While-drilling monitored hole-making drilling tool

Abstract

The application discloses a hole-forming drilling tool capable of monitoring while drilling, a swivel is connected with a casing assembly through a joint assembly, a monitoring device and a drill bit assembly are inserted into an inner passage of the casing assembly, the monitoring device is connected with the drill bit assembly, the monitoring device is connected with a background processing system through wired or wireless communication, and the drill bit assembly is connected with the casing assembly through a clamping structure. The application can monitor the hole inclination of a drilling hole in real time during drilling, real-time monitoring data can be fed back to the background processing system through a line assembly, construction personnel can adjust construction parameters in time according to the real-time monitoring data, the hole verticality can be accurately controlled, deviation correction can be carried out in time, the difficulty of deviation correction is greatly reduced, the deviation correction process is simple, the time cost is short, and the drilling hole that exceeds the standard can be timely corrected and remedied, the drilling hole can be avoided from being abandoned due to serious hole inclination exceeding the standard, waste is reduced, and the construction period can be shortened.

Description

Technical Field

[0001] This invention relates to the field of rock and soil drilling and excavation technology, and in particular to a drilling tool that can monitor drilling progress. Background Technology

[0002] During drilling operations, borehole verticality is one of the key factors in controlling borehole quality. High borehole verticality can reduce the difficulty of subsequent jet grouting or other construction processes. Moreover, high borehole verticality can save cement and other building materials, reduce project costs, and better meet the requirements of energy conservation, environmental protection, and low carbon emissions.

[0003] Typically, borehole depths range from tens to hundreds of meters, with some reaching depths of over a hundred meters. However, the structure of strata is not uniform from top to bottom. During drilling, when encountering sloping, hard surfaces or unevenly hard strata, the drill bit may deviate due to uneven stress, resulting in excessive borehole inclination. Therefore, it is necessary to check the verticality of the borehole to correct deviations. In existing technology, after drilling is completed, the drill string is removed, and a probe is extended into the borehole to measure the inclination. If the borehole inclination does not meet requirements, correction measures are taken. If the inclination is severely excessive, correction is difficult, and boreholes that cannot be corrected through correction are simply abandoned. Existing drilling tools cannot monitor hole inclination in real time during drilling, and can only conduct post-drilling inspections. They cannot correct the hole deviation in a timely manner during drilling, which is difficult, complex, and time-consuming. If the hole deviation exceeds the standard, it will be abandoned, resulting in great waste and delays in the construction period. Moreover, filling the offset space also increases the amount of cement or other building materials used, increasing project costs. Summary of the Invention

[0004] In response to the shortcomings of existing drilling tools, the applicant provides a well-structured drilling tool with real-time monitoring capabilities. During drilling, the tool can monitor borehole inclination in real time, correct deviations promptly, reduce waste, shorten construction time, and lower project costs.

[0005] The technical solution adopted in this invention is as follows:

[0006] A drilling tool with monitoring capabilities during drilling includes a rotary head connected to a casing assembly via a connector assembly. A monitoring device and a drill bit assembly are inserted into the inner channel of the casing assembly, and the monitoring device is connected to the drill bit assembly. The monitoring device is connected to a back-end processing system via wired or wireless communication, and the drill bit assembly is connected to the casing assembly via a snap-fit ​​structure.

[0007] As a further improvement to the above technical solution:

[0008] The drill bit assembly is engaged with the casing assembly via several positioning devices. The pressure block of the positioning device is fixed on the mandrel in the center of the drill bit assembly. The locking block is located on the outside of the pressure block, with one end of the locking block hinged to the drill bit assembly and the other end having a buckle. An L-shaped notch is opened on the side of the lower part of the locking block facing the pressure block, and the notch cooperates with the pressure block. Corresponding slots are opened on the wall surface of the casing assembly, and the buckle cooperates with the slots to achieve engagement.

[0009] A spring is located inside the drill bit assembly, above the pressure block, and the spring presses against the pressure block.

