Optimized polymer enhanced foam flooding for ordinary heavy oil reservoir after cross-linked polymer flooding.
Optimized polymer enhanced foam flooding for ordinary heavy oil reservoir after cross-linked polymer flooding.
复制标题
普通稠油油藏交联聚合物驱后优化聚合物增强泡沫驱
DOI：
10.1007/s13202-015-0226-2
复制
发表时间：
2016
影响因子：
2.2
通讯作者：
Xia Z
中科院分区：
文献类型：
--
作者：
Sun C;Hou J;Pan G;Xia Z
JD油藏是一个具有高渗透率的普通稠油油藏，在该油藏中成功地实施了交联聚合物驱。尽管如此，仍然有大量的连续石油留在原地，由于更强的纵向非均质性，这些石油不容易开采。针对JD油藏选择性堵塞的特点，采用聚合物增强泡沫（PEF）驱作为后续提高采收率技术。天然气作为发泡气体，成本低，来源丰富。在前期工作中，通过一系列的配伍性研究，推荐了CEA/FSA 1表面活性剂体系作为天然气泡沫驱的泡沫剂。泡沫性能评价实验表明，CEA/FSA 1与JD油藏产出油反应，起泡体积达110 mL，半衰期达40 min，无因次过滤系数达1.180。为了比较不同提高采收率技术的采收率，在包括相对高渗透率和相对低渗透率岩心的平行岩心系统中进行了一系列驱油实验。研究涉及的三次采油技术包括进一步交联聚合物驱、表面活性剂-聚合物驱和脉冲电场驱。结果表明，脉冲电场驱提高原油采收率最高，为19.2%，其次为S-P驱（9.6%）和C-P驱（6.1%）。采出液率结果表明，脉冲电场驱可以通过改变注入剖面，有效地提高低渗透岩心的采收率。
A successful cross-linked polymer flooding has been implemented in JD reservoir, an ordinary heavy oil reservoir with high permeability zones. For all that, there are still significant volumes of continuous oil remaining in place, which can not be easily extracted due to stronger vertical heterogeneity. Considering selective plugging feature, polymer enhanced foam (PEF) flooding was taken as following EOR technology for JD reservoir. For low cost and rich source, natural gas was used as foaming gas in our work. In the former work, the surfactant systems CEA/FSA1 was recommended as foam agent for natural gas foam flooding after series of compatibility studies. Foam performance evaluation experiments showed that foaming volume reached 110 mL, half-life time reached 40 min, and dimensionless filter coefficient reached 1.180 when CEA/FSA1 reacted with oil produced by JD reservoir. To compare the recovery efficiency by different EOR technologies, series of oil displacement experiments were carried out in a parallel core system which contained cores with relatively high and low permeability. EOR technologies concerned in our work include further cross-linked polymer (C-P) flooding, surfactant-polymer (S-P) flooding, and PEF flooding. Results showed that PEF flooding had the highest enhanced oil recovery of 19.2 % original oil in place (OOIP), followed by S-P flooding (9.6 % OOIP) and C-P flooding (6.1 % OOIP). Also, produced liquid percentage results indicated PEF flooding can efficiently promote the oil recovery in the lower permeability core by modifying the injection profile.