Petroleum Science >2019,??Issue 6:??1-12 DOI: https://doi.org/10.1007/s12182-019-00376-2
Effect of dilute acid treatment on adhesion properties of Longmaxi black shale Open?Access
文章信息
作者：Pan-Pan Zhang, Shou-Ceng Tian, Mao Sheng, Tian-Yu Wang, Waleed Ali Khan, Quan Xu, Li-Zhi Xiao
作者单位：
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing, China; Harvard SEAS-CUPB Joint Laboratory on Petroleum Science, Cambridge, USA
投稿时间：2019-04-12
引用方式：Zhang, PP., Tian, SC., Sheng, M. et al. Pet. Sci. (2019). https://doi.org/10.1007/s12182-019-00376-2
文章摘要
Properties of shale in an acid environment are important when acid or CO2 is injected into geologic formations as a working fluid for enhanced oil and gas recovery, hydraulic fracturing and reduced fracture initiation pressure. It has previously been shown that acid fluids can enhance the formation conductivity and decrease the hardness of shale. However, less is known about the effect of dilute acid on the adhesion properties of shale. In the study, shale samples are characterized in detail with advanced analysis. Adhesion properties of shale via dilute acid treatment were revealed by atomic force microscopy (AFM) for the first time. Results indicate that acid treatment can greatly enhance adhesion forces of the shale surface. After acid treatment, the average adhesion forces show a platform-like growth with an increase in loading force. Through analysis of results from AFM, scanning electron microscopy, and X-ray diffraction, we affirm that the enhanced adhesion forces are mainly from increased specific surface area and reduced elastic modulus. The results presented in this work help understand the adhesion properties of shale oil/gas present in an acidic environment, which have great significance in unconventional resources development.
关键词
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Shale, Acid, Carbonates, Atomic force microscope, Adhesion force