石油钻采工艺2017，Vol.39Issue(4)：442-448,7.DOI:10.13639/j.odpt.2017.04.009
有机胺抑制蒙脱石水化机理的分子模拟
Molecular simulation on the inhibition mechanism of organic amine to montmorillonite hydration
摘要
Abstract
Wellbore instability has always been the major difficulty in the process of well drilling, and mud shale hydration is one of the most important factors leading to wellbore instability. Montmorillonite, as the composition with the highest water absorption and the main component in mud shale, is the radical factor of wellbore instability. In this paper, the molecular structure model for the reac-tion between organic amine inhibitors and Na-montmorillonite was established by means of molecular simulation to study the inhibition mechanisms of small-molecule organic amine inhibitors (e.g. formamide and urea) to montmorillonite hydration. It is shown that the inhibition capacity of small-molecule organic amine mainly depends on its molecular structure and functional group. Formamide and urea can form hydrogen bond with the interlayer hydrone and the oxygen on the surface of montmorillonite to inhibit the hydration of interlayer sodion and limit the self-diffusion of interlayer hydrone and sodion. When the concentrations of formamide and urea change, their effects on the density and mechanical performance of Na-montmorillonite are different, but they follow the same change laws. There is a certain critical concentration, below which the addition of amine can increase the density of montmorillonite, increasing the mechanical performance of this system, and vice versa. And at low concentration, they both can present good inhibition and increase the stability of montmorillonite. Based on the parameter analysis and comparison, formamide is, on the whole more effective than urea.关键词
蒙脱石/分子动力学模拟/水化膨胀/页岩抑制剂/甲酰胺/尿素Key words
montmorillonite/molecular dynamics simulation/hydrate expansion/shale inhibitor/formamide/urea分类
能源科技引用本文复制引用
黄小娟,徐加放,丁廷稷,李小迪,李力文..有机胺抑制蒙脱石水化机理的分子模拟[J].石油钻采工艺,2017,39(4):442-448,7.基金项目
国家重点基础研究发展计划 973 项目"海洋深水油气安全高效钻完井基础研究"(编号:2015CB251200) （编号:2015CB251200）
油气重大专项"大型油气田及煤层气开发"(编号:2016ZX05044003-001). （编号:2016ZX05044003-001）