[0010] The monitoring device is connected to the back-end processing system through the wiring assembly. The cable of the wiring assembly passes through the lead channel of the rotary unit and the connector assembly and connects to the rotating part of the brush. The rotating part of the brush is connected to the rotary assembly of the rotary unit, and the stationary part is connected to the housing of the rotary unit.

[0011] The cable sheath of the line assembly is covered with a rubber tube. The lower end of the rubber tube is connected to the monitoring device, and the upper end of the rubber tube is connected to the connector assembly via a telescopic device. A sliding rod is inserted into the sleeve of the telescopic device. The sleeve is fixedly connected to the connector assembly, and the rubber tube is fixedly connected to the sliding rod.

[0012] The monitoring device and the drill bit assembly are connected by an anti-winding device; the anti-winding device has a rotating sleeve on its rotating shaft, and a bearing assembly is provided between the rotating shaft and the rotating sleeve; the rotating shaft is fixedly connected to the protective cover of the monitoring device, and the rotating sleeve is fixedly connected to the drill bit assembly.

[0013] The monitoring device is equipped with a tilt sensor on its monitoring base.

[0014] The monitoring device is equipped with an azimuth sensor and a pressure sensor on its monitoring base.

[0015] The sensor housing of the monitoring device is equipped with a protective cover, which is fixedly connected to the monitoring base.

[0016] The bottom of the casing assembly is provided with several drill bits.

[0017] The beneficial effects of this invention are as follows:

[0018] This invention monitors borehole inclination in real time during the drilling process. The real-time monitoring data is fed back to the back-end processing system via a circuit assembly. Construction personnel can adjust construction parameters promptly based on the real-time monitoring data, precisely control the verticality of the borehole, and correct deviations immediately if the borehole inclination exceeds the specified requirements, preventing the deviation from worsening. Correction is performed even when the deviation is slightly excessive, greatly reducing the difficulty of correction. The correction process is simple and quick, and timely correction of boreholes exceeding the standard can prevent boreholes from being abandoned due to severe deviations, reducing waste and shortening the construction period. In addition, because the borehole is corrected promptly when the deviation is slightly excessive, it can avoid the situation where the offset space and borehole diameter become too large due to multiple corrections, thereby reducing the amount of cement or other building materials used to fill the offset space and lowering project costs. The monitoring device and drill bit assembly are concealed within the casing assembly's internal channel. The drill bit assembly and casing assembly are connected by a snap-fit ​​structure. After drilling is completed, the snap-fit ​​structure is released, allowing the drill bit assembly and other internal devices to be completely removed from the casing assembly's internal channel. The casing assembly remains inside the hole. Then, a PVC (polyvinyl chloride) pipe for wall protection is lowered into the hole before the casing assembly is removed. This design better ensures the verticality of the hole, improves the hole quality, and also prevents hole collapse, maintaining the integrity of the hole and avoiding waste caused by hole collapse. This design is more economical.

[0019] In this invention, the cable is connected to the rotating part of the brush. When the rotator drives the monitoring device to rotate, the cable rotates with the rotator through the rotating part, avoiding cable entanglement and damage, and ensuring the effectiveness of data transmission.

[0020] The telescopic device of the present invention can provide a certain axial displacement margin for the circuit assembly, preventing the circuit assembly from being pulled off the monitoring device and ensuring the effectiveness of the data transmission monitored in real time by the monitoring device.

[0021] The monitoring device and drill bit assembly of the present invention can rotate relative to each other through an anti-entanglement device to avoid damage to the wiring components due to entanglement and to ensure the effectiveness of data transmission.

[0022] The protective cover of this invention provides protection for the sensor, preventing damage from mud at the bottom of the hole or from excessive pressure inside the hole.

[0023] The casing assembly of the present invention has several drill bits at the bottom that facilitate drilling. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention.

[0025] Figure 2 for Figure 1 Enlarged view of part A in the middle.

[0026] Figure 3 for Figure 1 Enlarged view of section B in the middle.

