砾岩油藏水气交替辅助CO2驱油特征
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1.中国石油新疆油田分公司实验检测研究院;2.西南石油大学石油与天然气工程学院

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TE348 DOI

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国家自然科学面上基金“低渗油藏泡沫与原位乳化协同改善CO2波及效率机理研究”(52474049)


Performance of Water-Alternating-Gas Assisted CO2 Flooding in Conglomerate Reservoirs.
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    摘要:

    新疆油田百21井区砾岩油藏低渗层段剩余油富集,CO2驱具有良好应用前景。然而,储层非均质性叠加油气流度差异导致CO2驱过程中极易发生气窜。水气交替作为矿场常用气窜控制手段,其对该区CO2驱的改善效果亟待研究。因此,本文借助不同渗透率天然砾岩岩心,探究百21井区非均质条件下,水气交替对CO2驱油特征和采收率的影响规律。结果表明,水气交替可有效抑制层内气窜,但水相存在会削弱CO2与原油相互作用,令产出油中低碳数组分减少。当层间与层内非均质性共存时,水气交替的控窜增油效果较差,需借助就地泡沫等更强流度控制技术辅助CO2驱油。本文的研究可为百21井区明确水气交替可行性提供支撑,为类似非均质油藏优选CO2驱控窜方式提供借鉴。

    Abstract:

    Oilfield are rich in remaining oil, positioning CO2 flooding as a promising enhanced oil recovery (EOR) technique. However, the inherent reservoir heterogeneity, coupled with the differing mobilities of oil and gas, poses a substantial risk of gas channeling during CO2 injection. Water-alternating-gas (WAG) injection, a widely recognized method for mitigating gas channeling, requires further investigation to assess its effectiveness in this region. This study employs natural conglomerate cores with varying permeabilities to evaluate the impact of WAG on the performance and oil recovery of CO2 flooding under heterogeneous conditions. The results indicate that WAG significantly reduces intra-layer gas channeling, but the aqueous phase dampens the interaction between CO2 and crude oil, leading to a reduction in low-carbon components in the produced oil. Furthermore, when inter-layer and intra-layer heterogeneities coexist, the effectiveness of WAG in controlling channeling and enhancing oil recovery diminishes, highlighting the need for additional mobility control techniques, such as in-situ foam. This research offers valuable insights into the feasibility of WAG in the Bai 21 well block and provides practical guidance for optimizing gas channeling control strategies in similar heterogeneous reservoirs.

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  • 收稿日期: 2024-10-08
  • 最后修改日期: 2024-10-10
  • 录用日期: 2024-12-03
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