Method to extract materials from thick underground formations

FIELD: mining.

SUBSTANCE: method to extract materials from thick underground formations is carried out by means of formation opening with a well, placement of a well hydraulic monitor unit in it, creation of a naturally balanced vault above a production chamber within the productive horizon and washout of formation rocks with pulp delivery to the surface. In order to increase efficiency of well hydraulic production of minerals, excessive pressure is pulled in the production chamber, which meets the following condition: Pchamb.≥Pform.+0.03 MPa, where: Pchamb. - pressure of working fluid in the production chamber, Pform. - formation pressure. At the same time the pressure in the chamber is continuously monitored with sensor installed in lower and upper parts of a movable pipe of the hydraulic monitor unit, and the excessive pressure in the production chamber is provided by control of the working fluid supply into the well, with high-quality of hydraulic insulation of the annular space with mortars based on bentonite powders with specific viscosity from 50 sec. until "non-liquid" state.

EFFECT: higher efficiency of well hydraulic production of minerals.

2 cl, 1 dwg

 

The invention relates to mining, in particular to the borehole hydropobic minerals in the unstable cap rocks.

A device for fastening the roof of the mining chambers in borehole hydropobic minerals, ensuring the sustainability of the mining code of the camera creating artificial roof. In the well casing is lowered device in the form of an inverted umbrella, after deploying it serves hardening of the mixture, creating the lining of the roof of the mining chamber (RU, patent for invention №2101507, IPC6AS 45/00, publ. 10.11.1998). The disadvantage of this method is that the casing thus cannot be removed or accounted for using the special tool to cut off the lower part of the pipe that leads to a significant rise in the cost of operations.

There is also known a method of hydraulic borehole mining of minerals, where the stability of the roof is achieved by alternating the development of the mining chambers in the form of vertical slots. After excavation of the first stage and bookmarks make working out of the slot chambers of the second stage under the protection of the artificial pillar (RU, patent for invention №2081324, IPC6AS 45/00, publ. 10.06.1997).

The disadvantage of this method is its limited application, as in a loosely coupled watered rocks occurs dislodging rocks and slotted ka is er is not formed.

The closest technical solution to the claimed is a method of extracting materials from a powerful underground formations, which includes the opening of a productive horizon mining well, placing it hydroporinae equipment, erosion of rocks of the roof within the set of natural balance over the production camera, hydraulic erosion of the productive horizon and the rise of the pulp to the surface with the formation of the mining chamber (EN, copyright certificate №1372045, IPC IS 45/00, publ. 07.02.1988).

This method offers the maintenance of hydraulic borehole mining under the arch of the natural balance, which is formed in the immediate roof before the beginning of the erosion of productive formations; this assumes that the pre-formed arch has a carrying capacity and prevents collapse of the overlying rocks in the mined-out area (with the exception of rocks enclosed in the volume of the arch).

However, this method is extremely small scope, while its implementation is associated with low efficiency or inability to use the unstable conditions of the host rocks because of unpredictable collapse of the roof in the process of erosion of the productive formation. This is primarily due to the fact that the rocks of the roof, in which the pre-form the arch of the natural equilibrium is ay washout, have as low resistance and pronounced rheological properties, i.e. quickly lose their bearing capacity during the time course of the process. This leads to the fact that originally formed the vault of the natural equilibrium loses stability and ceases to perform the function of maintaining the cap rocks, which are getting developed in the camera space, lead to the dilution of the ore, prevent erosion of the productive formation or cause breakage hydroporinae equipment.

The objective of the invention is to increase the efficiency of a hydraulic borehole mining of minerals.

The technical result is achieved in that in the method of extracting materials from a powerful underground formations, including the opening formation borehole, placing it well jetting unit, forming a natural arch equilibrium over mining chamber within the producing horizon formation, erosion of rock formations with the issuance of the pulp on the surface, in mining the camera creates excessive pressure corresponding to the condition:

Pthe cameras.≥Rthe layer.+0.03 MPa,

where Rthe cameras.the working fluid pressure in the production chamber,

Pthe layer.- reservoir pressure.

The pressure in the chamber is continuously controlled by sensors, the mouth of blennie in the lower and upper parts of the movable pulp-raising pipe jetting unit. Excessive pressure in the production chamber to control the supply of operating fluid into the well, with quality waterproofing annular space solutions based on bentonite powders with a nominal viscosity of 50 seconds until the status "not flowing". The formation of the set of natural balance on mining the camera starts from a bottom of the productive horizon.

The invention consists in creation of conditions ensuring the stability of the set of natural balance over the production chamber through the creation of excess pressure in the chamber provided a seal production camera.

The creation of excess pressure in the chamber corresponding to the condition

Pthe cameras.≥Rthe layer.+0.03 MPa,

where Rthe cameras.the working fluid pressure in the production chamber,

Pthe layer.- reservoir pressure,

you can prevent or significantly reduce the collapse of the roof rocks and reduce the dilution of ore with barren rocks, thus, improves the efficiency of the process and safety of the operations.

Constant pressure control in mining the camera sensors mounted in the lower and upper parts of the movable pulp-raising pipe jetting unit, allows to make the process more manageable.

