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李立宗, 苏俊霖, 赵洋, 左富银. 高温高压下蒙脱石水化特性的分子模拟[J]. 钻井液与完井液, 2021, 38(3): 265-270. doi: 10.3969/j.issn.1001-5620.2021.03.001
引用本文: 李立宗, 苏俊霖, 赵洋, 左富银. 高温高压下蒙脱石水化特性的分子模拟[J]. 钻井液与完井液, 2021, 38(3): 265-270. doi: 10.3969/j.issn.1001-5620.2021.03.001
LI Lizong, SU Junlin, ZHAO Yang, ZUO Fuyin. Molecular Simulation of the Hydration of Montmorillonite under High-temperature and Highpressure[J]. DRILLING FLUID & COMPLETION FLUID, 2021, 38(3): 265-270. doi: 10.3969/j.issn.1001-5620.2021.03.001
Citation: LI Lizong, SU Junlin, ZHAO Yang, ZUO Fuyin. Molecular Simulation of the Hydration of Montmorillonite under High-temperature and Highpressure[J]. DRILLING FLUID & COMPLETION FLUID, 2021, 38(3): 265-270. doi: 10.3969/j.issn.1001-5620.2021.03.001

高温高压下蒙脱石水化特性的分子模拟

doi: 10.3969/j.issn.1001-5620.2021.03.001
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    作者简介:
  • 中图分类号: TE254

Molecular Simulation of the Hydration of Montmorillonite under High-temperature and Highpressure

  • 摘要: 页岩中黏土矿物的水化膨胀是影响页岩气井井壁稳定性的一个重要因素,蒙脱石作为黏土矿物的主要成分,其水化机理对于解决页岩气井井壁失稳问题至关重要。为了深入探索高温高压地层环境下蒙脱石的水化机理,利用分子模拟软件从微观角度研究了不同水化程度的蒙脱石在不同温度压力条件下的晶层间距、晶层间物质的移动规律、离子水化参数以及力学参数的变化。研究结果表明:温度增加、压力降低时,蒙脱石层间距随之增加,且温度对层间距的影响较大,层间距范围在1.823~2.042 nm之间;层间水分子和钠离子的扩散速率随温度增加而加快,随压力升高而减慢;低温高压时钠离子的水化配位数较大,配位数范围在2.35~4.35之间;温度增加时,蒙脱石晶体的体积模量、剪切模量以及弹性模量随之减小,泊松比随之增加,而压力对蒙脱石晶体力学参数的影响却恰恰相反。可见,本文的研究结果对于高温高压地层环境下页岩地层水化机理的研究具有重要的理论指导意义。

     

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  • 收稿日期:  2021-02-25

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