A multifunctional screw drilling tool

Abstract

The invention discloses a multifunctional screw drill, which belongs to the technical field of oil drilling tools. It comprises a bypass valve assembly, an anti-slip assembly, a motor assembly, a universal shaft assembly, a transmission shaft assembly and a connecting assembly which are screwed in sequence from top to bottom, a rotating assembly is connected and installed on the connecting assembly, an adjusting assembly is slidably connected on the rotating assembly, a plurality of shunt holes and a plurality of flow conversion holes are provided on the rotating assembly, a shunt channel is formed between the rotating assembly and the adjusting assembly, a plurality of first drainage holes are connected and provided on the adjusting assembly, and a drainage channel connected to the flow conversion holes is provided on the adjusting assembly. When the feed speed of the screw drill and the drill bit of the invention is greater than the drilling speed, the drill bit and the transmission column slide upward relative to the rotating tube, the shunt hole is gradually blocked by the transmission column, the drilling fluid pressure gradually increases and impacts the transmission column, prompting the transmission column to move downward, the mud pump continuously delivers the drilling fluid, and the impact and rotation combined drilling is realized, thereby improving the drilling efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum drilling tools, and more specifically to a multifunctional screw drilling tool. Background Art

[0002] The screw drill is a volumetric downhole power motor powered by drilling fluid. It uses the pressure difference formed when the drilling fluid pumped out of the drilling pump flows through the motor inlet and outlet to drive the motor rotor to rotate, and drives the drill bit to rotate through its internal universal shaft and transmission shaft, converting the hydraulic power composed of the drilling fluid pressure difference and flow into mechanical power composed of torque and speed to drive the drill bit to rotate, thus becoming a downhole power drilling tool that drives the drill bit to rotate.

[0003] When drilling in hard formations, common screw drills usually excavate by rotating the drill bit, and the depth of the drill bit into the rock is shallow, which makes the efficiency of rock crushing in a single circle of the drill bit low, and the drilling efficiency is low. In view of this, we propose a multifunctional screw drill. Summary of the invention

[0004] The purpose of the present invention is to provide a multifunctional screw drill, which solves the technical problem in the prior art that the drill bit penetrates the rock at a shallow depth, resulting in low efficiency in rock crushing in a single circle of the drill bit and low drilling efficiency, and realizes the technical effect of impact drilling and improving drilling efficiency.

[0005] The embodiment of the present invention provides a multifunctional screw drill, comprising a bypass valve assembly, an anti-drop assembly, a motor assembly, a universal shaft assembly, a transmission shaft assembly and a connection assembly which are screwed in sequence from top to bottom, and the connection assembly is connected to a liquid outlet of the transmission shaft assembly;

[0006] The connecting component is connected and installed with a rotating component, the rotating component is slidably connected with an adjusting component, and the adjusting component is connected with the rotating component;

[0007] The rotating assembly is provided with a plurality of flow-dividing holes and a plurality of flow-converting holes, a flow-dividing channel is formed between the rotating assembly and the regulating assembly, and the flow-dividing holes and the flow-converting holes are both in communication with the flow-dividing channel;

[0008] The regulating component is provided with a plurality of first drainage holes, which are connected to the diversion holes;

[0009] The regulating component is provided with a drainage channel connected with the flow exchange hole for conveying the drilling fluid into the drill bit.

[0010] As an optional solution of the technical solution of the document of the present invention, the connecting assembly includes a connecting pipe and an elastic member, the connecting pipe is screwed and locked on the transmission shaft assembly, and the connecting pipe is connected to the liquid outlet of the transmission shaft assembly;

[0011] A fixing plate is fixedly installed in the connecting pipe, a supporting ring is fixedly installed on the connecting pipe, an energy storage box is slidably connected to the inner side of the connecting pipe, the inner side of the energy storage box is open, one end of the elastic member is fixedly connected to the fixing plate, and the other end is fixedly connected to the energy storage box, and a plurality of lower locking blocks are fixedly installed on the top of the energy storage box;

[0012] The rotating assembly comprises a rotating tube, the rotating tube is rotatably connected with the connecting tube and communicates with each other, and the energy storage box is movably connected with the rotating tube;

[0013] A top plate is fixedly mounted on the rotating tube, and the top plate abuts against the supporting ring;

[0014] A plurality of upper locking blocks are fixedly installed below the top plate, and the upper locking blocks and the lower locking blocks are staggered and inserted to limit the position;

[0015] The rotating tube is provided with a plurality of energy storage holes, which are communicated with the energy storage box.

