Shell Oil Comapny

William Birch

Johannis Josephus Den Boer

Jeremiah Glen Pearce

Albena Alexandrova Mateeva

Jorge Louis Lopez

Boris Nikolaevich Kuvshinov

Jeffery Joseph Mestayer

Johan Cornelis Hornman

Matheus Norbertus Baaijens

Kari-Mikko Jääskeläinen

Andre Franzen

Arthur Alexander Van Rooyen

Kees Hornman

Crispin Thomas Matthew Doyle

Christopher Barry Staveley

A distributed fiber optic acoustic sensing system includes a cable having a cable length. The cable has an elongated body having an outer surface, and at least one straight optical fiber extending parallel to a longitudinal axis of the cable along the cable length; and one or more non-straight optical fibers, such as two orthogonal sinusoidal optical fibers extending along the cable length, or a helically wrapped optical fiber extending along the cable length. The sensing system further has light transmitting and receiving means optically connected to the optical fibers.

Detecting broadside acoustic signals with a fiber optical distributed acoustic sensing (DAS) assembly

A cost efficient and pressure resistant system for interconnecting fiber optical cables in-situ at a hydrocarbon fluid production facility comprises:&#x2014;a pressure resistant light transparent window ();&#x2014;a first lens system (A-C), which is arranged at one side of the window and configured to convert a first light beam transmitted through a first fiber optical cable (A-C) into a collimated light beam (A-C) that is transmitted through the window; and&#x2014;a second lens system (A-C), which is arranged at an opposite side of the window and configured to receive and reconvert the collimated light beam into a second light beam that is transmitted into a second fiber optical cable (A-C).

Interconnecting optical fibers at a hydrocarbon fluid production facility

A method of distributed acoustic sensing includes providing a fiber optic distributed acoustic sensing system having a cable. A straight optical fiber extends parallel to a longitudinal axis of the cable along the cable length. A helically wrapped optical fiber extends along the cable length. The method includes transmitting optical signals into and receiving backscattered signals out of the optical fibers consisting of a component of said optical signals which component has been backscattered from impurities or inhomogeneities in the optical fibers, observing changes in the backscattered signals caused by axial stretching and compressing of the optical fibers caused by an incident wave, comparing the backscattered signals of the straight optical fiber and the helically wrapped fiber, and determining, based on the comparing of the backscattered signals, a direction of wave propagation of the incident wave with respect to the fiber axis for detecting broadside waves and axial waves distinguishably.

A distributed fiber optic acoustic sensing system comprises an elongate body having an outer surface, an optical fiber disposed on the outer surface at a first predetermined wrap angle, and light transmitting and receiving means optically connected to the fiber for. The elongate body may include at least one substantially flat face, and/or a layer of swellable elastomer surrounding the body, and/or an outer elastomeric tube surrounding the elastomer layer. There may be at least one sensor pad disposed in the outer layer, the sensor pad comprising a stiffener and at least one longitudinal fiber affixed thereto or embedded therein. There may be a body of protective material surrounding the tube, which may have an outer surface that includes at least one substantially flat face and at least one sensor pad disposed in the body.

Detecting broadside acoustic signals with a fiber optical distrubuted acoustic sensing (DAS) assembly

To protect a hydraulic, electric and/or other conduit in an annular space around a well casing against damage from perforating and other well operations the conduit is arranged in a groove in a U- or V-shaped protective gutter, which is secured to the outer surface of the well casing and which is capable of deflecting a shaped charge.

Method and system for protecting a conduit in an annular space around a well casing

A pressure sensor assembly comprises a sensor housing having a flexible wall that is configured to deform in response to a pressure difference between the interior and exterior of the sensor housing; -a first fiber optical cable section that is bonded to the flexible wall of the sensor housing such that the length of the first fiber optical cable section changes in response to deformation of the wall in response to the said pressure difference; a second fiber optical cable section which is bonded to a thermal reference body, which body is connected to the sensor housing by a strain decoupled connection mechanism, such as a tack weld or flexible glue, and is configured to deform substantially solely in response to thermal deformation, such that the length of the second fiber optical cable section solely changes in response to thermal deformation of the thermal reference body.

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Aberdeen, United Kingdom

William Birch