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.

关键字：flow assurance; plugging risk; flow loop; induction time; hydrate growth rate

ISSN号：2296-598X

卷、期、页：卷: 10

发表日期：2022-09-23

影响因子：4.008000

期刊分区（SCI为中科院分区）：三区

收录情况：SCIE（科学引文索引网络版）,EI（工程索引）

发表期刊名称：FRONTIERS IN ENERGY RESEARCH

参与作者：柳扬,孟江伟,吕晓方,马千里,王传硕,黄辉荣,吴晨轩,周诗岽

第一作者：史博会,宋尚飞

论文类型：期刊论文

论文概要：柳扬,孟江伟,吕晓方,马千里,史博会,王传硕,黄辉荣,吴晨轩,周诗岽,宋尚飞，Investigating hydrate formation and flow properties in water-oil flow systems in the presence of wax，FRONTIERS IN ENERGY RESEARCH，2022，卷: 10

论文题目：Investigating hydrate formation and flow properties in water-oil flow systems in the presence of wax