An impact rotary drill

Abstract

The present invention provides an impact rotary drilling tool, which includes a coiled tubing. A primary housing is provided at the lower end of the coiled tubing. A sealing bearing is connected to the lower end of the primary housing. A secondary drive assembly is connected to the lower end of the sealing bearing. An impactor is connected to the lower end of the secondary drive assembly. A rotary assembly for driving the impactor to reciprocate and rotate is provided in the primary housing, and the rotary assembly is driven by high-pressure fluid. In the present invention, the provided rotary assembly can drive the secondary drive assembly to reciprocate and rotate, and the reciprocating rotation of the secondary drive assembly can drive the impactor to reciprocate and rotate, thereby realizing the rotary operation. It is not necessary to use a drill pipe to achieve rotation, reducing the energy consumption during the drilling process. By lowering the impact rotary drilling tool through the coiled tubing, the time for unscrewing and screwing the drill pipe can be reduced, effectively improving the drilling efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of drilling tools, and particularly relates to an impact rotary drilling tool. Background Art

[0002] As an auxiliary rock-breaking tool, the impactor is widely used in the fields of mineral resource exploration and development, large-scale infrastructure construction, etc. When drilling in hard rock, the impact rotary drilling tool can effectively improve the drilling efficiency and the core recovery rate. The commonly used impact rotary drilling tools include pneumatic down-the-hole hammers and hydraulic impactors. Compared with pneumatic down-the-hole hammers, hydraulic impactors have the advantages of low energy consumption and cleanliness. However, the existing pneumatic down-the-hole hammers and hydraulic impactors generally only have an impact function, and their rotary function is realized through the rotation of the drill pipe, and the energy consumed for rotary drilling is relatively large. Summary of the Invention

[0003] The purpose of the present invention is to provide an impact rotary drilling tool with a rotary function and high drilling efficiency.

[0004] To achieve the above object, the present invention provides an impact rotary drilling tool, including a coiled tubing. A primary housing is provided at the lower end of the coiled tubing. A sealing bearing is connected to the lower end of the primary housing. A secondary drive assembly is connected to the lower end of the sealing bearing. An impactor is connected to the lower end of the secondary drive assembly. A rotary assembly for driving the impactor to reciprocate and rotate is provided in the primary housing, and the rotary assembly is driven by high-pressure fluid.

[0005] Further, the upper end of the primary housing is connected to the coiled tubing through a primary upper connector, and the lower end of the primary housing is connected to the sealing bearing through a primary lower connector.

[0006] Further, the rotary assembly includes a primary drive shaft. The primary drive shaft is provided with a fluid passage in the axial direction. The upper part of the primary drive shaft passes through the primary upper connector and is in fit with it, and a sliding pair is formed between the primary drive shaft and the primary upper connector. The lower part of the primary drive shaft passes through the primary lower connector. A first elastic member is provided between the lower end face of the middle part of the primary drive shaft and the primary lower connector. The side wall of the middle part of the primary drive shaft is in fit with the inner wall of the primary housing. A flow distribution hole is provided below the side wall of the upper part of the primary drive shaft. A pressure relief hole is provided on the side wall of the primary housing. An overflow hole is opened below the pressure relief hole on the side wall of the primary housing. A spiral drive groove is provided on the side wall of the lower end of the primary drive shaft. A drive column is connected to the inner side of the sealing bearing, and one end of the drive column is located in the spiral drive groove.

[0007] Further, the secondary drive assembly includes a secondary housing. The upper end of the secondary housing is connected to the lower end of the sealed bearing through a secondary upper connector. The lower end of the secondary housing is connected to the impactor through a secondary lower connector. The secondary upper connector is axially provided with a plurality of fluid flow channels. A secondary drive shaft is provided inside the secondary housing. A drain channel is provided at the lower end of the secondary drive shaft. The upper part of the secondary drive shaft passes through the secondary upper connector and is arranged in contact therewith. The lower part of the secondary drive shaft passes through the secondary lower connector. The side wall in the middle of the secondary drive shaft is arranged in contact with the secondary housing. A second elastic member is arranged between the lower end of the middle part of the secondary drive shaft and the secondary lower connector.