[0016] As an optional solution of the technical solution of the document of the present invention, the bottom of the upper locking block and the top of the lower locking block are both arc-shaped, and the contact surface of the upper locking block and the lower locking block after being inserted is parallel to the axis of the connecting pipe.

[0017] By adopting the above technical solution, the lower locking block can be automatically plugged into the upper locking block, reducing the difficulty of plugging in. After the upper locking block and the lower locking block are plugged into each other, the contact surface between the two is a vertical surface, ensuring that the rotational thrust can be effectively transmitted to the rotating tube when the connecting tube rotates.

[0018] As an optional solution to the technical solution of the document of the present invention, a plurality of first drainage holes are provided on the connecting pipe, and a plurality of second drainage holes are provided on the side of the energy storage box away from the opening, the second drainage holes are connected to the corresponding first drainage holes, and are used to drain the drilling fluid in the energy storage box, and the height of the second drainage holes is greater than the height of the first drainage holes.

[0019] As an optional solution of the technical solution of the document of the present invention, the energy storage hole is located on the upper side of the diversion hole, the drainage channel is located on the lower side of the diversion hole, the fixed plate and the energy storage box are both located in the diversion channel, the fixed plate is located between the energy storage hole and the diversion hole, and the fixed plate is used to separate the diversion channel.

[0020] As an optional solution of the technical solution of the document of the present invention, the adjustment assembly includes a transmission column, the outer diameter of the transmission column is equal to the inner diameter of the rotating tube, and the transmission column is slidably connected to the rotating tube;

[0021] An adjusting pipe is fixedly installed on the transmission column, a plurality of the first drainage holes are connected and opened on the adjusting pipe, and the drainage channel is opened on the transmission column;

[0022] A connecting block is fixedly installed at the bottom of the transmission column, and the connecting block is used to fix the drill bit.

[0023] As an optional solution of the technical solution of the document of the present invention, the drainage channel includes a plurality of second drainage holes and guide groove holes, a plurality of second drainage holes are connected with the guide groove holes, and a plurality of second drainage holes are connected with corresponding exchange holes.

[0024] As an optional solution of the technical solution of the document of the present invention, the height of the first drainage hole is greater than the height of the diversion hole, and the height of the second drainage hole is greater than the height of the exchange hole.

[0025] By adopting the above technical solution, when the transmission column moves upward due to resistance, the continuous flow time of the drilling fluid can be increased, thereby performing drilling fluid jetting and pressure relief.

[0026] As an optional solution of the technical solution of the document of the present invention, a plurality of cleaning holes connected to the guide slot holes are opened at one end of the transmission column close to the connecting block.

[0027] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0028] 1. The mud pump of the present invention continuously provides and delivers drilling fluid, thereby driving the drill bit to continuously excavate. At the same time, the drilling equipment applies a feed pressure downward to the screw drill and the drill bit. When the feed speed is greater than the drilling speed, the drill bit and the transmission column slide upward relative to the rotating tube. As the transmission column moves upward, the diversion hole is gradually blocked by the transmission column, thereby gradually increasing the drilling fluid pressure and impacting the transmission column, causing the transmission column to move downward. The drilling equipment continues to apply pressure and cooperates with the mud pump to continuously deliver drilling fluid, thereby forming impact drilling driven by the transmission column, realizing impact and rotation combined drilling, and improving drilling efficiency.

[0029] 2. In the present invention, when the feed of the drill bit is blocked, the drilling fluid enters the energy storage box from the energy storage hole to store energy. Under the continuous pressure of the drilling fluid, the elastic member is compressed, and the energy storage box slides down under the inner wall guide of the connecting pipe through the first guide block, thereby disengaging the lower locking block from the upper locking block. Since the lower locking block and the upper locking block are disengaged from the limit, the connecting pipe and the rotating pipe are released from synchronous rotation, so that the motor assembly, the universal shaft assembly, the transmission shaft assembly and the connecting pipe are in an idling state, thereby unloading the torsional force transmitted by the drill bit, avoiding excessive torque from damaging the motor assembly and other components, effectively protecting the screw drilling tool, and increasing the service life of the screw drilling tool.

