Real-time gas drainage device for kilometer directional drilling

Abstract

The present application relates to the technical field of coal mine safety production, and provide a kind of kilometer directional drilling real-time gas extraction device, kilometer directional drilling real-time gas extraction device includes main pipe section, first extraction pipeline, multi-way valve, primary gas-water separator and second extraction pipeline, one end of main pipe section is used to butt joint borehole, drill rod is adapted to pass through main pipe section from the other end of main pipe section and carry out sustained drilling;First extraction pipeline is communicated with main pipe section;Multi-way valve is located in the end of main pipe section away from borehole, and is communicated with main pipe section;Primary gas-water separator is communicated with multi-way valve by first pipeline;Second extraction pipeline is communicated with multi-way valve.The present application is butt joint borehole by setting main pipe section to allow drill rod sustained drilling, simultaneously using multi-way valve to connect first extraction pipeline, second extraction pipeline and primary gas-water separator, realize real-time gas extraction in the process of drilling, can realize continuous real-time gas extraction in the whole process of drilling, effectively prevent gas overrun.

Description

Technical Field

[0001] This invention relates to the field of coal mine safety production technology, and in particular to a real-time gas drainage device for kilometer-deep directional drilling. Background Technology

[0002] Mine gas, a major hidden danger in coal mine safety, is highly susceptible to catastrophic accidents such as gas explosions due to its ubiquitous distribution and tendency to accumulate. During directional drilling, traditional techniques commonly employ four-way blowout preventers (BOPs) to effectively prevent gas overflow and accumulation. However, in practical applications, especially during the initial drilling phase and the final drilling phase, frequent drill pipe movement and limited borehole space often prevent the timely installation of BOPs, leaving gas issues in these critical stages uncontrolled for extended periods. If drilling operations are prolonged or the final drilling phase is delayed, the gas concentration around the borehole can rapidly rise and exceed safety thresholds. Furthermore, existing directional drilling BOPs are generally bulky, have numerous connection points, and complex layouts. Disassembly and reassembly are necessary for hydraulic fracturing or other auxiliary processes, making it impossible to maintain continuous real-time gas extraction capabilities. Meanwhile, the installation process of the device is cumbersome and time-consuming, often requiring interruptions to the gas extraction operation. This not only significantly reduces construction efficiency but also further exacerbates the safety risk of local gas exceedances, seriously threatening the stability of the coal mine working environment and the safety of personnel. Summary of the Invention

[0003] This invention aims to solve at least one of the technical problems existing in related technologies. To this end, this invention proposes a real-time gas drainage device for kilometer-long directional drilling, which has the advantages of compact structure, convenient installation, continuous real-time gas drainage throughout the drilling process, effective prevention of gas exceeding limits, and improved safety and production efficiency in coal mines.

[0004] The real-time gas drainage device for kilometer directional drilling according to an embodiment of the present invention includes: A main pipe section, one end of which is used to connect to a borehole, and a drill rod adapted to pass through the other end of the main pipe section for continuous drilling; The first extraction pipeline is connected to the main pipeline section; A multi-way valve is located at the end of the main pipe section away from the borehole and is connected to the main pipe section. A primary gas-liquid separator is connected to the multi-way valve via a first pipeline. The second extraction pipeline is connected to the multi-way valve.

[0005] The real-time gas drainage device for kilometer directional drilling according to an embodiment of the present invention allows continuous drilling of the drill rod by setting a main pipe section docking borehole, and simultaneously using a multi-way valve to connect the first drainage pipeline, the second drainage pipeline and the first-stage gas-water separator to realize real-time gas drainage during the drilling process. This avoids the gas runaway problem in the opening and retraction stages of traditional technologies. It has the advantages of compact structure, convenient installation, continuous real-time gas drainage throughout the drilling process, effective prevention of gas exceeding limits, and improved safety production efficiency in coal mines.

[0006] According to one embodiment of the present invention, the second extraction pipeline includes: The first pipe section, one end of which is connected to the multi-way valve; The second pipe section is connected at one end to the first-stage gas-liquid separator; The discharge pipe section is connected to the end of the first pipe section away from the multi-way valve and to the end of the second pipe section away from the first-stage gas-water separator.

