A real-time monitoring device, method, and system for downhole boreholes

Abstract

This invention discloses a real-time monitoring device, method, and system for downhole drilling. The device includes a monitoring mechanism, a signal processor, a surface controller, and a first housing. The monitoring mechanism includes a drive shaft, an end cap, and at least two samplers. The drive shaft passes through the end cap and can be connected to a drive unit and a drill pipe. At least two samplers are circumferentially arranged on the end cap, distributed from high to low. Each sampler includes an induction coil laterally disposed inside the end cap. Vertically evenly arranged magnetic columns are embedded in the side wall of the drive shaft, which can rotate through the end cap to generate electrical pulse signals from the induction coil. The first housing is fixed to the inner wall of the wellbore, the monitoring mechanism is disposed within the first housing, and the end cap is fixed to the first housing. The signal processor is connected to both the samplers and the surface controller. This device uses electromagnetic induction technology to monitor downhole drilling depth and speed in real time, accurately reflecting the downhole drilling situation.

Description

Technical Field

[0001] This invention relates to the field of oil and gas well completion technology, and in particular to a downhole borehole real-time monitoring device, method and downhole borehole system. Background Technology

[0002] In the current oil and gas exploration and development process, the final step is to connect the oil reservoir to the wellbore in order to extract the oil and gas resources within the reservoir. The commonly used method for connecting the wellbore and the oil reservoir is explosive perforation, but this method generally has two shortcomings:

[0003] Firstly, the perforation depth is short. Currently, commonly used 5 1 / 2″ and smaller casing wells are limited by wellbore size and generally use 89 perforating cartridges, with a penetration depth of only 0.5 to 0.7 meters, making it difficult to form an efficient drainage channel. Secondly, perforation can cause secondary pollution to the oil reservoir, creating a compaction effect, with the permeability of the compacted zone decreasing by more than 70%. These problems will affect the development and production of oil and gas wells.

[0004] To address the shortcomings of traditional perforation technology, radial horizontal well technology and deep penetration drilling technology have been widely used in recent years in some key well areas to replace traditional perforation for well completion, aiming to achieve better results. For example, in radial horizontal well technology, during downhole drilling operations, the surface high-pressure water pump system generates high-pressure water flow, which enters the downhole high-pressure hose and jet drill bit through coiled tubing, forming a high-pressure water jet to cut through the rock formation and carry out drilling. However, as the borehole length increases, the surface can only rely on experience data to continuously lower the tubing to ensure the continuity of the drilling process, and the lowering speed is used as the downhole drilling speed. The cumulative tubing length is taken as the downhole borehole length. At this time, if abnormal situations such as downhole hose accumulation occur, the downhole borehole length obtained from the cumulative tubing length will be inaccurate. Summary of the Invention

[0005] To enrich the product range of downhole borehole monitoring devices and increase the selection of downhole borehole monitoring methods, this invention proposes a downhole borehole real-time monitoring device, method, and downhole borehole system.

[0006] In a first aspect, embodiments of the present invention provide a downhole borehole real-time monitoring device, comprising a monitoring mechanism, a signal processor, a ground controller, and a first housing;

[0007] The monitoring mechanism includes a drive shaft, an end cap, and at least two samplers;

[0008] The drive shaft passes through the end cap;

[0009] The drive shaft can be connected to the drive device and the drill rod respectively, and the drive shaft can rotate and move axially under the drive of the drive device;

[0010] The at least two samplers are circumferentially arranged on the end cap and distributed sequentially from high to low;

[0011] The sampler includes an induction coil arranged laterally inside the end cap, and vertically evenly arranged magnetic columns are embedded in the side wall of the drive shaft. The drive shaft can rotate through the end cap to make the induction coil generate an electrical pulse signal.

[0012] The first housing can be fixed to the inner wall of the wellbore, the monitoring mechanism is disposed inside the first housing, and the end cap is fixed to the first housing;

[0013] The signal processor is connected to both the sampler and the ground controller.

[0014] In one or more alternative embodiments, the drive shaft is made of a non-magnetic metal;

[0015] The magnetic column is made of a strongly magnetic material.

[0016] In one or more alternative embodiments, the at least two samplers are equidistantly distributed in a spiral-ascending manner on the end cap.

[0017] In one or more alternative embodiments, the number of samplers is three.

