在以石油为主导的系统中,NaCl对甲水合物的动力和热力学影响
Abdulrab Abdulwahab Almashwali1,2, Mazlin Idress3, Bhajan Lal1,2
1Chemical Engineering Department, Universiti Teknologi PETRONAS, Bandar Seri Iskandar, Perak 32610, Malaysia.
ACS omega
|December 4, 2023
概括
化 (NaCl) 显示了甲 (CH4) 水合物形成的最小动力抑制,但显著增强了热力学抑制. 钻油增加了甲水合物诱导时间,而NaCl则改变了平衡曲线,影响了水合物稳定性.
科学领域:
- 地质化学 地质化学
- 物理化学 物理化学
- 石油工程是石油工程中的一个.
背景情况:
- 甲 (CH4) 水合物是一种类似冰的结构,可以捕获天然气.
- 了解抑制效应对于石油和天然气运营至关重要.
- 化 (NaCl) 是一种常见的抑制剂,但其在石油主导系统中的性能需要详细研究.
研究的目的:
- 研究化 (NaCl) 对甲水合物形成的动力学和热力学抑制.
- 为了评估NaCl在纯水和石油主导系统中的影响.
- 量化NaCl对水合物平衡曲线和动力学的影响.
主要方法:
- 使用高压反应堆细胞进行实验研究.
- 通过诱导时间评估的动力抑制在1%重量NaCl,8MPa和274.15K时.
- 用同位素T循环技术测量热力学抑制 (3重% NaCl,4.0-9.0 MPa,276.5-286.0 K) 来确定水合液体-蒸汽平衡 (HLwVE) 曲线.
主要成果:
- 在动力学上,NaCl表现出轻微或完全没有抑制,而钻油增加了诱导时间.
- 在热力学上,NaCl显著地将HLwVE曲线转向更高的压力和更低的温度.
- 在石油系统中,NaCl增加了0.04-0.15MPa的压力,并降低了1-3K的温度,这是由于水的活动减少.
结论:
- NaCl是一种比甲水合物的动力抑制剂更有效的热力学抑制剂.
- 油的存在通过增加诱导时间来增强动力抑制.
- NaCl的热力学抑制是压力依赖的,由于水活性增加,在更高的压力 (9 MPa) 上效率更高.
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