217 results about "Coring" patented technology

The utility model discloses a broken soft coal bed pneumatic airtight coring device which comprises a coring outer cylinder, a coring drill bit and an adapter. A pressing ball seat is arranged in the adapter, a locking mechanism core pipe is arranged in the lower end of the pressing ball seat in a sleeved mode, and the locking mechanism core pipe is further sleeved with a force storage mechanism body pipe capable of moving in the axial direction. The lower end of the power storage mechanism main body pipe is connected with the coring inner cylinder through a power storage mechanism main body pipe extension section capable of axially moving; a limiting step is arranged on the outer wall of the force storage mechanism body pipe, a locking sliding sleeve is further arranged outside the force storage mechanism body pipe in a sleeving mode, and a force storage spring is further arranged between the limiting step and the locking sliding sleeve in an abutting mode. A locking ball is embedded in the pipe wall of the lower end of the force storage mechanism body pipe and can axially limit the locking sliding sleeve. A sealing ball valve is arranged in the coring inner cylinder, and the pushing cylinder can be pushed by the locking sliding sleeve to move in the axial direction to close the sealing ball valve. The closed coring device solves the problems of hole spraying, hole collapse and the like when an existing closed coring device is used in a broken soft coal seam.

The utility model relates to the technical field of well drilling coring, and discloses an elastic self-driven pressure maintaining coring tool which comprises a shell, a coring drill bit is fixedly arranged at the front end of the shell, an inner barrel and a coring assembly are sequentially and coaxially arranged in the shell, the rear end of the inner barrel is closed and fixedly connected with the shell, and a pressure maintaining device is arranged at the front end of the inner barrel. The coring assembly comprises a main spring, a positioning cylinder, a coring cylinder, a footage rod and a locking device, the main spring is used for providing pulling force towards the rear end of the inner cylinder for the positioning cylinder, one end of the coring cylinder is rotatably connected with the front end of the positioning cylinder, and the locking device is used for limiting the positioning cylinder to move towards the rear end of the inner cylinder; the footage rod penetrates through the front end of the positioning cylinder and is in sliding connection with the positioning cylinder, the footage rod is matched with the locking device, and when the footage rod slides towards the rear end of the positioning cylinder, limiting of the locking device to the position between the positioning cylinder and the inner cylinder can be relieved; according to the tool, the coring barrel can automatically return to the inner barrel when the footage is in place, and pressure-maintaining and fidelity coring of a deep rock stratum can be achieved.

The utility model discloses a geological drilling coring device which comprises a frame body, a placing table is installed on the upper portion of the frame body in a sliding mode, a motor is connected to the upper portion of the placing table through bolts, the motor is connected with a transmission shaft through a belt, a coring barrel is fixedly connected to the bottom of the transmission shaft, and a drill bit is fixedly connected to the bottom of the coring barrel. A cutting-off structure is arranged in the coring barrel and comprises a cavity and a first gear, a sliding block is slidably installed in the cavity, a rack is fixedly installed on the upper portion of the sliding block, a second gear is rotatably installed in the cavity, the second gear is connected with the rack in a meshed mode, and a double-face gear ring is rotatably installed at the upper position in the cavity. The double-face gear ring is connected with the second gear in a meshed mode, the double-face gear ring is connected with the first gear in a meshed mode, and a rotating shaft is fixedly installed at the top of the first gear. According to the geological drilling coring device disclosed by the utility model, a required core sample can be completely stored in the device.

The gas-liquid synergistic anti-drag coring drill bit comprises a drill bit body, bottom inclined atomization holes are evenly distributed in the bottom of the drill bit body, side face tangential air holes are formed in the side face of the drill bit body, a right-handed spiral groove and a straight groove are formed in the peripheral wall of the side edge of the drill bit body, and a ceramic coating coring pipe is arranged in the drill bit body. A top pressure relief hole is formed in the top of the ceramic coating coring pipe, a rubber damping ring is arranged on the periphery of the upper portion of the ceramic coating coring pipe, and a negative pressure dust suction opening is sleeved with the rubber damping ring. According to the gas-liquid synergistic anti-drag coring drill bit for glutenite cultural relic protection drilling, the drilling jamming risk is reduced, the core quality is improved, environmental pollution is inhibited, and energy consumption and thermal damage are optimized.

