Method of well hydromining at excavation with preliminary drying of minerals

FIELD: mining.

SUBSTANCE: proposed method comprises exposure of producing formation by production well equipped with jetting equipment and jetting of minerals. Nearby soil of developed strata horizontal drain hole is drilled for preliminary drying of working zone and creating conditions for operation of jetting in air. Note here that minerals are broken by jetting, gravity and increasing rock pressure resulted from underground water level decrease. This allows mining the minerals at strength of 3-5 MPa. Light grade well is drilled in vertical plane with drain well inclined to mouth to allow outflow of hydraulic mix by gravity and accumulated in settler. Operation of wells of hydromining complex is performed in turns. First, drain well is activated. After water level drop below giant jet nozzle, giant jet is activated. Minerals are mined by intervals in direction from bottom to mouth of operation well and with withdrawal of casing tubes.

EFFECT: higher efficiency of hydromining.

1 dwg

 

The invention relates to the mining industry and is intended for use in borehole hydropobic (SRS) minerals strength up to 3-5 MPa from mining shafts, wells, SunTV, horizontal mine workings, with ledges pitwall. From the technical level there is a method of hydraulic borehole mining mining through vertical wells (SRS) [VG Ahrens. Borehole mining (Geotechnology), M., "Nedra", 1986], and RF patent №51107, Ponomarenko J.V., etc.

The disadvantages of this method include:

- low efficiency of jetting devices for their operation in mining chambers filled with groundwater and work agent, because the energy of the jet quickly extinguished by the resistance of the water environment, therefore the destructive action of the jet is limited to 0.7 m from the nozzle jetting;

- limited size of the mining chambers in plan and in height;

reduced volumes of extraction of minerals from these cameras;

- the need for equipment hydroponicly wells hydraulic Elevator or airlifting systems for lifting the slurry to the surface;

- the possibility of developing of rocks, characterized by resistance to compression less than 3 MPa;

- the complexity of the design hydroponicly wells;

the necessity of building a large number hydroponicly wells, due to the small size of the mining chambers;

- high operating costs.

The aim of the invention is to eliminate said drawbacks and improving the efficiency of Geotechnology SRS minerals from mines.

The proposed method hydraulic borehole mining, which eliminates these drawbacks include: drilling of the shaft horizontal excavation, pit, etc. in the soil productive formation horizontal or radial drainage wells, ascending at an angle of 2-3° to the horizon with the aim of preventing siltation (figure 1). When permeability rocks soil not lower than the permeability of the reservoir, the drainage well you can lay in the underlying rocks. Horizontal or radial wells are available shafts and other mining or from specially studied. In unstable ground wells are under the protection of "deaf" inventory casing pipes. The depth of the horizontal (or radial) wells designated on the basis of geological and hydrogeological conditions and the technological means used. Drainage hole along the entire length equipped with a filter in accordance with the granulometric composition, the stability of the drill breeds and aggressiveness of formation waters in relation to the material of the filter and the valve on the mouth.

Over the drainage hole in od is Oh with her vertical plane construct the ascending sloped-gentle gidrodobychnyh the borehole at an angle ≤6÷10° to the horizontal, that provides delivery of slurry by gravity (see figure 1). The depth (length) of the mining well, taking into account the provisions of the depression curve is assigned approximately equal to the length of the drainage wells. Gidrodobychnyh well fix conductor, perforated pipes, unstable rock - solid casing (when driving) and equip jetting device and a latch on the mouth.

As a working agent use drain water accumulated in the sump or storage.

Development of minerals proposed method is as follows. In the beginning put into operation drainage hole. After lowering of the groundwater level in the reservoir below the position of the mouth of the production well, which is indicated by the cessation of flow of water from it to enter the giant, whose performance is in the air increases compared with the work of the submerged jet.

Mining of minerals carry out the benches in the direction from the bottom to the mouth of the production well. While the casing is extracted pointervalue on the amount being mined zagadki.

