التفاصيل البيبلوغرافية
| العنوان: |
页岩油井筒结蜡力学性能 参数变化分子动力学模拟及其特征. (Chinese) |
| Alternate Title: |
Molecular Dynamics Simulation of Wax Deposition in Shale Oil Wells: Variation of Mechanical Properties and Characteristics. (English) |
| المؤلفون: |
张 炜, 徐毓珠, 文义民, 刘建仪, 郎东阁 |
| المصدر: |
Special Oil & Gas Reservoirs; Dec2025, Vol. 31 Issue 6, p151-158, 8p |
| Abstract (English): |
In view of the unclear understanding of the variation law of mechanical properties of wax blocks during the wax deposition process in terrestrial facies shale oil and gas fields, taking nC5H12 -nC24H50 as an example, the diffusion and aggregation behavior of wax molecules in waxy shale oil were studied by molecular dynamics simulation, the mechanical parameters of wax blocks and their variation with temperature were analyzed. The findings reveal that when the temperature exceeds 50 ℃, the wax molecules are loosely distributed, and the elastic modulus and Poisson′ s ratio of waxy shale oil are 0. With the decrease of temperature, the distance between wax molecules decreases, and the viscosity, elastic modulus and Poisson′s ratio of waxy shale oil increase, and ultimately evolving into wax crystals. At the same temperature, the shear modulus of the wax block is lower than its bulk modulus, making the wax block more susceptible to detachment from the pipe wall due to shear forces. When the temperature falls below 50 ℃, the shear modulus of wax becomes positive, indicating the onset of wax deposition in the wellbore, and the wax removal operation needs to be carried out. As the shear modulus of wax increases, the sequence of wax removal methods is hot washing, chemical wax removers, and wellbore scraping. This study quantitatively obtained the variation law of mechanical parameters of wax deposition in shale oil and gas wells with temperature, which is helpful to guide the formulation of wax removal and prevention measures. [ABSTRACT FROM AUTHOR] |
| Abstract (Chinese): |
针对陆相页岩油气田井筒结蜡过程中蜡块力学性能参数变化规律认识不清的问题,以 nC5H12 -nC24H50 为例,利用分子动力学模拟的方法,研究含蜡页岩油中蜡分子的扩散与聚集行 为,并分析蜡块力学参数及其与温度的变化规律。研究发现:当温度高于50 ℃时,蜡分子分布 松散,含蜡页岩油的弹性模量与泊松比为0,随着温度的降低,蜡分子之间的距离减小,含蜡页 岩油的黏度、弹性模量与泊松比升高,最终发展成蜡状晶体。在同一温度下,蜡块的剪切模量 低于体积模量,此时蜡块更容易受到剪切力从管壁脱落。当温度低于50 ℃时,蜡的剪切模量 大于0,说明此时井筒开始结蜡,需要进行清蜡操作。随着蜡的剪切模量增大,清蜡方式依次 选择为热洗清蜡、化学清蜡剂清蜡、井筒通井刮蜡。该研究定量获得了页岩油气井结蜡力学参 数与温度的变化规律,有利于指导清防蜡措施方案的制订. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |