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AssigneeMagyar Szenhidrogenipari Kutato-Fejleszto Intezet
InventorsSandor Doleschall, Gyorgyi Gaal, Miklos Kristof, Gyula Milley, Tibor Paal, Jozsef Papay, Antal Szittar, Geza Udvardi
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A method for injecting water into fluid storing rocks containing clay minerals, in particular in hydrocarbon sites formed by sandstones, sands, marlaceous sandstones, water storing rocks, geothermic circulation sites, in zones in the vicinity of wells, extending to large sites. Continuously or discontinuously compounds are introduced into the storing rocks having a hydrated cation diameter in the range between 0.13 and 0.15 nm, a coordination number 12. The compounds are preferably potassium-, and/or ammonium-, and/or zirconium salts. Depending on the clay content of the storing rock, stabilization is performed by using a solution of the enumerated salts in a concentration of 0.1-500 g/l, advantageously 0.1 to 300 g/l, and in a quantity of 0.5 to 5000 m.sup.3, preferably 50 to 3000 m.sup.3, which is related to the vertical dimension of the rock, expressed in meters.
In a post-primary hydrocarbon recovery process including the injecting of solution in water, in one or more organic solvents, or in a mixture of one or more organic solvents and one or more inorganic solvents, into rock strata containing the hydrocarbon to be recovered, the improvement which comprises stabilizing said rocks containing swellable clay minerals, the rock strata including sandstones, sands and marlitic sandstones, water storing rocks, geothermal circulation sites and zones in the vicinity of hydrocarbon production wells, which stabilizing comprises the steps of
Dependencies are inferred from the claim text.