Coal mine downhole large angle continuous coring drill tool combination with trajectory measurement function
By designing a continuous coring drill bit assembly for high-angle drilling in coal mines with trajectory measurement function, integrating a 3-axis accelerometer and Bluetooth circuit board, and combining water jet and elastic buffer pad, the problem of continuous coring and trajectory measurement in high-angle drilling was solved, realizing safe and efficient core acquisition and data transmission.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- XIAN RES INST OF CHINA COAL TECH & ENG GRP CORP
- Filing Date
- 2023-11-28
- Publication Date
- 2026-07-03
Smart Images
Figure CN117684900B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of coal mine drilling and coring technology, and relates to a coal mine underground high-angle continuous coring drill bit assembly and method with trajectory measurement function. Background Technology
[0002] The geological conditions in my country's coal mines are complex, with most mines being coal and gas outburst mines. These mines have complex hydrogeological conditions, with uneven distribution and distribution of hidden geological anomalies such as faults, folds, and fracture zones within the coal seams and roof and floor strata. The nearby coal and rock masses are often fractured, displaced, undulating, and lack integrity, easily forming gas anomaly zones, stress concentration zones, and tectonic coal development zones. As mining activities continue, gas accidents are prone to occur. With the continuous increase in the depth of mining in my country, geological conditions are becoming increasingly complex. Coal seam mining faces problems such as high ground stress, high gas pressure, and high gas content, which severely restrict the development of deeper mines in my country.
[0003] Core drilling is the only way to obtain complete data and provide original stratigraphic specimens during geological exploration and mineral resource development. It is also a reliable source of data for observing stratigraphic lithology, physical properties, and evaluating mineral resources. Currently, core drilling is required for the exploration of geological anomalies in coal mines, the analysis of water-bearing strata, and the study of the physical and mechanical properties and impact tendency of rockburst strata. Existing coring drilling technology and equipment mainly include three types: single-tube (or double-tube) jacking coring tools, wireline coring tools, and hydraulic reverse circulation coring tools. In most cases, these are used for near-horizontal and vertically downward coring boreholes. However, when there are unidentified geological anomalies in the coal seam roof or when high ground stress necessitates analysis of the formation's physical and mechanical properties, it is necessary to construct coring boreholes at large angles or even vertically upwards. When constructing such coring boreholes, wireline coring tools are difficult to lower and retrieve due to the weight of the inner tube assembly; single-tube (or double-tube) jacking coring tools are limited by the length of the core tube, requiring repeated raising and lowering of the drill string, resulting in a large amount of auxiliary work and long operation time; although reverse circulation coring tools can achieve continuous core collection without lifting the drill string and have a simple structure, the core is subjected to the combined effects of its own weight and the propulsive force of the backflow in the central channel, causing the core to achieve a high migration speed. The physical and mechanical properties of the test specimens are tested according to national standards. Taking columnar rock cores as an example, in boreholes with an elevation angle of 60° and a vertical height of approximately 100m, the velocity of the rock core moving from the fracture to the borehole opening can reach over 20m / s. This not only seriously threatens the lives of workers but also causes damage to the return pipeline connected to the borehole opening. Furthermore, the coring drill bit lacks trajectory measurement capabilities during coring operations. Typically, after drilling is completed, the coring drill bit is retrieved from the borehole, and then a measurement-while-drilling (MWD) system is lowered back in to re-measure the trajectory of the core sample to determine the core strata for later analysis and verification by technical personnel. This trajectory measurement auxiliary work is time-consuming and detrimental to progress control. Therefore, given the current high demand for this type of borehole in many coal mines and the inability of existing technology and equipment to meet the construction requirements, there is an urgent need to develop a continuous coring drill bit with trajectory measurement capabilities suitable for coring operations in boreholes with high elevation angles. Summary of the Invention
[0004] To address the shortcomings of existing technologies, the present invention aims to provide a coal mine underground high-angle continuous coring drill assembly with trajectory measurement function, thereby solving the problems that existing coring drilling technology and equipment cannot meet the requirements for continuous coring and trajectory measurement in coal mine underground high-angle drilling.
[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:
[0006] A coal mine underground high-angle continuous coring drill assembly with trajectory measurement function includes a coring drill bit, a trajectory measurement double-wall drill rod, multiple conventional double-wall drill rods, multiple jet double-wall drill rods, a buffer double-wall drill rod, and a double-wall water feeder connected in sequence.
[0007] The core drill bit has a double-wall structure. The outer wall of the core drill bit has multiple jet holes with the axis of the jet holes forming a 30° angle with the central axis of the drill bit. The jet holes connect the inner annulus of the core drill bit and the borehole annulus. The outer diameter of the core drill bit is larger than that of a conventional double-wall drill rod.
[0008] The trajectory measurement double-wall drill rod includes a rod body I and an inner tube I inside, with an annular space I between the rod body I and the inner tube I. The inner wall of the rod body I has a fan-shaped boss with a fan-shaped cross-section. The outer wall of the rod body I at the fan-shaped boss has a first mounting groove, a second mounting groove, a third mounting groove, and a cylindrical groove arranged sequentially along the axial direction. The side wall of the first mounting groove has a mounting through hole, which connects the first mounting groove and the annular space I, and a pressure switch is installed at the mounting through hole. The first mounting groove is sealed with a circuit board cover after the acquisition board and the main control board are installed in the first mounting groove. The second mounting groove is sealed with a battery cover after the battery pack is installed in the second mounting groove. The third mounting groove is sealed with a Bluetooth circuit board cover after the Bluetooth circuit board is installed in the third mounting groove. The cylindrical groove is sealed with a Reynolds connector after being arranged in the cylindrical groove. The acquisition board has a tilting module, and the acquisition board, the main control board, the battery pack, the Bluetooth circuit board, and the Reynolds connector communicate with each other through a cable.
[0009] The conventional double-walled drill pipe includes an outer tube II and an inner tube II inside it; the outer tube II is threadedly connected to the rod body I and other outer tubes II, and the inner tube II is inserted into the inner tube I and other inner tubes II.
[0010] The jet double-wall drill pipe includes an outer tube III and an inner tube III inside it; multiple internal spray holes are evenly distributed around the side wall of the inner tube III near the core drill bit, and the internal spray holes form a 45° angle with the central axis of the drill bit; the outer tube III is threaded to the outer tube II and other outer tubes III, and the inner tube III is inserted to the inner tube II and other inner tubes III.
