125 results about "Soft Coals" patented technology

The invention discloses a method for rapidly and efficiently extracting coal mine gas in a broken and soft coal seam, and belongs to the technical field of coal seam gas development and coal mine gas prevention and control. According to the method, geological features of a coal mining planning area are determined, a ground U-shaped well and underground bottom-pumped rock drift layer-crossing drilling combined treatment system is deployed, and regional large-scale treatment is achieved in a well factory mode; the fracturing transformation range and the fracturing fluid distribution characteristics are detected by using a ground and underground combined micro-seismic monitoring and underground transient electromagnetic method, and the arrangement of layer-crossing drill holes is optimized; dividing the cross-layer drill holes into drainage holes and air exhaust holes, and formulating a collaborative extraction system in combination with different drainage and extraction stages; the method solves the problems that broken soft coal seam gas extraction is low in efficiency and long in period, and treatment blind areas exist, treatment time is remarkably shortened, cost is reduced, and safe and efficient production of a coal mine is guaranteed.

The invention relates to the technical field of coal mine gas extraction, and discloses a hole protecting device and method for a gas extraction drill hole. The hole protection device for the gas extraction drill hole comprises a first hole protection section and a second hole protection section, the first hole protection section comprises a first pipeline, an air bag assembly and a foldable suspension structure, and the suspension structure and the air bag assembly are both arranged on the outer wall of the first pipeline; the guide structure is arranged outside the first hole protection section in a sleeving mode so as to restrain the suspension structure and enable the suspension structure to be stored in the guide structure, and under the condition that the guide structure moves and exposes the suspension structure, the suspension structure is unfolded and clamped on the inner wall of a hole; the inflating device is communicated with the air bag assembly and used for inflating the air bag assembly, so that the air bag assembly is attached to the inner wall of the hole, and the hole is supported. In this way, a three-dimensional supporting system is formed by radial supporting force generated by expansion of the air bag assembly and axial anchoring of the suspension structure, and the hole collapse resistance of the soft coal seam is remarkably improved.

The invention discloses a soft coal seam nanofluid fracturing propping material and a preparation method thereof.The soft coal seam nanofluid fracturing propping material is prepared from, by weight, 80-90% of a base material, 1-5% of a super-hydrophobic coating, 5-10% of a catalytic active component and 5-15% of a rheological enhancer, the base material is a compound of high-purity silicon dioxide nanoparticles and graphene nanosheets GNP, the particle size of the high-purity silicon dioxide nanoparticles is 50-200 nm, the super-hydrophobic coating is a fluorosilane modified layer, the thickness of the super-hydrophobic coating is 5-20 nm, and the invention relates to the technical field of coal bed gas exploitation. According to the soft coal seam nanofluid fracturing propping material and the preparation method thereof, the surface of the material is provided with a super-hydrophobic coating, friction force with a coal matrix is reduced, high embedding resistance is achieved, the flow conductivity is specifically enhanced, an extra flow channel is provided through a porous nanostructure, the fracturing fluid permeability is improved, and meanwhile gas desorption can be cooperated; catalytic active sites are introduced to the surface of the material to promote adsorption and diffusion of methane molecules.

The invention provides a high-quality cross-boundary continuous grading support system suitable for a soft coal rock roadway in a complex environment, which relates to the technical field of coal mine roadway support and comprises a first-stage foundation support system, a second-stage reinforced support system and an intelligent monitoring system, the first-stage foundation support system, the second-stage foundation support system and the third-stage foundation support system cooperate with one another to achieve continuous graded support and long-time stable control of roadway surrounding rock, and the first-stage foundation support system is used for achieving surrounding rock shallow constraint, preliminary stress release and preliminary rock mass consolidation; through continuous cooperative control of first-stage foundation support and second-stage reinforced support and application of a novel support material, rheological and swelling deformation of surrounding rock can be effectively restrained, and practical application verifies that side deformation and top deformation of a roadway are reduced, and the bulging amount of a bottom plate is controlled within safety limit values; through the design of lagging grouting full anchoring and collaborative anchoring, fractured rock mass is effectively consolidated and repaired, the stress concentration degree of surrounding rock is improved, and the problem that an existing support is poor in long-term stability is solved.

