WellTest Wizard: Properties

Subtopics:

The Properties dialog box is a step in the Wizard and can be accessed via the Wizard menu. It prompts you to enter the reservoir pressure, temperature, and gravity of the currently selected reservoir fluid type. It is also important to enter properties of other fluids for calculating sandface pressures.

Gas gravity impacts the oil correlations and should be entered for oil wells. To enter properties of the non-primary fluid types, navigate to the Gas Properties, Oil Properties, and Water Properties sub-tabs within the Properties tab and manually enter the properties (outside of the wizard).

Reservoir Temperature and Pressure

The default reservoir temperature is 48.9 C (120 F), but this should be changed to reflect the actual temperature of your reservoir. The default reservoir pressure is the highest measured pressure for drawdown / buildup tests, or the lowest measured pressure for injection / falloff tests in the Production Editor. This default setting is updated automatically after sandface pressures are calculated. If the reservoir pressure is considerably different than the default, an estimate of the reservoir pressure should be specified.

Oil Properties

The oil gravity defaults to 0.88 (30 API), and should be changed to reflect the actual relative density of your reservoir oil. Saturated or undersaturated conditions must be specified to calculate the appropriate fluid properties for your reservoir conditions. The default is undersaturated oil.

Gas Properties

The gas gravity defaults to 0.65, and should be changed to reflect the actual relative density of your reservoir gas. If there is associated condensate production, the gas equivalent of the condensate can be estimated to establish the total gas rate and recombined gas gravity.

Water Properties

The relative density of water defaults to 1.0, and should be changed to reflect the actual relative density of your reservoir water. You must specify the water salinity, and whether or not the water is gas saturated.