Double-hydraulic-drive drilling multifunctional tool capable of achieving continuous leaking stoppage and method

Abstract

The tool comprises an outer pipe, a throttling sleeve, a touch rod, a driving sleeve and a drill bit, a plurality of cutter blocks are arranged in the side wall of the lower portion of the outer pipe, the throttling sleeve is arranged in the outer pipe and can move up and down, the touch rod is connected to the bottom of the throttling sleeve, and the driving sleeve is arranged in the outer pipe. A plurality of pushing blocks are arranged on the outer wall of the driving sleeve in the circumferential direction at intervals. The throttling sleeve can move downwards by a preset distance when the displacement of liquid injected into the throttling sleeve reaches a preset value, and drives the touch rod to move downwards to be inserted into the driving sleeve to generate throttling, so that the liquid pushes the driving sleeve to move downwards to a preset position, the push block pushes the corresponding cutter block outwards, and the cutter block is opened outwards. According to the tool and the method, an existing polished drill rod can be replaced for cement injection for leaking stoppage, a roller bit can also be replaced for cement plug drilling, continuous multiple cement leaking stoppage operation without pulling out of a hole is achieved, meanwhile, after plug drilling is completed, the normal drilling capacity is achieved, the number of times of pulling out of the hole is reduced, and the leaking stoppage operation period is greatly shortened.

Description

Technical Field

[0001] The invention relates to the field of oil drilling, and in particular to a dual-hydraulic continuous leak plugging drilling multifunctional tool and method. Background Art

[0002] During drilling operations, well leakage seriously restricts the drilling speed. Various complex situations are directly related to well leakage and cause huge economic losses. The treatment of well leakage is related to the exploration and development process, which has always been a special concern of the petroleum engineering community. Due to the complex causes of leakage and many restrictive factors, it has become a technical problem faced by drilling and completion projects. Cement plugging is the main plugging method when the well leakage is serious. Due to the complex downhole conditions, it cannot be guaranteed to be successful in one time, and multiple and repeated plugging may be required in the same leakage layer. In order to achieve the requirements of large-volume rapid cement slurry injection and avoid safety accidents caused by the tool being cemented at the bottom of the well, at present, conventional plugging is to plug the leak with cement through the bare drill pipe, then replace the roller drill bit to drill the cement plug, and then check whether the plugging is successful. If not, repeat the above operation procedures until the plugging is successful. After the plugging is successful, it is necessary to pull out the drill and replace the drill bit assembly to continue drilling. However, although this method of plugging leaks has a good plugging effect, it may require multiple and repeated plugging in the same leaking layer, and the drilling must be frequently tripped and lowered, which complicates the overall process. It not only increases the risk of downhole operations, but also seriously delays the drilling cycle, which is particularly evident in deep wells and ultra-deep wells.

[0003] Therefore, the inventor, relying on many years of experience and practice in related industries, proposes a dual-hydraulic continuous plugging drilling multifunctional tool and method to overcome the defects of the prior art. Summary of the invention

[0004] The purpose of the present invention is to provide a dual-hydraulic continuous plugging drilling multifunctional tool and method, which can replace the existing bare drill rod cement injection plugging, and replace the roller drill bit to drill cement plugs, to achieve continuous multiple cement plugging operations without drilling, and at the same time, it still has normal drilling ability after the drilling and plugging are completed, reducing the number of drilling and drilling, and greatly shortening the plugging operation cycle.

[0005] The above-mentioned purpose of the present invention can be achieved by adopting the following technical solutions:

[0006] The present invention provides a dual-hydraulic continuous leak plugging and drilling multifunctional tool, comprising:

[0007] A vertically arranged outer tube has a lower side wall with a plurality of knife blocks which can be opened outwards and arranged at intervals in the circumferential direction;

[0008] A throttling sleeve, which is movable up and down and is arranged inside the outer tube;

[0009] A trigger rod connected to the bottom of the throttle sleeve;

[0010] A driving sleeve is disposed in the outer tube and below the trigger rod so as to be movable up and down, and a plurality of push blocks are disposed at intervals in the circumferential direction on the outer wall of the driving sleeve;

[0011] a drill bit connected to the bottom end of the outer tube;

[0012] Among them, the throttling sleeve can move downward a preset distance when the displacement of the liquid injected therein reaches a preset value, and drive the trigger rod to move downward and insert into the driving sleeve to generate throttling, so that the liquid pushes the driving sleeve to move downward to a preset position, and the push block pushes the corresponding knife block outward, and the knife block opens outward; the throttling sleeve and the driving sleeve can move upward and reset after the liquid stops being injected, and the knife block can be retracted inward to the side wall of the outer tube.

[0013] In a preferred embodiment of the present invention, the throttling sleeve is a cylindrical structure with an opening at the upper end and a plurality of throttling holes on the lower end face, and an upper limit ring and a lower limit ring are respectively provided on the outer walls at both ends; a stop ring and a stop portion are arranged at intervals up and down on the inner wall of the outer tube, and the upper limit ring and the lower limit ring are respectively located on both sides of the stop ring; an upper reset spring is provided on the outer wall of the throttling sleeve, and the two ends of the upper reset spring are respectively pressed between the upper limit ring and the stop ring; the lower limit ring can move downward to press against the stop portion when the liquid displacement reaches a preset value, and can press against the stop ring after the throttling sleeve is reset.

[0014] In a preferred embodiment of the present invention, a support ring is formed on the lower inner wall of the outer tube, a plurality of arc blocks are circumferentially spaced on the support ring, a plurality of limit plates are circumferentially spaced on the outer wall of the lower end of the driving sleeve, and a lower return spring is sleeved on the outer circumference of the plurality of arc blocks; each limit plate can be inserted between two corresponding adjacent arc blocks so as to be movable up and down, and the two ends of the lower return spring respectively press against the limit plate and the support ring.

[0015] In a preferred embodiment of the present invention, a sliding groove is provided on the inner side of the blade block, and the sliding groove includes an inclined groove and a flat groove connected up and down, the bottom groove wall of the inclined groove is an inner inclined surface, and the groove wall of the flat groove is a plane; the lower outer wall of the push block is an outer inclined surface, and its upper outer wall is a vertical plane, the shape of the inclined groove matches the shape of the push block, and when the driving sleeve moves downward to a preset position, the push block can be inserted into the flat groove and the vertical plane is in contact with the groove wall of the flat groove.

[0016] In a preferred embodiment of the present invention, a plurality of mounting openings are circumferentially provided on the outer wall of the outer tube, and the upper end of each blade block is connected to the outer tube via a rotating shaft, and the axial direction of the rotating shaft is perpendicular to the axial direction of the outer tube; an inner bevel is provided on the inner wall of the outer tube and adjacent to the lower position of the mounting opening, and an outer bevel is provided on the lower end surface of the blade block, and the outer bevel can abut against the inner bevel after the blade block is opened outward.

[0017] In a preferred embodiment of the present invention, a locking push rod that can elastically move up and down and a locking top rod that can elastically move radially are provided in the side wall of the outer tube, the upper end of the locking push rod can extend upward from the stop portion, the lower end of the locking push rod has an upper inclined surface, the locking top rod is located below the locking push rod and has a lower inclined surface that can cooperate with the upper inclined surface, and the upper inclined surface can abut against the lower inclined surface; a locking limit hole is provided on the outer wall of the driving sleeve, and the lower limit ring can push the locking push rod to move downward when it moves downward and abuts against the stop portion, so that the locking top rod is inserted into the locking limit hole when the driving sleeve moves down to a preset position.

