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Question 1 Figure 2 shows a suite of capillary pressure data during drainage and imbibition. After primary drainage, the imbibition and secondary drainage curves were measured on a core that had been aged in the reservoir crude oil at reservoir temperature and pressure for 4 weeks, and the measurements were obtained at reservoir conditions. 1) Identify and label the primary drainage, secondary drainage and imbibition curves. Use arrows to show the direction of saturation change on each curve. 2) From the graph, estimate $S_{wirr}$ after primary drainage, $S_{wirr}$ after secondary drainage, and $S_{or}$ 3) Estimate the saturations at which the imbibition and secondary drainage curves cross the x-axis 4) From these saturation estimates, calculate the Amott wettability index. 5) Is the plug oil-, intermediate/mixed- or water-wet?

          Question 1
Figure 2 shows a suite of capillary pressure data during drainage and imbibition. After primary
drainage, the imbibition and secondary drainage curves were measured on a core that had
been aged in the reservoir crude oil at reservoir temperature and pressure for 4 weeks, and
the measurements were obtained at reservoir conditions.
1) Identify and label the primary drainage, secondary drainage and imbibition curves. Use
arrows to show the direction of saturation change on each curve.
2) From the graph, estimate $S_{wirr}$ after primary drainage, $S_{wirr}$ after secondary drainage, and
$S_{or}$
3) Estimate the saturations at which the imbibition and secondary drainage curves cross the
x-axis
4) From these saturation estimates, calculate the Amott wettability index.
5) Is the plug oil-, intermediate/mixed- or water-wet?

Question 1
Figure 2 shows a suite of capillary pressure data during drainage and imbibition. After primary
drainage, the imbibition and secondary drainage curves were measured on a core that had
been aged in the reservoir crude oil at reservoir temperature and pressure for 4 weeks, and
the measurements were obtained at reservoir conditions.
1) Identify and label the primary drainage, secondary drainage and imbibition curves. Use
arrows to show the direction of saturation change on each curve.
2) From the graph, estimate Swirr after primary drainage, Swirr after secondary drainage, and
Sor
3) Estimate the saturations at which the imbibition and secondary drainage curves cross the
x-axis
4) From these saturation estimates, calculate the Amott wettability index.
5) Is the plug oil-, intermediate/mixed- or water-wet?

Added by Kristy O.

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