METHOD FOR COMBINED DEVELOPMENT OF OIL AND POTASSIUM DEPOSITS Russian patent published in 1997 - IPC

FIELD: mining industry. SUBSTANCE: this can be used for combined development of oil and potassium deposits which fully or partially coincide in plan. According to method, oil is recovered from wells and watering of oil beds is performed through injection wells. Potassium salts are extracted in mines and processed and liquid waste is buried in deep water-carrying horizons. Watering of oil beds is effected by means of solutions of sodium chloride with concentration of 5-25%. Used for preparation of solutions are excess salt brines of potassium production with addition of hexametaphosphate in amount sufficient for binding ions of calcium into soluble complex in contacting of injected solutions with brines, and this is also performed for preventing corrosion of oil field equipment. EFFECT: high efficiency. 1 dwg