[0007] According to one embodiment of the present invention, the first pipe section is connected above the multi-way valve, and a portion of the first pipe section is horizontally arranged; And / or, the second pipe section is connected above the first-stage gas-water separator, and part of the second pipe section is horizontally arranged.

[0008] According to one embodiment of the present invention, the first pipeline is connected below the multi-way valve, and the height of the primary gas-water separator is lower than the height of the multi-way valve; And / or, the diameter of the first pipeline is greater than the diameter of the second extraction pipeline.

[0009] According to one embodiment of the present invention, the kilometer-long directional drilling real-time gas drainage device further includes a secondary gas-water separator, which is connected to the first drainage pipeline and the second drainage pipeline respectively. The secondary gas-water separator is located above the first drainage pipeline and the second drainage pipeline, and an exhaust port is provided above the secondary gas-water separator.

[0010] According to one embodiment of the present invention, the bottom of the secondary gas-water separator is provided with a drain outlet, and a control valve is provided at the drain outlet.

[0011] According to one embodiment of the present invention, the kilometer-long directional drilling real-time gas drainage device further includes an extraction component, which is sleeved on the main pipe section. The extraction component has an extraction channel and an extraction hole communicating with the extraction channel. The extraction hole is connected to the main pipe section. The first extraction pipeline is connected to the extraction component and communicates with the extraction channel.

[0012] According to one embodiment of the present invention, the extraction component includes: A circular segment is fitted onto the main pipe segment. The circular segment has a circular channel. The inner ring of the circular segment has an air extraction hole, which is connected to the circular channel. The connecting section has one end connected to the annular section and the other end connected to the first extraction pipeline. The connecting section is provided with a connecting channel, which communicates with the annular channel to form the extraction channel.

[0013] According to one embodiment of the present invention, the annular segment is provided with a plurality of air extraction holes, and the plurality of air extraction holes are spaced apart along the upper semicircular region of the annular segment; And / or, the bottom of the annular segment is provided with a drainage hole that connects to the annular channel.

[0014] According to one embodiment of the present invention, the kilometer-long directional drilling real-time gas drainage device further includes a sealing pipe, which is disposed in the borehole, and the end of the main pipe section away from the multi-way valve is connected to the sealing pipe.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the kilometer-long directional drilling real-time gas drainage device provided in an embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of the extraction component provided in an embodiment of the present invention.

[0019] Figure 3 This is a side cross-sectional view of the extraction component provided in an embodiment of the present invention.

[0020] Figure label: 1. Main pipe section; 2. First extraction pipeline; 3. First pipeline; 4. Multi-way valve; 5. First-stage gas-liquid separator; 6. Second extraction pipeline; 61. First pipe section; 62. Second pipe section; 63. Discharge pipe section; 7. Second-stage gas-liquid separator; 71. Exhaust port; 72. Drain port; 8. Extraction components; 81. Extraction channel; 82. Circular section; 821. Circular channel; 822. Extraction port; 823. Drain port; 83. Connecting section; 831. Connecting channel; 9. Sealing pipe. Detailed Implementation

[0021] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] Traditional mine gas control methods utilize four-way blowout preventers (BOPs) for gas extraction during directional drilling. However, these BOPs cannot be installed or need to be disassembled during borehole opening, the final stage of drilling, and hydraulic fracturing, leading to interruptions in gas extraction and increasing the risk of localized gas exceedances. Furthermore, traditional devices are bulky and complex to install, resulting in time-consuming installation processes that reduce operational efficiency and prevent real-time, continuous gas extraction.

[0027] In this regard, such as Figure 1 As shown, this application proposes a real-time gas drainage device for kilometer-long directional drilling, comprising: a main pipe section 1, one end of which is used to connect to the borehole, and a drill rod adapted to pass through the other end of the main pipe section 1 for continuous drilling; a first drainage pipeline 2, which is connected to the main pipe section 1; a multi-way valve 4, which is located at the end of the main pipe section 1 away from the borehole and is connected to the main pipe section 1; a primary gas-water separator 5, which is connected to the multi-way valve 4 through a first pipeline 3; and a second drainage pipeline 6, which is connected to the multi-way valve 4.