The destruction of the developed species occurs in the result of the addition of the impact of a jet stream, gravity and the growing mountain of pressure, for which a whole is consistent with a jet stream in the beginning to make undercutting array at the base of the producing interval. Formed by washing the pulp in accordance with the position of depression of the surface moving toward production wells, which will be discharged in the trunk or horizontal mining production for subsequent pumping to the surface.

After completion of the stage of destruction (erosion) of minerals in the working area, the drainage hole cover. From mining the camera on the well with the water level rise by gravity starts flowing slurry.

By reducing the solids in the slurry to an economically unacceptable level, the cycle of these works carried out in the interval following zagadki.

After testing the first production well hydroponicly complex move along the horizontal output distance set by the project. When the SRS from the stems of new gidrodobychnyh well outline rotated in azimuth and all technological operations is repeated.

Technical results that can be obtained when implementing the present invention is:

- improving the efficiency of jetting due to the draining of the working chamber and create the conditions under which the giant in the air;

- multiple increase in the size of the mining chamber and the volume of the extraction of minerals;

- simplification of the structure hydroporinae complex due to the refusal of the mining equipment is designed wells devices for transporting the slurry through the borehole;

- simplification of the process control hydropobic;

- reducing the number hydroponicly wells for mining of the Deposit (deposits);

- expansion of the scope of the SRS by performing work in shafts, wells, sumpah, in a horizontal mine workings, as well as through the development of a stronger rocks.

The set of essential features of the proposed technical solutions in General will generate substantial economic effect.

The essence of the invention shown in figure 1, where numbered: excavation - 1, the sole productive stratum - 2, drain well 3, hydroporinae well - 4, reduced groundwater level - 5, the slurry - 6.

Practical use of the method is illustrated by the following example.

In the field of phosphatic Sands reservoir average power of 12 m lies at a depth of 51 to 63 m Sands predominantly fine-grained feldspar-quartz-glauconite and mixed with cementitious carbonate and silt material. In the top sand layer is permeable chalk, role PetroChina. The soil is productive stratum is represented watered siltstone and marl. On the section of the SRS average power of argillite is 2 m Top thickness flooded marl does not exceed 10 modi phosphatic Sands, siltstones and marls hydraulically connected and form a single discharge horizon, the natural level which is at a depth of 9 m, the Total capacity of the aquifer is 24 m Average values of permeability and piezoconductivity respectively equal to 2.6 m/day and 1.8·105m2/day.

The limit of resistance of Sands for uniaxial compression is 3 MPa.

The mine is opened by a system of horizontal mine workings, passable on the soil of the reservoir, i.e. at a depth of 63 m from the surface.

From mining (normal to its axis) in soil rudosoderzhaschuyu Sands installing radial drilling UV-130M are drilling horizontal well drainage to a depth of 120 m with a diameter of 200 mm, to prevent silting well ask with a slope to the mouth of 0.01 to 0.02; the well is fixed along the entire length of casing perforated pipes with a diameter of 168 mm and equipped with a gate valve on the mouth.

Directly over the drainage hole in the same vertical plane with it are gidrodobychnyh well also with a diameter of 200 mm to a depth of 120 feet, the Well is fixed simultaneously with the drilling of "deaf" casing to a depth of 110 m Open to development by hidroponia leave the first interval. Given the nature of the curve depression formed directly above the drain what chinoy, hydroporinae the well was built with a slope to the mouth of 0.05, which is necessary for the free outflow of the slurry.

Testing lead from the bottom to the mouth of the well, which after mounting equip jetting device.

The water pressure at the outlet of the nozzle jetting assign equal to 20-30 m Ust this range jets in the air is calculated by the formula [Melnikov NV Quick reference open mining works. M., "Nedra", 1974]:

Lm=1,73KHosinφ,(1)

in which:

K - coefficient of air resistance, adopted 0.90;

Habout- the pressure at the nozzle jetting, m;

φ is the angle of inclination of the jet of the working agent to the wall of the mine chamber, taken 90°.