[0030] 3. In the present invention, as the pressure of the drilling fluid continues to increase, the supply pressure of the mud pump gradually increases until it reaches a set value, and the mud pump stops inputting drilling fluid to the screw drill, thereby realizing monitoring of the pressure of the drilling fluid.

[0031] 4. When the drilling fluid stops being transported, the continuous pressure on the elastic parts disappears, and the elastic parts drive the energy storage box to move upward and reset, so that the lower locking block is automatically plugged into the upper locking block again to limit the position. When driven next time, the rotating pipe can rotate with the connecting pipe again. After the energy storage box is reset, the second drainage hole is connected with the corresponding first drainage hole, so that the drilling fluid in the energy storage box is discharged into the wellbore annulus. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A cross-sectional view of a multifunctional screw drill disclosed in a preferred embodiment of the present invention;

[0033] Figure 2 A schematic diagram of the connection structure of a universal shaft assembly and a transmission shaft assembly of a multifunctional screw drill disclosed in a preferred embodiment of the present invention;

[0034] Figure 3 A schematic diagram of a drill bit connection structure of a multifunctional screw drill tool disclosed in a preferred embodiment of the present invention;

[0035] Figure 4 A multifunctional screw drill disclosed in a preferred embodiment of the present invention Figure 3 The enlarged structural diagram at A in the middle;

[0036] Figure 5 A cross-sectional view of a connection assembly of a multifunctional screw drill disclosed in a preferred embodiment of the present invention;

[0037] Figure 6 A schematic diagram of the connection structure of a connecting assembly and a rotating assembly of a multifunctional screw drill disclosed in a preferred embodiment of the present invention;

[0038] Figure 7 A schematic diagram of the connection between an upper locking block and a lower locking block of a multifunctional screw drill disclosed in a preferred embodiment of the present invention;

[0039] Figure 8 A schematic diagram of the flow direction of drilling fluid of a multifunctional screw drilling tool disclosed in a preferred embodiment of the present invention;

[0040] Fig. 9 A multifunctional screw drill disclosed in a preferred embodiment of the present invention Figure 3 The enlarged structural diagram at B in the middle;

[0041] Fig.10 A schematic diagram of the drill bit structure of a multifunctional screw drill tool disclosed in a preferred embodiment of the present invention;

[0042] Fig.11 A multifunctional screw drill disclosed in a preferred embodiment of the present invention Figure 1 The enlarged structural diagram at C in the middle;

[0043] Fig.12 A multifunctional screw drill disclosed in a preferred embodiment of the present invention Figure 1 The enlarged structural diagram at D in the middle;

[0044] Fig.13 A multifunctional screw drill disclosed in a preferred embodiment of the present invention Figure 1 The enlarged structural diagram at E in the middle;

[0045] Fig.14 A multifunctional screw drill disclosed in a preferred embodiment of the present invention Figure 1 The enlarged structural diagram at F in the middle;

[0046] Fig.15 A multifunctional screw drill disclosed in a preferred embodiment of the present invention Figure 1 The enlarged structural diagram at G in the middle;

[0047] Fig.16 A multifunctional screw drill disclosed in a preferred embodiment of the present invention Figure 2 Enlarged structural diagram at H in the middle.

[0048] Explanation of the numbers in the figure: 1. Bypass valve assembly; 2. Anti-drop assembly; 3. Motor assembly; 4. Universal shaft assembly; 5. Transmission shaft assembly; 6. Connecting assembly; 7. Rotating assembly; 8. Adjusting assembly; 9. Diverter hole; 10. Conversion hole; 11. Diverter channel; 12. First drainage hole; 13. Second drainage hole; 14. Guide slot hole; 15. Drill bit; 16. Rotating ring; 17. Spring pin; 18. Third drainage hole; 19. Spray hole; 61. Connecting pipe; 62. Taper threaded platform; 63. Water inlet hole; 64. First Drainage hole; 65, support ring; 66, bearing; 67, through hole; 68, first guide groove; 69, energy storage box; 71, rotating tube; 72, pressure ring; 73, top plate; 74, upper locking block; 75, energy storage hole; 76, second guide groove; 81, transmission column; 82, adjustment tube; 83, connecting block; 84, tapered thread groove; 85, limit groove; 86, limit hole; 87, cleaning hole; 611, fixing plate; 612, elastic member; 691, first guide block; 692, lower locking block; 693, second drainage hole. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] Reference Figures 1 to 7 , Figures 11 to 16 The present embodiment discloses a multifunctional screw drill, including a bypass valve assembly 1, an anti-slip assembly 2, a motor assembly 3, a universal shaft assembly 4, a transmission shaft assembly 5 and a connection assembly 6 which are threadedly connected in sequence from top to bottom. The structures of the bypass valve assembly 1, the anti-slip assembly 2, the motor assembly 3, the universal shaft assembly 4 and the transmission shaft assembly 5 and the mutual connection and communication method are prior arts and will not be elaborated herein.