[0028] Understandably, one end of the main pipe section 1 is designed to be mechanically or sealingly connected to the borehole opening, such as through a threaded connection, flange connection, or compression seal. The other end of the main pipe section 1 remains open to allow the drill pipe to pass freely during drilling. The inner diameter of the main pipe section 1 is designed to be larger than the outer diameter of the drill pipe to ensure smooth movement of the drill pipe within it.

[0029] One end of the first extraction pipeline 2 is connected to the side wall of the main pipeline section 1 through a hole, welding, or threaded interface, thereby achieving gas communication. The other end of the first extraction pipeline 2 is connected to an external extraction system or gas storage equipment.

[0030] The multi-way valve 4 can be a three-way or four-way valve, with one port connected to the end of the main pipe section 1 furthest from the borehole, for example, via a flange or threaded connection. Optionally, the multi-way valve 4 has an internal rotatable or sliding valve core for controlling the flow of gas between different outlets.

[0031] The primary gas-liquid separator 5 can be a gravity settling or cyclone separator, its internal structure designed to facilitate the separation and settling of liquid droplets in the gas. The inlet of the primary gas-liquid separator 5 is connected to one outlet of a multi-way valve 4 via a first pipe 3. The primary gas-liquid separator 5 typically has a gas outlet and a liquid outlet.

[0032] The second extraction pipeline 6 has one end connected to the other outlet of the multi-way valve 4, thus forming another gas extraction path. The other end of the second extraction pipeline 6 can be connected to a backup extraction system, a discharge port, or merge with the first extraction pipeline 2.

[0033] This device ensures continuous gas extraction during drilling through the stable connection of the main pipe section 1 to the borehole and the continuous insertion of the drill pipe. The multi-way valve 4 enables flexible control and diversion of the gas flow, and in conjunction with the primary gas-water separator 5, it provides preliminary gas treatment, effectively reducing the gas concentration. Therefore, this device solves the problems of gas extraction interruption and exceeding limits caused by the inability to install traditional blowout preventers during borehole opening and the final stages of drill retraction, enabling real-time gas extraction during kilometer-long directional drilling operations.

[0034] This application further proposes a second extraction pipeline 6 including a first pipeline section 61, a second pipeline section 62 and a discharge pipeline section 63. One end of the first pipeline section 61 is connected to a multi-way valve 4; one end of the second pipeline section 62 is connected to a primary gas-water separator 5; and the discharge pipeline section 63 is connected to the end of the first pipeline section 61 away from the multi-way valve 4 and to the end of the second pipeline section 62 away from the primary gas-water separator 5.

[0035] The second extraction pipeline 6 is used to extract gas from the equipment and transport it to subsequent processing units. Its main function is to ensure that gas can be effectively and continuously extracted, avoiding leaks or blockages during the extraction process. Specifically, the second extraction pipeline 6 can be made of metal pipes, steel wire hoses, or composite material pipes to meet the corrosion resistance, pressure resistance, and wear resistance requirements of the underground gas extraction environment. Its inner wall can be smoothed to reduce fluid resistance and improve extraction efficiency.

[0036] The first pipe section 61 is part of the second extraction pipeline 6, with one end connected to the multi-way valve 4, responsible for receiving the gas mixture from the multi-way valve 4. This pipe section is the initial path for gas to enter the extraction pipeline from the main unit. Specifically, the first pipe section 61 can be connected to the multi-way valve 4 using various connection methods, such as flange connection, threaded connection, or quick coupling connection, to ensure the sealing and stability of the connection. Its structure can be a straight pipe, a bend, or a pipe section with flexible connections to adapt to different installation space and layout requirements.

[0037] The second pipe section 62 is another part of the second extraction pipeline 6. One end of it is connected to the primary gas-liquid separator 5, and it is mainly used to transport the gas processed by the primary gas-liquid separator 5 to the discharge pipe section 63. The connection method of this pipe section can be similar to that of the first pipe section 61, such as using flange connection, threaded connection or welding connection, to ensure a reliable connection with the primary gas-liquid separator 5. Its length and direction can be optimized according to the overall layout of the device to reduce bends and reduce fluid resistance.

