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

The invention relates to a method for large diameter borehole extracting and high-pressure grouting hole sealing, which is characterized in that the method comprises the following steps: at the coal seam top and in the floor roadway rock surface, an across-seam hole drilling and sealing section are constructed in the coal seam; a hole sealing pipe is positioned into the hole sealing stage; a grouting cavity is reserved between the hole sealing pipe and the hole wall of a borehole; a grouting pipe and a return pipe are respectively arranged in the two positions corresponding to the grouting cavity; the output pipe of a high pressure grouting pump communicates with the grouting pipe; grouting material is infused into the grouting cavity by the high pressure grouting pump through the grouting pipe, until the grouting material overflows out of the return pipe; the hole sealing section is formed through maintenance; across-seam hole drilling is constructed in the inner cavity of the hole sealing pipe. The method has the advantages that the hole sealing effect is good, the effective gas extraction time is long, and the construction method is simple.

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 discloses a low permeability coal seam gas pre-drainage method though intensive drilling holes and pipe pressure-up. The method includes the following steps: a plurality of through drilling holes are arranged on a pre-drainage coal seam; a first drainage pipe is laid on one side of an air inlet roadway close to the pre-drainage coal seam, and one ends of the plurality of through drilling holes are connected with the first drainage pipe; a second drainage pipe is laid on one side of an air return roadway close to the pre-drainage coal seam, the other ends of the plurality of through drilling holes are connected with the second drainage pipe so as to enable the plurality of through drilling holes to be communicated with the first drainage pipe and the second drainage pipe respectively to form a gas pre-drainage system, and a first negative pressure boosting pipe system is laid in the air inlet roadway and communicated with the first drainage pipe so as to boost negative pressure of the first drainage pipe; and a second negative pressure boosting pipe system is laid in the air return roadway and communicated with the second drainage pipe so as to boot negative pressure of the second drainage pipe.

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 provides a gas collector comprising an inlet valve, a negative pressure valve and a bottle body. The inlet valve and the negative pressure valve are arranged on the bottle body. The bottle body is provided with a movable component opposite to the negative pressure valve. The movable component and the bottle body are connected together via the flexible seal material. The negative pressure valve and a gas main collecting pipeline are in communication with each other and the negative pressure valve is composed of a negative pressure bulkhead. The movable component is provided with a connecting piece and the connecting piece connects the movable component with the negative pressure bulkhead. The gas enters the bottle body via the inlet valve so as to drive the movable component to move towards one side that is far away from the negative pressure valve. The movable component drives the negative pressure bulkhead to move so as to turn on the negative pressure valve through the connecting piece. In this way, the gas in the bottle body enters the gas main collecting pipeline via the negative pressure valve. The concentration of the gas extracted by the above gas collector is high.

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.

The invention discloses a track varying drilling method and device. Firstly drilling is conducted on a coal bed, then a track varying drilling pipe is inserted into a main drill hole, the front part of the track varying drilling pipe is provided with a tilting guide mechanism, an anchor cable drill of which a drill rod is capable of crooking is arranged in the track varying drilling pipe in a sleeved mode, and tilting drilling is conducted on the side wall of the main drill hole according to the various depths degree to which the track varying drilling pipe penetrates into the main drill hole.On the basis of the main drill hole and through reasonable redrilling by using a track varying drilling device, a drill hole area in which the main drill hole is regarded as a center, and a lateral drill hole is regarded as the radius is finally formed, in this way, a coal body can be loosened, the gas can be extracted, thus the extraction quantity of the gas in the drill hole is increased, and the gas extraction effect in the coal bed can be improved.