[0008] Further, the impactor includes an impact housing. The upper end of the impact housing is connected to the secondary lower connector. An impact support is connected to the lower end of the impact housing. A drill bit is inserted into the lower end of the impact support. A liquid flow channel is axially provided in the drill bit. An impact gland is provided at the upper end of the drill bit. A sliding pair is formed between the impact gland and the impact support. A third elastic member is arranged between the impact gland and the impact support.

[0009] Further, the sealed bearing includes an upper support and a lower support. The upper support is connected to the primary lower connector. An inner boss is provided at the lower end inside the upper support. The upper part of the lower support is located inside the upper support. An upper gland is sleeved on the upper part of the lower support. A plurality of upper ball bearings are arranged between the lower end of the upper gland and the inner boss. A plurality of lower ball bearings are arranged between the lower end of the upper support and the lower support. An installation hole for installing a drive column is provided in the side wall of the lower support. The drive column is inserted into the installation hole.

[0010] Further, a primary positioner is arranged between the coiled tubing and the primary housing. The primary positioner includes a fixed support. The fixed support is sleeved on the primary upper connector. A plurality of positioning rods are circumferentially distributed on the side wall of the fixed support. One end of the positioning rod is connected to the fixed support. The other end of the positioning rod is connected to a positioning plate through a connecting block.

[0011] Further, a secondary positioner is arranged between the primary housing and the sealed bearing. The secondary positioner has the same structure as the primary positioner.

[0012] Further, the number of the positioning rods is four, and the included angle between the midlines of two adjacent positioning rods of the primary positioner and the secondary positioner is 45°.

[0013] Further, the positioning rod is threadedly connected to the fixed support.

[0014] The advantages of the present invention are as follows: The percussion rotary drill provided by the present invention can drive the secondary drive assembly to rotate reciprocally through the provided rotary assembly. The reciprocating rotation of the secondary drive assembly can drive the impactor to rotate reciprocally, thereby realizing the rotary operation. Compared with the prior art, it does not need to realize rotation through the drill pipe, reducing the energy consumption during the drilling process. By lowering the percussion rotary drill through the coiled tubing, the time for unscrewing and screwing the drill pipe can be reduced, effectively improving the drilling efficiency.

[0015] The following will describe the present invention in detail with reference to the accompanying drawings and embodiments. Brief Description of the Drawings

[0016] Figure 1 is the internal structural schematic diagram when the primary drive shaft of the present invention descends to the lowest end and the drill bit performs percussion work.

[0017] Figure 2 is the internal structural schematic diagram when the primary drive shaft and the drill bit of the present invention are in the initial state.

[0018] Figure 3 is the top view of the present invention.

[0019] Figure 4 is the structural schematic diagram of the primary drive shaft.

[0020] Figure 5 is the structural schematic diagram of the secondary drive shaft.

[0021] Figure 6 is the structural schematic diagram of the drill bit.

[0022] Figure 7 is Figure 1 the enlarged schematic diagram at position A in

[0023] Figure 8 is Figure 1 the enlarged schematic diagram at position B in

[0024] Figure 9 is Figure 2 the cross-sectional view taken along line A - A in

[0025] Description of the reference numerals: 1. coiled tubing; 2. primary housing; 3. sealed bearing; 301. upper support; 302. lower support; 303. inner boss; 304. upper gland; 305. upper ball; 306. lower ball; 307. bearing seal ring; 308. upper ball retainer; 309. lower ball retainer; 4. secondary drive assembly; 401. secondary housing; 402. secondary upper connector; 403. secondary lower connector; 404. fluid flow channel; 405. secondary drive shaft; 406. bleed channel; 407. second elastic member; 408. secondary upper seal ring; 409. secondary middle seal ring; 5. impactor; 501. impact housing; 502. impact support; 503. drill bit; 504. fluid flow channel; 505. impact gland; 506. third elastic member; 507. impact seal ring; 508. second guide boss; 509. second guide groove; 6. rotary assembly; 601. primary drive shaft; 602. fluid channel; 603. first elastic member; 604. flow distribution hole; 605. pressure relief hole; 606. overflow hole; 607. spiral drive groove; 608. drive post; 609. primary upper seal ring; 610. primary middle seal ring; 611. primary lower seal ring; 612. first guide boss; 613. first guide groove; 7. primary upper connector; 8. primary lower connector; 9. primary locator; 901. fixed support; 902. positioning rod; 903. connecting block; 904. positioning plate; 10. secondary locator. Detailed implementation manners