[0011] The buffered double-walled drill pipe includes an outer tube IV and an inner tube IV inside it; an elastic buffer pad, a spring, and a spring fixing seat are arranged sequentially along the axial direction inside the rear end of the inner tube IV; the elastic buffer pad is interference-fitted into the front end of the spring, the elastic buffer pad has a circular through hole in the center and a slag guide groove on the edge, the rear end of the spring is fixedly connected to the spring fixing seat, the spring fixing seat has a central through hole, the spring fixing seat is connected to the female head of the inner tube IV and the female connector of the inner tube; the outer tube IV is threadedly connected to the outer tube II or the outer tube III, and the inner tube IV is inserted into the inner tube II or the inner tube III;
[0012] The inner and outer pipes of the double-walled water supply device are connected to the inner pipe IV and the outer pipe IV, respectively.
[0013] The present invention also includes the following technical features:
[0014] Specifically, the inclination measurement module in the acquisition board integrates a 3-axis accelerometer and a 3-axis magnetometer to measure the static attitude data of the drill string after the construction of a single drill rod in the hole during the drilling process;
[0015] The main control board integrates the pressure switch, and the main control board controls whether the acquisition board acquires data and encodes and stores the acquired data through the pressure switch;
[0016] The battery pack can power the main control board, the acquisition board, and the Bluetooth circuit board.
[0017] The Bluetooth circuit board can upload the data stored in the main control board to a ground computer for demodulation via Bluetooth.
[0018] The Reynolds connector can charge the battery pack;
[0019] Specifically, the Bluetooth circuit board cover has a through hole in the middle, and a frustum-shaped spring seat is provided on the lower part of the inner wall of the through hole. A touch rod with a T-shaped cross section is provided inside the through hole. A limit spring is fitted on the touch rod, and the upper and lower ends of the limit spring abut against the frustum of the touch rod and the frustum-shaped spring seat, respectively. A limit ring is installed at the upper end of the through hole, and the limit ring presses against the top of the touch rod. When the touch rod is pressed to compress the limit spring and move downward, it can touch the Bluetooth switch on the Bluetooth circuit board. When the touch rod is stopped, it can move upward under the action of the limit spring. Two O-rings are provided on the upper part of the touch rod for sealing. The limit ring is threaded to the Bluetooth circuit board cover. A cross groove tool is provided on the top of the limit ring for installation and removal.
[0020] Specifically, the acquisition board and main control board are fixed to the bottom of the first mounting slot with bolts; the battery pack is fixed to the bottom of the second mounting slot by injection, and the battery cover plate radially presses the battery pack to make it stable; the Bluetooth circuit board is fixed to the bottom of the third mounting slot with bolts; the Reynolds connector is fixed in the cylindrical groove by injection; the circuit board cover plate, battery cover plate, Bluetooth circuit board cover plate and the corresponding mounting slot are provided with U-shaped sealing gaskets and are all fixed with bolts to ensure that liquid flow will not enter the mounting slot and corrode the circuit board and cables during operation.
[0021] Specifically, the first mounting slot and the second mounting slot are connected through the first wire hole, the second mounting slot and the third mounting slot are connected through the second wire hole, and the third mounting slot and the cylindrical slot are connected through the third wire hole; the acquisition board, the main control board, the battery pack, the Bluetooth circuit board, and the Reynolds connector communicate with each other by laying cables through the first wire hole, the second wire hole, and the third wire hole, and the wire holes are sealed with glue after the cables are laid.
[0022] Specifically, in the conventional double-walled drill pipe, the outer wall of the outer tube II is provided with a positive spiral groove; both ends of the inner wall of the outer tube II are respectively provided with a first shoulder and a second shoulder; the outer tube II and the inner tube II are arranged coaxially.
[0023] The inner tube II is connected to an inner tube male connector and an inner tube female connector at both ends respectively; the inner tube male connector has a first threaded section on its inner wall and a first support block on its outer wall, and the inner tube female connector has a second threaded section on its inner wall and a second support block on its outer wall; after the inner tube II is threadedly connected to the inner tube male connector and the inner tube female connector at both ends respectively, the first support block is supported on the first shoulder, and the second support block is supported on the second shoulder; the outline dimensions of the first support block are consistent with the outline dimensions of the first shoulder, and the outline dimensions of the second support block are consistent with the outline dimensions of the second shoulder, to ensure the coaxiality of the inner tube II and the outer tube II.
[0024] The structural dimensions of the jet double-wall drill pipe are the same as those of the conventional double-wall drill pipe. The outer tube III and the outer tube II have the same structure. The inner tube III and the inner tube male and female connectors at both ends have the same structure as the inner tube II and the inner tube male and female connectors at both ends.
[0025] Specifically, the outer tube IV of the buffer double-wall drill pipe has the same structure as the outer tube II, and the inner tube male connector of the inner tube IV has the same structure as the inner tube male connector of the inner tube II; one end of the inner tube IV is a male connector and the other end is a female connector; the lower end of the spring is welded and fixed to the spring fixing seat, the spring fixing seat is threadedly connected to the female connector of the inner tube IV, and the inner tube female connector of the inner tube IV is threadedly connected to the spring fixing seat.
[0026] Specifically, the elastic buffer pad is made of soft rubber material, and four fan-shaped bodies are evenly spaced around the circumference of the elastic buffer pad, with a cuttings guide groove between every two fan-shaped bodies; when the rock core blocks the circular through hole of the elastic buffer pad, the flushing fluid and rock cuttings in the drill bit's inner tube enter the central through hole along the cuttings guide groove; the rear end of the elastic buffer pad is provided with a first ring platform, and the upper end of the spring is inserted into and pressed against the first ring platform.
[0027] Specifically, the outer walls at both ends of the spring fixing seat are provided with a first male thread and a second male thread, the inside of the spring fixing seat is provided with a second annular platform, the rear end of the spring is welded and fixed to the second annular platform, and the central through hole of the spring fixing seat is an annular slag guide port.