In this case,

Lm=1,73·0,90·20=31,2 m

The length of the jet used for the destruction of the rocks

Lp=0,3·Lm=9.4 m, which is sufficient for the formation of the mining chamber with a diameter of ~19 PM

For reasons of preserving the stability of the walls and prevent the collapse of PetroChina camera, a further increase in its size in the plan impractical.

The inflow to the drain hole is determined by the formula [Krauch is to SV Calculate the horizontal drainage wells while protecting the pitwall from groundwater (textbook). Belgorod, ed. VIOGEM, 1969]:

Qc=KφC(hl2+h12),(2)

where indicated:

Tof- drained permeability rocks, m/day;

C - the coefficient is determined according to the schedule specified in the work;

hl- the depth of the soil of the stream's length from the well excavation;

h1- height vytachivanija groundwater in mining production.

In practical calculations due to the small values of vytachivanija compared with hl, the value of h1often neglected.

The calculations showed that the steady-state flow to the drain hole is 37.5 m3/hour.

The groundwater level along the drainage wells decreased intensively, and at the wellhead fell in a short time (less than 0.5 days) and decrease evolved towards the bottom of the borehole. The draining of the working area occurred in less than one day, as evidenced by the cessation of flow of water from the spoil is Oh well.

Upon expiration of this period in the work include the giant, at the same time as working agent use drainage water or mine water.

In the air environment, the erosion of the productive formation occurs on almost all of his power. Formed during this hydroporinae Luggage during the development of the working interval (Zachodni) becomes (theoretically) semicylinder.

After completion of the jet formation, drainage hole cover, and then begins the process of recovery of water level in hydroporinae the camera and issuance of slurry in mining production. Residual amounts of minerals are issued through the drainage hole.

After the decline in the ratio T:W<1:30 to go to practice the next interval.

Way of a hydraulic borehole mining watered minerals, including the opening of a productive layer of the mining well equipped with giant, erosion fossil giant jet, characterized in that the soil working strata of the shaft or horizontal excavation lay horizontal drainage well designed for pre-drainage of the working area and create conditions for the operation of jetting the jet in the air, and the destruction of the mineral is the od of the impact of a jet stream, gravity and the growing mountain of pressure due to the decline of groundwater levels, that enables the development of minerals to the strength of 3-5 MPa, gidrodobychnyh gently sloping well constructed in the same vertical plane with a drainage hole with a slope to the mouth, providing the expiration of the slurry by gravity and its accumulation in the sump, operation of wells hydroporinae complex is carried out alternately, first include the drainage well, after lowering the water level below the jetting nozzle to the work of the injected jetting device, the mining of mineral produce pointervalue in the direction from the bottom to the mouth of production wells, respectively, removing the casing on the working interval, in General, the proposed method can increase the size of the mining chamber diameter and length equal to the length of the production well.



 

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2 cl, 2 dwg

FIELD: mining industry, particularly borehole mining.

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5 dwg

FIELD: mining industry, particularly borehole mining.

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EFFECT: increased efficiency of mining operation and increased environmental safety.

5 dwg

FIELD: mining industry, particularly to produce loose, soft or single-grained minerals through production boreholes.

SUBSTANCE: method involves installing drilling rig in one point of area to be treated; drilling inclined production boreholes at an angle to horizon; installing pipes in the borehole; assembling hydraulic production equipment and lifting mineral to surface. Drilling rig is installed in one point to be treated so that the drilling rig may perform azimuth and angular rotation in vertical plane. Several production boreholes extending at different angles to horizon in common vertical plane are drilled by the drilling rig. The first borehole has minimal angle defined by maximal possible length of borehole, which can be drilled by the drilling rig. The next borehole has maximal angle defined by rock deformation area to prevent rock deformation on surface and in mineral production equipment installation area. Remainder boreholes are drilled in the same vertical plane at α3, α4, ... απ angles to horizon, which maximizes efficiency of mineral production. Similar inclined boreholes are drilled in other vertical planes by rotating the drilling rig in azimuth direction through γ1, γ2 ... γπ angles. Mineral is produced simultaneously or sequentially from borehole groups to provide smooth lowering of overlaying rock.

