Geosteering device for kilometer-level horizontal continuous coring

Abstract

The application discloses a geological directional drilling device for kilometer-level horizontal continuous coring, and belongs to the technical field of geological exploration process equipment design and manufacturing. The geological directional drilling device for kilometer-level horizontal continuous coring has the advantages of high adaptability to complex environment, obvious increase of the ability of deflecting and drilling, and the like. The geological directional drilling device comprises a drill bit, a drilling support shell, a continuous coring channel, a composite power driving system and a continuous monitoring control system. The continuous coring channel is arranged in the drilling support shell. The drill bit is arranged on the drilling end of the drilling support shell through the composite power driving system under the cooperation of a groove. An underground control assembly is arranged in the drilling support shell outside the continuous coring channel. A continuous monitoring assembly is connected with a ground control assembly arranged on the ground. The drill bit drills and deflects under the cooperation of the underground control assembly and the ground control assembly. The drilling parameters of the drill bit are monitored through the continuous monitoring assembly.

Description

Technical Field

[0001] This invention relates to a geological directional drilling device, and more particularly to a geological directional drilling device for kilometer-level horizontal continuous coring, belonging to the field of geological exploration process equipment design and manufacturing technology. Background Technology

[0002] Terminology Explanation Continuous coring: refers to a technical method that uses special drilling tools to continuously obtain underground rock core samples without lifting the drill during the drilling process; the wireline coring involved in this invention is a type of continuous coring technology, which achieves continuous coring without lifting the drill by extracting the inner core tube with a steel wire rope.

[0003] Geological steering drilling refers to a drilling technology that uses real-time measurements of formation geological parameters such as natural gamma and resistivity, along with trajectory parameters such as well inclination and azimuth, to dynamically adjust the direction of the drill string, enabling the borehole to precisely traverse the target geological strata. Its core objective is to balance precise trajectory control with real-time acquisition of formation information, thereby achieving geological target-oriented drilling.

[0004] Current geological exploration work is continuously expanding into deeper and more complex environments, with increasing demand for drilling in challenging conditions such as high mountains and deep valleys, plateaus, ecologically fragile areas, and old mining tunnels. These areas place stringent requirements on the size, mobility, environmental friendliness, drilling accuracy, and coring efficiency of drilling equipment. However, existing drilling technologies often struggle to operate efficiently in these complex environments due to issues such as large equipment size and poor adaptability.

[0005] In kilometer-level continuous coring geological steering drilling technology, wireline coring tools are commonly used. However, in existing technologies, there is a serious spatial contradiction between the drill string structure for "measurement, control, and transmission" and the "continuous coring channel." To accommodate measurement, control, and transmission components, the coring channel space is often compressed, affecting the continuity and integrity of coring; or, to ensure the coring channel, the measurement, control, and transmission systems must be simplified, leading to a decrease in drilling accuracy and efficiency. Simultaneously, in terms of power output, a single power source is often used. In complex environments such as restricted operating areas, large drilling rigs are difficult to access, while small drilling rigs lack sufficient power when encountering deep, hard rock, making rapid and efficient drilling difficult. The sensor layout and data transmission methods of the measurement-while-drilling system also have shortcomings, affecting measurement accuracy and data transmission efficiency. The intelligent control system's functions are not comprehensive enough to flexibly coordinate the power output of the downhole power source and accurately control drilling parameters. In horizontal sections where high trajectory control accuracy is required, existing devices struggle to achieve efficient coordination between continuous coring and geological steering.

[0006] Specifically, existing continuous coring exploration drilling technology has the following drawbacks. 1) Space conflict is prominent: In the existing technology, the drilling tool structure for "measurement, control and transmission" competes for space with the "continuous coring channel", which results in either the coring channel being squeezed, affecting the coring effect, or the measurement, control and transmission system being simplified, affecting drilling accuracy and efficiency.

[0007] 2) Poor adaptability to complex environments: Existing equipment is often large in size and long in length. In complex environments such as high mountains and deep valleys, plateaus, ecologically fragile areas, and old mine tunnels, transportation and operation are inconvenient. The corresponding drilling methods have not been effectively adjusted for these environments, making it difficult to meet drilling needs.

[0008] 3) Insufficient directional drilling capability: It cannot meet the drilling requirements of small diameter and high directional drilling. When trajectory adjustment is required, the flexibility and accuracy are insufficient. The strategy and execution of trajectory adjustment in the drilling method are not efficient enough.

[0009] 4) Poor power coordination: The power system is unable to provide continuous and stable strong power in the confined space of deep hard rock operations, and the control of power output in the drilling method is not intelligent enough, which affects drilling efficiency.

