PROCEDURE FOR TREATMENT OF BOTTOMHOLE ZONE OF WELL AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2011 - IPC E21B43/25 E21B28/00 

FIELD: gas and oil production.

SUBSTANCE: procedure consists in lowering hydro-acoustic generator to bottomhole of well, in washing bottomhole zone with working substance through hydro-acoustic generator, in excitation of hydro-acoustic waves and in creation of depression in zone of pay. Treatment is carried out to complete washout of deposits at bottomhole of the well and bottomhole zone cleaning from mud in an interval of the pay by creation of two-step depression in the pay and by generation of hydro-acoustic waves of radial and lengthwise radiations. Two radiators create two-step depression and generate hydro-acoustic waves simultaneously and continuously in a process of device transfer for actuation of the interval of the pay. Two-step depression is created without a packer, while hydro-acoustic waves are generated in the zone of depression. The device for implementation of the procedure consists of a case with a through channel for inlet and outlet of working substance, of a unit for generation of hydro-acoustic waves, and of an ejection unit with a circular nozzle for creation of depression. On the outlet channel of the device there is set the hydro-acoustic generator, active elements of which are either of disk form, or diaphragm, or vortex, or toroid, or parametric; they operate under a mode of output parametres amplification. The unit for generation of hydro-acoustic waves is made as a toroid resonance chamber with an inlet circular channel and outlet circular nozzle. Normal cross section of the toroid resonance chamber to its axis has either round or elliptical shape. External surface of the case is made in form of cylinder and conic surfaces. These surfaces form elements of a jet unit - a mixing chamber and a diffuser- with an internal wall of either a casing, or the well. Volume and section area of the outlet circular nozzle of the toroid resonance chamber can be regulated.

EFFECT: intensified oil inflow and increased oil yield of pay.

2 cl, 1 dwg