Brine

About: Brine is a research topic. Over the lifetime, 6542 publications have been published within this topic receiving 76741 citations.

Interfacial Tensions of the Crude Oil + Reservoir Brine + CO2 Systems at Pressures up to 31 MPa and Temperatures of 27 °C and 58 °C

Abstract: An experimental technique is developed to measure the interfacial tensions of the crude oil + reservoir brine + CO2 systems at pressures from (0.1 to 31.4) MPa and two temperatures (27 and 58) °C using the axisymmetric drop shape analysis (ADSA) technique for the pendant drop case. The measured dynamic interfacial tension is gradually reduced to an equilibrium value. For both the reservoir brine + CO2 system and the crude oil + CO2 system, the equilibrium interfacial tension decreases as the pressure increases, whereas it increases as the temperature increases. For the reservoir brine + CO2 system, the interfacial tension data are not available at P ≥ 12.238 MPa and 58 °C because the pendant brine drop cannot be formed in the CO2 phase. However, for the crude oil + CO2 system, the equilibrium interfacial tension remains almost constant at P ≥ 8.879 MPa and 27 °C or at P ≥ 13.362 MPa and 58 °C. Under the same conditions, nevertheless, the equilibrium interfacial tension of the crude oil + reservoir brine +...

NMR Investigation of the Quasi-Brine Layer in Ice/Brine Mixtures

Abstract: We report the study of a liquidlike phase that is found in dilute NaCl aqueous solutions frozen at temperatures below the liquid-to-solid-phase transition temperatures of H2O and NaCl·2H2O. There is strong evidence that heterogeneous reactions of gases with halides in liquid layers on ice are the source of halogen radicals that destroy the lower tropospheric ozone, and a subeutectic brine phase is thus of particular relevance to discussions of atmospheric composition and its dependence on the chemistry of polar marine ice and snow. The fractions and concentrations of water and NaCl in this subeutectic quasi-liquid phase were measured by 1H and 23Na NMR spectroscopy, and the experimental results compared to predictions derived from an equilibrium thermodynamic analysis. The temperature dependence of the salt concentration is well-described by the equilibrium theory for temperature ranges where ideal solution behavior holds; for lower temperatures, where the observed salt concentration increases and deviati...

Batteries for lithium recovery from brines

Abstract: Here, we report a new battery capable of efficiently recovering lithium from brines that is composed of a lithium-capturing cationic electrode (LiFePO4) and a chloride-capturing anionic electrode (Ag). It can convert a sodium-rich brine (Li : Na = 1 : 100) into a lithium-rich solution (Li : Na = 5 : 1) by consuming 144 W h per kg of lithium recovered.

Hydrolysis and Precipitation of Polyacrylamides in Hard Brines at Elevated Temperatures

Abstract: Laboratory data are used to show that commercial polyacrylamides hydrolyze to an equilibrium degree that depends on the temperature of hydrolysis but is largely independent of the brine composition. At greater than 20 ppm hardness levels, polyacrylamide solutions pass through a sharp cloud point as their temperature is raised. This cloud-point temperature depends primarily on the hardness level of the brine and the degree of hydrolysis of the polymer, with lesser dependency on polymer molecular weight and polymer concentration. Indications are that these cloudy solutions cause plugging of porous media. Therefore, a polymer solution is potentially useful only below its cloud-point temperature. For application in a given reservoir, the temperature and frequently the hardness of the water are fixed. If a polyacrylamide hydrolyzes at reservoir conditions to where its cloud point in the field water falls below the reservoir temperature, it is not suitable for polymer flooding in that reservoir.