The invention relates to the technical field of coal mine gas control and CO2 geological storage, and particularly discloses a soft coal seam dynamic fracture self-adaptive CO2 displacement-anti-reflection integrated system which comprises a dynamic fracture monitoring unit, a CO2 collaborative anti-reflection unit, a self-adaptive regulation and control unit and a safety protection unit. The dynamic fracture monitoring unit is used for capturing coal seam fracture development dynamics and gas injection process parameters in real time; the self-adaptive regulation and control unit is in communication connection with the dynamic fracture monitoring unit, and the CO2 synergistic anti-reflection unit is in control connection with the self-adaptive regulation and control unit and is used for realizing CO2 enhanced anti-reflection displacement; the safety protection unit is used for guaranteeing system operation safety. According to the method, real-time adaptation of the coal seam fracture state and the injection-production parameters is achieved, the problems that in a traditional fixed parameter mode, the displacement efficiency attenuation is fast, and the coal body stability is poor are solved, the CH4 recovery rate and the CO2 storage rate are increased, and the safety and high efficiency of soft coal seam gas control operation are guaranteed.

The invention discloses a design method of a high-performance grouting material accurately matched with a soft coal rock physical property structure, and relates to the technical field of geotechnical engineering grouting. According to the method, mineral components, permeability, fracture distribution, strength, wettability and hydrological characteristics of soft coal rock are analyzed through multi-dimensional tests such as X-ray diffraction and a scanning electron microscope, and a quantitative mapping relation between physical property parameters and grouting material performance is established; constructing a grouting reinforcement material database comprising a material sub-library, a performance sub-library and a case sub-library, and introducing a generative adversarial network to dynamically update the fracture model; an orthogonal test and a machine learning algorithm are adopted to carry out multi-objective ratio optimization, and precise matching of grouting material performance and engineering geological conditions is realized in combination with field adaptability index closed-loop verification. According to the method, the grout groutability and the surrounding rock deformation control effect can be remarkably improved, the technical problems that a traditional grouting material depends on experience, and a database is static and low in efficiency are solved, and an intelligent solution is provided for complex soft coal rock engineering reinforcement.

The invention discloses a device and method for preventing soft coal seam gas extraction drill hole deformation and hole collapse, and relates to the technical field of coal seam gas extraction, the device comprises an anti-collapse mechanism used for ensuring the accuracy and controllability of the reinforcing range and effectively preventing invalid slurry loss, and the anti-collapse mechanism comprises a hole protection sleeve unit, a connecting unit and a bag unit; the bag unit is arranged on the outer side of the connecting unit and comprises a stacked bag installed on the outer side of the stacked casing pipe through the connecting unit, a bottom bag is installed on the outer side of the bottom casing pipe through the connecting unit, and high-strength grout is injected into the bag unit through a high-pressure grouting pump, so that the stacked bag and the bottom bag expand in a drill hole to fill surrounding cracks; and the invalid diffusion path of the slurry is blocked, targeted reinforcement of the soft coal seam is achieved, the problem that the slurry is lost along the maximum crack channel in traditional grouting is solved, the stability of the gas extraction drill hole is remarkably improved, and the service life of the gas extraction drill hole is remarkably prolonged.

