交联聚合物封堵平面非均质油藏物理模拟

利用平面非均质填砂模型进行了有机交联聚合物封堵的油藏物理模拟实验,对比研究了水驱、聚合物驱和交联聚合物封堵对开采效果的影响.通过布置49个高精度的压差传感器测量交联聚合物封堵过程中油藏压力场的动态变化,用数码相机照相定性地观察了油藏流体变化情况.实验中发现,交联聚合物封堵最终采收率比水驱提高33%,比聚合物驱提高14%.交联聚合物能有效地封堵高渗条区,形成"段塞",改变了油藏内流体流动方向,扩大了波及范围,驱替出低渗区的油,提高了采收率.

EXPERIMENTAL INVESTIGATION OF CROSSLINK POLYMER PLUGGING IN HORIZONTAL HETERO-GENEOUS RESERVOIR

Experimental investigation on crosslink polymer plugging was conducted with a sand packing model for horizontal heterogeneous reservoir.The effects of water flooding,polymer flooding and crosslink polymer plugging on enhanced oil recovery (EOR) are analyzed.Fourty nine differential pressure transducers with high accuracy were installed in the simulation model to measure the pressure field variation in reservoir during the experiments.The fluid flow variation in the reservoir was observed qualitatively with a digit camera after each experiment.In present tests,the oil recovery of crosslink polymer plugging is more than water flooding by 33%,and is more than polymer flooding by 14%.The pressure variation and test pictures clearly show that crosslink polymer plugged the central region with high permeability in the model improved the horizontal heterogeneity and expanded sweep region.The crosslink polymer plugging changed the fluid flow direction in reservoir and displaced oil from lateral regions with low permeability,which enhanced the oil recovery of reservoir.