Ignition design of air injection wells is the crucial factor to a successful in-situ combustion. In this paper, experimental studies were carried out on post steam flooding wells at JIN-91 of Liaohe oilfield for improving ignition success rate. The experiments were conducted by a high temperature-pressure ignition device specifically designed for in-situ combustion, and the effects of various parameters were investigated by factorial experiments. The results showed that the ignition temperature was reduced and the ignition time was shortened due to three factors: heating temperature, reservoir pressure, and clay minerals. When heating temperature exceeded 360 °C, experimental pressure was higher than 4.0 MPa, and 10% of montmorillonite clay was added, the crude oil samples could be ignited rapidly. According to the factorial results, the most effective method to shorten ignition time is by increasing heating temperature, the safest method to reduce crude oil spontaneous combustion temperature and to shorten ignition time is by applying clay minerals, and reservoir pressure is the key factor for safety operation during ignition operation. These results will provide experimental theoretical guidance for high efficiency ignition, process optimization, and safe implementation of crude oil reservoir, they also will deliver tech support for the high efficiency operation of in-situ combustion.

注气井的点火设计是原位燃烧成功的关键因素。本文针对辽河油田金91后蒸汽驱井进行了提高点火成功率的试验研究。实验采用专为原位燃烧设计的高温高压点火装置进行，并通过因子实验研究了各种参数的影响。结果表明，受热温度、储层压力和粘土矿物三个因素影响，着火温度降低，着火时间缩短。当加热温度超过 360 ℃，实验压力高于 4.0 MPa，加入 10% 的蒙脱土，原油样品可以快速点燃。根据阶乘结果，缩短点火时间最有效的方法是提高加热温度，降低原油自燃温度和缩短点火时间最安全的方法是应用粘土矿物，而油藏压力是点火操作过程中安全操作的关键因素。这些成果将为原油高效点火、工艺优化和安全实施提供实验理论指导，也将为原位燃烧高效运行提供技术支持。