Investigating the Impact of Hydrocarbon Solvent on In-Situ Asphaltene Precipitation in Solvent-Assisted Cyclic Steam Technique

IF 4.3 3区材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

ACS Applied Electronic Materials Pub Date : 2024-03-01 DOI:10.2118/219493-pa

Hamed Rahnema, Aly ElMasry, M. Rahnema

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引用次数: 0

Abstract

Heavy oil recovery techniques often confront a significant challenge in in-situ asphaltene precipitation. This procedure significantly affects the characteristics of reservoirs and impedes optimal oil extraction. The purpose of this research was to examine how hydrocarbon solvents affect asphaltene precipitation occurring naturally in the reservoir as well as the resulting asphaltene content in processed oil. This was conducted using a laboratory-level dynamic model and the solvent-assisted cyclic steam stimulation (CSS) method. Throughout this experiment, which comprised six cycles, the steam-solvent blend’s pressure was consistently maintained close to 680 psi and the temperature was maintained at 500°F at the injection point. The findings revealed crude oil cracking at this temperature and noticeable in-situ asphaltene precipitation during the solvent-assisted CSS process. Notably, asphaltenes demonstrated mobility within porous media, contributing to their production in subsequent CSS cycles. Compared to a steam-only CSS control experiment, a higher asphaltene content in the original oil was observed, indicating that thermodynamic changes during the experiments likely caused asphaltene cracking. To sum up, this research provides an understanding of the effects of heavy oil recovery methods that rely on solvents on the precipitation of in-situ asphaltene and the content of asphaltene in the refined oil.

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研究溶剂辅助循环蒸汽技术中碳氢化合物溶剂对沥青质原位沉淀的影响

重油开采技术经常面临沥青质原位沉淀的巨大挑战。这一过程会严重影响储油层的特性，阻碍石油的最佳开采。这项研究的目的是考察碳氢化合物溶剂如何影响油藏中自然析出的沥青质以及加工石油中的沥青质含量。研究采用了实验室级动态模型和溶剂辅助循环蒸汽激励（CSS）方法。整个实验包括六个循环，蒸汽-溶剂混合的压力始终保持在 680 psi 附近，注入点的温度保持在 500°F。实验结果表明，在溶剂辅助 CSS 过程中，原油在此温度下发生裂解，并出现明显的原位沥青质沉淀。值得注意的是，沥青质在多孔介质中具有流动性，这有助于它们在随后的 CSS 循环中产生。与纯蒸汽 CSS 对照实验相比，原油中的沥青质含量更高，这表明实验过程中的热力学变化很可能导致了沥青质裂解。总之，这项研究有助于了解依赖溶剂的重油开采方法对原地沥青质析出和精炼油中沥青质含量的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

ACS Applied Electronic Materials Multiple-

CiteScore

7.20

自引率

4.30%

发文量

567

期刊介绍： ACS Applied Electronic Materials is an interdisciplinary journal publishing original research covering all aspects of electronic materials. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials science, engineering, optics, physics, and chemistry into important applications of electronic materials. Sample research topics that span the journal's scope are inorganic, organic, ionic and polymeric materials with properties that include conducting, semiconducting, superconducting, insulating, dielectric, magnetic, optoelectronic, piezoelectric, ferroelectric and thermoelectric. Indexed/Abstracted： Web of Science SCIE Scopus CAS INSPEC Portico