Investigating hydrate formation and flow properties in water-oil flow systems in the presence of wax

流量保证 笼状水合物 水合物 压力降 石油工程 体积流量 浊点 流量(数学) 化学工程 材料科学 化学 环境科学 地质学 热力学 机械 复合材料 水溶液 工程类 有机化学 物理
作者
Yang Liu,Jiawei Meng,Xiaofang Lv,Qianli Ma,Bohui Shi,Chuanshuo Wang,Huirong Huang,Chengxuan Wu,Shidong Zhou,Shangfei Song
出处
期刊:Frontiers in Energy Research [Frontiers Media]
卷期号:10 被引量:4
标识
DOI:10.3389/fenrg.2022.986901
摘要

The coexistence of wax and hydrates will pose intractable challenges to the safety of offshore oil and gas production and transportation, especially for deep sea or ultra-deep sea reservoirs. Understanding the effect of wax crystals on hydrate formation, flow properties, and plugging risks of flow systems is imperative to the flow assurance industry. Experiments using systems composed of natural gas, water-in-oil emulsion with different wax contents, and AA (anti-agglomerant) were conducted in a high-pressure flow loop. For wax-containing systems, wax precipitates out during the induction period of hydrate formation. The induction time of hydrate formation decreased with the increasing wax content under the experimental conditions in this work. It was also found that the induction time for both wax-free and wax-containing systems increased with the increasing flow rate. The hydrate growth rate and the cumulative gas consumption were significantly reduced due to the existence of wax. Although the hydrate volume fraction of wax-containing systems was much smaller than that of wax-free systems, a stable slurry flow state could not be reached for wax-containing systems, the pressure drop of which gradually increased with the decreasing flow rates. The coexistence of wax and hydrates results in the deterioration of transportability and higher plugging risks. Based on the Darcy–Weisbach hydraulic formula, a dimensionless parameter was defined to characterize the plugging risk of flow systems with the coexistence of wax and hydrates. Additionally, regions with different levels of plugging risks could be evaluated and divided.
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