[0026] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined purpose, the following describes in detail the specific implementation manners, structural features and their effects of the present invention in combination with the drawings and embodiments.

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0028] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "aligned", "overlapped", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0029] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features; in the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0030] Embodiment 1

[0031] This embodiment provides an impact rotary drill as shown in Figures 1 to 3 Figure [not shown]. It includes a coiled tubing 1. During use, the coiled tubing 1 is lowered by an LG360 / 60T coiled tubing workover rig. The up and down movement of the coiled tubing 1 is adjusted by the winding and unwinding of the coiled tubing workover rig, thereby adjusting the working height of the drill. At the other end of the coiled tubing workover rig, the coiled tubing 1 is connected to a high-pressure fluid generating device. Specifically, the high-pressure fluid generating device can be an F1300 type mud pump or an RM75ie type air compressor. A primary housing 2 is provided at the lower end of the coiled tubing 1. A sealed bearing 3 is connected to the lower end of the primary housing 2. A secondary drive assembly 4 is connected to the lower end of the sealed bearing 3. An impactor 5 is connected to the lower end of the secondary drive assembly 4. A rotary assembly 6 for driving the impactor 5 to reciprocate and rotate is provided inside the primary housing 2. The rotary assembly 6 is driven by high-pressure fluid, and the fluid can be water, drilling fluid, compressed air, etc.

[0032] Furthermore, as shown in Figure 1 and Figure 2 Figure [not shown], the upper end of the primary housing 2 and the coiled tubing 1 are connected by a primary upper connector 7. The connection here is preferably a threaded connection. The lower end of the primary housing 2 and the sealed bearing 3 are connected by a primary lower connector 8. The connection here is preferably a threaded connection, which facilitates disassembly and assembly.

[0033] Furthermore, as shown in Figures 1 to 4As shown, the slewing assembly 6 includes a primary drive shaft 601. Specifically, the primary drive shaft 601 has a cross-shaped structure. The primary drive shaft 601 is provided with a fluid passage 602 in the axial direction. The upper part of the primary drive shaft 601 passes through the primary upper connector 7 and is arranged in contact therewith. Specifically, a set of primary upper sealing grooves are provided on the upper side wall of the primary drive shaft 601, and a primary upper sealing ring 609 is arranged in the primary upper sealing grooves. The sealing performance of the connection can be enhanced through the primary upper sealing ring 609. Moreover, a sliding pair is formed between the primary drive shaft 601 and the primary upper connector 7. Specifically, a first guiding boss 612 is provided on the top side wall of the primary drive shaft 601, and a first guiding groove 613 is provided inside the primary upper connector 7. The arranged first guiding boss 612 and the first guiding groove 613 cooperate to restrict the self-rotation of the primary drive shaft 601 and ensure the axial movement of the primary drive shaft 601. The lower part of the primary drive shaft 601 passes through the primary lower connector 8 and is arranged in contact therewith. Specifically, a set of primary lower sealing grooves are provided on the side wall of the lower part of the primary drive shaft 601, and a primary lower sealing ring 611 is arranged in the primary lower sealing grooves. The side wall of the middle part of the primary drive shaft 601 is in contact with the inner wall of the primary housing 2. Specifically, a set of primary middle sealing grooves are provided on the side wall of the middle part of the primary drive shaft 601, and a primary middle sealing ring 610 is arranged in the primary middle sealing grooves, thereby improving the airtightness of the connection. A first elastic member 603 is arranged between the lower end face of the middle part of the primary drive shaft 601 and the primary lower connector 8. Specifically, the first elastic member 603 is a spring. An installation groove is provided on the lower end face of the middle part of the primary drive shaft 601, thereby restricting the radial displacement of the spring. The upper end of the spring is connected to the installation groove, and the lower end of the spring is connected to the primary lower connector 8.

