Dual-hydraulic multifunctional tool capable of continuous plugging and drilling, and method

Abstract

A dual-hydraulic multifunctional tool capable of continuous plugging and drilling, and a method. The tool comprises an outer pipe (1), a throttling sleeve (2), a trigger rod (3), a driving sleeve (4) and a drill bit (8), wherein a plurality of cutter blocks (6) are provided in a lower side wall of the outer pipe (1), the throttling sleeve (2) is vertically movably disposed in the outer pipe (1), the trigger rod (3) is connected to the bottom of the throttling sleeve (2), and a plurality of push blocks (41) are circumferentially provided on an outer wall of the driving sleeve (4) at intervals. The throttling sleeve (2) can move downward by a preset distance when the displacement of a fluid injected thereinto reaches a preset value, and can drive the trigger rod (3) to move downward and be inserted into the driving sleeve (4) to create a throttling effect, so that the fluid pushes the driving sleeve (4) to move downward to a preset position, the push blocks (41) push corresponding cutter blocks (6) outward, and the cutter blocks (6) are open outward. The tool and method can replace existing plain drill pipes to perform cement injection and plugging, and can also replace roller bits to drill through cement plugs, thereby implementing multiple continuous cement plugging operations without tripping out. Furthermore, after cement plugs are drilled through, the tool still has normal drilling capability, thereby reducing the number of trips, and greatly shortening a plugging operation cycle.

Description

A multifunctional double-hydraulic continuous plugging drilling tool and method

[0001] Related applications

[0002] This application claims priority to Chinese patent application No. 202311222296.7 filed on September 21, 2023, and cites the contents disclosed in the above patent application as part of this application. Technical Field

[0003] The present application relates to the field of oil drilling, and in particular to a dual-hydraulic continuous leak plugging drilling multifunctional tool and method. Background Art

[0004] During drilling operations, lost circulation seriously restricts drilling speed. Various complex situations are directly related to lost circulation and cause huge economic losses. The management of lost circulation is related to the exploration and development process and has always been a problem of particular concern to the petroleum engineering community. Due to the complex causes of lost circulation and the many constraints, it has become a technical challenge faced by drilling and completion projects. Cement plugging is the main method for plugging serious lost circulation. Due to the complex downhole conditions, it cannot be guaranteed to be successful in one go, and multiple and repeated plugging may be required in the same lost circulation layer. In order to achieve the requirements of large-volume rapid cement slurry injection and avoid safety accidents caused by the tools being sealed at the bottom of the well by cement, the current conventional plugging method is to inject cement into the drill pipe, then pull the drill bit out of the well to replace the roller drill bit to drill the cement plug, and then check whether the plugging is successful. If not, the above operation procedure is repeated until the plugging is successful. After the plugging is successful, the drill bit assembly needs to be replaced before drilling can continue. However, although this method has a good plugging effect, it may require multiple and repeated plugging operations in the same leaking layer, and the drilling process must be frequently tripped and lowered, which complicates the overall process. This not only increases the risk of downhole operations but also seriously delays the drilling cycle, which is particularly evident in deep and ultra-deep wells.

[0005] Therefore, the inventor, relying on many years of experience and practice in related industries, proposes a dual-hydraulic continuous leak plugging drilling multifunctional tool and method to overcome the defects of the prior art.

[0006] Summary of the Invention

[0007] The purpose of the present application is to provide a dual-hydraulic continuous plugging drilling multifunctional tool and method, which can replace the existing bare drill rod cementing plugging and replace the roller drill bit to drill cement plugs, and realize multiple continuous cement plugging operations without drilling. At the same time, it still has normal drilling capabilities after the drilling and plugging are completed, reducing the number of drilling and drilling, and greatly shortening the plugging operation cycle.

[0008] The above-mentioned purpose of this application can be achieved by adopting the following technical solutions:

[0009] The present application provides a dual-hydraulic continuous leak plugging drilling multifunctional tool, comprising:

[0010] A vertically arranged outer tube has a lower side wall with a plurality of outwardly opening blade blocks spaced circumferentially therein;

[0011] A throttle sleeve, which is movable up and down and is arranged inside the outer tube;

[0012] a trigger rod connected to the bottom of the throttle sleeve;

[0013] A driving sleeve is arranged in the outer tube and below the trigger rod so as to be movable up and down, and a plurality of push blocks are arranged at intervals along the circumference of the outer wall of the driving sleeve;

[0014] a drill bit connected to the bottom end of the outer tube;

[0015] 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 is retracted inward to the side wall of the outer tube.

