Zhaozhong Yang , Wanyu Luo , Liehui Zhang , Jingyi Zhu , Xiaogang Li , Yulong Zhao , Xin Chen , Chen Liu
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引用次数: 0
摘要
SC-CO2压裂技术是非常规油气藏绿色开采的可行方法。然而,由于在 SC-CO2 压裂过程中存在运砂等一系列问题,CO2 增稠成为当前研究的重点。聚合物增稠剂已广泛应用于油田。由于实验室实验的宏观性和局限性,我们一直未能阐明聚合物增稠 CO2 的微观机理以及添加聚合物后井下 CO2 压裂液体系的粘度变化。在本研究中,我们使用 COMPASSII 力场进行了全原子建模和分子模拟。我们选择了九种聚合物,研究它们的微观特性及其影响因素。最后,我们结合油田一口井的数据,模拟了在二氧化碳压裂施工条件下,井筒中添加聚合物增粘剂后二氧化碳体系的粘度变化。
A molecular dynamics investigation into the polymer tackifiers in supercritical CO2 fracturing fluids under wellbore conditions
SC-CO2 fracturing technology is a feasible method for green extraction of unconventional oil and gas reservoirs. However, due to a series of problems such as sand transportation during SC-CO2 fracturing, CO2 thickening has become the focus of current research. Polymer thickeners have been widely used in oilfields. Due to the macroscopic nature and limitations of laboratory experiments, we have not been able to elucidate the microscopic mechanism of polymer thickening CO2 and the viscosity change of the CO2 fracturing fluid system downhole after polymer addition. In this study, we used all-atom modeling and molecular simulation of the COMPASSII force field. We selected nine polymers to study their microscopic properties and the factors affecting their effects. Finally, we simulated the viscosity change of the CO2 system after the addition of polymer tackifiers in the wellbore under the CO2 fracturing construction conditions by combining the data from one well in the oilfield.
期刊介绍:
The Journal of Supercritical Fluids is an international journal devoted to the fundamental and applied aspects of supercritical fluids and processes. Its aim is to provide a focused platform for academic and industrial researchers to report their findings and to have ready access to the advances in this rapidly growing field. Its coverage is multidisciplinary and includes both basic and applied topics.
Thermodynamics and phase equilibria, reaction kinetics and rate processes, thermal and transport properties, and all topics related to processing such as separations (extraction, fractionation, purification, chromatography) nucleation and impregnation are within the scope. Accounts of specific engineering applications such as those encountered in food, fuel, natural products, minerals, pharmaceuticals and polymer industries are included. Topics related to high pressure equipment design, analytical techniques, sensors, and process control methodologies are also within the scope of the journal.