[0034] As Figure 1 and Figure 4 shown, a flow distribution hole 604 is provided below the upper side wall of the primary drive shaft 601 for distributing high-pressure fluid to the primary drive shaft 601 to drive the movement of the primary drive shaft 601. A pressure relief hole 605 is provided on the side wall of the primary housing 2, and an overflow hole 606 is provided on the side wall of the primary housing 2 below the pressure relief hole 605. The pressure relief hole 605 and the overflow hole 606 are used to connect the inside and the outside space of the primary housing 2. When the primary middle sealing ring 610 moves downward to the lower part of the pressure relief hole 605, the fluid in the upper part of the primary housing 2 is discharged to the outside of the primary housing 2. At this time, the acting force generated by the upper fluid is less than the elastic force of the first elastic member 603, and the first elastic member 603 provides upward power to drive the upward movement of the primary drive shaft 601. The fluid in the upper part of the primary housing 2 is discharged to the outside of the primary housing 2. When the primary drive shaft 601 moves upward, the fluid flows into the primary housing 2 through the overflow hole 606. When the primary drive shaft 601 moves downward, the fluid flows out of the inside of the primary housing 2 through the overflow hole 606.

[0035] As Figure 1 and Figure 4As shown, a spiral drive groove 607 is provided on the side wall at the lower end of the primary drive shaft 601. A drive post 608 is connected to the inside of the seal bearing 3. One end of the drive post 608 is located within the spiral drive groove 607. The spiral drive groove 607 cooperates with the drive post 608 to drive the lower part of the seal bearing 3 to rotate when the primary drive shaft 601 moves up and down.

[0036] Further, as Figure 1 and Figure 7 shown, the seal bearing 3 includes an upper support 301 and a lower support 302. The upper support 301 is connected to the primary lower connector 8. Preferably, the connection here is a threaded connection, which is convenient for disassembly and assembly. An inner boss 303 is provided at the lower end inside the upper support 301. An installation hole for installing the drive post 608 is provided in the side wall of the lower part of the lower support 302. The drive post 608 is inserted into the installation hole. Specifically, the number of installation holes is two, and the two installation holes are located on the left and right sides of the lower support 302. One end of the drive post 608 is fixed in the installation hole.

[0037] As Figure 1 and Figure 7 shown, the upper part of the lower support 302 passes through the central through hole of the upper support 301 and is placed inside the upper support 301. A set of seal grooves is provided on the side wall of the upper part of the lower support 302. A bearing seal ring 307 is provided in the seal grooves. An upper gland 304 is sleeved on the upper part of the lower support 302. Specifically, the lower support 302 and the upper gland 304 are in threaded connection. An upper ball limiting frame 308 and a number of upper balls 305 are provided between the lower end of the upper gland 304 and the inner boss 303. An annular groove is provided in the upper part of the inner boss 303, and an annular groove is provided in the lower part of the upper gland 304. The upper balls 305 pass through the upper ball limiting frame 308. The upper part of the upper balls 305 contacts the annular groove in the lower part of the upper gland 304, the middle part contacts the upper ball limiting frame 308, and the lower part contacts the annular groove in the upper part of the inner boss 303 to ensure that the lower support 302 makes a rotary motion. The provided upper ball limiting frame 308 can limit the relative positions between adjacent two upper balls 305, so that the upper balls 305 are evenly distributed on the circumference; a lower ball limiting frame 309 and a number of lower balls 306 are provided between the lower end of the upper support 301 and the lower support 302. An annular groove is provided in the lower part of the inner boss 303, and an annular groove is provided in the upper part of the lower support 302. The upper part of the lower balls 306 contacts the annular groove in the lower part of the inner boss 303 of the upper support 301, the middle part contacts the lower ball limiting frame 309, and the lower part contacts the annular groove in the upper part of the lower support 302 to ensure that the lower support 302 makes a rotary motion.

