Uranium mine stratum permeability increasing method

Abstract

The uranium mine stratum permeability increasing method comprises the steps that a motor-pumped well is drilled on the side of a mine of a uranium mine to serve as a shock wave well, the depth of the shock wave well is 5-15 m deeper than that of an injection well or a pumping well on the side, and a communicated ground seam exists between the shock wave well and the injection well and / or the pumping well; the controllable shock wave generator is suspended and lowered to the rock stratum depth of the shock wave well, and the controllable shock wave generator is started; when the generated shock wave acts on the uranium mine reservoir, the energy of the shock wave enables the original tiny pores of the uranium mine reservoir to expand, and the shock wave also impacts off particulate matters and / or blockages attached in the gaps of the uranium mine reservoir, so that the seepage channel of the reservoir is unblocked again, the seepage condition is improved, and the uranium mine reservoir is unblocked. Controllable shock wave operation can be carried out in one or a small quantity of shock wave wells to achieve gap increasing and plug removal of one mining area, the wave range is 25-30 m, and the maintenance time of one-time operation is at least half a year or above.

Description

Technical Field

[0001] The invention belongs to the technical field of uranium mining and relates to a uranium stratum permeability enhancement method. Background Art

[0002] In the current uranium mining process, the leaching efficiency of uranium ore is low. One of the main reasons is that the cracks in the uranium ore rock formations are blocked by fine particles such as sand and rock powder and chemical precipitates such as calcium, magnesium, and aluminum, which hinders the fluidity of the in-situ leaching solution and reduces the extraction rate. The current solution to the problems in the in-situ leaching of uranium is to wash the well, but washing the well can only solve the blockage of the filter, and the efficiency is low and the cost is high. There is no way to unblock the uranium ore formation. Summary of the invention

[0003] The technical problem solved by the present invention is to provide a uranium stratum permeability enhancement method, which can realize the uranium stratum blockage removal at low cost and high efficiency without affecting the uranium mining production.

[0004] The present invention is achieved through the following technical solutions:

[0005] A method for increasing the permeability of a uranium stratum comprises the following operations:

[0006] A machine well is drilled beside the uranium mine shaft as a shock wave well. The depth of the shock wave well is 5 to 15 meters deeper than the injection well or pumping well beside the mine shaft. There is a ground fracture that can be connected between the shock wave well and the injection well and / or pumping well.

[0007] The controllable shock wave generator is suspended and lowered to the depth of the rock formation in the shock wave well, and the controllable shock wave generator is started; when the shock wave generated by the generator acts on the uranium ore reservoir, the energy of the shock wave expands the original tiny pores of the uranium ore reservoir, and the shock wave also impacts the particles and / or blockages attached to the cracks in the uranium ore rock formation, so that the seepage channel of the reservoir is unblocked again, the seepage conditions are improved, and the uranium ore formation is unblocked;

[0008] and / or, when the generated shock wave acts on the uranium reservoir, it is possible to generate a new fracture network inside the uranium reservoir, thereby increasing the gaps or seepage channels in the uranium strata around the shock wave well;

[0009] After the shock wave operation is completed, the controllable shock wave generator is lifted out of the shock wave well.

[0010] The controllable shock wave generator is placed at a depth in the shock wave well equal to the depth of the filter in the pumping well or injection well;

[0011] Alternatively, not more than 5 metres above / below that depth.

[0012] The controllable shock wave generator is provided with 1-10g of energetic material.

[0013] The controllable shock wave generator can be respectively arranged at a plurality of placement points, with one controllable shock wave generator being arranged at one placement point;

[0014] If more than 3 controllable shock wave generators are placed, they should be placed 1 to 5 meters apart from each other;

[0015] If two controllable shock wave generators are placed, they should be placed 2 to 8 meters apart from each other.

[0016] The controllable shock wave generator is suspended and lowered / raised through a cable, and the cable is wound around a winch, a ground pulley and a ceiling pulley arranged beside the shock wave well in sequence; the winch rotates to put the controllable shock wave generator into or raise it out of the shock wave well.

[0017] The particulate matter includes fine particles including sand and rock powder attached to the cracks in the uranium strata;

[0018] The blockage includes chemical precipitates including calcium-containing chemical precipitates, magnesium-containing chemical precipitates, and aluminum-containing chemical precipitates.

[0019] The controllable shock wave operation involves a uranium ore layer with a range of 25 to 30 meters, and the interval between two operations is at least 6 months.

