自上世纪70年代以来,CO2驱提高采收率技术在油藏工程理念上已形成连续CO2注入、恒定比例C-WAG(Constant Water-Alternating-Gas)注入、梯度/混合-WAG注入(Tapered/Hybrid WAG Injection)以及SWG(Simultaneous Water and Gas)或SSWG(Simu...自上世纪70年代以来,CO2驱提高采收率技术在油藏工程理念上已形成连续CO2注入、恒定比例C-WAG(Constant Water-Alternating-Gas)注入、梯度/混合-WAG注入(Tapered/Hybrid WAG Injection)以及SWG(Simultaneous Water and Gas)或SSWG(Simultaneous Separated Water and Gas)注入等多种开发模式。CO2之所以成为极具活力的提高采收率注入气,得益于其所特有的超临界流体特征和显著的溶剂化能力。在对CO2主要的具有优势的驱油机理以及国内外典型CO2驱提高采收率油藏工程理念和开发模式分析基础上,结合国内外不同类型油气藏的开发特征,特别是水平井技术、低渗油气藏体积压裂技术的成功应用经验,以及与CCUS(Carbon Capture,Utilization and Storage)一体化的CO2 CCUS-EOR(Carbon Capture,Utilization and Storage-Enhanced Oil Recovery)的综合利用理念,进一步对国内CO2驱提高采收率油藏工程开发模式的发展提出建议,以期能为促进国内CO2驱提高采收率技术的规模化发展提供启示。展开更多
The idea that the collapse proceeds from the outer boundary of the cavity cloud towards its center for the ultrasonic cavitation proposed by Hasson and Morch in 1980s is further developed for calculating the collapse ...The idea that the collapse proceeds from the outer boundary of the cavity cloud towards its center for the ultrasonic cavitation proposed by Hasson and Morch in 1980s is further developed for calculating the collapse pressure and boundaries of cavity cloud at the collapse stage of bubbles for hydraulic cavitation flow in Venturi in present research. The numerical simulation is carried out based on Gilmore＇s eouations of bubble dynamics, which take account of the compressibility of fluid besides the viscosity and interfacial tension. The collapse of the cavity cloud is considered to proceed layer by layer from the outer cloud towards its inner part. The simulation results indicate that thepredicted boundaries of the cavity cloudat the collapse stage agree.well with the exPerimental ones.It is also found that the maximum collapse pressure of the cavity cloud is several times as high as the collapse pressure of outside boundary, and it is located at a point in the axis, where the cavity cloud disappears completely. This means that a cavity cloud has higher collapse pressure or strength than that of a single bubble due to the interactions of the bubbles. The effects of operation and structural parameters on the collapse pressure are also analyzed in detail.展开更多
文摘自上世纪70年代以来,CO2驱提高采收率技术在油藏工程理念上已形成连续CO2注入、恒定比例C-WAG(Constant Water-Alternating-Gas)注入、梯度/混合-WAG注入(Tapered/Hybrid WAG Injection)以及SWG(Simultaneous Water and Gas)或SSWG(Simultaneous Separated Water and Gas)注入等多种开发模式。CO2之所以成为极具活力的提高采收率注入气,得益于其所特有的超临界流体特征和显著的溶剂化能力。在对CO2主要的具有优势的驱油机理以及国内外典型CO2驱提高采收率油藏工程理念和开发模式分析基础上,结合国内外不同类型油气藏的开发特征,特别是水平井技术、低渗油气藏体积压裂技术的成功应用经验,以及与CCUS(Carbon Capture,Utilization and Storage)一体化的CO2 CCUS-EOR(Carbon Capture,Utilization and Storage-Enhanced Oil Recovery)的综合利用理念,进一步对国内CO2驱提高采收率油藏工程开发模式的发展提出建议,以期能为促进国内CO2驱提高采收率技术的规模化发展提供启示。
基金Supported by the National Natural Science Foundation of China （10472024）.
文摘The idea that the collapse proceeds from the outer boundary of the cavity cloud towards its center for the ultrasonic cavitation proposed by Hasson and Morch in 1980s is further developed for calculating the collapse pressure and boundaries of cavity cloud at the collapse stage of bubbles for hydraulic cavitation flow in Venturi in present research. The numerical simulation is carried out based on Gilmore＇s eouations of bubble dynamics, which take account of the compressibility of fluid besides the viscosity and interfacial tension. The collapse of the cavity cloud is considered to proceed layer by layer from the outer cloud towards its inner part. The simulation results indicate that thepredicted boundaries of the cavity cloudat the collapse stage agree.well with the exPerimental ones.It is also found that the maximum collapse pressure of the cavity cloud is several times as high as the collapse pressure of outside boundary, and it is located at a point in the axis, where the cavity cloud disappears completely. This means that a cavity cloud has higher collapse pressure or strength than that of a single bubble due to the interactions of the bubbles. The effects of operation and structural parameters on the collapse pressure are also analyzed in detail.