The application discloses a soft coal seam acoustic wave penetration method, comprising the following steps: sampling the rock of one side rock stratum of the soft coal seam to be penetrated, obtaining the tensile strength and shear strength of the rock, the one side rock stratum being the coal seam roof or the coal seam floor; drilling a working borehole in the one side rock stratum; implementing impact in the working borehole; the impact wave generated by the impact cracks the rock stratum around the working borehole, the impact wave cracks the rock stratum, and the acoustic wave is formed after the impact wave attenuates, the acoustic wave is used for penetrating the soft coal seam, wherein the stress wave pressure entering the soft coal seam is lower than the tensile strength and shear strength of the rock. The application solves the problems that it is difficult to develop an effective high-strength sound source capable of being loaded to the coal seam and it is difficult to implement drilling in the soft coal seam in the prior art. The application converts the strong impact into high-strength acoustic wave by using the coal seam roof or the coal seam floor rock stratum, the high-strength acoustic wave is used for penetrating and exciting the coal seam, and the required acoustic wave can be obtained, and the gas desorption is promoted.

The present application relates to the technical field of soft coal seam drilling, and discloses an intelligent control drill rod and blowout hole device for soft coal seam drilling, which comprises a front-end sensing unit, a relay sensing unit, a hydraulic servo motor, a frequency converter, a shape memory alloy framework, a thermal-responsive polymer expansion gel layer and a control unit. The device can expand to 3 times the original diameter within 2 seconds through thermal triggering, forming a multi-stage labyrinth seal. The control unit is installed with an embedded AI chip to run an LSTM pressure time sequence prediction model, and combines temperature and vibration multi-source data fusion to judge the blowout risk level, solving the problems of lack of real-time gas pressure dynamic monitoring capability of traditional drill rods, reliance on artificial experience to judge blowout risk, and response lag. The single position pressure sensor is easily disturbed by local rock layer mutation, has a high false alarm rate, and cannot distinguish between normal pressure fluctuations and blowout precursors, so the device realizes early blowout warning and actively suppresses blowout accidents.

The invention discloses a gas graded reinforced extraction method based on the full life cycle of a horizontal well. The gas graded reinforced extraction method comprises the steps that basic occurrence information parameters and gas data of a target coal seam are obtained firstly; constructing a brittle-soft index and evaluating the target coal seam by integrating longitudinal and transverse wave velocity data obtained by logging of the target coal seam; if the coal body is the soft coal body, a horizontal well sectional type hydraulic punching construction scheme is formulated; if the coal body is a brittle coal body, a horizontal well sectional type hydraulic fracturing construction scheme is formulated; horizontal wells and vertical wells are constructed according to corresponding schemes; then, according to the corresponding construction scheme, the horizontal well is divided into sections through packers; after construction is completed, gas drainage is conducted on the horizontal well and the vertical well; in the gas drainage and mining process, the LSTM model is used for predicting and evaluating the future gas drainage and mining trend; if the gas drainage and mining data is in a remarkable descending trend, the supercritical CO2 is injected into the target coal seam in a pulse mode, the gas drainage and mining efficiency is effectively improved, and efficient gas drainage and mining of the horizontal well in the whole life cycle are achieved.

The utility model relates to the field of drilling equipment for soft coal seams, in particular to a sealing structure for a through cable drill rod core joint, which comprises an annular sealing groove, the annular sealing groove comprises a mounting part and a pressure relief part, a sealing piece is sleeved in the mounting part to ensure the sealing performance of the butt joint of an inner joint and an outer joint, and the pressure relief part is arranged on the adjacent side of the mounting part. The mounting part is positioned on the reverse side of the inserting direction; the pressure relief part comprises a deformation containing groove and a pressure relief groove, the deformation containing groove is axially arranged and used for containing the axial deformation of the sealing piece, the pressure relief groove is formed in the bottom face of the deformation containing groove, and the pressure relief groove structure should guarantee that when the sealing piece deforms and enters the pressure relief part, sealing failure is caused by the fact that the radial size of the position where the pressure relief groove is located is increased. In addition, an axial pre-jacking protrusion is arranged at the position, corresponding to the pressure relief portion, of the installation portion, and the sealing piece has initial elastic tension due to the arrangement of the pre-jacking protrusion.

