RwCore™ is a quick, nondestructive, accurate
method for determining formation water resistivity (Rw).
Uncomplicate the core Rw measurement. Much uncertainty
can exist in reserves determination in the Rw variable alone, particularly in reservoirs
that don't produce water. Core-based Rw methods have
included direct measurement on water produced by centrifugation or ionic speciation
after distillation and leaching and subsequent conversion to resistivity.
RwCore™ is a new and improved resistivity-based
method that provides rapid Rw determinations on fresh
or preserved core samples.
The RwCore™ model was developed experimentally
and was laboratory-tested extensively prior to implementation. The data on the right
illustrate one such experimental sequence. A suite of core samples was saturated
with carefully prepared brines of known resistivity and were tested on a blind basis.
These data illustrate the accuracy and the measurement range of the RwCore™
This data comparison illustrates RwCore™ compared to traditional "ionic speciation"
which is rather time-consuming and requires sample destruction. The experimental
variation, although acceptable, is predominantly attributed to ionic speciation.
RwCore™ is ideally suited for shale reservoirs:
RwCore™ provides formation water resistivity from core, cuttings,
and liquids using resistivity-based measurements.
Example Data Set