[0051] The connecting assembly 6 includes a connecting tube 61, a fixing plate 611 is fixedly installed in the connecting tube 61, an elastic member 612 is arranged on the upper side of the fixing plate 611, a tapered threaded platform 62 is fixedly installed on the connecting tube 61, and the connecting tube 61 is thread-locked with the transmission shaft assembly 5 through the tapered threaded platform 62. The setting of the tapered thread can effectively increase the locking effect of the connecting assembly 6 and the transmission shaft assembly 5, ensure that the two can effectively transmit and reduce the risk of falling off. The tapered threaded platform 62 is provided with a hole connected to the inside of the connecting tube 61. The water inlet hole 63 is connected with the water outlet of the transmission shaft assembly 5 after the connecting pipe 61 is locked with the transmission shaft assembly 5. A plurality of first drainage holes 64 are provided on the connecting pipe 61. A support ring 65 is fixedly installed on the connecting pipe 61. A bearing 66 is fitted in the connecting pipe 61. The top of the outer ring of the bearing 66 is against the bottom of the tapered threaded platform 62. The bottom of the outer ring of the bearing 66 is supported on the support ring 65. A through hole 67 is provided on the connecting pipe 61. The inner diameter of the through hole 67 is smaller than the inner diameter of the connecting pipe 61.

[0052] A first guide groove 68 is provided in the connecting pipe 61, and the connecting assembly 6 also includes an energy storage box 69, the inner side (the side with a smaller inner diameter) of the energy storage box 69 is open, one end of the elastic member 612 is fixedly connected to the fixing plate 611, and the other end is fixedly connected to the bottom of the energy storage box 69, a plurality of first guide blocks 691 are fixedly installed on the energy storage box 69, the first guide blocks 691 are slidably matched with the first guide groove 68, a plurality of lower locking blocks 692 are fixedly installed on the top of the energy storage box 69, a plurality of second drainage holes 693 are provided on the side of the energy storage box 69 away from the opening, the second drainage holes 693 are connected to the corresponding first drainage holes 64, and are used to discharge the drilling fluid in the energy storage box 69, and the height of the second drainage holes 693 is higher than the height of the first drainage holes 64.

[0053] It should be noted that in order to prevent the drilling fluid and mud in the wellbore annulus from flowing back into the first drainage hole 64, a filter plate is fixedly installed at the outlet of the first drainage hole 64 to prevent the mud from flowing back and blocking the first drainage hole 64. At the same time, a reverse flow valve is set in the first drainage hole 64. The reverse flow valve is located between the filter plate and the energy storage box 69. The setting of the reverse flow valve effectively ensures that the drilling fluid can only flow into the wellbore annulus from the energy storage box 69.

