Experimental and theoretical investigation of cationic-based fluorescent-tagged polyacrylate copolymers for improving oil recovery
本研究聚焦于基于聚丙烯酰胺的荧光聚丙烯酸酯共聚物微球的应用，这是一种在石油行业中广泛使用的驱油剂。通过共聚反应合成了包含阳离子丙烯酰胺单体的荧光聚合物Poly 400、Poly 200和Poly 600，以创建具有增强稳定性和功能性的两亲聚合物。通过在透明石英玻璃制成的五点模型中进行注水测试，使用紫外线光即时测量和观察荧光强度，从而评估这些荧光聚合物的性能。在油藏条件下，驱油实验证实，Poly 400、Poly 200和Poly 600在水驱后分别增加了13.1%、9.1%和6.1%的原始石油油量（OOIP）。
研究结果表明，荧光聚合物微球能够有效地针对高渗透层，适应不同的孔喉尺寸，并提高高渗透通道的封堵率，从而优化石油采收率。随后使用CMG模拟器进行的模拟研究进一步揭示了这些荧光聚合物作为EOR剂的有效性，表明它们有潜力提高驱替效率和提高采收率。模拟结果显示，油饱和度从初始的68%分别降低到13.5%、16.1%和18.3%。本研究突出了荧光聚合物微球作为EOR应用中有价值的工具的潜力，为油藏管理和石油采收率优化提供了重大支持。
CMG软件应用情况
CMG模拟器用于验证聚合物注水实验在岩心和矿场尺度上的效果。通过使用CMG STARS模拟器进行的模拟研究，提供了对荧光标记聚合物作为潜在提高采收率（EOR）化学剂性能的深入认识。模拟结果表明，Poly 400、Poly 200和Poly 600的采收率分别为79.09%、75.02%和71.66%，与实验结果相符。此外，模拟还帮助评估了聚合物与油藏岩石和流体在不同条件下的相互作用，对于规划和优化EOR策略至关重要。
Abstract
The growing need for energy and the depletion of oil wells necessitate advanced Enhanced Oil Recovery (EOR) techniques, particularly water and polymer flooding, which play a crucial role in augmenting hydrocarbon recovery rates. However, water flooding in high-permeability layers often leads to water breakthroughs, reduced sweep efficiency, and the formation of preferential channels, posing significant challenges to oil recovery and reservoir management. Conformance control treatments, including the use of polymer microspheres, offer a promising solution by sealing high-permeability zones and enhancing sweep efficiency. This study focuses on the application of fluorescent polymer microspheres based on polyacrylamide, which is extensively employed in the oil sector as an oil displacement agent. Fluorescent polymers called Poly 400, Poly 200, and Poly 600, incorporating cationic methacrylamide monomers, were synthesized through copolymerization to create amphiphilic polymers with enhanced stability and functionality. These fluorescent polymers were evaluated through flooding tests using a quarter-five-spot model of transparent quartz glass under UV light, allowing for instantaneous measurement and observation of fluorescence intensity. At reservoir conditions, the oil displacement experiments confirm that the incremental oil after water flooding by Poly 400, Poly 200, and Poly 600, is 13.1%, 9.1%, and 6.1% of OOIP respectively. The findings showed that fluorescent polymer microspheres could efficiently target high-permeability layers, adapt to varying pore throat sizes, and improve the plugging rate of high-permeability channels, thereby optimizing oil recovery. A subsequent simulation study using the CMG simulator provided further insights into the efficacy of these fluorescent polymers as EOR agents, revealing their potential to enhance sweep efficiency and enhance oil recovery. Simulation results showed that oil saturation decreased from 68% (initial) to 13.5%, 16.1%, and 18.3% after Poly 400, Poly 200, and Poly 600 flooding respectively. This work highlights the potential of fluorescent polymer microspheres as a valuable tool for EOR applications, offering significant advancements in reservoir management and oil recovery optimization.
作者单位
埃及石油研究所石油化工部
