Abstract: A riser apparatus includes a riser section and a flow control device. The riser section is disposed on a riser. The flow control device's body installs in the riser section. The assembly may install between uphole and downhole side ports, which may be interconnected by bypass piping and an intermediate device, such as a pump. At least one annular seal rotatably supported by bearings in the body's inner bore can engage a tubular passing therethrough and can seal an annulus therebetween. In one example, pressure uphole of the annular seal may be kept greater than downhole pressure. A debris barrier disposed on the uphole end of the body covers an annular area from an outer perimeter at the exterior of the body toward a central opening at the inner bore. The debris barrier prevents debris, such as drilling cuttings, uphole of the debris barrier from entering into the body's inner bore.

Abstract: A riser apparatus includes a riser section and a flow control device. The riser section is disposed on a riser. The flow control device's body installs in the riser section. The assembly may install between uphole and downhole side ports, which may be interconnected by bypass piping and an intermediate device, such as a pump. At least one annular seal rotatably supported by bearings in the body's inner bore can engage a tubular passing therethrough and can seal an annulus therebetween. In one example, pressure uphole of the annular seal may be kept greater than downhole pressure. A debris barrier disposed on the uphole end of the body covers an annular area from an outer perimeter at the exterior of the body toward a central opening at the inner bore. The debris barrier prevents debris, such as drilling cuttings, uphole of the debris barrier from entering into the body's inner bore.