[0038] The discharge section 63 is the final outlet of the second extraction pipeline 6. It connects to the end of the first pipeline 61 furthest from the multi-way valve 4 and to the end of the second pipeline 62 furthest from the primary gas-liquid separator 5. The function of this section is to combine and discharge the gas from the first and second pipelines 61 and 62. Specifically, the discharge section 63 can be designed as a Y-joint, T-joint, or manifold to achieve the convergence of multiple gas streams. Its outlet can be connected to an extraction pumping station or a further gas treatment system. For ease of maintenance and repair, a shut-off valve or flow meter can be installed on the discharge section 63.

[0039] This application further proposes that the first pipe section 61 is connected above the multi-way valve 4, and part of the first pipe section 61 is set horizontally; optionally, the second pipe section 62 is connected above the first-stage gas-water separator 5, and part of the second pipe section 62 is set horizontally.

[0040] Specifically, the first pipe section 61 is connected above the multi-way valve 4 to optimize the path of gas from the multi-way valve 4 into the first pipe section 61. The inlet of the first pipe section 61 can be located in the upper region of the multi-way valve 4, for example, by creating a connection port at the top or upper side wall of the multi-way valve 4, allowing the first pipe section 61 to be accessed from above. Alternatively, the first pipe section 61 can extend upwards for a distance before turning and connecting, thus utilizing the characteristic that gas density is less than liquid density to reduce the possibility of liquid impurities entering the first pipe section 61 due to gravity, ensuring the purity of the gas flow. Simultaneously, the partial horizontal arrangement of the first pipe section 61 aims to provide a stable transmission channel for the gas. This ensures that a portion of the pipe in the first pipe section 61 is laid horizontally, i.e., parallel to the ground or a reference horizontal plane, thereby avoiding excessive slope changes in the pipeline, reducing turbulence or local pressure fluctuations during gas flow, and ensuring the continuity and stability of gas transmission.

[0041] Furthermore, the second pipe section 62 is connected above the primary gas-liquid separator 5, designed to optimize the discharge path of the gas after treatment by the primary gas-liquid separator 5. The inlet of the second pipe section 62 can be located in the upper region of the primary gas-liquid separator 5, for example, by opening an outlet at the top or upper side wall of the primary gas-liquid separator 5, allowing the second pipe section 62 to be accessed from above. Alternatively, the second pipe section 62 can be directly led out from the top of the primary gas-liquid separator 5, thus fully utilizing the natural upward trend of the gas after gas-liquid separation, ensuring that the separated pure gas can be discharged efficiently and smoothly, avoiding the re-carrying of separated liquid. Moreover, the partial horizontal arrangement of the second pipe section 62 aims to provide a stable transmission channel for the gas discharged from the primary gas-liquid separator 5. This ensures that a portion of the pipe in the second pipe section 62 is laid horizontally, i.e., parallel to the ground or a reference horizontal plane, effectively preventing liquid stagnation or gas backflow in the pipe, maintaining the continuity and stability of gas flow.

[0042] This application further proposes that the first pipeline 3 is connected below the multi-way valve 4, and the height of the first-stage gas-water separator 5 is lower than the height of the multi-way valve 4; optionally, the diameter of the first pipeline 3 is greater than the diameter of the second extraction pipeline 6.

[0043] For example, the inlet end of the first pipe 3 can be flanged or threaded to the bottom interface of the multi-way valve 4, ensuring that the connection point is located at the lowest liquid level outlet of the multi-way valve 4. Alternatively, the multi-way valve 4 can be designed with a dedicated downward-sloping outlet, to which the first pipe 3 is connected by welding or clamping to guide the liquid downward flow.

[0044] Meanwhile, the height of the primary gas-liquid separator 5 is lower than that of the multi-way valve 4. By setting a suitable height difference, gravitational potential energy is provided for the gas-liquid mixture to flow from the multi-way valve 4 to the primary gas-liquid separator 5, further promoting the natural downward flow of the liquid and improving the gas-liquid separation efficiency. For example, the primary gas-liquid separator 5 can be installed on the ground or on a dedicated bracket lower than the multi-way valve 4, ensuring that its inlet is lower than the liquid level outlet of the multi-way valve 4. Alternatively, the multi-way valve 4 can be installed on a higher operating platform or equipment rack, while the primary gas-liquid separator 5 is placed directly on the lower ground or in a pit, thus creating a significant height difference.

