Shell Oil Comapny

Daniel Joinson

Johannis Josephus Den Boer

Andre Franzen

Johannes Maria Vianney Antonius Koelman

Jeremiah Glen Pearce

Peter Berkeley Wills

Menno Mathieu Molenaar

Kari-Mikko Jääskeläinen

Arthur Alexander Van Rooyen

Paul Gerard Edmond Lumens

Barbara Ellen Cox

Alex Groen

A method for determining the physical location of a fiber optic channel in a fiber optic cable comprises the steps of a) providing at least one location key having a known physical location, b) establishing the location of the location key with respect to the fiber optic channel, and c) using the location information established in step b) to determine the physical location of the channel. The location key may comprises an acoustic source, a section of fiber optic cable that is acoustically masked, or at least one magnetic field source and step b) comprises using a Lorentz force to establish the location of the magnetic field source with respect to the fiber optic channel.

System and method for making distributed measurements using fiber optic cable

The spatial resolution of a fiber optical Distributed Acoustic Sensing (DAS) assembly is enhanced by:

Method and system for enhancing the spatial resolution of a fiber optical distributed acoustic sensing assembly

A distributed acoustic sensor, comprises a housing having a longitudinal bore therethrough, an optical fiber supported in the bore; and an inertial member supported within the bore, wherein the fiber is mechanically coupled to the inertial member. The inertial member may include a weight and may provides isotropic stiffness such that it deforms more readily in a first direction normal to the bore than it does in a second direction that is normal to both the bore and the first direction. The sensor may include a plurality of axially-spaced centralizers in the bore, and at least one of the inertial member and the centralizers may comprise swellable material.

Fiber optic cable with increased directional sensitivity

The location of one or more fiber optic channels () along the length of a fiber optic cable () is determined by: a) arranging an electrical conductor and a magnetic source at a known location adjacent to at least one of the channels (); b) transmitting an electrical current through the electrical conductor, thereby deforming the electrical conductor by Lorenz forces in the vicinity of the magnetic source; c) conveying the deformation of the electrical conductor to deform an adjacent channel (); d) transmitting light pulses through the fiber optic cable () and using variations in the light pulses back reflected by the deformed channel () and the known location of the magnetic source to determine the location of the deformed channel ().

Method and system for determining the location of a fiber optic channel along the length of a fiber optic cable

A system for monitoring subsidence and/or rising of a waterbottom has string of pressure sensors along the interior of a sealed -protective tube(q&#x2212;) that rests on the waterbottom and is filled with a low pressure liquid, so that any subsidence and/or rising of the can be deduced from subsidence and/or rising of a section of the tube and associated pressure variations measured by the sensors due to variation of the hydrostatic fluid pressure of the liquid in the of the tube. The tube interior is divided into segments by valves during descent to protect the sensors against hydrostatic pressure of the liquid within the tube during installation. The use of a low pressure liquid in the tube allows the use of sensitive pressure sensors which are able to monitor pressure variations of &#x2212;0.001 Bar associated with a waterbottom subsidence of &#x2212;1 cm, at a water depth of &#x3e;km where the ambient water pressure may be &#x3e;100 Bar.

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Rijswijk, Netherlands

Daniel Joinson