Expanding the electrical double layer of minerals through low-salinity brine injection has been suggested as a possible enhanced oil recovery mechanism. To investigate this theory, we measured the ζ potential of different minerals, namely, sands from Fontainebleau, Ottawa, and Landes, a sample from a sandstone outcrop, and one crude oil. ζ-potential measurements can be used to quantify the surface charges of materials; therefore, experiments associated with this technique were performed to predict the behavior of repulsion or attraction between materials in different salinity and pH conditions. We showed that there is no significant difference between the ζ potentials of the tested materials. We did, however, observe that the different sands and sandstone have dissimilar adhesion behaviors. No correlation was found between the electrokinetic measurements performed on the minerals and their response to crude oil introduced into the system. The adhesion results obtained for the Landes and Ottawa sands were perfectly in line with what was expected from ζ-potential measurements, but the Fontainebleau sand and sandstone exhibited different behaviors. For the tested minerals, we showed that ζ-potential changes may not be only responsible for a low-salinity brine effect concerning a system oil/brine/rock systematically characterized in a coreflood with an observed additional recovery.

中文翻译：

---

双层电气膨胀对高盐度和低盐度卤水的油-石英粘附力的影响

有人建议通过注入低盐度的盐水来扩大矿物质的双电层，这可能是提高采油率的一种机制。为了研究这一理论，我们测量了不同矿物的ζ势，即枫丹白露，渥太华和兰德斯的沙子，砂岩露头的样品和一种原油的ζ势。ζ电位测量可用于量化材料的表面电荷；因此，进行了与此技术相关的实验，以预测在不同盐度和pH条件下材料之间的排斥或吸引行为。我们表明，被测材料的ζ电位之间没有显着差异。但是，我们确实观察到，不同的沙子和砂岩的粘附行为不同。在矿物上进行的电动测量与它们对引入系统的原油的响应之间没有发现相关性。Landes和Ottawa砂的附着力结果与ζ电位测量结果完全一致，但枫丹白露砂和砂岩表现出不同的行为。对于测试的矿物，我们显示出ζ电位变化可能不仅是导致低盐度盐水影响的原因，后者涉及在岩心驱油中系统表征的系统油/盐水/岩石，并具有观察到的额外采收率。但是枫丹白露的沙子和砂岩表现出不同的行为。对于测试的矿物，我们显示出ζ电位变化可能不仅是导致低盐度盐水影响的原因，后者涉及在岩心驱油中系统表征的系统油/盐水/岩石，并具有观察到的额外采收率。但是枫丹白露的沙子和砂岩表现出不同的行为。对于测试的矿物，我们显示出ζ电位变化可能不仅是导致低盐度盐水影响的原因，后者涉及在岩心驱油中系统表征的系统油/盐水/岩石，并具有观察到的额外采收率。