[0027] In the diagram: 1. Rotary head; 11. Rotary assembly; 12. Housing; 2. Connector assembly; 3. Casing assembly; 31. Slot; 32. Drill bit; 4. Monitoring device; 41. Monitoring seat; 42. Tilt sensor; 43. Protective cover; 5. Anti-winding device; 51. Shaft; 52. Rotating sleeve; 53. Bearing assembly; 54. End cap; 6. Drill bit assembly; 61. Spring; 7. Circuit assembly; 71. Cable; 72. Hose; 8. Telescopic device; 81. Sleeve; 82. Slide rod; 9. Brush; 91. Rotating component; 92. Stationary component; 10. Positioning device; 101. Pressure block; 102. Locking block; 1021. Snap-fit; 1022. Notch; 20. Lead wire channel; 30. Inner channel. Detailed Implementation

[0028] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0029] like Figure 1 As shown, the rotary head 1 of this invention is connected to the casing assembly 3 via a connector assembly 2. A monitoring device 4, an anti-winding device 5, and a drill bit assembly 6 are sequentially connected from top to bottom in the lower part of the inner channel 30 of the casing assembly 3. The monitoring device 4 is connected to the back-end processing system (not shown) via a wiring assembly 7. The drill bit assembly 6 is connected to the casing assembly 3 via a positioning device 10. The rotary head 1 drives the casing assembly 3, and subsequently the drill bit assembly 6, the anti-winding device 5, and the monitoring device 4 to rotate and drill together via the connector assembly 2. The monitoring device 4 monitors the borehole inclination in real time during the drilling process. The real-time monitoring data is fed back to the back-end processing system via the wiring assembly 7. Construction personnel can then use the real-time monitoring data to... Timely adjustment of construction parameters and precise control of borehole verticality are crucial. If borehole inclination exceeds the specified requirements, timely correction can be implemented to prevent the inclination from worsening. Correction is initiated even when inclination is only slightly excessive, significantly reducing the difficulty and time required for correction. Timely correction of boreholes exceeding the inclination limit prevents abandonment due to severe inclination, reducing waste and shortening the construction period. Furthermore, timely correction of slight inclination prevents excessive offset space and borehole diameter caused by multiple corrections, thus reducing the amount of cement or other building materials used to fill the offset space and lowering project costs.

[0030] like Figure 1As shown, a lead wire channel 20 is provided in the center of the rotary device 1 and the connector assembly 2, passing through the inner channel 30 of the sleeve assembly 3. The circuit assembly 7 includes a cable 71 and a hose 72. The hose 72 is sleeved on the cable 71 to protect it. The lower ends of the cable 71 and the hose 72 are connected to the monitoring device 4. The cable 71 passes through the lead wire channel 20, and the upper end of the hose 72 is connected to the connector assembly 2 via a telescopic device 8. A sliding rod 82 that can slide up and down axially is inserted into the sleeve 81 of the telescopic device 8. The sleeve 81 is fixedly connected to the connector assembly 2, and the hose 72 is fixedly connected to the sliding rod 82. When the sleeve assembly 3 is disassembled or a sleeve is added, the telescopic device 8 can provide a certain axial displacement margin for the circuit assembly 7, preventing the circuit assembly 7 from being pulled off the monitoring device 4 and ensuring the effectiveness of the data transmission monitored in real time by the monitoring device 4.

[0031] like Figure 1 , Figure 3 As shown, the rotary assembly 11 of the rotary unit 1 is protected by a housing 12, and a brush 9 is provided at the upper end of the rotary assembly 11. Figure 3 As shown, the brush 9 includes a rotating part 91 and a stationary part 92 disposed inside and outside the brush 9. The rotating part 91 is fixedly connected to the rotary assembly 11, and the stationary part 92 is fixedly connected to the housing 12. The cable 71 of the circuit assembly 7 is led out from the top of the rotary assembly 11 and connected to the rotating part 91 of the brush 9. When the rotary unit 1 drives the monitoring device 4 to rotate, the cable 71 rotates with the rotary unit 1 (i.e., with the monitoring device 4) through the rotating part 91, avoiding the cable 71 from getting tangled and damaged, and ensuring the effectiveness of data transmission.

