COMPOSITION FOR PROCESSING BOTTOM-HOLE FORMATION ZONE Russian patent published in 2011 - IPC C09K8/74 

FIELD: chemistry.

SUBSTANCE: invention relates to oil extracting industry and specifically to compositions for processing bottom-hole formation zone of facial-non-homogeneous low-permeability collectors of producing and injection wells. The composition for processing bottom-hole formation zone contains the following in wt %: halogen acid 5.0-80.0; caprolactam and/or oligomers thereof with molecular weight less than 8000 and/or salt of said oligomer-lactam compounds of general formula [NH₂ ⁺-(CO₂)_m-CO]_n X^-, where m=3-12; n=1-10; X^- is Cl^-, Br^-, NO₃ ^-, HSO₄ ^-, or mixture thereof 0.5-35.0; water - the rest. The invention is developed in subclaims.

EFFECT: high permeability of bottom-hole formation zone, efficient development of oil reserves confined to low-permeability clogged up collectors owing to reduction of the amount of bound water and swelling capacity of clay, dispersion thereof, destruction and subsequent removal.

3 cl, 2 tbl, 2 ex, 2 dwg