METHOD OF FASTENING BOTTOM-HOLE ZONE OF RESERVOIR Russian patent published in 2020 - IPC E21B33/138 C09K8/56 

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: invention relates to oil and gas industry and can be used to increase efficiency of development of hydrocarbon deposits with weakly cemented type of collector, in particular for attachment of bottomhole formation zone. Proposed method comprises successive pumping of sodium bicarbonate water solution through production well and water solution of hydrochloric acid salts as plugging compound to form volumetric precipitate in formation conditions. Water solution of sodium hydrocarbonate with concentration of 10–25 wt. % is prepared on fresh water, and aqueous solution of hydrochloric acid salts consists of 10–25 wt. % of calcium chloride, 5–15 wt. % of magnesium chloride and fresh water is the rest. After successive pumping of aqueous solutions, the well is developed without exposure for reaction. Then, technological pause is set equal to 3–6 hours, and then water solution of ETN PKD-515 water repellent is pumped in amount of 1.5–3.0 pore volume with concentration of 0.01–3.5 wt. %.

EFFECT: high efficiency of operating wells with a weakly cemented header owing to formation of a volumetric precipitate of high strength, maintaining filtration-capacitance properties of the borehole zone of the production facility, increasing productivity of the well, increasing production of hydrocarbons from the formation.

1 cl, 2 dwg