PROCEDURE FOR TREATMENT OF BOTTOMHOLE RESERVOIR ZONE (VERSIONS) Russian patent published in 2011 - IPC E21B43/16 

FIELD: oil and gas production.

SUBSTANCE: procedure consists in pulse treating bottomhole reservoir zone by pumping fluid into flow string installed into bore of oil well or casing string by means of pump arranged at wellhead. Packers with orifices at height of a tubing string are additionally installed in a gap between the tubing string and surface of borehole or casing string. The pump is pressurising fluid containing fibres, till there is formed a plug in a lower part of the tubing string. When consumption drops for value exceeding characteristic amplitude of fluctuations at constant pressure in the pump, then there is pumped fluid without fibres, and pressure in the pump gradually rises to the moment of rapid growth of fluid consumption. Spherical elements can be also used to form the plug. Notably, diametre of an outlet orifice of the tubing string is less, than internal diametre of the tubing string, while diametre of each spherical element is bigger, than diametre of the outlet orifice of the tubing string.

EFFECT: increased efficiency of the procedure at hydraulic fracturing of reservoir.

6 cl, 2 dwg