随机分形体积压裂水平井CO2吞吐模拟

doi:10.12108/yxyqc.20200118

岩性油气藏 ›› 2020, Vol. 32 ›› Issue (1): 161–168.doi: 10.12108/yxyqc.20200118

• 石油工程 • 上一篇

随机分形体积压裂水平井CO₂吞吐模拟

周瑞¹, 苏玉亮¹, 马兵², 张琪³, 王文东¹

1. 中国石油大学(华东)石油工程学院, 山东青岛 266580;
2. 中国石油长庆油田分公司油气工艺研究院, 西安 710018;
3. 中国地质大学(武汉)资源学院, 武汉 430074

收稿日期:2019-05-07 修回日期:2019-08-27 出版日期:2020-01-21 发布日期:2019-11-22
第一作者:周瑞(1996-),男,中国石油大学(华东)在读硕士研究生,研究方向为非常规油气渗流与开发、复杂缝网数值模拟表征方法等。地址:(266580)山东省青岛市黄岛区长江西路66号中国石油大学(华东)石油工程学院。Email:S17020236@upc.edu.cn。
基金资助:
国家自然科学基金项目“页岩油多尺度运移机制及数值模拟”（编号：51674279）、“页岩油微观运移机理与可流动性评价”（编号：51804328）和山东省自然科学基金项目“强非均质页岩多孔介质尺度升级方法研究”（编号：ZR2019PEE039）联合资助

CO₂ huff and puff simulation in horizontal well with random fractal volume fracturing

ZHOU Rui¹, SU Yuliang¹, MA Bing², ZHANG Qi³, WANG Wendong¹

1. School of Petroleum Engineering, China University of Petroleum(East China), Qingdao 266580, Shandong, China;
2. Research Institute of Oil and Gas Technology, PetroChina Changqing Oilfield Company, Xi'an 710018, China;
3. School of Earth Resources, China University of Geosciences(Wuhan), Wuhan 430074, China

Received:2019-05-07 Revised:2019-08-27 Online:2020-01-21 Published:2019-11-22

摘要/Abstract

摘要： 目前，非常规储层开采以水平井分段压裂技术为主，而体积压裂会在地下产生诱导裂缝并沟通天然裂缝形成复杂裂缝网络。为了更好地模拟页岩气在地下缝网中的流动情况，以组分模拟器为平台，基于双孔介质模型，结合随机分形几何系统，将复杂裂缝网络与页岩气数值模型耦合，来建立随机分形裂缝网络模型，并基于该模型进一步研究CO₂吞吐开采页岩气的5个方案。结果表明：CO₂吞吐能够显著提高页岩气的产量，注入压力和注入时间的增加均能提高最终采收率，后者在吞吐开采页岩气的过程中存在最优值，而注入时机过早或过晚都会使生产效果变差，在每个CO₂吞吐周期中存在一个最佳注入时机范围。分形裂缝网络模型为深入开展裂缝CO₂吞吐开采页岩气藏的模拟研究提供了一定的理论基础。

关键词: 页岩气, 体积压裂, 分形几何, CO₂吞吐, 数值模拟

Abstract: At present,the horizontal drilling with large-scale hydraulic fracturing is the main technology to mine shale gas while volumetric fracturing would induce cracks underground and communicate natural cracks to form complex fracture networks eventually. In order to simulate the seepage flow of shale gas in the complex fracture network and characterize the network on the shale gas model,a random fractal network model was established through a two-porosity component simulator combined with the random fractal geometry system. Based on the above model,five schemes for carbon dioxide stimulation to extract shale gas were further studied. The results show that CO₂ huff and puff can significantly increase the production of shale gas,and the increase of injection pressure and injection time can improve the ultimate recovery. The latter has the optimal value in the process of shale gas production,and too early or too late injection timing will make the production worse,and there is an optimal injection timing range in each CO₂ injection cycle. The fractal fracture network model provides a theoretical basis for further research on the simulation of fracture CO₂ huff and puff production of shale gas reservoir.

Key words: shale gas, volumetric fracturing, fractal geometry, CO₂ huff and puff, numerical simulation

中图分类号:

TE357

周瑞, 苏玉亮, 马兵, 张琪, 王文东. 随机分形体积压裂水平井CO₂吞吐模拟[J]. 岩性油气藏, 2020, 32(1): 161–168.

ZHOU Rui, SU Yuliang, MA Bing, ZHANG Qi, WANG Wendong. CO₂ huff and puff simulation in horizontal well with random fractal volume fracturing[J]. Lithologic Reservoirs, 2020, 32(1): 161–168.

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随机分形体积压裂水平井CO₂吞吐模拟

CO₂ huff and puff simulation in horizontal well with random fractal volume fracturing

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