[0010] 5) Imperfect drilling methods: The existing methods have not formed a complete geological steering drilling process for continuous horizontal coring at the kilometer level with close coordination of each link, resulting in problems such as discontinuous coring, insufficient utilization of measurement data, and lagging trajectory control. Summary of the Invention

[0011] The technical problem to be solved by the present invention is to provide a geological directional drilling device for continuous horizontal coring at the kilometer level, which has significantly improved adaptability to complex environments and significantly enhanced directional drilling and drilling capabilities.

[0012] The technical solution adopted to solve the above-mentioned technical problems is as follows: a geological steering drilling device for kilometer-level horizontal continuous coring, including a drill bit, a drilling support shell, a continuous coring channel, a composite power drive system, and a continuous monitoring and control system. The continuous monitoring and control system includes at least a continuous monitoring component, an underground control component, and a surface control component. Grooves are provided on the drilling support shell. The continuous coring channel is arranged inside the drilling support shell. The drill bit is arranged on the drilling end of the drilling support shell through the composite power drive system in cooperation with the grooves. The underground control component is arranged sequentially in the drilling support shell outside the continuous coring channel along the length direction of the drilling support shell through grooves at corresponding positions. The continuous monitoring component is connected to the surface control component arranged on the ground through the underground control component. The drill bit drills and creates an azimuth through the composite power drive system in cooperation with the underground control component and the surface control component. The drilling parameters of the drill bit are monitored by the continuous monitoring component. During drilling, the core samples required at each drilling area are sequentially retrieved through the continuous coring channel in cooperation with the coring rope and the continuous monitoring and control system according to a specified frequency.

[0013] Furthermore, the continuous coring channel is composed of the inner tube of the wireline coring tool, and the drilling support shell is composed of the outer tube of the small-diameter wireline coring tool. Grooves are respectively set at corresponding positions on the inner wall of the outer tube of the small-diameter wireline coring tool. The composite power drive system, continuous monitoring component and underground control component are arranged sequentially along the inner wall of the outer tube of the small-diameter wireline coring tool under the cooperation of the grooves at corresponding positions and / or the cavity between the inner tube of the wireline coring tool and the outer tube of the small-diameter wireline coring tool. The drill bit is arranged on the drilling end of the outer tube of the small-diameter wireline coring tool through the composite power drive system.

[0014] The preferred embodiment of the above scheme is that the composite power drive system includes a composite energy supply mechanism and a composite power drive structure. The drill bit is arranged on the drilling end of the drilling support shell through the composite power drive structure. The composite power drive structure, underground control components and surface control components are powered by the composite energy supply mechanism. The drill bit drills and makes directional drilling under the power output of the composite power drive structure.

[0015] Furthermore, the composite power drive structure includes a bent screw motor and an external rotor permanent magnet motor. The bent screw motor is driven by drilling fluid, while the external rotor permanent magnet motor is powered by a composite energy supply mechanism. The drill bit is mounted on the drilling end of the drilling support housing via the bent screw motor. The power output end of the external rotor permanent magnet motor is connected to the drill bit as needed via an underground control component in conjunction with the surface control component and the bent screw motor. The drill bit drills and creates directional drilling under the combined power output of the bent screw motor and the external rotor permanent magnet motor, under the specified conditions. The drilling parameters of the drill bit are monitored and controlled by a continuous monitoring component in conjunction with the bent screw motor, the underground control component, and the surface control component.

[0016] The preferred embodiment of the above scheme is that the composite power drive structure also includes a hollow drive shaft. The bent screw motor forms a hollow structure at least through its rotor with a core channel and a universal joint. The outer rotor permanent magnet motor forms a hollow structure at least through its intermediate fixed shaft with a core channel. The hollow bent screw motor, the hollow outer rotor permanent magnet motor, and the hollow drive shaft are all arranged in the cavity between the inner tube of the wireline coring tool and the outer tube of the small-diameter wireline coring tool. The hollow outer rotor permanent magnet motor is rigidly connected to the drilling support shell through a flange arranged on the intermediate fixed shaft. A drilling fluid channel is reserved on the flange. The rotor of the bent screw motor and the outer rotor of the outer rotor permanent magnet motor are connected in a coupled manner, and the combined driving force is transmitted to the drill bit with the cooperation of the hollow drive shaft.

[0017] Furthermore, the composite energy supply mechanism includes a power supply cable and a small-diameter turbine generator. The power input end of the power supply cable, which is arranged in the cavity between the outer tube of the small-diameter wireline coring tool and the inner tube of the wireline coring tool, is connected to the external power system, and the power output end of the power supply cable is connected to the outer rotor permanent magnet motor. The small-diameter turbine generator generates electricity through drilling fluid. The continuous monitoring component and the underground control component are powered by the small-diameter turbine generator, and the surface control component is powered by the power supply cable.

[0018] The preferred embodiment of the above scheme is that the continuous monitoring component includes at least a measurement-while-drilling (MWD) sub. The MWD sub, arranged near the drill bit with the aid of a groove, is powered by a small-diameter turbine generator. The drilling attitude, drilling position, and formation parameter information at the drilling site are monitored by the MWD sub and transmitted to the underground control component with the aid of the underground control component.