[0016] In a preferred embodiment of the present application, the throttling sleeve is a cylindrical structure with an open 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.

[0017] In a preferred embodiment of the present application, 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 provided on the outer periphery of the plurality of arc blocks; each limit plate can be moved up and down and inserted between the corresponding adjacent two arc blocks, and the two ends of the lower return spring respectively press against the limit plate and the support ring.

[0018] In a preferred embodiment of the present application, 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 upper and lower parts, 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. When the drive sleeve moves downward to the 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.

[0019] In a preferred embodiment of the present application, a plurality of mounting openings are provided on the circumference of the outer wall of the outer tube, and the upper end of each blade block is connected to the outer tube through 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 face of the blade block, and the outer bevel can rest against the inner bevel after the blade block is opened outward.

[0020] In a preferred embodiment of the present application, 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 the preset position.

[0021] In a preferred embodiment of the present application, 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 passes through the stopper upward, and the radial mounting hole is connected to the lower end of the axial mounting hole and radially passes through the inner wall of the outer tube; the first end of the axial mounting hole is formed with a stepped hole with an increased aperture, and 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, and the upper outer wall of the locking push rod has a first annular flange, which 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, and the locking push rod includes a push column and a locking pin arranged in the mounting sleeve, and 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 rest against the lower inclined surface; an annular second flange is provided on the upper outer wall of the push column, and a first spring is sandwiched between the second flange and the step in the mounting sleeve, and 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.

[0022] In a preferred embodiment of the present application, 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 drive sleeve when the throttle sleeve moves downward.

[0023] In a preferred embodiment of the present application, a convex ring with a reduced inner diameter is protruded inwardly on the inner wall of the upper end of the driving sleeve; the touch head can be located in the driving sleeve below the convex ring when the throttle 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.

[0024] In a preferred embodiment of the present application, 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 throttle sleeve is inserted into the annular chute so as to be movable up and down.

[0025] In a preferred embodiment of the present application, 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. The limiting block is provided with a center hole and multiple flow holes. 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.

[0026] In a preferred embodiment of the present application, a one-way valve and a pressure relief valve are provided on the side wall of the outer tube, which are arranged in an upper and lower intervals. The pressure relief valve is arranged in the annular space between the outer tube and the throttle sleeve, and the one-way valve is located above the upper limit ring.

[0027] In a preferred embodiment of the present application, 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.

[0028] In a preferred embodiment of the present application, 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 drive sleeve is arranged in the outer tube, and the drill bit is connected to the bottom end of the lower joint.

[0029] The present application also provides a dual hydraulic continuous plugging drilling method, which includes:

[0030] 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;

[0031] Start grouting. After the cement slurry is injected, start the pump to inject drilling fluid to replace the cement slurry in the drill string assembly. After the cement slurry replacement operation is completed, pull the drill to a safe position.

[0032] After the cement slurry has solidified, the dual hydraulic continuous plugging drilling multifunctional tool is lowered again (i.e., after the cement slurry has solidified, the dual hydraulic continuous plugging drilling multifunctional tool provided by the present application is used to drill again). The pump is turned on to increase the displacement to a preset value. The lower end of the trigger rod enters the drive sleeve to generate throttling. The generated hydraulic thrust pushes the drive sleeve downward to a preset position. The push block pushes the cutter block outward to start drilling and plugging.

[0033] 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;

[0034] If the leak is not plugged successfully, repeat the grouting and drilling construction until the leak is successfully plugged;

[0035] Carry out drilling operations.

[0036] As described above, in the tool and method of the present application, 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 force generated by the throttling effect 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. Below the critical displacement, the knife block will not be triggered by mistake. When the knife block needs to be extended, it is only necessary 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 grouting and drilling conditions 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 continuous 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 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

[0037] The following figures are intended only to illustrate and explain the present application and are not intended to limit the scope of the present application.