Security is their excessive pressure in the production chamber by regulating the feed of working fluid in the borehole creates excess pressure of process fluid in the production chamber above the reservoir pressure. Quality waterproofing annular space solutions based on bentonite powders (cement mix) with a nominal viscosity of 50 seconds until the status "not flowing" provides sealing production camera and allows you to create in-camera a slight pressure.

The formation of the set of natural balance over the production chamber from the bottom of the productive horizon formation prevents the dilution of the mineral species of the roof.

From the analysis of scientific-technical and patent information inventive combination of techniques to ensure the sustainability of the natural arch equilibrium over production camera we have not identified that allows to make a conclusion on the conformity of the proposed technical solutions criteria of "novelty" and "inventive step".

The invention is illustrated in the following figure, which shows a schematic section illustrating a method of extracting materials from a powerful underground formations (well hydropobic minerals in the unstable cap rocks).

Downhole jetting unit contains vatopediou column (1) with the jetting nozzles: lateral scour (2) and lower pulpotomy (3), air column (4) with a mixer (5) and pulp-raising column. Pulp-raising column consists of a movable is th pulp-raising pipe (6), rigidly attached to vodopada column (1), and stationary pulp-raising pipe (7). The annulus between the wellbore and the stationary pulp-raising pipe (7) is sealed cement mixture (8) (solution on the basis of bentonite powders for viscosity from 50 sec to state "not flowing"), and the gap between mobile (6) and stationary (7) pulp-raising pipes - special seal (9). In the upper and lower parts of the movable pulp-raising pipe (6) monitor unit mounted pressure sensors (10, 11).

The invention is as follows. From the surface to the producing horizon known methods of drilling a well, after working the wellbore, lowered downhole jetting Assembly.

The gap between mobile (6) and stationary (7) pulp-raising pipes seal special seal (9).

Annulus (annular gap) dampproof cement mixture (8) based bentonite powder with a maximum nominal viscosity of 50 seconds to position "not flowing", ensuring the sealing of the mining chamber during its testing. Supply of cement mixture in the annulus is carried out by known methods. After stabilization grouting mixture is done by opening an underground formation using a downhole hydrom nedorogo unit, while the destruction of unconsolidated or weakly cemented rocks are made using lower pulpotomy jetting nozzle (3). After reaching the desired depth is erosion of the productive formation through the jetting side of the nozzle (2). For ore horizons, composed of unconsolidated or weakly cemented rocks, testing, preferably by blur ore formations from the sole (bottom of productive formations). The lower nozzle (3) supports ruined the breed in suspension and supplying pulp to the suction boxes (12) movable pulp-raising pipe (6) pulp-raising columns downhole jetting unit. The rise of the pulp on the surface are carried out by the stationary pipe (7) pulp-raising columns downhole jetting unit by supplying compressed air vozduhoprovodyaschih column (4) through the mixer (5). Based on the readings of the pressure sensors (10 and 11)installed in the upper and lower parts of the movable pulp-raising pipe (6), regulate the flow of the working fluid (water) into the well on the power column (1), provides a slight excess pressure in the production chamber above the reservoir pressure. The pressure in the production chamber in its lower part, slightly lower than in the upper part, due to a vacuum created is imago suction device of the bullet. The difference in elevations between the side erode the nozzle (2) and suction box (12) downhole jetting unit provides a small pressure drop in the chamber and forms a flow of fluid from the bottom (the side walls of the chamber) to the sole formation (the"suction" of the unit)with the formation of the lower part of the mining chamber in the form of an inverted cone. Excessive pressure in the upper part of the mining chamber ensures the stability of the roof rocks.

This method was tested in the extraction of buried zircon-titanium Sands Lukoyanov field in Nizhny Novgorod oblast, Tarsky field of the Omsk region and the Horde field in the Novosibirsk region.

On Lukoyanov field extraction of materials from subterranean formations were conducted at Pthe layer.=0.15 MPa, with pressure Pthe cameras.to 3.0 MPa, but not below the Pthe cameras.=Pthe layer.+0,03 MPa=0,15+0,03=0,18 MPa, which was achieved by the continuity of the technological process and maintaining the water level in the well during tripping operations with jetting unit, providing excessive chamber pressure 0.03 MPa.

The application of this technology to produce low loss ore and its slight dilution by the waste rock with the average performance of solid - 23.3 m3per hour, without breaking over the barb on the extract block.

This invention during the processing of deposits, occurring among unstable host rocks, which allows to improve the efficiency of hydraulic borehole mining of minerals at relatively low cost by preventing from dilution of ore with barren rocks of the roof. In addition, the use of this method increases the safety when conducting mining operations and meets the requirements of environmental protection, because no subsidence of the roof rocks and, accordingly, there is no violation of the soil and vegetation.

