SiO_2纳米颗粒在碳酸盐岩储层中强化采油实验研究

Experimental study on enhanced production of SiO_2 in carbonate reservoir

改变润湿性可以有效提高亲油性碳酸盐岩储层中原油采收率。然而纳米颗粒在这一领域的应用处于起步阶段。为此,本文研究了纳米流体的浓度对润湿性和界面张力的影响,从而确定注入岩心的纳米流体的最佳浓度。结果表明,浓度为4g·L^(-1)的纳米流体的浓度可以显著地改变岩心的润湿性,使之从强亲油状态到强亲水状态。此外,本文还研究了纳米流体在亲油岩心塞下增强采收率方面的潜力。结果表明,向充满纳米流体的老化岩心再次注入水,能采出大量的石油。

Changing the wettability can effectively improve the oil recovery in lipophilic carbonate reservoirs. However, the application of nanoparticles in this field is in its infancy.For this reason, the effect of nanofluid con- centration on wettability and interracial tension was studied in order to determine the optimum concentration of nanofluid injected into the core.The results show that the concentration of 4g·L-1 nanofluids can significantly change the core wettability, making it from strong lipophilic state to a strong hydrophilie state. In addition, the po- tential of nanofluids for enhancing oil recovery under lipophilic cores has also been investigated.The results show that reinjeetion of water into an aging core filled with nanofluids can produce large quantities of oil.