[0018] In a preferred embodiment of the present invention, an axial mounting hole and a radial mounting hole are opened in the side wall of the outer tube, the upper end of the axial mounting hole penetrates the stopper upward, and the radial mounting hole is connected to the lower end of the axial mounting hole and radially penetrates the inner wall of the outer tube; a stepped hole with an increased aperture is formed at the first end of the axial mounting hole, a plug is installed in the end of the stepped hole, the upper end of the locking push rod can move up and down through the plug, the upper outer wall of the locking push rod has a first annular flange, the first flange is located below the plug, and the locking push rod outer sleeve is provided with a locking return spring , the two ends of the locking return spring respectively press against the first flange and the bottom hole shoulder of the stepped hole; a mounting sleeve is provided in the radial mounting hole, the locking push rod comprises a push column and a locking pin arranged in the mounting sleeve, a lower inclined surface is formed on the push column, and the lower end of the locking push rod can extend into the mounting sleeve and press against the lower inclined surface; an annular second flange is provided on the upper outer wall of the push column, a first spring is sandwiched between the second flange and the step in the mounting sleeve, a second spring is provided between the push column and the locking pin, and the locking pin can extend radially inward and be inserted in the locking limit hole.

[0019] In a preferred embodiment of the present invention, the lower end of the trigger rod is connected to a trigger head, the diameter of the trigger head is larger than the diameter of the trigger rod, and the trigger head can move into the driving sleeve when the throttling sleeve moves downward.

[0020] In a preferred embodiment of the present invention, a convex ring with a reduced inner diameter is protruded inwardly on the inner wall of the upper end of the driving sleeve; the trigger head can be located in the driving sleeve below the convex ring when the throttling sleeve moves down to a preset distance, and can be located in the convex ring when the driving sleeve moves downward to a preset position.

[0021] In a preferred embodiment of the present invention, an annular chute with a closed upper end and an open lower end is formed in the upper portion of the outer tube, and the upper portion of the throttling sleeve is inserted in the annular chute so as to be movable up and down.

[0022] In a preferred embodiment of the present invention, the upper end of the driving sleeve is connected to a connecting sleeve, and a limiting block is connected to the upper end of the connecting sleeve. A center hole and a plurality of flow holes are formed on the limiting block. The diameter of the trigger head is larger than the aperture of the center hole. The trigger rod can move through the center hole, and the trigger head is located below the limiting block. A bursting disc is installed on the side wall of the throttling sleeve, and a ball seat that can be used to support the throttling ball is formed on the lower inner wall of the throttling sleeve.

[0023] In a preferred embodiment of the present invention, a one-way valve and a pressure relief valve are arranged on the side wall of the outer tube at intervals, the pressure relief valve is arranged directly in the annular space between the outer tube and the throttling sleeve, and the one-way valve is located above the upper limit ring.

[0024] In a preferred embodiment of the present invention, a plurality of nozzle holes are provided in the lower end of the drill bit, the nozzle holes can communicate with the inner cavity of the drive sleeve and the outer wall of the lower end of the drill bit, and the equivalent diameter of the nozzle holes is greater than or equal to 30 mm.

[0025] In a preferred embodiment of the present invention, the outer tube includes an upper joint, a trigger short section, an outer tube and a lower joint connected in sequence from top to bottom, the cutter block is arranged on the outer tube, the throttling sleeve is located in the upper joint, the trigger rod is located in the trigger short section, the driving sleeve is arranged in the outer tube, and the drill bit is connected to the bottom end of the lower joint.

[0026] The present invention also provides a double hydraulic continuous plugging drilling method, which comprises:

[0027] Connect the drill pipe and the above-mentioned dual hydraulic continuous plugging drilling multifunctional tool to form a drilling tool assembly, and lower the dual hydraulic continuous plugging drilling multifunctional tool to the plugging target layer;

[0028] Start grouting construction. After the cement slurry is injected, start the pump to inject drilling fluid to replace the cement slurry in the drill bit assembly. After the cement slurry replacement operation is completed, pull the drill to a safe position;

[0029] After the cement slurry is solidified, the double hydraulic continuous plugging drilling multifunctional tool is put into the drill again, the pump is turned on to increase the displacement to the preset value, the lower end of the trigger rod enters the drive sleeve to produce throttling, and the hydraulic thrust generated pushes the drive sleeve downward to the preset position, the push block pushes the knife block outward to open, and the drilling and plugging construction begins;

[0030] After the plugging is completed, the drill is pulled out from the bottom of the well, drilling fluid is injected, the well is sealed and the pressure is held down to check whether the plugging is successful;

[0031] If the plugging is unsuccessful, repeat the grouting and drilling until the plugging is successful;

[0032] Carry out drilling operations.

[0033] As described above, in the tool and method of the present invention, during the grouting process, when the liquid displacement is less than the preset value, the throttling sleeve will not move downward, and the tool interior has a larger equivalent diameter to ensure large-displacement grouting; during the drilling process, when the liquid displacement reaches the preset value, the throttling sleeve is first pushed downward with the trigger rod into the driving sleeve, so that a throttling effect is generated in the driving sleeve, and the throttling force then pushes the driving sleeve downward to push the knife block to open outward, and the knife block is pushed out in the form of "double hydraulic". The opening of the knife block is controlled by the displacement, and the knife block will not be triggered by mistake below the critical displacement. When the knife block needs to be extended, it only needs to increase the displacement above the critical displacement, so as to realize the switching between the grouting condition and the drilling condition. Utilizing the difference between the displacement of cement slurry for injection and the displacement of drilling fluid for plugging, the switching between the grouting condition and the drilling condition can be controlled by controlling the liquid displacement, which has better operability, will not cause the cutter block to open prematurely during construction, and makes construction safer. It realizes multiple cement plugging and drilling operations without starting the drill, which can greatly simplify the plugging-drilling operation process. At the same time, after the cement drilling and plugging is completed, it can continue to drill into new formations with normal drilling capabilities, further reducing the number of drilling times, which not only greatly shortens the plugging operation cycle, but also improves the drilling operation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The following drawings are only intended to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0035] in:

[0036] Figure 1 : A schematic diagram of the dual-hydraulic continuous leak plugging drilling multifunctional tool provided by the present invention in a grouting condition.

[0037] Figure 2 : A schematic diagram of the dual-hydraulic continuous leak plugging drilling multifunctional tool provided by the present invention after the touch head extends into the driving sleeve.

[0038] Figure 3 : A schematic diagram of the dual-hydraulic continuous plugging drilling multifunctional tool provided by the present invention in the drilling and plugging working condition.

[0039] Figure 4 : A schematic diagram of the throttling hole at the bottom of the throttling sleeve provided by the present invention.

[0040] Figure 5 : Schematic diagram of the lower joint provided by the present invention.

[0041] Figure 6 : A schematic diagram of the cooperation between the lower joint and the driving sleeve provided by the present invention.

[0042] Figure 7 :for Figure 6 sectional view of .

[0043] Figure 8: A three-dimensional diagram of the drive sleeve and the connecting sleeve provided by the present invention.

[0044] Fig. 9 : A partial cross-sectional view of the drive sleeve and the connecting sleeve provided by the present invention.

