FIELD: oil and gas production.
SUBSTANCE: procedure preventing flow from non perforated formation into interval of perforation consists in evaluation of ratio of absolute permeability of nearest water-bearing strata to perforated formation in interval of terrigenous Devonian, in evaluation of distance between them and in calculation of natural disconnection of collectors. If ratio of natural disconnection of collectors in the interval is less, than 2 m, probability of behind-the-casing communications is rendered as growing, and it is concluded to strengthen lining of such intervals with additional technical and process facilities. Ratio of natural disconnection of collectors is calculated from reduced mathematic expression.
EFFECT: raised reliability of behind-the-casing flow prognosis, upgraded quality of well construction.
1 ex, 1 tbl
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