Investigation of Asphaltene Deposition and Precipitation in Production Tubing

• 作者: Abdolvahab Rastgoo Riyaz Kharrat
• 来源期刊: 清洁煤炭能国际期刊(英文)
• 学科: 医学
• 关键词: ASPHALTENE PRECIPITATION ASPHALTENE DEPOSITION Wellbore PRODUCTION DECLINE
• 年，卷（期）: 2017,（1）
• 页码范围: 14-29
• 页数: 16页
• 分类号: R73

摘要

Asphaltenes are complex molecular entities, which together with resins, aromatic hydrocarbons and saturates forms the crude oil. Asphaltenes and resins are in the thermodynamic equilibrium at static reservoir condition. However, asphaltene can precipitate due to changes in thermodynamic condition. Asphaltene deposition in production tubings has been an outstanding problem with wide economic impact on the oil industry. Meanwhile, the use of real-time tools to monitor depositions along the well is of great difficulty. In this work, the asphaltene precipitation region in a single phase flow wellbore is predicted for an oil well of the Iranian oil field. Then, asphaltene deposition thickness along the well is predicted for three time intervals. The simulation results indicated that asphaltene thickness exceeded more than 50% of tubing radius;therefore, a reduction in flow rate, an increase in pressure drop and tubing blockage are expected. Moreover, it is shown the deposits thickness along the wellbore has approximately a skew normal distribution shape, which could be the result of increases in velocity and excess pressure drop.