[0019] Furthermore, the measurement-while-drilling sub consists of an array of MEMS sensors arranged in a groove near the drill bit.

[0020] The preferred embodiment of the above scheme is that the underground control component includes data cables and a pre-programmed intelligent control module. The MEMS sensor array, the bent screw motor, and the external rotor permanent magnet motor are respectively connected to the pre-programmed intelligent control module through data cables. The pre-programmed intelligent control module is connected to the ground control component through data cables.

[0021] Furthermore, the ground control component includes a display input assembly and an editable intelligent control module. The data cable of the display input assembly is connected to the editable intelligent control module, and the pre-programmed intelligent control module is connected to the editable intelligent control module via a data cable. The portion of the power supply cable located inside the small-diameter rope cored tube and the data cable are both arranged on the inner wall of the small-diameter rope cored tube through grooves.

[0022] The beneficial effects of this invention are as follows: The technical solution provided in this application is based on existing drill bits. By adding a drilling support shell, a continuous coring channel, a composite power drive system, and a continuous monitoring and control system, the geological steering drilling device of this application is constructed. The continuous monitoring and control system is then configured to include at least a continuous monitoring component, an underground control component, and a surface control component. Grooves are then provided on the drilling support shell, and the continuous coring channel is arranged inside the drilling support shell. The drill bit, through the composite power drive system and in cooperation with the grooves, is positioned on the drilling end of the drilling support shell, enabling the underground control component to... The components are sequentially arranged within the drilling support shell outside the continuous coring channel along the length of the drilling support shell via grooves at corresponding positions. The continuous monitoring component is connected to the surface control component located on the ground via an underground control component. During geological drilling, the drill bit, driven by a composite power drive system in coordination with the underground and surface control components, drills and creates directional drilling. The drilling parameters of the drill bit are monitored by the continuous monitoring component. During drilling, the core samples required at each drilling area are sequentially retrieved through the continuous coring channel at a prescribed frequency, in coordination with the coring rope and the continuous monitoring and control system. Because the geological steering drilling device of this application uses a composite power drive system to provide drilling and directional drilling power to the drill bit, and sets up an underground and surface part of the continuous monitoring and control system (the underground part being arranged via grooves), not only is the adaptability of the geological steering drilling device of this application significantly improved to complex environments, but its directional drilling and drilling capabilities are also significantly enhanced. Attached Figure Description

[0023] Figure 1 This is a simplified structural diagram of the geological directional drilling device for kilometer-level horizontal continuous coring according to the present invention; Figure 2 The present invention relates to a drilling process flow diagram for a geological directional drilling device for kilometer-level horizontal continuous coring.

[0024] The components in the diagram are labeled as follows: 1. Drill bit; 2. Coring wire; 3. Inner tube of the coring tool; 4. Small diameter coring outer tube; 5. Cavity; 6. Bent screw motor; 7. External rotor permanent magnet motor; 8. Hollow drive shaft; 9. Power cable; 10. Small diameter turbine generator; 11. Measurement while drilling sub; 12. Pre-programmed intelligent control module; 13. Display input assembly; 14. Editable intelligent control module. Detailed Implementation

[0025] like Figure 1 , Figure 2The image shows a geological steering drilling device for kilometer-level horizontal continuous coring, which significantly improves adaptability to complex environments and enhances directional drilling and drilling capabilities. The geological steering drilling device includes a drill bit 1, a drilling support shell, a continuous coring channel, a composite power drive system, and a continuous monitoring and control system. The continuous monitoring and control system includes at least a continuous monitoring component, an underground control component, and a surface control component. Grooves are provided on the inner wall of the drilling support shell. The continuous coring channel is arranged inside the drilling support shell. The drill bit 1 is positioned on the drilling end of the drilling support shell via the composite power drive system and the grooves. The underground control component is sequentially arranged along the length of the drilling support shell outside the continuous coring channel on the inner wall of the drilling support shell via grooves at corresponding positions. The continuous monitoring component is connected to the surface control component located on the ground via the underground control component. The drill bit 1 drills and creates an azimuth through the composite power drive system in cooperation with the underground and surface control components. The drilling parameters of the drill bit 1 are monitored by the continuous monitoring component. During drilling, the core samples required at each drilling area are sequentially retrieved through the continuous coring channel in cooperation with the coring rope 2 and the continuous monitoring and control system according to a specified frequency. The technical solution provided in this application is based on existing drill bits. It constructs a geological steering drilling device by adding a drilling support shell, a continuous coring channel, a composite power drive system, and a continuous monitoring and control system. The continuous monitoring and control system is configured to include at least a continuous monitoring component, an underground control component, and a surface control component. Grooves are formed on the drilling support shell, and the continuous coring channel is arranged inside the drilling support shell. The drill bit, driven by the composite power drive system and supported by the grooves, is positioned at the drilling end of the drilling support shell. The underground control component is sequentially arranged along the length of the drilling support shell outside the continuous coring channel via grooves at corresponding positions. The continuous monitoring component is connected to the surface control component located on the ground via the underground control component. During geological drilling, the drill bit, driven by the composite power drive system and supported by the underground and surface control components, drills and creates directional drilling. The drilling parameters of the drill bit are monitored by the continuous monitoring component. During drilling, core samples required at each drilling area are sequentially retrieved through the continuous coring channel at a prescribed frequency, supported by the coring rope and the continuous monitoring and control system. Because the geological steering drilling device of this application uses a composite power drive system to provide drilling and directional drilling power to the drill bit, and sets up a continuous monitoring and control system in underground and above-ground parts, with the underground part arranged by slotting, the geological steering drilling device of this application not only significantly improves its adaptability to complex environments, but also significantly enhances its directional drilling and drilling capabilities.

