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)



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.


Same patents:

FIELD: mining.

SUBSTANCE: method to degas coal-bearing series includes construction of a drainage mine along an extraction pillar in the coal-bearing guiding bed at the distance from the mined bed before start of construction of developing entries on the protected bed, using it as a degassing pipeline, which is ventilated separately. At the same time the drainage mine is constructed along the geometrically upper guiding bed in the area limited with fracture lines directed at the side of the protected bed, and it is ventilated due to depression pulled by the fan of local ventilation. Besides, jointly with construction of drainage mains the lower guiding bed is mined, which lies at the distance of not more than S along the normal line from the mined bed, determined by the given mathematical expression. Afterwards the coal bed is mined.

EFFECT: increased extent of methane extraction and reduced duration of degassing.

5 cl, 3 dwg

FIELD: oil and gas industry.

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EFFECT: increase of permeability and gas recovery of methane-containing outburst-prone coal beds, reduction and uniform distribution of stresses in them, intensification of coal production.

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FIELD: mining.

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EFFECT: increased area of gas release and reduced time of degassing works.

3 dwg

FIELD: mining.

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EFFECT: increase of coal bed degassing efficiency, reduction of labour costs.

FIELD: mining.

SUBSTANCE: method involves drilling of through holes in coal massif from outpost workings parallel to working face; cutting of initiating slots on walls of the above holes, their sealing and formation of coal hydraulic fracturing cracks by supplying the fluid to them. Besides, cutting of the next initiating slot is performed simultaneously with sealing of the previous initiating slot and by formation in it of coal hydraulic fracturing crack. Cutting of initiating slots in each subsequent hole is performed with a shift of cutting pitch relative to initiating slots of each preceding hole.

EFFECT: enlarging the area of uncovering of fractured coal massif.

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FIELD: mining.

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EFFECT: enlarging gas emission surface area.

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EFFECT: intensification of methane filtration rate is provided.

1 dwg

FIELD: mining.

SUBSTANCE: method includes installation of gas discharge pipes along general shaft ventilation lines and suction of methane from an insulated grinding chamber. Large coal blocks are ground in a grinding chamber upon their delivery there from lava. When coal blocks are damaged, the main quantity of methane contained in them is released and accumulated in a gas-accumulating cavity of a grinding chamber. From this cavity methane is sucked along a gas discharge pipeline to the surface for recycling. The grinding chamber is installed outside the borders of movement of a fresh air jet sent to ventilate second working.

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2 cl, 10 dwg

FIELD: mining.

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4 cl, 2 dwg

FIELD: mining.

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EFFECT: invention provides for most complete extraction of gas contained both in coal beds and in enclosing water-saturated rocks.

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EFFECT: reduced ingress of underground waters to minimum permissible values.

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FIELD: mining.

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EFFECT: providing environmentally safe utilisation of technogenic drainage water.

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FIELD: mining.

SUBSTANCE: method involves pre-planning of tunnel route as per the data of engineering geology and topography and tunnel driving. First, according to the route of the future tunnel there determined are underground water courses, their width, depth, specific yield, distance between them and direction of water movement. Tunnel driving is performed; at that, first, infiltration tunnel of small section is drilled, and then, parallel to it there drilled is the main tunnel with some delay; pillar is left between tunnels, which through the distance determined by technological necessity is cleaved by breaking off, or the main tunnel is driven after infiltration tunnel with absorption of its section. Along the route of infiltration tunnel there arranged are recesses in its wall, into which filters for water interception and reduction of hydraulic pressure are drilled from the surface. Drilling frequency of filters are chosen depending on the number of underground water courses, their thickness and considering water abundance of confined aquifers. At top and bottom of infiltration tunnel there also arranged are upward and downward filters; at that, the water supplied from all filters is collected in water diversion terrace of infiltration tunnel and diverted to safe place on the surface.

EFFECT: reducing construction cost, controlling big water flows, reducing hydraulic water pressure, providing reliable safe and dry driving of the main tunnel and non-overhaul operation in the future.

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FIELD: mining.

SUBSTANCE: proposed invention comprises using uphole of outer string with filtration section aligned with drill string that doubles as protective string that, thanks to high torques can overcome friction forces caused by rock pressure, producing water column in annular space between hoe walls and outer string solid part outer surface equal to the height of column from its sealer to filtration part that kills hydrostatic pressure of local water, and using a controlled gap between outer and drill strings to generated throttling effect of releasing water-sand mix from the bed.

EFFECT: reduced load on drill and outer strings, possibility to control drilling height.

2 cl, 2 dwg

FIELD: oil-and-gas production.

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EFFECT: providing of ability of additional water removing.

3 cl, 4 dwg, 2 ex

FIELD: construction.

