By M. A. Lovell
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375 should any difference be seen, as this is the percolation threshold for oil-wet pores. 5). A continuous oil-wet cluster from the surface is also essential for oil imbibition during stage four of the cycle: no imbibition of oil is observed 26 S. R. M c D O U G A L L E T for a ' = 0 . 313 as expected. 375, however, the extent of oil imbibition increases rapidly, as the oil-wet pores aggregate to form larger spanning clusters. 0 Sw (a) 2500 | 20001 15oot looot t • t ,oot b. ,. 0 ..... 4 ] • PD o s WI WD a OI I:!
These results, when viewed in light of the earlier theoretical discussion, may go some way towards a clearer interpretation of many contradictory experimental results of the past. Jadhunandan (1990) has reported similar experimental trends from cores aged using various brines at 26°C (Fig. 13). 00 Thet~ ¢~t%. 1 r~tL0. c ~u 4u bo 80 100 R R (b) (d) Fig. 10. Distribution of water- and oil-filled pores at residual oil; the water-filled pores are shown shaded for each contact angle range; (a) O = 0 °, (b) 0 = 0-45 °, (c) 0 = 0-60 ° (d) O = 0-90 °.
Branch and node chart representation of the connectivity of the mesoscopic network of interconnecting melt channels shown in Figs 3 and 4. The chart is defined by three networks and has a genus (G) of 3. The generalised tortuosity (T) of each network is shown above the chart for comparison. 08. porosity systems (~ << 1), n usually lies between 2 and 3 while b is partly related to the tortuosity of the system. Porosity estimates from Fig. 4 were used to obtain permeability ranges for the enclave s h o w n graphically in Fig.
Developments in petrophysics by M. A. Lovell