Lubricating element for drag reduction in production and transportation of water-cut heavy oil in wellbore

A lubricating element for drag reduction in production and transportation of water-cut heavy oil in a wellbore, comprising a flow guide component composed of an intermediate rod, flow guide blades, a center cone and a flow stabilizing cone, and a shell component composed of a inlet pipe, a cyclone pipe, a water outlet pipe, a drain cavity, a drain pipe and a ring formation pipe;

• wherein the inlet pipe is funnel-shaped, with the larger end connected with the cyclone pipe, and the smaller end connected with an upstream production and transportation pipe;
• the flow stabilizing cone allows incoming liquid to uniformly and stably flow into four chambers divided by the four flow guide blades fixedly connected to sides of the intermediate rod, the flow guide blades are distributed in a flow channel at an interval of 90° and integrated by using arc sections and straight sections, and the center cone is fixedly connected above the intermediate rod;
• the water outlet pipe is frustum-shaped, with four strip outlet holes evenly distributed around;
• the drain cavity is cylindrical and located outside the water outlet pipe, and encloses the water outlet pipe, with the lower edge of the drain cavity connected with the drain pipe, and a water control valve is connected to the drain pipe;
• a water ring from above the water outlet pipe encloses the central oil core to form an annular heavy oil-water flow for lubrication and drag reduction for transportation;
• an oil-water mixture flows into the lubricating element through a feed inlet, finally water separated from the oil-water mixture is discharged through a water outlet, and the annular heavy oil-water flow with water as an outer ring and heavy oil as a center flows out of an annular flow outlet.