INTERVAL PACKER DEVICE, HYDRO-MECHANICAL PACKER AND REPRESSION-DEPRESSION ACTION HYDRAULIC PACKER (ITS VARIANTS) Russian patent published in 2007 - IPC E21B33/124 

FIELD: packing devices for isolating shaft of wells during various technological operations.

SUBSTANCE: interval packer device contains longitudinally positioned upper and lower packers with sealing collar packing. Upper packer is made hydro-mechanical, lower packer - repression-depression action hydraulic packer. Positioned between packers is valve unit of two-side action, hydraulically connected to lower packer through in-pipe and annular spaces. It consists of hollow body with at least one radial channel and differential bushing with radials apertures positioned on the body and spring-loaded on both ends by means of reciprocal force springs. All packers are made so that each one of them may be used independently or in composition of other assemblies.

EFFECT: increased reliability of operation and expanded functional capabilities of devices.

4 cl, 13 dwg