Effect of temperature on the pH of water flood effluents and irreducible water saturation: A study with reference to the Barail sandstone outcrop of the upper Assam Basin

Abstract Low salinity water flooding (LSWF) is a promising strategy for improving oil recovery in sandstone reservoirs, and recent studies have shown that the with low injection function of not only ionic composition but also pH injected brine, temperature, combined effect both on wetting properties clay mineral surfaces. Following brine flooding, initial wettability rock surfaces existed when crude oil, formation (FW), surface interaction were chemical equilibrium at reservoir condition changes based pH, salinity, mineralogy. This study proposes core flood irreducible saturation as key parameters inducing porous media. In present work, cores subjected to temperatures 70 °C, 85 105 °C measured discharge effluents or respect varying temperatures. paper investigates rise gradient saturation, S wir LS increasing using Barail core. The results include following: increases which indicates shifting existing state rock. effects pertaining progressively result Increasing cause an increase , follows linear relationship. findings highlight link hence fluid flow oil–water relative permeability behaviour. increased are connected wetness elevated As adequate work consensus potential temperature alteration under still lacking, current relation upper Assam basin could be novel reference understanding importance dependent behaviour cores. this can assist approach towards considering effluent alternatively