Directional drilling device and method for long distance drilling while injecting downhole

Abstract

This invention provides a long-distance downhole directional drilling device and method for drilling and grouting simultaneously. The directional drilling device includes a water-drive drill bit and a multi-functional integrated drill rod connected to the water-drive drill bit. The multi-functional integrated drill rod includes a cable sleeve, a grouting sleeve, and a drill rod coaxially mounted from the inside out. The cable sleeve is used to install communication cables. A grouting channel is formed between the outer wall of the cable sleeve and the inner wall of the grouting sleeve. A high-pressure water channel is formed between the outer wall of the grouting sleeve and the inner wall of the drill rod. The grouting channel and the high-pressure water channel are respectively connected to the water-drive drill bit. During drilling, power is delivered to the water-drive drill bit through the high-pressure water channel to break the rock formation. At the same time, support grout can be intermittently delivered to the bottom of the hole through the grouting channel to achieve immediate reinforcement of the newly formed hole wall. This synchronous operation mode can eliminate the support gap caused by drilling before support, avoid collapse and diameter reduction problems caused by excessive hole wall exposure time, and significantly improve the safety and hole quality of long-distance directional drilling.

Description

Technical Field

[0001] This invention relates to the field of mine directional drilling technology, and in particular to a long-distance downhole directional drilling device and method for drilling and injection. Background Technology

[0002] Oriented drilling technology in mines is a key technology for ensuring safe and efficient mining operations, and it is widely used in projects such as mineral extraction, geological structure exploration, water exploration and drainage, and regional pressure relief. As mining extends to deeper and more complex geological areas, higher requirements are placed on the depth, accuracy, and reliability of directional drilling.

[0003] However, existing underground directional drilling technology in mines mostly adopts a step-by-step, intermittent operation mode of "drilling first, then installing casing for wall protection." This results in frequent interruptions in the process, long auxiliary times, and difficulty in ensuring uniform quality throughout the entire borehole section. Weak areas are easily formed in the middle and deep sections. Moreover, in soft coal seams, fractured rock strata, and mudstone strata that expand upon cementation, the borehole wall lacks effective immediate support, making it prone to collapse and diameter reduction, leading to frequent stuck drill and buried drill accidents, especially in the middle and later sections of long-distance boreholes. Limited by the non-linear increase in frictional resistance between the drill pipe and the borehole wall with distance and the decrease in borehole trajectory control ability, the effective borehole distance in soft and unstable strata is usually difficult to exceed 300 meters in a single operation, which is insufficient to meet the needs of regional gas control for ultra-long boreholes. Even more seriously, borehole collapse may induce secondary disasters such as local gas accumulation and water inrush; the working environment is complex and poses a significant safety threat when dealing with stuck drill accidents.

[0004] While the concepts of grouting while drilling or mud wall protection exist in the fields of surface horizontal directional drilling or oil drilling, their systems are large and the processes are complex, making them unsuitable for the confined spaces, explosion-proof requirements, and unique geological conditions of mine formations. Therefore, there is an urgent need to develop an integrated grouting while drilling system and method suitable for underground mining, enabling safe and efficient long-distance drilling. Summary of the Invention

[0005] This invention provides a long-distance downhole directional drilling device and method for drilling and injection, which solves the defects of uneven quality throughout the hole and the easy formation of weak quality areas in the middle and deep sections caused by the step-by-step operation mode of "drilling first and then protecting the hole" in the existing technology of mine downhole directional drilling. This invention achieves long-distance safe and efficient drilling.

[0006] This invention provides a long-distance downhole directional drilling device for drilling and injection, comprising a water-driven drill bit and a multi-functional integrated drill rod connected to the water-driven drill bit. The multi-functional integrated drill rod includes a cable sleeve, a grouting sleeve, and a drill rod coaxially mounted from the inside out. The cable sleeve is used to install communication cables. A grouting channel is formed between the outer wall of the cable sleeve and the inner wall of the grouting sleeve. A high-pressure water channel is formed between the outer wall of the grouting sleeve and the inner wall of the drill rod. The grouting channel and the high-pressure water channel are respectively connected to the water-driven drill bit.

[0007] According to the present invention, a directional drilling device for long-distance drilling and injection in wells is provided, wherein a grouting short joint is connected between the multifunctional integrated drill pipe and the water-drive drill bit, and a cable tube is coaxially sleeved inside the grouting short joint, and a flow channel is formed between the outer wall of the cable tube and the inner wall of the grouting short joint.

[0008] One end of the cable conduit is connected to the cable sleeve, and the other end is connected to the water-driven drill bit; one end of the flow channel is connected to the high-pressure water channel, and the other end is connected to the water-driven drill bit; the grouting sleeve extends into the flow channel.

[0009] According to the present invention, a long-distance downhole directional drilling device for drilling and injection is provided, wherein a first annular check valve is provided at one end of the flow channel near the multifunctional integrated drill pipe, and a second annular check valve is provided in the section of the grouting casing extending into the flow channel.

[0010] According to the present invention, a long-distance downhole directional drilling device for drilling and injection is provided, wherein a mechanical pressure driven valve is provided at the end of the pipe section extending into the flow channel of the grouting casing. The mechanical pressure driven valve is normally closed when there is no grouting requirement, and automatically opens when the grouting pressure in the grouting casing reaches a preset threshold.

[0011] According to the present invention, a long-distance downhole directional drilling device for grouting is provided, wherein the mechanical pressure drive valve is a spring-preloaded hydraulic drive valve, including a valve port disposed at the end of the grouting casing and a preloaded spring. One end of the preloaded spring is fixed to the outer wall of the cable conduit, and the other end is connected to the valve port. When there is no grouting requirement, the valve port is pressed against the cable conduit under the preloaded force of the preloaded spring, so that the spring-preloaded hydraulic drive valve is closed. When the grouting pressure in the grouting casing reaches a preset threshold, the valve port opens against the preloaded force of the preloaded spring, so that the spring-preloaded hydraulic drive valve is opened.

[0012] According to the present invention, a long-distance downhole directional drilling device for drilling and injection is provided, wherein the end of the valve port away from the grouting casing is connected to the outer wall of the cable conduit, and the end of the valve port near the grouting casing is adapted to fit against the grouting casing when there is no grouting requirement, and to fit against the inner wall of the grouting short joint when the grouting pressure in the grouting casing reaches a preset threshold.