[0038] Figure 1: Schematic diagram of the dual hydraulic continuous plugging drilling multifunctional tool provided in this application during grouting operation.

[0039] Figure 2: Schematic diagram of the dual-hydraulic continuous plugging drilling multifunctional tool provided in this application after the touch head is inserted into the drive sleeve.

[0040] Figure 3: Schematic diagram of the dual hydraulic continuous plugging drilling multifunctional tool provided in this application in the drilling and plugging working condition.

[0041] FIG4 is a schematic diagram of the throttle hole at the bottom of the throttle sleeve provided in this application.

[0042] Figure 5: Schematic diagram of the lower joint provided for this application.

[0043] Figure 6: Schematic diagram of the cooperation between the lower joint and the drive sleeve provided in this application.

[0044] Figure 7 is a cross-sectional view of Figure 6.

[0045] Figure 8 is a three-dimensional view of the drive sleeve and the connecting sleeve provided in this application.

[0046] Figure 9 is a partial cross-sectional view of the drive sleeve and the connecting sleeve provided for this application.

[0047] Figure 10: Schematic diagram of the knife block provided for this application.

[0048] Figure 11: An enlarged view of the locking mechanism provided for this application.

[0049] Figure 12: Schematic diagram of the cooperation between the mounting sleeve, the top column and the locking pin in the locking mechanism provided in this application.

[0050] Figure 13: A three-dimensional diagram of the mounting sleeve, top column and locking pin in the locking mechanism provided in this application.

[0051] Figure 14 is a schematic diagram of the dual hydraulic continuous plugging drilling multifunctional tool provided in this application after the ball is dropped to cut off the fluid during the ball-dropping forced recovery process.

[0052] Figure 15: Schematic diagram of the dual hydraulic continuous plugging drilling multifunctional tool provided in the present application, in which the throttling sleeve moves upward to the initial state during the ball-throwing forced recovery process.

[0053] Figure 16: Schematic diagram 1 of the drill bit provided in this application.

[0054] Figure 17: Schematic diagram 2 of the drill bit provided in this application.

[0055] Explanation of Reference Numerals: 1. Outer tube; 11. Upper joint; 111. Annular groove; 112. Check valve; 113. Pressure relief valve; 12. Trigger nipple; 121. Stop ring; 13. Outer tube; 131. Stop portion; 132. Mounting opening; 133. Knife holder; 1331. Rotating shaft; 134. Inner bevel; 135. Axial mounting hole; 14. Lower joint; 141. Support ring; 142. Arc block; 143. Lower return spring; 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; 3. Trigger rod; 32. Trigger head; 4. Drive sleeve; 41. Push block; 411. Outer inclined surface; 412. Vertical plane; 42. Limit plate; 43. Locking limit hole; 44. Raised ring; 5. Connecting sleeve; 51. Limit block; 511. Flow hole; 6. Blade block; 61. Slide groove; 611. Bevel groove; 6111. Inner inclined surface; 612. Flat groove; 613. Outer inclined surface; 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; 74. Ejector column; 741. Second flange; 75. First spring; 76. Second spring; 77. Locking pin; 78. Block; 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; 9. Bottom of the well. DETAILED DESCRIPTION

[0056] In order to have a clearer understanding of the technical features, purposes and effects of this application, the specific implementation methods of this application are now described with reference to the accompanying drawings.

[0057] As shown in Figures 1 to 17, the present application provides a dual hydraulic continuous plugging and drilling multifunctional tool, comprising:

[0058] The outer tube 1 is vertically arranged, and a plurality of knife blocks 6 that can be opened outwards are provided at intervals along the inner circumference of the lower side wall;

[0059] A throttle sleeve 2 is arranged inside the outer tube 1 and can move up and down;

[0060] A trigger rod 3 connected to the bottom of the throttle sleeve 2;

[0061] The driving sleeve 4 is movable up and down inside the outer tube 1 and below the trigger rod 3. A plurality of push blocks 41 are provided at intervals along the outer wall of the driving sleeve 4.

[0062] a drill bit 8 connected to the bottom end of the outer tube 1;

[0063] Among them, the throttling sleeve 2 can move downward 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.

