天然气水合物动力学抑制剂与水分子相互作用研究

The Interaction between Gas Hydrate Kinetics Inhibitors and Water Molecules

牛洪波 于政廉 孙菁 徐加放

NIU Hongbo YU Zhenglian SUN Jing XU Jiafang

中石化胜利石油工程有限公司钻井工艺研究院，山东东营 257000 中国石油大学（华东）石油工程学院，山东青岛 266580 中石化石油工程技术服务股份有限公司国际石油工程有限公司，北京 100029

Drilling Technology Research Institute, Sinopec Shengli Oilfield Service Corporation, Dongying, Shandong, 257000, China School of Petroleum Engineering, China University of Petroleum (Huadong), Qingdao, Shandong, 266580, China International Petroleum Engineering Co., Ltd., Sinopec Oilfield Service Corporation, Beijing, 100029, China

为了解天然气水合物动力学抑制剂的分子结构对其抑制性能的影响，分析了不同结构动力学抑制剂与水分子之间的相互作用规律。采用分子模拟方法，分别研究了含有环状结构的动力学抑制剂PVP和PVCap，含有链状结构的动力学抑制剂PMC，以及同时含有环状结构和链状结构的新型动力学抑制剂YZ与水分子之间的相互作用。研究发现，动力学抑制剂与水分子间的相互作用与动力学抑制剂结构密切相关：具有环状结构的动力学抑制剂可以有效降低溶液中水分子的扩散系数，具有链状结构的动力学抑制剂可以与水分子形成更多的氢键，同时具有环状结构与链状结构的动力学抑制剂其抑制性更强。研究结果进一步明确了动力学抑制剂分子结构对其抑制性能影响的机理，对研制天然气水合物动力学抑制剂具有指导意义。

In order to understand the influence of the molecular structure of gas hydrate kinetics inhibitors on its inhibitory performance, the interactions between kinetics inhibitors with different structures and water molecules were analyzed. By utilizing a molecular simulation method, the interactions between water molecules with the cyclic structure-bearing kinetic inhibitors (PVP and PVCap), the chain structure-bearing kinetic inhibitor (PMC), and the novel kinetic inhibitor containing both cyclic structure and chain structure (YZ) were studied. The study found that the interactions between kinetics inhibitors and water molecules were closely related to the structures of kinetic inhibitors. First, the cyclic structure-bearing kinetic inhibitors could effectively reduce the diffusion coefficient of water molecules in the solution. Second, the chain structure-bearing kinetic inhibitor could form more hydrogen bonds with water molecules, and the kinetic inhibitor containing both cyclic structure and chain structure presented stronger inhibition. The study results further clarified the influencing mechanism of kinetic inhibitor molecular structure on its inhibition performance, which demonstrated itself to be effective for guiding the development of gas hydrate kinetic inhibitors.

国家重点基础研究发展计划（“973”计划）项目“深水钻井液体系优化设计”（编号：2015CB251206）、国家自然科学基金项目“深水水基钻井液低温流变性调控用温敏聚合物研制及作用机理研究”（编号：51874343）和“安全高效井筒工作液构建及调控方法基础研究”（编号：U176221）、中国石化集团科技攻关项目“深水钻井井筒内预防天然气水合物技术（编号：JP14013）”、山东省自然科学基金项目“深水钻井液低温流变性调控用温敏聚合物的研制及作用机理研究”（编号：ZR2017MEE027）联合资助

https://doi.org/10.11911/syztjs.2019037