火驱作为接替蒸汽吞吐提高采收率的主要开采方式之一，在开发稠油时存在波及效率低、见效时间晚等问题。针对稠油油藏的特点，提出了一种脉冲注气的火驱方式，该方式通过调整注气井的工作制度，以改善火驱的燃烧波及效果。在新疆红浅1稠油油藏地质特征基础上，利用数值模拟揭示了脉冲注气的可行性和作用机理，研究了地质因素和工程因素对脉冲注气开发效果的影响，最后应用于火驱矿场。结果表明：脉冲注气通过脉冲的峰值与谷值对燃烧前缘进行调控，加速了燃烧前缘的均匀推进，从而提高了驱油效率。脉冲注气可使见效时间提前600 d左右，燃烧波及增加30%以上。脉冲注气适用于储层纵向渗透率级差小于15、原油黏度为2 000 ~ 10 000 mPa·s的中等非均质储层，最佳的脉冲振幅为1.5 ~ 2、步长为30 d。将研究成果应用于新疆红浅1火驱工业区后，井组日产油增加0.5 ~ 2.8 t，空气油比降低34%，取得了较好的增产效果。

Fire flooding is a primary method used to enhance heavy oil recovery, often replacing steam stimulation. However, it encounters challenges such as low sweep efficiency and delayed effective times in heavy oil development. A new fire flooding PGI(pulse gas injection) technology was used to solve these problems. The combustion sweep effect of fire flooding can be improved by adjusting the working system of the gas injector. Based on the geological characteristics of the Hongqian 1 heavy oil reservoir in Xinjiang, the feasibility and mechanism of PGI were elucidated through numerical simulations. The influence of geological and engineering factors was studied on the development effect of PGI, and the consequences are applied to the fire flooding field. The combustion front can be controlled by the peak-valley value stage of PGI, accelerating the uniform movement of the combustion front and improving the oil displacement efficiency. Specifically, PGI can reduce the effective time by approximately 600 days and increase combustion sweep by more than 30%. This technique is particularly suitable for medium heterogeneous reservoirs with a vertical permeability contrast of less than 15 and crude oil viscosities ranging from 2 000 to 10 000 mPa·s. The optimal pulse amplitude ranges between 1.5 and 2, with a recommended step length of 30 days. When applied to the Hongqian 1 fire flooding industrial area in Xinjiang, daily oil production increased by 0.5 to 2.8 t for the well group, and the air-oil ratio decreased by 34%. PGI can achieve a better production increase effect for field production.