A cluster down-the-hole hammer (100), comprising: a hammer body (1), the hammer body (1) comprising a hammer frame (11) and a plurality of sub-hammers (12), wherein a first cuttings discharge chamber (111) is defined in an inner side of the hammer frame (11), and penetrates along two axial ends of the hammer body (1), the plurality of sub-hammers (12) are spaced apart on the inner side of the hammer frame (11) in the circumferential direction of the hammer frame (11), each sub-hammer (12) is provided with an impact chamber (121), and a first cuttings discharge channel (113) is further provided between two adjacent sub-hammers (12); drill rods (2), each drill rod (2) comprising a drill frame (21), an air supply pipe (22) and cuttings discharge pipes (23), wherein the drill frames (21) are connected to one axial end of the hammer frame (11), a second cuttings discharge chamber (211) is defined in an inner side of each drill frame (21), and is in communication with the first cuttings discharge chamber (111), the air supply pipes (22) are respectively in communication with the impact chambers (121) of the plurality of sub-hammers (12) so as to supply air to the plurality of impact chambers (121), and the cuttings discharge pipes (23) are in one-to-one correspondence and communication with the first cuttings discharge channels (113); and a coring mechanism (3), the coring mechanism (3) being vertically adjustably arranged in the second cuttings discharge chambers (211), so as to remove rock cuttings from the second cuttings discharge chambers (211).

This invention discloses a core retrieval or recovery tool for drilling, relating to the field of drilling engineering technology. The internal drill string assembly is suspended within the central channel of the external drill string assembly via a centralizer. The lower end of the internal assembly is a retaining spring assembly, and the lower end of the external assembly comprises the drill bit and multiple sliding blocks. One end of each sliding block extends into one end of the drill bit and is suspended by an elastic element. One end of the retaining spring assembly passes through the drill bit and extends between the sliding blocks, with the outer wall of the retaining spring assembly engaging with the inner wall of each sliding block via a bevel. Drilling fluid is introduced into the internal drill string assembly, causing it to move downwards relative to the external assembly. The downward movement of the retaining spring assembly pushes the sliding blocks outwards away from the drill bit's centerline. When the internal drill string assembly resets, the elastic element drives the sliding blocks back towards the drill bit's centerline. This invention improves drill string throughput and prevents the loss of incomplete or fragmented core samples at the drill bit, thereby increasing the core retrieval rate or core recovery rate.

The present application belongs to the technical field of drilling coring device in the technology of oil geological exploration and well drilling, and discloses a borehole wall coring drilling tool suitable for high permeability formation of open hole, which comprises a drill bit, a plurality of chip removal holes are arranged on the side wall of the drill bit at intervals; a drill rod, one end of the drill rod is connected with the drill bit, and a plurality of spiral hollowed-out mud guide grooves are arranged on the rod wall of the drill rod at intervals and close to the drill bit. The spiral hollowed-out mud guide grooves are arranged on the rod wall of the drill rod at intervals and close to the drill bit, so that the scraping function is added to the inner and outer walls of the drill rod, the mud cake on the borehole wall can be shredded, the closed space is destroyed, the mud cake is thrown out of the drill bit by using the rotation characteristics of the drill bit, the mud slurry washes the rock debris and the drill bit, and finally the rock debris is discharged from the chip removal hole, the drilling of the rock core is reduced in resistance, the probability of drill pipe sticking is reduced, and the success rate of coring is improved.

