37results about How to "Large amount of extraction" patented technology

The invention relates to a directional hydraulic pressing penetration, permeability increase and outburst elimination method of a guide groove, which comprises the steps of (1) constructing a guide groove drill or the guide groove drill and control drills in a coal seam; (2) forming a guide groove in the guide groove drill in advance; (3) utilizing the guide groove drill or the control drills to perform hydraulic fractures, utilizing the guide groove and the control drills to perform directional control on the hydraulic fractures, enabling the coal body between the guide groove drill or the guide groove drill and the control drills to be pressed into penetration, forming multiple fractures among drills, and enabling a large amount of nickings to be brought out through the high-pressure water; and (4) after the fractures finish, enabling all the drills to be sealed and accessed into a drainage system, and beginning extraction. By means of the method, the number of pressing penetration of drills can be increased by 50%, the pressure relief scope of the coal seam is increased by over one time, the permeability of the coal seam is remarkably improved, gas extraction is increased by more than four times, measure drills can be reduced by about 60%, fore-pumping time is effectively reduced, area outburst elimination is achieved, and gas hazards can be reduced to the largest extent.

The invention relates to a method for cooperatively and progressively extracting coal seam gas based on a U-shaped well and a directional drilled hole. The method comprises the following steps: constructing the U-shaped drilled well on the ground; constructing the long-distance directional drilled hole in a coal seam; arranging a sieving pipe in a coal mine underground drilled hole to enable the U-shaped drilled well to be stereoscopically crossed with the underground long-distance directional drilled hole in a space; then carrying out hole sealing on the long-distance directional drilled hole; along with the tunneling of a gate roadway, continuously constructing the long-distance directional drilled hole to enable the long-distance directional drilled hole to be stereoscopically crossed with the U-shaped drilled well, so as to realize a pattern of pre-extracting the gas and progressively extracting the coal seam gas. The method provided by the invention has the advantages of simple construction process, small working amount and capability of completely replacing underground gas extraction; the investment of a working surface gas extraction pipeline is reduced and the scale of a coal mine gas extraction pump station is reduced; a fracturing construction process is not needed and the investment of a fracturing station and fracturing liquid is reduced; pollution to the fracturing liquid is avoided and the method has extremely high technicality and economical efficiency.

The invention relates to a backflow-prevention anti-blocking drainage device with a large suction amount. The drainage device comprises a liquid inlet valve body (1), a liquid inlet valve core (2), a liquid inlet valve spring (3), an upper valve cover and a lower valve cover (4 and 10), a needle cylinder piston (5), a piston rod (6), a liquid discharging valve body (7), a liquid discharging valve core (8) and a liquid discharging spring (9), wherein the liquid inlet valve core (2) only allowing a liquid to flow downwards is arranged in the liquid inlet valve body (1), and an insertion hole for a liquid inlet pipe (11) is formed in the upper left part of the liquid inlet valve body (1); the liquid discharging valve core (8) only allowing the liquid to flow leftwards is arranged in the liquid discharging valve body (7); and an insertion hole of a liquid discharging pipe (13) and a duct allowing the needle cylinder piston (5) to move leftwards and rightwards are formed in the left side and in the upper right part of the liquid discharging valve body (7) respectively. The needle cylinder piston (5) moves leftwards and rightwards continuously, so that the liquid can be drained and discharged to a container. The backflow-prevention anti-blocking drainage device with a large suction amount has the advantages as follows: smooth drainage is realized, the drainage amount is large, retrograde infection of the liquid is prevented, blocking is avoided, and continuous drainage can be realized.

The invention discloses a piezoelectric pump based on secondary resonance. The piezoelectric pump comprises a first vibrating body, a second vibrating body, a pump cavity and a base, wherein the outer wall of the bottom end of a vibrating pipe is connected with a piezoelectric element to form the first vibrating body; the pump cavity consists of a film, a pump cavity plate, a valve plate, a one-way valve and an inlet and outlet flow orifice plate; the bottom end of the first vibrating body is fixed by the base, and the other end thereof is sleeved and connected with the second vibrating body; the second vibrating body, the film and the pump cavity plate are sequentially connected; the pump cavity plate, the valve plate and the inlet and outlet flow orifice plate are fixedly connected with the base; and an inlet one-way valve part and an outlet one-way valve part are mounted on the valve plate. With the adoption of the technical scheme, the problem that the high frequency characteristic of a piezoelectric sheet and the low frequency characteristic of the one-way valve in the piezoelectric pump are not compatible is solved. In addition, the piezoelectric pump has a recyclable driving structure and a replaceable pump cavity body, so that the cost is reduced, and liquid cross contamination is avoided.