6results about How to "Increase extraction concentration" patented technology

The utility model belongs to the technical field of hole drilling and sealing in the gas extraction process, and particularly discloses a hole drilling and sealing grouting supercharging device which comprises two hole sealing bags arranged in a spaced mode, a grouting pipe and a gas extraction pipe penetrate through the two hole sealing bags, and a grouting section is formed between the two hole sealing bags. An explosion valve is arranged on the grouting pipe located in the grouting section, grouting holes communicated with the interior of the hole sealing bag are formed in the grouting pipe, and the front end of the gas extraction pipe extends into the drill hole in the front end of the hole sealing bag at the front end and is provided with an extraction hole; and a limiting mechanism used for limiting the hole sealing bag at the rear end from falling off is arranged in the drill hole at the rear end of the hole sealing bag at the rear end. According to the pressurizing device, after the hole sealing bag blocks a drill hole, the limiting mechanism limits the hole sealing bag at the rear end to fall off, larger grouting pressure can be borne, grouting liquid can smoothly enter small gaps after the pressure is increased, and therefore more compact blocking is achieved, and the gas extraction efficiency and concentration can be effectively improved.

The present invention discloses a drilling device and a drilling method for an underground gas hole. First, a casing hole is drilled in a drainage area, a sealing casing is sealed and fixed at the hole mouth, and then a drilling device is connected to the sealing casing. When drilling, a coolant is pressurized and injected into the borehole through a hollow drill rod to support the hole wall. After the hole in the rock formation section is penetrated, a wall-protecting mud is pressurized and injected into the rock formation to form a certain hydrostatic pressure in the hole, which can stabilize the rock wall. After entering the coal seam, clear water drilling is adopted. Water slag generated during the drilling process is separated by a water slag separation device to realize the secondary utilization of resources. When drilling to the final hole, the drainage pipeline is replaced under the pressurized state in the hole to carry out slow pressure reduction drainage. The slow pressure reduction drainage method can avoid the problem of speed-sensitive effect and blockage of the hole wall gap, reduce the attenuation efficiency of the gas amount in the gas hole, and improve the gas extraction amount.

The present invention discloses a gas extraction intelligent control experimental system and method, comprising an extraction branch pipe subsystem, an extraction main pipe system, a monitoring and control subsystem, a signal analysis and processing subsystem and an extraction management platform. The extraction main pipe system cooperates with the extraction branch pipe subsystem to effectively simulate the influence of coal seam gas extractability and air leakage degree on the adjustment of extraction parameters. At the same time, the opening of each electric regulating valve and the rotation speed of the extraction pump are adjusted by the signal analysis and processing subsystem and the monitoring and control subsystem to achieve the adjustment of gas concentration and pure flow under different working conditions. The extraction management platform takes the maximum gas pure flow of the extraction main pipe as the target to solve and obtain the optimal system operation parameters; by simulating the flow of underground gas in the extraction system, the relationship between system parameters and gas concentration and flow in the pipeline network is clarified, thereby providing data support for the intelligent adjustment of parameters of the underground extraction system to ensure high extraction concentration and low energy consumption.

This invention discloses a deployable fire-operated slotting device, comprising a deployable fire-operated slotting nozzle and a gas pipeline, which are connected by a heat-insulating hose. The fire-operated slotting nozzle includes two parallel semi-circular heat-insulating tubes, the tails of which are connected to the gas pipeline via heat-insulating hoses. A sleeve is provided on the rear half of the semi-circular heat-insulating tubes and the outer side of the heat-insulating hoses. A horizontally arranged pin and steel wire rope are welded inside the sleeve. In the borehole, the fire-operated slotting nozzle moves the sleeve backward by pulling the steel wire rope, releasing the two semi-circular heat-insulating tubes and the heat-insulating hoses from the sleeve's constraint. The two semi-circular heat-insulating tubes unfold under the traction of the spring and the steel wire rope, forming a T-shaped structure. After ignition and with dragging, it can achieve directional fire-operated slotting in the borehole, forming a wider slot, thereby obtaining a larger free surface in the coal seam, reducing drilling volume, and improving pressure relief.

The utility model discloses a bag type two-blocking and one-injecting positioning and section hole sealing device, which is used for forming a closed space in front of a sieve hole of an extraction pipe, and comprises a pressure relief pipe, and a grouting pump, a first one-way valve, a lower bag, an explosion valve, a second one-way valve and an upper bag which are connected in sequence, the first one-way valve, the lower bag, the explosion valve, the second one-way valve and the upper bag are all communicated through a grouting pipe, the closed space is formed between the upper bag and the lower bag, and the closed space is communicated with the open space where the sieve holes are located through the pressure relief pipe. The problem that a closed space cannot be filled with grout through existing hole sealing equipment is solved, the tightness of hole sealing of the bag is guaranteed, the mine gas extraction concentration is improved, and normal promotion of mine safety production work is facilitated.

The invention discloses a pressurized grouting, water filtering and slurry returning hole packer, and particularly belongs to the field of coal mine equipment. The hole packer comprises two double-layer filter cloth bags, a PE (polyethylene) antistatic flame-retardant black grouting pipe, a returned slurry filter pipe and a gas drainage pipe, the two double-layer filtering cloth bags are arranged at the front end and the rear end of the PE anti-static flame-retardant black grouting pipe in a fastened mode, four 8mm grouting holes are formed in the double-layer filtering cloth bags at the front end and the rear end of the PE anti-static flame-retardant black grouting pipe respectively, and one to two internal expansion burst valve grouting holes are formed in the middle section of the PE anti-static flame-retardant black grouting pipe. The rear end of the PE antistatic flame-retardant black grouting pipe is provided with a grouting quick-plug connector in a locking mode. An external pressure explosion valve slurry return hole and dense small holes are formed in the slurry return water filter pipe, and the slurry return water filter pipe is sleeved with a filter cloth cylinder; rubber plugs are plugged at the front ends of the grouting pipe and the slurry returning and filtering pipe; and the gas drainage pipe penetrates through the middle of the double-layer filter cloth bag. According to the device, excessive water and air can be filtered and discharged, viscous high-concentration cement paste is left to fill and seal the drill hole, and coal rock gaps around the drill hole can be filled.