聚合物驱后双液法固定技术试验研究

EXPERIMENTAL RESEARCH ON POLYMER-FIXED TECHNOLOGY OF DOUBLE-FLUID METHOD AFTER POLYMER FLOODING

聚合物驱后恢复水驱 ,由于不合理的流度比造成后续注入水迅速沿高渗透层突破进入油井 ,使油井很快水淹。针对这一情况 ,通过平板模型驱油试验 ,研究了聚合物驱后双液法固定技术。研究得出 :聚合物驱后采用双液法注入固定剂溶液 ,可以充分固定地下高浓度聚合物溶液 ,形成的冻胶体系可以有效封堵这部分高渗透孔道 ,迫使后续注入水进入中、低渗透层 ,提高了聚合物驱后的原油采收率 ;聚合物驱后若恢复水驱 ,通过絮凝和双液法固定技术 ,可以充分絮凝低浓度聚合物溶液 ,并有效固定高浓度聚合物溶液 ,该技术对于高渗透层的封堵十分有效 ,使注水剖面得到较大程度的改善 ,提高了后续水驱的波及系数 ,从而提高了水驱的原油采收率。

To the condition of water flooding after polymer flooding, due to improper mobility ratio, following water will quickly breakthrough the bank of polymer to production wells, which cause water cut in production wells in a short time. To solve this problem, polymer-fixed technology of double-fluid method has been put forward in this paper. Results show that application of the technology after polymer flooding could fully fix high concentration polymer in site and the formed gel system will effectively plug these high permeability channels, impel following water to strata of medium and low permeability and improve the oil recovery after polymer flooding. To restoring water flooding after polymer flooding, the technology of flocculating and polymer-fixed technology of double-fluid method can fully flocculate low concentration polymer and effectively fix high concentration polymer in site, which can plug effectively high permeability strata, improve greatly the water injection profile, the sweep efficiency of succeeding water flooding and the oil recovery of water flooding.