Numerical studies on the effects of various complicated barrier configurations on sweep efficiency in surfactant/polymer flooding

Interaction of Dendrimer-Based Polymer with Sodium Dodecyl Benzenesulfonate: Characterization and Effect on Properties of Composites

“…Serving as the displacing system, the SP composite should be provided with great rheological performance. , In this case, it is able to have a pulling effect on the small oil blocks in the dead angles of the formation . In order to investigate the effect of the interaction between HPMA and SDBS on the rheological behavior of the HPMA/SDBS system, the apparent viscosity and viscoelasticity of SP compounds with various SDBS concentrations were studied at 25 °C.…”

“…On the contrary, surfactant flooding is able to lower the interfacial tension between oil and water and improve displacement efficiency effectively. ,, However, problems for surfactant flooding include low sweep efficiency, high cost, and excessive adsorption on the rock. − On the basis of the merits and shortages of polymer flooding and surfactant flooding, polymer/surfactant (SP) combinational flooding has been widely used in tertiary recovery. The technique promises both viscoelasticity and lower interfacial tension and can reduce the dosage of the surfactant. − Moreover, SP flooding overcomes the drawbacks of conventional alkali/polymer/surfactant (ASP) combination flooding technology, which involves reaction with divalent ions causing blockage of pipes, damage to equipment and impairment of the reservoir formation due to the addition of alkali. , …”

“…At present, the polymers widely used for the SP system are partially hydrolyzed polyacrylamide and its modified products, which are highly sensitive to shear and thermal degradation. , In a salt solution, cationic ions shield the negative charges carried by carboxyl groups and produce all macromolecules with flexible chain shrinking, resulting in a dramatic decrease in viscosity. , Therefore, with the enhanced oil recovery (EOR) strategy moving toward much harsher reservoirs, the screening of components for the SP composite system remains a considerable challenge.…”

Krafft Point Prediction of Anionic Surfactants Using Group Contribution Method: First‐Order and Higher‐Order Groups

“…The applications of these surfactants are different. For example, anionic surfactants or a mixture of anionic‐nonionic surfactants are used in enhanced oil recovery (EOR) to reduce the interfacial tension (IFT) between water and oil (Le Van and Chon, ; Nourafkan et al, ). Anionic surfactants can lower the IFT more than amphoteric surfactants (Kamal et al, ).…”