玉门H低渗透裂缝油藏强化泡沫防气窜实验研究

玉门油田贫氧空气驱油先导试验中3口采油井过早发生明显的气窜，使产液量与产油量大幅下降，影响正常生产。采用Waring Blender方法测定了矿化度8.3×10⁴ mg/L、温度114℃条件下的不同配方体系的泡沫性能，确定了较优的0.2% WP4+0.3% NS强化泡沫体系配方，通过岩芯驱替实验研究了该体系的高温高压稳定性、低渗透裂缝岩芯封堵性及气驱后贫氧空气泡沫调驱提高采收率的效果。实验结果表明，强化泡沫在高压条件下稳定性明显提高；能够增加流体在基质及裂缝中流动时的阻力，具有流度控制能力，阻力因子分布在5.09~38.66；对于贫氧空气驱后采用强化泡沫调驱的岩芯，提高采收率可达16.70%~38.11%。

An Experimental Study on Enhanced Foam Anti-gas Channeling in the Yumen H Low Permeability Fractured Reservoir

In a pilot test of the oxygen-poor air drive in the Yumen Oilfield, the three production wells had premature gas channeling, which caused a substantial drop in the liquid and oil production and affected normal production. The foam properties of different formulations with a salinity of 8.3×10⁴ mg/L and a temperature of 114℃, were determined with the Waring Blender method. The optimal formulation was determined:0.2%WP4 + 0.3% NS enhanced foam system. The stability at high-temperature and high-pressure, the plugging of low permeability cracks, and the EOR effect of oxygen-poor air foam injection after gas drive studied. The results show that the stability of the enhanced foam is improved under high-pressure. It can also increase the resistance of the fluid flowing in the matrix and the cracks and can control the fluidity. The resistance factor is between 5.09~38.66. Enhanced foam profile control and displacement after oxygen-poor air drive can increase the recovery efficiency of core by 16.70%~38.11%.