[0045] Furthermore, the diameter of the first pipeline 3 is larger than that of the second extraction pipeline 6. This is intended to reduce the flow resistance of the gas-water mixture during transportation, improve transportation efficiency, and reduce problems such as incomplete gas-water separation caused by pipeline blockage or excessive flow velocity by increasing the diameter of the first pipeline 3. For example, the first pipeline 3 can be selected with a diameter of DN150, while the second extraction pipeline 6 can be selected with a diameter of DN50, to ensure that the first pipeline 3 has a greater flow capacity. Alternatively, the first pipeline 3 can be selected with a diameter of DN80, while the second extraction pipeline 6 can be selected with a diameter of DN40, thereby providing more spacious flow space for the gas-water mixture while ensuring sufficient flow rate.

[0046] This application further proposes that the kilometer-long directional drilling real-time gas drainage device also includes a secondary gas-water separator 7, which is connected to the first drainage pipeline 2 and the second drainage pipeline 6 respectively. The secondary gas-water separator 7 is located above the first drainage pipeline 2 and the second drainage pipeline 6, and an exhaust port 71 is provided above the secondary gas-water separator 7.

[0047] The secondary gas-liquid separator 7 is a device used to further separate liquid droplets or solid particles entrained in the gas. It is typically used after primary separation to improve gas purity. Specifically, the secondary gas-liquid separator 7 can employ the principle of cyclone separation, using high-speed rotating airflow to generate centrifugal force, causing droplets or particles to impact the wall and flow down the wall; or, the secondary gas-liquid separator 7 can employ the principle of filtration separation, using porous media (such as filter screens or fiber pads) to intercept droplets or particles, causing them to aggregate and settle.

[0048] The secondary gas-water separator 7 is connected to the first extraction pipeline 2 and the second extraction pipeline 6, respectively. Its purpose is to collect gases and moisture from different extraction paths and process them uniformly in the secondary separator, ensuring that all extracted gases are fully purified. Specifically, the first extraction pipeline 2 and the second extraction pipeline 6 can be connected to the inlet of the secondary gas-water separator 7 via their respective independent connecting pipes.

[0049] The secondary gas-liquid separator 7 is located above the first extraction pipeline 2 and the second extraction pipeline 6. Utilizing gravity, it facilitates the downward flow of the separated liquid, preventing backflow or accumulation in the pipeline, while also making it easier for the gas to be discharged upwards. Specifically, the secondary gas-liquid separator 7 can be installed on a support or platform higher than the main body of the first extraction pipeline 2 and the second extraction pipeline 6; alternatively, during system design, the installation position of the secondary gas-liquid separator 7 can be planned near the highest point of the entire extraction pipeline system to form a natural upward channel for gas and a downward channel for liquid.

[0050] The secondary gas-water separator 7 has an exhaust port 71 at its top to discharge the purified gas after secondary separation, ensuring that the gas can be smoothly and continuously drawn away and preventing pressure buildup inside the separator. Specifically, one or more outlets connected to an external extraction system can be provided at the top of the secondary gas-water separator 7, and these outlets can be directly connected to the main extraction pipeline.

[0051] By introducing a secondary gas-liquid separator 7 as an additional device through the above technical solution, the thoroughness of gas-liquid separation is enhanced, solving the problem of residual moisture or impurities that may remain in single-stage separation, thereby improving the efficiency and safety of gas extraction. Specifically, the addition of the secondary gas-liquid separator 7 provides a second-stage processing stage, making up for the deficiencies of the first-stage separation and ensuring purer gas; the secondary gas-liquid separator 7 is connected to the first extraction pipeline 2 and the second extraction pipeline 6 respectively, integrating the fluids from multiple extraction sources, avoiding the system complexity caused by separate processing, and achieving unified and efficient separation; the secondary gas-liquid separator 7 is located above the first extraction pipeline 2 and the second extraction pipeline 6, using the principle of gravity to promote the rise of gas and the sinking of moisture, optimizing the separation process; an exhaust port 71 is opened at the top of the secondary gas-liquid separator 7 to facilitate the direct discharge of the separated gas, preventing gas accumulation and ensuring the safety and continuity of the extraction process.