The utility model discloses a soft coal seam gas extraction drilling hole protection device, which relates to the technical field of coal mining, and comprises two bases, the upper surfaces of the two bases are fixedly connected with a U-shaped plate together, a moving plate is arranged below the U-shaped plate, an adjusting mechanism is arranged between the moving plate and the U-shaped plate, and the adjusting mechanism is connected with the U-shaped plate. The moving plate moves through an adjusting mechanism, and the upper surface of the moving plate is fixedly connected with a first motor. The protection pipe is installed on the lower surface of the movable plate, then the movable plate is moved downwards, so that the protection pipe can be moved to the underground in the drilling process, when the protection pipe is about to sink into the ground, the protection pipe is detached, then the movable plate is moved upwards, and then a new protection pipe is installed again. And the new protection pipe is pressed above the protection pipe in the ground, so that a protection pipeline can be formed by repeatedly utilizing a plurality of protection pipes.

The utility model discloses a top coal caving hydraulic support for a soft coal seam, and relates to the technical field of hydraulic supports. The top coal caving hydraulic support for the soft coal seam comprises a hydraulic support structure, the bottom end of the hydraulic support structure is movably connected with a movable base, and an adjusting type traction device is fixedly installed at the top end of the movable base; according to the top coal caving hydraulic support for the soft coal seam, by arranging an adjusting type traction device, a U-shaped plate can be driven by an extension rod to vertically slide on the outer side of a driving box, the U-shaped plate is promoted to drive a traction head to conduct height adjustment, and then height locking can be conducted on the extension rod through a gear ring in cooperation with distance adjustment of a movable rack and a fixed rack; the traction head is positioned after height adjustment, so that the support can be adjusted according to the actual traction height of field traction equipment, normal traction of external traction equipment is guaranteed, and the withdrawing efficiency of the support is improved.

The invention discloses a self-adaptive hole protecting and sealing device and method for soft coal seam gas extraction drilling, the device comprises a sectional type screen pipe, an active hole protecting assembly and a hole sealing assembly, the active hole protecting assembly comprises a multi-section type center hollow rod, a cable and a dynamic hole protecting supporting array; the dynamic hole protection supporting array comprises a supporting unit which stretches out and draws back in the radial direction of the multi-section type center hollow rod, and the supporting unit is used for actively supporting the drilling hole wall and adjusting the supporting force in a real-time and self-adaptive mode. Through a dynamic sensing-active regulation-cooperative sealing closed loop mechanism, the defect of separation of static passive sealing and hole protecting and sealing is overcome. The network distributed electric push rod carries a sensor to monitor hole wall changes in real time, supporting force is independently adjusted, and real-time dynamic hole protection is achieved. And the automatic liquid supplementing cavity is matched with the double-back-pressure valve to automatically maintain the sealing pressure. Hole protecting and hole sealing are in two-way coupling linkage, dynamic sensing and real-time self-adaptive adjustment can be achieved, effective sealing of a drilled hole can be maintained all the time, and organic unification of active hole protecting and hole sealing can be achieved.

The utility model relates to the technical field of coal mining, especially relates to a soft coal seam drilling hole wall stability reinforcing device, including the drill rod installation head, the outer surface of drill rod installation head is provided with the first outer thread, the rear end of drill rod installation head is fixedly connected with the guide assembly, the outer surface front part of guide assembly is fixedly sleeved with the grouting assembly, the outer surface middle part of guide assembly is movably sleeved with the support reinforcing assembly. The utility model discloses a soft coal seam drilling hole wall stability reinforcing device, through inflatable rubber support ring inflation, makes it swell and lets the embedding convex head embeds the hole wall, and the pre-support is formed quickly, and then the slurry is injected into the guide sleeve, and the slurry flows out from the annular array distribution slurry outlet hole and penetrates the coal seam fracture, and the inflatable rubber support ring and the solidified slurry jointly reinforce the hole wall, greatly improve the hole wall stability and the anti-deformation ability, guarantee the safety of soft coal seam drilling operation.