[0064] Specifically, the throttle sleeve 2 remains stationary in its initial state when the liquid displacement is less than a preset value, and only moves downward when the liquid displacement reaches the preset value. In their initial state, each blade block 6 is located within the sidewall of the outer tube 1. The number of push blocks 41 is the same as the number of blade blocks 6. For example, in this embodiment, there are three push blocks 41 and three blade blocks 6, each evenly spaced circumferentially. The drill bit 8 has a nozzle hole 831. The upper end of the outer tube 1 communicates with the inner cavity of the throttle sleeve 2, the inner cavity of the drive sleeve 4, and the nozzle hole 831 in the drill bit 8, forming a liquid flow channel for liquid (cement slurry or drilling fluid) to flow through.

[0065] During use, after the tool is lowered into the leaking well location, cement slurry is injected into the liquid circulation channel. 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 liquid displacement 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 generate throttling. At this time, the inside of the tool will have a sufficiently large equivalent diameter from top to bottom to complete the smooth injection of cement slurry, as shown in 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 downward 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 Figure 2, and throttling will occur. The throttling force pushes the driving sleeve 4 downward, and the push blocks 41 on the driving sleeve 4 will push the cutter blocks 6 to open outward, so that the outer diameter of each cutter block 6 expands to the full-eye size to form the drilling condition, as shown in Figure 3; the drilling operation can be carried out by driving the entire tool to rotate.

[0066] After drilling and plugging are complete, fluid flow is stopped (further fluid injection ceases), the throttle sleeve 2 and drive sleeve 4 are repositioned, and the cutter block 6 is retracted. The tool is then raised a certain distance for a well sealing and pressure test. If leaks persist, plugging and drilling are repeated until the pressure test meets the requirements. Once plugging is successful, the drilling fluid flow rate is increased again, causing the cutter block 6 to open outward, and drilling can resume normally.

[0067] Therefore, with the tool of the present application, when the liquid displacement is less than the preset value during the grouting process, the throttling sleeve 2 will not move downward, and the tool has a larger equivalent diameter inside to ensure large-displacement grouting; 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 force generated by the throttling effect 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. The knife block 6 will not be triggered by mistake below the critical displacement. When the knife block 6 needs to be extended, it is only necessary 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 and the displacement of drilling fluid, the switching between the grouting mode and the drilling mode 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 is completed, it can continue to drill into the new formation, have normal drilling capabilities, further reduce the number of drilling and pulling out, not only greatly shorten the plugging operation cycle, but also improve the drilling operation efficiency.

[0068] In a specific implementation, referring 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 respectively 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 respectively 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.

[0069] The bottom surface of the throttle sleeve 2 has a central hole, into which the upper end of the trigger rod 3 is inserted and threaded. Multiple throttle holes 21 are located around the central hole. These holes can be waist-shaped, as shown in Figure 4. These holes create a primary throttle when the liquid flows through them, effectively driving the throttle sleeve 2 at relatively low displacements. The specific size and number of throttle holes 21 are determined as needed to ensure that the lower portion of the throttle sleeve 2 has a sufficient equivalent diameter.

[0070] In actual applications, a significant force is generally required to push the drive sleeve 4. To increase the throttling force generated during secondary throttling, a trigger head 32 is connected (e.g., threadedly) to the lower end of the trigger rod 3. The diameter of the trigger head 32 is larger than that of the trigger rod 3. The trigger head 32 can move into the drive 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 drive sleeve 4 to generate sufficient throttling force.

[0071] During design, the upper return spring 24 should be reasonably selected 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. The trigger head 32 will not move into the driving sleeve 4 to generate 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 drilling plug, the displacement is increased to a preset value, and the throttling sleeve 2 will generate a throttling force greater than the upper return spring 24, that is, the hydraulic thrust generated by the throttling sleeve 2. The hydraulic thrust generated by the throttling sleeve 2 compresses the upper return spring 24, pushing the entire throttling sleeve 2 downward and driving the trigger rod 3 and the trigger head 32 downward. The trigger head 32 moves into the driving sleeve 4. At this time, the equivalent diameter of the driving sleeve 4 is sharply reduced (as shown in Figure 2), which will generate secondary throttling, 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-size plug. When the drilling is completed and the displacement is stopped, the throttle sleeve 2 is reset under the push of the upper reset spring 24.