[0052] This application further proposes the above-mentioned real-time gas drainage device for kilometer directional drilling, wherein the bottom of the secondary gas-water separator 7 is provided with a drain outlet 72, and a control valve is provided at the drain outlet 72.

[0053] Specifically, the drain outlet 72 is a channel located at the bottom of the secondary gas-liquid separator 7, used to discharge the liquid water separated from the gas during the gas extraction process. Since water settles to the bottom of the secondary gas-liquid separator 7 under gravity, the drain outlet 72 ensures that the separated water is effectively collected and discharged, preventing water accumulation inside the separator and affecting its normal operating efficiency. The drain outlet 72 can be a simple opening directly connected to the external environment or a collection container, or it can be a structure with a connection interface for connecting external drainage pipes or hoses.

[0054] Furthermore, a control valve is installed on the aforementioned drain outlet 72 to control the discharge of liquid water. The control valve enables the opening and closing of the drain channel and flow regulation, thereby performing drainage operations when needed and effectively preventing gas leakage during non-drainage periods. The control valve can be a manually operated ball valve or gate valve, controlled by rotating a handle or lever; or it can be an electrically or pneumatically controlled valve, operated via remote control or an automated system.

[0055] Please refer to the reference. Figure 1 , Figure 2 and Figure 3 This application further proposes that the kilometer-long directional drilling real-time gas drainage device also includes a drainage component 8, which is fitted onto the main pipe section 1. The drainage component 8 has a gas extraction channel 81 and a gas extraction hole 822 that connects to the gas extraction channel 81. The gas extraction hole 822 is connected to the main pipe section 1. The first drainage pipeline 2 is connected to the drainage component 8 and is connected to the gas extraction channel 81.

[0056] Specifically, the extraction component 8 is a structural member used to extract gas from the borehole or the main pipe section 1. The extraction component 8 can be designed as a one-piece annular structure with a pre-reserved extraction channel 81 and extraction port 822 inside; alternatively, the extraction component 8 can be composed of multiple detachable modules, assembled onto the outside of the main pipe section 1 by bolts or clips to form a complete extraction structure. The extraction component 8 being "sleeved onto the main pipe section 1" means that it is installed around or wrapped around the outside of the main pipe section 1. The extraction component 8 can be fixed to the outer wall of the main pipe section 1 using an interference fit or threaded connection to ensure a tight and airtight connection. The extraction component 8 has an "extraction channel 81" inside, which is a fluid channel inside the extraction component 8 for collecting and transporting gas. The extraction channel 81 can be designed as an annular cavity inside the extraction component 8 for collecting gas from the extraction port 822. The extraction component 8 also has an extraction hole 822 that connects to the extraction channel 81. This extraction hole 822 is a hole on the extraction component 8 that directly connects to the interior of the main pipe section 1, used to introduce gas from the main pipe section 1 into the extraction channel 81. The extraction hole 822 can be designed as a circular or elliptical hole evenly distributed along the inner wall of the extraction component 8 to achieve balanced gas extraction. The extraction hole 822 can directly penetrate the inner wall of the extraction component 8 and make close contact with the outer wall of the main pipe section 1 to form a gas flow path; or, the extraction hole 822 can be aligned with a pre-reserved hole on the outer wall of the main pipe section 1, and the connection can be sealed by means of a sealing ring or other means. In addition, the first extraction pipeline 2 is connected to the extraction component 8 and is connected to the extraction channel 81, which is intended to transport the gas collected by the extraction component 8 to the first extraction pipeline 2. The first extraction pipeline 2 can be connected to the outlet end of the extraction component 8 by means of flange connection, threaded connection or quick coupling, etc.

[0057] The first extraction pipeline 2 is connected to the extraction component 8 and communicates with the extraction channel 81, ensuring that gas can be smoothly transported from the extraction component 8 to the subsequent extraction system. This design allows the gas extraction process to continue throughout the entire drilling cycle (including the opening and final drilling stages), effectively avoiding the extraction interruption problem caused by the inconvenience of installation in traditional devices. Therefore, this solution can achieve real-time and continuous gas extraction, significantly reducing the risk of gas exceeding limits and improving the safety of coal mine operations.

