Method for transporting crude oil from subterranean crude oil storage areas

摘要

Extracting crude oil from underground crude oil deposits by drilling an injection well and a production well, comprises (a) injecting at least one flood material in the injection well and extracting the crude oil through the production well, (b) blocking high permeable zones of the oil deposits in the region between the injection well and the production well using a first aqueous formulation and a second aqueous formulation, in each case successively injecting separately through the injection well into the oil deposits, and (c) continuing injecting the flood material into the injection well. Extracting crude oil from underground crude oil deposits by drilling at least one injection well and at least one production well, comprises (a) injecting at least one flood material in at least one injection well and extracting the crude oil through at least one production well, (b) blocking high permeable zones of the oil deposits in the region between at least one injection well and at least one production well using at least one first aqueous formulation and at least one second aqueous formulation, in each case successively injecting separately through at least one injection well into the oil deposits, where the formulations after injecting are mixed with one another in a mixing zone and form viscous gels, and (c) continuing injecting at least one flood material into the injection well. The first formulation comprises water and urotropine, the second formulation comprises water and urea, and the first and the second formulation contains at least one additional compound of metal compounds and semi-metal compounds, which when mixed with bases forms gels, where the metal compounds and semi-metal compounds includes iron (II) oxide and iron (III) oxide salts, vanadium salts, zirconium salts, aluminum (III) salts and colloidal silicon compounds. The formulations in the mixing zone after the step (b) amounts to the concentration of urotropine (at least 1 wt.%), the concentration of urea (at least 5.75 wt.%) and the concentration of the at least one compound (at least 5 wt.%), based on the sum of water, urotropine, urea and at least one compound, which are present in the mixing zone, where the temperature at the injection well before the step (b) is not > 60[deg] C.