[0038] Further, as Figure 1 and Figure 2As shown, the secondary drive assembly 4 includes a secondary housing 401. The upper end of the secondary housing 401 is connected to the lower end of the seal bearing 3 through a secondary upper connector 402. Specifically, the connection here is a threaded connection. The lower end of the secondary housing 401 is connected to the impactor 5 through a secondary lower connector 403. Specifically, the connection here is a threaded connection, which facilitates disassembly and assembly. The secondary upper connector 402 is axially provided with a plurality of fluid flow channels 404. Preferably, the number of fluid flow channels 404 is 6 and they are distributed in a circumferential array. A secondary drive shaft 405 is provided in the secondary housing 401. Specifically, as Figure 5 shown, the secondary drive shaft 405 is integrally cross-shaped. A drain channel 406 is provided at the lower end of the secondary drive shaft 405. Specifically, the drain channel 406 is a T-shaped channel, and the horizontal channel of the T-shaped channel is located in the upper part of the secondary drive shaft 405.

[0039] As Figure 1 , Figure 2 and Figure 8 shown, the upper part of the secondary drive shaft 405 passes through the secondary upper connector 402 and is arranged in contact therewith. Specifically, two sets of secondary upper seal grooves are provided on the side wall of the upper part of the secondary drive shaft 405. The two sets of secondary upper seal grooves are respectively located on the upper and lower sides of the horizontal channel. A secondary upper seal ring 408 is provided in the secondary upper seal groove; the lower part of the secondary drive shaft 405 passes through the secondary lower connector 403. The side wall of the middle part of the secondary drive shaft 405 is arranged in contact with the secondary housing 401. Specifically, a set of secondary middle seal grooves is provided on the side wall of the middle part of the secondary drive shaft 405. A secondary middle seal ring 409 is provided in the secondary middle seal groove, thereby improving the airtight effect; a second elastic member 407 is provided between the lower end of the middle part of the secondary drive shaft 405 and the secondary lower connector 403. Specifically, the second elastic member 407 is a spring. An installation groove is provided at the lower end of the middle part of the secondary drive shaft 405. The upper part of the spring is connected to the installation groove, and the lower part of the spring is connected to the secondary lower connector 403.

[0040] When the percussion rotary drill tool does not perform the percussion function, the second elastic member 407 supports the secondary drive shaft 405 to keep the secondary drive shaft 405 in the initial position. When the percussion rotary drill tool performs the percussion function, high-pressure fluid is delivered to the inside of the secondary housing 401 through the fluid flow channel 404 of the secondary upper connector 402. Since there is no fluid flow channel at this time, a huge water hammer pressure will be generated on the upper part of the secondary drive shaft 405, driving the secondary drive shaft 405 to move downward. When the secondary drive shaft 405 moves downward, the secondary drive shaft 405 contacts the drill bit 503 of the impactor 5, causing the drill bit 503 of the impactor 5 to move downward. When the secondary drive shaft 405 moves to the lowest position, the T-shaped drainage channel 406 moves to the lower part of the secondary upper connector 402, and the high-pressure fluid in the secondary housing 401 is delivered to the outside of the vibration device through the T-shaped drainage channel 406. At this time, the upward acting force generated by the second elastic member 407 is greater than the downward acting force generated by the fluid on the upper part of the secondary drive shaft 405, driving the secondary drive shaft 405 to move upward. The periodic upward and downward movement of the secondary drive shaft 405 generates a periodic impact on the drill bit 503 of the impactor 5, causing the drill bit 503 of the impactor 5 to perform impact rock breaking.