[0032] like Figure 1 As shown, the monitoring device 4 has an inclination sensor 42 installed on its monitoring base 41 to monitor the borehole diameter in real time. In other embodiments, an azimuth sensor and a pressure sensor can also be installed on the monitoring base 41 to monitor the borehole azimuth and borehole pressure in real time, allowing for more precise control of the borehole quality. The inclination sensor 42 is covered by a protective cover 43, which is fixedly connected to the monitoring base 41. The protective cover 43 provides protection for the sensor, preventing damage from bottom hole mud or excessive borehole pressure.

[0033] like Figure 2As shown, the central rotating shaft 51 of the anti-winding device 5 is fitted with a rotating sleeve 52. Bearing assemblies 53 are respectively provided at both ends of the rotating shaft 51 and the rotating sleeve 52, allowing the rotating shaft 51 to rotate relative to the rotating sleeve 52 via the bearing assemblies 53. The rotating sleeve 52 has a closed bottom and an open top, with an end cap 54 on the top surface. The rotating shaft 51 passes through the center of the end cap 54. The rotating shaft 51 is fixedly connected to the protective cover 43 of the monitoring device 4, and the rotating sleeve 52 is fixedly connected to the drill bit assembly 6. When the casing assembly 3 is disassembled or a casing is added, the monitoring device 4 and the drill bit assembly 6 (i.e., the casing assembly 3) will rotate differently. The monitoring device 4 and the drill bit assembly 6 can rotate relative to each other via the anti-winding device 5, preventing the wiring assembly 7 from becoming entangled and damaged, and ensuring the effectiveness of data transmission.

[0034] like Figure 2 As shown, the drill bit assembly 6 is provided with several sets of positioning devices 10 along its circumference. Each positioning device 10 includes a pressure block 101 and a locking block 102. The pressure block 101 is fixed to the mandrel in the center of the drill bit assembly 6. The locking block 102 is located outside the pressure block 101, with one end hinged to the drill bit assembly 6 and the other end having a latch 1021. An L-shaped notch 1022 is provided on the lower part of the locking block 102 facing the pressure block 101. The notch 1022 cooperates with the pressure block 101 to lock or release the locking block 102. A slot 31 is provided on the circumferential wall of the casing assembly 3, corresponding to the latch 1021. A spring 61 is provided inside the drill bit assembly 6, above the pressure block 101. The spring 61 is pressed against the pressure block 101. Under normal conditions, the spring 61 is in a compressed state, and the elastic force generated by it pushes the pressure block 101 downward, thereby locking the buckle 1021 of the locking block 102 into the slot 31 to achieve a locking engagement. When the drill is lifted after drilling is completed, the drill bit assembly 6 drives the pressure block 101 to move axially upward, while compressing the spring 61. The locking block 102 engages with the pressure block 101 through the notch 1022 and rotates inward around the hinge point. The buckle 1021 disengages from the slot 31 and is released from the casing assembly 3.

[0035] like Figure 1 As shown, the bottom of the casing assembly 3 extends downward and is provided with several drill bits 32, which facilitates drilling.

[0036] The monitoring device 4, anti-winding device 5, and drill bit assembly 6 of this invention are concealed within the inner channel 30 of the casing assembly 3. The drill bit assembly 6 is connected to the casing assembly 3 via a snap-fit ​​structure. During drilling, the rotary head 1 drives the casing assembly 3 and its internal devices to rotate together for drilling. After drilling is completed, the locking block 102 of the positioning device 10 is released, allowing the drill bit assembly 6, along with the monitoring device 4, anti-winding device 5, and wiring assembly 7—the entire internal device set—to be removed from the inner channel 30 of the casing assembly 3. The casing assembly 3 remains inside the hole. Then, a PVC (polyvinyl chloride) pipe for wall protection is lowered into the hole before the casing assembly 3 is removed. This method is more conducive to ensuring the verticality of the hole, improving the quality of the hole, and also avoiding hole collapse, maintaining the integrity of the hole, and preventing the drilled hole from being scrapped due to collapse, thus avoiding waste and improving economic efficiency.

