The role of fines transport in low salinity waterflooding and hybrid recovery processes

Wettability alteration of oil‐wet carbonate rocks by chitosan derivatives for application in enhanced oil recovery

“…TMC increased production by about 25% while TMC‐C14 produced a displacement of about 16% higher. These results showed that chitosan derivatives have the potential to become suitable additives for EOR and their performance was much better than the ones from commercial surfactants as CTAB, or from nanoparticles, 6,62 mainly due to their ability to better modify the wettability, turning the porous medium more water‐wet and then better facilitating the oil displacement 63,64 . The higher efficiency of TMC compared to the one of TMC‐C14 may be related to the fact that besides presenting a higher interaction with asphaltenes, due to its higher number of cationic sites and also higher accessibility to those active sites for electrostatic interactions, this derivative (TMC) also promoted a more efficient contact angle reduction.…”

“…These results showed that chitosan derivatives have the potential to become suitable additives for EOR and their performance was much better than the ones from commercial surfactants as CTAB, or from nanoparticles, 6,62 mainly due to their ability to better modify the wettability, turning the porous medium more water-wet and then better facilitating the oil displacement. 63,64 The higher efficiency of TMC compared to the one of TMC-C14 may be related to the fact that besides presenting a higher interaction with asphaltenes, due to its higher number of cationic sites and also higher accessibility to those active sites for electrostatic interactions, this derivative (TMC) also promoted a more efficient contact angle reduction. On the other hand, the high affinity for asphaltene shown by TMC-C14, as confirmed by AFM results, could favor the adsorption of this derivative inside the porous medium due to hydrophobic interactions with the oil, thus making it more challenging to be used.…”

Fines migration and permeability decline during reservoir depletion coupled with clay swelling due to low-salinity water injection: An analytical study

“…fines-induced formation damage). 19,82 More severe permeability decline would occur at the deepest layer of reservoir while the shallower layer would have less fines migration, thus reservoir fluid prefers to flow effectively in the shallower layer. This phenomenon could then construct a kind of "fines-assist slug" driving or controlling a fluid flow convection, which is undesirable because the average reservoir permeability is decreased.…”

Modelling of carbonate rock wettability based on surface charge and calcite dissolution

“…Some of the proposed models are based on the salinity of the brine [50], dissolution of the reservoir rock [9,10,35,51,52], and the concentration of adsorbed specific ion on the rock surface [41,53,54]. Others have used the amount of rock and oil surface species [8,55,56], concentration of adsorbed carboxylic oil component [6,57,58], ionic strength [59], concentration of aqueous ion [60], and migrated fines [61]. Some works have also applied the Deryaguin-Landau-Verwey-Overbeek theory (DLVO theory) to study the wettability alteration mechanism [62][63][64][65].…”