[0054] Reference Figure 3 , Figures 5 to 9The inner ring of the bearing 66 is equipped with a rotating assembly 7, which includes a rotating tube 71. The axes of the connecting tube 61 and the rotating tube 71 are in a colinear relationship. The rotating tube 71 is fitted on the inner side of the energy storage box 69 to realize the movable connection between the rotating tube 71 and the energy storage box 69. The rotating tube 71 is rotatably matched with the fixed plate 611. The rotating tube 71 rotates in the through hole 67. A pressure ring 72 and a top plate 73 are fixedly installed on the rotating tube 71. The pressure ring 72 abuts against the top of the inner ring of the bearing 66, and the top plate 73 abuts against the bottom of the inner ring of the bearing 66. The rotating tube 71 is rotatably connected to the connecting tube 61 through the bearing 66. The bottom of the top plate 73 is supported on the support ring 65 and can rotate relative to the support ring 65. The bottom of the top plate 73 is fixed A plurality of upper locking blocks 74 are installed, and the upper locking blocks 74 are arranged in an array, and the upper locking blocks 74 and the lower locking blocks 692 are arranged alternately. The upper locking blocks 74 and the lower locking blocks 692 are plugged into a limit position to keep the rotating tube 71 rotating synchronously with the energy storage box 69 and the connecting tube 61. The bottom of the upper locking block 74 and the top of the lower locking block 692 are both arc-shaped, so that the lower locking block 692 can automatically plug into the upper locking block 74 to reduce the difficulty of plugging. After the upper locking block 74 and the lower locking block 692 are plugged into each other, the contact surface of the two is a vertical surface (parallel to the axis of the connecting tube 61), ensuring that the connecting tube 61 can effectively transmit the rotational thrust to the rotating tube 71 when it rotates. A plurality of energy storage holes 75 are opened on the rotating tube 71, and the energy storage holes 75 are connected to the energy storage box 69.

[0055] When the feed of the drill bit 15 is blocked, the drilling fluid enters the energy storage box 69 from the energy storage hole 75 to store energy. Under the continuous pressure of the drilling fluid, the energy storage box 69 compresses the elastic member 612, and the energy storage box 69 slides down under the inner wall guide of the connecting pipe 61 through the first guide block 691, thereby disengaging the lower locking block 692 from the upper locking block 74. Since the lower locking block 692 and the upper locking block 74 are disengaged from the limit, the connecting pipe 61 and the rotating pipe 71 are released from synchronous rotation, so that the motor assembly 3, the universal shaft assembly 4, the transmission shaft assembly 5 and the connecting pipe 61 are in an idling state, thereby realizing the unloading of the torsional force transmitted by the drill bit 15, avoiding the occurrence of excessive torque to damage the motor assembly 3, etc., effectively protecting the screw drilling tool and improving the service life of the screw drilling tool. As the pressure of the drilling fluid continues to increase, the supply pressure of the mud pump gradually increases until it reaches the set value, and the mud pump stops inputting drilling fluid to the screw drilling tool to realize the monitoring of the pressure of the drilling fluid.

[0056] When the drilling fluid stops being transported, the continuous pressure on the elastic members 612 disappears, and the elastic members 612 drive the energy storage box 69 to move upward and reset, so that the lower locking block 692 is automatically plugged into the upper locking block 74 again to limit the position. During the next drive, the rotating tube 71 can rotate again following the connecting tube 61. After the energy storage box 69 is reset, the second drainage hole 693 is connected to the corresponding first drainage hole 64, thereby discharging the drilling fluid in the energy storage box 69 into the wellbore annulus.

[0057] A plurality of diverter holes 9 and exchange holes 10 are provided on the rotating tube 71. The diverter holes 9 are located below the energy storage holes 75, and the exchange holes 10 are located below the diverter holes 9. A diverter channel 11 is formed between the rotating tube 71 and the connecting tube 61. The diverter holes 9 and the exchange holes 10 are both connected to the diverter channel 11. The fixed plate 611 is located in the diverter channel 11 and on the upper side of the diverter hole 9. The fixed plate 611 divides the diverter channel 11 into upper and lower sides. The drilling fluid flowing from the diverter hole 9 into the diverter channel 11 is blocked by the fixed plate 611. Therefore, the drilling fluid flows from the lower part of the diverter channel 11 and flows out from the exchange hole 10.

