PRESSURE-TESTING METHOD FOR WELL PROVIDED WITH FLOW STRING Russian patent published in 2007 - IPC E21B33/12 

FIELD: oil and gas production industry, particularly pressure-testing of cased well provided with flow string.

SUBSTANCE: method involves filling well with gravity solution; lowering inflatable packer connected to hollow logging cable in well along flow string; leading inflatable packer out of flow string and sealing cable lead in flow string at well head; injecting light-weight liquid in inflatable packer via hollow logging cable up to packer expansion and setting in casing pipe under flow string, wherein light-weight liquid has density of not less than that of well liquid; continuing light-weight liquid injection in packer via logging cable along with injecting gravity solution from well head into well hole annulus; maintaining cable interior and hole annulus pressure difference at threshold inner cable pressure level predefined by technical specifications; measuring pressure in hole annulus and recording pressure change; releasing pressure from logging cable and from hole annulus along with maintaining cable interior and hole annulus pressure difference at threshold inner cable pressure level predefined by technical specifications; lifting hollow logging cable and inflatable packer from well.

EFFECT: increased efficiency.

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