Sendra is, as most commercial reservoir simulators, based on fully implicit black oil formulation. A reservoir simulator is basically developed for field purposes with a number of options for field applications, which are quite irrelevant for laboratory applications. Sendra is tailor made for special core analysis and it includes options necessary for laboratory application. The core geometry and physical properties are very easy to handle. Sendra avoids limiting assumptions, such as zero capillary pressure and homogeneous core samples made by analytical method. Consequently, Sendra provides for an excellent means of quality control of analytical methods. Even though Sendra is an advanced and flexible simulation tool within special core analysis, the user friendliness is maintained through a well arranged user interface.
Sendra can handle unsteady-state experiments, steady-state experiments and centrifuge experiments. This means that Sendra can deal with all available standard type experiments within special core analysis. It is well known that a number of correlations for flow properties – Relative permeability and Capillary pressure - are proposed in the literature to describe the multi-phase flow properties of relative permeability and capillary pressure. Sendra includes the most common and widely used correlation in addition to tabular values.
Below is a list of all flow scenarios that can be handled in Sendra. As can bee seen, Sendra covers all common experimental techniques performed by the industry.
- Unsteady-state
- Single rate with or without rate-bump at the end
- Steady-state
- Injection of two-phases simultaneously
- Centrifuge
- Multi-speed (several RPMs for Pc)
- Single-speed (one RPM for kro)
- Injection with constant rate
- Injection with constant DP
- Combination of various scenarios
- Low rate-high rate; steady-state-unsteady-state, multi-scenario
- Imbibition and drainage
- Oil-water; Gas-oil/water (incl. a third stagnant phase)
As representation of Relative permeabilities and Capillary pressure are important for the industry, please find below a list of the models presently available in Sendra.
Relative permability
- Tabular values
- Burdine
- Corey
- Sigmund & McCaffery
- Chierici
- LET
Capillary pressure
- Tabular values
- Skjæveland
- Burdine
- Bentsen & Anli
- LET for primary drainage, imbibition and secondary drainage