[0058] Reference Figure 4 , Figure 8 and Fig. 9 , a plurality of second guide grooves 76 are provided on the inner side of the rotating tube 71, and the screw drill also includes an adjusting assembly 8, which includes a transmission column 81, the outer diameter of the transmission column 81 is equal to the inner diameter of the rotating tube 71, the transmission column 81 is colinear with the axis of the rotating tube 71, a plurality of second guide blocks are fixedly installed on the transmission column 81, and the second guide blocks slide in cooperation with the second guide grooves 76, so as to realize the sliding of the transmission column 81 in the rotating tube 71, an adjusting tube 82 is fixedly installed on the transmission column 81, the outer diameter of the adjusting tube 82 is equal to the inner diameter of the rotating tube 71, the adjusting tube 82 is connected with the inside of the rotating tube 71, and a plurality of first drainage holes 12 are connected and provided on the adjusting tube 82, the height of the first drainage hole 12 is higher than the height of the diversion hole 9, a plurality of second drainage holes 13 and guide slot holes 14 are provided on the transmission column 81, and the plurality of second drainage holes 13 are all connected with the guide slot holes 14, the height of the second drainage holes 13 is higher than the height of the exchange hole 10, and the second drainage holes 13 are connected with the corresponding exchange hole 10. The drilling fluid flows from the exchange hole 10 into the corresponding second drainage hole 13 and flows from the guide groove hole 14 to the drill bit 15 and is ejected, thereby realizing the circulation of the drilling fluid. The height of the first drainage hole 12 is higher than the height of the diversion hole 9 and the height of the second drainage hole 13 is higher than the height of the exchange hole 10. When the transmission column 81 moves upward due to resistance, the continuous flow time of the drilling fluid can be increased, thereby performing drilling fluid injection pressure relief.

[0059] A connecting block 83 is fixedly installed at the bottom of the transmission column 81, and a tapered thread groove 84 is provided on the connecting block 83. The drill bit 15 is threadedly locked and fixed to the connecting block 83 through the tapered thread groove 84. There is a certain distance between the connecting block 83 and the bottom of the rotating tube 71, so as to ensure that the connecting block 83 can be adjusted within a certain range. A plurality of cleaning holes 87 connected to the guide groove hole 14 are provided at one end of the transmission column 81 close to the connecting block 83. When silt is blocked at the bottom of the transmission column 81, the drilling fluid is quickly ejected from the cleaning hole 87, thereby automatically cleaning the silt and reducing the risk of silt accumulation. The cleaning hole 87 is installed with a filter plate and a backflow valve that are the same as those in the first drainage hole 64 to avoid mud blockage or backflow.

[0060] During the drilling process, the mud pump continuously provides drilling fluid to drive the drill bit 15 to continue excavating. At the same time, the drilling equipment also provides a feed pressure downward to the screw drill and the drill bit 15. Therefore, the drill bit 15 and the transmission column 81 slide upward relative to the rotating tube 71. As the transmission column 81 moves upward, the diversion hole 9 is gradually blocked by the transmission column 81, thereby gradually increasing the drilling fluid pressure and impacting the transmission column 81, causing the transmission column 81 to move downward. The drilling equipment continues to apply pressure and cooperates with the mud pump to continuously deliver drilling fluid, thereby forming an impact drilling driven by the transmission column 81, realizing impact and rotation multifunctional combined drilling, and improving drilling efficiency.

[0061] Reference Figure 8 and Fig.10 The connecting block 83 is provided with a plurality of limiting grooves 85, and the connecting block 83 is provided with limiting holes 86 connected with the limiting grooves 85. The drill bit 15 is rotatably connected with a rotating ring 16, and a plurality of spring pins 17 are fixedly installed on the rotating ring 16. When the drill bit 15 is inserted into the tapered thread groove 84 and threadedly connected with the connecting block 83, the spring pins 17 are compressed and inserted into the limiting grooves 85. When the drill bit 15 rotates, the rotating ring 16 is limited in the limiting grooves 85 by the spring pins 17, and rotates relative to the drill bit 15. When the thread of the drill bit 15 is completely locked, the spring pins 17 are inserted into the limiting holes 86, so as to further limit and fix the drill bit 15. , improve the stability of the connection of the drill bit 15. After the drill bit 15 is connected, a blocking block is fixedly installed at the mouth of the limiting hole 86 to avoid the problem of mud pushing the spring pin 17 from the limiting hole 86, thereby reducing the risk of failure of the spring pin 17. A third drainage hole 18 is provided on the drill bit 15. A plurality of water spray holes 19 are connected to the third drainage hole 18. The water spray holes 19 are inclined downward. The water spray holes 19 and the cutter heads of the drill bit 15 are alternately distributed. When the drill bit 15 continues to excavate, the water spray holes 19 continue to spray out a mixture of drilling fluid and mud, thereby reducing the difficulty of drilling with the drill bit 15, improving the mixing effect of mud and drilling fluid, and facilitating the removal of mud from the annulus of the wellbore.

