首页|活性MoS2纳米片剥离油膜机理研究

活性MoS2纳米片剥离油膜机理研究

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纳米材料可以提高原油采收率,但目前对于纳米材料的研究主要集中在球形纳米材料的性能上,对于二维片状纳米材料的研究甚少.自主合成了两亲性MoS2片状纳米材料(活性MoS2纳米片)用于大幅度提高水驱后原油采收率,针对活性MoS2纳米片在固体表面上的铺展规律进行系列研究,阐明了活性MoS2纳米片对固体表面油膜的作用机理.基于气-水-固相接触角的测量,明确了油湿性石英片在活性MoS2纳米片驱油体系中浸泡120 h后,水滴平衡接触角保持90°不变,石英片表面由油湿转变成中性润湿;地层水和质量分数为0.15%的SiO2纳米流体均无法使油膜在固体表面产生楔形膜,而质量分数为0.005%的活性MoS2纳米片驱油体系可在油-水-固接触区域形成明显的楔形膜,产生结构分离压力,最终剥离固体表面油膜.研究发现,在质量分数为0.005%的活性MoS2纳米片驱油体系中,油膜在固体表面的收缩过程中会形成内、外两条接触线,内、外接触线的收缩速度分别是0.661 7×10-5和8.581 7×10-5 cm/s;从热力学角度计算出油膜在收缩过程中油-水-固混合体系Gibbs自由能的增量呈负增长,证明油膜在活性MoS2纳米片驱油体系中的收缩是自发进行的.该项研究成果说明质量分数为0.005%的活性MoS2纳米片驱油体系具有高效的驱油能力.
Mechanism of oil film stripping by active MoS2 nanosheets
Nanomaterials for enhanced oil recovery(EOR)have gained more and more attention from petroleum researchers.How-ever,the research mainly focuses on the properties of spherical nanomaterials,and the research on two-dimensional nanosheets is insufficient.In this paper,the amphiphilic MoS2 nanosheets(active MoS2 nanosheets)were independently synthesized to signifi-cantly enhance the oil recovery after water flooding in reservoirs.The spreading law of active MoS2 nanosheets on a solid surface was studied,and the mechanism of active MoS2 nanosheets on an oil film of a solid surface was elucidated.Based on the measure-ment of the gas-water-solid three-phase contact angle,it is determined that the equilibrium contact angles of water droplets remain unchanged at 90° after oil-wet quartz is immersed in an oil displacement system of active MoS2 nanosheets for 120 h.Eventually,the wettability of the quartz surface changes from oil-wet to neutral-wet.Both formation water and SiO2 nanofluid(mass fraction of 0.15%)fail to make the oil film produce wedge film on the solid surface.However,the oil displacement system of active MoS2 nanosheets(mass fraction of 0.005%)could form a prominent wedge film in the oil-water-solid three-phase contact area,then form structural disjoining pressure and eventually strip the oil film from the solid surface.Moreover,it is found that the oil film could form two contact lines(inner line and outer line)during the contraction process on the solid surface in the oil displacement system of active MoS2 nanosheets(mass fraction of 0.005%).The contraction velocities of the inner contact line and the outer contact line are 0.661 7×10-5 and 8.581 7×10-5 cm/s,respectively.From the perspective of thermodynamics,the Gibbs free energy increment of the oil-water-solid mixture system is negative in the contraction process of oil film,which proves that the contraction of the oil film in the oil displacement system of MoS2 nanosheets is spontaneous.The research results show that the oil displacement system of MoS2 nanosheets(mass fraction of 0.005%)has high oil displacement efficiency.

active MoS2 nanosheetsstructural disjoining pressurewettabilityGibbs free energyoil displacement efficiency

梁拓、王绘鹏、何琛、杨昌华、屈鸣、侯吉瑞、杨二龙、柏明星

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西安石油大学 石油工程学院,陕西 西安 710065

中国石油长庆油田分公司 第十一采油厂,甘肃 庆阳 745002

东北石油大学 三亚海洋油气研究院,海南 三亚 572025

中国石油大学(北京)非常规油气科学技术研究院,北京 102249

东北石油大学 石油工程学院,黑龙江 大庆 163318

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活性MoS2纳米片 结构分离压力 润湿性 Gibbs自由能 驱油效率

中国博士后科学基金陕西省博士后科研项目国家自然科学基金西安石油大学研究生创新与实践能力培养项目中央支持地方高效改革发展资金人才培养项目

2023MD7442572023BSHTBZZ4552174046YCS23113041

2024

10.13673/j.pgre.202307023

油气地质与采收率
中国石油化工股份有限公司胜利油田分公司

油气地质与采收率

CSTPCD北大核心
影响因子：2.177
ISSN：1009-9603
年,卷(期)：2024.31(2)
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