The invention relates to the technical field of coal mine safety engineering, in particular to water injection equipment and a water injection method for a strong-adhesion difficult-to-wet three-soft coal seam. The equipment systematically integrates a water injection pressure adjusting device, a moistening agent adding device, a water injection monitoring device and a protection device. According to the invention, by constructing a closed-loop feedback intelligent water injection system, the technical bottlenecks of poor water injection wettability, non-uniform water transverse dispersion and sweating or water leakage caused by easy plastic deformation of the coal wall due to complex coal body pore structure and low surface free energy in the strong-adhesion and difficult-to-wet three-soft coal seam are effectively solved; the dust falling efficiency and the engineering reliability of coal seam water injection are remarkably improved, and meanwhile the synergistic enhancement effect on coal mine rock burst prevention and control is achieved.

The invention discloses a goaf fracture zone double-sleeve drilling coring device and a dynamic adaptation method.The goaf fracture zone double-sleeve drilling coring device is characterized in that a drilling machine connecting base is installed on a connecting sleeve, the connecting sleeve, an extending sleeve and a coring sleeve are of an inner-outer double-sleeve structure, and an outer pipe of the connecting sleeve is connected with an outer pipe of the extending sleeve or an outer pipe of the coring sleeve; a coring drill bit is installed on the coring sleeve, the permanent magnet array is installed on a rotating base of the coring drilling machine, and the sensor module is installed on the coring sleeve. The outer pipe of the coring sleeve rotates to drill rock, and the inner pipe counteracts interference of rotation of the outer pipe through electromagnetic damping force to keep still. By means of the electromagnetic induction technology, failure of traditional mechanical limiting at a high rotating speed is avoided, and stability of a rock core is effectively guaranteed; based on a rock core state, a dynamic adaptation method is provided. The method can be widely applied to rock core collection of complex stratums such as crushed zones and soft coal walls, the rock core breakage rate is greatly reduced, and the coring completeness is improved.

This invention discloses a nitrogen-driven pneumatic directional drilling equipment for downhole cuttings removal in soft coal seams, comprising a nitrogen drive mechanism and a directional drilling rig. The directional drilling rig has a directional drill string assembly structure, which includes a drill rod. A probe outer tube is coaxially sleeved inside the drill rod, and a measuring probe is coaxially sleeved inside the probe outer tube. The measuring probe is used to measure the gas flow rate and pressure in the borehole. An annular downward air chamber for nitrogen gas flow is formed between the inner wall of the probe outer tube and the outer wall of the measuring probe. An air inlet is opened on the outer wall of the drill rod at the lower part, and an annular upward air chamber for nitrogen gas flow is formed between the inner wall of the drill rod above the air inlet and the outer wall of the probe outer tube. A trumpet-shaped wind shield, wider at the bottom and narrower at the top, is connected to the outer wall of the drill rod above the air inlet. This invention also discloses a corresponding borehole cuttings removal method. This invention significantly reduces the resistance to airflow, achieving faster drilling speeds and removing more cuttings under the same air volume and pressure.

The present invention relates to the technical field of coal seam drilling, and in particular to a layered cutting drilling method and drilling tool for soft coal seams, comprising a first drill rod, a drill bit 1, a second drill rod and a drill bit 2, wherein the drill bit 2 is located between the first drill rod and the second drill rod, and the drill bit 2 is fixedly mounted on the side wall of the second drill rod. The side walls of the second drill rod and the drill bit 2 are respectively provided with a recovery chamber and a sliding hole, and the recovery chamber and the sliding hole are interconnected. The sliding blade drives the casing to perform intermittent drilling, so that the casing always follows the drill bit 2 for synchronous drilling. The thread 1 squeezes the debris between the outer side of the casing and the inner wall of the mining hole, so that the debris forms a thread shape and is evenly distributed on the outer side of the casing, thereby improving the anti-collapse strength of the mining hole. The second drill rod drives the rotating ring to rotate, so that the support rod and the stirring rod stir and loosen the debris between the second drill rod and the casing. The loosened debris reduces the vibration of the second drill rod on the casing, thereby improving the anti-collapse strength of the mining hole.