[0028] A method for continuous coring and trajectory measurement at high elevation angles in coal mines, which is implemented using a coal mine continuous coring drill assembly with trajectory measurement function, includes the following steps:
[0029] Step 1: The drill string assembly is lowered into the high-angle coring borehole to be drilled. The flushing fluid enters sequentially through the water inlet on the side of the double-wall water feeder, the inner annulus of the buffer double-wall drill rod, the inner annulus of the jet double-wall drill rod, the inner annulus of the conventional double-wall drill rod, the inner annulus of the trajectory measurement double-wall drill rod, and the inner annulus of the coring drill bit. The flushing fluid is sprayed out from the jet hole and the outlet at the bottom of the coring drill bit. At the same time, when the flushing fluid flows to the inner annulus of the trajectory measurement double-wall drill rod, the pressure switch is activated, and the main control board controls the acquisition board to collect tilt and azimuth data. Three sets of data are collected at 1-second intervals. After the data collection is completed, the acquisition board goes into sleep mode, and the main control board encodes and stores the collected data.
[0030] Step 2: The core drill bit grinds and breaks off the bottom rock layer. Under its own gravity, the core slides down into the inner tube IV of the buffer double-wall drill rod. The core impacts the elastic buffer pad and compresses the spring, which buffers, slows down, brakes and collects the descending core. At the same time, the rock cuttings and flushing fluid accompanying the core enter the circular through hole through the slag guide groove on the elastic buffer pad, and enter the inner tube female joint of the inner tube IV through the central through hole of the spring fixing seat. Finally, it returns along the outlet of the tail of the double-wall water feeder.
[0031] Step 3: After completing the core sampling for one drill rod length, stop the pump and drilling, disassemble the buffer double-wall drill rod, and pour out all the rock core collected inside the buffer double-wall drill rod. Add a conventional double-wall drill rod and connect it to the buffer double-wall drill rod. Repeat the above steps until the length of the added conventional double-wall drill rod reaches 10-15m. Then, add a jet double-wall drill rod so that when the flushing fluid flows to the jet double-wall drill rod, it forms a water jet along the inner nozzle. The direction of the water jet is opposite to the direction of rock core movement, which slows down the downward speed of the rock core. At the same time, the pump must be turned on every time a drill rod is added for construction. The pressure switch is activated again to collect and store the current borehole depth, dip angle, and azimuth angle.
[0032] Step 4: After the single core drilling is completed, remove the drill string from the hole and disassemble the trajectory measurement double-wall drill rod. Press the touch lever until it moves down to touch the Bluetooth switch on the Bluetooth circuit board. The instrument's Bluetooth is activated. At this time, it can pair with the explosion-proof computer downhole via Bluetooth, or it can raise the trajectory measurement double-wall drill rod to the surface to pair with the surface computer via Bluetooth. After successful pairing, the stored borehole trajectory data can be retrieved, decoded, and processed.
[0033] Compared with the prior art, the present invention has the following technical effects:
[0034] This invention enables continuous coring at large elevation angles in underground coal mines and also has trajectory measurement capabilities.
[0035] The trajectory measurement module of this invention adopts the principle of double-wall drill pipe sidewall layout, without changing the size and specifications of the central core return channel. It can ensure the measurement of the core drilling trajectory while also ensuring the smooth return of the rock core. The trajectory measurement process is simple and effectively avoids the re-measurement of the downhole core drilling trajectory.
[0036] The entire core drilling tool assembly of this invention has a positive spiral groove structure on its outer wall, which disturbs and assists in the movement of rock cuttings in the borehole annulus. The flushing fluid diverted to the borehole annulus by the core drill bit achieves strong mechanical-hydraulic slag removal, effectively avoiding accidents such as stuck drill and buried drill due to the accumulation of rock cuttings in the borehole annulus.
[0037] The coring drill bit of this invention has a significantly different gradation size from the spiral double-walled drill rod, making the annular area between the borehole and the drill string 20%-40% larger than the central channel area of the drill string. At the same time, the outer wall of the coring drill bit is provided with jet holes, which creates a negative pressure zone in the outer annulus of the coring drill bit, increasing the amount of flushing fluid diverted from the coring drill bit to the borehole annulus, effectively improving the slag removal efficiency of the borehole annulus, and reducing the initial velocity after the rock core fractures.
[0038] The core drilling tool assembly of this invention requires the connection of one internal jet double-wall drill rod after every 10-15m of conventional double-wall drill rod. This allows the flushing fluid to form a water jet in the inner tube of the internal jet double-wall drill rod, which is opposite to the direction of core movement. Through multi-stage deceleration, the downward speed of the core in high-angle boreholes can be effectively reduced.
[0039] The buffer double-walled drill pipe of this invention is placed at the tail of the drill bit. It is equipped with an elastic buffer pad and a spring inside, and the whole is a through structure. This not only ensures that the flushing fluid and rock cuttings in the inner tube can be smoothly discharged out of the hole, but also plays a role in buffering, decelerating, braking and collecting the rock core. Attached Figure Description
[0040] Figure 1 This is a schematic diagram of the overall drill bit assembly of the present invention;
[0041] Figure 2 This is a schematic diagram of the overall trajectory measurement of the double-walled drill pipe of the drill string assembly of the present invention;
[0042] Figure 3 This is a cross-sectional view of the double-walled drill pipe body used for trajectory measurement of the drill string assembly of the present invention;
[0043] Figure 4 This is a cross-sectional view of the double-walled drill pipe AA for trajectory measurement of the drill assembly of the present invention;
[0044] Figure 5 This is a partial view of the trajectory measurement double-wall drill pipe I of the drill string assembly of the present invention;
[0045] Figure 6 This is a cross-sectional view of the double-walled drill pipe BB for trajectory measurement of the drill string assembly of the present invention;
[0046] Figure 7 This is an overall sectional view of the conventional double-walled drill pipe of the drill string assembly of the present invention;
[0047] Figure 8 This is a cross-sectional view of the conventional double-walled drill pipe body of the drill string assembly of the present invention;
[0048] Figure 9 This is a schematic diagram of the conventional double-wall drill pipe inner tube male connector of the drill string assembly of the present invention;
[0049] Figure 10 This is a schematic diagram of the conventional double-wall drill pipe inner tube female connector of the drill string assembly of the present invention;
[0050] Figure 11 This is an overall sectional view of the jet double-wall drill pipe of the drill string assembly of the present invention;
[0051] Figure 12 This is an overall sectional view of the buffered double-walled drill pipe of the drill string assembly of the present invention;
[0052] Figure 13This is a left view of the elastic buffer pad of the double-walled drill pipe in the drill assembly of the present invention;
[0053] Figure 14 This is a cross-sectional view AA of the elastic buffer pad of the double-walled drill pipe in the drill assembly of the present invention;
[0054] Figure 15 This is a cross-sectional view of the buffer double-walled drill pipe spring seat of the drill assembly of the present invention.
