Weatherford/lamb, Inc.

Minnesota Mining and Manufacturing Company

Weatherford Technology Holdings, LLC

Andrew S Kuczma

Edward Michael Dowd

Brian J Pike

Paul Eric Sanders

David Labella

Martin A Putnam

James R Dunphy

Trevor Wayne MacDougall

Domino Taverner

John J Grunbeck

Thomas Wolfgang Engel

Stefan A Babirad

Francis X Bostick, Iii

Mark William Baker

David LaBella

Francis X Bostick

Joseph J Baraglia

Jerald K Rasmussen

Larry R Krepski

Steven M Heilmann

Patricia M Savu

Robert E Buxbaum

Fredrick Bacon

Trevor W Macdougall

Francis X,iii Bostick

Robert Buxbaum

Iii Francis X Bostick

Francis X Bostick Iii

Methods and apparatus for performing Distributed Acoustic Sensing (DAS) using fiber optics with increased acoustic sensitivity are provided. Acoustic sensing of a wellbore, pipeline, or other conduit/tube based on DAS may have increased acoustic sensitivity through fiber optic cable design and/or increasing the Rayleigh backscatter property of a fiber's optical core. Some embodiments may utilize a resonant sensor mechanism with a high Q coupled to the DAS device for increased acoustic sensitivity.

Fiber optic cable for distributed acoustic sensing with increased acoustic sensitivity

The present invention provides a method for making a multicore large diameter optical waveguide having a cross-section of at least about 0.3 millimeters, two or more inner cores, a cladding surrounding the two or more inner cores, and one or more side holes for reducing the bulk modulus of compressibility and maintaining the anti-buckling strength of the large diameter optical waveguide. The method features the steps of: assembling a preform for drawing a multicore large diameter optical waveguide having a cross-section of at least about 0.3 millimeters, by providing an outer tube having a cross-section of at least about 0.3 millimeters and arranging two or more preform elements in relation to the outer tube; heating the preform; and drawing the large diameter optical waveguide from the heated preform. In one embodiment, the method also includes the step of arranging at least one inner tube inside the outer tube.

Method for making large diameter multicore optical waveguide

Methods and apparatus provide for birefringent waveguides suitable for optical systems exhibiting polarization dependence such as interferometer sensors including Sagnac interferometric fiber optic gyroscopes (IFOG). The waveguides, for some embodiments, may offer single polarization performance over lengths of about a kilometer or more due to polarization dependent attenuation. According to some embodiments, the waveguides incorporate a pure silica core for resistance to radiation-induced attenuation (RIA).

Pure silica core, high birefringence, single polarization optical waveguide

A method and apparatus for reducing the thermal induced errors in an IFOG system. The apparatus including a highly thermally conductive material configured to encapsulate a waveguide of an interferometric fiber optic gyroscope (IFOG). The highly thermally conductive material more evenly distributes thermal changes encountered by a sensing coil of the IFOG thereby substantially reducing errors in the IFOG system.

Optical fiber coating system and monitoring method for improved thermal performance in fiber optic sensors

Method for making large diameter optical waveguide having Bragg grating and being configured for reducing the bulk modulus of compressibility thereof

The present invention generally provides a hydrogen gettering agent containing a fullerene compound, a protected optical fiber cable containing the hydrogen gettering agent and a method of making the same. According to some embodiments, the protected optical fiber cable is provided comprising a protective sheath, at least one optical fiber positioned within the protective sheath, and the hydrogen gettering agent surrounding the at least one optical fiber within the protective sheath.

Protected optical fiber cable and hydrogen gettering agent

The present invention provides a curable coating composition comprising at least one fluorinated monoacrylate monomer, at least one polyethylenically unsaturated fluorinated crosslinking monomer different from the acrylate monomer, and at least one adhesion promoting monomer different from any other monomer in the composition of matter, which preferably is a fluorinated acrylamide silane. Optionally, fluorinated acrylamide silane monomers, non-fluorinated mono- or polyethylenically unsaturated monomers, or non-fluorinated silane adhesion promoting monomers may be added. The free radical polymerization product of the aforementioned coating composition provides a novel cladding material for optical fibers. The optical fibers of the invention can be used as waveguides in communications and laser delivery systems.

Low loss high numerical aperture cladded optical fibers

The present invention provides novel silyl 2-amidoacetates and silyl 3-amidopropionates which are the reaction products of azlactone and silanol reactants. The novel products result from nucleophilic addition of a soluble or insoluble, low or high molecular weight reactant containing one or more silanol groups and a soluble or insoluble, low or high molecular weight reactant containing one or more azlactone groups. The reaction products provide for high adhesion between the siliceous and azlactone reactants, as would be useful as protective coatings particularly on silicon-containing materials. It has been recognized in the present invention that silyl 2-amidoacetates and silyl 3-amidopropionates are useful linkages between silanol and azlactone derived materials.

Silyl 2-amidoacetate and silyl 3-amidopropionate compositions and

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Clinton, CT, United States of America

Andrew S Kuczma