Establish Compartmentalization in Deep Water

Understand reservoir communication

Reservoir compartmentalization is a major cause of production underperformance in the oil field and needs to be identified to develop a deepwater completion strategy. A well drilled into a compartmentalized reservoir may see only part of the hydrocarbon in place over the production time scale. The obstruction to free flow can be sealing faults, fault baffles, pinching out layers, sand lenses or low permeability areas. Knowing whether the hydrocarbons are contained in one or multiple compartments, and the types of fluid in each compartment,  is critical in determining project economic thresholds.

Identify and quantify compartmentalization

Petroleum reservoirs can consist of flow units or compartments that may range from massive to very small. This heterogeneity does not describe the overall size of the reservoir but it does strongly impact the ability to drain the reservoir. The consequence of not recognizing flow compartmentalization is generally to anticipate more efficient drainage than is actually achieved.

The combined use of all available rock and fluid data is important to be able to apply a comprehensive approach to identifying and quantifying compartmentalization. This includes the analysis of fault distributions based on downhole measurements and 3D seismic fault identification techniques.

Downhole fluid analysis (DFA) is an effective technique to identify compartmentalization based on fluid signature comparisons and fluid density inversions. Further corroboration with geological and petrophysical information helps to confirm the results.

In high-cost operating environments such as deep water, standard well testing techniques may often be impractical and expensive. However, by obtaining a continuous downhole fluids log, a combination of analytical and interpretive techniques using fingerprinting of oils can be applied to determine whether they are part of the same reservoir compartment.

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Fluid Flow and Pressure Data Where Not Previously Possible

Saturn 3D Radial Probe
Recognize variations in reservoir fluid properties by extracting samples from various positions in the formation and conducting downhole fluid analysis (DFA) and pressure testing.
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