The invention relates to an
underwater dual-screw mixed transportation supercharging device. The
underwater dual-screw mixed transportation supercharging device comprises a deep-water motor, a dual-
screw pump, a
homogenizer, a
liquid storage tank, a
piston type pressure compensator and a
capsule type pressure compensator, wherein the dual-
screw pump is positioned above the deep-water motor; the
homogenizer is in
butt joint with a
wellhead pipeline; the
liquid storage tank is in
butt joint with a submerged pipeline; independent pressure compensation and cooling-lubricating loops are respectively adopted in the deep-water motor and the dual-
screw pump, and work separately; movable seals of the deep-water motor and the dual-screw pump are balanced in
internal pressure and
external pressure. The
underwater dual-screw mixed transportation supercharging device is safe and reliable, and has long service life. Compared with the conventional underwater dual-screw mixed transportation supercharging device, the underwater dual-screw mixed transportation supercharging device has the advantages that the structure is simple, and safety and reliability in work are achieved; heat generated by the dual-screw pump and the deep-water motor can be brought away in time, reliable running of the device is ensured,
pressure difference does not exist between the inside and outside of the device, complete pressure compensation is achieved, high economic efficiency is realized, an underwater treatment process is simplified, the platform building cost and running cost are saved, and the supercharging device has remarkable economic benefit and wide application prospect.