[0013] The grouting short joint has multiple grouting holes arranged circumferentially on its outer circumferential surface. The valve port is connected to multiple connecting rods circumferentially at one end near the grouting sleeve. The connecting rods pass through the grouting holes, and the ends of the connecting rods extending out of the grouting holes are connected to grouting caps. When the valve port is in contact with the grouting sleeve, the grouting caps cover the grouting holes. When the valve port is in contact with the inner wall of the grouting short joint, the grouting caps open the grouting holes.

[0014] According to the present invention, a long-distance downhole directional drilling device for drilling and injection is provided, wherein a non-magnetic drill rod is connected between the grouting short joint and the water-drive drill bit, and the cable tube extends and passes through the interior of the non-magnetic drill rod to connect with the water-drive drill bit.

[0015] According to the present invention, a long-distance downhole directional drilling device for drilling and injection is provided, wherein the water-driven drill bit is a hydraulic turbine drill bit or a mechanical drill bit driven by a hydraulic motor.

[0016] The present invention also provides a directional drilling method with injection during drilling, comprising the following steps: The downhole long-distance drilling and injection directional drilling device described in any of the above-mentioned methods is used to start directional drilling in a directional well, and the drilling trajectory data is transmitted in real time through the cable casing.

[0017] High-pressure water is injected into the high-pressure water channel at the wellhead to drive the water-driven drill bit to rotate for directional drilling.

[0018] Grout is injected into the grouting channel at the wellhead, and the grout enters the directional borehole through the water-driven drill bit to support the borehole wall.

[0019] According to the present invention, a directional drilling method of injection while drilling is performed, wherein the injection of high-pressure water into the high-pressure water channel at the wellhead and the injection of slurry into the grouting channel at the wellhead are performed alternately to form injection while drilling during the directional drilling process.

[0020] According to the present invention, a directional drilling method for drilling and grouting is provided, wherein the grout injected into the grouting channel is at least one of cement grout, chemical grout or composite support material, which is suitable for rapid setting under underground mining conditions so as to solidify the support hole wall after the borehole is formed.

[0021] The directional drilling device for long-distance drilling and grouting provided by this invention achieves simultaneous drilling and grouting through a design that integrates the structure and separates the channels. During drilling, power is delivered to the water-driven drill bit through a high-pressure water channel to break the rock formation, while support grout is intermittently delivered to the bottom of the hole through the grouting channel to achieve immediate reinforcement of the newly formed hole wall. This synchronous operation mode eliminates the support gap caused by drilling before support in traditional processes, and avoids collapse and diameter reduction problems caused by prolonged exposure of the hole wall. The multi-layer coaxial integrated channel design achieves multi-functional integration without increasing the outer diameter of the drill pipe, adapting to narrow downhole spaces. At the same time, through simultaneous grouting during drilling, the stability of the hole wall can be effectively maintained, reducing the frictional resistance between the drill pipe and the hole wall, thereby extending the effective drilling distance in one go. This breaks through the technical bottleneck of the traditional process where the hole-forming distance in complex formations is less than 300 meters, reduces the interruption of the tripping and tripping process and the segmented hole protection process, and increases the proportion of pure drilling time, thereby improving the overall efficiency and reliability of downhole drilling operations. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the downhole long-distance drilling and injection directional drilling device provided by the present invention.

[0024] Figure 2 yes Figure 1 A schematic diagram of the AA section.

[0025] Figure 3 This is a schematic diagram of the internal structure of an embodiment of the grouting short joint provided by the present invention.

[0026] Figure 4 yes Figure 3 A schematic diagram of the operation of the grouting short joint.

[0027] Figure 5 This is a schematic diagram of the internal structure of another embodiment of the grouting short joint provided by the present invention.

[0028] Figure 6 yes Figure 5 A schematic diagram of the operation of the grouting short joint.

[0029] Reference numerals: 1. Water-driven drill bit; 2. Multi-functional integrated drill rod; 201. Cable sleeve; 202. Grouting sleeve; 203. Drill rod; 3. Grouting channel; 4. High-pressure water channel; 5. Grouting short connector; 501. Grouting hole; 6. Cable conduit; 7. Flow channel; 8. First annular check valve; 9. Second annular check valve; 10. Mechanical pressure driven valve; 101. Valve port; 102. Preload spring; 103. Connecting rod; 104. Grouting cap; 11. Non-magnetic drill rod. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0031] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present 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. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0033] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0035] The following is combined Figures 1 to 6 This invention describes a downhole long-distance directional drilling apparatus and method for drilling and injection.

[0036] One embodiment of the present invention provides a downhole long-distance drilling and injection directional drilling device, combined with Figure 1 and Figure 2 As shown, the system includes a water-driven drill bit 1 and a multi-functional integrated drill rod 2 connected to the water-driven drill bit 1. The multi-functional integrated drill rod 2 includes a cable sleeve 201, a grouting sleeve 202, and a drill rod 203 coaxially mounted from the inside out. The cable sleeve 201 is used to install communication cables. A grouting channel 3 is formed between the outer wall of the cable sleeve 201 and the inner wall of the grouting sleeve 202. A high-pressure water channel 4 is formed between the outer wall of the grouting sleeve 202 and the inner wall of the drill rod 203. The grouting channel 3 and the high-pressure water channel 4 are respectively connected to the water-driven drill bit 1.

[0037] It is understood that the downhole long-distance drilling and injection directional drilling device of this embodiment adopts a multi-layer coaxial multi-functional integrated drill pipe 2. The multi-functional integrated drill pipe 2 includes, from the inside out, a cable sleeve 201, a grouting sleeve 202, and a drill pipe 203. The three are coaxially arranged to form independent and parallel fluid and signal channels. Among them, the inside of the cable sleeve 201 is used to lay communication cables to realize the real-time uploading of drilling trajectory data and the issuance of control commands; the annular space between the cable sleeve 201 and the grouting sleeve 202 forms the grouting channel 3, which is used to transport cement slurry or chemical reinforcement materials; the annular space between the inner wall of the grouting sleeve 202 and the drill pipe 203 forms the high-pressure water channel 4, which is used to provide power to the water-driven drill bit 1. Each channel is connected to the water-driven drill bit 1 at the front end of the drill pipe to realize the integration of drilling, grouting and signal transmission functions.

