Well pattern arrangement method for in-situ leaching of low-permeability sandstone-type uranium deposit

A well pattern arrangement method for in-situ leaching (ISL) of a low-permeability sandstone-type uranium deposit, comprising the steps of:

• step (1), performing geological exploration on a target ore layer to obtain a refined three-dimensional (3D) geological model, the 3D geological model comprising a strike, a thickness, a width, and a spatial distribution of the target ore layer;
• determining a length of a horizontal section of a horseshoe-shaped well based on an extension range of the target ore layer;
• arranging locations of blasting points according to a blasting scheme;
• and designing a spacing L1 between horizontal sections of a single horseshoe-shaped well and a spacing L2 between adjacent horizontal sections of two horseshoe-shaped wells based on a fracturing range of blasting stress waves, wherein L2<L1;
• step (2), arranging a first set of vertical wells, each vertical well of the first set being located at a midpoint between the horizontal sections of the single horseshoe-shaped well, and arranging a second set of vertical wells, each vertical well of the second set being located at a midpoint between the adjacent horizontal sections of the two horseshoe-shaped wells, wherein a well spacing within the second set is less than a well spacing within the first set;
• and
• step (3), loading explosives at the blasting points within the horizontal section of the horseshoe-shaped well and at corresponding positions within the vertical wells that are aligned with the horizontal section, wherein a spacing between adjacent blasting points within the horseshoe-shaped well is defined as L3;
• a spacing between two vertical wells of the first set is defined as L4;
• and the blasting points within the horizontal section of the horseshoe-shaped well and those within the vertical wells form a five-spot pattern on a common horizontal plane, with L1=L3=L4.