[0072] To facilitate the resetting of the drive sleeve 4, a support ring 141 may be formed on the lower inner wall of the outer tube 1, and a lower return spring 143 may be interposed between the bottom end of the drive sleeve 4 and the support ring 141. When drilling is completed and displacement stops, the drive sleeve 4 is pushed back to its original position by the lower return spring 143, and simultaneously the push block 41 of the drive sleeve 4 drives the cutter block 6 back to its original position.

[0073] In a preferred embodiment, referring to Figures 5 to 8, a support ring 141 is formed on the lower inner wall 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 drive 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 can be 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 respectively press against the limit plate 42 and the support ring 141.

[0074] It is 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 circumferentially limit the limit plates 42, thereby preventing the drive sleeve 4 from circumferentially rotating within the outer tube 1, and providing a more stable structure.

[0075] Further, referring to Figures 9 and 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 upper and lower. 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 side wall is a vertical plane 412. The shape of the inclined groove 611 matches the shape of the push block 41. When the drive 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.

[0076] 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 blade block 6 is located inside the side wall of the outer tube 1, and the push block 41 is inserted into the inclined groove 611 of the blade block 6. The blade 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 blade block 6 slides along the push block 41, and also ensures that the drive sleeve 4 does not rotate arbitrarily inside the tool; the slide groove 61 of the blade block 6 is in the shape of a slope-plane, with the slope serving as a guide and the plane serving as a limit, ensuring that the blade block 6 will not be compressed and retracted due to external force after it is opened, and the structure is more stable.

[0077] 1 and 10 , a plurality of mounting openings 132 are circumferentially provided on the outer wall of the outer tube 1. The upper end of each blade block 6 is connected to the outer tube 1 via a rotating shaft 1331. 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. An outer bevel 613 is provided on the lower end face of the blade block 6. The outer bevel 613 can rest against the inner bevel 134 after the blade block 6 is opened outward.

[0078] A blade holder 133 is typically mounted at the upper end of the mounting opening 132. The blade holder 133 is connected to the outer tube 1 via fasteners, and the upper end of the blade block 6 is connected to the blade holder 133 via a rotating shaft 1331, making processing and installation more convenient. A U-shaped groove is provided on the lower end surface of the blade holder 133, allowing the blade holder 133 to fit snugly against the arcuate connecting block at the upper end of the blade block 6 (the arcuate connecting block is provided with a mounting hole for mounting the rotating shaft 1331). During drilling, the axial force applied to the blade block 6 can act directly on the blade holder 133, preventing damage to the rotating shaft 1331 and extending the service life of the blade block 6. The aforementioned inner bevel 134 limits the outward opening position of the blade block 6, ensuring that the blade block 6 does not expand further once it has opened to the specified size.

[0079] Furthermore, a locking mechanism 7 is provided inside the outer tube 1, which is used to limit and lock the cutter block 6 when it is extended to the specified wellbore size under the drilling and plugging condition.

[0080] 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 the preset position.

[0081] When the locking cam 71 is in the closed position, the locking cam 71 is in the closed position, and the locking cam 71 is in the closed position, and the locking cam 71 is in the open position, and the locking cam 71 is in the closed position, and the locking cam 71 is in the open position, and the locking cam 71 is in the closed position, and the locking cam 71 is in the closed position, and the locking cam 71 is in the closed position, and the locking cam 71 is in the closed position, and the locking cam 71 is in the closed position, and the locking cam 71 is in the closed position, and the locking cam 71 is in the closed position, and the locking cam 71 is in the closed position, and the locking cam 71 is in the closed position, and the locking cam 71 is in the closed position, and the locking cam 71 is in the closed position, and the locking cam 71 is in the closed position, and the locking cam 71 is in the closed position, and the locking cam 71 is in the closed position, and the locking cam 71 is in the closed position, and the locking cam 71 is in the closed position, and the locking cam 71 is in the closed position, and the locking cam

[0082] 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 provided 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 rest on 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); a second annular 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 into the locking limit hole 43.

