Oil recovery in fractured oil reservoirs by low IFT imbibition process
Oil recovery in fractured oil reservoirs by low IFT imbibition process
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DOI：
10.2118/36688-ms
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
Shabir Al-Lawati;S. Saleh
中科院分区：
文献类型：
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作者：
Shabir Al-Lawati;S. Saleh
本文介绍了一个实验研究的结果进行调查的影响，降低界面张力（IFT）的石油采收率的自发自吸和重力分离。静态渗吸实验的结果表明，基质块被渗吸流体包围，需要最小的邦德数（NB{sup-1}）来增加最终的油采收率。然而，IFT的减小可基本上取决于毛细管力和重力的相对贡献而增大或减小吸入速率。三个范围内的渗透率与四种不同的表面活性剂溶液（不同的IFT值）进行的实验结果表明，吸胀可以发生在三个不同的制度：毛细管为主，重力为主，和一个政权，其中两种力量影响吸胀过程。为了检查IFT对同一岩心上的石油采收率的影响，在每次测试之后必须恢复岩心润湿性。研究了几种清洁程序，以重现原始岩心润湿性。作为这项研究的成果，提出了一种恢复岩心润湿性的岩心清洁技术。在9500 F温度下用甲苯清洗岩心7小时后进行烧制，发现这是一种有效的程序，可在溶剂萃取后恢复岩心润湿性。表面活性剂溶液自吸试验后，同样的程序也被证明对恢复原始岩心润湿性有效。«少
This paper presents the results of an experimental study performed to investigate the effect of reduced interfacial tension (IFT) on oil recovery by spontaneous imbibition and gravity segregation. The results of the static imbibition experiments, in which a matrix block was surrounded by the imbibing fluid, showed that a minimum Bond number (NB{sup -1}) was required to increase the final oil recovery. However, the reduction of the IFT may increase or decrease the rate of imbibition substantially depending on the relative contribution of capillary and gravity forces. The results of the experiments performed on three ranges of permeabilities with four different surfactant solutions (different IFT values) showed that imbibition can occur in three different regimes: capillary dominated, gravity dominated, and a regime in which both forces affect the imbibition process. In order to examine the effect of IFT on oil recovery on the same core, core wettability has to be restored after each test. Several cleaning procedures were investigated to reproduce original core wettability. As an outgrowth of this research, a core cleaning technique for restoring core wettability has been suggested. Firing the core after toluene cleaning for seven hours at 9500 F was found to be an effective proceduremore » to restore core wettability after solvent extraction. The same procedure also proved effective for restoring the original core wettability after surfactant solution imbibition tests.« less