| 张庆福.页岩油藏注CO2增能开发数值模拟研究[J].计算力学学报,2024,41(4):755~761 |
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| 页岩油藏注CO2增能开发数值模拟研究 |
| Numerical simulation of CO2-EOR in shale oil reservoirs |
| 投稿时间：2023-01-15 修订日期：2023-04-02 |
| DOI：10.7511/jslx20230115001 |
| 中文关键词: 页岩油 注CO2 多尺度孔隙 裂缝 |
| 英文关键词:shale oil CO2 injection multi-scale pore fracture |
| 基金项目:中国石化油气开发基础前瞻课题(P21044-2);胜利油田项目(YKB2007)资助. |
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| 中文摘要: |
| 页岩油开发对胜利油田产能接替具有重要意义。页岩油藏渗透率低,难以注水补充能量,CO2易注入地层且能够改善原油流动条件,是页岩油增能开发的有效方法。但是页岩油藏包含微纳米级孔隙-微米级微裂缝-米级大裂缝多个尺度孔隙空间,且开发过程涉及组分相态变化,是一个多尺度多相多组分渗流的复杂过程。本文构建嵌入式离散裂缝模型表征裂缝系统,建立不同尺度孔隙间传导率将基岩系统与裂缝系统联系在一起,实现页岩油藏注CO2开发高效模拟。采用本模型研究了开发参数及裂缝参数等对开发效果的影响,结果表明,CO2吞吐能够有效补充地层能量,提高页岩油开发效果。页岩油注CO2吞吐时机不宜过早或者过晚,应充分利用地层能量,同时考虑及时注气补充能量。而且人工裂缝对开发效果影响明显,需要结合经济因素优化压裂参数。 |
| 英文摘要: |
| The development of shale oil is of great significance to Shengli Oilfield.It is difficult to apply water flooding in shale oil reservoir due to its low injectivity and poor sweep efficiency.Therefore,the decline of formation energy is a common challenge.Carbon dioxide (CO2) injection could be a feasible EOR method to improve the oil recovery and carbon sequestration in tight oil reservoirs.Therefore,it is necessary to study the factors affecting the productivity of shale reservoirs with CO2 injection.However,a shale oil reservoir contains multiple scale structures,such as micro-nano-scale pores,micro-fractures and mega-fractures,and it is a complex flow process of multiple scales,multiple phases and multiple components.In this work,the embedded discrete fracture model is applied to represent the fractures and the component model is used to describe the fluid flow.The influence development factors of shale reservoirs with CO2 injection are studied,which is of great significance for formulating development plans and guiding the efficient development of shale reservoirs. |
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