[0083] The plug 72 has a central opening to facilitate the insertion of the locking push rod 71. The inner bore of the mounting sleeve 73 includes a first stepped hole 731 and a second stepped hole 732, which are arranged in a manner interconnected. The diameter of the second stepped hole 732 is larger than that of the first stepped hole 731, and the diameter of the first stepped hole 731 is larger than the diameter of the top post 74. The locking pin 77 and the second spring 76 are located within the first stepped hole 731. The top post 74 is located within the second stepped hole 732, with its lower end extending into the first stepped hole 731. The ends of the first spring 75 respectively abut against the second flange 741 and the shoulders of the second stepped hole 732 (i.e., the steps within the mounting sleeve 73). The ends of the second spring 76 are generally fixed between the top post 74 and the locking pin 77. To facilitate installation, a radial mounting hole also extends radially through the outer wall of outer tube 1. After all components are installed, a blocking block 78 is installed (threaded) within the radial mounting hole, near the outer wall of outer tube 1, to isolate the external liquid. A limiting step is defined on the inner wall of the radial mounting hole. The central outer wall of mounting sleeve 73 has a corresponding step that abuts against this limiting step. The inner end face of blocking block 78 presses against the outer end face of mounting sleeve 73 to secure it in place.

[0084] 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.

[0085] During use, when the throttle sleeve 2 moves downward until the lower limit ring 23 abuts against the stop portion 131, the lower limit ring 23 pushes the locking push rod 71 downward, and the upper and lower inclined surfaces push the push column 74 radially inward. That is, the upper and lower inclined surfaces push the push column 74 radially inward, and push the locking pin 77 inward. Due to the presence 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 block the drive sleeve 4. When the locking limit hole 43 moves into place, the locking pin 77 is inserted into the locking limit hole 43 under the action of the second spring 76 to lock the drive sleeve 4, preventing the sudden change in drilling fluid displacement from causing the cutter block 6 to retract and reduce its diameter. Ultimately, the cutter block 6 is prevented from retracting at low displacement, reducing the impact of the displacement on the cutter block 6.

[0086] Furthermore, the entire tool is equipped with a limiting mechanism and a locking mechanism 7. The limiting mechanism includes a limiter formed between the slide groove 61 on the cutter block 6 and the push block 41, and a limiter formed by the inner bevel 134 on the outer tube 1. These limiters are used to prevent the cutter block 6 from retracting due to external forces and to limit the open position of the cutter block 6. The locking mechanism 7 is used to prevent the cutter block 6 from retracting and causing the wellbore to shrink due to 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.

[0087] Further preferably, a convex ring 44 with a reduced inner diameter is protruded inwardly on the inner wall of the upper end of the drive sleeve 4; the touch head 32 can be located in the drive sleeve 4 below the convex ring 44 when the throttle sleeve 2 moves down to a preset distance, and can be located in the convex ring 44 when the drive sleeve 4 moves downward to a preset position.

[0088] 9 , the inner diameter of the convex ring 44 is d1, and the inner diameter of the drive sleeve 4 below the convex ring 44 is d2, d2 is greater than d1, and the inner cavity of the drive 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 drive sleeve 4 below the convex ring 44. At this time, the first gap between the touch head 32 and the inner wall of the drive sleeve 4 below the convex ring 44 forms a primary throttling. When the drive 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. Since the second gap is smaller than the first gap, the pump pressure at the wellhead will change significantly, thereby accurately judging whether the knife block 6 has been opened to its full position.

[0089] 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 by the change of wellhead pump pressure, thereby realizing the monitoring of the opening position of the cutter block 6, which is simple and convenient.

[0090] Furthermore, an annular chute 111 with a closed upper end and an open lower end is formed in the upper part of the outer tube 1. The upper part of the throttle sleeve 2 can be inserted into the annular chute 111 and moved up and down to guide the movement of the throttle sleeve 2.

[0091] In actual applications, due to the complex working conditions underground, the upper return spring 24 may sometimes fail or the tool block 6 may not be retracted. In order to forcibly retract the tool block 6 in such a situation, a forced retraction mechanism is provided in this embodiment. When the upper return spring 24 fails or the tool block 6 cannot be retracted, the trigger head 32 will pull the drive sleeve 4 upward to a specified position, thereby avoiding various situations in which the tool tool block 6 cannot be retracted. The structure of the forced retraction mechanism can be implemented as follows:

[0092] The upper end of the drive sleeve 4 is connected to the connecting sleeve 5, and the upper end of the connecting sleeve 5 is connected to the limit block 51. The limit block 51 is provided with a center hole and multiple flow holes 511. The diameter of the touch head 32 is larger than the aperture of the center hole. The touch rod 3 can move through the center hole. The touch head 32 is located below the limit block 51; a bursting disc 25 is installed on the side wall of the throttling sleeve 2, and a ball seat 26 for supporting the throttling ball 27 is formed on the lower inner wall of the throttling sleeve 2.

