稠油油藏水平井多元热流体吞吐高效开采技术

水平井多元热流体吞吐高效开采技术是一项综合利用水平井、二氧化碳、氮气和蒸汽进行稠油开发的提高采收率新技术。根据稠油油藏的特点,对其进行了水平井多元热流体吞吐实验及数值模拟研究,揭示了其提高采收率机理。与常规蒸汽吞吐相比,水平井多元热流体吞吐高效开采技术具有3大优势:水平井可以提高注入能力与生产能力,且吞吐有效期长;二氧化碳能有效降低稠油粘度和残余油饱和度,提高驱油效率;氮气可以扩大注入蒸汽波及范围,降低注入蒸汽热损失。现场应用证实,该技术可有效提高蒸汽的利用效率,降低注入压力,提高油井产能,延长吞吐有效期,能够大幅度提高海上稠油产量。

Study on horizontal well multi-component thermal fluid stimulation high efficiency recovery technology for heavy oil reservoir

Horizontal well multi-component thermal fluid stimulation high efficiency recovery technology is an EOR technology for heavy oil reservoir, which utilizes horizontal well, CO2, N2 and steam. The EOR mechanism is studied through horizontal well multicomponent thermal fluid stimulation experiment and numerical simulation based on the heavy oil reservoir characterization. Compared with the conventional steam stimulation, the horizontal well multi-component thermal fluid stimulation high efficiency recovery technology has three advantages: horizontal well can improve the injectivity and productivity and has a longer-term validity, the CO2 can significantly decrease heavy oil viscosity and residual oil saturation, in addition, the CO2 can also improve the displacement efficiency; the N2 can enlarge the sweeping volume and decrease the heat loss. The field application confirmed that this technology can significantly improve the steam utilization, decrease the injection pressure, improve oil well productivity, extend period of validity, and greatly improve the heavy oil reservoir of offshore reservoir.