[0045] Fig.10 : A schematic diagram of a knife block provided by the present invention.

[0046] Fig.11 : An enlarged view of the locking mechanism provided by the present invention.

[0047] Fig.12 : A schematic diagram of the cooperation between the mounting sleeve, the top column and the locking pin in the locking mechanism provided by the present invention.

[0048] Fig.13 : A three-dimensional diagram of the cooperation between the mounting sleeve, the top column and the locking pin in the locking mechanism provided by the present invention.

[0049] Fig.14 : A schematic diagram of the dual-hydraulic continuous plugging and drilling multifunctional tool provided by the present invention after the ball is thrown to cut off the fluid during the forced recovery process.

[0050] Fig.15 : A schematic diagram of the throttling sleeve of the dual-hydraulic continuous leak plugging drilling multifunctional tool provided by the present invention moving upward to an initial state during the process of forced recovery by ball throwing.

[0051] Fig.16 : Schematic diagram of the drill bit provided by the present invention Figure 1 .

[0052] Fig.17 : Schematic diagram of the drill bit provided by the present invention Figure 2 .

[0053] Description of Figure Numbers:

[0054] 1. External management;

[0055] 11. Upper joint; 111. Annular slide; 112. One-way valve; 113. Pressure relief valve;

[0056] 12. Trigger nipple; 121. Stop ring;

[0057] 13, outer cylinder; 131, stopper; 132, mounting opening; 133, knife seat; 1331, rotating shaft; 134, inner bevel; 135, axial mounting hole;

[0058] 14. lower joint; 141. support ring; 142. arc block; 143. lower return spring;

[0059] 2. Throttle sleeve; 21. Throttle hole; 22. Upper limit ring; 23. Lower limit ring; 24. Upper return spring; 25. Bursting disc; 26. Ball seat; 27. Throttle ball;

[0060] 3. Trigger rod; 32. Trigger head;

[0061] 4. driving sleeve; 41. pushing block; 411. outer inclined surface; 412. vertical plane; 42. limiting plate; 43. locking limiting hole; 44. convex ring;

[0062] 5. Connecting sleeve; 51. Limiting block; 511. Flow hole;

[0063] 6. Knife block; 61. Chute; 611. Inclined groove; 6111. Inner inclined surface; 612. Flat groove; 613. External inclined surface;

[0064] 7. Locking mechanism; 71. Locking push rod; 711. First flange; 712. Locking return spring; 72. Plug; 73. Mounting sleeve; 731. First stepped hole; 732. Second stepped hole; 733. Opening hole; 74. Top column; 741. Second flange; 75. First spring; 76. Second spring; 77. Locking pin; 78. Block;

[0065] 8. Drill bit; 81. Threaded pipe section; 82. Connecting pipe section; 83. End section; 831. Nozzle hole; 84. Blade; 85. Chip groove; 86. Front row of teeth; 87. Rear row of teeth;

[0066] 9. Bottom of the well. DETAILED DESCRIPTION

[0067] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0068] like Figures 1 to 17 As shown, the present application provides a dual hydraulic continuous plugging and drilling multifunctional tool, comprising:

[0069] The vertically arranged outer tube 1 has a plurality of knife blocks 6 which can be opened outwards and are arranged at intervals in the inner circumferential direction of the lower side wall;

[0070] A throttling sleeve 2 is disposed in the outer tube 1 and can move up and down;

[0071] A trigger rod 3 connected to the bottom of the throttling sleeve 2;

[0072] A driving sleeve 4 is disposed in the outer tube 1 and below the trigger rod 3 so as to be movable up and down. A plurality of push blocks 41 are provided at intervals along the circumference of the outer wall of the driving sleeve 4.

[0073] a drill bit 8 connected to the bottom end of the outer tube 1;

[0074] Among them, the throttling sleeve 2 can move downward by a preset distance when the displacement of the liquid injected therein reaches a preset value, and drive the trigger rod 3 to move downward and insert into the driving sleeve 4 to generate throttling, so that the liquid pushes the driving sleeve 4 to move downward to a preset position, and the push block 41 pushes the corresponding knife block 6 outward, and the knife block 6 opens outward; the throttling sleeve 2 and the driving sleeve 4 can move upward and reset after the liquid stops being injected, and the knife block 6 is retracted inward to the side wall of the outer tube 1.

[0075] Specifically, the throttle sleeve 2 remains in the initial state when the displacement of the liquid is less than the preset value, and will move downward only when the displacement of the liquid reaches the preset value. Each blade block 6 is located in the side wall of the outer tube 1 in the initial state, and the number of push blocks 41 is the same as the number of blade blocks 6. For example, in this embodiment, the number of push blocks 41 and blade blocks 6 is three and they are evenly spaced in the circumferential direction. The drill bit 8 has a nozzle hole 831, and the upper port of the outer tube 1 is connected with the inner cavity of the throttle sleeve 2, the inner cavity of the drive sleeve 4 and the nozzle hole 831 on the drill bit 8, and forms a liquid circulation channel for liquid (cement slurry or drilling fluid) to flow through.

[0076] When in use, after the tool is lowered into the well leakage position, cement slurry is injected into the liquid circulation channel, and the cement slurry flows out through the upper port of the outer tube 1, the throttling sleeve 2, the driving sleeve 4 and the nozzle hole 831 in sequence; under this grouting condition, the displacement of the liquid is less than the above-mentioned preset value, the throttling sleeve 2 remains stationary, and the trigger rod 3 will not enter the driving sleeve 4 to produce throttling. At this time, the tool will have a sufficiently large equivalent diameter from top to bottom to complete the smooth injection of cement slurry. Figure 1 When it is necessary to switch from the grouting condition to the drilling condition, the pump is turned on to inject drilling fluid to replace the cement slurry in the drill tool. After the cement slurry is replaced, the displacement is increased to the preset value, and the throttling sleeve 2 moves down with the trigger rod 3, and the trigger rod 3 enters the driving sleeve 4. At this time, the equivalent diameter of the driving sleeve 4 is reduced, as shown in FIG. Figure 2 As shown, throttling will occur, and the throttling force pushes the driving sleeve 4 downward, and each push block 41 on the driving sleeve 4 will push each blade block 6 to open outward, so that the outer diameter of each blade block 6 expands to a full-eye size to form a drilling plug working condition, such as Figure 3 As shown; drilling operations can be performed by driving the entire tool to rotate.

[0077] When the plugging is completed, the displacement is stopped (the injection of liquid is stopped), the throttling sleeve 2 and the driving sleeve 4 will move up and reset, and the cutter block 6 will also be retracted. After that, the tool is lifted up a certain distance to perform a well sealing and pressure test. If the well leakage still exists, the plugging and drilling operations are repeated until the pressure test meets the requirements. After the plugging is successful, the drilling fluid displacement is increased again, so that the cutter block 6 opens outward, and normal drilling can continue.