[0093] 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 also plays 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 blade 6 when switching from the drilling plug working mode to the grouting working mode. The connecting sleeve 5 can be integrally formed with the drive 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 protruding from the lower inner wall of the throttling sleeve 2 and constitutes a ball seat 26, that is, the ball seat 26 is protruding from the lower inner wall of the throttling sleeve 2. The upper end surface of the ball seat 26 is an arc surface, so as to be able to support the throttling ball 27, so that the lower end of the throttling sleeve 2 is closed.

[0094] When the upper return spring 24 fails or the knife block 6 cannot be retracted, a ball is thrown (as shown in FIG14 ) to close the throttle sleeve 2 and hold the pressure. When the pressure reaches a certain value, the bursting disc 25 on the throttle sleeve 2 explodes, and the drilling fluid enters the annular space between the throttle sleeve 2 and the outer tube 1, generating a hydraulic force to push the throttle sleeve 2 upward, and the trigger rod 3 and the trigger head 32 connected to the throttle 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. The step on the drive sleeve 4 pulls the step of the knife block 6 to force the knife block 6 to retract, thereby avoiding various situations where the tool knife block 6 cannot be retracted.

[0095] 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.

[0096] In addition, to prevent drilling fluid from being unable to circulate, a pressure relief valve 113 is installed on the side wall of the outer tube 1. The pressure relief valve 113 is located 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 installed on the side wall of the outer tube 1. The one-way valve 112 is located above the upper limit ring 22. This one-way valve 112 prevents the throttle sleeve 2 from being unable to push due to vacuum during its upward movement.

[0097] Furthermore, a plurality of nozzle holes 831 are provided in the lower end portion of the drill bit 8. The nozzle holes 831 can communicate with the inner cavity of the drive 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.

[0098] The nozzle hole 831 adopts a large-sized (equivalent diameter ≥ 30 mm) water hole structure, which can ensure a sufficiently large equivalent diameter while ensuring rock carrying capacity and facilitating rapid injection of cement slurry.

[0099] 16 and 17 , the drill bit 8 comprises a threaded tube section 81, a connecting tube section 82, and a head section 83, which are sequentially connected from top to bottom. The head section 83 is rounded and has a plurality of blades 84 circumferentially spaced apart thereon. Each blade wing 84 extends from the upper end of the head section 83 toward the center of its lower end. The threaded tube section 81, connecting tube section 82, head section, and blades 84 are integrally formed. The lower ends of the blades 84 are connected together at the center of the lower end of the head section 83 to increase the strength of the drill bit 8. A chip flute 85 is formed between adjacent blades 84. Multiple nozzle holes 831 are provided within the head section 83, connecting the inner cavity of the connecting tube section 82 with the corresponding chip flutes 85. A front row of teeth 86 and a rear row of teeth 87 can be set on the blade 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 blades 84 and water holes is matched and can be set to five, six or seven, etc. For example, in this embodiment, there are five blades 84 and three water holes.

[0100] 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 sequentially from top to bottom. The cutter block 6 is provided on the outer tube 13, the throttle 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 provided in the outer tube 13, and the drill bit 8 is connected to the bottom end of the lower joint 14.

[0101] The various components in the outer tube 1 can be connected by threads. The aforementioned annular groove 111 is formed within the upper joint 11. Specifically, a guide tube is provided on the inner wall of the upper joint 11. The upper end of the guide tube is connected to the inner wall of the upper joint 11 via a closed ring. The guide tube, closed ring, and upper joint 11 form the annular groove 111. The one-way valve 112 and the pressure relief valve 113 are both located on the outer wall of the upper joint 11. The aforementioned stop ring 121 is located on the inner wall of the trigger stub 12. The upper outer wall of the outer tube 13 is threadedly connected to the lower inner wall of the trigger stub 12. The upper end surface of the outer tube 13 forms the aforementioned stop portion 131. The axial mounting hole 135 and the radial mounting hole are both provided in the side wall of the outer tube 13. The mounting port 132 is provided on the side wall of the outer tube 13. The blade seat 133 is fixed to the outer tube 13. The aforementioned support ring 141 is formed within the lower joint 14.

