New PVT analysis opportunities
Accurate compositional and PVT analysis of a formation sample requires that the recovered sample remain in downhole formation conditions. Pairing the Oilphase-DBR Single Phase Multisample Chamber with the multisample module of the MDT modular formation dynamics tester is the answer.
The chamber enables overpressuring the samples after they’re removed from the reservoir. Sample chambers are pressurized across two pistons with a nitrogen gas chamber. Overpressuring compensates for the temperature-induced pressure drop as the samples are returned to surface.
A PVT-quality single-phase fluid sample established the presence of producible hydrocarbons for a North Sea operator. This test occurred in a fault block characterized by partially consolidated formation, miscible drilling fluid invasion, and water saturations from 40% to 50%. The MDT tool, run with the Single-Phase Multisample Chamber, recovered two low-contamination monophasic samples.
The operator estimated recoverable reserves accurately with these high-quality samples. Also, monophasic PVT analysis offered the critical parameters for optimal completion and production design. MDT single-phase formation samples gave the necessary answers without the additional expense and environmental issues of drillstem tests.
Benefits
- New PVT analysis opportunities
- Asphaltene deposition
- Aquifer sampling for corrosion studies
- Monophasic sample handling tolerant of leaks and partial transfer
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