Page 30: of Offshore Engineer Magazine (Jan/Feb 2020)

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Drilling & Completions FEATURE FEATURE Drilling & Completions

Silixa uses ? bre optic for well surveillance.

Source: Silixa ful, enabling quanti? able data, says Silixa’s Vero Mahue. Fi- vertical seismic pro? le (VSP) data for clients. It’s cheaper than ber can be used for wellbore leak detection, production and using ocean bottom nodes (OBN) as well as offering a per- injection pro? ling and for seismic data acquisition she says, manent broadband sensor downhole for time-lapse surveys alongside other downhole measurement applications. Silixa’s with which you can measure other processes in the well, such

Carina system, using engineered Constellation ? ber, is able to as the impact of water ? oods, gas lift or in? ow control valves, detect sound 20 decibels (dB) below DAS based on standard says J.Andres Chavarria, from OptaSense. “The beauty of ? - ? bers, making it sensitive to even small leaks in a wellbore. By ber is you get to see the entire dynamic across the entire well,” also measuring speed of sound with the ? ber and applying he says. “Fiber is sensitive to acoustics and temperature; DAS

Doppler-shift analysis, a ? ow velocity pro? le of the whole well is very accurate with ? ne spatial resolution. When you couple can be derived, she says, offering quanti? able information, not that to ? ow velocity measurements for each injection point, just qualitative. By measuring speed of sound, it can also de- we start to build a model of how reservoir production is im- termine what’s ? owing through the well and gas/oil interfaces – liquid or gas (as sound travels faster through liquid than gas).

OptaSense

OptaSense, a QinetiQ company, has been deploying ? ber optic DAS technology to gather permanent ? ow, seismic and

Resman’s tracer technology is installed in the completion

Source: OptaSense

OptaSense has been deploying ? ber optic DAS tech to gather to provide information about permanent ? ow, seismic and vertical seismic pro? le (VSP) data. wellbore ? ow. 30 OFFSHORE ENGINEER OEDIGITAL.COM OEDIGITAL.COM