[0102] Furthermore, the present application provides a drill tool assembly comprising the aforementioned dual-hydraulic continuous plugging drilling multifunctional tool, a check valve, a drill collar, a weighted drill pipe, and a drill rod, connected from bottom to top. The outer diameter of the drill bit 8 should be consistent with the drill rod and smaller than the wellbore size. Each blade wing 84 is provided with a back-scoring tooth. The smaller outer diameter of the drill bit 8 effectively prevents suction when rapid extraction of drilling fluid is required during cement slurry injection. The back-scoring structure of the blade wing 84 also facilitates removal of the drill bit 8 if it is not promptly removed from the cemented well bottom 9.

[0103] Furthermore, the present application also provides a dual hydraulic continuous plugging drilling method, which utilizes the above-mentioned tool to perform the operation. The specific construction method includes the following steps:

[0104] Step 1: calibrate the first-stage throttling and second-stage throttling pressure differences of the cutter block opening monitoring mechanism at the wellhead; and test the opening and retraction functions of the cutter block 6 in the dual-hydraulic continuous leak plugging drilling multifunctional tool.

[0105] Step 2: Assemble the drill bit assembly and drill down the dual hydraulic (dual hydraulic continuous plugging drilling multifunctional tool provided in this application) continuous plugging drilling multifunctional tool to the plugging target layer, and pull up several meters after probing the bottom.

[0106] 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 tool. After the cement slurry replacement operation is completed, pull the drill to a safe position.

[0107] Step 4: Start 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 completing the flushing operation.

[0108] Step 5: After the cement slurry has solidified, drill again with the dual hydraulic continuous plugging drilling multifunctional tool (i.e., when the cement slurry has solidified, drill again with the dual hydraulic continuous plugging drilling multifunctional tool provided by this application). Stop drilling after probing the top surface of the cement slurry, start the pump, and increase the displacement to the working displacement. Record the first pump pressure. The hydraulic force generated by the first-level throttling cavity pushes the drive sleeve 4 downward. The three corresponding push blocks 41 on the drive sleeve 4 open the cutter block 6. The drive sleeve 4 descends to the maximum stroke position. The pump pressure increases significantly, indicating that the touch head 32 enters the second-level throttling cavity of the drive sleeve 4. The cutter block 6 has been fully opened to the designed wellbore size. At this time, the cutter block 6 is limited and locked. The drilling parameters are adjusted to the working drilling pressure and speed, and drilling and plugging are started. The difference between the above-mentioned continuous plugging-drilling and plugging operation and the conventional plugging-drilling and plugging operation is that there is no need 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.

[0109] Step 6: After the plug is drilled, the drill is pulled out of the well bottom 9, 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 successful, the drilling parameters can be changed according to the drilled stratum to continue drilling.

[0110] 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 having to replace the drilling tool.

[0111] The entire tool utilizes dual hydraulic pressure to push out the cutter block 6. Its core design features a dual hydraulic telescopic and variable diameter structure centered around a throttle sleeve 2, a trigger rod 3, a trigger head 32, and a drive sleeve 4. The hydraulic action generated by active throttling allows the cutter block 6 to telescope and adjust, expanding the lead hole size of the drill bit 8 to the specified full hole size for plugging operations. The tool can switch between grouting and plugging operations simply by controlling the drilling displacement. This allows for continuous switching between grouting and plugging operations simply by controlling the drilling displacement, replacing conventional cement plugging operations with multiple plugging, plugging, and drilling operations in single or even multi-layer locations without having to drill. This simple and easy-to-implement tool, along with its accompanying plugging operation method, effectively shortens the plugging and drilling cycle, offering significant economic value.

[0112] The above is only an illustrative embodiment of the present application and is not intended to limit the scope of the present application. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present application shall fall within the scope of protection of the present application.

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 and 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 has 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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