76 results about "Air well" patented technology

A method and structure for shallow-hole ore-retaining and subsequent filling mining with combined mining of inner and outer patios. This method alternately arranges ore chambers and inter-columns along the strike of the ore body, and constructs inner and outer patios on the inter-column in the vein and outside the footwall. The inner patio runs through the whole stage, the height of the outer patio is half of the stage height, and the mining standards of adjacent mine houses are not shared; the body to be mined in the mine house is divided into upper and lower parts vertically. When the lower ore body is mined, personnel, etc. The stope is entered and exited through the in-vein courtyard. When the upper ore body is mined, the stope is entered and exited through the outer-vein courtyard and the upper section of the inner-vein courtyard; the back-air well is arranged at the end of the mine house, and the fresh air flow enters through the inner and outer pedestrian courtyard and stope connection road In the stope, the polluted air is discharged to the upper-stage return air system through the filling return air shaft; compared with the related art, the mining method of the present invention is used to mine the thin ore veins with steep inclination and crushing, which can greatly improve the ore recovery rate, production efficiency and operation safety. Reduce engineering maintenance costs and improve ventilation.

The embodiment of the invention provides a method and device for determining the ultimate sand-discharging occasion of a gas well. The method comprises the steps that basic parameters, gas flowing rates and wellhead oil pressure of the target gas well and a reservoir are obtained; according to the basic parameters, the gas flowing rates and the wellhead oil pressure, the height of accumulated sandin a production pipe column of the target gas well is determined; the first relation between the wellhead oil pressure and the height of the accumulated sand is determined; according to the basic parameters and wellhead static pressure data of the target gas well, the maximum height of the accumulated sand capable of being discharged from the production pipe column under different wellhead staticpressure is determined; according to the maximum height of the accumulated sand and the first relation, the second relation between the maximum height of the accumulated sand and the wellhead oil pressure is determined; and the ultimate sand-discharging occasion of the target gas well is determined according to the second relation. The accuracy of determining the ultimate sand-discharging occasion of the gas well can be improved.

The invention relates to a reverse drilling construction method of a high-gas and outburst-coal-seam fresh air shaft, and belongs to the field of coal mine fresh air shaft construction. The reverse drilling construction method of the high-gas and outburst-coal-seam fresh air shaft comprises the steps of constructing a bearing platform on the earth surface of a fresh air shaft, and arranging a drilling platform; connecting a drill rod with a construction drill bit with a propelling system, a water tail and a pump station; starting drilling from the earth surface, passing through a rock stratum,and penetrating through a coal seam until arriving at a concentrated air return way under a coal mine; unloading the construction drill bit; lowering the drill rod into the concentrated air return way under the coal mine, and connecting with the tapered drill bit; drilling toward the earth surface from the concentrated air return way under the coal mine, lowering the drill rod with the tapered drill bit into the concentrated air return way under the coal mine, unloading the tapered drill bit, and connecting a construction platform with the drill rod; applying a drilling machine to construct gas extraction drilling in the coal seam, connecting the tapered drill bit with the drill rod after the coal seam gas content reaches to an allowable exposed threshold value, and perpendicularly drilling toward the direction of the earth surface until arriving at the earth surface. After a fresh air shaft body is formed, spouting and reinforcing are carried out on the inner part of the fresh air shaft from the underground coal mine to the earth surface.