Schlumberger Technology Corporation

Paul Frederick Cilgrim Dickenson

Ashley Bernard Johnson

Arthur H Hartog

Gareth P Lees

Cheng-Gang Xie

Gary Martin Oddie

Gokturk Tunc

Colin Allan Wilson

Andrew Meredith

Paul Simon Hammond

Michael Paul Barrett

Peter C Wait

Franck Bruno Jean Monmont

Theo Cuny

Caroline Humphrey

Jakub Szypicyn

A system and technique for obtaining two or more distributed measurements from an optical sensing fiber deployed along a desired measuring path are disclosed. Interrogating probes from two or more different distributed measuring systems are combined and launched into the sensing fiber. Backscattered light generated in response to the combined interrogating probes is separated into portions and each portion is provided to a respective distributed measuring instrument. In this manner, distributed measurements corresponding to different parameters of interest, such as temperature and pressure, along the measuring path can be measured simultaneously using the same sensing fiber.

Simultaneous distributed measurements on optical fiber

The operation of rotary equipment carried on elongate structure such as coiled tubing extending into a borehole from the Earth's surface is carried out by providing at least one optical fibre extending downhole to the rotary equipment from the surface, using optical time domain reflectometry to operating the optical fibre as a distributed vibration sensor while the rotary equipment is in operation, and thereby observing vibration created by the rotary equipment.

Observation of vibration of rotary apparatus

Monitoring one or more items of equipment associated with a borehole or other conduit. A sensor system includes a vibration sensor for sensing vibrations at one or more sensor locations associated with one or more items of the equipment and/or the borehole or other conduit. A processing system processes the sensor information to determine a characteristic of the operation of the one or more items of equipment and/or the borehole or other conduit.

Monitoring of equipment associated with a borehole/conduit

A system and method for simultaneously addressing multiple parallel distributed fiber optic sensors using a single interrogation instrument is disclosed. One or more of the fiber optic sensors are provided with a non-reflective delay element to prevent an overlap in time between backscatter returns from the distributed fiber optic sensors, thereby allowing the backscatter returns from each sensor to be distinguished based on round-trip transit time.

Multifiber interrogation with reflectometry techniques

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Romsey, United Kingdom

Paul Frederick Cilgrim Dickenson