The method of extracting materials from a powerful underground formations, including the opening formation borehole, placing it well jetting unit, forming a natural arch equilibrium over mining chamber within the producing horizon, erosion of rock formations with the issuance of the pulp on the surface, characterized in that in mining the camera creates excessive pressure corresponding to the condition
Pthe cameras.≥Rthe layer.+0.03 MPa,
where Rthe cameras.the working fluid pressure in the production chamber;
Pthe layer.- reservoir pressure,
the pressure in the chamber is continuously controlled by sensors mounted in the lower and upper parts of the movable pipe jetting unit, and the excess pressure in the production chamber about specialt regulation of the working fluid in the borehole with quality waterproofing annular space solutions based on bentonite powders with a nominal viscosity of 50 to a state of "not flowing".

2. The method according to claim 1, characterized in that the formation of the set of natural balance on mining the camera starts from a bottom of the productive horizon.



 

Same patents:

FIELD: mining.

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EFFECT: avoiding execution of underground mine workings at pillar extraction; possibility of selective development of technogenic deposit; arrangement of dehydrated flushing remainders in the worked out space and its complete use; avoiding cavings in the ground surface; recovery of rock mass continuity and stabilisation of its temperature mode; minimum contamination of environment; eliminating the necessity for execution of recreation works.

2 dwg

FIELD: mining.

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2 dwg, 2 ex

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FIELD: mining.

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4 cl, 10 dwg

FIELD: mining.

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FIELD: mining.

SUBSTANCE: solid mass is subject to alluvial re-deposition with water flow. For that purpose, above the level of minefield section there created is water reserve, and in the minefield section there opened is some part of reserves with pioneer ditch. Drain ditch is passed from minefield section so that vortex and laminar flow zones are created in it. Water is drained from storage pond. Water flow breaks solid mass starting from pioneer ditch area, weighs the solid mass material and moves in the flow via drain ditch to the zone with laminar current conditions. In that area the productive particles are deposited, and thin clay material in the form of pulp flows to sludge pit.

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FIELD: mining.

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FIELD: mineral extraction method with the use of underground hydraulic ore cutting and extraction of crushed ore through boreholes.

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EFFECT: increased fullness of mineral extraction.

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FIELD: transport building, particularly to perform mining operations in far north areas.

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EFFECT: reduced unit costs for strong sludge forming and elimination of costs necessary to maintain lane above underwater ground deposit during extended working season.

2 cl, 2 dwg

FIELD: mining industry, particularly borehole mining.

SUBSTANCE: installation comprises platform, hydraulic monitor plant with telescopic head, as well as airlift, rotary device installed on the platform, water recycling system, elastic oscillation generation system and distribution device connected to falling airlift members and to ultrasound disintegrator. Hydraulic monitor plant is provided with automatic hydraulic monitor operation control system installed on additional platform and connected with executive members of rotary device made in hydraulic monitor plant through hydraulic system. Elastic oscillation generation system may produce ultrasound oscillations of changeable power, which are transmitted by means of wash zone oscillators, pre-disintegration zone oscillator and oscillators of ultrasound disintegrator of the fist and the second level. Wash zone oscillators and sensors which record dynamic wash zone properties are installed on upper telescopic bar of T-shaped lever pivotally secured to additional rod of hydraulic monitor plant and brought into cooperation with drive through L-shaped link for lever rotation. Pre-disintegration zone oscillator and sensors which record dynamic properties of pre-disintegration zone are installed on telescopic rotary device hinged with airlift rod. Sensors which record dynamic wash zone properties and ones which record dynamic properties of pre-disintegration zone are linked with control system, which controls ultrasound denerator operational characteristics, and with automatic hydraulic monitor operation control system by digital programmed transforming device. Sensors, which determine dynamic properties of ultrasound disintegrator, are installed at the first level surface inlet and outlet of the ultrasound disintegrator. Above sensors are connected with control system, which controls operational characteristics of ultrasound denerator, through digital programmed device related with the next disintegration operation.

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

5 dwg

FIELD: mining industry, particularly borehole mining.

SUBSTANCE: installation comprises platform, hydraulic monitor plant with telescopic head, as well as airlift, rotary device installed on the platform, water recycling system, elastic oscillation generation system and distribution device connected to falling airlift members and to ultrasound disintegrator. Hydraulic monitor plant is provided with automatic hydraulic monitor operation control system installed on additional platform and connected with rotary device of hydraulic monitor plant through hydraulic system, wherein vertical rod of hydraulic monitor plant is provided with rigid fixers brought into cooperation with slots of additional vertical rod. Elastic oscillation generation system may produce ultrasound oscillations of changeable power, which are transmitted through transformers to wash zone oscillators, pre-disintegration zone oscillator and oscillators of ultrasound disintegrator of the fist and the second level. Sensors which record dynamic wash zone properties and sensors which record dynamic properties of pre-disintegration zone are installed on the additional rod included in hydraulic monitor. Sensors which record dynamic wash zone properties and ones which record dynamic properties of pre-disintegration zone are linked with control system, which controls ultrasound denerator operational characteristics, and with automatic hydraulic monitor operation control system by digital programmed prior transforming device. Sensors, which determine dynamic properties of ultrasound disintegrator, are installed at the first level surface inlet and outlet of the ultrasound disintegrator. Above sensors are connected with control system, which controls operational characteristics of ultrasound denerator, through digital programmed device related with the next disintegration operation.

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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