[0055] The meanings of the labels in the diagram are as follows:
[0056] 1. Core drilling bit; 2. Trajectory measurement double-wall drill rod; 3. Conventional double-wall drill rod; 4. Jet double-wall drill rod; 5. Buffer double-wall drill rod; 6. Double-wall water supply device.
[0057] 101. Jet orifice; 201. Rod I; 202. Circuit board cover; 203. Battery cover; 204. Bluetooth circuit board cover; 205. Plug; 206. Acquisition board; 207. Main control board; 208. Battery pack; 209. Bluetooth circuit board; 210. Reynolds connector; 211. Inner tube I; 212. Limiting ring; 213. Touch lever; 214. O-ring; 215. Limiting spring; 216. Pressure switch;
[0058] 301. Outer tube II, 302. Male connector for inner tube, 303. Inner tube II, 304. Female connector for inner tube;
[0059] 401. Inner spray hole; 501. Inner tube IV; 502. Elastic buffer pad; 503. Spring; 504. Spring retainer;
[0060] 2011. First mounting slot; 2012. Second mounting slot; 2013. Third mounting slot; 2014. Columnar slot; 2015. First wire through hole; 2016. Second wire through hole; 2017. Third wire through hole; 2018. Fan-shaped boss; 2019. Mounting through hole;
[0061] 3011. First shoulder; 3012. Positive spiral groove; 3013. Second shoulder; 3021. Double sealing ring groove; 3022. First support block; 3023. First threaded section; 3041. Second threaded section; 3042. Second support block;
[0062] 5021. Fan-shaped body; 5022. Circular through hole; 5023. Slag guide groove; 5024. First annular groove; 5041. First male thread; 5042. Second annular groove; 5043. Second male thread; 5044. Annular slag guide port. Detailed Implementation
[0063] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.
[0064] Example 1:
[0065] like Figures 1 to 15 As shown, this embodiment provides a coal mine underground high-angle continuous coring drill assembly with trajectory measurement function, including a coring drill bit 1, a trajectory measurement double-wall drill rod 2, multiple conventional double-wall drill rods 3, multiple jet double-wall drill rods 4, a buffer double-wall drill rod 5, and a double-wall water supply device 6 connected in sequence. In other embodiments, when the total length of the conventional double-wall drill rod 3 reaches about 10-15m, the rear end of the conventional double-wall drill rod 3 is connected to the jet double-wall drill rod 4, and the rear end of the jet double-wall drill rod 4 is connected to several conventional double-wall drill rods 3 (10-15m) in sequence, and the above connection mode is maintained until the borehole opening. The end of the borehole opening is connected to the buffer double-wall drill rod 5 and the double-wall water supply device 6 in sequence.
[0066] The core drill bit 1 has a double-walled structure. The outer wall of the core drill bit 1 has multiple jet holes 101 (four in this embodiment), with the axis of each jet hole 101 forming a 30° angle with the central axis of the drill bit. The jet holes 101 connect the inner annulus of the core drill bit 1 and the borehole annulus, allowing the flushing fluid to flow into the inner annulus of the core drill bit 1 and form a water jet with a certain velocity along the jet holes 101. The direction of the water jet is consistent with the direction of rock cuttings movement in the borehole annulus. The water jet creates a local negative pressure in the outer annulus of the core drill bit 1, causing most of the flushing fluid ejected from the core drill bit 1 to be diverted into the borehole annulus. The outer diameter of the core drill bit 1 is larger than that of a conventional double-walled drill rod 3. Specifically, the outer diameter of the core drill bit is 20mm larger than that of a conventional double-walled drill rod 3, and the borehole annulus area is 20%-40% larger than the central channel area of the drill bit, effectively increasing the proportion of flushing fluid diversion in the borehole annulus and effectively reducing the initial velocity when the core fractures.
[0067] The trajectory measurement double-walled drill rod 2 includes a rod body I201 and an inner tube I211 inside it, with an annular space I between the rod body I201 and the inner tube I211; the inner wall of the rod body I201 is provided with a fan-shaped boss 2018 with a fan-shaped cross-section; the outer wall of the rod body I201 at the fan-shaped boss 2018 is provided with a first mounting groove 2011, a second mounting groove 2012, a third mounting groove 2013 and a cylindrical groove 2014 arranged sequentially along the axial direction; the side wall of the first mounting groove 2011 is provided with a mounting through hole 2019, which connects the first mounting groove 2011 and the annular space I, and a pressure switch 216 is installed at the mounting through hole 2019; the first mounting... The acquisition board 206 and the main control board 207 are installed in the slot 2011 and then sealed by the circuit board cover 202; the battery pack 208 is installed in the second mounting slot 2012 and then sealed by the battery cover 203; the Bluetooth circuit board 209 is installed in the third mounting slot 2013 and then sealed by the Bluetooth circuit board cover 204; the Reynolds connector 210 is installed in the cylindrical slot 2014 and then sealed by the plug 205; the acquisition board 206 is equipped with a tilting module, and the acquisition board 206, the main control board 207, the battery pack 208, the Bluetooth circuit board 209, and the Reynolds connector 210 communicate with each other through a cable; the trajectory measurement double-wall drill rod 2 is made of non-magnetic steel.
[0068] The conventional double-walled drill pipe 3 includes an outer tube II301 and an inner tube II303 inside it; the outer tube II301 is threadedly connected to the rod body I201 and other outer tubes II301, and the inner tube II303 is inserted into the inner tube I211 and other inner tubes II303.
[0069] The jet double-wall drill pipe 4 includes an outer tube III and an inner tube III inside it; multiple internal spray holes 401 are evenly distributed around the side wall of the inner tube III near the core drill bit 1. In this embodiment, there are 4 internal spray holes 401, and the internal spray holes 401 form a 45° angle with the central axis of the drill bit. When the flushing fluid flows to the jet double-wall drill pipe 4, it forms a water jet with a certain speed along the internal spray holes 401. The direction of the water jet is opposite to the direction of core movement, which slows down the downward speed of the core in the large-angle upward hole; the outer tube III is threaded to the outer tube II 301 and other outer tubes III, and the inner tube III is inserted to the inner tube II 303 and other inner tubes III.