[0041] Further, as Figure 1 , Figure 6 and Figure 9 shown, the impactor 5 includes an impact housing 501. The upper end of the impact housing 501 is connected to the secondary lower connector 403. Specifically, the connection here is a threaded connection. The lower end of the impact housing 501 is connected with an impact support 502. Here, it can be a threaded connection or a welding method. The lower end of the impact support 502 is inserted with a drill bit 503. Specifically, a set of impact sealing rings 507 is provided in the middle of the drill bit 503. The outer side of the impact sealing ring 507 is fitted with the impact support 502 to improve the tightness and separate the inside of the drill tool from the external drilling fluid. The drill bit 503 is axially provided with a fluid flow channel 504. The fluid flow channel 504 not only has the effect of pressure relief, but also has the effect of cooling the drill bit 503. Specifically, the fluid flow channel 504 is a branched channel. The upper end of the drill bit 503 is provided with an impact gland 505. Specifically, the impact gland 505 is threadedly connected with the drill bit 503; a sliding pair is formed between the impact gland 505 and the impact support 502. Specifically, a second guiding boss 508 is provided on the side wall of the impact gland 505, and a second guiding groove 509 is provided on the inner wall of the impact support 502. The second guiding boss 508 and the second guiding groove 509 cooperate to provide guidance for the impact gland 505 in the vertical direction, which can avoid the problem of the drill bit 503 slipping by itself during use; a third elastic member 506 is also provided between the impact gland 505 and the impact support 502. The third elastic member 506 is used to provide the elastic force for the reset of the drill bit 503 of the impactor 5. Specifically, the third elastic member 506 is a spring, and the upper and lower ends of the spring are respectively connected with the impact gland 505 and the impact support 502.

[0042] Further, in order to limit the swing of the percussion rotary drill tool, a primary positioner 9 is provided between the coiled tubing 1 and the primary housing 2. The primary positioner 9 includes a fixed support 901 which is sleeved on the primary upper connector 7. Specifically, the fixed support 901 is threadedly connected to the primary upper connector 7. A plurality of positioning rods 902 are circumferentially distributed on the side wall of the fixed support 901. One end of the positioning rod 902 is connected to the fixed support 901. Preferably, the positioning rod 902 is threadedly connected to the fixed support 901, which facilitates disassembly and replacement. The other end of the positioning rod 902 is fixedly connected with a positioning plate 904 through a connecting block 903. The positioning plate 904 is an annular steel plate, and its outer diameter is determined according to the drilling diameter.

[0043] Further, a secondary positioner 10 is provided between the primary housing 2 and the sealed bearing 3. The secondary positioner 10 has the same structure as the primary positioner 9, so as to improve the limiting effect. More specifically, the number of the positioning rods 902 on both the primary positioner 9 and the secondary positioner 10 is four, and the included angle between the midlines of two adjacent positioning rods 902 on the primary positioner 9 and the secondary positioner 10 is 45°. Thus, the positioning effects of the primary positioner 9 and the secondary positioner 10 can be ensured.

[0044] Further, the positioning rod 902 is threadedly connected to the fixed support 901. Specifically, the positioning rod 902 is perpendicular to the fixed support 901. By adjusting the length of the positioning rod 902 extending out, the device can be adapted to different drilling diameters.

[0045] The above-mentioned sealing ring is a rubber ring, and the number of each group of sealing rings is at least two to ensure the sealing effect.

[0046] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or replacements can still be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. An impact rotary drill, comprising a coiled tubing (1), characterized in that: A first-stage housing (2) is provided at the lower end of the coiled tubing (1). A sealing bearing (3) is connected to the lower end of the first-stage housing (2). A second-stage drive assembly (4) is connected to the lower end of the sealing bearing (3). An impactor (5) is connected to the lower end of the second-stage drive assembly (4). A rotary assembly (6) for driving the impactor (5) to rotate reciprocally is provided in the first-stage housing (2), and the rotary assembly (6) is driven by high-pressure fluid. The upper end of the first-stage housing (2) is connected to the coiled tubing (1) through a first-stage upper connector (7), and the lower end of the first-stage housing (2) is connected to the sealing bearing (3) through a first-stage lower connector (8). The rotary assembly (6) includes a first-stage drive shaft (601). A fluid passage (602) is provided axially in the first-stage drive shaft (601). The upper part of the first-stage drive shaft (601) passes through the first-stage upper connector (7) and is in contact therewith. A sliding pair is formed between the first-stage drive shaft (601) and the first-stage upper connector (7). The lower part of the first-stage drive shaft (601) passes through the first-stage lower connector (8). A first elastic member (603) is provided between the lower end face of the middle part of the first-stage drive shaft (601) and the first-stage lower connector (8). The side wall of the middle part of the first-stage drive shaft (601) is in contact with the inner wall of the first-stage housing (2). A flow distribution hole (604) is provided below the side wall of the upper part of the first-stage drive shaft (601). A pressure relief hole (605) is provided in the side wall of the first-stage housing (2). An overflow hole (606) is formed in the side wall of the first-stage housing (2) below the pressure relief hole (605). A spiral drive groove (607) is provided in the side wall of the lower end of the first-stage drive shaft (601). A drive column (608) is connected to the inside of the sealing bearing (3), and one end of the drive column (608) is located in the spiral drive groove (607).