[0038] Through the design of structural integration and channel separation, this embodiment can achieve "simultaneous drilling and grouting". During drilling, power is delivered to the water-driven drill bit 1 through the high-pressure water channel 4 to break the rock strata. At the same time, support grout can be delivered to the bottom of the hole intermittently through the grouting channel 3 to achieve immediate reinforcement of the newly formed hole wall. This synchronous operation mode can eliminate the support gap caused by the "drill first, support later" process in traditional technology, and avoid the collapse and diameter reduction problems caused by the hole wall being exposed for too long. It is especially suitable for soft coal seams, broken rock strata and water-softened strata.

[0039] It is important to understand that this long-distance downhole directional drilling device with simultaneous grouting significantly improves the safety and borehole quality of long-distance directional drilling. The multi-layered, coaxial, integrated channel design achieves multi-functional integration without increasing the drill pipe's outer diameter, adapting to confined downhole spaces. Simultaneously, through simultaneous grouting during drilling, borehole wall stability is effectively maintained, reducing frictional resistance between the drill pipe and the borehole wall, thereby extending the effective drilling distance in a single operation and overcoming the technical bottleneck of traditional processes achieving borehole distances of less than 300 meters in complex formations. Furthermore, this directional drilling device reduces interruptions in tripping and drilling operations, as well as segmented borehole protection, increasing the proportion of pure drilling time and improving the overall efficiency and reliability of downhole drilling operations.

[0040] In some embodiments of the downhole long-distance drilling and grouting directional drilling device of the present invention, a grouting short connector 5 is connected between the multi-functional integrated drill pipe 2 and the water-drive drill bit 1, see [link]. Figure 3 As shown, a cable conduit 6 is coaxially sleeved inside the grouting short joint 5, and a flow channel 7 is formed between the outer wall of the cable conduit 6 and the inner wall of the grouting short joint 5. One end of the cable conduit 6 is connected to the cable sleeve 201, and the other end is connected to the water-driven drill bit 1; one end of the flow channel 7 is connected to the high-pressure water channel 4, and the other end is connected to the water-driven drill bit 1; the grouting sleeve 202 extends into the flow channel 7.

[0041] It is understood that the grouting short connector 5 in this embodiment serves as a key connection and functional conversion component between the multifunctional integrated drill rod 2 and the water-driven drill bit 1. Internally, a coaxially sleeved cable conduit 6 forms a clearly defined parallel channel. Specifically, the cable conduit 6 runs through both ends of the grouting short connector 5. One end is sealed to the cable sleeve 201 to continue the signal channel, while the other end connects to the electrical interface of the water-driven drill bit 1, ensuring continuous and reliable transmission of measurement and control signals. Simultaneously, the annular space between the outer wall of the cable conduit 6 and the inner wall of the grouting short connector 5 forms a flow channel 7. The upstream end of the flow channel 7 connects to the high-pressure water channel 4, and the downstream end leads to the power inlet of the water-driven drill bit 1, allowing high-pressure water to flow smoothly through the flow channel 7 to drive the water-driven drill bit 1. The grouting sleeve 202 extends forward into the flow channel 7, with its outlet located within the flow channel 7, thus structurally forming a physical convergence of the grouting flow path and the high-pressure water flow path.

[0042] During operation, when grouting support is required, grout is delivered through grouting channel 3 to the end of grouting casing 202 extending into flow channel 7. At this time, high-pressure water flow to high-pressure water channel 4 is stopped, and grout is discharged from the outlet of grouting casing 202 under grouting pressure. It is then transported through flow channel 7 from the flow path of water-driven drill bit 1 to the front end of the borehole (or, in another embodiment described later, enters the borehole annulus through grouting hole 501), achieving immediate support of the newly formed borehole wall. After grouting support is completed, grout flow to grouting casing 202 is stopped, and high-pressure water is again introduced into high-pressure water channel 4 to continue directional drilling. Grouting casing 202 and high-pressure water channel 4 alternately introduce corresponding liquids, alternating between grouting support and directional drilling, achieving a drilling-as-you-go grouting operation mode, eliminating the need for frequent tripping and stopping to interrupt the process.

[0043] It is important to understand that the grouting short connector 5 in this embodiment integrates and reliably connects the three functions of grouting, power, and signaling at the very front of the drill bit, avoiding the structural complexity and reliability risks associated with externally mounted multiple pipelines. The grouting sleeve 202, extending into the flow channel 7, makes the grout outlet very close to the water-drive drill bit 1, enabling "drilling and grouting simultaneously," minimizing the unsupported exposure time of the borehole wall, and effectively suppressing instantaneous deformation of soft and fractured formations.

[0044] In some embodiments of the downhole long-distance drilling and injection directional drilling device of the present invention, see also Figure 3 As shown, a first annular check valve 8 is provided at one end of the flow channel 7 near the multi-functional integrated drill rod 2, and a second annular check valve 9 is provided in the section of the grouting sleeve 202 extending into the flow channel 7.

[0045] It is understood that this embodiment constructs a fluid isolation and anti-pollution control system by setting two-stage annular check valves at key flow path nodes. Specifically, a first annular check valve 8 is installed at the inlet end of the flow channel 7 near the multi-functional integrated drill rod 2. The valve core of the first annular check valve 8 opens under the thrust of the high-pressure water flowing in the forward direction, ensuring that the power medium enters smoothly to drive the water-driven drill bit 1. When grouting operation starts or the pipeline pressure is abnormal, the valve core of the first annular check valve 8 automatically closes under the action of pressure difference, effectively preventing grout or impurities in the borehole from flowing back into the high-pressure water channel. At the same time, a second annular check valve 9 is installed in the section of the grouting casing 202 extending into the flow channel 7. The second annular check valve 9 normally allows grout to flow unidirectionally into the borehole annulus under pressure, but closes immediately when grouting stops or the system pressure decreases, preventing high-pressure water or fluid in the borehole in the flow channel 7 from seeping back into the grouting channel 3.

