–September 19, 2017
1515 Poydras St.,
5th Floor Conference room,
11:30 – 1:00 pm
or email Elizabeth Tanis (Elizabeth.Tanis@shell.com) with RSVP
Member fee is $24
Non-member fee is $36
CT Scanning – Millimeter-Scale Log for Cored Intervals
Presented By: AJ Kumar
Houston, Texas, USA
non-destructive screening using high-definition imaging techniques now provides
a viable solution for superior visualization and detailed quantitative core
assessment. These detailed deliverables are available before the core is
removed from the inner core barrel and other measurements are commenced. X-ray
scanners, popularly known as Computed Tomography (CT) scanners are used for
such qualitative and quantitative description of cores. Similar to medical
applications, CT scanners are used to capture the entire three-dimensional
aspect of rocks when they arrive from wellsite.
scanning is performed early-on, before cores are extruded and handled, making
it indispensable from a reservoir state preservation perspective. This digital
preservation helps in visualization and assessment of cores at any point in
time, months or years after the cores are acquired.
and advanced CT scanners have capabilities to quickly scan objects at more than
one energy level. Dual Energy CT scanning of cores provides information on
density and atomic number at a millimeter-scale, vertically. When combined with
extensive laboratory physical measurements, high-resolution bulk density and
photoelectric factors are quantified. Unique cluster analysis of these data
combined with core databases encompassing global lithotypes, result in a solid
interpretation of core mineralogy and therefore, a mineralogy log for the cored
intervals. Availability of vast core data enables robust empirical approach of
quantification of strength profile and dynamic mechanical properties at
millimeter-scale for the cored intervals. Strength index at such high
resolution, in conjunction with CT-based acoustic velocities helps quickly
assess and refine lateral landing zones in a well.
applications of dual energy CT include, detailed fracture description,
orientation of cores without physically scribing cores, enhanced sub-sample
selection, porosity etc. They are also used to correct downhole logs where
resolution is typically coarser than what’s captured with CT.
The early time
capture of data and quick interpretation of properties via these methods make
dual energy CT scanning of cores, a vital part of core analysis programs.