[0078] Therefore, according to the tool of the present application, during the grouting process, when the liquid displacement is less than the preset value, the throttling sleeve 2 will not move downward, and the tool has a larger equivalent diameter inside to ensure large-displacement grouting; during the drilling process, when the liquid displacement reaches the preset value, the throttling sleeve 2 is first pushed downward with the trigger rod 3 into the driving sleeve 4, so that a throttling effect is generated in the driving sleeve 4, and the throttling force then pushes the driving sleeve 4 downward to push the knife block 6 to open outward, and the knife block 6 is pushed out in the form of "double hydraulic". The opening of the knife block 6 is controlled by the displacement. Below the critical displacement, the knife block 6 will not be triggered by mistake. When the knife block 6 needs to be extended, it only needs to increase the displacement above the critical displacement, so as to realize the switching between the grouting condition and the drilling condition. By utilizing the difference between the displacement of cement slurry for injection and the displacement of drilling fluid for plugging, the switching between the grouting condition and the drilling condition can be controlled by controlling the liquid displacement, which has better operability, will not cause the cutter block 6 to open prematurely during the construction process, and the construction is safer; it realizes multiple cement plugging and drilling operations without starting the drill, which can greatly simplify the plugging-drilling operation process, and at the same time, after the cement drilling and plugging is completed, it can continue to drill into the new formation, have normal drilling ability, further reduce the number of drilling and pulling out, not only greatly shorten the plugging operation cycle, but also improve the drilling operation efficiency.

[0079] In the specific implementation, refer to Figure 1 The throttling sleeve 2 is a cylindrical structure with an open upper end and a plurality of throttling holes 21 on the lower end face, and an upper limit ring 22 and a lower limit ring 23 are respectively provided on the outer walls at both ends; a stop ring 121 and a stop portion 131 are arranged at intervals up and down on the inner wall of the outer tube 1, and the upper limit ring 22 and the lower limit ring 23 are respectively located on both sides of the stop ring 121; an upper return spring 24 is provided on the outer wall of the throttling sleeve 2, and the two ends of the upper return spring 24 are respectively pressed between the upper limit ring 22 and the stop ring 121; the lower limit ring 23 can move downward to press against the stop portion 131 when the liquid displacement reaches a preset value, and can press against the stop ring 121 after the throttling sleeve 2 is reset.

[0080] A central hole is provided at the bottom center of the throttle sleeve 2, and the upper end of the trigger rod 3 can be inserted into the central hole and threadedly connected. A plurality of throttle holes 21 are located around the central hole, and their shapes can be as follows: Figure 4 The waist-shaped hole shown in the figure can generate a throttling when the liquid flows through, so as to better push the throttling sleeve 2 to move under a smaller displacement. The size and number of the specific throttling holes 21 are determined according to the needs to ensure that the lower part of the throttling sleeve 2 has a sufficient equivalent diameter.

[0081] In practical applications, a large force is generally required to push the driving sleeve 4. In order to make the throttling force generated during the secondary throttling larger, the lower end of the trigger rod 3 is connected (for example, threadedly connected) with a trigger head 32. The diameter of the trigger head 32 is larger than the diameter of the trigger rod 3. The trigger head 32 can move into the driving sleeve 4 when the throttling sleeve 2 moves downward. In this embodiment, the diameter of the trigger head 32 is close to the inner diameter of the driving sleeve 4 to generate sufficient throttling force.

[0082] The upper return spring 24 should be reasonably selected during design so that the throttling force generated by the lower end of the throttling sleeve 2 during grouting is smaller than the resistance of the upper return spring 24. The strength of the upper return spring 24 can withstand the throttling force generated by the grouting displacement, and cannot drive the throttling sleeve 2 to produce relative displacement, and the trigger head 32 will not move into the driving sleeve 4 to produce secondary throttling, which can ensure that the equivalent diameter of the flow channel inside the tool meets the grouting requirements; when it is necessary to switch to the drill plug, increase the displacement to the preset value, the throttling sleeve 2 will generate a throttling force greater than the upper return spring 24, and the hydraulic thrust generated by the throttling sleeve 2 compresses the upper return spring 24, pushing the entire throttling sleeve 2 and driving the trigger rod 3 and the trigger head 32 downward, and the trigger head 32 moves into the driving sleeve 4. At this time, the equivalent diameter of the driving sleeve 4 is sharply reduced (such as Figure 2 As shown in the figure, secondary throttling will occur, pushing the driving sleeve 4 to move and push out the cutter block 6. At this time, the cutter block 6 and the drill bit 8 can complete the drilling operation of the full eye size. When the drilling is completed and the displacement is stopped, the throttling sleeve 2 is reset under the push of the upper return spring 24.

[0083] In order to facilitate the reset of the drive sleeve 4, a support ring 141 can be formed on the lower inner wall of the outer tube 1, and a lower reset spring 143 is sandwiched between the bottom end of the drive sleeve 4 and the support ring 141. When the drilling is completed and the displacement is stopped, the drive sleeve 4 is reset under the push of the lower reset spring 143, and at the same time, the push block 41 of the drive sleeve 4 drives the knife block 6 back to its original position.

[0084] In a preferred embodiment, referring to Figures 5 to 8 A support ring 141 is formed on the inner wall of the lower part of the outer tube 1, and a plurality of arc blocks 142 are circumferentially spaced on the support ring 141. A plurality of limit plates 42 are circumferentially spaced on the outer wall of the lower end of the driving sleeve 4, and a lower return spring 143 is sleeved on the outer periphery of the plurality of arc blocks 142; each limit plate 42 is inserted between two corresponding adjacent arc blocks 142 so as to be movable up and down, and the two ends of the lower return spring 143 are respectively pressed against the limit plate 42 and the support ring 141.

[0085] It can be understood that the number of arc blocks 142 should be one more than the number of limit plates 42. For example, in this embodiment, there are four arc blocks 142 and three limit plates 42. The arc blocks 142 limit the limit plates 42 circumferentially, so as to prevent the driving sleeve 4 from rotating circumferentially in the outer tube 1, and the structure is more stable.

[0086] Further, see Fig. 9 and Fig.10 A slide groove 61 is provided on the inner side of the blade block 6, and the slide groove 61 includes an inclined groove 611 and a flat groove 612 connected up and down. The bottom groove wall of the inclined groove 611 is an inner inclined surface 6111, and the groove wall of the flat groove 612 is a plane; the lower outer wall of the push block 41 is an outer inclined surface 411, and its upper outer wall is a vertical plane 412. The shape of the inclined groove 611 matches the shape of the push block 41. When the driving sleeve 4 moves downward to the preset position, the push block 41 can be inserted into the flat groove 612 and the vertical plane 412 fits with the groove wall of the flat groove 612.

[0087] The longitudinal section of the inclined groove 611 along the axial direction of the outer tube 1 is a right-angled trapezoid, and the longitudinal section of the push block 41 along the axial direction of the outer tube 1 is also a right-angled trapezoid. The shapes of the two are matched, and the hypotenuse of the right-angled trapezoid faces downward. In the initial state, the knife block 6 is located in the side wall of the outer tube 1, and the push block 41 is inserted in the inclined groove 611 of the knife block 6. The knife block 6 is provided with a slide groove 61, which cooperates with the push block 41 of the drive sleeve 4 to ensure that the knife block 6 slides along the push block 41, and at the same time ensures that the drive sleeve 4 will not rotate randomly inside the tool; the slide groove 61 of the knife block 6 is in the shape of a slope-plane, with the slope as a guide and the plane as a limit, which ensures that the knife block 6 will not be compressed and retracted due to external force after opening, and the structure is more stable.