[0058] This application further proposes the extraction component 8 of the aforementioned kilometer-directed drilling real-time gas drainage device, which includes an annular section 82 and a connecting section 83.

[0059] Specifically, the annular segment 82 is fitted onto the main pipe section 1. The annular segment 82 has an annular channel 821, and its inner ring has an extraction port 822, which communicates with the annular channel 821. The annular segment 82 is a ring-shaped structure designed to fit around the main pipe section 1, forming an annular channel for collecting methane. Fitting the annular segment 82 onto the main pipe section 1 ensures a tight fit between the extraction component 8 and the main pipe section 1, achieving effective capture of methane within the borehole. The interior of the annular segment 82 can be designed as a hollow structure, forming a continuous annular cavity as the annular channel 821. The extraction ports 822 on the inner ring of the annular segment 82 serve as the entry points for methane from the main pipe section 1 into the annular channel 821. The communication between the extraction ports 822 and the annular channel 821 ensures that methane gas flows smoothly from the main pipe section 1 into the annular channel 821 through the extraction ports 822.

[0060] Furthermore, one end of the connecting section 83 is connected to the annular section 82, and the other end is connected to the first extraction pipeline 2. The connecting section 83 is provided with a connecting channel 831, which communicates with the annular channel 821 to form an extraction channel 81. The connecting section 83 is a transition structure for connecting the annular section 82 and the first extraction pipeline 2. It has a connecting channel 831 inside to drain the gas in the annular channel 821. One end of the connecting section 83 is connected to the annular section 82 to ensure that the gas in the annular channel 821 can be effectively drained.

[0061] The annular channel 821 serves as the initial collection space for gas, helping to stabilize gas flow and reduce local resistance. The connecting section 83 connects the annular section 82 and the first extraction pipeline 2, and is equipped with a connecting channel 831, acting as a bridge between the annular channel 821 and the first extraction pipeline 2, ensuring smooth gas transmission from the collection area to the extraction system. The connecting channel 831 connects with the annular channel 821 to form a complete extraction channel 81, allowing gas to be efficiently extracted from the annular section 82 and enter the first extraction pipeline 2 for further processing. Gas can be extracted in real time and stably, effectively reducing the risk of gas exceeding limits and ensuring the safety of drilling operations.

[0062] This application further proposes that the annular segment 82 is provided with a plurality of air extraction holes 822, which are spaced apart along the upper semicircular area of ​​the annular segment 82. Optionally, the bottom of the annular segment 82 is provided with a drain hole 823 that connects to the annular channel 821.

[0063] The multiple extraction holes 822 refer to the holes for extracting methane gas provided on the annular section 82 of the extraction component 8, and the number of these holes is greater than one. Providing multiple extraction holes 822 aims to increase the effective contact area and extraction points for methane extraction, thereby expanding the coverage area of ​​methane extraction and ensuring that methane can be extracted more fully. For example, multiple circular, elliptical, or slit-shaped holes can be uniformly or non-uniformly distributed along the circumferential or axial direction on the inner wall of the annular section 82.

[0064] Multiple extraction ports 822 are spaced apart along the upper semicircular region of the annular segment 82. The upper semicircular region typically refers to the portion above the horizontal centerline of the cross-section of the annular segment 82. Spaced apart means that these extraction ports 822 are spatially spaced, rather than tightly arranged. Given that methane gas is less dense than air and tends to accumulate in the upper part of the pipe, concentrating the extraction ports 822 in the upper semicircular region allows for more effective capture of the accumulated methane.

[0065] The bottom of the annular section 82 is provided with a drainage hole 823 that connects to the annular channel 821. The drainage hole 823 refers to a hole set at the lowest point or bottom area of ​​the annular section 82 for draining accumulated water. The function of the drainage hole 823 is to allow liquid (such as water in the borehole or condensate) to drain from the bottom of the annular channel 821, preventing water accumulation from blocking the air extraction channel 81, thereby maintaining the smooth flow and efficiency of the extraction system.

