WELL DEVICE FOR SEPARATION OF OIL AND WATER Russian patent published in 2006 - IPC E21B43/38 

FIELD: oil extractive industry, possible use in system for maintaining formation pressure during inter-well water transit for separating structurally condensed oil from extracted product of water intake well, transferred from category of former product well due to water-flooding of productive formation.

SUBSTANCE: device for separation of oil and water includes dividing chamber with static separator and outlet apertures for oil and water. As dividing chamber, lower part of well is used, limited by casing string and dividing collar, which is mounted on tail connected to immersion electric engine of electric centrifugal pump suspended to well on the tubing string. Tail in lower part below dividing collar is provided with limiter, and in upper part above dividing collar - with water outlet aperture. As oil outlet aperture, draining pipe is used with windows and branch pipe for connection of space below diving collar and space above the intake of electric centrifugal pump. On the tail below dividing collar, cover is positioned in form of barrel with possible vertical movement along the tail. Cover has guides made in form of sleeves with possible contact to tail limiter, and with internal surface of casing string wall by means of its external spring-loaded dentils. Static separator is made of external and internal concentrically positioned pipes, closed from below, with circular space between them, divided by walls with horizontal apertures on sectors. Upper pipe is closed from above, in upper section in sectors is provided with apertures for influx of separated oil into sub-collar zone and across whole length has radial apertures for intake of liquid into half of sectors as in every second sector. Internal pipe being an extension tail, across whole length in remaining sectors has radial apertures for intake of water into it and further into tail, while total area of inlet, and also outlet apertures is not less than cross-section area of product column of well.

EFFECT: device provides separation of small volumes of oil from large volumes of water.

3 dwg