[0026] Accordingly, in order to adapt to the structural design and power requirements of small drilling rigs to drill ultra-deep holes, and to facilitate the arrangement of various components and achieve rapid and timely sampling during drilling, the continuous coring channel of this application is composed of the inner tube 3 of the wireline coring tool, and the drilling support shell is composed of the outer tube 4 of the small-diameter wireline coring tool. Grooves are respectively provided at corresponding positions on the inner wall of the outer tube of the small-diameter wireline coring tool. The composite power drive system, continuous monitoring component and underground control component are arranged sequentially along the inner wall of the outer tube of the small-diameter wireline coring tool under the cooperation of the grooves at corresponding positions and / or the cavity 5 between the inner tube 3 of the wireline coring tool and the outer tube 4 of the small-diameter wireline coring tool. The drill bit 1 is arranged on the drilling end of the outer tube 4 of the small-diameter wireline coring tool through the composite power drive system. The composite power drive system of this application includes a composite energy supply mechanism and a composite power drive structure. The drill bit 1 is arranged on the drilling end of the drilling support shell through the composite power drive structure. The composite power drive structure, the underground control component, and the surface control component are powered by the composite energy supply mechanism. The drill bit 1 drills and builds directional drills under the power output of the composite power drive structure. The continuous monitoring component of this application includes at least a measurement-while-drilling (MWD) sub 11. The MWD sub 11, arranged near the drill bit 1 with grooves, is powered by a small-diameter turbine generator 10. The drilling attitude, drilling position, and formation parameters at the drilling location of the drill bit 1 are monitored by the MWD sub 11 and transmitted to the underground control component with the cooperation of the underground control component. The underground control component includes data cables and a pre-programmed intelligent control module 12. The MEMS sensor array, the bent screw motor 6, and the external rotor permanent magnet motor 7 are connected to the pre-programmed intelligent control module 12 through data cables. The pre-programmed intelligent control module 12 is connected to the surface control component through data cables. The ground control component includes a display input assembly 13 and an editable intelligent control module 14. The data cable of the display input assembly 13 is connected to the editable intelligent control module 14. The pre-programmed intelligent control module 12 is connected to the editable intelligent control module 14 via a data cable. The portion of the power supply cable 9 located inside the small-diameter rope core tube, along with the data cable, is arranged on the inner wall of the small-diameter rope core tube through grooves.

[0027] Furthermore, in order to provide sufficient power while maximizing adaptability to the actual working conditions of drilling ultra-deep holes and sampling with small drilling rigs, the composite power drive structure of this application includes a bent screw motor 6 and an external rotor permanent magnet motor 7. The bent screw motor 6 is driven by drilling fluid, and the external rotor permanent magnet motor 7 is powered by a composite energy power supply mechanism. The drill bit 1 is arranged on the drilling end of the drilling support shell via the bent screw motor 6. The power output end of the external rotor permanent magnet motor 7 is connected to the drill bit 1 as needed through an underground control component in cooperation with the ground control component and the bent screw motor 6. The drill bit 1 drills and makes directional drilling under the combined power output of the bent screw motor 6 and the external rotor permanent magnet motor 7 under the set conditions. The drilling parameters of the drill bit 1 are monitored and controlled by a continuous monitoring component in cooperation with the bent screw motor 6, the underground control component, and the ground control component. More specifically, the composite power drive structure also includes a hollow drive shaft 8. The bent screw motor 6 forms a hollow structure at least through its rotor with a core channel and a universal joint. The outer rotor permanent magnet motor forms a hollow structure at least through its intermediate fixed shaft with a core channel. The hollow bent screw motor 6, the hollow outer rotor permanent magnet motor 7, and the hollow drive shaft 8 are all arranged in the cavity 5 between the inner tube 3 of the wireline coring tool and the outer tube 4 of the small-diameter wireline coring tool. The hollow outer rotor permanent magnet motor 7 is rigidly connected to the drilling support shell through a flange arranged on the intermediate fixed shaft. A drilling fluid channel is reserved on the flange. The rotor of the bent screw motor 6 and the outer rotor of the outer rotor permanent magnet motor 7 are connected in a coupled manner, and the combined driving force is transmitted to the drill bit with the cooperation of the hollow drive shaft. The composite energy supply mechanism includes a power supply cable 9 and a small-diameter turbine generator 10. The power input end of the power supply cable 9, located in the cavity 5 between the small-diameter wireline coring outer tube 4 and the wireline coring inner tube 3, is connected to an external power system, and the power output end of the power supply cable 9 is connected to an external rotor permanent magnet motor 7. The small-diameter turbine generator 10 generates electricity driven by drilling fluid. The continuous monitoring component and the underground control component are powered by the small-diameter turbine generator 10, and the surface control component is powered by the power supply cable 9. The measurement-while-drilling sub 11 consists of a MEMS sensor array arranged in a groove near the drill bit.