The present invention provides a non-stop drilling differential make-up and make-up drilling power head and a drilling rig, the drilling rig comprising a feed body, a support plate movably mounted on the feed body; a non-stop drilling differential make-up and make-up drilling power head fixedly mounted on the front of the support plate, a drill rod clamped in the non-stop drilling differential make-up and make-up drilling power head; the non-stop drilling differential make-up and make-up drilling power head comprising a power head body, a front rotator and a rear rotator provided on the top of the power head body, the front rotator and the rear rotator being arranged laterally opposite to each other. The present invention adopts a structural design of front and rear double chucks and two independent sets of gears, and realizes differential rotation of the front chuck and the rear chuck by rationally distributing the rotary power of the two sets of gears, thereby realizing continuous make-up and make-up without stopping drilling, thereby adapting to drilling conditions in formations prone to collapse, such as broken soft coal seams or broken zones, effectively reducing in-hole accidents such as stuck drills and buried drills, and improving the efficiency of make-up and make-up of drill rods.

The invention discloses an earth surface-underground continuous gas extraction method based on a single shaft. The method comprises the steps that an L-shaped horizontal well track is planned based on a coal seam group geology-engineering coupling model; earth surface horizontal well drilling and completion are carried out, and a magnetic positioning short section is preset at a target point; performing multi-stage segmented hydraulic fracturing to construct a fracture network; earth surface drainage and mining pressure reduction is carried out; the underground magnetic steering technology is used for guiding a drill hole to drill through a target spot to achieve physical penetration; installing an underground gas-water separation and control device; and calculating a critical switching threshold value based on a heat-fluid-solid multi-field coupling model, and timely switching from surface drainage to underground negative pressure extraction. According to the method, the wide coverage advantage of surface well drilling and the strong negative pressure advantage of underground extraction are organically combined through the single shaft, the problems that the gas treatment period of the soft coal seam cross-cut coal uncovering area is long, residual gas is difficult to reach the standard, and the underground engineering amount is large are solved, full-life-cycle continuous extraction of gas is achieved, and the gas extraction efficiency is improved. And the parameters are reduced to be below the preset safety threshold value.

The invention discloses a coal seam accurate fracturing and permeability increasing method based on a low-field nuclear magnetic resonance test combined parameter well, samples of different depths of a coal seam are obtained by constructing the parameter well, and parameters such as porosity of the samples of different depths of the coal seam are obtained by testing based on a low-field nuclear magnetic resonance test technology. Then the production casing extends into the well bottom, well cementation is conducted through a well cementation truck special for an oil field, a parameter well is transformed into a fractured well, an accurate fracturing scheme is formulated according to a low-field nuclear magnetic resonance test result, the number of perforations is increased for the position with the low permeability in a reservoir, hydraulic fracturing parameters are adjusted, and therefore a complex fracture network is constructed; fracturing difficulty is reduced, coal seam permeability is effectively improved, and finally accurate permeability increasing of the regional coal seam is achieved. In addition, the low-field nuclear magnetic resonance test method provided by the invention has no requirement on the appearance of a test sample, and can effectively solve the problem that a complete sample cannot be obtained from a soft coal seam.

The invention relates to a mining anchor cable anchoring agent stirring and filling reaming section device which comprises a multi-stage bag breaking mixing component, at least one layered descending guiding component and at least one layered ascending guiding component, the multi-stage bag breaking mixing component wraps the front end face of an anchor cable and is coaxially distributed with the anchor cable, and the layered descending guiding component and the layered ascending guiding component are arranged in the multi-stage bag breaking mixing component. The layered guide descending component covers the anchor cable and is coaxially distributed with the anchor cable, and the layered guide descending component is located between the multi-stage bag breaking mixing component and the layered guide ascending component. The using method comprises the five steps of drilling operation, equipment assembling, anchoring agent lowering, anchoring agent filling and shutdown curing. The device can well solve the problem of how to ensure that an anchoring agent uniformly and fully flows into a reamed hole to the greatest extent in soft coal and rock mass roadway support construction, and has the characteristics of low equipment installation, use, production and processing difficulty, low cost and simplicity and convenience in operation.

