RU2003123093A - METHOD FOR PRESERVING THE COLLECTOR PROPERTIES OF THE BOTTOM ZONE OF THE PRODUCTIVE LAYER OF THE OIL AND GAS WELL - Google Patents

Claims (11)

1. A method of preserving the reservoir properties of the bottom-hole zone of a productive formation of an oil and gas producing well, comprising placing an aqueous solution of mineral salts in the wellbore with additives of a sedimentation inhibitor and a corrosion inhibitor, followed by technological operations in the well, characterized in that as an aqueous solution of mineral salts into the wellbore wells place an aqueous solution of native, modified or enriched carnallite ore or mixtures thereof, while using a solution with a concentrate tion, the maximum temperature for the downhole conditions, and the solution was injected in an amount necessary and sufficient to form a hydraulic column in the wellbore above the roof of the producing formation, and the rest height to the mouth of the well is filled with water. 2. The method according to claim 1, characterized in that as a mineral salt using native carnallite ore composition, wt.%: Potassium chloride 20.5-21.5 Sodium Chloride 19.5-22.5 Magnesium chloride 24.0-27.0 Water of crystallization Rest 3. The method according to claim 1, characterized in that as a mineral salt using a modified carnallite ore composition, wt.%: Potassium chloride 24-25 Sodium Chloride 5-6 Magnesium chloride 31-33 Water Rest 4. The method according to claim 1, characterized in that as a mineral salt using enriched carnallite ore composition, wt.%: Potassium chloride 23.0-29.5 Magnesium chloride 31.8-46.0 Water of crystallization Rest 5. The method according to claim 1, characterized in that the well to the mouth is filled with fresh technical or waste water from oil and water treatment plants or formation. 6. The method according to claim 1, characterized in that the aqueous solution of native, modified or enriched carnallite ore or mixtures thereof is prepared by dissolving in fresh technical waste water from oil and water treatment plants or produced water at a temperature of 60-90 ° C. 7. The method according to claim 6, characterized in that when the solution is prepared by dissolving in produced water, the latter is pumped out of the well at a temperature of 60-90 ° C. 8. The method according to one of claims 1 to 5, characterized in that when the well is perforated, the hydraulic column of the process fluid above the top of the reservoir is taken to be (1.03-1.07) · (1.05-1.1) P _pl , where R _PL - the pressure of the reservoir. 9. The method according to one of claims 1 to 6, characterized in that when perforating a well or suppressing oil and gas occurrences, an aqueous solution of native, modified or enriched carnallite ore or mixtures thereof with a density of 1.23-1.37 t / m3 is used. 10. The method according to one of claims 1 to 6, characterized in that when using an aqueous solution of native, modified or enriched carnaplite ore or mixtures thereof, and as a working fluid - injection wells, the latter is used at a density of 1.05-1, 2 t / m3 11. The method according to claim 10, characterized in that the aqueous solution of native, modified or enriched carnallite ore or mixtures thereof contains an inhibitor of the swelling of the clay component of the oil and gas layer, for example, EDTP or NTF, in an amount of 0.05-0.15% by weight of dissolved carnallite ore.