The utility model discloses metal mine geology drilling equipment, which relates to the field of drilling equipment and comprises driving equipment, the driving equipment is mounted on a driving support through a moving frame, a platform is fixedly mounted on the driving support, a mounting part is fixedly mounted at the upper end of the platform, and the mounting part consists of a connecting ring and a mounting plate. The mounting plate is fixedly mounted on the outer wall of the connecting ring, a cleaning part is mounted on the platform, the cleaning part is composed of a mounting round pipe, a limiting insertion block, an anti-falling ring and bristles, the limiting insertion block is fixedly mounted on the outer wall of the mounting round pipe, and the mounting round pipe is fixedly sleeved with the anti-falling ring. The outer wall of the coring drill rod can be automatically cleaned, so that the cleaning burden of workers can be reduced, and the use efficiency of drilling equipment can be improved; and by arranging the mounting piece and the connecting piece, the cleaning piece can be conveniently disassembled and assembled, so that the cleaning piece can be conveniently replaced.

The utility model relates to a vertical hole grinding drill for replacing large-aperture coring in an obstacle breaking area of an underground diaphragm wall, and solves the problems that the underground diaphragm wall is of a high-strength reinforced concrete structure, the drilling diameter is large, the drilling depth is large, and a traditional coring drill bit is insufficient in transmission torque in the process of drilling a construction hole in the underground diaphragm wall. The device comprises a drill bit, a drill rod is connected to the upper portion of the drill bit, the drill bit comprises a connecting section, a sleeve section and a grinding section from top to bottom, a grinding disc is arranged at the bottom of the grinding section, annular teeth are arranged on the circumference of the bottom face of the grinding disc, a plurality of grinding heads are distributed in the middle of the bottom face of the grinding disc, and water injection holes are formed in the positions, at gaps of the grinding heads, of the bottom face of the grinding disc. And an overflow slurry discharging channel is formed between the outer wall of the drill bit and the drill hole. The grinding head is arranged on the grinding disc on the bottom surface of the drill bit and is matched with an annular tooth structure of an original coring sleeve to grind the bottom surface of a drill hole and slowly push the drill hole, so that the drilling construction requirements of large-depth and high-strength materials are met.

The application provides a ball and socket type rope coring drill tool suitable for an audio frequency drilling machine, which comprises an outer pipe assembly for downward drilling and an inner pipe assembly for sampling, the inner pipe is arranged in the hollow inner cavity of the outer pipe, and the top of the inner pipe is provided with a ball and socket mechanism and a fishing spear, the ball and socket mechanism is used for realizing the clamping or separation between the inner pipe assembly and the outer pipe assembly when the inner pipe assembly is moved into position relative to the outer pipe assembly. The whole drill tool has simple structure, high outer pipe thread strength, can achieve waterless drilling, the ball and socket mechanism has accurate positioning, reliable locking and easy unlocking, and the drill tool can improve the comprehensive drilling efficiency and greatly reduce the labor intensity.

The invention discloses a sampling device for engineering geological survey, and relates to the technical field of geological prospecting, the sampling device comprises a rack, the rack is provided with a coring drilling tool and a first driving member, the inner part of the coring drilling tool is detachably connected with an inner cylinder, the inner cylinder is internally provided with a transmission ring, the transmission ring is internally provided with a bracket, and the bracket is internally provided with a second driving member; a plurality of driven wheels are rotationally connected to the support, the first driving part is in transmission connection with the driving wheels, the support is used for limiting the shape and the position of the transmission ring through the driven wheels, the driving wheels are arranged on the outer circumferential wall of the transmission ring, and the driving wheels are used for driving the transmission ring to turn over. A second driving part is further arranged in the inner cylinder and used for driving the driving wheel to rotate, the transmission wheel is used for clamping a rock core, and a storage assembly is further arranged above the transmission ring and used for storing the rock core and reducing collision damage, caused by rock core deviation, of the rock core and the inner pipe.

