Using Chemicals to Optimize Conformance Control in Fractured Reservoirs Page: 14 of 21
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Then, oil was-injected into the core to measure the oil residual resistance factor, Frro. The core
was scanned again after the oil injection to visualize the oil pathways after gel. Next, brine was
injected to measure the water residual resistance factor, Frrw. Finally the core was scanned after ,
the brine injection to visualize the water pathways after gel. Table 1 shows that the gel reduced
the permeability to water 81 times more than that to oil (FrrW/Frro=81).
Table 1. Summary of residual resistance factors
Core: strongly water-wet Berea
Gel: 0.5% HPAM, 0.0417% Cr(III)-acetate, 1% NaCl, 0.1% CaCl2
kw, ind Frrw Frro FrrwFrro
700 1,220 15 .81
As shown in Fig. 9, the image was cropped into a rectangular block of 4.6 mmx4.6 mmx3.25
mm to eliminate the artifacts created by a thin layer of epoxy coating on the surface of the core.
Fig. -10 is a 3-dimensional view of the rectangular block. As illustrated in Fig. 10, the CMT has
high enough resolution to clearly distinguish rock grains from pore space. Also, this technology
is non-destructive and therefore can be used to monitor changes in fluid saturations and
distribution at different stages of coreflood experiments. Software tools are available to digitally
quantify the pore size distribution and fluid saturations from the images generated by the CMT.
Also available are software tools that can reconstruct fluid pathways. We will report results from
the digital image analysis in the near future.
X=4.6 mm, Y=4.6 mm, Z=3.25 mm
4.6 mm Z
y E 3:25 mm
Top View 3-D View
Fig. 9-Dimensions of the cropped image block.
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Seright, Randal S. Using Chemicals to Optimize Conformance Control in Fractured Reservoirs, report, April 19, 2000; Tulsa, Oklahoma. (https://digital.library.unt.edu/ark:/67531/metadc702203/m1/14/: accessed May 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.