[0028] In summary, the technical solution provided in this application also has the following advantages: 1. This application provides a high-efficiency and high-precision kilometer-level horizontal continuous coring geological steering drilling method and device, which solves the problems of prominent spatial contradictions, poor adaptability to complex environments, insufficient directional drilling capacity, poor power coordination and imperfect drilling methods in the existing technology.

[0029] 2. Three-dimensional spatial layering technology: Through reasonable structural design and dimensional control, the spatial relationship between the drill string structure for "measurement, control, and transmission" and the "continuous coring channel" is effectively coordinated, ensuring both continuous coring and precise measurement, control, and transmission. The inner wall of the wireline coring outer tube is grooved to integrate MEMS sensors, an intelligent control system, data / power transmission cables, and electrical cables. The inner tube retains a complete coring channel, achieving radial partitioning of the "annular functional zone - central coring channel," thus resolving the spatial contradiction between the drill string structure for "measurement, control, and transmission" and the "continuous coring channel."

[0030] 3. Strong adaptability to complex environments: The small-diameter, short-length device design, combined with targeted drilling methods and procedures, makes the device easier to transport and operate in complex environments, meeting the needs of rapid and high-angle drilling in these areas. A small-diameter turbine motor powers the near-bit measurement system and the downhole intelligent control system. The wireline coring tool integrates a near-bit measurement system composed of a MEMS sensor array, a downhole intelligent control system, and a cabled data / power transmission system through grooved grooves on the outer casing. This effectively shortens the overall length and reduces the drill pipe diameter, enabling it to meet the requirements of efficient drilling and high-angle drilling in complex environments such as high mountains, deep valleys, and plateaus.

[0031] 4. High Deflection Capacity: The coordinated operation of the power system and intelligent control system, combined with efficient trajectory adjustment strategies in the drilling method, gives the device a strong deflection capability, enabling precise adjustment of the drilling trajectory to meet high deflection requirements. The power system employs a dual-power coupling system with a bent screw motor as the main power source and an external rotor permanent magnet motor as the auxiliary power source. Combined with the intelligent control system, this solves the problem of insufficient power in complex environments such as restricted operating areas where large drilling rigs have difficulty entering, and where small drilling rigs encounter insufficient power when drilling deep hard rock. This enables rapid and efficient drilling in deep hard rock areas and meets the requirements for high deflection.

[0032] 5. High drilling efficiency: Dual power sources work in tandem, combined with a smart control system for dynamic power output regulation and targeted power strategies in the drilling method, providing ample power in deep hard rock areas and significantly improving drilling efficiency. A complete kilometer-level horizontal continuous coring geological steering drilling method has been developed, including pre-drilling preparation, drilling initiation, continuous coring and measurement while drilling, intelligent control and trajectory adjustment, power coordination and regulation, and data interaction, achieving close coordination among all stages.

[0033] 6. Complete and efficient methods: The complete drilling method enables close coordination between core sampling, measurement, control, and trajectory adjustment, achieving kilometer-level continuous horizontal core sampling and precise geological guidance, thus improving the overall quality and efficiency of drilling.

[0034] Example 1 I. Components of Key Devices The high-efficiency, high-precision kilometer-level horizontal continuous coring geological steering drilling device provided by this invention mainly consists of a wireline coring assembly, an intelligent control system, a power supply system, a power system, a cabled data / power transmission system, a near-bit measurement system, and a drill bit. Each system achieves efficient space utilization through reasonable structural design.