[0018] In one or more alternative embodiments, the sampler further includes a conduit;

[0019] The end of the conduit is connected to the signal processor;

[0020] The conduit is used to accommodate the wires between the sampler and the signal processor.

[0021] In one or more alternative embodiments, the sampler further includes a sealing connector;

[0022] The sealing joint is used to seal the connection between the conduit and the end cap, so as to seal the induction coil inside the end cap.

[0023] In one or more alternative embodiments, the signal processor includes a second housing, a signal amplifier disposed within the second housing, and a waveform trimmer;

[0024] The second housing is disposed above the first housing;

[0025] The signal amplifier is connected to the sampler and the waveform trimmer, respectively.

[0026] The waveform trimmer is connected to the ground display.

[0027] In one or more alternative embodiments, the outer wall of the first housing is provided with an anchoring mechanism;

[0028] The anchoring mechanism is used to fix the first housing to the inner wall of the wellbore.

[0029] In a second aspect, embodiments of the present invention provide a method for real-time monitoring of downhole boreholes, using the downhole borehole real-time monitoring device described in the first aspect, comprising:

[0030] The drive shaft rotates downwards;

[0031] The sampler collects electrical pulse signals and transmits the collected electrical pulse signals to the signal processor for signal processing.

[0032] The processed electrical pulse signal is transmitted to the ground controller, which calculates the drilling depth and drilling speed based on the cumulative number of pulses and the pulse generation time.

[0033] Thirdly, embodiments of the present invention provide a downhole drilling system, including the downhole drilling real-time monitoring device, drive device, drill pipe, drill bit, steering gear and cylinder described in the first aspect;

[0034] The drive shaft is connected to the drive device and the drill rod respectively. The drill rod is connected to the drill bit. The drive device can drive the drive shaft to rotate downward.

[0035] The drill rod is a semi-rigid drill rod, and the guide groove is provided in the steering device. The drill rod can pass through the guide groove to change the drilling direction from vertical to horizontal.

[0036] The cylinder is disposed inside the first housing and fixed to the upper part of the end cap, and the driving device is disposed inside the cylinder;

[0037] The drive unit is connected to the ground controller.

[0038] In one or more alternative embodiments, the steering gear is disposed within the first housing;

[0039] The first housing has a through hole on its side wall, through which the drill rod can extend.

[0040] In one or more alternative embodiments, the downhole drilling system further includes a coupling;

[0041] The coupling is used to connect the drive shaft and the drill rod;

[0042] The outer wall of the coupling has a square groove.

[0043] The beneficial effects of the above-mentioned technical solutions provided in the embodiments of the present invention include at least the following:

[0044] The downhole borehole real-time monitoring device provided in this embodiment of the invention uses electromagnetic induction technology to monitor the downhole borehole depth and drilling speed in real time. Through the distribution and arrangement of induction coils and magnetic columns, an electrical pulse signal is generated when the drive shaft rotates at high speed through the end cap. The distance of the drive shaft moving up or down can be obtained based on the acquired electrical pulse signal, thereby obtaining the downhole borehole depth and drilling speed. The sampler and magnetic column are not affected by environmental factors such as downhole water pressure and water quality, and the obtained monitoring data is accurate and reliable. Furthermore, because the induction coil is arranged horizontally, an electrical pulse signal is only generated when the drive shaft rotates at high speed through the induction coil, and almost no signal is generated when it passes through in a straight line, thus avoiding the generation of false signals.

[0045] The downhole borehole real-time monitoring device provided in this embodiment of the invention has samplers arranged circumferentially on the end cap and distributed sequentially from high to low, while magnetic columns are vertically and evenly distributed on the drive shaft. Therefore, by the sequence of electrical pulse signals generated by each sampler, the direction of movement of the drive shaft can be determined, and thus the drive shaft can be determined to be drilling or resetting.

[0046] The downhole borehole real-time monitoring device provided in this embodiment of the invention can achieve the required monitoring range and resolution accuracy by reasonably setting the number and density of magnetic columns, and is suitable for different drilling conditions.

[0047] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.

