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首页> 外文会议>SPE Heavy Oil Conference >Alteration of matrix wettability during alternate injection of hot-water/solvent into heavy-oil containing fractured reservoirs
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Alteration of matrix wettability during alternate injection of hot-water/solvent into heavy-oil containing fractured reservoirs

机译：将热水/溶剂的替代注入含重油储层的碎屑储存期间的基质润湿性的改变

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An alternate injection of solvent and hot water/steam called Steam-Over-Solvent injection in Facture Reservoirs (SOS-FR) has been recently suggested and tested by our research group. In this process, most oil is produced during the solvent phase and then hot water/steam phase is assigned, mainly to retrieve the solvent. Oil recovery during this phase is typically low due to limited thermal expansion in the case of oil-wet matrix, and because capillary imbibition and gravity drainage driven by viscosity reduction do not have a significant contribution to the recovery. Wettability alteration toward more water-wet state will, however, enhance these mechanisms. Based on these facts, different wettability alteration agents were tested including cationic and anionic surfactants, ionic liquids, nano-fluids, high pH solutions, and low salinity water. The potential of these materials to modify the wettability of aged sandstone and limestone samples was evaluated using imbibition tests. Berea sandstone (aged to be oil-wet) and Indiana limestone samples were saturated with heavy oil (3, 600 cp). After the wettability modification was confirmed using different tests, the SOS-FR method was applied. The process was initiated by soaking cores into solvent (heptane or diluent oil) and the oil recovery was estimated using refractive index measurements. Then, two different experimental schemes were followed. In this first scheme, different brines were used and the oil production readings were taken periodically. These experiments will yield additional oil recovery (and solvent retrieval) by capillary imbibition and enhance gravity drainage if the wettability alteration due to solvent effect in the previous phase and chemical injected in the subsequent phase was achieved. In the second scheme, the heptane was retrieved first by hot-water exposure and the capillary imbibition tests were performed to test the selected chemical additive solutions as the wettability alteration agents. After conducting a total of 28 experiments, the most promising wettability alteration agents were marked and optimal application conditions (i.e., temperatures, injection sequence) were identified.
机译：最近已经建议并测试了由经常储存器（SOS-FR）的溶剂和热水/蒸汽的溶剂和热水/蒸汽注入，并通过我们的研究组来测试。在该过程中，大多数油在溶剂相期间产生，然后分配热水/蒸汽相，主要是为了取回溶剂。由于油湿性基质的情况下，在该阶段期间的储存通常是低的，并且由于油湿基质的情况下，由于粘度减少的毛细管性吸收和重力引流对恢复没有显着贡献。然而，对更多水湿态的润湿性改变将增强这些机制。基于这些事实，测试不同的润湿性改变剂，包括阳离子和阴离子表面活性剂，离子液体，纳米流体，高pH溶液和低盐度水。通过吸收测试评估这些材料改变砂岩和石灰石样品润湿性的潜力。 Berea Sandstone（Aged to油湿）和印第安纳石灰石样品用重油（3,600cp）饱和。使用不同的试验确认润湿性修饰后，施加SOS-FR方法。通过将芯浸泡成溶剂（庚烷或稀释油）来引发该方法，并使用折射率测量估计油回收。然后，遵循两种不同的实验计划。在该第一种方案中，使用不同的盐水，并定期进行油生产读数。这些实验将通过毛细管性吸收产生额外的采油（和溶剂检索），并且如果在先前相和在随后的相中注入的化学物质引起的溶剂效果，则增强重力排放。在第二种方案中，首先通过热水暴露检出庚烷，并进行毛细管性吸收试验以测试所选择的化学添加剂溶液作为润湿性改变剂。在总共进行28个实验后，鉴定了最有前景的润湿性改变剂（即，温度，注射序列）标记和最佳的施用条件。

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