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METHOD FOR CONSTRUCTING WATER PRODUCING WELLS OF HIGH WATER INTAKE AND SPECIFIC WATER DISCHARGE IN LOOSE-STRUCTURE WATER-SERVING LAYERS BY MAXIMUM CAVE FORMATION AND GRAVELLING DURING DRILLING
METHOD FOR CONSTRUCTING WATER PRODUCING WELLS OF HIGH WATER INTAKE AND SPECIFIC WATER DISCHARGE IN LOOSE-STRUCTURE WATER-SERVING LAYERS BY MAXIMUM CAVE FORMATION AND GRAVELLING DURING DRILLING