DEVELOPMENT METHOD OF BOTTOM-HOLE ZONE Russian patent published in 2012 - IPC E21B43/27 C09K8/72 

FIELD: oil and gas industry.

SUBSTANCE: bottom-hole zone treatment method involves the transportation to the working face of the device by means of a wireline, which consists of an air chamber ending with a receiving chamber with the composition located in it and generating the gas during combustion, which releases the mixture of chlorhydric and hydrofluoric acids at thermal destruction, combustion of gas-generating composition and formation of heated gaseous products at increased pressure at treatment interval, process exposure for deeper reaction of chlorhydric acid with the rock, opening of the air chamber at the specified time period due to operation of the combustible diaphragm with igniter, which is installed at its bottom, and export of contaminants from the bottom-hole zone; as the above gas-generating composition there used is the mixture containing the following, wt %: ammonium nitrite grade B 32-33, hexachloroethane 51-53, plastic fluor FP-4 15-16.

EFFECT: increasing the treatment efficiency of bottom-hole zone composed both of terrigenous rocks, and carbonate rocks contaminated with silicate deposits.

1 tbl