The present application provides a kind of inner slag discharging device and its slag discharging method, it includes high wear-resistant obturator, drill bit drill rod device, venturi water and drill slag dry-wet separator, the drill bit drill rod device is located in high wear-resistant obturator, drill slag dry-wet separator is connected with drill bit drill rod device by venturi water.The flow direction of drill slag can be changed by changing the running direction of slag discharging medium, so as to reduce the scouring, soaking and friction of slag discharging medium and drill slag on the hole wall, which is beneficial to the formation of drilling hole;It can achieve the purpose of point coring by achieving "falling and discharging simultaneously";Drilling cuttings can be well collected, which is beneficial to the civilized production of construction site and prevents dirtiness and disorder;If inert gas is used for slag discharging during construction, it can also achieve the purpose of inhibiting spontaneous combustion of coal seam.Through the above technical scheme analysis, the device is theoretically feasible and the operation is reliable, which provides good drilling quality for casing, greatly improves the success rate of drilling and casing and the extraction effect.

The utility model relates to the technical field of coal mine drilling coring, in particular to a novel closed coring device. Comprising an outer barrel, a drill bit and a drilling tool connector, the drill bit is located at one end of the outer barrel, the drilling tool connector is located at the other end of the outer barrel, a spear mechanism is installed at the end, away from the drill bit, of the outer barrel, a hanging mechanism is installed in the outer barrel and located at one end of the spear mechanism, and a ball seat is arranged in the outer barrel and located on one side of the hanging mechanism; an inner cylinder is arranged in the outer cylinder and located on one side of the ball seat. According to the novel closed coring device, rope coring is achieved through cooperation of the outer barrel, the drill bit, the spear mechanism, the suspension mechanism, the ball seat and the closed ball valve, after closed coring of a broken soft coal core is completed, other parts except for the outer barrel, the drill bit and a drilling tool connector are directly taken out through the male fishing head, time cost is saved, and working efficiency is improved. And meanwhile, when the coring device is used, core clamping can be effectively avoided, and the sealing reliability is improved.

The invention belongs to the technical field of drilling and coring of road surface coring machines, and discloses an anti-pollution device of a road surface coring machine, the anti-pollution device comprises a splash-proof cylinder and a waste water collector, the splash-proof cylinder and the waste water collector are communicated through a drain pipe; a base is arranged at the bottom of the splash-proof barrel, a movable guide rail is arranged in the center of the middle of the splash-proof barrel, and the coring machine is arranged in the movable guide rail in a sliding mode. The coring machine can slide up and down along the moving track, when the coring machine slides downwards, a coring drill of the coring machine drills and cores on the road surface, cooling lubricating water used in the drilling process and chippings generated by drilling are thrown out by the rotating coring drill, and the chippings enter the waste water collector through the drainage pipe after being collected by the inner wall of the splash-proof barrel. The device has the beneficial effects that the working condition of splashing of waste water and chippings is effectively improved, the subsequent manual cleaning link is reduced, and the working procedure and cost are saved.

The application discloses a polar drilling hole wall directional coring drill, which comprises a shell, an upper hot melting drill bit, a reverse torsion mechanism, a cable chamber, a control system, a hole positioning mechanism, a supporting mechanism, a reaming mechanism and a coring mechanism, wherein the upper hot melting drill bit is assembled at the top of the shell, the reverse torsion mechanism, the cable chamber, the control system, the hole positioning mechanism, the supporting mechanism, the reaming mechanism and the coring mechanism are sequentially assembled in the shell from top to bottom, and the control system is connected with the upper hot melting drill bit, the reverse torsion mechanism, the hole positioning mechanism, the supporting mechanism, the reaming mechanism and the coring mechanism respectively. The application has the advantages that the coring direction can be accurately controlled, the demand of polar scientific research can be met, the drill is provided with the reaming mechanism, the auxiliary time is greatly shortened, the ice core tube can be telescoped to store the ice core in real time, the loss of the ice core is avoided, the drill adopts the modular design, the structure is simple and compact, the burden of polar logistics guarantee is reduced, and the drill is suitable for coring drilling in a harsh environment.

