Scholarlink

<p>Oil-rim reservoirs present persistent challenges for oil recovery because of their thin oil zones, strong aquifer support, and large gas caps, which often cause early gas breakthrough and unstable production. Addressing these challenges is vital for sustaining production in many mature fields worldwide. Water-alternating-gas (WAG) injection is widely recognized for improving sweep efficiency, controlling gas production, and maintaining reservoir pressure. In this study, a calibrated dynamic reservoir model of the Halewah Field in Yemen was developed to compare two water-supply strategies for WAG injection: reinjection of produced water and the use of an external water source. The results showed that relying solely on produced water is insufficient for long-term pressure support, whereas WAG with external water supply increased the oil recovery factor from 23.7% to 30.4% and reduced the gas–oil ratio by about 38%. These findings demonstrate that ensuring a reliable water source is critical for the success of WAG operations in oil-rim reservoirs. Unlike previous studies that mainly focused on WAG cycle design or gas management, this work highlights the strategic role of water sustainability in enabling WAG effectiveness, thereby offering new insights for optimizing recovery in fields with similar geological and operational constraints. Unlike conventional WAG studies focusing on cycle optimization, this work establishes water sourcing as the fundamental strategic variable, providing a new decision-making framework for oil rim development.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Comparative evaluation of water injection sources for WAG recovery in an oil rim reservoir: a case study from Halewah Field, Yemen

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月8日

查看全文
  • Adel M. Almatary,
  • Riyadh G. Aldheeb,
  • Mohammed A. Mokaber,
  • Osamah A. Alrool

摘要

Oil-rim reservoirs present persistent challenges for oil recovery because of their thin oil zones, strong aquifer support, and large gas caps, which often cause early gas breakthrough and unstable production. Addressing these challenges is vital for sustaining production in many mature fields worldwide. Water-alternating-gas (WAG) injection is widely recognized for improving sweep efficiency, controlling gas production, and maintaining reservoir pressure. In this study, a calibrated dynamic reservoir model of the Halewah Field in Yemen was developed to compare two water-supply strategies for WAG injection: reinjection of produced water and the use of an external water source. The results showed that relying solely on produced water is insufficient for long-term pressure support, whereas WAG with external water supply increased the oil recovery factor from 23.7% to 30.4% and reduced the gas–oil ratio by about 38%. These findings demonstrate that ensuring a reliable water source is critical for the success of WAG operations in oil-rim reservoirs. Unlike previous studies that mainly focused on WAG cycle design or gas management, this work highlights the strategic role of water sustainability in enabling WAG effectiveness, thereby offering new insights for optimizing recovery in fields with similar geological and operational constraints. Unlike conventional WAG studies focusing on cycle optimization, this work establishes water sourcing as the fundamental strategic variable, providing a new decision-making framework for oil rim development.