Preparation and characterization of expanded graphite/modified n-alkanes composite phase change material for drilling in hydrate reservoir

被引：0
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作者：
Zhang, Yubin [1 ]
Qiu, Zhengsong [1 ]
Zhong, Hanyi [1 ]
Mu, Jiaxing [1 ]
Ma, Yongle [2 ]
Zhao, Xin [1 ]
Huang, Weian [1 ]
机构：
[1] School of Petroleum Engineering, China University of Petroleum (East China), Qingdao,266580, China
[2] Bo-Xing Division of CNPC Offshore Engineering Company Limited, Tianjin,300451, China
来源：
Chemical Engineering Journal | 2022年 / 429卷
关键词：
During the process of hydrate reservoir drilling; the heat generated by friction in a horizontal well section leads to hydrate decomposition and affects the wellbore stability. Consequently; the low-temperature environment of subsea wellbores can cause hydrate regeneration and flow obstacles. In this study; modified n-alkanes (MNA) with an appropriate phase transition temperature and acceptable latent heat were synthesised; and the thermal conductivity was improved by adding nano-Cu. A composite phase change material (PCM) was prepared using expanded graphite (EG) with adsorbing MNA; and nano-silica modification to improve its hydrophilicity and stability. Structural properties of the composite PCM were characterised via scanning electron microscopy (SEM); X-ray diffraction (XRD); Fourier transform infrared (FT-IR) spectroscopy; and nitrogen sorption. The DSC curves revealed an acceptable latent heat capacity and reliability of the prepared composite PCM. In addition; by simulating the temperature heating and cooling during the drilling process; the composite PCM exhibited a reasonable thermoregulating and hydrate decomposition inhibition performance; which can effectively inhibit hydrate decomposition in reservoirs and hydrate regeneration in wellbores. Moreover; the composite PCM exhibited a reasonable compatibility with the drilling fluid. The study results can be applied to realise intelligent temperature control and reduce the risk of drilling in hydrate reservoirs. © 2021 Elsevier B.V;
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