Page 75 - Enhanced Oil Recovery in Shale and Tight Reservoirs

62 Enhanced Oil Recovery in Shale and Tight Reservoirs

rule-of-thumb was used in the industry. Partz et al. (1989) evaluated this
rule-of-thumb.
To study the asphaltene precipitation, Shen and Sheng (2016) first
measured the asphaltene sizes under CH 4 and CO 2 injection. The dead
oil sample from a Wolfcamp shale reservoir was used. The viscosity was
3
3.66 cP and the density was 0.794 g/cm . The experimental setup is shown
in Fig. 3.1. It mainly consisted of a reservoir cylinder, a filter cylinder, and a

Figure 3.1 Schematic to measure asphaltene particle sizes.