Method of hydraulic borehole mining of mineral resources at inclined position of beds

FIELD: mining.

SUBSTANCE: method of hydraulic borehole mining of mineral resources at inclined position of beds involves construction of hydraulic mining and auxiliary wells. Hydraulic mining and auxiliary wells are located in lines along the strike of inclined beds and cross them. Bottoms of vertical hydraulic mining wells are drilled downstream, and bottoms of auxiliary wells having vertical and inclined parts of well, the vertical part is drilled to similar inclined beds and the inclined bed enters similar productive formations, both from upper beds and within productive formations, and is directed towards hydraulic mining wells. Distance between location lines of hydraulic mining wells and auxiliary wells is determined with stability of inter-layer beds-bridges of the worked out area of loose ore beds, and distance between hydraulic mining wells and between auxiliary wells is determined with technical drilling capability of inclined branches towards hydraulic mining wells providing disintegration of loose ores between location lines of hydraulic mining and auxiliary wells of all similar beds subject to development and crossed with hydraulic mining and auxiliary wells.

EFFECT: increasing the scope of mining operations, controlling the mining volume of ore mass as to depth of hydraulic mining well, reducing the scope of construction work of hydraulic mining wells and operating equipment on mining per unit of time.

2 dwg, 2 ex

 

The invention relates to mining and can be used for the production of loose, granular (or disintegrated) minerals through the production well.

The rich reserves of iron ore in the Kursk magnetic anomaly is estimated more than 60 billion tons. The main mass is located at the depth 450-800 m, covered with sand and clay and marl-chalk flooded sediments.

Iron ore is pereslaivaniya strong and friable ore with a capacity of up to 150-250 m, occurring at angles from 30°to 80°. Friable ore strength from 0 to 3 MPa, comprising from 15 to 35% of the total ore reserves and is suitable for hydraulic borehole mining (HBM).

Known the Way of a hydraulic borehole mining of bedded inclined mineral deposits [invention No. 1180508 from 23.09.85,]. The essence of it lies in the opening of the mining block wells drilled from the surface to the underlying reservoir rock, the execution of the reception chamber in the area vydatnou well, the erosion of minerals by hydro from the well, the hydraulic obtained slurry to vydatnou well with subsequent pumping to the surface, then drilling of wells along the axis of the mining unit, coinciding with the angle of incidence of the reservoir, carry out the linkage of the axial wells with a receiving cell, Buryats peripheral wells in l is contained, proceeds from the axial wells at an angle to the axis of the block. Utility block is carried out, starting with the latter, located along the axis of the borehole, with the development of scope of work initially to the periphery of the block and forth in the direction of the fall of the reservoir and to the periphery of the block.

All wells located on the axis of a mining block, giant washout are connected sequentially from issued subsequent to the sole of the layer and form of transport development, which is transported by dip minerals from all wells of the block.

The disadvantage of this method of mining, the inclined formation of minerals by means of auxiliary wells in relation to the occurrence of inclined seams of iron ore at KMA, presents unstable, loose, loose, broken ores, is that in this way provide for the creation of transport workings from the top of the block to vydatnou hole in the sole of the reservoir, as well as branches from the main transport produce to the extreme auxiliary wells of the block by erosion by water jet stream from hole to hole with subsequent erosion of minerals and feed stream from remote wells branch lines to the Central transport development and to vydatnou well.

The creation of such transport you is abook in loose crumbling iron ores impossible due to vplyvania, obvalivanie and their overlap with the angles of inclination of the strata predominantly more than 45°.

Closest to the claimed method and selected as a prototype is a known way of a hydraulic borehole mining of iron ores applied at KMA [Varens, AVENCOM, Agibalov and other "Experience of a hydraulic borehole mining of ores on Seriescom area KMA". Mining magazine No. 1, 1995, p.23-26]. This method is characterized by the construction hydroponicly and auxiliary wells. Thus, in the area in the period 1988-1993, experimental-methodical work on borehole hydropobic iron ore.

There were four hydroporinae vertical well with a final diameter of 300 mm and 15 wells control, auxiliary, hydrogeological diameter 90-150 mm Geological cross-section (Belleroche iron ore Deposit) typical fields KMA. The total thickness of sedimentary rocks above-ore thickness 430-460 m Ore thickness capacity of up to 420 m thickness loose (σSG- 0÷3 MPa) rich ores from 45 to 80 m, with an angle of inclination to the horizontal is more than 45°.

All hydroporinae wells were dissected all layers of friable ores. Erosion of the layers were made giant jets, the rise of the pulp by airlift different hydroponicly shells. The issuance of ore ranged from 2 to 22 t/h, fading in time.

To intensify disinte the walkie-talkie ore layers used pneumohydraulic, hydroshock effects depression method in hydroponicly wells by lowering the level in the wells by pumping air into them under pressure to 3-4 MPa and the injection of air into the auxiliary bore.

In some time intervals the flow of ore reached 60 t/h Average performance was ≈10 t/h

Because of not a regulated selection of ore in depth and its supply to the inlet of air in hydroponicly wells formed large chamber with subsequent landslides, subsidence of rocks hard rocks and ores, leading to bending and breaking threaded connections pulp-raising columns hydroponicly shells.