The invention relates to a light-weight pressure-maintaining gas-maintaining coring device for a deep coal mine and a using method, the coring device comprises an outer pipe, a center rod, a core barrel, a pressure-maintaining controller, a clamp spring and a core falling prevention device, the lower end of the outer pipe is connected with a coring drill bit, the lower end of the center rod is connected with the core barrel, and the core falling prevention device and the clamp spring are installed at the lower end of the core barrel; the core falling prevention device is positioned below the clamp spring and above the coring drill bit; the core falling prevention device comprises a plurality of discs arranged in the circumferential direction and an elastic piece used for driving the multiple discs to be folded and closed towards the middle. The core falling prevention device is added, so that the equipment has a core falling prevention function, and when the rock core is broken by the snap spring, the core falling prevention device can effectively prevent a coal sample from falling out of the rock core barrel, and the heart taking rate is increased.

The invention discloses a drilling coring rock core ground processing device and method, and belongs to the technical field of oil and gas drilling, the device comprises a cutting table for cutting an inner cylinder, and is characterized by further comprising a main rack, an auxiliary rack and a hydraulic lifter; the main rack is provided with a slideway, a sliding roller used for supporting an inner cylinder to slide and a righting roller used for righting the inner cylinder, the hydraulic lifters are uniformly arranged on the main rack, the hydraulic lifters are located below the sliding roller, the sliding roller is in sliding connection with the slideway, a supporting frame is in sliding connection with a table top of the main rack, and the supporting frame is in sliding connection with the inner cylinder. A gamma scanner or a cutting machine is arranged on the supporting frame, and the auxiliary rack is connected with the cutting table. Through cooperation of the hydraulic lifters and the sliding rollers, stable lifting and accurate positioning of the core inner cylinder are achieved, the operation stability and safety are effectively improved, then the inner cylinder is cut through the cutting machine, and the coring reliability and stability can be effectively guaranteed.

The utility model discloses a sand coring engineering driller which comprises a coring driller which comprises a mast assembly and a mast base. The stabilizing assembly comprises a first fixing plate, a first hydraulic push rod, a second fixing plate, a second hydraulic push rod, a movable plate, a fourth through hole, a supporting column, a supporting disc and a spring, the first fixing plate is fixed to the side edge of the mast base, the first hydraulic push rod is fixed to the first fixing plate, and the second fixing plate is fixed to the movable end of the first hydraulic push rod. The second hydraulic push rod is fixed to the second fixed plate. The movable plate is fixed to the movable end of the second hydraulic push rod. The utility model solves the problems that the working place of the sand field coring drilling machine is on the beach sand field, the beach sea surface has the characteristics of soft stratum, high water content and the like, and silt at the bottom of a drill hole upwells along with water along with the deepening of the drilling depth, so that the contact part of the mast base and the sand field is loosened, and the mast is unstable.

The application discloses a soft soil bearing capacity testing device, which comprises a main body, the main body comprises a hydraulic driving lifting seat, a driving mechanism is arranged on the lifting seat, a coring drill rod is arranged in the main body, a first positioning groove is arranged in the coring drill rod, a bottom-opened piston barrel is arranged at the top of the coring barrel, a piston is slidably arranged in the piston barrel, the piston is connected with a piston rod, the piston rod penetrates through the top of the piston barrel and is connected with a first positioning mechanism, an overflow valve is arranged on the piston barrel, an extension pipe is arranged on the side of the piston barrel, a detection pipe is movably sleeved on the extension pipe, the end of the detection pipe is sealed by an elastic layer, a displacement sensor and a pressure sensor are fixed in the detection pipe by a support, the detection end of the displacement sensor is connected with the elastic layer, an air / gas inlet pipe is arranged above the detection pipe and communicates with the piston barrel, a one-way valve is arranged on the air / gas inlet pipe, and a first through hole is arranged on the side of the coring drill rod.

