Interactions in bypassed oil-CO2 systems and their utilization in enhancing the recovery of bypassed oil
Interactions in bypassed oil-CO2 systems and their utilization in enhancing the recovery of bypassed oil
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DOI：
10.1016/j.fuel.2018.10.019
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发表时间：
2019-02
期刊：
影响因子：
7.4
通讯作者：
M. Ding;Yefei Wang;Yugui Han;Miao Gao;Renzhuo Wang
中科院分区：
文献类型：
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作者：
M. Ding;Yefei Wang;Yugui Han;Miao Gao;Renzhuo Wang
为了更好地理解旁路油与二氧化碳之间的相互作用，并研究它们对旁路油采收率的贡献，进行了一项实验研究。首先，开展了轻烃萃取与溶蚀溶胀相互作用实验。根据模拟的浅层/深层旁通油在旁通区域的分布，对其进行了研究。岩心驱油测试旨在确定旁路采油水平，重点是相互作用主导、浸泡和“吹气”（HnP）策略（传统的非旁路采油方法）。我们发现，在40 MPa的压力下，可以提取大量的浅层旁路油，最大萃取效率为85.2%，使其收缩而不是更常见的膨胀。深层旁通油的采出程度不如浅层旁通油，主要表现为溶蚀为主的膨胀方式。岩心驱油试验表明，在浸泡过程中发生的相互作用只能使少量的旁路油被回收（采收率约为20%，令人失望）。在这种情况下，可能主要是浅层旁路油被激活。此外，通过油成分分析还观察到浸泡过程中主要相互作用的转变。最后，幸运的是，HnP能够将旁路油的采收率提高到令人满意的90%左右，从而消除了大部分深层旁路油。
An experimental study was conducted to improve understanding of the interactions between bypassed oil and CO2, and to investigate their contribution to bypassed oil recovery. First, experiments were carried out that focus on the interaction in terms of light-hydrocarbon extraction and dissolution-induced oil swelling. These were studied with respect to the simulated shallow/deep bypassed oil, according to their distribution in the bypassed region. Core flooding tests were designed to determine the level of bypassed oil recovery, which focus on the interaction-dominated, soaking, and ‘huff and puff’ (HnP) strategies (traditional methods for recovering non-bypassed oil). We find that, significant amounts of shallow bypassed oil could be extracted with a maximum extraction efficiency of 85.2% at 40 MPa, making it shrink instead of the more commonly observed expansion. Such deep bypassed oil could not be extracted to the same significant extent as shallow bypassed oil, mainly behaving in a dissolution-dominated expansive manner. Core flooding tests show that interactions occurring during soaking only allow a small amount of bypassed oil to be recovered (yielding a somewhat disappointing recovery factor of approximately 20%). It is likely that mainly shallow bypassed oil is activated in this case. Additionally, the transition of the dominating interactions during soaking was also observed by oil composition analysis. Lastly, but fortunately, HnP is able to enhance bypassed oil recovery to a more satisfying level of around 90%, removing the majority of the deep bypassed oil therewith.