METHOD AND DEVICE FOR REAGENT AND IMPULSE WELL AND PRODUCTIVE BED TREATMENT Russian patent published in 2006 - IPC E21B37/06 E21B28/00 

FIELD: oil production industry, particularly for well bottom cleaning.

SUBSTANCE: method involves supplying active liquid medium through pressure booster; applying impulse action to liquid medium; supplying active liquid medium into jet means nozzle and extracting passive liquid medium from formation zone. The active liquid medium is mixture including aliphatic and aromatic hydrocarbon solvents to which treated demulsifier is added. The active liquid medium is formed in formation under 10-20 MPa pressure and held in the formation for 12-24 hours. Passive liquid medium is removed from well productive zone by performing two-stage impulse-wave depression action. Then hydroimpulsive treatment of bottom zone intervals is performed with the use of pressure booster with flat jet head, which generates flat fan-like jets of technological liquid, wherein impulse frequency is 50-300 impulse per minute, pressure is 1.5-2.5 static pressures in well at formation level. Then passive liquid medium is finally removed from formation zone. The technological liquid is all-purpose surfactant solutions. Device comprises flow string, jet means installed in flow string and provided with active nozzle, mixing chamber, diffuser, active and passive liquid media inlet and outlet channels, as well as packer and pressure booster arranged under jet means. The pressure booster is located under well zone perforation area so that pressure booster may be lifted in several stages. The jet means may operate in two modes. Pressure booster has flat jet head located in lower part thereof. Device additionally has depression impulse generator and impulse-wave depressor arranged in predetermined locations.

EFFECT: increased oil and gas well recovery, improved injection well intake capacity, increased initial well bottom zone permeability.

3 cl, 6 dwg