[0062] When a multifunctional screw drill tool disclosed in an embodiment of the present invention is used, the drilling fluid converts the liquid pressure energy into kinetic energy through the motor assembly 3 and transmits it to the connecting assembly 6 through the universal shaft assembly 4 and the transmission shaft assembly 5. The connecting assembly 6 drives the rotating assembly 7 to rotate through the first guide block 691, the energy storage box 69, the lower locking block 692, and the upper locking block 74. The rotating assembly 7 drives the adjusting assembly 8 to rotate through the second guide block on the transmission column 81, and the adjusting assembly 8 drives the drill bit 15 to rotate, thereby realizing the rotary drilling of the drill bit 15;

[0063] After the drilling fluid drives the rotor of the motor assembly 3 to rotate, it enters the water inlet hole 63 of the connecting assembly 6 through the universal shaft assembly 4 and the transmission shaft assembly 5. The drilling fluid enters the regulating pipe 82 from the water inlet hole 63 and pushes the transmission column 81 downward. The drilling fluid flows into the drill bit 15 through the regulating pipe 82, the first drainage hole 12, the diversion hole 9, the diversion channel 11, the exchange hole 10, the second drainage hole 13 and the guide slot hole 14 and is ejected, thereby achieving the mixing of the drilling fluid and the mud.

[0064] While the mud pump continuously delivers drilling fluid, the drilling equipment provides a feed pressure drop force to the screw drill, thereby making the drill bit 15 contact the bottom of the well. When the drill bit 15 fails to drill effectively, the drill bit 15 drives the transmission column 81 to slide upward relative to the rotating tube 71, thereby reducing the effective flow diameter of the diversion hole 9 and reducing the outflow of the drilling fluid. The mud pump still continuously delivers drilling fluid to the inside of the threaded drill, causing the drilling fluid pressure in the threaded drill to increase, continuously impacting the transmission column 81, forcing the transmission column 81 to drive the drill bit 15 to move downward for drilling, thereby achieving continuous impact drilling.

[0065] When the continuous feed pressure drop force and the impact force of the drilling fluid cannot drive the drill bit 15 to drill, the diversion hole 9 is blocked by the transmission column 81, the fluid supply pressure of the mud pump gradually increases, the first drainage hole 12 is connected with the energy storage hole 75, and the drilling fluid enters the energy storage box 69 from the energy storage hole 75 to store energy. Under the continuous pressure of the drilling fluid, the energy storage box 69 compresses the elastic member 612, and the energy storage box 69 slides down the inner wall guide of the connecting pipe 61 through the first guide block 691, thereby disengaging the lower locking block 692 from the upper locking block 74. Because the lower locking block 692 and the upper locking block 74 are disengaged from the limit, the connecting pipe 61 and the rotating pipe 71 are released from synchronous rotation, and the motor assembly 3, the universal shaft assembly 4, the transmission shaft assembly 5 and the connecting pipe 61 are in an idling state, thereby realizing the unloading of the feed torque force transmitted by the drill bit 15, and avoiding excessive torque from damaging the motor assembly 3;

[0066] As the pressure of the drilling fluid continues to increase, the supply pressure of the mud pump increases to the set value, and the mud pump stops inputting drilling fluid to the screw drill. The continuous pressure on the elastic members 612 disappears, and the elastic members 612 drive the energy storage box 69 to move up and reset, so that the lower locking block 692 is automatically plugged into the upper locking block 74 again. When driven next time, the rotating tube 71 can rotate with the connecting tube 61 again. After the energy storage box 69 is reset, the second drainage hole 693 is connected with the corresponding first drainage hole 64, so that the drilling fluid in the energy storage box 69 is discharged into the wellbore annulus.