[0088] Reference Figure 1 and Fig.10 A plurality of mounting openings 132 are circumferentially provided on the outer wall of the outer tube 1, and the upper end of each blade block 6 is connected to the outer tube 1 via a rotating shaft 1331, and the axial direction of the rotating shaft 1331 is perpendicular to the axial direction of the outer tube 1; an inner bevel 134 is provided on the inner wall of the outer tube 1 and adjacent to the lower position of the mounting opening 132, and an outer bevel 613 is provided on the lower end surface of the blade block 6, and the outer bevel 613 can abut against the inner bevel 134 after the blade block 6 is opened outward.

[0089] Generally, a knife seat 133 is installed at the upper end of the installation opening 132. The knife seat 133 is connected to the outer tube 1 through a fastener, and the upper end of the knife block 6 is connected to the knife seat 133 through a rotating shaft 1331, which makes processing and installation more convenient. A U-shaped groove is provided on the lower end surface of the knife seat 133, so that the knife seat 133 and the arc-shaped connecting block at the upper end of the knife block 6 are in close contact (the arc-shaped connecting block is provided with a mounting hole for installing the rotating shaft 1331). When drilling plugs, the axial force of the knife block 6 can directly act on the knife seat 133, avoiding damage to the rotating shaft 1331 by force, and improving the service life of the knife block 6. The above-mentioned inner bevel 134 limits the position of the knife block 6 to open outward, ensuring that the knife block 6 will not continue to expand after opening to a specified size.

[0090] Furthermore, a locking mechanism 7 is provided inside the outer tube 1, and its function is to limit and lock the cutter block 6 when it is extended to a specified wellbore size under the drilling and plugging condition. The details are as follows:

[0091] A locking push rod 71 that can elastically move up and down and a locking push rod that can elastically move radially are provided in the side wall of the outer tube 1. The upper end of the locking push rod 71 can extend upwardly from the stop portion 131, and the lower end of the locking push rod 71 has an upper inclined surface. The locking push rod is located below the locking push rod 71 and has a lower inclined surface that can cooperate with the upper inclined surface, and the upper inclined surface can abut against the lower inclined surface; a locking limit hole 43 is provided on the outer wall of the driving sleeve 4, and when the lower limit ring 23 moves downward and abuts against the stop portion 131, it can push the locking push rod 71 to move downward, so that the locking push rod is inserted into the locking limit hole 43 when the driving sleeve 4 moves down to a preset position.

[0092] More specifically, the structure and installation of the locking push rod 71 and the locking push rod can be achieved as follows: Figure 1 as well as Figures 11 to 13 An axial mounting hole 135 and a radial mounting hole are provided in the side wall of the outer tube 1. The upper end of the axial mounting hole 135 penetrates the stopper 131 upward, and the radial mounting hole is connected to the lower end of the axial mounting hole 135 and radially penetrates the inner wall of the outer tube 1. A stepped hole with an increased aperture is formed at the first end of the axial mounting hole 135. A plug 72 is installed in the end of the stepped hole. The upper end of the locking push rod 71 can move up and down through the plug 72. The upper outer wall of the locking push rod 71 has an annular first flange 711. The first flange 711 is located below the plug 72. A locking reset spring 712 is provided on the outer sleeve of the locking push rod 71. The two ends of the locking reset spring 712 respectively press against the first flange 711 and the bottom hole shoulder of the stepped hole.

[0093] A mounting sleeve 73 is provided in the radial mounting hole, and the locking push rod includes a push column 74 and a locking pin 77 arranged in the mounting sleeve 73. A lower inclined surface is formed on the push column 74, and the lower end of the locking push rod 71 can extend into the mounting sleeve 73 and abut against the lower inclined surface (an opening 733 is provided on the side wall of the mounting sleeve 73 for the locking push rod 71 to extend into); an annular second flange 741 is provided on the upper outer wall of the push column 74, and a first spring 75 is sandwiched between the second flange 741 and the step in the mounting sleeve 73, and a second spring 76 is provided between the push column 74 and the locking pin 77, and the locking pin 77 can extend radially inward and be inserted in the locking limit hole 43.

[0094] The center of the plug 72 has an opening to facilitate the locking push rod 71 to pass through. The inner hole of the mounting sleeve 73 includes a first step hole 731 and a second step hole 732 that are connected to each other. The diameter of the second step hole 732 is larger than the diameter of the first step hole 731, and the diameter of the first step hole 731 is larger than the diameter of the top column 74. The locking pin 77 and the second spring 76 are located in the first step hole 731, the top column 74 is located in the second step hole 732 and its lower end extends into the first step hole 731, the two ends of the first spring 75 are respectively pressed against the second flange 741 and the shoulder of the second step hole 732 (i.e., the step in the mounting sleeve 73), and the two ends of the second spring 76 are generally fixed between the top column 74 and the locking pin 77. In order to facilitate installation, the radial installation hole also radially penetrates the outer wall of the outer tube 1. After installing all the components, a block 78 is installed (threaded) in the radial installation hole near the outer wall of the outer tube 1 to isolate the external liquid. A limiting step is provided on the inner wall of the inner side of the radial installation hole, and the middle outer wall of the installation sleeve 73 has a corresponding step and abuts against the limiting step. The inner end face of the block 78 is pressed on the outer end face of the installation sleeve 73 to position the installation sleeve 73.

[0095] Of course, in order to play a better guiding role, the inner end portion of the first stepped hole 731 can also form a stepped hole with a reduced aperture, and the locking pin 77 is located in the stepped hole.

[0096] During use, when the throttle sleeve 2 moves downward until the lower limit ring 23 abuts against the stopper 131, the lower limit ring 23 pushes the locking push rod 71 to move downward, and through the action of the upper and lower inclined surfaces, pushes the top column 74 to move radially inward, and pushes the locking pin 77 to move inward; due to the existence of the second spring 76, before the drive sleeve 4 moves downward to the preset position, that is, before the locking limit hole 43 is in place, the end of the locking pin 77 will not jam the drive sleeve 4. When the locking limit hole 43 moves to the position, the locking pin 77 is inserted into the locking limit hole 43 under the action of the second spring 76 to lock and limit the drive sleeve 4, preventing the sudden change in drilling fluid displacement from causing the cutter block 6 to retract and shrink, and finally preventing the cutter block 6 from retracting under low displacement, and reducing the influence of displacement on the retraction of the cutter block 6.

[0097] Furthermore, the entire tool is provided with a limiting mechanism and a locking mechanism 7, wherein the limiting mechanism includes a limiting mechanism formed between the slide groove 61 on the cutter block 6 and the push block 41, and a limiting mechanism formed by the inner inclined surface 134 on the outer tube 1, so as to ensure that the cutter block 6 will not be retracted due to external force, and to limit the opening position of the cutter block 6. The locking mechanism 7 is used to prevent the cutter block 6 from being retracted and causing the borehole to shrink due to the movement of the drive sleeve 4 caused by stopping the pump or reducing the displacement after the cutter block 6 is fully opened, thereby ensuring smooth construction.

[0098] Further preferably, a convex ring 44 with a reduced inner diameter is protruded inwardly on the inner wall of the upper end of the driving sleeve 4; the trigger head 32 can be located in the driving sleeve 4 below the convex ring 44 when the throttling sleeve 2 moves down to a preset distance, and can be located in the convex ring 44 when the driving sleeve 4 moves downward to a preset position.