In the period of experimental-methodical works produced up to 90 thousand tons of iron ore from four wells. Theoretical calculations it was determined that from each well can be produced 100-150 thousand tons of ore.

The disadvantage of this method is the cyclic operation of a single production wells associated with the need for preliminary disintegration of formation of ore through hydroporinae wells with using ineffective methods disintegration of ore and its accumulation in hydroporinae well.

As shown by theoretical studies and experimental work in wells on the destruction of rocks by water jet stream, its effect on the barrier in ZAT is Plenum space decreases with depth and at depths exceeding 500 m reaches zero at a distance of 50-70 cm from the nozzle at a speed of expiration of the jet up to 100-150 m/S.

In hydroponicly wells is Samoobrona friable iron ore due to the difference of rock pressure in the walls of the borehole and the hydrostatic pressure in the well, but the volume of ore depends on an exposed surface of the borehole walls (ening), strength friable ores in uniaxial compression and insufficient per unit of time compared with the estimated performance hydroponicly wells.

Other methods applied disintegration - air-pulse, hydroshock - also ineffective. The most effective depression compared to others, but to release the liquid level in the well requires large energy consumption for operation of compressors, and a short time level rise reduces the overall effect.

The task of the invention is to develop a method of hydraulic borehole mining of minerals in inclined seams for conditions KMA and the like, means controlled delivery to hydroponicum wells masses crushed friable ores of obliquely deposited layers crossed hydroporinae and auxiliary wells in an amount to provide protection of subsoil and trouble-free estimated production volume by known means through hydroporinae well.

Technical results that may be obtained by using for the implemented inventions are:

the increase is mined from one hydroporinae wells and production volume per unit of time compared to now achieved tested currently on the objects of the CMA in borehole hydropobic;

regulation of production of ore in depth hydroporinae hole preventing falls and complications in the borehole;

- reducing the volume of construction activities hydroponicly wells and production equipment for the production of a unit of ore;

- reduction of the specific capital costs of mining.

The solution of the above problems and achieve the listed technical results became possible due to the fact that in the known method of a hydraulic borehole mining of minerals in inclined seams, including the construction of hydroporini and auxiliary wells, hydroporinae and auxiliary wells have lines along the strike of the inclined strata and cross them, and the vertical faces hydroponicly wells razvarivat below for fall layers and auxiliary wells with vertical and slanted part of the borehole, vertical Buryats to the same sloping aquifers and an inclined part includes odnoimennyi productive formations, as from the upper layers, and within the productive layers, and on Rawley in side hydroponicly wells, the distance between lines location hydroponicly and auxiliary wells determine the stability of cross - layer bridges goaf layers of friable ores, and the distance between hydroporinae and between auxiliary wells define the technical possibility of drilling inclined branches towards hydroponicly determining the disintegration friable ores between lines location hydroponicly and support all wells of the same name seams to be working out and crossed hydroporinae and auxiliary wells.

The invention is illustrated by the following drawings.

Figure 1. Section block hydroponicly and auxiliary inclined wells productive layer (top view).

Figure 2. Vertical section hydroporinae and auxiliary wells on their axis located transverse to the extension of the ore column.

Way of a hydraulic borehole mining of minerals in inclined seams is as follows.

The design scheme of the mining block 1, limited points ABCD, drilling the number hydroponicly wells along the strike of the ore strata, crossing the lower reservoir 3 (2) vertically to a certain depth in the underlying layer of solid ore 4 and quartzite 5. At a distance of L1towards lifting productive dps is ists ores are drilling the auxiliary hole 2, no less than one in planes passing transverse to the strike of the formations through wells 1 and at least one auxiliary hole 2 for each hydroporinae well between them, and on one extreme auxiliary borehole at points a and B at equal distances, which are used for wells 1 of this production unit, and for similar left and right of the mining blocks in their construction.

In order fulfill reservoirs ores 3 (they can work bottom-up, top-down or in ascending order of strength properties of friable ores in uniaxial compression), hydroporini wells produce broadening of the 6 in the wellbore in the zone to be mined seam jetting or other methods.

Of auxiliary wells produce 2 drilling spur type 7 in the direction of broadening to the nearest hydroponicum well 1, located in planes passing transverse to the extension of the ore strata through the axis hydroporinae and auxiliary wells.

Branch 7 may be drilled in the layer of the reservoir, close to the roof of his 71in the middle part of the reservoir 72or shoes 73depending on the thickness of the formation and strength friable ores in uniaxial compression.

After the breakthrough of auxiliary wells branches 7 hydroporinae production of the t extending receiving ening 6 hydroporinae well drilling tool, typically, the hydraulic motor to the curves of the sub.

The expansion produced by drilling rassharivanie drilling rod to the length of the working tube rig with turning on acceptable angle. Such an extension can be made if necessary steps to 3/4 of the length of the branch 7.

Simultaneously with the expansion of the inclined branch 7 you can use wave action in combination with the jet stream wave generator according to patent No. 2310078 from 10.08.2006, to enhance the disintegration of ore mass to be mined seam.

