改性淀粉凝胶-泡沫复合调驱技术可行性及调剖体系定位位置优化

Feasibility of Modified Starch Gel-foam Composite Oil Displacement Technology and Position Optimization of Profile Control System

赵凤兰 吕春阳 侯吉瑞 苏伟 徐国瑞

ZHAO Fenglan Lü Chunyang HOU Jirui SUWei XU Guorui

针对我国海上油田渗透率高、储层非均质严重、长期注水开发无效等问题，通过物理模拟实验研究了改性淀粉凝胶-泡沫复合调驱技术的可行性，考察了复合调驱在非均质岩心中的驱油效果和淀粉段塞定位位置对复合调驱的影响。研究结果表明，复合调驱时淀粉胶优先封堵含油饱和度低的高渗透层，迫使后续泡沫体系进入含油饱和度高的中低渗透层，复合驱在水驱基础上提高采出程度24.63%，岩心出口端含水率从98%降至45.3%，驱油效果好于单独淀粉胶调剖或泡沫驱；高强度淀粉胶分段定位至岩心深部和前缘线位置时，可改善泡沫窜流问题，提高泡沫的波及体积，有效启动低渗透层中的剩余油，注泡沫阶段采出程度可提高28.97%，最终采收率可达63.11%。图9 表3 参14

The offshore oilfield in China always had the problem of high permeability，strong heterogeneity，inefficient water flooding et al. To improve this situation，modified starch gel and foam composite oil displacement technology was studied by physical simulation experiment. The flooding effect of the combination system in heterogeneous cores and the effect of different gel location on the combination flooding consequence were investigated. The results showed that modified starch gel prefered to enter high permeable zone which oil saturation was low，compelled foam into the middle and low permeable zone which oil saturation was high. In that case，the recovery degree of this combination flooding could be 24.63% higher than that of first water flooding，the moisture content of core outlet port reduced from 98% to 45.3%. The oil displacement effect of combination system was better than that of starch gel or foam alone. When starch gel located in deep core and trimline，foam channeling problem could be solved，and the sweeping volume of foam flooding could be enlarged，the residual oil in low permeability layer could be displaced. The recovery ratio increased 28.97% in foam flooding stage，the ultimate recovery ratio could reach 63.11%.

10.19346/j.cnki.1000-4092.2016.03.010