[0099] Reference Fig. 9 The inner diameter of the convex ring 44 is d1, and the inner diameter of the driving sleeve 4 below the convex ring 44 is d2, d2 is greater than d1, the inner cavity of the driving sleeve 4 below the convex ring 44 constitutes a primary throttling inner cavity, and the inner cavity of the convex ring 44 constitutes a secondary throttling inner cavity; when the throttling sleeve 2 moves down to a preset distance, the touch head 32 is located in the driving sleeve 4 below the convex ring 44, and at this time, the first gap between the touch head 32 and the inner wall of the driving sleeve 4 below the convex ring 44 forms a primary throttling, when the driving sleeve 4 moves downward to a preset position under the throttling action, the touch head 32 is located in the convex ring 44, and the second gap between the touch head 32 and the inner wall of the convex ring 44 forms a secondary throttling, because the second gap is smaller than the first gap, the pump pressure at the wellhead will change significantly, so that it can be accurately judged whether the knife block 6 has been opened to the full position.

[0100] In this way, the upper end of the drive sleeve 4 constitutes a cutter block opening monitoring structure. Through the two-stage variable-size throttle hole, it can judge whether the cutter block 6 is fully opened according to the change of the wellhead pump pressure, thereby realizing the monitoring of the opening position of the cutter block 6, which is simple and convenient.

[0101] Furthermore, an annular groove 111 with a closed upper end and an open lower end is formed in the upper portion of the outer tube 1 , and the upper portion of the throttling sleeve 2 is inserted in the annular groove 111 so as to be movable up and down, so as to guide the movement of the throttling sleeve 2 .

[0102] In actual applications, due to the complex working conditions underground, the upper return spring 24 may fail or the knife block 6 may not be retracted. In order to force the knife block 6 to be retracted in this case, a forced recovery mechanism is provided in this embodiment. When the upper return spring 24 fails or the knife block 6 cannot be retracted, the trigger head 32 will pull the drive sleeve 4 upward to a specified position to avoid various situations where the tool knife block 6 cannot be retracted. The structure of the forced recovery mechanism can be implemented, for example, as follows:

[0103] The upper end of the driving sleeve 4 is connected to the connecting sleeve 5, and the upper end of the connecting sleeve 5 is connected to the limiting block 51. The limiting block 51 is provided with a center hole and a plurality of flow holes 511. The diameter of the trigger head 32 is larger than the aperture of the center hole. The trigger rod 3 can move through the center hole. The trigger head 32 is located below the limiting block 51. A bursting disc 25 is installed on the side wall of the throttling sleeve 2, and a ball seat 26 that can be used to support the throttling ball 27 is formed on the lower inner wall of the throttling sleeve 2.

[0104] The shape of the flow hole 511 on the limit block 51 can also be a waist hole similar to the above-mentioned throttling hole 21. The flow hole 511 will also play a certain throttling role, but its main function is to use the upper reset spring 24 to assist in resetting the drive sleeve 4 and the knife block 6 when switching from the drilling plug working state to the grouting working state. The connecting sleeve 5 can be integrally formed with the driving sleeve 4, or it can be fixed after being processed separately. The limit block 51 is generally threadedly connected to the upper inner wall of the connecting sleeve 5. An annular block is convexly provided on the lower inner wall of the throttling sleeve 2 to form a ball seat 26. The upper end surface of the ball seat 26 is an arc surface, so as to support the throttling ball 27 and close the lower end of the throttling sleeve 2.

[0105] When the upper return spring 24 fails, or the blade block 6 cannot be retracted, the ball is thrown (such as Fig.14 As shown in the figure, the throttling sleeve 2 is closed and the pressure is built up. When the pressure reaches a certain value, the bursting disc 25 on the throttling sleeve 2 explodes, and the drilling fluid enters the annular space between the throttling sleeve 2 and the outer tube 1, generating a hydraulic force to push the throttling sleeve 2 upward, and the trigger rod 3 and the trigger head 32 connected to the throttling sleeve 2 move upward together. When the trigger head 32 abuts against the limit block 51, it will push the limit block 51 to pull the drive sleeve 4 upward together, and the step on the drive sleeve 4 pulls the step of the knife block 6 to force the knife block 6 to be retracted, thereby avoiding various situations where the tool knife block 6 cannot be retracted.

[0106] In this embodiment, the outer diameter of the upper limit ring 22 is substantially close to the outer diameter of the annular slide groove 111 , and a plurality of openings are provided on the upper limit ring 22 to ensure that the liquid can smoothly push the throttling sleeve 2 upward.

[0107] In addition, to prevent the drilling fluid from being unable to circulate, a pressure relief valve 113 is provided on the side wall of the outer tube 1, and the pressure relief valve 113 is set directly in the annular space between the outer tube 1 and the throttle sleeve 2; after the ball is dropped, the drilling fluid will re-establish circulation through the pressure relief valve 113. A one-way valve 112 is also provided on the side wall of the outer tube 1, and the one-way valve 112 is located above the upper limit ring 22. The one-way valve 112 can prevent the throttle sleeve 2 from being unable to push due to vacuum generated during the upward movement of the throttle sleeve 2.

[0108] Furthermore, a plurality of nozzle holes 831 are provided in the lower end of the drill bit 8. The nozzle holes 831 can communicate with the inner cavity of the driving sleeve 4 and the outer wall of the lower end of the drill bit 8. The equivalent diameter of the nozzle holes 831 is greater than or equal to 30 mm.

[0109] The nozzle hole 831 adopts a large-sized (equivalent diameter ≥ 30 mm) water eye structure, which can ensure a sufficiently large equivalent diameter while ensuring the rock carrying capacity and facilitating the rapid injection of cement slurry.

[0110] Reference Fig.16 and Fig.17The drill bit 8 comprises a threaded pipe section 81, a connecting pipe section 82 and a terminal section 83 which are sequentially connected from top to bottom. The terminal section 83 is round-headed. A plurality of blades 84 are circumferentially arranged at intervals on the terminal section 83. Each blade wing 84 extends from the upper end of the terminal section 83 to the center of its lower end. The threaded pipe section 81, the connecting pipe section 82, the terminal section and the blade wing 84 are integrally formed. The lower ends of the blades 84 are connected together at the center of the lower end of the terminal section 83 to increase the strength of the drill bit 8. A chip removal groove 85 is formed between two adjacent blade wings 84. A plurality of nozzle holes 831 are arranged in the terminal section 83. The nozzle holes 831 can communicate with the inner cavity of the connecting pipe section 82 and the corresponding chip removal groove 85. A front row of teeth 86 and a rear row of teeth 87 can be set on the blade wing 84, and the rear row of teeth 87 can be selected from plane teeth, non-plane teeth, conical teeth, carbide teeth, etc.; the number of blade wings 84 and water holes is matched, and can be set to five, six or seven, etc.; for example, in this embodiment, five blade wings 84 and three water holes are provided.

[0111] To facilitate processing and installation, the outer tube 1 includes an upper joint 11, a trigger short section 12, an outer tube 13 and a lower joint 14 connected in sequence from top to bottom. The knife block 6 is arranged on the outer tube 13, the throttling sleeve 2 is located in the upper joint 11, the trigger rod 3 is located in the trigger short section 12, the drive sleeve 4 is arranged in the outer tube 13, and the drill bit 8 is connected to the bottom end of the lower joint 14.