[0046] During operation, the two-stage check valves work synergistically according to different operational stages. During the directional drilling stage, the first annular check valve 8 opens, and the second annular check valve 9 closes, ensuring that high-pressure water fully drives the water-driven drill bit 1 without interference from the grouting system. During the grouting support stage, the grouting pressure increases, opening the second annular check valve 9, allowing grout to be injected into the flow channel 7. At this time, high-pressure water flow to the high-pressure water channel 4 stops, and the first annular check valve 8 remains closed due to the pressure difference on both sides, effectively preventing grout or impurities in the borehole from flowing back into the high-pressure water channel 4. The grout injected into the flow channel 7 enters the bottom of the borehole through the water-driven drill bit 1 to support the borehole wall. In case of sudden drilling stoppage or pressure fluctuations, both valves can respond quickly and close, forming a double sealing barrier.

[0047] The dual check valve configuration in this embodiment achieves rigid fluid isolation between the drilling power system and the grouting support system, eliminating the risk of cross-contamination and ensuring the purity of high-pressure hydraulic transmission and the stability of the grouting material performance. The dual-valve synergy provides redundant sealing, greatly enhancing the reliability and safety of the system under complex downhole pressure conditions. Even if one valve fails, the other valve can still provide basic isolation. This embodiment allows for rapid and independent switching between drilling and grouting operation modes without the need for complex pipeline cleaning or isolation operations, improving process flexibility and real-time control capabilities in response to formation changes, providing crucial fluid control assurance for long-distance continuous drilling and grouting operations.

[0048] In some embodiments of the downhole long-distance directional drilling device for grouting during drilling of the present invention, a mechanical pressure drive valve 10 is provided at the end of the section of the grouting casing 202 extending into the flow channel 7. The mechanical pressure drive valve 10 is normally closed when there is no grouting requirement, and automatically opens when the grouting pressure in the grouting casing 202 reaches a preset threshold.

[0049] Understandably, this embodiment integrates a mechanical pressure-driven valve 10 at the outlet end of the grouting casing 202 as the final actuator for controlling grout injection. The mechanical pressure-driven valve 10 employs a purely mechanical structure design. When no grouting operation is underway, its valve core remains tightly closed under the action of an internal pre-tightening mechanism, completely isolating the grouting channel 3 from the forward flow channel 7 and the borehole annulus. When the wellhead grouting system is activated, the grouting pressure is transmitted to the valve along the grouting channel 3. The hydraulic thrust acting on the valve core continuously increases. Once this thrust overcomes the preset closing force of the pre-tightening mechanism, the valve core is pushed and displaced, automatically opening the valve and forming a passage for grout to flow out.

[0050] The operation of the mechanical pressure drive valve 10 is entirely controlled by the hydraulic signals of the grouting system itself, achieving automatic matching between grouting start / stop and downhole conditions. During drilling, if the borehole wall is stable and no support is required, the grouting system maintains low pressure or stops pumping, and the mechanical pressure drive valve 10 remains closed to prevent high-pressure water or rock cuttings from backflowing and contaminating the grouting channel 3. When encountering fractured or soft strata requiring immediate support, the ground operator or automatic control system increases the grouting pump pressure. Once the pressure is transmitted to the valve core of the mechanical pressure drive valve 10 and reaches the opening threshold, the valve quickly responds and opens, and the grout is immediately injected into the borehole annulus to reinforce the borehole wall. After support is completed, the grouting pressure is reduced, and the mechanical pressure drive valve 10 automatically resets and closes under the action of the pre-tightening mechanism, stopping grouting.

[0051] It is important to understand that the purely mechanical drive method in this embodiment requires no electricity or a complex electro-hydraulic control system. Its simple structure and robust durability make it particularly suitable for the harsh environments of underground coal mines, characterized by humidity, high vibration, and stringent explosion-proof requirements, resulting in high reliability. The mechanical pressure-driven valve 10 automatically opens and closes based on a pressure threshold, achieving "on-demand supply" for grouting operations. This avoids unnecessary grout consumption and pipeline blockage risks, while ensuring timely and effective protection in the required borehole sections, improving material utilization and support targeting. As the terminal control point of the grouting process, the mechanical pressure-driven valve 10, together with the check valve of the aforementioned embodiment, constitutes a complete passive fluid control logic. This gives the entire drilling and grouting system stronger adaptability and operational robustness, facilitating intelligent and unmanned drilling operations.

[0052] In some specific examples, the mechanical pressure driven valve 10 is a spring-preloaded hydraulic driven valve, combined with Figure 3 and Figure 4As shown, the mechanical pressure driven valve 10 includes a valve port 101 disposed at the end of the grouting sleeve 202 and a pre-tightening spring 102. One end of the pre-tightening spring 102 is fixed to the outer wall of the cable pipe 6, and the other end is connected to the valve port 101. When there is no grouting requirement, the valve port 101 is attached to the cable pipe 6 under the pre-tightening force of the pre-tightening spring 102, so that the spring pre-tightening hydraulic driven valve is closed. When the grouting pressure in the grouting sleeve 202 reaches a preset threshold, the valve port 101 opens against the pre-tightening force of the pre-tightening spring 102, so that the spring pre-tightening hydraulic driven valve is opened.

[0053] Understandably, in this example, the mechanical pressure-driven valve 10 employs a reliable spring-preloaded hydraulic drive structure. Its core components include an annular valve port (port 101) located at the end of the grouting casing 202, and a preload spring 102 providing a restoring force. One end of the preload spring 102 is fixed to the outer wall of the cable conduit 6, which extends coaxially with the drill bit, while the other end is connected to and acts on the annular valve port. See [reference needed] for the initial state or non-grouting conditions. Figure 3 As shown, under the continuous action of the spring preload, the sealing surface of valve port 101 is pressed tightly against the smooth outer wall of cable conduit 6, forming a mechanical seal, thereby completely sealing the grouting channel. During directional drilling, the ground control system commands the high-pressure water pump to start, injecting high-pressure water into the high-pressure water channel 4 of the drill rod. The high-pressure water reaches the water-driven drill bit 1 through the flow channel 7, driving the water-driven drill bit 1 to perform pure drilling operations. During this period, the grouting system remains in standby or low-pressure circulation state, and the mechanical pressure drive valve 10 in the grouting channel 3 is closed because the pressure has not reached the threshold.

