Name: LETÍCIA SILVEIRA DIAS DE ASSUNÇÃO
Publication date: 23/12/2022
Advisor:
Name |
Role |
|---|---|
| OLDRICH JOEL ROMERO | Advisor * |
Examining board:
| Name |
Role |
|---|---|
| ANA PAULA MENEGUELO | Internal Examiner * |
| OLDRICH JOEL ROMERO | Advisor * |
Summary: The injection of oil-water emulsions (O/W) is an oil recovery method, which
remained in control of the mobility of the injected fluid, has the potential to increase
the volume of oil recovered. For the mechanism to work properly, in addition to
knowing the characteristics of the reservoir, it is extremely important to understand
the physical properties of the emulsion. For this purpose, in this research eight
synthetic emulsions were prepared, composed of 10% of oil phase (paraffinic
mineral oil ALOGRO M600) and 90% of aqueous phase. They were under the
influence of the concentration variation of the mixture of two non-ionic surfactants
(Span 80® and Tween 80®). The prepared experiments were characteristic through
their kinetic stability, appearance and droplet size experience (DTG). The emulsion
selected for injection into the porous medium was synthesized with 0.4%
concentration of the surfactant mixture, emulsified at a rotation of 10.000 rpm for 5
min. The results proved that this emulsion was kinetically stable and presented an
average value of droplet size in the range of 2 µm. The emulsion showed a
pseudoplastic behavior, with an average apparent frequency of 98.47 mPa·s.
Initially, the emulsion proved to be immiscible with PETRONAS lubricating oil and
given its stability, the dispersion was selected for the oil recovery experiment. The
effect of emulsion injection in a porous medium was thought through the behavior
of the injection pressure for the rotation of water injection and emulsion injection.
Three experiments were carried out on two samples of sandstone and one
carbonate rock, with different permeabilities. The results of the recovery
experiments show that the water injection results in a recovery factor of 41.56% and
the emulsion injection led to an increase in the injection pressure of 0.323 kgf/cm²
in the rock sample with the highest permeability, which which confirms that the
emulsion injection behavior favors oil recovery