[0066] This application proposes a real-time gas drainage device for kilometer-long directional drilling, which also includes a sealing pipe 9. The sealing pipe 9 is a specialized component designed to adhere to the inner wall of the borehole, its primary function being to prevent borehole collapse. In actual operation, the sealing pipe 9 can be precisely inserted into a predetermined position within the borehole using a drill rod, a specialized pipe-down tool, or a guide device, and then secured. Specifically, the sealing pipe 9 forms a reliable physical barrier inside the borehole, effectively improving the structural stability at the borehole opening.

[0067] Finally, it should be noted that the above embodiments are only for illustrating the present invention and not for limiting the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications, or equivalent substitutions of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention and should be covered within the scope of the claims of the present invention.

Claims

1. A real-time gas drainage device for kilometer-long directional drilling, characterized in that, include: A main pipe section, one end of which is used to connect to a borehole, and a drill rod adapted to pass through the other end of the main pipe section for continuous drilling; The first extraction pipeline is connected to the main pipeline section; A multi-way valve is located at the end of the main pipe section away from the borehole and is connected to the main pipe section. A primary gas-liquid separator is connected to the multi-way valve via a first pipeline. The second extraction pipeline is connected to the multi-way valve.

2. The real-time gas drainage device for kilometer-long directional drilling according to claim 1, characterized in that, The second extraction pipeline includes: The first pipe section, one end of which is connected to the multi-way valve; The second pipe section is connected at one end to the first-stage gas-liquid separator; The discharge pipe section is connected to the end of the first pipe section away from the multi-way valve and to the end of the second pipe section away from the first-stage gas-water separator.

3. The real-time gas drainage device for kilometer-long directional drilling according to claim 2, characterized in that, The first pipe section is connected above the multi-way valve, and part of the first pipe section is set horizontally; And / or, the second pipe section is connected above the first-stage gas-water separator, and part of the second pipe section is horizontally arranged.

4. The real-time gas drainage device for kilometer-long directional drilling according to claim 1, characterized in that, The first pipeline is connected below the multi-way valve, and the height of the first-stage gas-water separator is lower than the height of the multi-way valve; And / or, the diameter of the first pipeline is greater than the diameter of the second extraction pipeline.

5. The real-time gas drainage device for kilometer-long directional drilling according to claim 1, characterized in that, The kilometer-long directional drilling real-time gas drainage device also includes a secondary gas-water separator, which is connected to the first drainage pipeline and the second drainage pipeline respectively. The secondary gas-water separator is located above the first drainage pipeline and the second drainage pipeline, and an exhaust port is provided above the secondary gas-water separator.

6. The real-time gas drainage device for kilometer-long directional drilling according to claim 5, characterized in that, The bottom of the secondary gas-water separator is provided with a drain outlet, and a control valve is provided at the drain outlet.

7. The real-time gas drainage device for kilometer-long directional drilling according to any one of claims 1 to 6, characterized in that, The kilometer-long directional drilling real-time gas drainage device also includes a drainage component, which is sleeved on the main pipe section. The drainage component has a gas extraction channel and a gas extraction hole that connects to the gas extraction channel. The gas extraction hole is connected to the main pipe section. The first drainage pipeline is connected to the drainage component and is connected to the gas extraction channel.

8. The real-time gas drainage device for kilometer-long directional drilling according to claim 7, characterized in that, The extraction component includes: A circular segment is fitted onto the main pipe segment. The circular segment has a circular channel. The inner ring of the circular segment has an air extraction hole, which is connected to the circular channel. The connecting section has one end connected to the annular section and the other end connected to the first extraction pipeline. The connecting section is provided with a connecting channel, which communicates with the annular channel to form the extraction channel.

9. The real-time gas drainage device for kilometer-long directional drilling according to claim 8, characterized in that, The annular segment is provided with a plurality of air extraction holes, which are spaced apart along the upper semicircular region of the annular segment. And / or, the bottom of the annular segment is provided with a drainage hole that connects to the annular channel.

10. The real-time gas drainage device for kilometer-long directional drilling according to any one of claims 1 to 6, characterized in that, The kilometer-long directional drilling real-time gas drainage device also includes a sealing pipe, which is located inside the borehole, and the end of the main pipe that is away from the multi-way valve is connected to the sealing pipe.

Images