Study on improving the sweep efficiency of CO<sub>2</sub> flooding in low permeability fractured reservoirs in Huang-3 block

Tang Yong; Liao Songlin; Lei Xinhui; Yu Guangming; Kang Xingmei

doi:10.13809/j.cnki.cn32-1825/te.2019.03.002

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Study on improving the sweep efficiency of CO₂ flooding in low permeability fractured reservoirs in Huang-3 block
Vol. 9, Issue 3, Pages: 9-13(2019)
Published：2019
DOI： 10.13809/j.cnki.cn32-1825/te.2019.03.002
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DOI：

Tang Yong, Liao Songlin, Lei Xinhui, et al. Study on improving the sweep efficiency of CO₂ flooding in low permeability fractured reservoirs in Huang-3 block[J]. Petroleum Reservoir Evaluation and Development, 2019, 9(3): 9-13. DOI： 10.13809/j.cnki.cn32-1825/te.2019.03.002.

摘要

黄3区低渗裂缝性油藏开展注CO

驱先导实验整体增油降水效果明显

但部分井见气

气窜现象严重

降低了CO

驱增油效果。为了提高低渗裂缝性油藏CO

驱波及效率

采用示踪剂监测结合生产动态分析及数值模拟生产历史拟合的方式识别了储层优势渗流通道。在此基础上获取考虑优势通道的井组数值模拟模型

通过组分油藏数值模拟技术研究优势通道对CO

驱替效果的影响

并模拟对比了4种改善波及对策提高驱油效率的措施。结果显示

优势通道使CO

驱原油采收率下降7 %。采用高强度封堵措施封堵优势通道效果最好

RF提高了1.8 %;优势通道井气窜早期关井效果较好;注水保持地层压力时其次;生产井GOR达到2 000 m

时关井相对较差

RF仅提高0.11 %。研究成果对于低渗裂缝性油藏注气驱方案设计具有指导意义。

Abstract

A CO

flooding pilot test was carried out on the low permeability fractured reservoirs in Huang-3 block. The research results indicated that there were obvious oil-increasing effects in the overall area

but the gas channeling phenomenon was serious in some wells

resulting in a poor effect of CO

flooding. In order to improve the CO

flooding efficiency of low permeability fractured reservoirs

the dominant flow channels were identified by tracer monitoring combined with production dynamic analysis and numerical simulation of production history fitting. On this basis

a numerical simulation model of the well group considering the dominant channels was obtained. The effects of the dominant channels on the CO

displacement were studied by the numerical simulation technology of the component reservoirs

and four measures to improve the oil displacement efficiency were simulated. The results showed that the dominant channels reduced the CO

flooding oil recovery by 7 %. The best effect was obtained by blocking the dominant channels with high-intensity plugging measures

and the RF had increased by 1.8 %. The second best effect was when the dominant channels wells were shut down in the early stage of the gas channeling. Then followed when the water injection maintained the formation pressure. Shut in of the well was relatively poor when the GOR of production well reached 2 000 m

and the RF only increased by 0.11 %. The research results have guiding significance for the design of gas injection drive scheme for low permeability fractured reservoirs.