[0035] 1. Rope coring assembly The wireline coring assembly adopts a dual-tube coaxial structure, with strict control over the dimensions of the inner and outer tubes of the wireline coring tool. The inner tube serves as a continuous coring channel, ensuring a sufficient inner diameter to accommodate the core sample; the outer tube, serving as a support and mounting platform for other systems, is designed with a smaller outer diameter to adapt to complex environments. This compact dual-tube coaxial structure, while ensuring a secure coring channel, provides installation space for other systems, effectively alleviating space constraints.

[0036] 2. Intelligent Control System The intelligent control system is housed within the groove of the outer casing, forming a downhole intelligent control system. This system is connected to the near-bit measurement system and the power system via a wired data / power transmission system. The downhole intelligent control system employs a miniaturized design, achieving powerful control functions within a limited space. Based on real-time data from the near-bit measurement system, the downhole intelligent control system intelligently controls drilling parameters, such as drilling speed and drilling pressure, while simultaneously coordinating the power output of the bent screw motor and the external rotor permanent magnet motor. This ensures rapid and efficient drilling in deep hard rock areas while precisely controlling the trajectory to meet high-angle drilling requirements.

[0037] 3. Power supply system A small-diameter turbine generator is used to power the near-bit measurement system and the downhole intelligent control system. The small-diameter turbine generator generates electricity by utilizing the flow of drilling fluid. It has a compact structure and is installed in the annulus between the inner and outer tubes of the wireline coring tool, without occupying the coring channel space. It can continuously and stably power all systems.

[0038] 4. Power System The power system uses a bent screw motor as the primary power source and an external rotor permanent magnet motor as the auxiliary power source. The bent screw motor has strong torque and directional drilling capabilities, meeting the main drilling and trajectory adjustment requirements. The external rotor permanent magnet motor is small in size and has high power density. It is powered by a cable through a wired data / power transmission system. In complex environments such as restricted operating areas where large drilling rigs cannot easily access the site, and where small drilling rigs encounter deep hard rock and lack sufficient power, additional power is required, necessitating its operation in conjunction with the bent screw motor. The rotor of the bent screw motor, the intermediate fixed shaft of the external rotor permanent magnet motor, and the hollow drive shaft all feature a hollow design. Their inner diameter matches the inner tube of the wireline coring assembly, ensuring smooth core passage. Furthermore, the entire power system has a compact structural design, controlled length, and does not increase the overall size of the device.

[0039] 5. Cabled data / power transmission system A wired data / power transmission cable is installed in grooves on the outer tube, embedding both the power cable and the data transmission cable within the grooves without increasing the outer diameter of the device. The data transmission cable enables efficient bidirectional data transmission, transmitting real-time data from the near-bit measurement system to the downhole intelligent control system and the surface intelligent control system. It also transmits commands from the surface intelligent control system to the near-bit measurement system, the downhole intelligent control system, and the power system, efficiently completing downhole and surface data interaction and ensuring timely and accurate information transmission. Simultaneously, the power cable supplies power to the external rotor permanent magnet motor.

[0040] 6. Near-bit measurement system Grooves are etched into the outer casing near the drill bit to house a MEMS sensor array, forming a near-bit measurement-while-drilling (MWD) sub. The grooved design does not affect the structural strength of the outer casing and allows for tight mounting of the sensor array, saving space. The small size and high precision of the MEMS sensor array enable real-time measurement of drill bit attitude, position, formation parameters, and other parameters, providing accurate data for drilling guidance.

[0041] II. Kilometer-level Horizontal Continuous Core Geological Steering Drilling Method This invention constructs a complete kilometer-scale horizontal continuous coring geological steering drilling method, achieving close coordination among coring, measurement, control, and trajectory adjustment stages. For details of the kilometer-scale horizontal continuous coring geological steering drilling process, please refer to [link to documentation]. Figure 2 .

[0042] S1 Preliminary Preparation Phase 1) Based on the geological data of the target drilling area, such as stratigraphic structure and lithological distribution, and combined with the characteristics of the complex environment (such as the terrain limitations of high mountains and deep valleys, and the spatial limitations of old mine roadways), plan the kilometer-level horizontal drilling trajectory and determine the key control points and directional drilling sections.

[0043] 2) Inspect and debug the drilling device of the present invention to ensure that each system is working properly. Based on the planned trajectory and environmental characteristics, preset the initial parameters of the intelligent control system, such as the drilling speed threshold for different formations and the power output ratio.

[0044] 3) Transport the equipment to the drilling site and, based on the complex operating space, use an appropriate installation method to connect the equipment to the drill pipe to ensure that the stability and verticality of the equipment meet the drilling requirements.

[0045] S2 Drilling Start-up Phase 1) Start the power supply system. The drilling fluid drives the small-diameter turbine generator to start working, providing power to the near-bit measurement system, intelligent control system, etc., to ensure that each system enters the working state.

[0046] 2) The power system starts synchronously. In the initial stage, the bent screw motor is the main power source. Drilling begins according to the preset initial drilling parameters, and the external rotor permanent magnet motor is in standby mode.

