METHOD OF INTENSIFYING IMPACT ON TERRIGENOUS RESERVOIR Russian patent published in 2020 - IPC E21B43/27 C09K8/74 

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: invention relates to the oil and gas industry. Method of interval-intensive stimulating action on the terrigenous reservoir includes interval-by-clay acidic treatment of the bottomhole formation zone, into which the shank-filter equipped with controlled ports and disconnecting packers is lowered. Acid solution is injected into bottomhole formation zone using coil tubing unit. Acid solution used is solution containing 9 % hydrochloric acid and 1.5 % hydrofluoric acid, which is diluted with isopropanol or methanol to 50 %. Intermittent treatment is performed as follows: first, a coiling tubing is lowered by a switching tool, which moves the first port bushing to the open position, Thereafter, the switching tool is lifted from the well and coiled tubing is again lowered, through which said acid solution is pumped with isopropanol or methanol, which is forced into the formation by gas condensate or inert gas. Further, the coiled tubing is lowered with a switching tool, which closes the first port and opens the next one, after which the switching tool is lifted from the well and the coiled tubing is lowered again, and operations on the clay-acid treatment are repeated similarly to the performed operations through the first port. Further, operations are repeated depending on the number of controlled ports. After mud treatment of the last planned interval, the last controlled port is closed, and reaction products are washed from the well with gas condensate.

EFFECT: technical result is higher efficiency of development, high permeability of productive formation on average by 220 %, more complete extraction of hydrocarbons from productive formations.

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