EFFECT: increased mineral removing fullness with the use of single equipment unit, reduced amount of construction-and-assembling operations, possibility to perform operations in any season, reduced costs of operation performing in cold season, increased safety for staff and equipment.

2 dwg, 2 ex

FIELD: mineral field development by hydraulic mining methods, as well as borehole drilling and all-purpose underground cavities creation.

SUBSTANCE: device comprises connection pipe for pressure water. Connection pipe of slurry pipeline has conical constricted section, wear-resistant insert made as spaced rings of wear-resistant material installed downstream from the conical constricted section in slurry flow direction, and conical widening section arranged downstream from the rings. Connection pipe of slurry pipeline has orifices made in area of ring location and adapted to supply pressure water into connection pipe of slurry pipeline via gaps defined between the rings. Hydraulic elevator is arranged at end of connection pipe for pressure water. Connection pipe for pressure water and hydraulic elevator may have water-jet nozzles. Gaps between rings of wear-resistant insert are created due to ring end roughness. As pressure water is supplied part of flow moving via annular gap passes through annular hydraulic elevator and enters into connection pipe of slurry pipeline to create ascending flow. Due to created vacuum washed mineral is sucked into connection pipe of slurry pipeline in slurry form and then transported to surface.

EFFECT: reduced wear of inlet connection pipe part.

3 cl, 1 dwg

Hydraulic monitor // 2272143

FIELD: methods of hydraulic mining, particularly hydraulic monitors for rock breakage with water jets.

SUBSTANCE: hydraulic monitor comprises base, hinge assembly and barrel with nozzle. Through pipe extending along barrel axis is installed in barrel channel and supported by centrators. The first pipe end is communicated with atmosphere, another one is located in the nozzle. Pipe-nozzle diameter ratio is 0.50-0.57. The pipe serves as ejection means. As high pressure water passes through the nozzle streamlined air bubble is created at pipe outlet due to air ejection. Air bubble pressure is less than atmospheric pressure. This provides jet compression at nozzle outlet and as a result increases jet range. Abrasive and chemical materials may be used with water jet to improve rock breakage efficiency.

EFFECT: increased efficiency.

1 dwg

FIELD: mining, particularly to develop gold-bearing rock with high clay content.

SUBSTANCE: method involves loosening rock by applying mechanical action to the rock along with periodically initiating elastic vibrations in ultrasonic-frequency band with constant frequency in clay-sand rock - water system, wherein the elastic vibrations are initiated under constant outer pressure and power for different time periods; determining optimal action application time to provide stable clay particle precipitation in clay-sand rock - water system having constant volume during previously choosing controllable particle dimension range; determining conditional transformation coefficients from mathematical expression; making plot of conditional transformation coefficient change as a function of time; determining increase of controllable initial specific surface of particles to be loosened and halving ultrasound power when controllable initial specific surface of particles to be loosened is increased by an order.

EFFECT: reduced specific power consumption.

6 dwg

FIELD: geotechnology, particularly bore mining in wide range of mining and geological conditions.

SUBSTANCE: method involves drilling bore extending for the full thickness of underground mineral formation; cutting the underground mineral formation in chamber coaxial to the bore with the use of water-jet devices. Before hydraulic formation cutting rock massif is moistened by supplying pressurized water in bore for a time period enough to expand moistened zone for necessary distance, wherein water pressure is less than pressure of hydraulic formation cutting. After formation moistening water-jet device is lowered in the bore to cut mineral in moistened zone adjoining the bore. After that formation moistening and cutting operations are repeated to create chamber having predetermined dimensions.

EFFECT: reduced power inputs for hydraulic rock cutting.

2 dwg

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