Method to prepare water-logged gas saturated massif of rocks to mining by underground method

FIELD: mining.

SUBSTANCE: for realisation of the method, drainage-degassing wells are drilled in zones of higher cracking outside the limits of the prepared mine. Wells are drilled in the bottom-up direction in the close proximity to the profile of the prepared mine. Pumping of gas saturated drainage brines is carried out until the level of the depression curve is set below the horizon of breaking works, and it is maintained at this level for the entire period of mining. Besides, in process of wells drilling the minimum permissible distance to the profile of the prepared mine is accepted as 0.035 m per each running metre of the well.

EFFECT: method makes it possible to increase safety of underground mining works due to reduce amount of arriving fuel gas and natural waters to mines from deep and deposit-adjacent horizons of earth interior.

2 cl, 2 dwg

 

The invention relates to the mining industry and can be used for preliminary degassing watered host rocks for the safe conduct underground mining when mining deposits in particularly difficult conditions on gas.

There is a method of pre-drainage field (RF patent 2027022, BI No. 2 from 20.01.95, E21F 16/00), including the allocation of tectonically active blocks, which define the stress state of the rock mass, drilling dewatering wells in unloaded areas of the massif and pumping water to the surface.

The disadvantage of this method is that it is not intended for the abstraction of water, enriched with explosive gases, which makes it inapplicable in the mines, hazardous gas.

The closest in technical essence and essential features is the way degassing reservoir-satellites (A.S. USSR №1749481, E21F 7/00, publ. BI. No. 27 of 23.07.1992), including the definition of occurrence above magazinemore layer of the aquifer, drilling to the maintenance of the treatment works counter-directional wells of development workings in contiguous layers, with the bottom hole above todopoderoso layer of the aquifer, successive portions of the diversion of water from the wells of the underlying mine workings, and the exhaust gas from Veseli the overall production and disposal rolled back underground fluids. Each portion of the drainage is terminated by increasing the flow rate of gas in the well of the greater workings and renew drainage after the fall of the rate of flow in it.

The disadvantage of this method is that it is focused on the decontamination of layers, occurring in isolation from Vodootvodny horizons, resulting for degassing reservoir used water is not saturated with flammable gases. Groundwater is used only as a tool for hydraulic expansion of the network of cracks, and extrusion gases from the rocks. In addition, the bypass water and gases through wells drilled from the lower workings, provides the preparatory work leading to unnecessarily high operating and capital costs.

The aim of the invention is to improve the safety of underground mining operations by reducing the amount of fuel gas and natural waters in the excavation of deep and adjacent to the mine horizons of the earth's interior while reducing operational and capital expenditures

This objective is achieved in that in the method of preparing water-cut gas-saturated rock to the development of underground mining, including drilling drainage degasification wells before treatment works, pumping of underground fluids and their disposal, Urania wells is carried out in the downward direction in the zone of increased fracturing outside the prepared excavation, in close proximity to her profile, keep pumping out the gas-saturated brine drainage to establish the level of depression of the curve below the horizon cleaning work and support levels for the entire period of testing, and during drilling the minimum allowable distance to the track prepared excavation is the rate of a 0.035 m for every meter of the well.

Drilling in the downward direction in the zone of increased fracturing in close proximity to the profile prepared excavation, allows you to maximize the degassing capacity of the array. This is because, for example, for a tube of Successful major influx of gas-saturated fluids associated with kimberlygonzales faults of the North-East, which are the areas most ancient tectonic structures, covered with permafrost, which modulatoare. The most popular of the underground hydrosphere district are hydrocarbon gases with concentrations up to 1.1 m3/m3(average - 0.6 m3/m3). The share of methane in them is 75-85%, the concentration of heavy hydrocarbons increase to 1.9 to 10.0%, hydrogen 0,31-1,2%.

The gas component of the underground Geosphere district is divided into three deportment of free, adsorbed and rest is accidental. The major part of the gases (95-98%) is in the dissolved form in water in the hydrate accumulations horizons. The total content of adsorbed and free gas in the rocks of the deposits varies from a few tens up to 7000-8000 cm3/kg. And the content of sorbed gases, as a rule, higher than free, but they affect the atmosphere of the mine workings only in the period of its sinking. The value of saturation of the rock is closely linked with its tectonic faulting, i.e. migration of gases from depth intervals of space mining. Therefore, when creating perturbations of the hydrodynamic system the most mobile of its phase - gas emanations submitted with underground brines to the surface. This allows to improve the safety of underground mining operations.

This well should be for the project boundaries prepare workings to prevent penetration enriched gas natural brines from the cavity wells in the underground mine. This is achieved by the fact that the probable deviation of the wellbore 2°, the minimum allowable distance between the project boundaries of production and wellbore in terms of accepted based 0,035 m for each linear foot of well depth corresponding to the depth of the workings regarding regarding the labels drilling. Thus, for example, drainage and degasification borehole that intersects the horizon elaborate on the drilling depth 100 m shall be placed no closer than 3.5 m from the project boundary output.

When pumping gas saturated brine drainage occurs indignation hydrodynamic system, vodokanalnyh layers occurs depression, which ensures the inflow of the main part of the dissolved gases to the point of disturbance (dewatering wells), characterized by minimal pressure. A tiny part of the dissolved gases, signaled and slipped on the dried cracks in the space of a generation, will not have a significant impact on the composition of the atmosphere of underground structures. Therefore, the pre-pumping water from wells outside the mining that will lead to effective degassing of the array and to the interception of the gas-saturated fluids from adjacent areas within the depression funnel that will allow 95 - 98% decrease asopricor in mining production.

