PLANT FOR BOREHOLE SEPARATION OF WATER-GAS-OIL MIXTURE FROM WATER Russian patent published in 2013 - IPC E21B43/38 

FIELD: oil and gas industry.

SUBSTANCE: plant for borehole separation of water-gas-oil mixture from water includes an electric submersible pump, two rows of concentrically located tubing strings. The tubing is suspended to the wellhead valves, the lower part of an external row of which near the wellhead is rigidly connected to an internal row. The internal row of the tubing has fracturing within location of the lower part of the external row, where a centrifugal-type separator divided with a partition wall into two parts in built. The separator is equipped with a tube for removal of gas-water-oil flow from under the partition wall to upper part of external row of tubes. A branch pipe plugged from above and provided with side tangential fluid outlet channels to the separator is the continuation of the internal row of tubes. The housing of the separator above the partition wall and on the level below tangential channels of the branch pipe has radial channels and a lower open end, which hydraulically attach it to the external row of the tubing string. Upper part of the separator housing is connected to the internal row of the tubing string by means of a cross-section coupling. The cross-section coupling has tangential side outlet channels for outlet of gas-water-oil mixture from the inner cavity of the external row of the tubing. External row of the tubing with upper end in the wellhead valves is connected to an oil line with a connection pipe, and the internal row of the tubing is connected to the water conduit; at that, the housing of the separator is equipped on the outside with centrators in the form of ribs.

EFFECT: providing uninterrupted operation, excluding the reduction of intake capacity of injection wells, which is determined with deposits of oil products and formation of gas plugs in the pipelines and in the tubing.

2 cl, 5 dwg