[0054] When grouting is required, see [link / reference]. Figure 4 As shown, the injection of high-pressure water into the high-pressure water channel 4 is stopped, and the ground pump station increases the grouting pressure. The high-pressure grout enters the grouting sleeve 202 and acts on the inner pressure-bearing surface of the valve port 101. As the pressure continues to rise, the hydraulic thrust generated by the grout on the valve port 101 gradually increases. When this thrust exceeds the pre-tightening force threshold set by the pre-tightening spring 102, the valve port 101 overcomes the spring pressure and begins to move axially, disengaging from the cable pipe 6, thereby opening an annular spray gap. The grout is then sprayed at high speed into the flow channel 7 through this gap and enters the borehole annulus by the water-driven drill bit 1, achieving immediate coverage and reinforcement of the borehole wall. When the grouting operation ends, the pump pressure decreases, the hydraulic thrust weakens, the pre-tightening spring 102 drives the valve port 101 to reset, re-tightening the outer wall of the cable pipe 6, and the valve quickly closes, cutting off the grout flow path.

[0055] This spring-preloaded valve, as exemplified here, operates entirely by a dynamic balance between the system's own hydraulic pressure and a pre-set spring force, achieving autonomous control without external signals or energy input. It offers rapid response and strong anti-interference capabilities. The annular sealing contact surface formed by the valve port 101 and the outer wall of the cable conduit 6 is small, with concentrated clamping force, resulting in excellent sealing performance and effectively preventing leakage of fine slurry particles or backflow of high-pressure water. Furthermore, by replacing the preloaded springs 102 with different stiffness coefficients, the valve's opening pressure threshold can be flexibly adjusted to adapt to different slurry viscosities or formation support pressure requirements, enhancing the process's adaptability and adjustability. The spring-preloaded valve structure in this example, with its simplicity, reliability, and high environmental adaptability, ensures stable and precise operation of the drilling-as-you-go system under complex downhole conditions.

[0056] In other embodiments of the downhole long-distance drilling and injection directional drilling device of the present invention, combined with Figure 5 and Figure 6 As shown, the end of valve port 101 away from grouting sleeve 202 is connected to the outer wall of cable conduit 6. The end of valve port 101 near grouting sleeve 202 is adapted to fit against grouting sleeve 202 when there is no grouting requirement, and fit against inner wall of grouting short joint 5 when the grouting pressure in grouting sleeve 202 reaches a preset threshold. Multiple grouting holes 501 are circumferentially arranged on the outer circumferential surface of grouting short joint 5. Multiple connecting rods 103 are circumferentially connected to the end of valve port 101 near grouting sleeve 202. The connecting rods 103 pass through the grouting holes 501. The end of the connecting rod 103 extending out of the grouting hole 501 is connected to a grouting cap 104. When valve port 101 fits against grouting sleeve 202, grouting cap 104 covers grouting hole 501. When valve port 101 fits against inner wall of grouting short joint 5, grouting cap 104 opens grouting hole 501.

[0057] It is understood that in the structure of the grouting short joint 5 in this embodiment, grouting is performed through the grouting sleeve 202. The grout no longer enters the borehole annulus through the water-driven drill bit 1, but instead enters the borehole annulus through the grouting hole 501 on the grouting short joint 5. Specifically, see... Figure 5 As shown, during directional drilling, the ground control system commands the high-pressure water pump to start, injecting high-pressure water into the high-pressure water channel 4 of the drill rod. The high-pressure water reaches the water-driven drill bit 1 through the flow channel 7, driving the water-driven drill bit 1 to perform pure drilling operations. During this period, the grouting system remains in standby or low-pressure circulation state. The mechanical pressure drive valve 10 in the grouting channel 3 is closed because the pressure has not reached the threshold. The connecting rod 103 circumferentially connected to the valve port 101 pulls the grouting cap 104 to cover the grouting hole 501. When grouting is required, see [link to relevant documentation]. Figure 6As shown, the injection of high-pressure water into the high-pressure water channel 4 is stopped, and the ground pump station increases the grouting pressure. The high-pressure grout enters the grouting sleeve 202 (grouting channel 3) and acts on the inner pressure bearing surface of the valve port 101. As the pressure continues to rise, the hydraulic thrust generated by the grout on the valve port 101 gradually increases. When this thrust exceeds the pre-tightening force threshold set by the pre-tightening spring 102, the valve port 101 overcomes the spring pressure and begins to open axially. As the hydraulic thrust continues to increase, the opened valve port 101 adheres to the inner wall of the grouting short joint 5. At this time, the connecting rod 103 circumferentially connected to the valve port 101 pushes the grouting cap 104 to extend radially outward along the grouting short joint 5. The grouting cap 104 disengages from the grouting hole 501, causing the grouting hole 501 to open. The grout transported by the grouting channel 3 is blocked by the valve port 101 and directly enters the borehole annulus through the grouting hole 501, achieving immediate coverage and reinforcement of the borehole wall. When the grouting operation ends, the pump pressure decreases, the hydraulic thrust weakens, and the pre-tension spring 102 drives the valve port 101 to reset and re-fit against the grouting casing 202. The valve then closes quickly, cutting off the grout flow path. The high-pressure water pump is restarted to inject high-pressure water into the high-pressure water channel 4 of the drill pipe for directional drilling.

[0058] In some embodiments of the downhole long-distance drilling and injection directional drilling device of the present invention, see again Figure 1 As shown, a non-magnetic drill rod 11 is connected between the grouting short connector 5 and the water-driven drill bit 1. The cable conduit 6 extends and passes through the inside of the non-magnetic drill rod 11 to connect with the water-driven drill bit 1.

[0059] It is understood that in the long-distance downhole drilling and directional drilling device of this embodiment, a non-magnetic drill rod 11 is added between the grouting short joint 5 and the water drive drill bit 1. The hollow internal structure of the non-magnetic drill rod 11 is precisely aligned and connected with the cable tube 6 in the grouting short joint 5, so that the cable tube 6 can extend through the entire non-magnetic drill rod 11 without damage, directly reaching and connecting to the electrical interface inside the water drive drill bit 1. This ensures that the communication cable led out from the cable sleeve 201 of the multi-functional integrated drill rod 2 can pass through the cable tube 6 in the grouting short joint 5, then through the protective channel of the non-magnetic drill rod 11, and finally achieve electrical communication with the measurement, orientation or control module inside the water drive drill bit 1.

