76 results about "Air well" patented technology

The invention discloses a method for utilizing a goaf as a total return air well of a mine. The method comprises steps of selecting an available goaf and filling each stope goaf therein for a metal mine of underground mining of an very thin ore body, a thin ore body or a medium-thick ore body which are steeply-inclined, safely treating a passage therein, and subjecting surrounding passages communicating with the passage to anti-leakage treatment; communicating the middle gallery of the lower end of the goaf with a centralized return air well of a lower mining ore body, taking the middle gallery of the upper end of the selected goaf as a total return air well, and gathering all or part of return air of polluted air of the lower to-be-mined ore body to a total return air gallery via a stoperaise in the goaf for being discharged to the ground. The goaf passage is used as the total return air well or the newly added total return air well. While improving the mine ventilation system, the mine without the special total return air well is not required for digging a special return air well, so that the mine of the small special return air well section does not need to expand the section of the special return air well, which greatly reduces the cost of mining.

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.

A mining method for downward cementing and filling without top pillars in combined sections and stopes: the stope layout is divided into two side-by-side stopes according to the middle section; in the quasi-cutting project, the raised shaft is directly connected to the two middle sections of the well at one time , a raised well controls the left and right stopes; the cutting roadway lowers the height of the filling body by one layer compared with the conveying vein roadway, and eliminates the original top pillar; the mining process adopts the approach type downward mining, and the mining operation is in the upper layer of filling Under the body, it is supported by anchor nets on the upper wall; the ventilation support project uses the ventilation shaft along the road to return air, and the pipe-slit anchor rod combined with steel mesh is used to support the upper wall; the filling project reserves pedestrian wells along the road, along the road Ventilation shafts, end-side shafts; the mining method of the present invention has the advantages of low dilution loss rate, simple construction technology, small construction work volume, good ventilation in the stope, high safety, and low mining cost, and is suitable for weak, broken, and steep slopes. Thin vein mining offers an excellent solution.

The invention discloses a goaf buried pipe cold water cooling and nitrogen injection system, comprising an industrial chiller and a water inlet pipeline, the water inlet pipeline is connected to the industrial chiller through a three-way valve, and the three-way valve is a The other end of the ground nitrogen generator is connected to the ground nitrogen generator. The water inlet pipeline passes through the auxiliary shaft, the mine transportation alley, the pedestrian air inlet inclined alley, the transportation uphill and the section transportation alley, and the end of the water inlet pipe passes through a three-way The second valve is connected with a U-shaped pipeline group. The U-shaped pipeline group is composed of a plurality of U-shaped single pipes in series. A safety valve is installed in the U-shaped single pipe, and a return valve is installed at the return water end. The return water valve is connected with the return water pipeline, and the return water pipeline passes through the section return air lane, the return air uphill, the return air alley and the return air well in turn, and the end of the return water pipeline is connected with the hot water utilization device , A water pump is provided between the return water pipeline and the hot water utilization device, and the hot water utilization device communicates with the industrial chiller.

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.

The invention relates to the technical field of building ventilation, and aims to provide a socket-type air pipe connection fixture, including a connecting piece, the connecting piece includes a connecting pipe and a limiting strip, and the limiting strip is arranged on the outer wall of the connecting pipe , the two ends of the connecting pipe are respectively located in the adjacent air pipe, the connecting pipe and the air pipe are in interference fit, and the adjacent air pipe is located on both sides of the limit bar. When installing the air duct, the present invention can make the installation efficiency of the air duct higher, and does not need to leave a construction space for workers to install bolts and nuts between the side wall of the civil air shaft and each side wall of the air duct, and can make The air duct requires less installation space.

The present invention relates to a method for calculating the amount of sand settling at the bottom of a well during the drilling and production of marine natural gas hydrate. The solid-state equivalent volume flow Q of the volume flow of natural gas returned from the empty wellhead hyd1 (t); step 3, calculate the solid-state equivalent volume flow rate Q of natural gas completely decomposed by the hydrate particles returned from the annular wellhead hyd2 (t); step 4, calculate the gas hydrate solid equivalent volume flow rate Q in the process of drilling and production hyd (t); step 5, calculate the volume rate Q of mud sand contained in the wellbore annulus s (t); Step 6, calculating the bottom-hole sand settlement rate Q ss (t); Step 7, calculating the bottom sand volume V ss (t), that is, the amount of sand at the bottom of the well at the specified mining time. The invention can conveniently calculate the bottom-hole sand sedimentation amount of the marine natural gas hydrate layer during the jet fragmentation process under the on-site construction conditions, so as to provide a basis for safe drilling and avoid safety accidents.