Development and Testing of a Graphene-Modified Sponge Coring Tool
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摘要: 为了直接测量、准确获取岩心的含油饱和度，进行了石墨烯改性海绵取心工具的研制与试验研究。对常规海绵经石墨烯溶胶进行了浸渍、老化、超临界干燥等工艺改性处理，得到了石墨烯海绵材料。该海绵内部孔隙直径可调，常温下原油吸附量可达自身质量的80.5倍。在此基础上，设计开发了石墨烯改性海绵取心工具。采取预充海绵保护液和设置密封活塞方式对海绵材料进行防污染保护，通过室内试验确定海绵衬筒直径小于岩心直径0.6～1.0 mm，采用长条薄片压紧方式保护海绵内衬，使之同时满足了吸油和岩心进筒要求。通过与含油饱和度常规计算方法进行比较，确定了岩心含油饱和度的测量、计算方法。石墨烯改性海绵取心工具可在不影响取心收获率的前提下收集岩心逸出的原油，具有较好的推广应用前景。Abstract: In order to directly measure and accurately obtain the oil saturation of cores, processes such as graphene gel impregnation, aging and supercritical drying were used in conjunction with a conventional sponge to obtain the graphene sponge material with an adjustable pore diameter. At room temperature, crude oil absorption of graphene sponge material is as high as 80.5 times its own mass, and the graphene modified sponge coring tool is designed and developed. The grapheme modified sponge coring tool adopts pre-filled sponge protection fluid and a sealed piston to protect the sponge material from being polluted. Through indoor laboratory experiments, the diameter of sponge liner is determined to be 0.6–1.0 mm less than that of the core, and a strip sheet is used to press and protect the sponge liner while satisfying the requirement of oil absorption and core feeding. Based on the comparison with conventional methods, the measurement and calculation methods of the oil saturation of cores are determined. This new sponge coring tool can effectively collect the crude oil escaping from the core without compromising the core recovery. Therefore, it demonstrates a high potential for application.
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Keywords:
- graphene /
- modified sponge /
- coring tool /
- oil saturation /
- calculation method
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图 1 海绵取心工具结构示意
1.上接头；2.悬挂分水总成；3.取心外筒；4.浮动活塞；5.注液排气总成；6.取心内筒；7.海绵衬筒；8.岩心爪总成；9.单流阀活塞；10.取心钻头
Figure 1. Schematic diagram of a sponge coring tool
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图 2 不同孔径的石墨烯改性海绵材料扫描电镜照片
Figure 2. SEM images of a graphene modified sponge materialwith different pore sizes
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图 4 石墨烯海绵的油、水接触角性能调控结果
Figure 4. Oil and water contact angle adjustment by graphene modified sponge
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图 5 海绵取心含油饱和度分析
Figure 5. Oil saturation analysis of core sampled by sponge coring tool
表 1 部分石墨烯改性海绵样品的基本性能参数
Table 1 Basic performance parameters of partial graphene modified sponge samples
样品
编号密度/
（mg·cm−3）热导率/
（W·m−1·K−1）水接触角/
（°）孔径/
μm吸油倍率/（g·g−1） 正己烷 原油 S0 9.0 0.025 137 67 14.7 21.5 S1 9.0 0.024 139 125 69.0 80.5 S2 9.0 0.027 140 172 62.0 71.6 S3 12.5 0.021 146 153 65.0 75.8 S4 98.0 0.057 144 91 4.8 9.5 S5 152.0 0.058 141 45 3.6 5.4 S6 217.0 0.068 145 16 1.5 2.9 
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