[0060] During drilling operations, the non-magnetic drill rod 11, installed at the rear of the water-driven drill bit 1, is made of non-magnetic alloy materials (such as Monel alloy, non-magnetic stainless steel, etc.). It can provide a local non-magnetic interference environment for the drilling measurement instruments (such as gyroscopes, fluxgate magnetometers, or gravity accelerometers) near the drill bit. This allows the measuring elements to accurately sense the Earth's magnetic field or gravity field signals, thereby accurately calculating key trajectory parameters such as the drill bit's real-time azimuth angle, tilt angle, and tool face angle. These data are continuously uploaded to the ground control system through well-protected internal cables, providing a reliable basis for orientation and navigation.

[0061] By incorporating the non-magnetic drill rod 11, the problem of interference from the magnetism of traditional drill rods on the measurement-while-drilling system is solved, greatly improving the trajectory measurement and control accuracy of long-distance, deep borehole drilling. The critical signal cable is completely embedded in the center of the drill string, forming a continuous, sealed, and pressure-resistant signal transmission channel composed of the cable sleeve 201, cable conduit 6, and the inner cavity of the non-magnetic drill rod 11. This effectively avoids damage to the fragile cable from external high-pressure fluids in the annulus, rock cuttings erosion, or mechanical collisions, ensuring the continuity and reliability of data transmission.

[0062] In some embodiments of the downhole long-distance drilling and injection directional drilling device of the present invention, the water-driven drill bit 1 is a hydraulic turbine drill bit or a mechanical drill bit driven by a hydraulic motor. It is understood that the water-driven drill bit 1 in this embodiment, as the execution terminal for directly breaking rock formations and forming boreholes, has a key adaptive design in terms of its power source and structural form. The water-driven drill bit 1 can specifically adopt two efficient power schemes: one is a hydraulic turbine drill bit, which integrates a turbine rotor. When high-pressure water flows from the high-pressure water channel 4 of the drill pipe through a specific flow channel inside the drill bit, it drives the turbine to rotate at high speed, thereby driving the coaxial drill bit cutting teeth or grinding structure to break the rock; the other is a mechanical drill bit driven by a hydraulic motor. In this scheme, high-pressure water first drives an independent, efficient downhole hydraulic motor (such as a screw motor) to generate rotational mechanical energy, and then transmits the torque to the conventional PDC drill bit or roller cone drill bit at the front end for drilling through a transmission shaft.

[0063] In actual operation, the water-driven drill bit 1 is driven by the high-pressure water channel 4 integrated in the device of this invention, which transmits the power medium. A high-pressure water pump unit from the ground continuously pumps clean water or drilling fluid through the drill pipe annulus to the water-driven drill bit 1. For a hydraulic turbine drill bit, the energy of the high-pressure fluid is directly converted into rotational kinetic energy inside the drill bit; for a hydraulic motor drive system, the fluid energy is first converted into shaft rotation in the motor, and then drives the drill bit. Regardless of the method used, the core power required for drilling originates from the same high-pressure water channel 4, ensuring a high degree of structural and control uniformity between the power transmission and drilling systems. Simultaneously, the fluid that has completed its work through the drill bit (i.e., exhaust water) returns to the borehole annulus, serving multiple purposes such as carrying rock cuttings and cooling the drill bit.

[0064] In another aspect, the present invention provides a directional drilling method with drilling and injection. In some embodiments of this method, the method includes the following steps: A long-distance downhole directional drilling device with drilling and injection, as described in any of the above embodiments or examples, is lowered into a directional well to begin directional drilling, and borehole trajectory data is transmitted in real time through the cable casing 201. High-pressure water is injected into the high-pressure water channel 4 at the wellhead to drive the water-driven drill bit 1 to rotate for directional drilling. Grout is injected into the grouting channel 3 at the wellhead, and the grout enters the directional borehole through the water-driven drill bit 1 to support the borehole wall.

[0065] It is understood that the directional drilling method with drilling and injection in this embodiment is a construction process that achieves "synchronous excavation and support" based on the long-distance drilling and injection directional drilling device in any of the foregoing embodiments or examples. The directional drilling method with drilling and injection integrates the three major functions of drilling rock breaking, borehole wall support, and trajectory measurement in time and space, aiming to overcome industry challenges such as borehole wall instability, short borehole distance, and low construction efficiency in long-distance underground drilling in coal mines.

[0066] Specifically, the first step is to assemble and initialize the drill string assembly. The operators lower the assembled downhole long-distance directional drilling rig into the pre-set directional wellhead. The core of this rig is the multi-functional integrated drill pipe 2, which coaxially integrates the cable casing 201, grouting casing 202, and drill pipe 203, forming independent signal channels, grouting channels 3, and high-pressure water channels 4. At the front of the rig is the water-driven drill bit 1 (which can be a hydraulic turbine drill bit or a hydraulic motor-driven drill bit), followed by grouting short connectors 5, non-magnetic drill pipes 11, and other components. During drilling, a real-time data link is established between the ground control system and the measuring instruments at the drill bit end via the communication cable inside the cable casing 201, allowing the receiving and monitoring of initial borehole attitude data.

[0067] Next, the high-pressure water power system is activated for directional drilling. After the drill string reaches the predetermined position, the high-pressure water pump is started at the wellhead to continuously inject high-pressure water into the high-pressure water channel 4 of the drill pipe. The high-pressure water is transported through the annular channel (high-pressure water channel 4) inside the drill pipe, flows through the flow channel 7 in the grouting short joint 5, and finally reaches the water-drive drill bit 1. The high-pressure water drives the power mechanism (turbine or hydraulic motor) inside the water-drive drill bit 1 to rotate at high speed, causing the drill bit cutting teeth to break the rock strata in front, thereby forming a borehole. At the same time, the measurement while drilling system located in the non-magnetic drill pipe section 11 at the rear of the water-drive drill bit 1 accurately measures the azimuth, inclination, and other parameters of the drill bit in a non-magnetic environment. The data is uploaded to the surface in real time through the cable casing. Based on the formation design and real-time trajectory data, the operator precisely controls the borehole trajectory by adjusting drilling parameters or using the drill string's guiding mechanism to achieve directional drilling.

