Offshore oilfield underground flow assisting separated layer water injection tubular column

The invention discloses an offshore oilfield underground flow assisting separated layer water injection tubular column which comprises an outer tube, an inner tube, a tube anchor, a packer, a Y jointtee joint structure, an electric submersible pump, a locating joint and a production stopper. The tubular column is provided with a dual-layer tube structure, a flow passing channel is additionally arranged, the functions of water collection and separated layer water injection are achieved through a single well, and well slot space is saved for a platform; the electric submersible pump is used forunderground supercharging water injection, the water injection pressure is increased, the ground flow path is reduced, and platform space utilization is reduced; and by means of designed bridge typemeasuring and adjusting work barrels, the separated layer water injection requirement under the dual-layer tube condition is met, and the separated layer water injection adjusting success rate is guaranteed. 本发明公开了一种海上油田井下助流分层注