The invention provides a broken soft coal seam medium-free continuous while-drilling pressure-maintaining closed coring drilling tool which sequentially comprises an electric drive openable drill bit, a coring cylinder outer pipe assembly and a signal transmission drill rod from front to back in the axial direction, the electric drive openable drill bit, the coring cylinder outer pipe assembly and the signal transmission drill rod are coaxially arranged, and a hollow coring cylinder inner pipe assembly is coaxially installed in the coring cylinder outer pipe assembly. And the electrically-driven openable and closable drill bit is communicated with the signal transmission drill rod, so that the electrically-driven openable and closable drill bit is opened or closed. The coring barrel outer pipe assembly is communicated with the signal transmission drill rod, and axial limiting of the coring barrel inner pipe assembly is achieved. The coring barrel inner pipe assembly is communicated with the signal transmission drill rod, and the two axial ends of an inner cavity of the coring barrel inner pipe assembly are opened or closed. And the outer side wall of the signal transmission drill rod is integrally provided with a spirally wound drill rod fin. The drilling tool is a dry type drilling tool, and it is guaranteed that the obtained coal core sample is free of pollution; according to the drilling tool, water or air does not need to be introduced in the whole drilling process and the whole sampling process, and it is guaranteed that a taken-out coal core sample is consistent with a coal body in a drilled hole in property.

The present invention discloses a system and method for in-situ co-mining of coal and coalbed methane suitable for soft coal seams, which relates to the field of coal mining technology. The system comprises a shaft, a vertical shaft lifting unit, a mining and crushing unit, a secondary crushing unit, a pumping unit, a separation and collection unit, and a roof stability monitoring unit. The mining and crushing unit comprises a shell, a mining mechanism, a water jet mechanism, a transmission mechanism, a crushing mechanism, and a moving mechanism. A bottom storage tank is provided at the bottom of the shaft. The secondary crushing unit is provided at the bottom of the shaft and is located above the bottom storage tank. The pumping unit is used to pump the fluidized coal-water mixture in the bottom storage tank that has been secondary crushed by the secondary crushing unit into the separation and collection unit. The separation and collection unit is used to separate and collect coal, water, and coalbed methane. The system and method reduce costs, shorten the mining cycle, avoid damage to equipment and affect the normal progress of the process, and increase the scope of mining in the coal seam.

The double-wall drilling tool comprises a double-wall water tank, a double-wall drilling rod, a double-wall non-magnetic drilling rod, a double-wall spraying and pumping short section, a pneumatic screw drilling tool and a drilling bit which are connected in sequence, and double channels allowing high-pressure gas, guniting slurry and accumulated water in a hole to pass through are formed. A double-wall drilling tool is adopted, a double-medium flowing channel is formed, wall protection while drilling is achieved in the pneumatic directional drilling process under the condition of the water-containing broken soft coal seam, one part of slurry permeates into micro cracks of the hole wall to play a role in consolidating and reinforcing the hole wall, the other part of slurry can form a wall protection layer with a certain thickness on the periphery of the hole wall of the drill hole, and the effect of protecting the wall is achieved. The effect of supporting the hole wall to be stable is achieved; and the accumulated water in the hole can be reversely pumped and drained by utilizing underground coal mine extraction high negative pressure and through double channels formed by the double-wall drill rod, so that the problem that the hole is difficult to form when meeting water during pneumatic directional drilling is solved.

