水平井CO2缝间驱替产能影响因素

doi:10.7657/XJPG20220415

摘要/Abstract

摘要：

致密油藏衰竭式开发产量递减快,能量亏损严重。为探索更有效的开发方式,采用CMG-GEM软件建立水平井CO₂缝间驱替模型,模拟CO₂注入量、注入压力、储集层温度、裂缝间距以及裂缝长度对水平井产能的影响。结果表明：水平井CO₂缝间驱替能够较大程度地增加CO₂波及面积,充分挖掘剩余油,提高开发效果;注入压力为25 MPa时,CO₂注入量应接近且不超过10×10⁴ m³;日产量峰值随注入压力、裂缝间距和裂缝半长的增大而增大;储集层温度为80 ℃时,日产量峰值相对于其他温度较高,储集层温度越高,日产量达到峰值所需的时间越短。

关键词: 水平井, CO₂, 缝间驱替, 致密油藏, 产能, 裂缝, 注入量, 注入压力

Abstract:

When tight oil reservoirs are developed by depletion mode, oil production declines rapidly. In order to explore a more effective development technique, a CO₂ inter-fracture flooding model for horizontal well was established using the CMG-GEM software to simulate how the factors such as CO₂ injection volume, injection pressure, reservoir temperature, fracture spacing and fracture length affect horizontal well productivity. The results show that CO₂ inter-fracture flooding in a horizontal well can greatly increase the CO₂ swept area, fully exploit the remaining oil, and improve the development effect. When the injection pressure is 25 MPa, the CO₂ injection volume is close to and not more than 10×10⁴ m³. The peak production rate rises with the increase of injection pressure, fracture spacing and fracture half-length. The peak production rate at the reservoir temperature of 80°C is higher than that at other temperatures; however, the higher the reservoir temperature, the less time will be needed to reach the peak daily production rate.

Key words: horizontal well, CO₂, inter-fracture displacement, tight reservoir, productivity, fracture, injection volume, injection pressure

中图分类号:

TE357

萧汉敏, 罗永成, 赵新礼, 张海琴, 刘学伟. 水平井CO₂缝间驱替产能影响因素[J]. 新疆石油地质, 2022, 43(4): 479-483.

XIAO Hanmin, LUO Yongcheng, ZHAO Xinli, ZHANG Haiqin, LIU Xuewei. Factors Influencing Productivity of Horizontal Wells With CO₂ Inter-Fracture Flooding[J]. Xinjiang Petroleum Geology, 2022, 43(4): 479-483.

图/表 6

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水平井CO₂缝间驱替产能影响因素

Factors Influencing Productivity of Horizontal Wells With CO₂ Inter-Fracture Flooding

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