埃及西部沙漠逆行凝析气藏注热提高油气产量

Maged Alaa Taha, Eissa Shokier, A. Attia, A. Yahia, K. Mansour
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摘要

在逆行凝析气藏中,凝析液堵塞是一个主要的储层损害问题,即天然气中的液体在露点压力以下析出。尽管由于未达到临界饱和,大部分液体不会产生,但天然气将被积聚的液体堵塞,也不会产生。这项工作研究了在高温下注气(如甲烷、二氧化碳和氮气)和蒸汽对埃及一个逆行凝析气藏的影响。根据注气温度、注气焓、注气类型(CO2、N2和CH4)以及注气速率的不同组合,进行了几种注气方案。结果表明,所有常规注气和热注气方案都不会比枯竭方案增加累积产气量。非热注气方案使凝析油累计产量提高了8.6%。然而,热CO2注入使凝析油累计产量提高了28.9%。结果表明,在相同的储层压力趋势下,注热气对凝析油的蒸发作用并不比常规注热气大。然而,热注入主要提高了凝析油的流动性。逆行储层的热注主要适用于已经排出了最大量的非生产液体的枯竭储层。最后,本研究研究了在逆行凝析气藏中实施热注气的操作,考虑了以下项目:二氧化碳回收装置、压缩机、储罐、防腐管线和管柱、缓蚀剂以及井下气体加热器。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Enhancing Hydrocarbon Production Through Thermal Gas Injection from a Retrograde as Condensate Reservoir in the Western Desert in Egypt
In retrograde gas condensate reservoirs, condensate blockage is a major reservoir damage problem, where liquid is dropped-out of natural gas, below dew-point pressure. Despite that most of this liquid will not produce due to not reaching the critical saturation, natural gas will be blocked by the accumulated liquid and will also not produce. This work investigates the effects of gas injection (such as methane, carbon-dioxide, and nitrogen) and steam at high temperatures on one of the Egyptian retrograde gas condensate reservoirs. Several gas injection scenarios that comprise different combination of gas injection temperature, enthalpy, injection gas types (CO2, N2, and CH4), and injection-rates were carried out. The results indicated that all conventional and thermal gas injection scenarios do not increase the cumulative gas production more than the depletion case. The non-thermal gas injection scenarios increased the cumulative condensate production by 8.6%. However, thermal CO2 injection increased the condensate production cumulative by 28.9%. It was observed that thermal gas injection does not vaporize condensate It was observed that thermal gas injection does not vaporize condensate more than conventional injection that have the same reservoir pressure trend. However, thermal injection mainly improves the condensate mobility. Appropriately, thermal injection in retrograde reservoirs, is mostly applicable for depleted reservoirs when the largest amount of non-producible liquid is already dropped out. Finally, this research studied executing thermal gas injection in retrograde gas condensate reservoirs, operationally, by considering the following items: carbon dioxide recovery unit, compressors, storage-tanks, anti-corrosion pipe-lines and tubing-strings, and corrosion-inhibitors along with downhole gas heaters.
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