甲烷辅助多侧向注入SAGD工艺作为非均质油藏超稠油开采新方法的实验研究

IF 6.7 1区工程技术 Q2 ENERGY & FUELS

Fuel Pub Date : 2025-06-11 DOI:10.1016/j.fuel.2025.135939

Xiaofei Sun , Xiyan Wang , Jiuning Zhou , Yongbin Zhao , Hongxin Li , Xiangyu Wang , Xinyu Sun , Guanglei Xie

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引用次数: 0

摘要

蒸汽辅助重力泄油（SAGD）是一种高效的开采特稠油的热采技术。然而，它仍然面临着高蒸汽使用量、高能量损失和不利环境影响的挑战。本研究开发了一种新的方法，称为甲烷辅助多分支注入SAGD工艺（MAM-SAGD），以改善非均质油藏SAGD工艺的性能。本研究首次通过大规模实验研究了MAM-SAGD工艺的生产性能，阐明了MAM-SAGD工艺提高采收率的潜在机理，分析了关键参数对MAM-SAGD工艺性能的影响。结果表明，由于多侧向注入和甲烷（CH4）共同作用，MAM-SAGD工艺是一种可行的非均质油藏超稠油开采方法。MAM-SAGD工艺的最高采收率为49.05%，是SAGD工艺的3倍以上。多侧注入器和CH4的贡献分别为70.8%和29.2%。泥岩屏障的不利影响程度排序如下：多分支注入器；MAM-SAGD。CH4应在MAM-SAGD工艺的后期与蒸汽共注入。适量的CH4和合理的主井与侧井垂直距离可以显著提高MAM-SAGD过程的性能。研究结果为设计非均质油藏超稠油开采新工艺的实际应用提供了有价值的实验数据。未来还需要进行更多的研究，包括设计MAM-SAGD过程的应用方案，以及通过油藏数值模拟来验证MAM-SAGD过程的性能。

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Experimental study of methane-assisted multi-lateral injector SAGD processes as a novel method for extra-heavy oil recovery in heterogeneous reservoirs

Steam-assisted gravity drainage (SAGD) is a highly efficient thermal recovery technique for producing extra-heavy oil. However, it is still faced with the challenges of high steam usage, high energy losses, and adverse environmental impact. A novel method, called methane-assisted multi-lateral injector SAGD process (MAM-SAGD) was developed in this study for improving the performance of SAGD processes in heterogeneous reservoirs. In this study, for the first time, the large-scale experiments were conducted to study the production performance of MAM-SAGD processes, to clarify the underlying enhanced oil recovery mechanisms of MAM-SAGD processes, and to analyze the impacts of key parameters on the performance of MAM-SAGD processes. The results indicated that the MAM-SAGD process is a feasible method for extra-heavy oil recovery in heterogeneous reservoirs due to the combined mechanisms of multi-lateral injector and methane (CH₄). The highest oil recovery factor of the MAM-SAGD processes was 49.05 %, which was more than 3 times that of the SAGD process. The contributions of multi-lateral injector and CH₄ were 70.8 % and 29.2 %, respectively. The adverse impact degree of the mudstone barrier was ranked as follows: SAGD > multi-lateral injector SAGD > MAM-SAGD. The CH₄ should be co-injected with steam at the late phase of a MAM-SAGD process. An intermediate amount of CH₄ and a reasonable vertical distance between the main and lateral wellbores could significantly enhance the performance of MAM-SAGD processes. The results provide valuable experimental data that can be used to design practical applications of this novel process for producing the extra-heavy oil in heterogeneous reservoirs. More researches including designing application schemes of the MAM-SAGD process and verifying the performance of MAM-SAGD process by reservoir numerical simulations will be required in the future.

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来源期刊

Fuel 工程技术-工程：化工

CiteScore

12.80

自引率

20.30%

发文量

3506

审稿时长

64 days

期刊介绍： The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.