[0112] Each component in the outer tube 1 can be connected by thread. The above-mentioned annular groove 111 is formed in the upper joint 11, specifically, the inner wall of the upper joint 11 is provided with a guide tube, the upper end of the guide tube is connected to the inner wall of the upper joint 11 through a closed ring, and the annular groove 111 is formed between the guide tube, the closed ring and the upper joint 11; the one-way valve 112 and the pressure relief valve 113 are both arranged on the outer wall of the upper joint 11. The above-mentioned stop ring 121 is arranged on the inner wall of the trigger short section 12, the upper end outer wall of the outer tube 13 is threadedly connected to the lower end inner wall of the trigger short section 12, and the upper end surface of the outer tube 13 constitutes the above-mentioned stop portion 131; the axial mounting hole 135 and the radial mounting hole are both opened in the side wall of the outer tube 13, the mounting port 132 is opened on the side wall of the outer tube 13, and the knife seat 133 is fixedly connected to the outer tube 13. The above-mentioned support ring 141 is formed in the lower joint 14.

[0113] Furthermore, the present application also provides a drilling tool assembly, which includes the above-mentioned dual-hydraulic continuous plugging drilling multifunctional tool, a check valve, a drill collar, a weighted drill pipe and a drill pipe connected from bottom to top. The outer diameter of the drill bit 8 should be consistent with the drill pipe, and its size is smaller than the borehole size; each blade wing 84 is provided with a back-scoring tooth, and the smaller outer diameter of the drill bit 8 can effectively avoid suction when the drilling fluid needs to be quickly withdrawn during cement slurry injection, and the back-scoring structure of the blade wing 84 is also conducive to the removal of the drill bit 8 when it is not withdrawn from the cementing well bottom 9 in time.

[0114] Furthermore, the present application also provides a double hydraulic continuous plugging drilling method, which uses the above-mentioned tool to perform the operation. The specific construction method includes the following steps:

[0115] Step 1: calibrate the primary throttling and secondary throttling pressure differences of the cutter block opening monitoring mechanism at the wellhead; and test the opening and retracting functions of the cutter block 6 in the dual hydraulic continuous plugging drilling multifunctional tool.

[0116] Step 2: Assemble the drill bit combination, and drill the dual hydraulic continuous plugging drilling multifunctional tool to the plugging target layer, and pull it up several meters after probing the bottom.

[0117] Step 3: Start grouting construction. After the cement slurry is injected, switch to the drilling circulation pipeline, start the pump to inject drilling fluid to replace the cement slurry in the drill bit. After the cement slurry replacement operation is completed, pull the drill to a safe position.

[0118] Step 4: Turn on the pump to circulate the drilling fluid, flush and clean the dual-hydraulic continuous plugging drilling multi-function tool for 5 minutes, and wait for solidification after the flushing operation is completed.

[0119] Step 5: After the cement slurry is solidified, drill again with the dual hydraulic continuous plugging drilling multifunctional tool, stop drilling after probing the top surface of the cement slurry, start the pump, and when the displacement is increased to the working displacement, record the first pump pressure. The hydraulic force generated by the primary throttling cavity pushes the drive sleeve 4 downward, and the three corresponding push blocks 41 on the drive sleeve 4 open the cutter block 6. The drive sleeve 4 moves downward to the maximum stroke position, and the pump pressure increases significantly, indicating that the trigger head 32 enters the secondary throttling cavity of the drive sleeve 4, and the cutter block 6 has been fully opened to the designed wellbore size. At this time, the cutter block 6 is limited and locked, and the drilling parameters are adjusted to the working drilling pressure and rotation speed, and drilling and plugging begins. The difference between the above-mentioned continuous plugging-drilling and plugging operation and the conventional plugging-drilling and plugging operation is that it is not necessary to pull out the drill to replace the plugging drill bit 8, which can avoid overflow caused by suction and hollowing during the drilling process.

[0120] Step 6: After the plugging is completed, the drill is pulled out of the bottom of the well 9, and drilling fluid is injected to seal the well and hold the pressure to check whether the plugging is successful. If the plugging is successful, the drilling parameters can be changed according to the drilled formation to continue drilling.

[0121] Step 7: If the plugging is unsuccessful, repeat the above steps 3 to 6 until the plugging is successful, so as to achieve multiple plugging and drilling operations without starting drilling and replacing drilling tools.

[0122] The whole tool adopts "double hydraulic" form to push out the cutter block 6, and designs a double hydraulic telescopic diameter-changing structure with the throttling sleeve 2, the trigger rod 3, the trigger head 32 and the driving sleeve 4 as the core. The hydraulic action generated by active throttling is used to realize the telescopic diameter-changing of the cutter block 6, and the lead hole size of the drill bit 8 is expanded to the specified full hole size for drilling and plugging operations. The tool can realize the switching between the grouting working condition and the drilling and plugging working condition by controlling the displacement change. The tool can realize the continuous switching between the grouting working condition and the drilling and plugging working condition by only controlling the drilling displacement, replacing the conventional cement plugging and plugging operation to realize the single-layer or even multi-layer plugging-drilling-drilling operation without drilling. The tool has a simple structure and is easy to implement. The matching plugging and plugging operation method effectively shortens the plugging and drilling operation cycle, and has great economic value.

[0123] The above are only exemplary embodiments of the present invention and are not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A dual-hydraulic continuous plugging and drilling multifunctional tool, characterized in that: include: A vertically arranged outer tube has a lower side wall with a plurality of knife blocks which can be opened outwards and arranged at intervals in the circumferential direction; A throttling sleeve, which is movable up and down and is disposed in the outer tube; A trigger rod connected to the bottom of the throttle sleeve; A driving sleeve, which is movable up and down and is disposed in the outer tube and below the trigger rod, and a plurality of push blocks are provided at intervals along the circumference of the outer wall of the driving sleeve; a drill bit connected to the bottom end of the outer tube; Wherein, the throttling sleeve can move downward by a preset distance when the displacement of the liquid injected therein reaches a preset value, and drive the trigger rod to move downward and insert into the driving sleeve to generate throttling, so that the liquid pushes the driving sleeve to move downward to a preset position, and the push block pushes the corresponding knife block outward, and the knife block opens outward; The throttling sleeve and the driving sleeve can move upward and reset after the injection of the liquid stops, and the knife block can be retracted inwardly into the side wall of the outer tube.

2. The dual-hydraulic continuous leak plugging drilling multifunctional tool as claimed in claim 1, characterized in that: The throttling sleeve is a cylindrical structure with an upper end opening and a plurality of throttling holes on the lower end surface, and an upper limit ring and a lower limit ring are respectively provided on the outer walls at both ends; a stop ring and a stop part are arranged at intervals up and down on the inner wall of the outer tube, and the upper limit ring and the lower limit ring are respectively located on both sides of the stop ring; The outer wall of the throttling sleeve is provided with an upper return spring, and the two ends of the upper return spring respectively abut between the upper limit ring and the stop ring; the lower limit ring can move downward to abut against the stop portion when the displacement of the liquid reaches the preset value, and can abut against the stop ring after the throttling sleeve is reset.

3. The dual-hydraulic continuous leak plugging drilling multifunctional tool as claimed in claim 1, characterized in that: A support ring is formed on the lower inner wall of the outer tube, and a plurality of arc blocks are circumferentially spaced on the support ring. A plurality of limit plates are circumferentially spaced on the outer wall of the lower end of the driving sleeve, and a lower return spring is sleeved on the outer circumference of the plurality of arc blocks; each of the limit plates is inserted between two corresponding adjacent arc blocks so as to be movable up and down, and two ends of the lower return spring respectively abut against the limit plate and the support ring.