This invention relates to the field of core drilling technology in the oil and gas industry, and discloses a continuous coring apparatus. The continuous coring apparatus includes an outer cylinder with connectors and a coring drill bit connected to its upper and lower ends, respectively. The outer cylinder contains a linear motion mechanism and multiple nested inner coring cylinders. The lower end of the outermost inner coring cylinder extends into the coring drill bit. Between adjacent inner coring cylinders, the linear motion mechanism drives the inner inner coring cylinder to move axially along the outer inner coring cylinder. This invention enables continuous coring with a single-cylinder coring operation footage of 20-30 meters or more, improving efficiency by at least 2-3 times compared to existing processes, significantly saving drilling costs and increasing coring efficiency.

The invention discloses a sagger capable of reducing deformation of a ceramic core, which comprises a container main body composed of a bottom plate and at least two rotatable side plates, and the side plates are rotatably connected with the bottom plate; one side of the plate-shaped radiating fin is in vertical contact with the bottom plate, and at least one of the two rotatable side plates is in contact with the plate-shaped radiating fin. The invention also discloses a method for reducing the deformation of the ceramic core. The method comprises the following steps: laying the bottom filler on the container bottom plate; placing products to be sintered and inserting plate-shaped radiating fins between the adjacent products to be sintered; covering the top filler, locking the side plate, sintering and cooling; after sintering is completed, the cooling fins are removed, the side plates are unlocked, the filler is exposed, and the product is taken out. The detachable sagger is combined with the plate-shaped cooling fins, so that the problems that a product is heated unevenly and coring is difficult during sintering of a traditional sagger are solved, and the beneficial effects that the production efficiency is improved, and the sintering qualification rate and the coring qualification rate are increased are achieved.

The invention discloses an in-situ coal seam pressure and heat preservation coring device which comprises an outer pipe assembly and an inner pipe assembly, and the inner pipe assembly is arranged in the outer pipe assembly in a sleeved mode. A gas collecting hole is formed in the top side wall of the outer pipe assembly, a sealing valve is arranged in a bottom inner cavity of the outer pipe assembly, and the bottom end of the spring is higher than the sealing valve; the inner pipe assembly comprises a spearhead, a connecting rod, a power supply assembly, a control assembly, a conductive trigger assembly and a core barrel which are sequentially arranged from top to bottom, an active heat preservation layer is arranged on the outer wall of the core barrel and electrically connected with the conductive trigger assembly, and a sensor is arranged on the bottom face of the conductive trigger assembly; the periphery of the bottom of the core barrel is sleeved with the differential tube, a clamp spring cover is arranged on the outer wall of the bottom end of the core barrel, a clamp is arranged at the bottom of the differential tube and matched with the clamp spring cover, and a spring is arranged between the differential tube and the outer tube assembly. According to the invention, the fidelity effect of a sample and the adaptability of equipment in the coring process are remarkably improved by integrating active heat preservation and passive heat preservation technologies and combining a plurality of innovative technologies such as shock resistance, corrosion resistance and rapid gas measurement.

The utility model discloses a kind of multi-slot coring bits, belong to coring bit technical field, including drill pipe, the bottom end of the drill pipe is provided with sleeve pipe, the outside of the sleeve pipe is sleeved with drill bit body, the side of the drill bit body is provided with multiple cutting edges, arc-shaped overflow passage is arranged between every two adjacent cutting edges, the outside of the cutting edge is fixedly connected with side cutting tooth, the bottom surface of the drill bit body is fixedly connected with multiple lower cutting teeth, the inside of the cutting edge is provided with lower sleeve groove, the sleeve pipe movably sleeve joint to the inner chamber of lower sleeve groove.In the utility model, when drill pipe drives drill bit body to rotate and drills and takes core to stratum, cutting edge, side cutting tooth and lower cutting tooth are used to drill stratum, rock material produced by drilling moves upward along arc-shaped overflow passage, and water discharged by cooperating inner water eye and outer water eye, ensure that rock material can be smoothly moved from the side of drill pipe, and it is good in practicality.

