Rapid mining method for sandstone-type uranium resources in uranium and coal superposed area

A rapid mining method for sandstone-type uranium resources in a uranium and coal superposed area, comprising:

• arranging a high-density adjustable well pattern in an in-situ leaching mining area, wherein the in-situ leaching mining area is the uranium and coal superposed area, the high-density adjustable well pattern is in a form of a five-spot well pattern, a well diameter of an injection well located at an edge of the high-density adjustable well pattern is a first well diameter, well diameters of an injection well and a pumping well located at non-edge of the high-density adjustable well pattern are both second well diameters, and the first well diameter is less than the second well diameters;
• determining a length and a position of a filter located on the in-situ leaching mining area through a digital well construction technology;
• and
• carrying out mining operations to rapidly obtain sandstone-type uranium resources in the uranium and coal superposed area in a production stage,
• wherein the mining operations comprise:
• carrying out pumping/injection centralized filtration by the filter on the in-situ leaching mining area;
• carrying out intensified leaching through a strong oxidation reaction and a strong complexation reaction in the production stage;
• carrying out high-intensity extraction through a high-lift and large-flow submersible pump operation mode in the production stage;
• carrying out high-intensity liquid injection through a pressurized injection and uniform liquid injection regulation and control mode in the production stage;
• and
• changing a layout of the high-density adjustable well pattern in the production stage;
• wherein the determining a length and a position of a filter located on the in-situ leaching mining area through a digital well construction technology comprises:
• collecting well logging data of the in-situ leaching mining area in a mineral deposit exploration stage;
• building a model fused with a three-dimensional heterogeneous stratum and a uranium ore body according to the well logging data;
• discretizing the model fused with the three-dimensional heterogeneous stratum and the uranium ore body to form a fused model comprising a geometric model and a uranium grade model;
• adding an in-situ leaching well drilling process on the basis of the fused model, and setting an opening position and an opening length of the filter, so as to obtain an engineering seepage model;
• building engineering seepage models with different well spacings with recoverable uranium resources as an objective function, so as to obtain a preferred well spacing;
• and
• optimizing the length and the position of the filter on the basis of determining the preferred well spacing and in order to reduce vertical dilution, so as to determine the length and the position of the filter located on the in-situ leaching mining area;
• wherein the carrying out pumping/injection centralized filtration by the filter on the in-situ leaching mining area comprises:
• carrying out water pumping and injection circulation on an ore-bearing aquifer by the filter before the in-situ leaching mining area is put into production;
• and
• carrying out the pumping/injection centralized filtration by the filter loaded with a reagent of limestone and quartz sand with a particle size of 2 mm to 5 mm after the in-situ leaching mining area is put into production;
• wherein the carrying out high-intensity liquid injection through a pressurized injection and uniform liquid injection regulation and control mode in the production stage comprises:
• installing a wellhead device with an anti-pressure capability >2 MPa on the injection well, and in the production stage, carrying out the pressurized injection by means of an in-situ leaching injection pressure of 1.0 MPa to 2.0 MPa;
• and
• controlling a liquid injection flow of the injection well in the in-situ leaching mining area to be consistent by means of regulation and control in the production stage.