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首页> 外文期刊>Oil & gas science and technology >Effects of Solvent Properties and Injection Strategies on Solvent-Enhanced Steam Flooding for Thin Heavy Oil Reservoirs with Semi-Analytical Approach
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Effects of Solvent Properties and Injection Strategies on Solvent-Enhanced Steam Flooding for Thin Heavy Oil Reservoirs with Semi-Analytical Approach

机译：溶剂性质和注入策略对稀稠油油藏溶剂增强蒸汽驱的半解析法影响

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摘要

Compared with conventional steam flooding and Steam-Assisted Gravity Drainage (SAGD), Solvent-Enhanced Steam Flooding (SESF) is considered a more effective method for improving heavy oil recovery in thin reservoirs in terms of higher thermal efficiency and oil production rate. However, there remains a deficiency of accurate and efficient methods to evaluate and design an SESF project in the field. A semi-analytical model is proposed in this paper to predict the recovery performance of SESF and investigate the effects of solvent properties and injection strategies on the SESF process for thin heavy oil reservoirs. The proposed model provides a simple method to simulate not only single solvent injection but also multi-solvent injection by cooperating different values of solvent operating thickness and solvent solubility. To validate the model’s accuracy, comparisons are made between the proposed model results and the numerical simulation results for a specific heavy oil reservoir case. The results indicate that SESF can achieve a considerably higher oil production rate at the early recovery stage than steam flooding. Moreover, the paper also demonstrates that a higher injection rate results in a lower thermal efficiency increment when well spacing is constant. Nevertheless, a high injection rate may also be suitable for longer well spacing owing to the improvement of the viscosity profile beyond the edge of the steam zone caused by longer contact time between the solvent and crude oil.
机译：与常规蒸汽驱和蒸汽辅助重力驱油（SAGD）相比，溶剂增强蒸汽驱（SESF）被认为是提高稀薄油藏稠油采收率的一种更有效的方法，因为它具有更高的热效率和产油率。但是，仍然缺乏在现场评估和设计SESF项目的准确有效的方法。本文提出了一个半分析模型，以预测SESF的采收性能，并研究溶剂性质和注入策略对稀稠油油藏SESF过程的影响。所提出的模型提供了一种简单的方法，通过配合不同的溶剂操作厚度和溶剂溶解度值，不仅可以模拟单溶剂注入，而且可以模拟多溶剂注入。为了验证模型的准确性，将建议的模型结果与特定稠油储层案例的数值模拟结果进行比较。结果表明，SESF在早期采油阶段可以比蒸汽驱获得更高的产油率。此外，本文还表明，当井距不变时，较高的注入速率会导致较低的热效率增量。然而，由于溶剂和原油之间的较长接触时间导致的蒸汽区域边缘以外的粘度分布得到改善，因此高注入速率也可能适合于较长的井距。

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