[0068] A key step is implementing simultaneous grouting support during drilling. During intervals in directional drilling or according to a preset strategy, the grouting procedure is initiated. A surface grouting pump injects a specific ratio of grout (such as cement grout, chemical grout, etc.) into the grouting channel 3 of the drill pipe. The grout flows downwards along the grouting casing 202, passing through the grouting casing section extending into the flow channel 7. When the grouting pressure reaches a preset threshold, the mechanical pressure-driven valve 10 (such as a spring-loaded hydraulic valve) located at the end of the grouting casing 202 automatically opens. The grout then sprays out from the valve port 101, enters the flow channel 7 within the grouting short joint 5, and flows out through the drive drill bit 1, entering the annulus between the borehole and the drill pipe. The grout moves forward (towards the borehole opening) in the annulus and rapidly fills and covers the newly formed exposed borehole wall.

[0069] The grout rapidly diffuses within the borehole annulus, instantly reinforcing, sealing, and supporting the borehole wall that has just been broken by the drill bit and has not yet had time to deform or fail. This process is strictly integrated with and alternates with the drilling operation, eliminating the support gap caused by the frequent raising and lowering of the tubing string in the traditional "drilling first, then supporting" process. By adjusting the grouting pressure, flow rate, and grout properties, the immediate support needs of different strata (such as soft coal seams, fractured rock strata, and cemented rock strata) can be met. The coordinated operation of drilling and grouting continues until the designed borehole depth is reached. Throughout the process, structures such as the first annular check valve 8 and the second annular check valve 9 effectively prevent backflow and contamination of fluid between channels, ensuring the independent and stable operation of each system.

[0070] In some embodiments of the directional drilling method of the present invention, high-pressure water is injected into the high-pressure water channel 4 at the wellhead and slurry is injected into the grouting channel 3 at the wellhead alternately to form the directional drilling process of injection during drilling.

[0071] It is understood that in this embodiment, the two core operations of drilling and grouting adopt an alternating cyclical strategy. The implementation process is as follows: First, the ground control system commands the high-pressure water pump to inject high-pressure water into the high-pressure water channel 4 of the drill rod, driving the water-driven drill bit 1 to perform pure drilling operations. During this period, the grouting system remains in standby or low-pressure circulation state, and the mechanical pressure drive valve 10 in the grouting channel 3 is in the closed state because the pressure has not reached the threshold.

[0072] When the drill bit advances a predetermined distance (e.g., 3-5 meters), or when the measurement-while-drilling system / wellhead backfilling system detects that it has entered a fractured, soft, or other section requiring reinforced support, drilling is paused or switched to a low-speed maintenance state, and the process is switched to the grouting support stage. The high-pressure water pump reduces its discharge rate or temporarily stops, while the grouting pump starts, injecting grout into the grouting channel 3. As the grouting pressure increases and reaches the preset opening threshold, the mechanical pressure-driven valve 10 at the end of the grouting casing 202 automatically opens, and the grout is injected into the borehole annulus, precisely and fully reinforcing the newly formed section of the borehole wall. Grouting continues for a period of time to ensure that the grout effectively fills and initially solidifies.

[0073] After the support section is completed, the grouting pump stops or reduces pressure, and the mechanical pressure drive valve 10 automatically closes. Then, the high-pressure water pump restarts at full capacity, and the water-driven drill bit 1 resumes high-speed rotation, continuing to drill forward to the next cycle. In this way, the two phases of pure drilling and pure grouting alternate in a cycle, forming a periodic operation process with a controllable rhythm. This achieves a concentrated allocation of resources and energy. In the pure drilling phase, all hydraulic energy is concentrated on driving the drill bit to break the rock, resulting in a higher mechanical drilling rate. In the pure grouting phase, all pumping capacity is concentrated on injecting grout, ensuring higher grouting pressure and fullness.

[0074] Furthermore, in some specific examples, by analyzing drilling data, it is possible to intelligently determine when to start the grouting cycle, thereby achieving differentiated support for different formation characteristics, avoiding grout waste, and optimizing material costs while ensuring borehole stability.

[0075] In some embodiments of the directional drilling method of the present invention, the grout injected into the grouting channel 3 is at least one of cement grout, chemical grout or composite support material, which is suitable for rapid setting under mine conditions so as to solidify the support hole wall after the borehole is formed.

[0076] It is understood that in the drilling-as-you-go directional drilling method of the present invention, the support material (grout) injected into the grouting channel 3 is not a single material, but a material system adapted to different downhole geological and engineering needs. It mainly includes: traditional and economical cement-based grout (which can be modified by adding quick-setting agents, expanding agents, etc.); chemical grouts with stronger permeability and adhesion (such as polyurethane, acrylate, water glass, etc.); and composite support materials with better comprehensive performance (such as cement-water glass two-liquid grout, polymer-modified cement grout, or composite materials with added fiber toughening). The common core feature of these materials is that they are suitable for controllable rapid setting under specific temperature, humidity and pressure conditions in the mine.

[0077] During implementation, the selection and proportioning of the grout are dynamically optimized based on formation characteristics, support requirements, and technological stages. For example, when encountering generally fractured rock formations, modified cement grout, which has lower cost and faster strength development, can be used; when encountering formations with high water permeability or well-developed microfractures, permeation-curing chemical grouts are preferred to achieve both water plugging and consolidation; and in critical sections requiring high toughness and impact resistance, fiber composite grouts can be injected. The grout is prepared in an automated mixing and delivery system at the wellhead and pumped into grouting channel 3 via a grouting pump. After the grout is delivered to the bottom of the borehole and injected into the annulus, it can transform from a flowing state to a solidified body with a certain early strength within minutes to tens of minutes, utilizing the material's own rapid setting characteristics.