When extending inclined branches 7 of hydroporini wells 1 produce the pumping of slurries to determine the performance of the wells and cleaning ening 6. Then pass branch 81and 82, 91and 92and so the left and right of the Central spoetnik of each satellite hole, increasing productivity hydroponicly wells to the calculated values, increasing the number of branches up to 6-7 from each satellite, covering evenly the square block on the productive stratum.

In the auxiliary wells produce water flow not only through the tools, but also through the mouth in the amount of not less pumped airlifting system from each hydroporinae well.

Control goaf formation produced the lead through hydroporinae wells and special, intended for the control of ore mass. In addition, control of the amount of extraction of ore.

After extraction from the waste reservoir estimated volume of mineral optionally produce hardening backfill mixture necessary strength unloading spaces wells and after hardening restore vertikalny trunks hydroponicly and auxiliary wells and transferred to similar work on the development of the next layer of minerals. For a seam on a "bottom-up grouting work produced unloading chambers and vertical boreholes may not be performed.

Practical applicability and effectiveness of the proposed method hydraulic borehole mining of minerals in inclined seams show examples of specific applications.

Example 1. In geological terms Belleroche deposits of iron ore (as described in the prototype) rich ore with a total capacity of up to 422 and on the roof, including friable and polonijnych (σSG- 0÷3 MPa)subject bore hydropobic with an average total thickness of 70 m, reveal four single hydroporinae wells all layers simultaneously. Buryats control, auxiliary, hydrogeological, only 15 units (methodical with vain).

Produce ore extraction from single wells independently in time, using observations of the array and the impact on their methodical. Erosion (disintegration) of ore mass produced giant jets. The rise of the pulp produced by the controlled various hydroporinae shells. During the period of experimental-methodical works were produced 80-90 thousand tons of ore from four wells. According to the calculations hydroporinae well provided production 100-150 thousand tons of ore that averaged per well of 125 thousand tons.

Example 2. In the same geological conditions by the present method hydraulic borehole mining of minerals in inclined seams production produce a unit of wells from 3 hydroponicly and seven auxiliary. In addition, there are a number of wells, as in the prototype, methodical to monitor the array and mining block.

Hydroporinae wells are used for lifting ore hydroporinae shells with airlift-type system. Auxiliary wells are used to supply friable ore productive layers in hydroporinae well.

Mining block is in terms of band width of 35 m and a length of 150 m along the strike of the ore layers of the array.

To simplify the calculation, the efficiency of hydropobic iron ore by the claimed method, we assume that operating costs in the prot the type and declared the same way. The main costs are capital - structure wells.

In the present method compares the block wells. As the ratio of the value of wells is equal to the ratio of their diameters in the second degree, the cost of the seven auxiliary equal to one hydroporinae.

As a helper at the well block can be used for left and right blocks, we can take the ratio of 7 units.

The amount of friable ores mining of the block will determine based on the block size and the total capacity of friable ores 70 m:

- block length along strike when the distance between hydroporinae wells 50 m 150 m left and right wing on 25 PM

- length of block 7 of auxiliary wells is 150 m when the distance between them is 25 m;

- length of productive layers between hydroporinae wells and ancillary 60 m in the fall of ore layers at an angle of 55°.

The amount of friable ores will be

60×150×70=630 thousand m3.

The average density of loose ore ≥3.5 t/m3.

The mass of loose ore block will be 2205 thousand tons.

Take the coefficient of extraction of ore 50%. Equating the cost of the seven auxiliary wells to the value of one hydroporinae can compare the estimated production per well of a prototype and the proposed method.

Ore extraction at one SLE is Gino the proposed method is

The ratio of the mass of ore produced by the claimed method and the prototype is:times, i.e. the cost of capital the cost of production of 1 ton of ore by the claimed method below of 2.21 times.

In addition, in the present method, the supply of ore is regulated wells that allows you to select from each stratum estimated mass of ore is determined by the thickness ores strong and their strength, which eliminates complications in hydroponicly wells that occurred during the mining of the prototype, which increases the cost of 1 ton of ore. From the above it follows that the inventive method of mining in inclined seams thanks to the combination of essential features when using it on Bolshetroitskom field KMA and other similar on KMA more than 2 times reduces the cost of capital expenditures compared to implemented method of example 1.

Way of a hydraulic borehole mining of minerals in inclined seams, including the construction of hydroporini and auxiliary wells, characterized in that hydroporinae and auxiliary wells have lines along the strike of the inclined strata and cross them, and the vertical faces hydroponicly wells razvarivat lower in the fall, and auxiliary IC is Agin, having vertical and inclined portion of the bore, the vertical part of the Buryats to the same sloping aquifers and an inclined part are in the same reservoirs as from the upper layers, and within the productive layers, and is directed towards hydroponicly wells, the distance between lines location hydroponicly and auxiliary wells determine the stability of cross-layer bridges goaf layers of friable ores, and the distance between hydroporinae and between auxiliary wells define the technical possibility of drilling inclined branches towards hydroponicly providing disintegration friable ores between lines location hydroponicly and support all wells of the same name seams to be working out and crossed hydroporinae and auxiliary wells.



 

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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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