The invention provides a broken soft coal seam drill-lifting-free directional drilling and punching protection collaborative gas forced pumping machine tool and exploring tube. A high-speed pulse wireless measurement and control while drilling exploring tube is installed in a multi-flow-channel positioning drill rod in a salvageable mode; the high-speed pulse wireless measurement and control while drilling probe tube comprises a transmission seat and a shunting positioning seat, wherein the transmission seat is positioned behind the shunting positioning seat; a flow limiting disc and a flow fixing disc are mounted in the transmission seat; a flow dividing valve and a flow guiding disc are installed in the flow dividing positioning base, and a flow dividing groove is formed in the flow dividing positioning base. The high-speed pulse wireless measurement and control while drilling probe tube has three working states of directional drilling, hydraulic punching and data transmission; the signal transmission rotating motor drives the flow limiting disc to rotate, a high-pressure water flowing channel is changed, and switching of the two working states of directional drilling and data transmission is achieved. The flow channel controls the rotating motor to drive the flow divider valve to rotate, a high-pressure water flowing channel is changed, and switching of the two working states of directional drilling and hydraulic punching is achieved. According to the method, the drilling efficiency, the coverage range and the gas extraction effect of the gas extraction directional drilling of the broken and soft low-permeability coal seam are improved.

The invention relates to the technical field of coal seam drilling, in particular to a rock burst coal seam drilling, reaming and pressure relief drilling machine which comprises a drainage drill rod and a coal seam, the outer side wall of the drainage drill rod is slidably connected with two supporting columns opposite in position, and the side surfaces of the two supporting columns are attached to each other; the end, away from the drainage drill rod, of each supporting column is fixedly connected with a reaming cutter, the reaming cutters can be attached to the outer side wall of the drainage drill rod, the upper ends of the two supporting columns are jointly provided with a driving structure which can drive the two supporting columns to move in the opposite directions, and a drainage column is arranged between each supporting column and the inner wall of the drainage drill rod. When the cutter is lifted, the broaching cutter moves to expand the hole through the internal pressure of the drainage drill rod, meanwhile, the drilling cutter moves to the side edge of the digging head through inertia to scatter coal pieces cut by the broaching cutter, meanwhile, high-pressure water cools the broaching cutter, and the risk of coal seam hole collapse is reduced when a soft coal seam is subjected to broaching.

The application discloses a self-adaptive hole protection and hole sealing device and method for gas extraction drilling in soft coal seams, the device comprising a sectional screen pipe, an active hole protection assembly and a hole sealing assembly, the active hole protection assembly comprising a multi-section center hollow rod, a cable and a dynamic hole protection support array, the dynamic hole protection support array comprising a supporting unit radially extending and retracting along the multi-section center hollow rod, the supporting unit being used for actively supporting the hole wall and real-time self-adaptive adjustment of the supporting force. The application solves the defects of static passive sealing and separation of hole protection and hole sealing through a dynamic sensing-active regulation-coupled sealing closed loop mechanism. The network distributed electric push rod carries a sensor to real-time monitor the hole wall changes, independently adjust the supporting force and realize real-time dynamic hole protection; the automatic liquid supplementing cavity cooperates with the double back pressure valve to automatically maintain the sealing pressure. The hole protection-hole sealing two-way coupling linkage not only can realize dynamic sensing and real-time self-adaptive adjustment, always maintain the effective sealing of the hole, but also can realize the organic unity of the active hole protection and the hole sealing.

The invention belongs to the technical field of coal seam drilling data monitoring, and particularly relates to a soft coal seam directional long drilling while-drilling CO and temperature monitoring and control system which comprises an acquisition device protection and installation structure used for installing a data acquisition device while drilling and protecting the data acquisition device; the data acquisition and transmission system comprises a data acquisition device and a data transmission system which are connected with each other, the data transmission system is used for transmitting data acquired by the data acquisition device to the ground monitoring system, and the data acquisition device at least comprises a CO sensor and a temperature sensor; the data analysis and processing system is connected with the transmission system, receives, analyzes and processes the data from the data acquisition device, and predicts a data change trend based on the acquired data; the data analysis and processing system calibrates the data acquisition device through an automatic calibration and fault diagnosis module based on the acquired data in the data analysis and processing process; according to the invention, real-time monitoring, trend prediction and intelligent linkage control of CO gas and temperature in the drilling process are realized.