The proposed method for the preparation of water-cut gas-saturated arrays will reduce in relation to the known technical solutions capital and operating costs by eliminating the construction of the underground complex drainage excavations, pipe rods, pump, degassing equipment for removal of water and gas.

The method illustrated by figures 1 and 2. Figure 1 presents : scheme of rock masses containing the field Tr. Successful; figure 2 - scheme of degassing a rock during drilling spiral Congress of mine "Good", where:

1 - tube "Successful";

2 - low permeable zone of the October break;

3, 4, 5 - zone srednekamennogo aquifer with a permeability of 6, 20 and 2 m3/day, respectively;

6 - quarry tube "Successful" at the end of testing in an open way;

7 - static pressure water level;

8 - confining bed (impermeable layer);

9, 10, 11 - zone lower Cambrian aquifer with a permeability of 30, 50 and 0.3 m3/day, respectively

12 is constructed without prior degassing portion inclined exit;

13 - under construction part inclined exit

14, 15, 16, 17 - drainage-degasification wells;

18 - the position of the depression curve at the end of mining in an open way (prior to the preparation of gas-saturated array);

19 - the position of the depression curve for the entire period of construction the inclined exit 13.

Specific example

According to the results of the analysis of the hydrogeological situation in the area of the mine field : develop a detailed schematization of rock masses containing the field, taking into account the page is churna-tectonic factor, with the allocation in the plan and transect zones with low and high hydrodynamic parameters and floodprotection, which determines the arrival rate of combustible hydrocarbon gases vertically and laterally in the underground workings (figure 1).

1. Determine the time and place of opening workings of an inclined exit 13 zones, hazardous Russolo and signs of gas, based on the analysis of project plans sinking revealing the workings in the interval of the main aquifer. Mark in terms of the location of wells in zones of increased fracturing (most perforating fluid) in close proximity to the planned profile to the penetration part 13 construction of an inclined exit at the minimum acceptable distance, which is based 0,035 m for every meter of the borehole to achieve its horizon output.

2. According to the scheme of laying (see item 1) Sabouraud drainage degasification wells in the perforating fluid zone: from the surface 14, of the goaf career 15, from the portal of the tunnel sloped exit 16 and with special cameras overlying underground workings 17 (figure 2).

3. Well, lined at the top, will be equipped with submersible pumps, pressure sensors, and an insulated pipeline and rapid means of gas control according to the requirements of the m safety. The depth of the wells, as well as the thickness and composition of udachnogo equipment : each zone is calculated taking into account its size, rate of penetration openings, the interference created by the wells of depression funnels, etc. Projected volumes of brines pumped from wells 14, 15, 16 and 17 will be 50, 40, 45 and 30 m3/h respectively. Gas factor water Srednekamennogo aquifer - 0.6 m3/m3.

4. The time of drainage to create a depression required for dewatering and degassing of, was determined by the formula (BV Borawski, astray freight Samsonov, Lsadmin. The methods for determining the parameters of aquifers by pumping-out data. M., "Nedra", 1979, p.9)

t02,5r2a,

where

r is the distance from wells, m;

a is the coefficient piezoconductivity, m2/day,

that was 2-3 months before the sinking of generation 13. So for 2 months I started pumping gas saturated brine drainage simultaneously on all wells to the extent indicated above.

As a result of this training (pumping) depression curve 18 formed in the moment of testing career degraded to the elevations 19, which lower the workings construction of an inclined exit 13.

Reached as a result of pre-drainage position of the depression curve 19 is supported in a stable condition throughout the construction period and operation openings 13 through periodic pumping of gas-saturated brine drainage. Monitoring the efficiency of dewatering and degassing is carried out by reading from the pressure sensors, which are equipped with all of the well. Retrieved brines rise to the surface and disposed of in accordance with the project Kingsom landfill disposal.

Further, at the subsequent stages of mine development, as the development of wastewater treatment works, train the following construction of underground workings by further deepening depression cones with additional drainage degasification wells.

The proposed method has significantly reduced the flow of hydrocarbon gases, most of which came in the underground workings of the brine aquifers. Residual inflows in developing free and adsorbed hydrocarbon gases are continuously monitored by automatic gas control. In case of exceeding the permissible level of flow of combustible gases defined by the capabilities of the applied scheme of ventilation in the specified schema are provided outside the giving adjustments.

1. The method of preparation of water-cut gas-saturated rock to the development of underground mining, including drilling drainage degasification wells before treatment works, pumping of underground fluids and their disposal, characterized in that the drilling is carried out in the downward direction in the zone of increased fracturing and permeability outside the prepared excavation in close proximity to her profile, perform the pumping of gas-saturated brine drainage to establish the level of depression of the curve below the horizon cleaning work and support levels for the entire period of testing.

2. The method according to claim 1, characterized in that during drilling the minimum allowable distance to profile prepared excavation is the rate of a 0.035 m for every meter of the borehole.



 

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EFFECT: application of the method considerably reduces costs, makes it possible to considerably increase speed of tunnelling and increases efficiency of production.

21 cl, 10 dwg

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