Inhibitory effect of water-based drilling fluid on methane hydrate dissociation
Inhibitory effect of water-based drilling fluid on methane hydrate dissociation
复制标题
水基钻井液对甲烷水合物解离的抑制作用
DOI：
10.1016/j.ces.2018.12.057
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发表时间：
2019-05-18
影响因子：
4.7
通讯作者：
Zhang, Yubin
中科院分区：
文献类型：
--
作者：
Zhao, Xin;Qiu, Zhengsong;Zhang, Yubin
水合物分解是钻井作业中水合物沉积物中的一个重要问题。钻井液与水合物直接接触，了解其对水合物分解的抑制作用对于在钻井操作期间稳定水合物是重要的。设计了一套钻井液水合物分解实验装置，研究了热力学水合物抑制剂（THIs）、聚乙烯吡咯烷酮（PVP）和大豆卵磷脂对水合物分解的影响。还研究了水基钻井液在潜在水合物分解抑制剂存在下的抑制效果。一个意想不到的抑制效果发生与乙二醇（EG）在浓度低于10重量%，导致一系列的因素，包括解离驱动力，质量和热量传递的EG溶液。PVP和卵磷脂降低了水合物的解离速率，增加了水合物完全解离所需的时间。因此，这些可用于水基钻井液中以抑制水合物分解。考虑到水合物解离抑制剂的抑制效果以及与钻井液的相容性，选择0.1wt%的PVP和0.5wt%的卵磷脂组合作为最佳的水合物解离抑制剂。使用浓度低于10重量%的EG代替NaCl作为THI也可以帮助抑制水合物解离。研究结果为水合物沉积物钻井液的开发和设计提供了依据。(C)2019爱思唯尔有限公司版权所有。
Hydrate dissociation poses a significant problem during drilling operations in hydrate-bearing sediments. The drilling fluid is in direct contact with hydrates, and understanding its inhibitory effect on hydrate dissociation is important for stabilizing hydrates during drilling operations. In this work, an apparatus was designed for investigating hydrate dissociation in drilling fluids, and the effects of thermodynamic hydrate inhibitors (THIs), polyvinyl pyrrolidone (PVP), and soybean lecithin on hydrate dissociation were studied. The inhibitory effect of a water-based drilling fluid in the presence of the potential hydrate dissociation inhibitors was also studied. An unexpected inhibitory effect occurred with ethylene glycol (EG) at concentrations below 10 wt%, resulting from a range of factors including the dissociation driving force, and mass and heat transfers in the EG solution. PVP and lecithin reduced the hydrate dissociation rate and increased the time required for complete dissociation of hydrates. These can, therefore, be used in waterbased drilling fluids to inhibit hydrate dissociation. A combination of 0.1 wt% PVP and 0.5 wt% lecithin was selected as an optimal hydrate dissociation inhibitor, considering its inhibitory effect and compatibility with the drilling fluid. Using EG at a concentration below 10 wt% as a THI instead of NaCl can also help inhibit hydrate dissociation. The findings of this work provide a basis for the development and design of drilling fluids for drilling in hydrate-bearing sediments. (C) 2019 Elsevier Ltd. All rights reserved.