Technology Focus: Oilfield Chemistry (September 2025)

_ As the oil and gas industry positions itself amid the emerging variety of energy sources, the need for sustainable innovation, efficient resource planning, and a greater understanding of subsurface science through applied chemistry is greater than ever. Three papers were selected based on their forward-looking approaches to these challenges. They include a wide variety of subjects, including enhancing carbon sequestration, understanding scale mitigation, and improving direct lithium extraction (DLE) from produced water. Paper SPE 221397 highlights an innovative approach to leverage the science of nanotechnology to enhance DLE from high-salinity produced water. Produced water contains trace but recoverable concentrations of lithium. Although these concentrations are too low for solar evaporation (a technique used to recover lithium), it is ideal for DLE. With massive barrels of brine produced every day as a byproduct of oil and gas, even a small percentage of extractable lithium offers an added advantage. The researchers in the paper highlighted the development of novel nanoparticles from polyethyleneimine and dextran sulfate, which increased lithium entrapment efficiency to 48%. This improvement was achieved through bilayer nanoparticle deposition. The paper offers interdisciplinary novelty with the potential to create high-value outputs from the existing oil and gas infrastructure. The second paper, SPE 218743, offers a valuable insight into scale mitigation, which is a critical flow-assurance challenge. The study unveils a method to study the squeeze-treatment models using a combination of a small sandpack system coupled with a high-resolution X-ray computed tomography scan. This way, precipitation mechanisms can be studied in real time, enabling a better understanding of scale-inhibitor retention caused by pure adsorption, precipitation, and coupled mechanisms under varying conditions of pH, temperature, and ion concentration. The paper was selected because it tries to bridge the gap between laboratory-scale analysis and field application, offering a more-mechanistic understanding of scale squeeze-treatment performance. The third paper, SPE 220815, investigates carbon sequestration using mineral carbonation. The authors studied the reaction of CO2 with magnesium, calcium, olivine, dolomite, magnetite, and gypsum under varied heating rates, temperatures, and aqueous-phase conditions. With the combination of thermogravimetric analysis/differential scanning calorimetry with scanning electron microscopy/energy dispersive spectroscopy, they quantified carbon uptake at different test conditions and established strong correlations between heating rate, brine salinity, and mineral reactivity. The study presented that significant CO2 mineralization could occur within hours—even at atmospheric pressure—with dolomite and olivine showing the highest uptake when exposed to formation brine. With the world moving toward decarbonization, this paper provides an interesting look at low-risk CO2 sequestration using naturally abundant rock formations. Summarized Papers in This September 2025 Issue SPE 221397 - Nanoparticles Aid Extraction of Lithium From Oilfield Brines by David K. Danso, University of Kansas, et al. SPE 218743 - Decoupling Phosphonate Scale-Inhibitor Adsorption and Precipitation Mechanisms by Isaac A. Løge, Technical University of Denmark, et al. SPE 220815 - Study Explores Accelerated Carbon Capture and Storage Through Mineral Carbonation by Leila Karabayanova, Texas A&M University, et al.