METHOD FOR ADJUSTING PENETRABILITY OF TERRIGENIC COLLECTOR Russian patent published in 2004 - IPC

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes forcing of large volumes of composition with adjustable gel-forming time into bed through force wells, and as gel-forming compound zeolite or hydrochloric acid are used. After pumping of 0.4…0.9 volume of gel-forming solution day gel-forming composition is formed consisting of five consecutive margins: hydrochloric acid water solution margin with mass concentration 15%, fresh water margin, gel-forming compound margin, containing wastes of filaments or fibers of polyacrylonitrile, margins of fresh water and margin of water solution of hydrochloric acid with mass concentration 15%. Volume of day gel-forming composition is (0.05…0.6)q with relation 2:1:2 of volumes of margins of water solution of hydrochloric acid, fresh water and gel-forming compound on basis of hyvpan (q - volume of day share of gel-forming compound of basis of zeolite, m³/day). Then forcing by draining water is performed in volume, equal two day volume of gel-forming solution on basis of zeolite, and well is stopped for technological pause. Forcing of remaining gel-forming solution on basis of zeolite is performed. Gel-forming solution is forced into bed by draining water in volume, equal to volume of day force share, then well is stopped again for technological pause. Gel-forming time of first margin of remaining volume is calculated from given formula.

EFFECT: higher efficiency.

3 cl, 2 ex, 2 tbl