METHOD OF WELL BORE ZONE TREATMENT FOR PRODUCTIVE FORMATION Russian patent published in 2015 - IPC E21B43/16 E21B43/25 E21B47/06 

FIELD: oil and gas industry.

SUBSTANCE: method of a well bore zone treatment for a productive formation that includes running in of an in-series bottom-up mounted hydroimpulsive device and a jet pump at the pipe string to the well. Fluid is delivered to the hydroimpulsive device and this fluid is used for an impact on the well bore treatment zone with simultaneous pumping the fluid with colmatage particles by the jet pump to the surface. A depth gauge is mounted additionally at the tubing string in front of the hydroimpulsive device. At that a rotary hydraulic vibrator is used as the hydroimpulsive device to create a water jet and pulse-cavitating flow along the perforation interval. An impact on structures of the formation with fluid is made by the excitation of resonant oscillation of the fluid column in the well due to matching of the ripple frequency of the rotary hydraulic vibrator and own resonance frequency of the casing string with the fluid, placed below the rotary hydraulic vibrator and being a resonator of an organ pipe type. The required oscillation frequency f, Hz, is determined by the specified mathematical expression.

EFFECT: improved efficiency of performed surveys and treatment of the well bore zone of the formation with a combined water-jet effect on perforated openings or filters of the production casing and the pulse-cavitating flow to the formation structure with fluid and monitoring of the treatment parameters.

2 cl, 1 dwg