PERFORATION CLEANING METHOD OF BOTTOM-HOLE ZONE Russian patent published in 2012 - IPC E21B37/00

Abstract RU 2456434 C1

FIELD: oil and gas industry.

SUBSTANCE: depression pressure differential is created between borehole cavity and tubing string cavity due to lowering of tubing string to the well, which are equipped with hydraulic vacuum sludge pump in closed position, packer and flapper-valve, which are in-series located from day surface; separation of bottom-hole perforation zone under packer from borehole cavity above packer is performed due to packer mounting; fluid burst from formation to cavity of tubing string and removal of impurities from bottom-hole perforation zone is performed due to opening of hydraulic vacuum sludge pump.

EFFECT: improving treatment quality; reducing labour intensity.

7 cl, 1 dwg

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RU 2 456 434 C1

Authors

Mal'Tsev Sergej Ivanovich

Dates

2012-07-20—Published

2010-12-30—Filed