There are substantial enhancements to all Ecrin modules in v4.20.
One of the main areas of development has been unconventional resources,
in particular shale gas, with additional diagnostic tools in Topaze NL,
specifically adapted internal analytical models in Saphir NL and Topaze
NL, and substantially enhanced numerical models in Saphir NL, Topaze
NL and Rubis.
Other improvements include slug test and minifrac analysis in Saphir NL,
additional analysis tools in Topaze NL, an improved Rubis sector to PTA
where the dynamic state of the simulation is transferred to Saphir NL and
a prediction of future IPR’s in Amethyste that is now a free add-on to other
Two new additional modules, as yet non-commercial, for thermal modeling
and surface networks have been included for evaluation.
A full technical description with a list of all new features is available for
download from http://www.kappaeng.com/ecrin420.pdf
Minifrac analysis in Saphir
Substantial work was done on the numerical model,
especially for the modeling of unconventional
resources. Intermediate 3D local grid refinement has
been created to account for vertical flow in Topaze NL
without the detail of the transient analysis grid. The
gridding is not only adjusted to the flow geometry,
but also to the reservoir diffusivity, providing superfine
grids for extremely low permeability. Fractured
horizontal wells now include limited entry fractures. For
unconsolidated formations there is individual control
of matrix and fracture pressure dependence.
On the analytical side, Saphir NL and Topaze NL now
integrate a comprehensive internal model for multiple
fracture horizontal wells, including enhanced features
such as a global fracture angle and composite zones.
In the multilayer models, vertical crossflow can now be
modeled with a leakage factor or a thin interface layer.
Minifrac analysis has been added in Saphir NL.
This includes G-function, square root plot and the
After Closure Analysis (ACA) plot. Slug / pulse test
analysis has been added, allowing the initial DST
slugs to be analysed. Perrine’s method has been
improved to handle multiphase analyses (Kamal et
al.). Deconvolution is enhanced by adding a material
balance correction (Levitan et al.).
In Rubis the extraction of a sector for pressure transient
analysis now sends to Saphir NL the exact dynamic
state of the simulation at the time of the extraction. It
is no longer necessary to create a different initial state
in Saphir NL. Direct import from Geomodelers now
include net-to-gross ratio, and the volume averaging
interpolation method has been modified to improve
the property mapping between the imported grid and
the Rubis cells. Finally, unconsolidation has been
extended from Saphir NL and Topaze NL to Rubis.
In Topaze NL new specialized plots have been added,
including the square root and power law loss ratio
plots for unconventional formations. Specialized lines
on the loglog plot, already in Saphir NL, are now also
available in Topaze NL. New corrections and display
capabilities have been added to existing specialized
plots, in particular to the p/Z plots.
Amethyste is now a free add-on of Saphir NL, Topaze
NL, Rubis and Emeraude licenses under active
maintenance according to our current price list. The
main development here is the prediction of future IPR.
Also new to v4.20, on an experimental basis and
for evaluation purpose only, is a first version of a
thermal model and a surface network. These are noncommercial.
In the future they may be removed or
packaged in additional Ecrin modules…
Not detailed here are more than forty additional
improvements, most of them coming from the requests
of our user groups. Among them, the Span & Wagner
EOS for pure CO2, a faster USB protection key, RAM
monitoring, an XML section in the Ecrin files allowing
the direct reading of the main results from third party
software, preconfiguring our coming OpenServer.
Multi fractured horizontal well model
Superimposing flowing and dynamic balance in Topaze
Injection / warmback simulation in Rubis