The utility model provides a coring device which comprises a placing table, a connecting plate is arranged in the placing table in a sliding mode, a frame plate is arranged in the connecting plate in a sliding mode, a mounting ring is arranged in the frame plate in a rotating mode through a rotating column, a first motor is arranged in the mounting ring, and an output shaft of the first motor is connected with a coring drill cylinder through a coupler. A first electric push rod is arranged at the upper end of the connecting plate, the telescopic end of the first electric push rod is connected with the upper end of the frame plate, an adjusting mechanism used for adjusting the angle of the coring drill barrel is arranged on the right side of the frame plate, a front-back moving mechanism for driving the coring drill barrel to move front and back is arranged at the lower end of the containing table, and a clamping mechanism is arranged at the upper end of the containing table. According to the coring device, drilling and coring can be carried out on multiple positions of the rock salt mine without releasing a clamping mechanism or manually adjusting the position of the rock salt mine by personnel, the coring speed can be obviously increased, the non-production time is shortened, the manual intervention is reduced, the operation risk is reduced, and the personnel safety is guaranteed.

The pressurizing mechanism comprises a pressurizing inner cylinder, a pressurizing outer cylinder with the upper end arranged outside the pressurizing inner cylinder in a sleeving mode, a steel ball used for axially locking the pressurizing outer cylinder and the pressurizing inner cylinder and an unlocking mechanism used for unlocking axial locking, and the steel ball can be installed in the cylinder wall of the pressurizing inner cylinder and the cylinder wall of the pressurizing outer cylinder at the same time to achieve axial locking; the unlocking mechanism comprises an unlocking sleeve installed in the pressurizing inner cylinder, unlocking is achieved by enabling the unlocking sleeve to slide downwards relative to the pressurizing inner cylinder, and when the unlocking sleeve is located at an unlocking position, the steel ball retreats from the cylinder wall of the pressurizing outer cylinder and is installed in the unlocking sleeve and the cylinder wall of the pressurizing inner cylinder at the same time, so that axial locking is relieved; when the axial locking is released, the pressurizing outer barrel can move downwards from the first position to the second position relative to the pressurizing inner barrel. Unlocking is achieved through sliding of the unlocking sleeve, and fixing is safer than pure pin fixing; according to the pressurizing mechanism, the two-way movement action that the core catcher is pressed downwards for core cutting and the core cabin is pulled upwards for pressure maintaining can be achieved.

The invention discloses a pressure-maintaining coring method for a fragile coal seam, and relates to the technical field of pressure-maintaining coring, and the pressure-maintaining coring method comprises the following steps: S1, assembling a coring drill bit, and lowering the coring drill bit to a position L1 above a coring target layer; s2, a coring drill bit is lowered to the position L2, L1gt, above a coring target layer; l2, observing the hanging load change, judging the shaft bottom condition and cleaning the shaft bottom; s3, short-distance tripping is conducted, and the stability of the well wall is judged; s4, coring drilling is conducted according to preset drilling parameters, process parameters are recorded in the process, and drilling parameters are adjusted according to the process parameters; and S5, after coring is completed, core cutting is conducted, and the sample is pulled out to be recycled. The method achieves the purpose of avoiding low coring efficiency and poor sample quality caused by sand setting and chipping interference in the fragile coal seam in the coring process.