SUBSTANCE: method and device for erection of horizontal and drain hole in watered sands is related to mining industry and construction, in particular - to methods and devices for erection of horizontal wells with the help of rotary drilling in watered unstable sands and may be used to dry mineral deposits, industrial sites, to clear heads of underground waters in process of tunneling, construction of buildings with preliminary water drawdown, in erection of horizontal wells of various technical purpose in loose watered soils, also under conditions of high urban saturation. Achievement of result became possible due to maintenance of technological process at permanently maintained pressure of structural flushing liquid higher than pressure of stratal ground waters by 0.3-0.5 atmospheres under protection of stable layer, which is formed by structured flushing liquid on well walls, as a result of which impact of mountain pressure at drilling string is eliminated. Realisation of method is carried out by complex device characterised with availability of mechanical part, including drilling plant, conductor, sealant or drill string, or filtering string and support of vertical excavation, and also hydraulic system of structured flushing liquid pressure provision and maintenance in erected well as higher than pressure of stratal ground waters in periods of horizontal drain hole erection and installation of filters in it, which is made of three functional hydraulic lines.

EFFECT: provision of horizontal drain hole walls stability in process of drilling and installation of filters, increased depth of drilling and diametre of erected well, provision of controlled carryover of sand from layer, preservation of natural soil properties in near-filer zone; increased safety of technological process, increased efficiency of drilling, reduced load at performing elements of drilling plant.

10 cl, 2 dwg, 1 ex

FIELD: mining; construction.

SUBSTANCE: method of horizontal radial drain hole constructing in hard rocks includes vertical shaft sinking and drilling from it horizontal radial drain hole and constructing from its bottom additional vertical shaft. Using both shafts along the full length of horizontal radial drain hole it is located string camouflet charge. After charge explosion there are formed horizontal radial drain hole with area of bund fracturing and then on one side of newly formed horizontal radial drain hole there is mounted surface casing with closer and draining, and on the other - choke. On drained territory there is installed at least one hydro-supervisory well.

EFFECT: reduction of drill footage; reducing of horizontal radial drain hole breakingin terms; rising of its interception ability and ability to make an attendance for dewatering drained territory.

3 cl, 2 dwg, 1 ex

FIELD: mining, particularly to reduce ejection of underground water flowing into mine during mining operations to ground surface.

SUBSTANCE: method involves receiving and collecting of mine inflow, which enters mining zone from cone of depression along mine tunnels; cleaning mine inflow; accumulating thereof in underground water accumulation means and delivering mine inflow into water-bearing seam. Mine inflow is supplied out of cone of depression located outside of mining zone in direction of water-bearing seam depression line to provide water return in operating mine tunnels, wherein distance between lower edge of cone of depression and point of mine inflow supply must be not less than width of mine inflow spreading in water-bearing seam. Mine inflow to be discharged from water accumulation means is supplied to intermediate sump and then is filtered in water-bearing seam due to intermediate sump location in water-bearing seam. Mine inflow is supplied to underground or land-based intermediate sump.

EFFECT: increased efficiency of hydrological regime recovery and improved ecological safety due to landscape conservation and enhanced industrial safety due to elimination of underground gas accumulation in dewatered water-bearing seams.

4 cl, 3 dwg

FIELD: drilling and survey, particularly special methods or apparatus for drilling.

SUBSTANCE: underground system includes drain holes, the first well extending from well drilled from ground surface, mainly from underground excavation interval start to remote end thereof. The system also has a number of side holes extending from the first well. Distance between side hole bottom to well drilled from ground surface may be selected so that it is substantially the same for all side holes to facilitate side hole drilling. Method may also involve uniting two or more drain hole systems within the boundaries of underground zone to provide uniform coverage of full underground zone area. System may additionally have a number of communicating drain hole sub-systems associated with main well drilled from ground surface to reduce ground surface area, which provides access to underground zone.

EFFECT: increased efficiency, provision of uniform coverage of full underground zone area and reduced access area.

54 cl, 10 dwg

FIELD: mining, particularly to prevent underflooding of ground areas to be shifted during underground mining performing.

SUBSTANCE: method involves forming contour trench-like cutoff curtain in ground; creating drainage devices inside the contour and removing water from ground movement trough. The contour trench-like cutoff curtain is arranged along predicted horizontal line of ground surface relief formed after ground subsidence and height mark thereof is higher than that of maximal ground water level in spring. Necessary throughput Q of drainage devices is set on the base of mathematical expressions.

EFFECT: increased safety of underground mineral mining.

2 dwg, 1 ex

FIELD: mining.

SUBSTANCE: method includes the following stages. Installation of a structure inside or tightly with an underground mine, so that the structure provides for reactive forces when pushing a cutting head in direction of the material by means of a series of rigid materials fixed on the structure, which i arranged so that series of rigid elements may be fixed to it simultaneously at least in two directions, so that parts of tunnel branches could be formed in at least two appropriate directions, of the underground mine designed for transportation of people, mechanisms and extracted material. Formation of multiple parts of tunnel branches entering the material. Formation of the first part of the tunnel branch with the help of a cutting head and a series of rigid elements in the first direction, and afterwards formation of the second part of the tunnel branch in the second direction. During formation of the second part of the tunnel branch, movement of rigid elements from the part of the first tunnel into the part of the second tunnel branch for extension of the series of rigid elements in the part of the second tunnel branch.

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