[0037] The above description is an explanation of the present invention and not a limitation thereof. The present invention can be modified in any way without departing from its spirit. For example, in other embodiments, under the condition that communication conditions are met, the monitoring device 4 can also connect to the background processing system wirelessly for data transmission.

Claims

1. A drilling tool with monitoring capabilities during drilling, characterized in that: The rotary head (1) is connected to the casing assembly (3) via the connector assembly (2). The inner channel (30) of the casing assembly (3) is fitted with a monitoring device (4) and a drill bit assembly (6). The monitoring device (4) is connected to the drill bit assembly (6). The monitoring device (4) is connected to the background processing system via wired or wireless communication. The drill bit assembly (6) is connected to the casing assembly (3) via a snap-fit ​​structure. The drill bit assembly (6) is snap-fitted to the casing assembly (3) via several sets of positioning devices (10). The pressure block (101) of the positioning device (10) is fixed on the mandrel in the center of the drill bit assembly (6). 2) The locking block (102) is set on the outside of the pressure block (101), with one end hinged to the drill bit assembly (6) and the other end provided with a buckle (1021); the lower part of the locking block (102) facing the pressure block (101) has an L-shaped notch (1022) which cooperates with the pressure block (101); the casing assembly (3) has a corresponding slot (31) on its wall surface, and the buckle (1021) cooperates with the slot (31) to achieve a locking; a spring (61) is provided inside the drill bit assembly (6) above the pressure block (101), and the spring (61) is pressed against the pressure block (101); The monitoring device (4) is connected to the background processing system through the line assembly (7). The cable (71) of the line assembly (7) is covered with a rubber tube (72). The lower end of the rubber tube (72) is connected to the monitoring device (4), and the upper end of the rubber tube (72) is connected to the connector assembly (2) through the telescopic device (8). The sleeve (81) of the telescopic device (8) is fitted with a slide rod (82). The sleeve (81) is fixedly connected to the connector assembly (2), and the rubber tube (72) is fixedly connected to the slide rod (82). The monitoring device (4) is connected to the drill bit assembly (6) through an anti-winding device (5); the rotating shaft (51) of the anti-winding device (5) is fitted with a rotating sleeve (52), and a bearing assembly (53) is provided between the rotating shaft (51) and the rotating sleeve (52); the rotating shaft (51) is fixedly connected to the protective cover (43) of the monitoring device (4), and the rotating sleeve (52) is fixedly connected to the drill bit assembly (6).

2. The drilling tool with monitoring capability during drilling according to claim 1, characterized in that: The cable (71) of the circuit assembly (7) passes through the lead channel (20) of the rotary (1) and the connector assembly (2) and connects to the rotating part (91) of the brush (9). The rotating part (91) of the brush (9) is connected to the rotary assembly (11) of the rotary (1), and the stationary part (92) is connected to the housing (12) of the rotary (1).

3. The drilling tool with monitoring capability during drilling according to claim 1, characterized in that: An inclination sensor (42) is installed on the monitoring seat (41) of the monitoring device (4).

4. The drilling tool with monitoring capability during drilling according to claim 1, characterized in that: An azimuth sensor and a pressure sensor are installed on the monitoring base (41) of the monitoring device (4).

5. The drilling tool with monitoring capability during drilling according to claim 1, characterized in that: The sensor cover of the monitoring device (4) is equipped with a protective cover (43), which is fixedly connected to the monitoring base (41).

6. The drilling tool with monitoring capability during drilling according to claim 1, characterized in that: The bottom of the casing assembly (3) is provided with several drill bits (32).

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