Flexible unbonded oil pipe system with an optical fiber sensor inside

摘要

The invention relates to an unbonded flexible pipe comprising an internal sheath, at least one armor layer surrounding said internal sheath and a bore defined by said internal sheath, the flexible pipe further comprising a fiber sensor arranged in said bore. By arranging the fiber in the bore of the unbounded flexible pipe, new opportunities for sensing desired properties of the unbounded flexible pipe is provided. The fiber sensor may preferably be a pressure fiber sensor. The unbonded flexible pipe may preferably be an offshore pipe, such as a riser for transportation of hydrocarbons.

主权项

1. An unbonded flexible pipe comprising an internal sheath, at least one armor layer surrounding said internal sheath and a bore defined by said internal sheath, the flexible pipe further comprising a fiber sensor arranged in said bore, the fiber sensor is an optical fiber sensor, wherein a protecting element is arranged around said fiber sensor, said protecting element allowing a liquid fluid and/or gas fluid flowing in said bore to act directly on said fiber sensor, wherein said flexible pipe is a riser.