the guide shoe. Step S7: Fourth pressurization, cut the fourth shear pin, the guide shoe and the connecting oil pipe are separated, and the interception bag is pulled out from the diameter protection joint; Step S8: The mixture of the plugging material and the plugging material solvent is filled into the interception bag through the lower end of the connecting oil pipe; Step S9: Slowly lift the drill string according to the pumping flow rate of the mud pump, and continuously fill the interception bag with the mixed plugging material, so that the interception bag expands under pressure at the leakage location; Step S10: Stop the pump and wait for the mixed sealing material to solidify; In step S1, the sealing materials include cement and dry powder, and the solvent for the sealing materials includes water.

2. The leak-sealing method using a controllable interception leak-sealing tool according to claim 1, characterized in that... The upper inner side of the upper connector has a first stepped surface that contacts the upper end of the first sliding sleeve, the upper outer side of the first connecting connector corresponding to the position below the first sliding sleeve has a second stepped surface, the inner side of the sleeve connector has a third stepped surface that contacts the upper end of the second sliding sleeve, and the upper outer side of the second connecting connector corresponding to the position below the second sliding sleeve has a fourth stepped surface.

3. The leak-sealing method using a controllable interception leak-sealing tool according to claim 2, characterized in that... At least one first flow hole with internal and external communication is distributed circumferentially on the lower outer side of the first connecting joint corresponding to the position between the second step surface and the lower part of the first sliding sleeve. At least one second flow hole with internal and external communication is distributed circumferentially on the lower outer side of the sleeve joint corresponding to the position between the fourth step surface and the lower part of the second sliding sleeve.

4. The leak-sealing method using a controllable interception leak-sealing tool according to claim 1, 2, or 3, characterized in that... The lower part of the shoe has a support head shaped like a spherical crown.

5. The leak-sealing method using a controllable interception leak-sealing tool according to claim 1, 2, or 3, characterized in that... The lower outer side of the oil pipe joint is provided with several fixed ring grooves spaced vertically.

6. The leak-sealing method using a controllable interception leak-sealing tool according to claim 4, characterized in that... The lower outer side of the oil pipe joint is provided with several fixed ring grooves spaced vertically.

7. The leak-sealing method using a controllable interception leak-sealing tool according to claim 1, characterized in that... After step S10 is completed, the following steps are also included: Step S11: Raise the drill string and start pumping the mixed plugging agent directly at the wellhead; Step S12: Stop the pump and observe the leak sealing effect; Step S13: Complete the leak sealing operation, remove the drill string, and wait for the subsequent drilling operation to continue.

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