The invention discloses a peristaltic blue ice mechanical coring drilling tool which comprises a cable terminal, an anti-twisting system, a drilling system, a coring system and a control system, and the cable terminal, the anti-twisting system, the drilling system and the coring system are sequentially connected from top to bottom. An armored cable arranged in the cable terminal provides power for the anti-twisting system, the drilling system and the coring system, and the control system is assembled on the ground surface and controls work of the anti-twisting system, the drilling system and the coring system through the armored cable. The anti-twisting device has the beneficial effect of better anti-twisting effect. Faults caused by the tensile problem of the armored cable are avoided, the overall reliability of the drilling tool is effectively improved, and the service life of the drilling tool is effectively prolonged. In the aspect of solving the problem that the drilling tool is stuck, the resistance wire is arranged in the spiral strip, when the drilling tool is stuck, the control system controls the resistance wire to be powered on and heat to conduct hot melting, surrounding ice chips are melted, and therefore recovery of the drilling tool is achieved, and compared with a traditional drilling tool, the drilling tool is safer.

The invention discloses a deep hole closed coring device and method, and relates to the technical field of deep hole closed coring, the device comprises an outer pipe, a first inner pipe and a second inner pipe arranged in the outer pipe, and an inner drill bit inserted in the second inner pipe; a blocking mechanism for blocking a coal core is arranged between the first inner pipe and the second inner pipe, a limiting mechanism for limiting the movement of the inner drill bit is arranged on the second inner pipe, and an analysis device for sampling is arranged at the tail part of the first inner pipe; through hydraulic driving, the second piston and the first piston are sequentially pushed to move, the pin is controlled to retreat from the limiting hole so as to relieve locking of the inner drill bit, the ball core is driven to rotate so as to block a coal core channel, and automatic control over the whole process of drilling, sampling and sealing is achieved; the device has the beneficial effects that the device has the advantages of being compact in structure, reliable in sealing, simple and convenient to operate and capable of continuously sampling, and is suitable for accurate sampling and analysis of deep-hole coal bed gas.

The invention discloses an intelligent drilling and coring tool, belongs to the technical field of oil and gas drilling engineering, and aims to solve the problems of low efficiency, high cost and poor function switching reliability caused by the fact that a tool needs to be replaced by tripping for many times during operation of the same well section. An underground pressure signal is triggered by throwing a plugging ball, an intelligent control module automatically controls a motor to drive a cutting composite tooth piece to be opened and closed so as to achieve function switching, when the tooth piece is closed, drilling teeth on the tooth piece cooperate with a drill bit to achieve comprehensive drilling, and after the tooth piece is opened and withdrawn in the radial direction, the drill bit independently conducts annular cutting. According to the intelligent drilling and coring device, through the integrated design and intelligent electric control switching, the tripping process is omitted, the operation efficiency and the rock core harvesting reliability are remarkably improved, and automation and intelligentization of drilling and coring operation are achieved.

The invention relates to the technical field of coal mine drilling, and discloses a coal rock drilling and sampling integrated sealed sampling drilling tool capable of freely shrinking a drill bit, which comprises an inner-layer drill bit, an outer-layer drill bit, a drill rod, a sleeve, a hydraulic shrinking device and a coring pipe which are tightly connected through a helical tooth-feather key composite device, during drilling, the inner-layer drill bit and the outer-layer drill bit drill forwards together, when a specified distance is reached, the inner-layer drill bit shrinks backwards by utilizing a hydraulic shrinkage system, after the inner-layer drill bit retreats to a specified position, the outer-layer drill bit continues to drill, and a sample enters a coring pipe reserved after shrinkage. According to the device, efficient coring of a coal seam is achieved through collaborative operation of the inner-layer drill bit and the outer-layer drill bit and an intelligent shrinkage control mechanism, the inner-layer drill bit and the outer-layer drill bit are tightly nested through a helical tooth-feather key composite guide mechanism, radial displacement is limited and the inner-layer drill bit is allowed to slide in the axial direction through the meshing design of a helical tooth ring and a feather key groove, and during drilling, the inner-layer drill bit and the outer-layer drill bit synchronously rotate; the hard alloy cutting teeth crush the coal seam, and coal slag is discharged through the spiral slag discharging groove.