NTCP泡沫体系的注入方式及驱油效率

INJECTION PATTERN AND DISPLACMENT EFFICIENCY OF NTCP FOAM SYSTEM

对已优选NTCP泡沫体系的注入方式及驱油效果进行了研究 ,该体系由 0 .2 %NAPS疏水聚合物为稳泡剂 ,由起泡剂和工业氮气以一定比例组成的 0 .1 5 %复合表面活性剂SDS。泡沫有高的阻力系数和低的残余阻力系数。在模拟中原油田三厂所辖的文明寨油田地质条件下 ,泡沫有很高的驱油效率和调剖能力 ,对低渗透岩心的伤害程度极小。在单管岩心实验中注入 0 .8PV ,泡沫驱油效率比水驱提高 1 7.9%～ 2 8.7%。通过并联岩心实验得出 ,注入 0 .8PV ,这种泡沫体系在渗透率极差分别为 1 4 .1和 38.2的非均质油层的深部调剖 ,分别提高采收率 44 .0 %和 2 8.6 %。

Injection pattern and displacement efficiency of NTCP foam system have been studied, which is made of 0.2%NAPS hydrophobic associating polymer as foam stabilizer, 0.15% surfactant as foaming agent and industrial nitrogen in accordance with certain proportion. The NTCP foam system has high resistance coefficient and low residual resistance coefficient. Under the geological condition of Wenmingzai oilfield in Zhongyuan oilfields, simulation experiment shows that the foam system has high displacement efficiency, ability of control profile and low damages to low permeable formation. Injecting 0.8 PV in single core experiment, the displacement efficiency of foam flooding is 17.9%-28.7% higher than that of water flooding. Injecting 0.8 PV in parallel core experiment, when permeability contrast is 14.1 and 38.2 respectively, the displacement efficiency of foam flooding is 44.0% and 28.6% respectively higher than that of water flooding.