[0020] Compared with the prior art, the present invention has the following beneficial technical effects:

[0021] The invention provides a method for increasing the permeability of uranium strata. A shock wave well is drilled beside an injection well and a pumping well. A controllable shock wave operation is performed in the shock wave well without affecting the normal operation of the injection well and the pumping well. When the shock wave generated acts on the uranium reservoir, the energy of the shock wave can expand the original micropores of the uranium reservoir and may generate a new fracture network inside the uranium reservoir, thereby achieving the effect of increasing the gap. In terms of unblocking, the shock wave can impact the particles and blockages attached to the gaps in the uranium rock formation, thereby making the seepage channel of the reservoir unblocked again, improving the seepage conditions of the in-situ leaching liquid, and helping to improve the mining efficiency of the uranium ore.

[0022] The present invention can carry out controllable shock wave operation in one or a small number of shock wave wells to increase the gap and remove blockage in a mining area. The wave covers a range of 25 to 30 meters, and the maintenance time of one operation is at least more than half a year. Compared with the existing well washing and unblocking, the operation is simple, the operation time is short, the maintenance time is long, and it has the advantages of short operation time, high efficiency and low cost. Compared with chemical washing, it does not require immersion, the processing time is short, and it does not affect the equipment in the well. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention.

[0024] Among them, 1 is a ceiling pulley, 2 is an armored cable, 3 is a controllable shock wave, 4 is a shock wave well, 5 is a shock wave generating point, 6 is a ground pulley, 7 is a winch, 8 is ground leaching liquid, 9 is a ground leaching liquid filter, 10 is gravel, 11 is a formation, 12 is a first physical blockage, 13 is a second physical blockage, 14 is a chemical blockage, and 15 is a well pumping filter. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with the embodiments, which are intended to explain the present invention rather than to limit it.

[0026] like Figure 1 As shown, a method for increasing the permeability of a uranium stratum according to the present invention comprises the following operations:

[0027] A machine well is drilled beside the uranium mine shaft as a shock wave well. The depth of the shock wave well is 5 to 15 meters deeper than the injection well or pumping well beside the mine shaft. There is a ground fracture that can be connected between the shock wave well and the injection well and / or pumping well.

[0028] The controllable shock wave generator is suspended and lowered to the depth of the rock formation in the shock wave well, and the controllable shock wave generator is started; when the shock wave generated by the generator acts on the uranium ore reservoir, the energy of the shock wave expands the original tiny pores of the uranium ore reservoir, and the shock wave also impacts the particles and / or blockages attached to the cracks in the uranium ore rock formation, so that the seepage channel of the reservoir is unblocked again, the seepage conditions are improved, and the uranium ore formation is unblocked;

[0029] and / or, when the generated shock wave acts on the uranium reservoir, it is possible to generate a new fracture network inside the uranium reservoir, thereby increasing the gaps or seepage channels in the uranium strata around the shock wave well;

[0030] After the shock wave operation is completed, the controllable shock wave generator is lifted out of the shock wave well.

[0031] Specifically, the shock wave well can be realized by drilling a well by machine; the specific location can be determined according to geological conditions and hydrological data, as long as there is a connectable ground fracture between the shock wave well and the injection well and / or the pumping well.

[0032] Furthermore, the controllable shock wave generator is placed in the shock wave well at a depth equal to the depth of the filter in the pumping well or injection well;

[0033] Alternatively, not more than 5 metres above / below that depth.

[0034] The controllable shock wave generator is provided with 1 to 10 g of energetic material, which is adjusted according to geological conditions.

[0035] Specifically, the controllable shock wave generator can be respectively arranged at a plurality of placement points, with one controllable shock wave generator being arranged at one placement point;

[0036] If more than 3 controllable shock wave generators are placed, they should be placed 1 to 5 meters apart from each other;

[0037] If two controllable shock wave generators are placed, they should be placed 2 to 8 meters apart from each other.

[0038] Furthermore, the controllable shock wave generator is suspended in the air by a cable, and the cable is wound around a winch, a ground pulley and a ceiling pulley arranged beside the shock wave well in sequence; the winch rotates to put the controllable shock wave generator into or out of the shock wave well.

[0039] The particulate matter includes fine particles including sand and rock powder attached to the cracks in the uranium ore formation (physical blockages); the blockages include chemical precipitates including calcium-containing chemical precipitates, magnesium-containing chemical precipitates, and aluminum-containing chemical precipitates (chemical blockages).

[0040] Specific examples are given below.

