Experimental and numerical simulation analyses of selective fragmentation of coal samples by plasma

Zhang, Xiangliang; Lin, Baiquan; Zhu, Chuanjie; Li, Yanjun; Yan, Fazhi

doi:10.1016/j.fuel.2019.115717

Cited by 12 publications

(1 citation statement)

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“…Thus, a fast, in situ, and eco-friendly active control over the tight sandstones to efficiently enhance oil recovery will be a significantly welcome and urgent need . To date, several electric field-related experiments indicate that the production of oil and gas of reservoirs can be significantly improved by an electric field, − pointing out that the electric field method exhibits an impressive potential application to oil fields. Therefore, research on the changes in the molecular groups of tight sandstones subjected to an electric field is necessary to lay the groundwork in establishing the theoretical knowledge to guide the development of tight sandstones with electric field-related technologies.…”

Section: Introductionmentioning

confidence: 99%

Unveiling the Changes in the Molecular Groups of Tight Sandstones in Response to an Electric Field

et al. 2021

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The electric field method proved in the lab and oil fields is an effective and fast way to significantly improve oil recovery, which can be applied to greatly realize the urgent-need requirements for energy, especially in tight sandstones. Generally, the changed molecular groups treated with an electric field modulate the wettability of reservoirs, affecting the final oil recovery. Herein, the investigation of the impact of the electric field on the molecular groups of reservoirs is imperative and meaningful. In this paper, tight sandstones were placed into a particular instrument and subjected to various strengths of the electric field. Nine treated powders and one untreated powder of tight sandstones were processed by Fourier transform infrared spectroscopy (FTIR) and Xray photoelectron spectroscopy (XPS) experiments. FTIR results show that the electric field decreases aromatic groups, C−O groups, COOH groups, and aliphatic groups, whereas it increases CC groups, CO groups, and OH groups. Interestingly, the changes in C−O groups, CO groups, COOH groups, and OH groups are all the competitive results of production and consumption during the treatment process. With regard to C−O groups and COOH groups, the consumption has an advantage over the production on the content of functional groups, and the situations for C=O groups and OH groups exhibit a contrary trend. The fitted result of XPS proves the fact that the electric field improves CO groups, OH groups, and COOR groups, whereas it reduces C−O groups, supporting that the molecular groups can be mutually transformed during the electric field treatment. The obtained knowledge is beneficial to the study of electric field-related technologies on the molecular groups of reservoirs.

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