RU2000119864A - METHOD FOR PROCESSING BOTTOM ZONE OF HIGH-TEMPERATURE LOW-PERMEABLE SANDY SANDY COLLECTORS - Google Patents

Claims (3)

1. The method of processing the bottom-hole zone of high-temperature low-permeability sandy reservoirs by sequentially injecting hydrophobizing buffer fluid, acid composition and subsequent buffer fluid into the formation, characterized in that, in order to increase the depth of treatment of the formation by slowing down the rate of reaction of the acid with the rock, increasing the penetrating ability of acid composition into a low-permeability reservoir, and improving the removal of reaction products from the treated zone as a hydrophobic buffer liquid They use a solution of an organosilicon water-repellent agent in a mutual solvent, a mixture of hydrochloric acid or clay clay with a mutual solvent is used as the acid composition, a mutual solvent is used as the subsequent buffer liquid, and the treatment is carried out in a dynamic mode without leaving the injected reagents in the bottom-hole zone for reaction.  2. The method according to p. 1, characterized in that as organosilicon hydrophobizing agent use compounds from among organosilanes or organosiloxanes containing functional groups chemically interacting with crystallized water or hydroxyl groups of rock minerals.  3. The method according to p. 1, characterized in that as a mutual solvent using a mixture of butyl cellosolve with isopropyl alcohol, a mixture of ethylene glycol with isopropyl and isobutyl alcohol.