[0070] The buffered double-walled drill pipe 5 includes an outer tube IV and an inner tube IV 501 inside it; an elastic buffer pad 502, a spring 503 and a spring fixing seat 504 are arranged sequentially along the axial direction inside the rear end of the inner tube IV 501; the elastic buffer pad 502 is interference-fitted to the front end of the spring 503, the elastic buffer pad 502 has a circular through hole 5022 in the center and a slag guide groove 5023 on the edge, the rear end of the spring 503 is fixedly connected to the spring fixing seat 504, the spring fixing seat 504 has a central through hole, the spring fixing seat 504 is connected to the female head of the inner tube IV 501 and the inner tube female connector 304; the outer tube IV is threaded to the outer tube II 301 or the outer tube III, and the inner tube IV 501 is inserted into the inner tube II 303 or the inner tube III.
[0071] The inner and outer pipes of the double-walled water supply device 6 are connected to the inner pipe IV501 and the outer pipe IV, respectively.
[0072] The inclination measurement module inside the acquisition board 206 integrates a 3-axis accelerometer (X, Y, Z axes) and a 3-axis magnetometer (X, Y, Z axes) to measure the static attitude data (inclination and azimuth) of the drill string after the construction of a single drill rod in the hole during the drilling process.
[0073] The main control board 207 integrates a pressure switch 216. The main control board 207 controls the acquisition board 206 to collect data and encode and store the collected data through the pressure switch 216.
[0074] The battery pack 208 can power the main control board 207, the acquisition board 206, and the Bluetooth circuit board 209.
[0075] The Bluetooth circuit board 209 can upload the data stored in the main control board 207 to the ground computer for demodulation via Bluetooth.
[0076] The Reynolds connector 210 can charge the battery pack 208.
[0077] The Bluetooth circuit board cover 204 has a through hole in the middle. The lower part of the inner wall of the through hole has a truncated ring spring seat. Inside the through hole is a touch rod 213 with a T-shaped cross section. A limit spring 215 is fitted on the touch rod 213. The upper and lower ends of the limit spring 215 abut against the truncated ring of the touch rod 213 and the truncated ring spring seat, respectively. A limit ring 212 is installed at the upper end of the through hole, and the limit ring 212 presses against the top of the touch rod 213, compressing the limit spring 215. When the touch rod 213 is pressed further, causing the limit spring 215 to move downward, it can touch the Bluetooth switch on the Bluetooth circuit board 209. When the touch rod 213 is stopped being pressed, it can move upward under the action of the limit spring 215. The upper part of the touch rod 213 is provided with two O-rings 214 for sealing. The limit ring 212 is threadedly connected to the Bluetooth circuit board cover 204. The top of the limit ring 212 is provided with a cross-groove fixture for installation and removal.
[0078] The acquisition board 206 and the main control board 207 are fixed to the bottom surface of the first mounting slot 2011 by bolts; the battery pack 208 is fixed to the bottom surface of the second mounting slot 2012 by injection, and the battery cover plate 203 radially presses the battery pack 208 to make it stable; the Bluetooth circuit board 209 is fixed to the bottom surface of the third mounting slot 2013 by bolts; the Reynolds connector 210 is fixed in the cylindrical slot 2014 by injection; the circuit board cover plate 202, the battery cover plate 203, the Bluetooth circuit board cover plate 204 are provided with U-shaped sealing gaskets between the corresponding mounting slots and are all fixed by bolts to ensure that liquid flow will not enter the mounting slots during operation and corrode the circuit board and cables.
[0079] The first mounting slot 2011 and the second mounting slot 2012 are connected by the first cable pass hole 2015. The second mounting slot 2012 and the third mounting slot 2013 are connected by the second cable pass hole 2016. The third mounting slot 2013 and the cylindrical slot 2014 are connected by the third cable pass hole 2017. The acquisition board 206, the main control board 207, the battery pack 208, the Bluetooth circuit board 209, and the Reynolds connector 210 communicate with each other by laying cables in the first cable pass hole 2015, the second cable pass hole 2016, and the third cable pass hole 2017. After the cables are laid in the cable pass holes, they are sealed with glue.
[0080] In the conventional double-walled drill pipe 3, the outer tube II 301 has a forward spiral groove 3012 on its outer wall. During drilling, the drill bit rotates in the forward direction, which disturbs the rock cuttings in the borehole annulus space and assists in the movement of the rock cuttings out of the hole. It also utilizes the large amount of flushing fluid diverted to the borehole annulus space by the core drill bit to achieve strong mechanical-hydraulic slag removal. The inner wall of the outer tube II 301 has a first shoulder 3011 and a second shoulder 3013 at both ends. The outer tube II 301 and the inner tube II 303 are arranged coaxially.
[0081] The inner tube II 303 is connected to an inner tube male connector 302 and an inner tube female connector 304 at both ends, respectively. The inner tube male connector 302 has a first threaded section 3023 on its inner wall and a first support block 3022 on its outer wall. The inner tube female connector 304 has a second threaded section 3041 on its inner wall and a second support block 3042 on its outer wall. After the inner tube II 303 is threadedly connected to the inner tube male connector 302 and the inner tube female connector 304 at both ends, the first support block 3022 is supported on the first shoulder 3011 and the second support block 3042 is supported on the second shoulder 3013. The outline dimensions of the first support block 3022 are consistent with the outline dimensions of the first shoulder 3011 and the outline dimensions of the second support block 3042 are consistent with the outline dimensions of the second shoulder 3013, ensuring the coaxiality of the inner tube II 303 and the outer tube II 301.
[0082] The connection between the outer tubes II301 is a threaded connection, and the connection between the inner tubes II303 is a plug-in connection. The male connector 302 of the inner tube is provided with a double sealing ring groove 3021. The sealing performance of the male connector 302 of the inner tube and the female connector 304 of the inner tube is ensured by arranging two O-rings.
[0083] The structural dimensions of the jet double-wall drill pipe 4 are the same as those of the conventional double-wall drill pipe 3. The outer tube III and the outer tube II 301 have the same structure. The inner tube III and the inner tube male connector 302 and inner tube female connector 304 at both ends have the same structure as the inner tube II 303 and the inner tube male connector 302 and inner tube female connector 304 at both ends.
