32results about How to "Reduce drilling workload" patented technology

The invention relates to coalbed gas mining technology, in particular to a method for extracting coalbed gases from coal mines by upper and lower combination. The method solves the problem of poor gas drainage effects through surface well drilling and hole drilling in the coalbed. The method comprises the following steps: constructing extraction drilled wells on the surface, constructing underground directional long drilled holes in the coalbed, crosslinking the fracture areas of the extraction drilled wells with the drainage areas of the underground directional long drilled holes, then effectively sealing the underground directional long drilled holes in the coalbed, then utilizing fracturing equipment on the surface to fracture the drainage areas drilled on the surface and the drainage areas of the long drilled holes in the coalbed via the extraction drilled wells and finally carrying out extraction. The method has the advantages of improving the extraction rate and efficiency of the coalbed gases and shortening the construction period of the coalbed gas extraction engineering.

The invention relates to a method for gas extraction through a bedding directional long drill hole traversing working face in a broken and soft coal seam. According to the method, through an air screwmotor directional drilling technology, the bedding gas extraction long drill hole is constructed in a tunneled roadway on one side of the working face of the coal seam, and the drill holes penetratesthrough a to-be-tunneled roadway on the other side of the working face to the position, within the control range of 15-20 m, of the outer side of the roadway; and after the drill hole is completed, adrill tool is lifted up, an open-close type guiding drill bit and a drill rod with a large through hole are put down, then a hole protection screen pipe is put down through the center of the drill rod, then the drill rod is lifted up, the screen pipe stays in the hole, and then a gas extraction pipeline is connected for gas pre-extraction. An air screw motor directional drilling method is adoptedin the gas treatment technology so that the drilling depth of bedding extraction of the broken and soft coal seam and the coal seam drilling-encounter rate can be greatly increased, invalid footagesare reduced in quantity, meanwhile the drill hole coverage range is ensured, the purpose of gas pre-extraction outburst elimination of the stope face and the to-be-tunneled roadway is achieved, and safe tunneling of the coal seam roadway and safe extraction of coal extraction work face are ensured.

The invention relates to a method for extracting coal bed methane through down-hole bedding long borehole consecutive cave building and a hydraulic mechanical drill with the diameter changed and enlarged while drilling. A coal bed bedding long borehole is combined with a cave building technology, and the permeability of low-permeable coal reservoirs and the coal bed borehole extraction capacity are improved. A hole is opened at 1/3 coal thickness or 1.5m upwards away from the coal heading floor on the extracting drill site coal wall of an underground coal mine along with the coal bed, the hydraulic mechanical drill with the diameter changed and enlarged while drilling performs cave building on the borehole from inside to outside successively after the borehole reaches the preset depth, and the cave diameters and distances can be calculated through formulas. Coal bed stresses around the cave are released and coal bed prior cracks are widened and lengthened after the caves are completed, tensional and shear failures occur to the coal bed, novel cracks are produced, and accordingly, the coal bed crack connectivity is increased, the permeability is improved, the coal bed methane can be depressurized and desorbed rapidly, the coal bed methane extracting efficiency is improved dramatically, and the coal bed methane extracting time is shortened.

The invention relates to a coal bed gas exploiting technique, in particular to a process for pumping and exploiting coal bed gas by together using ground well drilling and underground hole drilling, solving the problem of low efficiency of the traditional method for pumping and exploiting the coal bed gas. The process comprises the following steps of: (1) carrying out well drilling on the ground; (2) carrying out long hole drilling in underground coal beds; (3) making drilled holes and ground drilled wells crosslink and communicate in the appointed points by utilizing an orientation technique of a long hole drilling machine; (4) effectively closing the underground long drilled holes; (5) fracturing the ground drilled wells and the underground long drilled holes by utilizing fracturing equipment on the ground; (6) after fracturing, closing the ground drilled wells; and (7) opening the closed ends of the underground long drilled holes and then installing relevant pumping and discharging pipelines connected with underground pumping and discharging systems. The process improves the pumping and exploiting speed and efficiency of the coal bed gas, shortens the construction period of coal bed gas pumping and exploiting engineering and saves the construction investment of the coal bed gas pumping and exploiting engineering.

The invention discloses a high-unloading slot composite-incision demolition blasting method for a reinforced concrete cooling tower, and relates to a demolition blasting method for the reinforced concrete cooling tower. The demolition blasting method comprises the following steps: pre-demolishing an internal sprinkling platform and an external ladder of the reinforced concrete cooling tower to be demolished by blasting; arranging a composite blasting incision including a rectangular herringbone pillar area, a trapezoidal ring beam area, an acute triangular directional window and a high unloading slot on the lower part of the tower body, wherein the high unloading slot and the directional window are mechanically arranged so as to ensure the construction precision; drilling at the herringbone pillar and a ring beam which is locally required to be loosened by blasting (a ring beam loosening area is constructed by a mechanical method and a blasting method), filling explosive, fencing, and strengthening blasting of a millisecond delay blasting network through non-electric bidirectional multi-point excitation. By the demolition blasting method, the falling direction can be accurately controlled, the number of boreholes and the amount of the explosive can be greatly reduced, the collapsing disintegration degree and the touchdown impact state of the tower body can be regulated and controlled, and the touchdown vibration can be effectively controlled.

