BOREHOLE PERFORATION FLUID Russian patent published in 2003 - IPC

FIELD: well drilling. SUBSTANCE: invention directed to perforation of low- pressure production formations, in particular to preparing perforation fluid, consists in that, to 184-194 ml (93-97 wt %) of water, 2-6 g (1-2 wt %) of grass flour are added to produce suspension, to which further are added 4-8 g (2-4 wt %) of carboxymethylcellulose. In particular, grass flour is crushed vegetable waste from cereals, leguminous plants, oil- bearing crops, spinning plants, or blended annual and perennial plants. Preparation is carried out in cementing outfit. EFFECT: reduced filtration properties of fluid, reduced depression in formation within development period, and increased formation permeability restoration factor. 2 cl, 2 tbl, 5 ex