[0047] S3 Continuous coring and measurement-while-drilling stage 1) During the drilling process, the inner tube of the wireline coring tool of the wireline coring assembly continuously receives rock cores. Since the inner tube of the wireline coring tool is matched with the hollow drive shaft of the power system, the rock core can smoothly enter the inner tube, realizing continuous coring.

[0048] 2) The MEMS sensor array of the near-bit measurement system collects geological parameters and drilling parameters (such as rotational speed, torque, drilling pressure, attitude, etc.) near the drill bit in real time, and transmits the data to the surface intelligent control system and the downhole intelligent control system in real time through the cable data / power transmission system.

[0049] S4 Intelligent Control and Trajectory Adjustment Stage 1) The ground intelligent control system analyzes the received real-time near-drill bit measurement data and compares it with the preset drilling trajectory and parameters. If the drill bit deviates from the preset trajectory, the ground intelligent control system calculates the adjustment amount and sends a command to the power system to adjust the bending angle of the bent screw motor to achieve a preliminary adjustment of the trajectory. If the adjustment amount is large, the external rotor permanent magnet motor is coordinated to assist in the adjustment, thereby improving the accuracy and speed of directional drilling and meeting the requirements of high directional drilling.

[0050] 2) Based on changes in formation parameters, the intelligent control system automatically adjusts drilling parameters, such as appropriately increasing the drilling speed in soft formations and decreasing the drilling speed and increasing the torque in hard rock formations, to ensure the integrity of the core sample and the stability of the drilling.

[0051] S5 Power Coordination and Regulation Phase 1) When the near-bit measurement system detects that it has entered a deep hard rock area and the rock hardness exceeds the preset threshold, the intelligent control system issues a command to start the external rotor permanent magnet motor, which works in conjunction with the bent screw motor to increase power output and ensure drilling efficiency in hard rock areas.

[0052] 2) During the drilling process, the intelligent control system monitors the working status of the power system in real time and dynamically adjusts the power ratio of the bent screw motor and the external rotor permanent magnet motor according to the changes in drilling resistance, so that the power output always matches the formation conditions and avoids power waste or insufficiency.

[0053] S6 Data Interaction and Decision-Making Phase 1) The ground intelligent control system receives near-bit measurement data and drilling status information from downhole in real time through the cable of the wired data / power transmission system. Technicians can remotely monitor the drilling process based on this data.

[0054] 2) If the surface intelligent control system detects an anomaly or needs to adjust the drilling strategy, it can send instructions to the downhole intelligent control system through the cabled data / power transmission system. The downhole intelligent control system will then adjust the drilling parameters or trajectory according to the instructions, thereby achieving two-way data interaction and remote decision-making.

[0055] S7. Drilling Completion Stage 1) When drilling reaches the preset depth or the target area exploration is completed, the ground intelligent control system issues a stop drilling command. The intelligent control system then sequentially shuts down the external rotor permanent magnet motor and the bent screw motor, shuts down the ground equipment, and the drilling fluid circulation ends, thus stopping drilling.

[0056] 2) Inspect and maintain the equipment to prepare for the next stage of drilling or to remove the equipment.

Claims

1. A geological directional drilling device for kilometer-scale horizontal continuous coring, comprising a drill bit (1), characterized in that: The geological steering drilling device also includes a drilling support shell, a continuous coring channel, a composite power drive system, and a continuous monitoring and control system. The continuous monitoring and control system includes at least a continuous monitoring component, an underground control component, and a surface control component. The drilling support shell is provided with grooves. The continuous coring channel is arranged inside the drilling support shell. The drill bit (1) is arranged on the drilling end of the drilling support shell with the cooperation of the composite power drive system and the grooves. The underground control component is arranged sequentially in the drilling support shell outside the continuous coring channel along the length direction of the drilling support shell through the grooves at the corresponding positions. The continuous monitoring component is connected to the surface control component arranged on the ground through the underground control component. The drill bit (1) drills and builds an azimuth through the composite power drive system with the cooperation of the underground control component and the surface control component. The drilling parameters of the drill bit (1) are monitored by the continuous monitoring component. During the drilling process, the core samples to be obtained in each drilling area are sequentially retrieved through the continuous coring channel with the cooperation of the coring rope (2) and the continuous monitoring and control system according to the prescribed frequency.

2. The geological steering drilling device for kilometer-level horizontal continuous coring according to claim 1, characterized in that: The continuous coring channel is composed of the inner tube (3) of the wireline coring tool, and the drilling support shell is composed of the outer tube (4) of the small-diameter wireline coring tool. Grooves are respectively set at corresponding positions on the inner wall of the outer tube. The composite power drive system, the continuous monitoring component and the underground control component are arranged sequentially along the inner wall of the outer tube of the small-diameter wireline coring tool under the cooperation of the grooves at corresponding positions and / or the cavity (5) between the inner tube (3) of the wireline coring tool and the outer tube (4) of the small-diameter wireline coring tool. The drill bit (1) is arranged on the drilling end of the outer tube (4) of the small-diameter wireline coring tool through the composite power drive system.

