Buoyancy control systems for tubes

摘要

Buoyancy control methods for tubes are described. In one embodiment, a buoyancy control method can include a composite tube and a buoyancy control material for controlling the buoyancy of the composite tube. The composite tube can include an internal liner an external coaxial composite layer of fibers embedded in a matrix. One or more portions of the buoyancy control material can be attached to one or more portions of the composite tube to adjust the buoyancy of the one or more portions of the tube.