Alkafeef Saad F, Al-Marri Salem S
Department of Petroleum Engineering, College of Technological Studies, P. O. Box 42325, Shuwaikh 70654, Kuwait.
ACS Omega. 2023 Jul 12;8(29):26619-26627. doi: 10.1021/acsomega.3c03692. eCollection 2023 Jul 25.
Resin molecules play a crucial role in the stability of colloidal asphaltene particles in petroleum reservoirs. De-stabilization of the asphaltene/resin interaction due to changes in thermodynamic parameters can cause asphaltene precipitation, thus leading to petroleum field problems such as decreased in situ permeability, as well as severe plugging problems in production facilities. One remedial technology used in the oil industry involves developing synthetic resins with enhanced chemical potential to increase the stability of asphaltene in the oil phase. However, accurately predicting what synthetic resin structures are compatible with asphaltenes in this context can be difficult and ineffective. Here, we introduce a method that enhances the stability of colloidal asphaltene in petroleum fluid by increasing the concentrations of natural-state oil resins and increases reservoir oil recovery by increasing the oil's aromatic power solvency. The stability of colloidal asphaltene and improvements in oil reservoir recovery were investigated by using an oil prefractionation process and a solvent deasphalting technology based on the residuum oil supercritical extraction process to develop three types of deasphalted oils derived from Kuwait Marrat oil. Using these methods, we found that resin concentration by volume in Marrat oil increased with the removal of more oil fractions. Asphaltene stability in the oil phase was strongly influenced by resin concentration. The deasphalted oils' aromatic power solvency increased the oil reservoir permeability by twofold. No formation damage was observed for all DAO products in core flooding tests.
树脂分子在石油储层中胶态沥青质颗粒的稳定性方面起着至关重要的作用。由于热力学参数的变化，沥青质与树脂相互作用的失稳会导致沥青质沉淀，进而引发诸如原地渗透率降低等石油领域问题，以及生产设施中的严重堵塞问题。石油工业中使用的一种补救技术涉及开发具有增强化学势的合成树脂，以提高沥青质在油相中的稳定性。然而，在此背景下准确预测哪些合成树脂结构与沥青质相容可能既困难又无效。在此，我们介绍一种方法，通过提高天然状态油树脂的浓度来增强石油流体中胶态沥青质的稳定性，并通过提高油的芳烃溶剂化能力来提高油藏采收率。通过采用原油预分馏工艺和基于渣油超临界萃取工艺的溶剂脱沥青技术，对科威特马拉特油进行处理，开发出三种脱沥青油，以此研究胶态沥青质的稳定性和油藏采收率的提高情况。使用这些方法，我们发现马拉特油中树脂的体积浓度随着更多油馏分的去除而增加。油相中沥青质的稳定性受树脂浓度的强烈影响。脱沥青油的芳烃溶剂化能力使油藏渗透率提高了两倍。在岩心驱替试验中，所有脱沥青油产品均未观察到地层损害。
