But the introduced mobility ratio
eliminated the error.
In order to reduce oil-water mobility ratio
effectively and enhance oil recovery, polymer solution in the formation needs high viscosity.
In their test, the breakthrough recovery decreased as the capillary number increased with the exception of lowest injection rate (1 mL/min), and the major difference between conventional oil and heavy oil waterflooding was attributed to different water breakthrough timing, and that residual heavy oil was bypassed due to adverse mobility ratio, not capillary trapping.
Misuse of CDC in EOR included the ignorance of mobility ratio, Darcy linear flow hypothesis, difference between microscopic capillary number and the microscopic one, and remaining oil and residual oil.
(3) When HPAM is flooded at high concentration, more recovery will be obtained because of boosting the viscofying property of solution and as a result the mobility ratio
becomes more favorable as close to the unity.
The results reveal that the higher the gas-to-oil mobility ratio
, the greater the finger height.
3) Comparison among the strategic groups of both periods and calculation of the mobility ratio.
(15) Example of it is the mobility ratio stated by Sudharshan, Thomas & Fiegenbaum (1991) and used at the Spanish context by Mas (1996).
As for mobility control, the key is the type, concentration, and amount of polymer used to attain proper viscosity ratio or mobility ratio to prevent fingering or channeling.
Polymer, as an important part of the ASP flooding, is mainly used to increase the viscosity of the injection system and thus improve the mobility ratio. Although there were reports on polymer viscoelastic flooding, the main parameter of the polymer solution in EOR is its viscosity.
This instability that increases with increasing mobility ratio defined as the ratio of the mobility of the displacing fluid to that of the displaced one is commonly known as the Saffman-Taylor instability or simply the viscous fingering instability (Saffman and Taylor, 1958 and Chouke et al., 1959).
In addition the mobility ratio is characterized by R=ln([[mu].sub.2]/[[mu.sub.1]), where [[mu].sub.1] and [[mu].sub.2] are the viscosities of the displacing and the displaced fluid, respectively.