2. The percussion-rotary drill tool according to claim 1, characterized in that: The second-stage drive assembly (4) includes a second-stage housing (401). The upper end of the second-stage housing (401) is connected to the lower end of the sealing bearing (3) through a second-stage upper connector (402). The lower end of the second-stage housing (401) is connected to the impactor (5) through a second-stage lower connector (403). A plurality of fluid flow channels (404) are axially provided in the second-stage upper connector (402). A second-stage drive shaft (405) is provided in the second-stage housing (401). A fluid discharge channel (406) is provided at the lower end of the second-stage drive shaft (405). The upper part of the second-stage drive shaft (405) passes through the second-stage upper connector (402) and is in contact therewith. The lower part of the second-stage drive shaft (405) passes through the second-stage lower connector (403). The side wall of the middle part of the second-stage drive shaft (405) is in contact with the second-stage housing (401). A second elastic member (407) is provided between the lower end of the middle part of the second-stage drive shaft (405) and the second-stage lower connector (403).

3. The percussion-rotary drill tool according to claim 2, characterized in that: The impactor (5) includes an impact housing (501). The upper end of the impact housing (501) is connected to the secondary lower connector (403). The lower end of the impact housing (501) is connected to an impact support (502). A drill bit (503) is inserted into the lower end of the impact support (502). A fluid flow channel (504) is axially provided in the drill bit (503). An impact gland (505) is provided at the upper end of the drill bit (503). A sliding pair is formed between the impact gland (505) and the impact support (502). A third elastic member (506) is provided between the impact gland (505) and the impact support (502).

4. The percussion-rotary drill tool according to claim 1, characterized in that: The sealed bearing (3) includes an upper support (301) and a lower support (302). The upper support (301) is connected to the primary lower connector (8). An inner boss (303) is provided at the lower end inside the upper support (301). The upper part of the lower support (302) is located inside the upper support (301). An upper gland (304) is sleeved on the upper part of the lower support (302). A number of upper balls (305) are provided between the lower end of the upper gland (304) and the inner boss (303). A number of lower balls (306) are provided between the lower end of the upper support (301) and the lower support (302). An installation hole for installing a drive post (608) is provided in the side wall of the lower support (302). The drive post (608) is inserted into the installation hole.

5. The percussion-rotary drill tool according to claim 1, wherein: A primary positioner (9) is provided between the coiled tubing (1) and the primary housing (2). The primary positioner (9) includes a fixed support (901). The fixed support (901) is sleeved on the primary upper connector (7). A number of positioning rods (902) are circumferentially distributed on the side wall of the fixed support (901). One end of the positioning rod (902) is connected to the fixed support (901). The other end of the positioning rod (902) is connected to a positioning plate (904) through a connecting block (903).

6. The percussion-rotary drill tool according to claim 5, wherein: A secondary positioner (10) is provided between the primary housing (2) and the sealed bearing (3). The secondary positioner (10) has the same structure as the primary positioner (9).

7. The percussion-rotary drill tool according to claim 6, characterized in that: The number of the positioning rods (902) is four, and the included angle between the midlines of two adjacent positioning rods (902) of the primary positioner (9) and the secondary positioner (10) is 45°.

8. A percussion-rotary drill tool according to claim 5 or 6, characterized in that: The positioning rod (902) is threadedly connected to the fixed support (901).

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