[0084] The outer tube IV of the buffer double-wall drill pipe 5 has the same structure as the outer tube II 301. The inner tube male connector 302 of the inner tube IV 501 has the same structure as the inner tube male connector 302 of the inner tube II 303. One end of the inner tube IV 501 is a male head and the other end is a female head. The lower end of the spring 503 is welded and fixed to the spring fixing seat 504. The spring fixing seat 504 is threadedly connected to the female head of the inner tube IV 501. The inner tube female connector 304 of the inner tube IV 501 is threadedly connected to the spring fixing seat 504.
[0085] The elastic buffer pad 502 is made of soft rubber material. Four fan-shaped bodies 5021 are evenly spaced around the circumference of the elastic buffer pad 502, and a cuttings guide groove 5023 is between every two fan-shaped bodies 5021. When the rock core blocks the circular through hole 5022 of the elastic buffer pad 502, the flushing fluid and rock cuttings in the drill bit inner tube enter the central through hole along the cuttings guide groove 5023. The rear end of the elastic buffer pad 502 is provided with a first ring platform 5024, and the upper end of the spring 503 is inserted into and pressed against the first ring platform 5024.
[0086] The outer walls of both ends of the spring fixing seat 504 are provided with a first male thread 5041 and a second male thread 5043. The spring fixing seat 504 is provided with a second annular platform 5042 inside. The rear end of the spring 503 is welded and fixed to the second annular platform 5042. The central through hole of the spring fixing seat 504 is an annular slag guide port 5044.
[0087] Example 2:
[0088] This embodiment provides a method for continuous coring and trajectory measurement at high elevation angles in coal mines. This method is implemented using the coal mine continuous coring drill assembly with trajectory measurement function as described in Embodiment 1, and includes the following steps:
[0089] Step 1: Connect the core drill bit, trajectory measurement double-wall drill rod, conventional double-wall drill rod, jet double-wall drill rod, buffer double-wall drill rod, and double-wall water supply device in sequence. Use the drilling rig to lower the drill string assembly into the core borehole to be constructed at a large elevation angle (≥60°). The flushing fluid enters sequentially through the water inlet on the side of the double-wall water supply device, then through the inner annulus of the buffer double-wall drill rod, jet double-wall drill rod, conventional double-wall drill rod, trajectory measurement double-wall drill rod, and finally the inner annulus of the core drill bit. The flushing fluid is ejected from the jet hole and the outlet at the bottom of the core drill bit. The flushing fluid is then generated by the water jet from the side wall of the core drill bit. Due to the negative pressure effect and the large proportion of the borehole annulus area, most of the flushing fluid sprayed from the bottom outlet of the core drill bit will be diverted into the borehole annulus. During construction, the drill bit rotates in the forward direction, and the forward spiral groove disturbs the rock cuttings in the borehole annulus. The large amount of flushing fluid diverted into the borehole annulus achieves a strong mechanical-hydraulic slag removal effect. At the same time, when the flushing fluid flows to the annulus inside the trajectory measurement double-wall drill rod, the pressure switch is activated, and the main control board controls the acquisition board to collect tilt and azimuth data. Three sets of data are collected at 1-second intervals. After the data collection is completed, the acquisition board goes into sleep mode, and the main control board encodes and stores the collected data.
[0090] Step 2: The core drill bit grinds and breaks the bottom rock layer. Due to the small amount of flushing fluid diverted to the central channel of the drill bit, the flushing fluid has a small pushing force on the rock core, resulting in a low initial velocity after the rock core breaks. Under its own gravity, the rock core slides down into the inner tube IV of the buffer double-wall drill pipe. The rock core impacts the elastic buffer pad and compresses the spring, which plays a role in buffering, decelerating, braking and collecting the descending rock core. At the same time, the rock cuttings and flushing fluid accompanying the rock core enter the circular through hole through the slag guide groove on the elastic buffer pad, and enter the inner tube female joint of the inner tube IV through the central through hole of the spring fixing seat, and finally return along the outlet of the tail of the double-wall water feeder.
[0091] Step 3: After completing the core sampling of one drill rod length, stop the pump and drilling, disassemble the buffer double-wall drill rod, and empty all the rock core collected inside the buffer double-wall drill rod. Add a regular double-wall drill rod and connect it to the buffer double-wall drill rod. Repeat the above steps until the length of the added regular double-wall drill rod reaches 10-15m. This is to prevent the rock core from sliding too far or too fast, which could damage the elastic buffer pad and spring, and also to prevent the rock core from being broken together. A jet double-wall drill rod needs to be added so that when the flushing fluid flows to the jet double-wall drill rod, it forms a water jet with a certain speed along the inner nozzle. The direction of the water jet is opposite to the direction of rock core movement, which slows down the downward speed of the rock core. By repeating the above steps, continuous coring boreholes with large elevation angles can be constructed safely and efficiently. At the same time, the pump needs to be turned on every time a drill rod is added for construction, and the pressure switch is activated again to collect and store data such as the current borehole depth, inclination angle, and azimuth angle.
[0092] Step 4: After the single core drilling is completed, remove the drill string from the hole and disassemble the trajectory measurement double-wall drill rod. Use a tool to press the touch lever until the touch lever moves downward and touches the Bluetooth switch on the Bluetooth circuit board. The instrument's Bluetooth is activated. At this time, it can pair with the explosion-proof computer downhole via Bluetooth, or it can raise the trajectory measurement double-wall drill rod to the surface and pair with the surface computer via Bluetooth. After successful pairing, the stored borehole trajectory data can be retrieved, decoded, and processed through specific software.
