Permanently Installed Fiber Optic Multi-Station 3-C In-Well Seismic Trial at Izaute Field

Bostick, F. X.; Knudsen, Sverre; Nakstad, Hilde; Blanco, Jacques; Mastin, Eric

doi:10.3997/2214-4609-pdb.6.f45

Cited by 10 publications

(1 citation statement)

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“…This kind of seismic acquisition allows for full freedom in azimuth and offsets, giving a high-fold multi-and wide-azimuth dataset ready for processing and interpretation. In-well fibre optic sensors for measuring flow rates, pressures, temperatures and for VSP applications have previously been developed and tested (Bostick et al, 2003, Keul et al, 2005and Hornby et al, 2007.The low power loss and large bandwidth of optical fibres enable extremely high data transmission rate over long lead-in cables and is certainly an advantage when the field is operated from sub-sea installations and the platform may be several kilometers away from the producing wells. Reliability over time is possibly the most important feature in order to keep the total cost over the years of operation as low as possible.…”

Section: Introductionmentioning

confidence: 99%

Fiber Optic Permanent Seismic System for Increased Hydrocarbon Recovery

Langhammer¹,

Eriksrud²,

Nakstad³

et al. 2009

11th International Congress of the Brazilian Geophysical Society &Amp; EXPOGEF 2009, Salvador, Bahia, Brazil, 24-28 August 2009

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Permanent seismic installations at the sea-floor have emerged as a potential tool for oil companies in their work to actively monitor oil/gas flows and injection processes in order to increase hydrocarbon recovery and optimize production. The advantage of fibre optic over electric sensors is that the fibre optic sensor technology is completely passive at the wet-end, i.e. no short circuits will happen, longer lifetime of components, high sensitivity, high dynamic range, less intrinsic noise, no corrosion of sensing components, fewer parts and potentially cheaper complete receiver systems. Large fibre optical ocean-bottom receiver systems for 4Dapplications, can now be produced and installed at locations where the oil companies would like to exploit the life-of-field seismic concept. Optoplan has been awarded the world's first commercial contract for a fibre optic ocean bottom seismic cable system for permanent reservoir monitoring at the Ekofisk field in the North Sea. An area of 60 sq. km of the seabed will be covered by four component sensors in 2010. The system consists of i) a top-side (platform) laser interrogation and recording system, and ii) a wet-end system including 200 km of seismic cable with 4000 sensor stations, each containing 4 fibre Bragg grating (FBG)-based interferometric sensors (three accelerometers and one hydrophone). The in-sea installed system includes 24000 FBGs and more than 3500km of optical fibres, and is probably the largest single fibre optic sensor network ever made. The system is designed to operate with ultra-high reliability sub-sea for more than 25 years, and has been qualified through a series of field test installations. The system is expected to significantly enhance the oil and gas recovery of the Ekofisk field. We are advocating optical sensing technology to be an important part of the tool box for the oil companies in their work to implement the instrumented oil field in a cost efficient way.

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Section: Introductionmentioning

confidence: 99%