4. The dual-hydraulic continuous leak plugging drilling multifunctional tool as claimed in claim 1, characterized in that: A slide groove is provided on the inner side of the blade block, and the slide groove includes an inclined groove and a flat groove connected up and down, the bottom groove wall of the inclined groove is an inner inclined surface, and the groove wall of the flat groove is a plane; The lower outer wall of the push block is an outer inclined surface, and the upper outer wall thereof is a vertical plane. The shape of the inclined groove matches the shape of the push block. When the drive sleeve moves downward to a preset position, the push block can be inserted into the flat groove and the vertical plane fits with the groove wall of the flat groove.

5. The dual-hydraulic continuous leak plugging drilling multifunctional tool as claimed in claim 1, characterized in that: The outer wall of the outer tube is provided with a plurality of mounting openings in the circumferential direction, and the upper end of each of the blade blocks is connected to the outer tube via a rotating shaft, and the axial direction of the rotating shaft is perpendicular to the axial direction of the outer tube; An inner bevel is provided on the inner wall of the outer tube and adjacent to the lower position of the installation opening, and an outer bevel is provided on the lower end surface of the knife block. The outer bevel can abut against the inner bevel after the knife block is opened outward.

6. The dual-hydraulic continuous leak plugging drilling multifunctional tool as claimed in claim 2, characterized in that: A locking push rod that can elastically move up and down and a locking push rod that can elastically move radially are provided in the side wall of the outer tube, the upper end of the locking push rod can extend upward from the stopper, the lower end of the locking push rod has an upper inclined surface, the locking push rod is located below the locking push rod and has a lower inclined surface that can cooperate with the upper inclined surface, and the upper inclined surface can abut against the lower inclined surface; A locking limit hole is provided on the outer wall of the driving sleeve, and when the lower limit ring moves downward and abuts against the stop portion, it can push the locking push rod to move downward, so that when the driving sleeve moves downward to a preset position, the locking push rod is inserted into the locking limit hole.

7. The dual-hydraulic continuous leak plugging and drilling multifunctional tool as claimed in claim 6, characterized in that: An axial mounting hole and a radial mounting hole are provided in the side wall of the outer tube, the upper end of the axial mounting hole passes through the stopper upward, the radial mounting hole is connected with the lower end of the axial mounting hole and radially passes through the inner wall of the outer tube; a stepped hole with an increased aperture is formed at the first end of the axial mounting hole, a plug is installed in the end of the stepped hole, the upper end of the locking push rod can move up and down through the plug, the upper outer wall of the locking push rod has an annular first flange, the first flange is located below the plug, the locking push rod outer sleeve is provided with a locking return spring, and the two ends of the locking return spring respectively press against the first flange and the bottom hole shoulder of the stepped hole; A mounting sleeve is provided in the radial mounting hole, and the locking push rod includes a push column and a locking pin provided in the mounting sleeve, the push column is formed with the lower inclined surface, and the lower end of the locking push rod can extend into the mounting sleeve and abut against the lower inclined surface; an annular second flange is provided on the upper outer wall of the push column, a first spring is clamped between the second flange and the step in the mounting sleeve, a second spring is provided between the push column and the locking pin, and the locking pin can extend radially inward and be inserted in the locking limit hole.

8. The dual-hydraulic continuous leak plugging drilling multifunctional tool as claimed in claim 2, characterized in that: The lower end of the trigger rod is connected with a trigger head, the diameter of the trigger head is larger than the diameter of the trigger rod, and the trigger head can move into the driving sleeve when the throttling sleeve moves downward.

9. The dual-hydraulic continuous leak plugging drilling multifunctional tool as claimed in claim 8, characterized in that: The inner wall of the upper end of the driving sleeve is provided with a convex ring with a reduced inner diameter; the actuating head can be located in the driving sleeve below the convex ring when the throttling sleeve moves down to a preset distance, and can be located in the convex ring when the driving sleeve moves downward to a preset position.

10. The dual-hydraulic continuous leak plugging and drilling multifunctional tool as claimed in claim 8, characterized in that: An annular sliding groove with a closed upper end and an open lower end is formed in the upper part of the outer tube, and the upper part of the throttling sleeve is inserted in the annular sliding groove so as to be movable up and down.

11. The dual-hydraulic continuous leak plugging and drilling multifunctional tool as claimed in claim 10, characterized in that: The upper end of the driving sleeve is connected to a connecting sleeve, and a limiting block is connected to the upper end of the connecting sleeve. A center hole and a plurality of flow holes are formed on the limiting block. The diameter of the trigger head is larger than the aperture of the center hole. The trigger rod can move through the center hole. The trigger head is located below the limiting block. A bursting disc is installed on the side wall of the throttling sleeve, and a ball seat that can be used to support a throttling ball is formed on the lower inner wall of the throttling sleeve.

12. The dual-hydraulic continuous leak plugging drilling multifunctional tool as claimed in claim 11, characterized in that: A one-way valve and a pressure relief valve are arranged on the side wall of the outer tube in an upper and lower spacing arrangement. The pressure relief valve is arranged facing the annular space between the outer tube and the throttling sleeve, and the one-way valve is located above the upper limit ring.

13. The dual-hydraulic continuous leak plugging and drilling multifunctional tool as claimed in claim 1, characterized in that: A plurality of nozzle holes are arranged in the lower end of the drill bit, and the nozzle holes can communicate with the inner cavity of the drive sleeve and the outer wall of the lower end of the drill bit, and the equivalent diameter of the nozzle holes is greater than or equal to 30 mm.

14. The dual-hydraulic continuous leak plugging and drilling multifunctional tool as claimed in claim 1, characterized in that: The outer tube includes an upper joint, a trigger short section, an outer tube and a lower joint which are sequentially connected from top to bottom, the knife block is arranged on the outer tube, the throttling sleeve is located in the upper joint, the trigger rod is located in the trigger short section, the driving sleeve is arranged in the outer tube, and the drill bit is connected to the bottom end of the lower joint.

15. A double hydraulic continuous plugging drilling method, characterized in that: The dual hydraulic continuous plugging drilling method comprises: Connecting a drill pipe and the dual hydraulic continuous leak plugging drilling multifunctional tool as claimed in any one of claims 1 to 14 to form a drilling tool assembly, and lowering the dual hydraulic continuous leak plugging drilling multifunctional tool to the leak plugging target layer; Start grouting construction. After the cement slurry is injected, start the pump to inject drilling fluid to replace the cement slurry in the drilling tool assembly. After the cement slurry replacement operation is completed, pull the drill to a safe position; After the cement slurry is solidified, the dual hydraulic continuous plugging drilling multifunctional tool is drilled again, the pump is turned on to increase the displacement to the preset value, the lower end of the trigger rod enters the drive sleeve to generate throttling, and the generated hydraulic thrust pushes the drive sleeve to move downward to the preset position, the push block pushes the knife block to open outward, and the drilling and plugging construction begins; After the plugging is completed, the drill is pulled out from the bottom of the well, drilling fluid is injected, the well is sealed and the pressure is held down to check whether the plugging is successful; If the plugging is unsuccessful, repeat the grouting and drilling until the plugging is successful; Carry out drilling operations.

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