Claims
1. A coal mine downhole large angle continuous coring drill assembly with trajectory measurement function, characterized in that, It includes a core drill bit (1) connected in sequence, a trajectory measurement double-wall drill rod (2), multiple conventional double-wall drill rods (3), multiple jet double-wall drill rods (4), a buffer double-wall drill rod (5), and a double-wall water delivery device (6). The core drill bit (1) has a double-wall structure. The outer wall of the core drill bit (1) is provided with multiple jet holes (101) and the axis of the jet holes (101) forms a 30° angle with the central axis of the drill bit. The jet holes (101) connect the inner annulus of the core drill bit (1) and the borehole annulus. The outer diameter of the core drill bit (1) is larger than that of a conventional double-wall drill rod (3). The trajectory measurement double-wall drill rod (2) includes a rod body I (201) and an inner tube I (211) inside it, with an annular space I between the rod body I (201) and the inner tube I (211); the inner wall of the rod body I (201) is provided with a fan-shaped boss (2018) with a fan-shaped cross section; the outer wall of the rod body I (201) at the fan-shaped boss (2018) is provided with a first mounting groove (2011), a second mounting groove (2012), a third mounting groove (2013) and a cylindrical groove (2014) arranged sequentially along the axial direction; the side wall of the first mounting groove (2011) is provided with a mounting through hole (2019), which connects the first mounting groove (2011) and the annular space I, and a pressure switch is installed at the mounting through hole (2019). The first mounting slot (2011) is sealed by a circuit board cover (202) after the acquisition board (206) and main control board (207) are installed in the first mounting slot (2011); the second mounting slot (2012) is sealed by a battery cover (203) after the battery pack (208) is installed in the second mounting slot (2012); the third mounting slot (2013) is sealed by a Bluetooth circuit board cover (204) after the Bluetooth circuit board (209) is installed in the third mounting slot (2013); the cylindrical slot (2014) is sealed by a plug (205) after the Reynolds connector (210) is installed in the cylindrical slot (2014); the acquisition board (206) is equipped with an inclination measurement module, and the acquisition board (206), main control board (207), battery pack (208), Bluetooth circuit board (209), and Reynolds connector (210) communicate with each other through cables; The conventional double-walled drill pipe (3) includes an outer tube II (301) and an inner tube II (303) inside it; the first section of the outer tube II (301) near the core drill bit (1) is threadedly connected to the rod body I (201) and other outer tubes II (301), and the first section of the inner tube II (303) near the core drill bit (1) is inserted into the inner tube I (211) and other inner tubes II (303); The jet double-wall drill rod (4) includes an outer tube III and an inner tube III inside it; multiple internal spray holes (401) are evenly distributed around the side wall of the inner tube III near the core drill bit (1), and the internal spray holes (401) form a 45° angle with the central axis of the drill bit; the first section of the outer tube III near the core drill bit (1) is threadedly connected to the outer tube II (301) and other outer tubes III, and the first section of the inner tube III near the core drill bit (1) is inserted into the inner tube II (303) and other inner tubes III; The buffer double-walled drill pipe (5) includes an outer tube IV and an inner tube IV (501) inside it; an elastic buffer pad (502), a spring (503) and a spring fixing seat (504) are arranged sequentially along the axial direction inside the rear end of the inner tube IV (501); the elastic buffer pad (502) is interference-fitted to the front end of the spring (503), the center of the elastic buffer pad (502) is provided with a circular through hole (5022) and the edge is provided with a slag guide groove (5023), the rear end of the spring (503) is fixedly connected to the spring fixing seat (504), the spring fixing seat (504) is provided with a central through hole, the spring fixing seat (504) is connected to the female head of the inner tube IV (501) and the female connector (304) of the inner tube; the outer tube IV is threadedly connected to the outer tube II (301) or the outer tube III, and the inner tube IV (501) is inserted into the inner tube II (303) or the inner tube III; The inner and outer pipes of the double-walled water supply device (6) are connected to the inner pipe IV (501) and the outer pipe IV, respectively.
2. The high angle of deviation continuous coring drill assembly with trajectory measurement function for underground coal mine as claimed in claim 1, wherein, The inclination measurement module in the acquisition board (206) integrates a 3-axis accelerometer and a 3-axis magnetometer to measure the static attitude data of the drill bit after the construction of a single drill rod in the hole is completed during the drilling process; The main control board (207) integrates the pressure switch (216). The main control board (207) controls the acquisition board (206) to collect data and encode and store the collected data through the pressure switch (216). The battery pack (208) can power the main control board (207), the acquisition board (206), and the Bluetooth circuit board (209); The Bluetooth circuit board (209) can upload the data stored in the main control board (207) to the ground computer for demodulation via Bluetooth; The Reynolds connector (210) can charge the battery pack (208).
3. The high angle of deviation continuous coring drill assembly with trajectory measurement function for underground coal mine as claimed in claim 1, wherein, The Bluetooth circuit board cover (204) has a through hole in the middle, and a frustum-shaped spring seat is provided on the lower part of the inner wall of the through hole. A touch rod (213) with a T-shaped cross section is provided inside the through hole. A limit spring (215) is fitted on the touch rod (213). The upper and lower ends of the limit spring (215) abut against the frustum and the frustum-shaped spring seat of the touch rod (213) respectively. A limit ring (212) is installed at the upper end of the through hole and the limit ring (212) presses against the top of the touch rod (213); when pressed... When the touch lever (213) compresses the limiting spring (215) and moves downward, it can touch the Bluetooth switch on the Bluetooth circuit board (209). When the touch lever (213) is stopped, it can move upward under the action of the limiting spring (215). The upper part of the touch lever (213) is provided with two O-rings (214) for sealing. The limiting ring (212) is threadedly connected to the cover plate (204) of the Bluetooth circuit board. The top of the limiting ring (212) is provided with a cross groove tool for installation and removal.
4. The high angle of deviation continuous coring drill assembly with trajectory measurement function for underground coal mine as claimed in claim 1, wherein, The acquisition board (206) and the main control board (207) are fixed to the bottom of the first mounting slot (2011) by bolts; the battery pack (208) is fixed to the bottom of the second mounting slot (2012) by injection, and the battery cover (203) radially presses the battery pack (208) to make it stable; the Bluetooth circuit board (209) is fixed to the bottom of the third mounting slot (2013) by bolts; the Reynolds connector (210) is fixed in the cylindrical groove (2014) by injection; the circuit board cover (202), the battery cover (203), the Bluetooth circuit board cover (204) are provided with U-shaped sealing gaskets between the corresponding mounting slots and are all fixed by bolts to ensure that liquid flow will not enter the mounting slot and corrode the circuit board and cables during operation.
5. The high angle underground coal core bit assembly with trajectory measurement function according to claim 1, wherein, The first mounting slot (2011) and the second mounting slot (2012) are connected through the first wire hole (2015), the second mounting slot (2012) and the third mounting slot (2013) are connected through the second wire hole (2016), and the third mounting slot (2013) and the cylindrical slot (2014) are connected through the third wire hole (2017). The acquisition board (206), the main control board (207), the battery pack (208), the Bluetooth circuit board (209), and the Reynolds connector (210) communicate with each other by laying cables through the first wire hole (2015), the second wire hole (2016), and the third wire hole (2017). After the cables are laid in the wire holes, they are sealed with glue.