[0067] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A multifunctional screw drill, characterized in that: It comprises a bypass valve assembly (1), an anti-drop assembly (2), a motor assembly (3), a universal shaft assembly (4), a transmission shaft assembly (5) and a connecting assembly (6) which are screwed in sequence from top to bottom, and the connecting assembly (6) is connected to the liquid outlet of the transmission shaft assembly (5); The connecting component (6) is connected to a rotating component (7) and is mounted thereon. The rotating component (7) is slidably connected to an adjusting component (8), and the adjusting component (8) is connected to the rotating component (7). The rotating assembly (7) is provided with a plurality of flow-dividing holes (9) and a plurality of flow-converting holes (10); a flow-dividing channel (11) is formed between the rotating assembly (7) and the regulating assembly (8); and the flow-dividing holes (9) and the flow-converting holes (10) are both in communication with the flow-dividing channel (11); The regulating component (8) is provided with a plurality of first drainage holes (12) in communication, and the first drainage holes (12) are in communication with the diversion holes (9); The regulating assembly (8) is provided with a drainage channel connected to the flow exchange hole (10) for conveying drilling fluid into the drill bit (15); The connecting assembly (6) comprises a connecting tube (61) and an elastic member (612); a fixing plate (611) is fixedly mounted inside the connecting tube (61); a supporting ring (65) is fixedly mounted on the connecting tube (61); an energy storage box (69) is slidably connected to the inner side of the connecting tube (61); the inner side of the energy storage box (69) is open; one end of the elastic member (612) is fixedly connected to the fixing plate (611) and the other end is fixedly connected to the energy storage box (69); and a plurality of lower locking blocks (692) are fixedly mounted on the top of the energy storage box (69); The rotating assembly (7) comprises a rotating tube (71), the rotating tube (71) and the connecting tube (61) are rotatably connected and communicate with each other, and the energy storage box (69) is movably connected to the rotating tube (71); A top plate (73) is fixedly mounted on the rotating tube (71), and the top plate (73) abuts against the supporting ring (65); A plurality of upper locking blocks (74) are fixedly mounted below the top plate (73), and the upper locking blocks (74) and the lower locking blocks (692) are interlaced and inserted to limit positions; The rotating tube (71) is provided with a plurality of energy storage holes (75), and the energy storage holes (75) are in communication with the energy storage box (69); The connecting pipe (61) is provided with a plurality of first drainage holes (64), and the energy storage box (69) is provided with a plurality of second drainage holes (693) on a side away from the opening, wherein the second drainage holes (693) are connected to the corresponding first drainage holes (64) and are used to drain the drilling fluid in the energy storage box (69); The energy storage hole (75) is located on the upper side of the diversion hole (9), the drainage channel is located on the lower side of the diversion hole (9), the fixing plate (611) and the energy storage box (69) are both located in the diversion channel (11), the fixing plate (611) is located between the energy storage hole (75) and the diversion hole (9), and the fixing plate (611) is used to separate the diversion channel (11); The adjustment assembly (8) comprises a transmission column (81), the outer diameter of the transmission column (81) is equal to the inner diameter of the rotating tube (71), and the transmission column (81) is slidably connected to the rotating tube (71); An adjusting pipe (82) is fixedly mounted on the transmission column (81); a plurality of the first drainage holes (12) are connected and opened on the adjusting pipe (82); and the drainage channel is opened on the transmission column (81).

2. A multifunctional screw drill according to claim 1, characterized in that: The connecting pipe (61) is screwed and locked onto the transmission shaft assembly (5), and the connecting pipe (61) is in communication with a liquid outlet of the transmission shaft assembly (5).

3. A multifunctional screw drill according to claim 2, characterized in that: The bottom of the upper locking block (74) and the top of the lower locking block (692) are both arc-shaped, and the contact surface of the upper locking block (74) and the lower locking block (692) after being inserted into each other is parallel to the axis of the connecting pipe (61).

4. A multifunctional screw drill according to claim 2, characterized in that: The height of the second drainage hole (693) is greater than the height of the first drainage hole (64).

5. The multifunctional screw drill according to claim 2, characterized in that: A connecting block (83) is fixedly mounted on the bottom of the transmission column (81), and the connecting block (83) is used to fix the drill bit (15).

6. A multifunctional screw drill according to any one of claims 1 to 5, characterized in that: The drainage channel comprises a plurality of second drainage holes (13) and guide slot holes (14); the plurality of second drainage holes (13) are in communication with the guide slot holes (14); and the plurality of second drainage holes (13) are in communication with corresponding flow exchange holes (10).

7. A multifunctional screw drill according to claim 6, characterized in that: The height of the first drainage hole (12) is greater than the height of the diversion hole (9), and the height of the second drainage hole (13) is greater than the height of the exchange hole (10).

8. The multifunctional screw drill according to claim 5, characterized in that: A plurality of cleaning holes (87) communicating with the guide slot holes (14) are formed at one end of the transmission column (81) close to the connection block (83).

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