The invention provides a drainage method of tunnel bedrock groundwater. The method includes: adopting a first drilling tool to drill at the position close to a tunnel entrance for opening a drainage channel along the extension direction of the tunnel; when the length of the drainage channel reaches the first preset position, adopting disposal measures, and then adopting a second drilling tool to continue drilling along the drilling direction of the drainage channel till the length of the drainage channel reaches the second preset position; extracting air in the drainage channel to enable negative pressure to be formed in the drainage channel, and enabling water in the drainage channel to be drained. Drainage range of the drainage channel is enlarged to the largest degree, workload of drilling is reduced, influence caused on travelling cranes is avoided, groundwater can be drained effectively or water pressure can be reduced effectively, and water disasters are reduced.

The invention discloses a blasting cutting device with a composite charging structure and a construction method of the blasting cutting device. The blasting cutting device is composed of a shaped blasting tube, a tail connector, explosives, a detonating cord and a reverse detonating cartridge, wherein the shaped blasting tube comprises an explosive groove with a horn-shaped groove and an outer buckling explosive groove cover; a tube is filled with the explosives and is provided with the detonating cord; the reverse detonating cartridge can be connected with the tail of the tube through the tail connector, and therefore the blasting cutting device is formed; and the blasting cutting device is fixed in a blasting hole by a positioning block. According to the horn-shaped groove in the shapedexplosive tube, the charging structure of the horn-shaped groove can generate higher jet velocity than the charging structure of a cone-angle-shaped groove, and the cutting ability on rock mass is higher. The shaped blasting tube has two types including a common type and a reinforced type. A groove of the common type shaped blasting tube is an opening, a groove notch of the reinforced type shapedblasting tube is closed, a shaped cavity is formed in the groove, on the one hand, the rigidity of the structure can be enhanced, on the other hand, after water is injected into the shaped cavity, high-pressure jet water can be generated during blasting to form a water jet, the cutting ability on the rock mass can be enhanced, and the generated water mist can further play a role in dust removal.

The invention discloses a jacking-type arc-shaped steel plate external-prestressing steel rope diverter which comprises a supporting system and a reinforcing system. The supporting system is composed of a supporting plate, an arc-shaped steel plate, multiple connecting plates and a cavity sealing plate, the top face of the supporting system is the supporting plate of a rectangular structure, the top face of the supporting plate is jacked on the bottom face of a beam, the arc-shaped steel plate is arranged on the bottom face of the supporting plate, one end of the arc-shaped steel plate is in welded connection with the supporting plate, an internal cavity is formed between the supporting plate and the arc-shaped steel plate, the connecting plates are arranged in the internal cavity, the cavity sealing plate is arranged at the other end of the supporting plate, the bottom face of the arc-shaped steel plate receives steering bearing pressure of an external steel rope, the reinforcing system is composed of beam-side clamping plates and reinforcing plates which are symmetrically arranged on two sides of the beam, and the beam-side clamping plates and the reinforcing plates are connected on the top face of the supporting plate, and used for connecting the diverter with the beam and improving rigidity of the supporting system. The jacking-type arc-shaped steel plate external-prestressing steel rope diverter is safe, reliable and large in turning radius, the steel rope and the diverter are maintained to be in tangential attachment, and convenience is brought to mounting.

The invention discloses a ship anchor bolt installation scribing method which comprises the steps that a first datum line is scribed on a deck in advance in the captain direction or the ship width direction of a ship, then a second datum line is scribed at a distance of n references from the first datum line, the distance between the first datum line and the second datum line is measured and compared with design requirements, the second datum line is determined if the condition is met, and the position of the second datum line is adjusted if the condition is not met; and finally, a following third datum line is scribed to the x <the> datum line according to the method, so that the datum lines are scribed correspondingly in the captain direction and the ship width of the ship, and small grids are equally scribed according to the distance between every two adjacent datum lines to determine the forming position of anchor bolt mounting holes. Position errors of structural parts generate onthe deck during the assembly process of the ship can be dispersed into each large grid, and the small grids are scribed by evenly dividing the large grids, so that the errors are divided and digestedby each small grid divided on the deck.

The invention discloses an energy-gathering hydraulic-control blasting cartridge. The energy-gathering hydraulic-control blasting cartridge comprises a cylindrical cartridge body and an outer packaging bag and is characterized in that arc-shaped faces are symmetrically arranged in the cartridge body, and the arc-shaped faces sequentially separate the interior of the cartridge body into a first energy gathering cavity, a dynamite cavity and a second energy gathering cavity. The energy-gathering hydraulic-control blasting cartridge has the advantages that high-pressure hydraulic jet and water wedge effect is increased by energy-gathering hydraulic-control blasting, the effects of smooth blasting or presplitting blasting are increased, dynamite use amount is reduced, blasting drilling interval is increased, drilling workload is reduced, and water mist and steam are formed during blasting to suppress dust and improve the operation environment.

The invention provides a fire prevention and extinguishing linear glue injection method. The method comprises the following steps of: determining a spontaneous combustion position according to spontaneous combustion information; determining a construction position and a drilling direction of a drill hole, a plurality of glue injection positions in the drilling direction and corresponding glue injection amounts at the glue injection positions according to the spontaneous combustion position; obtaining the drill hole through construction; mounting a glue injection sleeve with a glue injection end on the drill hole; moving the glue injection end to the glue injection positions respectively; and injecting glue. According to the fire prevention and extinguishing linear glue injection method, the glue is injected at the glue injection positions in the drilling direction, so that the glue can directly cover and extinguish an ignition point, or a glue isolation belt is formed at an estimated position of the ignition point and near the estimated position, and furthermore, oxygen near the ignition point is reduced, and the aim of suffocating the ignition point is realized. The linear glue isolation belt can be formed by only operating one drill hole, so that the problem of low efficiency in fire prevention and extinguishing treatment in a point type glue injection manner in the prior artcan be solved.