[0048] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0049] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0050] Figure 1 This is a schematic diagram of the external structure of the downhole borehole real-time monitoring device provided in an embodiment of the present invention;

[0051] Figure 2 This is a schematic diagram of the internal structure of the downhole borehole real-time monitoring device provided in an embodiment of the present invention;

[0052] Figure 3 This is a schematic diagram showing the distribution of the sampler and magnetic column provided in an embodiment of the present invention;

[0053] Figure 4This is a schematic diagram of the sampler provided in an embodiment of the present invention;

[0054] Figure 5 This is a circuit block diagram of the downhole borehole real-time monitoring device provided in an embodiment of the present invention.

[0055] In the picture:

[0056] 1 is the monitoring mechanism, 11 is the drive shaft, 111 is the magnetic column, 12 is the end cap, 13 is the sampler, 131 is the induction coil, 132 is the conduit, and 133 is the sealing joint.

[0057] 2 is the signal processor, 21 is the second housing, 22 is the signal amplifier, and 23 is the waveform trimmer;

[0058] 3 is the ground controller;

[0059] 4 represents the first shell, and 41 represents the through hole;

[0060] 51 is the drill rod, 52 is the drill bit, 53 is the steering gear, 531 is the guide groove, 54 is the cylinder, 55 is the coupling, 551 is the square groove, 56 is the cable, and 57 is the winding device. Detailed Implementation

[0061] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0062] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "far," "near," "front," and "rear," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0063] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0064] The inventors discovered that well completion technologies such as radial horizontal well technology and deep penetration drilling technology have a problem to varying degrees in practical applications: the drilling speed and drilling depth cannot be accurately and timely determined from the surface.

[0065] Based on this, embodiments of the present invention provide a downhole borehole real-time monitoring device, method, and downhole borehole system, which will be described in detail below through specific embodiments.

[0066] Example 1

[0067] This invention provides a real-time monitoring device for downhole boreholes, referring to... Figures 1-4 As shown, it includes a monitoring unit 1, a signal processor 2, a ground controller 3, and a first housing 4;

[0068] Monitoring device 1 includes a drive shaft 11, an end cap 12, and at least two samplers 13;

[0069] The drive shaft 11 passes through the end cover 12;

[0070] The drive shaft 11 can be connected to the drive device (not shown in the figure) and the drill rod 51 respectively. The drive shaft 11 can rotate and move axially under the drive of the drive device.

[0071] At least two samplers 13 are arranged circumferentially on the end cap 12 and distributed sequentially from high to low;

[0072] The sampler 13 includes an induction coil 131 arranged laterally inside the end cover 12, and vertically evenly arranged magnetic columns 111 are embedded in the side wall of the drive shaft 11. The drive shaft 11 can rotate through the end cover 12 so that the induction coil 131 generates an electrical pulse signal.

[0073] The first housing 4 can be fixed to the inner wall of the well barrel, the monitoring mechanism 1 is set inside the first housing 4, and the end cap 12 is fixed to the first housing 4;

[0074] The signal processor 2 is connected to the sampler 13 and the ground controller 3 respectively.

[0075] In this embodiment of the invention, the transmission shaft 11 is made of a non-magnetic metal, while the magnetic column 111 is made of a strongly magnetic material, to ensure that the induction coil 131 can generate stable and accurate electrical pulse signals. The specific types of non-magnetic metals and strongly magnetic materials are common knowledge in the art and can be found in detailed descriptions in the prior art; therefore, they will not be elaborated upon here.

[0076] In this embodiment of the invention, since the induction coil 131 is arranged laterally relative to the drive shaft 11, the induction coil 131 will only generate an electrical pulse signal when the magnetic column 111 embedded on the drive shaft 11 passes laterally through the sampler 13. Therefore, the induction coil 131 will only generate intermittent electrical pulse signals when the drive shaft 11 rotates at high speed through the end cover 12. When the drive shaft 11 passes through the end cover 12 in a straight line, no electrical pulse signal will be generated or only a very weak electrical pulse signal will be generated. This avoids the generation of false signals when the drive shaft 11 moves relative to the end cover 12 due to vibration, thereby improving the monitoring accuracy.

[0077] In this embodiment of the invention, the resolution accuracy of the monitoring mechanism 1 can be adjusted by changing the number and spacing of the magnetic columns 111. Therefore, the number of magnetic columns 111 and the spacing between adjacent magnetic columns 111 can be appropriately distributed according to the actual required resolution accuracy. The length of the transmission shaft 11 can also be reasonably set according to the actual drilling conditions, ensuring that the downhole borehole real-time monitoring device provided by the present invention can be widely applied to various drilling conditions.