[0041] Example 1

[0042] The pumping well and injection well are in the shape of a plum blossom as a whole, and a well is selected and drilled between the pumping well and the injection well as a shock wave well;

[0043] The specific well selection needs to be determined based on geological conditions and hydrological data. In order to better remove blockage and increase gap, there should be a connectable ground fracture between the shock wave well and the injection well and / or pumping well;

[0044] A ground device is provided, including a winch 7, a ground pulley 6, and an overhead pulley 1; an armored cable 2 (a 7-core cable) is wound around the winch, the ground pulley, and the overhead pulley in sequence; the winch rotates to put in or take out a controllable shock wave generator (model YF-01);

[0045] Specifically, the controllable shock wave generator is provided with 5 g of energetic material, and two controllable shock wave generators are installed on the armored cable 2;

[0046] Lower the controllable shock wave generator into the shock wave well through the armored cable, and adjust the position to correspond to the upper end and the lower end of the filter at the pumping well position;

[0047] Press the start button on the ground, and the control signal is transmitted to the controllable shock wave generator in the well through a 7-core cable. The 220V voltage is inverted into high-voltage discharge, and the released plasma directly drives the energetic material to generate high-intensity shock waves.

[0048] The energy of the shock wave can expand the original tiny pores in the uranium reservoir and may generate a new fracture network inside the uranium reservoir, thereby achieving the effect of increasing the gap. In terms of unblocking, the shock wave can break away the particles and blockages attached to the cracks in the uranium rock formation, thereby unblocking the seepage channels of the reservoir, improving the seepage conditions of the uranium solution and helping to improve the mining efficiency of uranium ore.

[0049] After the controllable shock wave operation, the controllable shock wave generator is taken out.

[0050] The controllable shock wave operation involves a uranium reservoir with a range of 25 to 30 meters, and the interval between two operations is at least 6 months.

[0051] The present invention can be operated for a long time and at any time to achieve a sustained effect, can increase the benefits of the ore deposit, and improve the service life of the mine; controllable shock wave operation can be carried out in one well or a small number of wells to remove blockages and increase gaps in a mining area, effectively reducing costs and improving the leaching rate of uranium ore, and has broad application prospects.

[0052] The above embodiments are preferred examples for implementing the present invention, and the present invention is not limited to the above embodiments. Any non-essential additions and substitutions made by those skilled in the art based on the technical features of the technical solution of the present invention shall fall within the protection scope of the present invention.

Claims

1. A method for increasing the permeability of uranium strata, characterized in that: The following operations are included: A machine well is drilled beside the uranium mine shaft as a shock wave well. The depth of the shock wave well is 5 to 15 meters deeper than the injection well or pumping well beside the mine shaft. There is a ground fracture that can be connected between the shock wave well and the injection well and / or pumping well. The controllable shock wave generator is suspended and lowered to the depth of the rock formation in the shock wave well, and the controllable shock wave generator is started; when the shock wave generated by the generator acts on the uranium ore reservoir, the energy of the shock wave expands the original tiny pores of the uranium ore reservoir, and the shock wave also impacts the particles and / or blockages attached to the cracks in the uranium ore rock formation, so that the seepage channel of the reservoir is unblocked again, the seepage conditions are improved, and the uranium ore formation is unblocked; and / or, when the generated shock wave acts on the uranium reservoir, it is possible to generate a new fracture network inside the uranium reservoir, thereby increasing the gaps or seepage channels in the uranium strata around the shock wave well; After the shock wave operation is completed, the controllable shock wave generator is lifted out of the shock wave well.

2. The uranium stratum permeability enhancement method according to claim 1, characterized in that: The controllable shock wave generator is placed at a depth in the shock wave well equal to the depth of the filter in the pumping well or injection well; Alternatively, not more than 5 metres above / below that depth.

3. The uranium stratum permeability enhancement method according to claim 1, characterized in that: The controllable shock wave generator is provided with 1-10g of energetic material.

4. The uranium stratum permeability enhancement method according to claim 1 or 3, characterized in that: The controllable shock wave generator can be respectively arranged at a plurality of placement points, with one controllable shock wave generator being arranged at one placement point; If more than 3 controllable shock wave generators are placed, they should be placed 1 to 5 meters apart from each other; If two controllable shock wave generators are placed, they should be placed 2 to 8 meters apart from each other.

5. The uranium stratum permeability enhancement method according to claim 1, characterized in that: The controllable shock wave generator is suspended and lowered / raised through a cable, and the cable is wound around a winch, a ground pulley and a ceiling pulley arranged beside the shock wave well in sequence; the winch rotates to put the controllable shock wave generator into or raise it out of the shock wave well.

6. The uranium stratum permeability enhancement method according to claim 1, characterized in that: The particulate matter includes fine particles including sand and rock powder attached to the cracks in the uranium strata; The blockage includes chemical precipitates including calcium-containing chemical precipitates, magnesium-containing chemical precipitates, and aluminum-containing chemical precipitates.

7. The uranium stratum permeability enhancement method according to claim 1, characterized in that: The controllable shock wave operation involves a uranium ore layer with a range of 25 to 30 meters, and the interval between two operations is at least 6 months.

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