Flexible tubular pipe for transport of fluids in offshore petroleum exploitation contains space to allow for gas drainage between layers of pipe wall

摘要

The pipe has an internal annular space (30) between a pressure sleeve and an intermediate sleeve and a layer (13) allowing drainage of the gases present in the annular space. The layer is made by coiling at short pitch a long element containing transverse drainage spaces or hollows which allow drainage transversely between the successive turns of the coil. The pipe has, from the inside to the outside, a pressure sleeve (2), a pressure vault (3) containing at least one pressure resistance armor, an intermediate sleeve and at least one traction armor layer (5, 6). The long element coiled to form the drainage layer is a shaped wire or made of a preformed metal sheet or formed by a hoop around the pressure resistance armor. The angle of winding of the long element is greater than 70[deg]. The long element contains transverse hollows spread longitudinally so they are aligned at least partially with another hollow once the coiling is complete, to form transverse drainage channels. The long element has a longitudinal space designed to allow the circulation of gas inside the same turn and is made entirely or partially of polymer material. The drainage layer is made by winding two different long elements.