Bouncing Off the Ceiling

Biosteering, a Pilot Study is Necessary

Prior to using biosteering, a pilot study is necessary to establish the reservoir layering and to identify the target reservoir package.

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Prior to using biosteering, a pilot study is necessary to establish the reservoir layering and to identify the target reservoir package.

The pilot study gives engineers confidence in the non-pay units, such as mudstones in a clastic reservoir, so the optimum well path can be mapped within the reservoir package between the non-pay zones.

"Biostrat identifies mudstone and siltstones — the non-pay units," said Simon Payne, biostrat network co-leader for BP in Aberdeen, Scotland.

"During drilling of high-angle and horizontal wells everybody is happy when the well is in the sands," he continued, "but when the well hits a non-pay zone the biostrat expert is key to determining if the well is in the roof or the floor of the reservoir zone.

"Essentially we are bouncing off the floor and ceiling of the reservoir. Features like sub-seismic faults can throw a well way out of the reservoir package, and you have to know how to steer to get back into the reservoir."

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