[0078] In one specific embodiment, reference is made to Figure 3 As shown, since the samplers 13 are circumferentially arranged on the end cap 12 and distributed sequentially from high to low, while the magnetic columns 111 are vertically and evenly distributed on the drive shaft 11, the direction of movement of the drive shaft 11 can be determined by the sequence of electrical pulse signals generated by each sampler 13, thereby determining whether the drive shaft 11 is drilling or resetting. Preferably, the number of samplers 13 can be set to three to ensure the accuracy of the direction of movement determination. In this embodiment, taking three samplers 13 as an example, from high to low, they are the first sampler 13, the second sampler 13, and the third sampler 13. When the drive shaft 11 rotates and extends (drills), the magnetic column 111 passes through the first sampler 13, the second sampler 13, and the third sampler 13 in sequence, generating corresponding electrical pulse signals. When the drive shaft 11 rotates and retracts (resets), the magnetic column 111 passes through the third sampler 13, the second sampler 13, and the first sampler 13 in sequence, generating corresponding electrical pulse signals. Therefore, by observing the order in which the electrical pulse signals generated by each sampler 13 are generated, it is possible to determine whether the drill pipe 51 is drilling or resetting. Compared to setting two or more samplers 13, setting three samplers 13 can ensure accurate determination of whether the drive shaft 11 is drilling or resetting while also controlling costs.

[0079] In one specific embodiment, reference is made to Figure 3 As shown, at least two samplers 13 can be distributed equidistantly in a spiral-ascending manner on the end cap 12 to stabilize the interval between the electrical pulse signals generated by adjacent samplers 13, which facilitates the calculation of drilling depth and drilling speed.

[0080] In one specific embodiment, reference is made to Figure 2 and Figure 4 As shown, the sampler 13 also includes a conduit 132 and a sealing connector 133. One end of the sealing connector 133 is connected to the conduit 132, and the other end is fixed to the side wall of the end cap 12. The end of the conduit 132 is connected to the signal processor 2. The wire between the induction coil 131 and the signal processor 2 is housed in the conduit 132. Thus, the induction coil 131 is sealed inside the end cap 12, and the wire is sealed, which isolates the induction coil 131 and the wire from the external environment and enables them to withstand the high pressure downhole, ensuring the safety and monitoring stability of the sampler 13.

[0081] In one specific embodiment, reference is made to Figure 1 , Figure 2 and Figure 5 As shown, the signal processor 2 may include a signal amplifier 22 and a waveform trimmer 23. The signal amplifier 22 is connected to the sampler 13 via a wire, and the waveform trimmer 23 is connected to the ground controller 3 via a cable 56. The electrical pulse signal generated by the sampler 13 can be transmitted to the signal amplifier 22. After the signal amplifier 22 amplifies the signal, it is transmitted to the waveform trimmer 23 to trim the signal waveform, transforming the original signal into a rectangular pulse. Finally, it is transmitted to the ground controller 3 via the cable 56, and the ground controller 3 can display the rectangular pulse waveform in real time.

[0082] In one specific embodiment, reference is made to Figure 1 As shown, a cable winder 57 is also provided around the ground controller 3, and the cable 56 can be wound around the cable winder 57 to avoid tangling or messiness.

[0083] In one specific embodiment, reference is made to Figure 1 As shown, the signal processor 2 may also include a second housing 21, and the signal amplifier 22 and the waveform trimmer 23 are both disposed inside the second housing 21.

[0084] In one specific embodiment, an anchoring mechanism (not shown in the figure) is provided on the outer wall of the first housing 4, which is used to fix the first housing 4 to the inner wall of the wellbore. The second housing 21 may be disposed above the first housing 4. The specific structure and arrangement of the anchoring mechanism are well known to those skilled in the art and can be referred to in detail in the prior art, and will not be repeated here.

[0085] In one specific embodiment, the process of monitoring downhole drilling depth and drilling speed using the downhole drilling real-time monitoring device provided by the present invention may include:

[0086] The drive unit drives the transmission shaft 11 to rotate and extend, so that the transmission shaft 11 rotates through the end cover 12;

[0087] The induction coil 131 of the sampler 13 generates electromagnetic induction with the magnetic column 111, thereby generating an electrical pulse signal;

[0088] The electrical pulse signal is transmitted to the signal amplifier 22, which amplifies the electrical pulse signal before transmitting it to the waveform trimmer 23.

