METHOD FOR EXTRACTING LIQUID MINERAL INCLINED TO TEMPERATURE PHASE TRANSITION Russian patent published in 2004 - IPC

FIELD: liquid mineral extraction technology. SUBSTANCE: according to the method for protecting operation column from solid formations, forming of extracted liquid mineral during its transfer from productive layer to well mouth, before lowering of operation column in the well, by means of hydraulic fracturing, a thief zone is formed. It is formed in the interval of columnar geological section below the pack of regional confining layer, and it is isolated by casing columns of other productive and lost circulation horizons, and it is connected via inter-column space to surface receiving device and to delivery equipment. After that, operation column is lowered, and cementation is performed from well face to formed lost circulation zone. Then, productive layer is uncovered and during process of well completion and mineral extraction protection from solid formations is performed by thermostatting operation column in the interval of possible phase transition. It is performed due to continuous or cycling flow of hot heat carrier along inter-column space into formed lost circulation zone. EFFECT: prevented salt crystallization from oversaturated natural salt waters during their extraction from the well. 2 cl, 1 ex, 1 dwg