赵宇,张剑,蒋庞露,邓森,贺亮,宫连杰,梁立豪
ZHAO Yu,ZHANG Jian,JIANG Panglu,DENG Sen,HE Liang,GONG Lianjie,LIANG Lihao

• 1:中国石油大庆油田有限责任公司勘探开发研究院
• 2:多资源协同陆相页岩油绿色开采全国重点实验室
• 3:中国石油技术开发有限公司
• 4:中国石油大学(北京)石油工程学院

摘要(Abstract)：

纳米流体常被用于提高非常规油藏采收率，为明确其在页岩表面吸附规律与机理，利用Lambert-Beer定律，通过吸光度与吸附量的关系对纳米流体在页岩表面的吸附规律进行研究。将纳米流体与页岩粉末混合、振荡并控制温度以达到吸附平衡，测量溶液浓度的变化以计算吸附量。研究了3种不同纳米流体的最佳浓度和平衡吸附时间，明确了纳米流体在页岩表面的吸附类型以及温度对其吸附规律的影响，进一步探讨了纳米流体改变润湿性的吸附机理。结果表明：SD、GP、DG 3种纳米流体的平衡吸附时间均为25 min；随着温度升高，纳米流体的平衡吸附量出现不同程度减少，纳米流体在页岩颗粒表面的吸附规律符合Langmuir单层吸附曲线；纳米流体均能够改变页岩表面的润湿性，SD、GP纳米流体能够实现页岩表面的润湿反转。研究成果为纳米流体在页岩油藏增产中的进一步应用推广提供了依据。
Nanofluids are often used to enhance oil recovery of unconventional reservoirs. In order to clarify their adsorption laws and mechanism on shale surface, Lambert-Beer law is used to study adsorption laws of nanofluids on shale surface based on the relationship between absorbance and adsorption amount. Nanofluids are mixed with shale powder and oscillated, controlling the temperature to achieve adsorption equilibrium and measuring the change in solution concentration to calculate the adsorption amount. The optimum concentration and equilibrium adsorption time of 3 different nanofluids are studied to determine adsorption types of nanofluids on shale surface and the influence of temperature on their adsorption laws, and adsorption mechanism of nanofluids changing wettability is further discussed. The results show that, equilibrium adsorption times of SD, GP and DG nanofluids are all 25 min. With the increase of temperature, equilibrium adsorption amount of nanofluids decreases in various degrees, and adsorption laws of nanofluids on shale particles surface conform to Langmuir monolayer adsorption curve. All nanofluids can change the wettability of shale surface, and SD and GP nanofluids can achieve wettability reversal of shale surface. The research provides basis for further application and promotion of nanofluids in shale reservoir stimulation.

关键词(KeyWords)： 纳米流体;页岩;润湿性;吸附量;吸附规律
nanofluid;shale;wettability;absorption amount;adsorption law

Abstract:

Keywords:

基金项目(Foundation): 黑龙江省“揭榜挂帅”科技攻关项目“古龙页岩油提高采收率关键问题研究”（DQYT-2022-JS-761）;; 国家自然科学基金项目“古龙页岩二氧化碳驱油及安全埋存过程中赋存状态及流动机理研究”（U23A20596）;国家自然科学基金项目“海上高温高盐油田活性纳米流体非连续变循环提高采收率关键基础问题研究”（U22B6005）

作者(Author): 赵宇,张剑,蒋庞露,邓森,贺亮,宫连杰,梁立豪
ZHAO Yu,ZHANG Jian,JIANG Panglu,DENG Sen,HE Liang,GONG Lianjie,LIANG Lihao

DOI: 10.19597/J.ISSN.1000-3754.202409048

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