[0089] The electrical pulse signal is shaped into a rectangular pulse by the waveform trimmer 23 and then transmitted to the ground controller 3.

[0090] The ground controller 3 displays a rectangular pulse waveform and calculates the drilling depth and drilling speed based on the cumulative number of pulses and the pulse interval time.

[0091] In this embodiment, the drive device can also drive the transmission shaft 11 to retract, and the downhole drilling real-time monitoring device provided by the present invention can also be used to monitor the displacement and speed of the transmission shaft 11 during resetting.

[0092] The downhole drilling real-time monitoring device provided in this embodiment of the invention uses electromagnetic induction technology to monitor the downhole drilling depth and drilling speed in real time. Through the distribution of the induction coil 131 and the magnetic column 111, the drive shaft 11 generates an electrical pulse signal when it rotates at high speed through the end cap 12. The distance of the drive shaft 11 moving up or down can be obtained from the acquired electrical pulse signal, thereby obtaining the downhole drilling depth and drilling speed. The sampler 13 and the magnetic column 111 are not affected by environmental factors such as downhole water pressure and water quality, and the obtained monitoring data is accurate and reliable. Furthermore, since the induction coil 131 is arranged horizontally, an electrical pulse signal is only generated when the drive shaft 11 rotates at high speed through the induction coil 131, and almost no signal is generated when it passes through in a straight line, thus avoiding the generation of false signals.

[0093] The downhole drilling real-time monitoring device provided in this embodiment of the invention uses a sampler 13 to monitor the displacement of the magnetic column 111 on the drive shaft 11 in real time and generate an electrical pulse signal. After the signal processor 2 processes the signal, it sends the signal back to the ground controller 3 through the cable 56. This accurately and quickly reflects the downhole drilling speed and drilling distance, effectively solving the technical problem that the downhole drilling speed and drilling depth cannot be accurately and timely grasped from the ground in radial horizontal well technology and deep penetration drilling technology.

[0094] Example 2

[0095] Based on the same inventive concept, this invention also provides a method for real-time monitoring of downhole boreholes, using the downhole borehole real-time monitoring device described in Embodiment 1, including:

[0096] S101: Drive the transmission shaft 11 to rotate downwards;

[0097] S102: The sampler 13 collects electrical pulse signals and transmits the collected electrical pulse signals to the signal processor 2 for signal processing;

[0098] S103: The processed electrical pulse signal is transmitted to the ground controller 3. The ground controller 3 calculates the drilling depth and drilling speed based on the cumulative number of pulses and the pulse generation time.

[0099] In this embodiment of the invention, the downhole borehole real-time monitoring method described above corresponds to the downhole borehole real-time monitoring device described in Embodiment 1. Its specific implementation process can refer to the process of using the downhole borehole real-time monitoring device to achieve downhole borehole real-time monitoring in Embodiment 1. Where it is repeated, it will not be described again.

[0100] Example 3

[0101] Based on the same inventive concept, embodiments of the present invention also provide a downhole drilling system, referring to... Figures 1-3 As shown, it includes the downhole borehole real-time monitoring device, drive device, drill pipe 51, drill bit 52, steering gear 53 and cylinder 54 described in Embodiment 1;

[0102] The drive shaft 11 is connected to the drive device and the drill rod 51 respectively. The drill rod 51 is connected to the drill bit 52. The drive device can drive the drive shaft 11 to rotate downward.

[0103] The drill rod 51 is a semi-rigid drill rod 51. The guide groove 531 is provided in the diverter 53. The drill rod 51 can pass through the guide groove 531 to change the drilling direction from vertical to horizontal.

[0104] The cylinder 54 is disposed inside the first housing 4 and fixed to the upper part of the end cover 12, and the drive device is disposed inside the cylinder 54;

[0105] The drive unit is connected to the ground controller 3.

[0106] In this embodiment of the invention, since the drive device is connected to the ground controller 3, the ground controller 3 can control the drive device to drive the transmission shaft 11 according to the monitoring results of the downhole borehole real-time monitoring device, so as to improve work efficiency.

