METHOD FOR SEISMICALLY INFLUENCING PRODUCTIVE FORMATION Russian patent published in 2007 - IPC E21B43/16 

FIELD: technology for extraction of oil and oil-gas deposits by vibro-seismically affecting a bed using generators of resilient waves with working range of frequencies ranging from 0,1 to 250HZ.

SUBSTANCE: in accordance to method, bed is stimulated vibro-seismically by oscillations created by ground-based oscillation sources. Dominant frequency of productive bed is determined. Additional sources are mounted. Vibro-seismic effect onto bed is performed by oscillations created by group of two and more generators of resilient waves, in two stages. At first stage, operation of generators is provided for synchronously with frequency equal to dominant frequency (ν₀). At second stage group of generators is divided onto two sections equal or close in terms of number of generators. Each section is adjusted for certain frequency on basis of condition that average frequency of generators of whole group is equal to dominant frequency of productive bed, while difference between frequencies of each part of generators (Δν) is determined in accordance to linear dimension of geological body being processed from condition that Δν<ν/L, where: ν - average movement speed of resilient wave up to productive bed with appropriate frequencies of each part of generators, m/s; L - linear dimension of geological body being processed, m. Range of effect of seismic oscillations in productive depth is increased by decreasing frequency of pulsation of these oscillations.

EFFECT: increased hydrocarbon recovery of beds because productive bed is stimulated by waves with dominant frequency and relatively low frequency depending on dimensions of geological body being processed, and also due to relative increase of amplitude of resilient wave reaching the productive bed.

1 cl, 1 ex