陆上油田聚驱后聚表剂驱渗流场变化规律研究

针对陆上油田的典型区块,设计了二维层间物理模型,运用自主研制的饱和度监测系统监测所采用的聚驱后聚表剂驱实验方案,开展了层间二维模型驱替波及动用监测实验,实时监测化学驱阶段含油饱和度分布,从而掌握陆上典型油田区块的波及动用规律。结果表明,在层间二维平板岩心的并联实验中,陆上典型区块聚驱后注入1.05PV华鼎Ⅰ聚表剂能提高采收率13.69%。饱和度监测数据表明,聚驱后化学驱阶段均不同程度的形成油墙,增大了渗流阻力,从而扩大了波及体积,提高了采收率,聚表剂驱阶段提高采收率的关键是有效的动用了中低渗层,华鼎I型聚表剂驱替之后岩心主流通道上形成一条很宽的低含油饱和度条带,其具有很强的驱油效率。

The Variation Laws of Seepage of Hydrophobic Associating Polymer Flooding after Polymer Flooding in Onshore Oilfields

In order to study the typical block of onshore oil fields, a two dimensional interlayer physical model is designed. The experiment scheme of hydrophobic associating polymer flooding after polymer flooding is monitored by self developed saturation monitoring system. The spread and use of typical onshore oil field blocks are grasped by carrying out the experiment about the displacement, the use and the monitor of the two dimensional interlayer physical model and monitoring and the oil saturation distribution in the chemical flooding stage in real time. The results indicated that: in two dimensional interlayer core parallel experiments, recovery efficiency of the land typical block could be improved by 13.69% through injecting 1.05 PV Huading I hydrophobic associating polymer after polymer flooding. Saturation monitoring data showed that chemical flooding stage after polymer flooding had formed oil wall inordinately, increased filtrational resistance, so as to enlarge the swept volume and improve recovery efficiency. The key to improve the oil recovery in polymer flooding was the efficient use of the low permeability layer. A wide low oil saturation line was formed in core mainstream channels with a strong oil displacement efficiency after Huading I hydrophobic associating polymer flooding.