[0078] This embodiment demonstrates a refined design and application of support materials, ensuring timely and effective support. The rapid-setting properties of the grout allow it to generate initial strength within a very short time after borehole formation, quickly suppressing instantaneous deformation and spalling of the borehole wall, achieving reinforcement as drilling progresses, and solving the problem of support lag caused by the slow setting of traditional grouting materials. By employing the most suitable grout for different lithologies, stress states, and engineering purposes (such as gas sealing, aquifer isolation, and reinforcement of fractured roofs), both support quality and economic benefits can be achieved. By switching or adjusting the grouting material along the borehole depth direction based on real-time geological information, reliable reinforcement matching the geological conditions of each section from the borehole opening to the bottom can be ensured, overcoming the difficulty of traditional single grouts being unable to adapt to complex strata throughout the borehole, thus guaranteeing the long-term stability and service performance of ultra-long boreholes.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A long-distance downhole directional drilling device for drilling and injection, characterized in that, The device includes a water-driven drill bit (1) and a multi-functional integrated drill rod (2) connected to the water-driven drill bit (1). The multi-functional integrated drill rod (2) includes a cable sleeve (201), a grouting sleeve (202), and a drill rod (203) coaxially mounted from the inside to the outside. The cable sleeve (201) is used to install communication cables. A grouting channel (3) is formed between the outer wall of the cable sleeve (201) and the inner wall of the grouting sleeve (202). A high-pressure water channel (4) is formed between the outer wall of the grouting sleeve (202) and the inner wall of the drill rod (203). The grouting channel (3) and the high-pressure water channel (4) are respectively connected to the water-driven drill bit (1).

2. The downhole long-distance drilling and injection directional drilling device according to claim 1, characterized in that, The multi-functional integrated drill rod (2) is connected to the water-driven drill bit (1) by a grouting short joint (5), and a cable tube (6) is coaxially sleeved inside the grouting short joint (5). A flow channel (7) is formed between the outer wall of the cable tube (6) and the inner wall of the grouting short joint (5). One end of the cable conduit (6) is connected to the cable sleeve (201), and the other end is connected to the water-driven drill bit (1); one end of the flow channel (7) is connected to the high-pressure water channel (4), and the other end is connected to the water-driven drill bit (1); the grouting sleeve (202) extends into the flow channel (7).

3. The downhole long-distance drilling and injection directional drilling device according to claim 2, characterized in that, A first annular check valve (8) is provided at one end of the flow channel (7) near the multi-functional integrated drill rod (2), and a second annular check valve (9) is provided in the pipe section of the grouting sleeve (202) extending into the flow channel (7).

4. The downhole long-distance drilling and injection directional drilling device according to claim 2, characterized in that, A mechanical pressure drive valve (10) is provided at the end of the pipe section extending from the grouting sleeve (202) into the flow channel (7). The mechanical pressure drive valve (10) is normally closed when there is no grouting requirement, and automatically opens when the grouting pressure in the grouting sleeve (202) reaches a preset threshold.

5. The downhole long-distance drilling and injection directional drilling device according to claim 4, characterized in that, The mechanical pressure driven valve (10) is a spring-preloaded hydraulic driven valve, including a valve port (101) and a preloaded spring (102) disposed at the end of the grouting sleeve (202). One end of the preloaded spring (102) is fixed to the outer wall of the cable pipe (6), and the other end is connected to the valve port (101). When there is no grouting requirement, the valve port (101) is attached to the cable pipe (6) under the preloaded force of the preloaded spring (102) so that the spring-preloaded hydraulic driven valve is closed. When the grouting pressure in the grouting sleeve (202) reaches a preset threshold, the valve port (101) opens against the preloaded force of the preloaded spring (102) so that the spring-preloaded hydraulic driven valve is opened.

6. The downhole long-distance drilling and injection directional drilling device according to claim 5, characterized in that, The valve port (101) is connected to the outer wall of the cable pipe (6) at one end away from the grouting sleeve (202). The valve port (101) is adapted to fit against the grouting sleeve (202) when there is no grouting requirement, and to fit against the inner wall of the grouting short joint (5) when the grouting pressure in the grouting sleeve (202) reaches a preset threshold. The grouting short joint (5) has a plurality of grouting holes (501) arranged circumferentially on its outer circumferential surface. The valve port (101) is connected to a plurality of connecting rods (103) circumferentially at one end near the grouting sleeve (202). The connecting rods (103) pass through the grouting holes (501). The end of the connecting rod (103) extending out of the grouting hole (501) is connected to a grouting cap (104). When the valve port (101) is in contact with the grouting sleeve (202), the grouting cap (104) covers the grouting hole (501). When the valve port (101) is in contact with the inner wall of the grouting short joint (5), the grouting cap (104) opens the grouting hole (501).

7. The downhole long-distance drilling and injection directional drilling device according to any one of claims 2 to 6, characterized in that, A non-magnetic drill rod (11) is connected between the grouting short connector (5) and the water-driven drill bit (1). The cable tube (6) extends and passes through the inside of the non-magnetic drill rod (11) to connect with the water-driven drill bit (1).

8. The downhole long-distance directional drilling apparatus for drilling and injection as described in any one of claims 1 to 6, characterized in that, The water-driven drill bit (1) is a hydraulic turbine drill bit or a mechanical drill bit driven by a hydraulic motor.

9. A directional drilling method with injection during drilling, characterized in that, include: The downhole long-distance drilling and injection directional drilling device described in any one of claims 1 to 8 is used to start directional drilling in a directional well, and the drilling trajectory data is transmitted in real time through the cable casing (201). High-pressure water is injected into the high-pressure water channel (4) at the wellhead to drive the water-driven drill bit (1) to rotate for directional drilling; Grout is injected into the grouting channel (3) at the wellhead, and the grout enters the directional borehole through the water-driven drill bit (1) for borehole wall support.

10. The directional drilling method with injection while drilling according to claim 9, characterized in that, The injection of high-pressure water into the high-pressure water channel (4) at the wellhead and the injection of grout into the grouting channel (3) at the wellhead are carried out alternately to form a drilling and injection process during directional drilling. The grout injected into the grouting channel (3) is at least one of cement grout, chemical grout or composite support material, which is suitable for rapid setting under underground mine conditions so as to solidify the support hole wall after the borehole is formed.

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