[0107] In this embodiment of the invention, reference is made to Figure 2As shown, the steering gear 53 is disposed inside the first housing 4 and located at the bottom of the first housing 4. The side wall of the first housing 4 is provided with a through hole 41 so that the drill rod 51 can extend out of the through hole 41 and continue drilling in the horizontal direction. The drill rod 51 is a semi-rigid drill rod 51, which can switch from a vertical state to a horizontal state along the steering gear 53 while transmitting torque and rotational speed. The end of the drill rod 51 is provided with a thread for connecting the drill bit 52.

[0108] In this embodiment of the invention, reference is made to Figure 2 As shown, the downhole drilling system also includes a coupling 55, which is used to connect the drive shaft 11 and the drill pipe 51. The lower end of the drive shaft 11 is threaded for connection with the coupling 55. The outer wall of the coupling 55 is machined with a square groove 551 for easy installation and disassembly. The lower end of the coupling 55 is threaded for connection with the drill pipe 51.

[0109] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. This disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims. Thus, if these modifications and variations of the invention fall within the scope of the claims of the invention and their equivalents, the invention is also intended to include these modifications and variations.

Claims

1. A downhole drilling system, characterized in that, This includes downhole borehole real-time monitoring devices, drive units, drill pipes, drill bits, steering gears, cylinders, and couplings; The downhole borehole real-time monitoring device includes a monitoring mechanism, a signal processor, a ground controller, and a first housing; The monitoring mechanism includes a drive shaft, an end cap, and at least two samplers; The drive shaft passes through the end cap; the drive shaft is made of non-magnetic metal. The drive shaft can be connected to the drive device and the drill rod respectively, and the drive shaft can rotate and move axially under the drive of the drive device; The at least two samplers are circumferentially arranged on the end cap and distributed sequentially from high to low; The sampler includes an induction coil arranged laterally inside the end cap, and vertically evenly arranged magnetic columns are embedded in the side wall of the drive shaft. The drive shaft can rotate through the end cap to generate an electrical pulse signal from the induction coil. The magnetic columns are made of a strongly magnetic material. An anchoring mechanism is provided on the outer side wall of the first housing for fixing the first housing to the inner wall of the wellbore; the monitoring mechanism is disposed inside the first housing, and the end cap is fixed to the first housing; the signal processor is connected to the sampler and the ground controller respectively. The drive shaft is connected to the drive device and the drill rod respectively. The drill rod is connected to the drill bit. The drive device can drive the drive shaft to rotate downward. The coupling is used to connect the drive shaft and the drill rod. The drill rod is a semi-rigid drill rod, and the guide groove is provided in the directional device. The drill rod can pass through the guide groove to change the drilling direction from vertical to horizontal. The directional device is disposed in the first housing. The side wall of the first housing is provided with a through hole, and the drill rod can extend out of the through hole. The cylinder is disposed inside the first housing and fixed to the upper part of the end cap, and the drive device is disposed inside the cylinder.

2. The downhole drilling system according to claim 1, characterized in that, The at least two samplers are distributed equidistantly in a spiral-ascending manner on the end cap.

3. The downhole drilling system according to claim 1, characterized in that, The number of samplers is three.

4. The downhole drilling system according to claim 1, characterized in that, The sampler also includes a conduit; The end of the conduit is connected to the signal processor; The conduit is used to accommodate the wires between the sampler and the signal processor.

5. The downhole drilling system according to claim 4, characterized in that, The sampler also includes a sealed connector; The sealing joint is used to seal the connection between the conduit and the end cap, so as to seal the induction coil inside the end cap.

6. The downhole drilling system according to claim 1, characterized in that, The signal processor includes a second housing, a signal amplifier disposed within the second housing, and a waveform trimmer; The second housing is disposed above the first housing; The signal amplifier is connected to the sampler and the waveform trimmer, respectively. The waveform trimmer is connected to a ground display.

7. The downhole drilling system according to claim 1, characterized in that, The drive unit is connected to the ground controller.

8. The downhole drilling system according to claim 1, characterized in that, The outer wall of the coupling has a square groove.

9. A method for real-time monitoring of downhole boreholes, using the downhole borehole system according to any one of claims 1-8, characterized in that, include: The drive shaft rotates downwards; The sampler collects electrical pulse signals and transmits the collected electrical pulse signals to the signal processor for signal processing. The processed electrical pulse signal is transmitted to the ground controller, which calculates the drilling depth and drilling speed based on the cumulative number of pulses and the pulse generation time.

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