Page 33: of Offshore Engineer Magazine (Aug/Sep 2015)

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Geology & Geophysics

The high fold and good repeatability two of the producers with the highest still maintaining good reservoir sweep of the LoFS data helped reduce in-? eld offtake rates exhibited strong softening ef? ciency. These observations supported noise to acceptable levels. The in-? eld anomalies caused by gas saturations of the decision to operate the ? eld at higher noise was from rig activities and some 2-3% due to ? owing bottomhole pres- rates, which provided early economic seismic interference was generated due sures below bubble point. bene? ts.

Shell reports that, beyond to another survey undertaken during the

At a Glance: Shell’s BC-10 key facts 4D, the baseline data will be water? ood monitor.

Location: Campos Basin, Brazil integrated with new directional

Pressure inverted echo sounder instru-

Depth: ~1780m deep-reading resistivity logs ments were converted to connect directly from the lateral sections, as well to the LoFS system for continuous power

Shell 50% (Shell operated), ONGC 27%,

Interests:

Qatar Petroleum International 23% as being integrated with inver- and data transmission and to provide good

Fields: Ostra, Abalone, Argonauta sions for reservoir properties, to water velocity and tidal depth data for build new static and dynamic deepwater statics solutions.

FPSO design 100 kb/d and 50 mscf/d of natural gas models. Broadband processing capacity:

Quick-look results will be used to aid understand-

Despite the short duration between the start ing of the overburden and

BDFT (JV between SBM/MISC), Subsea

Key 7, FMC Technologies, V&M do Brasil, of the water injection and the ? rst seismic analyses of the reservoir depth. contractors: Oceaneering, Transocean/Global monitor survey, significant information

Passive seismic recordings will

Santa Fe, Halliburton was obtained that con? rmed that there was be the subject of further internal

Conclusion no out-of-zone events and that water was research efforts.

injected along the entire length of all later- The 4D seismic endeavor enabled early When asked if this technology will be als. The seismic con? rmed the location of observations that provided critical infor- deployed at similar ? elds, Macke says: early water production in two wells and that mation to Shell, which led to optimized “The LoF 4D was a cost-effective solu- no water ? ngering from injectors to produc- well-production rates during the early tion for BC-10, and our learnings from ers was observed. life of the ? eld. The data con? rmed Brazil can be used elsewhere, if deemed

Speci? cally, long, narrow hardening the absence of water ? ngering, which appropriate for development plays in signatures along each injector indicated increased con? dence for the contin- other regions.” the successful injection of water along ued similar and enhanced operation of the entire length of the more than 1000m the ? eld, and allowed higher offtake Based on a Shell interview and Shell’s laterals. Also, the 4D survey showed that rates of the relatively viscous oil while whitepaper, OTC-25803-MS.

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DELMAR www.delmarus.com • [email protected] oedigital.com August 2015 | OE 35 032_OE0815_G&G1_Jeannie.indd 35 7/21/15 9:40 PM