3. The geological steering drilling device for kilometer-level horizontal continuous coring according to claim 1 or 2, characterized in that: The composite power drive system includes a composite energy power supply mechanism and a composite power drive structure. The drill bit (1) is arranged on the drilling end of the drilling support shell through the composite power drive structure. The composite power drive structure, underground control components and ground control components are powered by the composite energy power supply mechanism. The drill bit (1) drills and skews under the power output of the composite power drive structure.

4. The geological steering drilling device for kilometer-level horizontal continuous coring according to claim 3, characterized in that: The composite power drive structure includes a bent screw motor (6) and an external rotor permanent magnet motor (7). The bent screw motor (6) is driven by drilling fluid, and the external rotor permanent magnet motor (7) is powered by a composite energy power supply mechanism. The drill bit (1) is arranged on the drilling end of the drilling support shell through the bent screw motor (6). The power output end of the external rotor permanent magnet motor (7) is connected to the drill bit (1) as needed through the underground control component in cooperation with the ground control component and the bent screw motor (6). The drill bit (1) drills and skews under the power output of the bent screw motor (6) and the external rotor permanent magnet motor (7) under the set conditions. The drilling parameters of the drill bit (1) are monitored and controlled by the continuous monitoring component in cooperation with the bent screw motor (6), the underground control component and the ground control component.

5. The geological steering drilling device for kilometer-level horizontal continuous coring according to claim 4, characterized in that: The composite power drive structure also includes a hollow drive shaft (8). The bent screw motor (6) forms a hollow structure at least through its rotor with a core channel and a universal joint. The outer rotor permanent magnet motor (7) forms a hollow structure at least through its intermediate fixed shaft with a core channel. The hollow bent screw motor (6), the hollow outer rotor permanent magnet motor (7), and the hollow drive shaft (8) are all arranged in the cavity (5) between the inner tube (3) of the wireline coring tool and the outer tube (4) of the small-diameter wireline coring tool. The hollow outer rotor permanent magnet motor (7) is rigidly connected to the drilling support shell through a flange arranged on the intermediate fixed shaft. A drilling fluid channel is reserved on the flange. The rotor of the bent screw motor (6) and the outer rotor of the outer rotor permanent magnet motor (7) are connected in a coupled manner and the combined driving force is transmitted to the drill bit with the cooperation of the hollow drive shaft.

6. The geological steering drilling device for kilometer-level horizontal continuous coring according to claim 5, characterized in that: The composite energy supply mechanism includes a power supply cable (9) and a small-diameter turbine generator (10). The power input end of the power supply cable (9), which is arranged in the cavity (5) between the small-diameter wireline coring outer tube (4) and the wireline coring tool inner tube (3), is connected to the external power system. The power output end of the power supply cable (9) is connected to the external rotor permanent magnet motor (7). The small-diameter turbine generator (10) generates electricity through drilling fluid. The continuous monitoring component and the underground control component are powered by the small-diameter turbine generator (10). The ground control component is powered by the power supply cable (9).

7. The geological steering drilling device for kilometer-level horizontal continuous coring according to claim 6, characterized in that: The continuous monitoring component includes at least a measurement-while-drilling sub (11). The measurement-while-drilling sub (11) is arranged near the drill bit with the help of a groove and is powered by a small-diameter turbine generator (10). The drilling attitude, drilling position and formation parameter information of the drill bit (1) are monitored by the measurement-while-drilling sub (11) and transmitted to the underground control component with the help of the underground control component.

8. The geological steering drilling device for kilometer-level horizontal continuous coring according to claim 7, characterized in that: The measurement while drilling sub (11) consists of an array of MEMS sensors arranged in a groove near the drill bit.

9. The geological steering drilling device for kilometer-level horizontal continuous coring according to claim 8, characterized in that: The underground control components include data cables and a pre-programmed intelligent control module (12). The MEMS sensor array, the bent screw motor (6), and the external rotor permanent magnet motor (7) are connected to the pre-programmed intelligent control module (12) via data cables. The pre-programmed intelligent control module (12) is connected to the ground control components via data cables.

10. The geological steering drilling device for kilometer-level horizontal continuous coring according to claim 9, characterized in that: The ground control component includes a display input assembly (13) and an editable intelligent control module (14). The data cable of the display input assembly (13) is connected to the editable intelligent control module (14). The pre-programmed intelligent control module (12) is connected to the editable intelligent control module (14) via a data cable. The portion of the power supply cable (9) located inside the small-diameter rope core tube and the data cable are both arranged on the inner wall of the small-diameter rope core tube through grooves.

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