Research Article
Predicting the Viscosity of Petroleum Emulsions Using Gene Expression Programming (GEP) and Response Surface Methodology (RSM)
Table 3
Analysis of variance (ANOVA) for emulsion viscosity.
| Source | Sum of squares | Df | Mean square | -ratio | -value |
| A:time (days) | 35219.0 | 1 | 35219.0 | 463.92 | 0.0000 | B:oil viscosity (cP) | 1678.34 | 1 | 1678.34 | 22.11 | 0.0000 | C:water viscosity (cP) | 1.72024 | 1 | 1.72024 | 0.02 | 0.8805 | D:water cut (v/v%) | 16900.1 | 1 | 16900.1 | 222.62 | 0.0000 | E:amount of solids (wt%) | 22750.1 | 1 | 22750.1 | 299.68 | 0.0000 | AA | 63.0 | 1 | 63.0 | 0.83 | 0.3636 | AB | 146.72 | 1 | 146.72 | 1.93 | 0.1663 | AC | 1.72024 | 1 | 1.72024 | 0.02 | 0.8805 | AD | 750.149 | 1 | 750.149 | 9.88 | 0.0020 | AE | 132.149 | 1 | 132.149 | 1.74 | 0.1888 | BB | 336.667 | 1 | 336.667 | 4.43 | 0.0367 | BC | 70.7232 | 1 | 70.7232 | 0.93 | 0.3358 | BD | 1674.01 | 1 | 1674.01 | 22.05 | 0.0000 | BE | 19.7232 | 1 | 19.7232 | 0.26 | 0.6109 | CC | 17.04 | 1 | 17.04 | 0.22 | 0.6363 | CD | 3118.58 | 1 | 3118.58 | 41.08 | 0.0000 | CE | 808.938 | 1 | 808.938 | 10.66 | 0.0013 | DD | 769.056 | 1 | 769.056 | 10.13 | 0.0017 | DE | 2100.22 | 1 | 2100.22 | 27.67 | 0.0000 | EE | 139.286 | 1 | 139.286 | 1.83 | 0.1774 | Total error | 12753.8 | 168 | 75.9156 | | | Total (corr.) | 99359.9 | 188 | | | |
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