METHOD FOR DEPRESSIVE HYDRODYNAMIC ACTION ON FORMATION, AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2013 - IPC E21B28/00 E21B43/25 

FIELD: mining.

SUBSTANCE: group of inventions refers to modification of reversed vertical seismic profiling (VSP), which uses an implosive source as a source of elastic vibrations, which is used at the same time for hydrodynamic depressive action on the fracture. The method consists in action on the formation by means of abrupt opening of windows in an implosive chamber. Productive formations are tightly separated from the above lying borehole space by means of a hydraulic packer lowered together with the device to the cased well. Abrupt opening of windows in the chamber with atmospheric pressure leads to depressive action on the formation and evacuation from it to the chamber of formation fluid together with components that contaminate the filtrate. During action on the formation the change as to time of pressure of formation fluid is recorded and seismic signals are recorded with VSP receivers of direct and reflected waves from the chamber and from boundaries of the formation, which a hydraulic impact wave reaches. The device is intended for joint performance of reversed VSP or between borehole translucence and hydrodynamic action on productive formation after its opening and at repair in the cased well. The implosive device consists of a throttle and valve assembly, a packer, a working chamber (emitter), a receiver and a signal recording compartment.

EFFECT: increasing influxes from wells with evaluation of action on productive formations.

2 cl, 3 dwg