Analysis of Reservoir Applicability of Hydrophobically Associating Polymer

Abstract

In this paper, the reservoir characteristics and fluid properties of a reservoir of the Bohai Sea oil field were taken as the research platform. It was confirmed that there exists compatibility between hydrophobically-associating-polymer (HAP) molecular aggregation and pore-throat size. The experiment for oil displacement in heterogeneous cores indicated that there exists applicability of HAP for a heterogeneous reservoir and the applicability can be influenced by polymer concentration. The experiment for oil displacement of parallel cores demonstrated the effect of polymer concentration on the applicability of HAP for reservoir heterogeneity from two aspects of the dynamic behavior of oil displacement and the effectiveness of oil displacement. The results show that with the increase of HAP concentration, the association degree between polymer molecules increases, molecular-clew dimension enlarges, and the compatible size of pore throats of the core increases. The change of HAP concentration not only has an effect on the amount of liquid suctioned by different permeability layers and on the time of profile inversion, but also has an effect on the displacement ability of polymer solution within different layers. As polymer concentration changes, the adaptability of HAP for reservoir heterogeneity changes and the oil-recovery efficiency also changes.

Understanding the flow behaviour of copolymer and associative polymers in porous media using extensional viscosity characterization: Effect of hydrophobic association

“…Besio et al reported that the polymers in extended (stretched) form are likely to get adsorbed more than when being in the quiescent coiled state due to a larger size. Further, for the same permeability, RF and residual resistance factor (RRF) increase for AP with the increase in the concentration . The authors attributed the increase in RF and RRF to the increased apparent viscosity caused by the intense association.…”

“…Therefore, the RF of AP and HPAM in the porous media needs a comparative investigation, considering CAC in shear and extensional flow, and thereby, the effect of hydrophobic association onset. Similarly, the stronger the hydrophobic associations, the higher the RRF will be . Thus, considering the nature of hydrophobic association, the extensional role on permeability reduction by AP also requires a comparative investigation with HPAM.…”

A Study on the Optimization of Surfactants in the Main and Vice Slug in Weak Base ASP Flooding

“…The pressure change value, liquid producing capacity, water rate, and oil rate in each period were recorded, and then the recovery factor was calculated. The experimental process diagram is shown in Figure 8 [14].…”

Hydrophobic‐associated polymer‐based laponite nanolayered silicate composite as filtrate reducer for water‐based drilling fluid at high temperature

“…However, most of HAPs were applied to improve oil recovery in the petroleum industry . Due to a small amount of hydrophobic groups was grafted at hydrophilic polymer chains, the HAPs possess good solubility and thickening effect . The large hydrophobic groups in the side chain of polymer increased hydrodynamic volume of polymer, leading to the viscosity of solution increased .…”