6. The high angle underground coal core bit assembly with trajectory measurement function according to claim 1, wherein, In the conventional double-walled drill pipe (3), the outer wall of the outer tube II (301) is provided with a positive spiral groove (3012); the inner walls of the outer tube II (301) are provided with a first shoulder (3011) and a second shoulder (3013) at both ends; the outer tube II (301) and the inner tube II (303) are arranged coaxially. The inner tube II (303) is connected to an inner tube male connector (302) and an inner tube female connector (304) at both ends respectively; the inner tube male connector (302) has a first threaded section (3023) on its inner wall and a first support block (3022) on its outer wall, and the inner tube female connector (304) has a second threaded section (3041) on its inner wall and a second support block (3042) on its outer wall; the inner tube II (303) is connected to the inner tube male connector (302) and the inner tube female connector (304) at both ends respectively. 304) After the threaded connection, the first support block (3022) is supported on the first shoulder (3011), and the second support block (3042) is supported on the second shoulder (3013); the outline dimensions of the first support block (3022) are consistent with the outline dimensions of the first shoulder (3011), and the outline dimensions of the second support block (3042) are consistent with the outline dimensions of the second shoulder (3013), ensuring the coaxiality of the inner tube II (303) and the outer tube II (301); The structural dimensions of the jet double-wall drill pipe (4) are the same as those of the conventional double-wall drill pipe (3). The outer tube III and the outer tube II (301) have the same structure. The inner tube III and the inner tube male connector (302) and inner tube female connector (304) at both ends have the same structure as the inner tube II (303) and the inner tube male connector (302) and inner tube female connector (304) at both ends.
7. The high-dip continuous coring drill assembly with trajectory measurement function in underground coal mine according to claim 6, characterized in that, The outer tube IV of the buffer double-wall drill rod (5) has the same structure as the outer tube II (301), and the inner tube male connector (302) of the inner tube IV (501) has the same structure as the inner tube male connector (302) of the inner tube II (303); one end of the inner tube IV (501) is a male head and the other end is a female head; the lower end of the spring (503) is welded and fixed to the spring fixing seat (504), the spring fixing seat (504) is threadedly connected to the female head of the inner tube IV (501), and the inner tube female connector (304) of the inner tube IV (501) is threadedly connected to the spring fixing seat (504).
8. The high angle of deviation continuous coring drill assembly with trajectory measurement capability of claim 1, wherein, The elastic buffer pad (502) is made of soft rubber material. Four fan-shaped bodies (5021) are evenly spaced around the elastic buffer pad (502). Between every two fan-shaped bodies (5021) is a slag guide groove (5023). When the rock core blocks the circular through hole (5022) of the elastic buffer pad (502), the flushing fluid and rock cuttings in the inner tube of the drill bit enter the central through hole along the slag guide groove (5023). The rear end of the elastic buffer pad (502) is provided with a first ring platform (5024). The upper end of the spring (503) is inserted into and pressed against the first ring platform (5024).
9. The high angle underground coal core bit assembly with trajectory measurement function according to claim 1, wherein, The outer walls of both ends of the spring fixing seat (504) are provided with a first male thread (5041) and a second male thread (5043). The spring fixing seat (504) is provided with a second annular platform (5042) inside. The rear end of the spring (503) is welded and fixed on the second annular platform (5042). The central through hole of the spring fixing seat (504) is an annular slag guide port (5044).
10. A method for continuous coring and trajectory measurement in a coal mine at a large angle of inclination, characterized in that, This method employs the coal mine underground high-angle continuous coring drill assembly with trajectory measurement function as described in claim 3, and includes the following steps: Step 1: The drill string assembly is lowered into the high-angle coring borehole to be drilled. The flushing fluid enters sequentially through the water inlet on the side of the double-wall water feeder, the inner annulus of the buffer double-wall drill rod, the inner annulus of the jet double-wall drill rod, the inner annulus of the conventional double-wall drill rod, the inner annulus of the trajectory measurement double-wall drill rod, and the inner annulus of the coring drill bit. The flushing fluid is sprayed out from the jet hole and the outlet at the bottom of the coring drill bit. At the same time, when the flushing fluid flows to the inner annulus of the trajectory measurement double-wall drill rod, the pressure switch is activated, and the main control board controls the acquisition board to collect tilt and azimuth data. Three sets of data are collected at 1-second intervals. After the data collection is completed, the acquisition board goes into sleep mode, and the main control board encodes and stores the collected data. Step 2: The core drill bit grinds and breaks off the bottom rock layer. Under its own gravity, the core slides down into the inner tube IV of the buffer double-wall drill rod. The core impacts the elastic buffer pad and compresses the spring, which buffers, slows down, brakes and collects the descending core. At the same time, the rock cuttings and flushing fluid accompanying the core enter the circular through hole through the slag guide groove on the elastic buffer pad, and enter the inner tube female joint of the inner tube IV through the central through hole of the spring fixing seat. Finally, it returns along the outlet of the tail of the double-wall water feeder. Step 3: After completing the core sampling for one drill rod length, stop the pump and drilling, disassemble the buffer double-wall drill rod, and pour out all the rock core collected inside the buffer double-wall drill rod. Add a conventional double-wall drill rod and connect it to the buffer double-wall drill rod. Repeat the above steps until the length of the added conventional double-wall drill rod reaches 10-15m. Then, add a jet double-wall drill rod so that when the flushing fluid flows to the jet double-wall drill rod, it forms a water jet along the inner nozzle. The direction of the water jet is opposite to the direction of rock core movement, which slows down the downward speed of the rock core. At the same time, the pump must be turned on every time a drill rod is added for construction. The pressure switch is activated again to collect and store the current borehole depth, dip angle, and azimuth angle. Step 4: After the single core drilling is completed, remove the drill string from the hole and disassemble the trajectory measurement double-wall drill rod. Press the touch lever until it moves down to touch the Bluetooth switch on the Bluetooth circuit board. The instrument's Bluetooth is activated. At this time, it can pair with the explosion-proof computer downhole via Bluetooth, or it can raise the trajectory measurement double-wall drill rod to the surface to pair with the surface computer via Bluetooth. After successful pairing, the stored borehole trajectory data can be retrieved, decoded, and processed.