压降漏斗法封堵大孔道技术研究及应用

百色油田注水开发中由于强采强注和压裂等措施导致了大孔道的产生，加剧了油层非均质性，使注入水沿大孔道向油井窜进严重，造成大部分注水井无效注水，水驱波及系数降低。为有效堵住大孔道，提高水驱效率，立足于地层大孔道中注入水平面径向流形成压降漏斗的原理，开展了大孔道高渗透地层封堵技术方法研究，从而确定了压降漏斗法封堵大孔道技术，改善了注水状况，取得了较好的降水增油效果。

Research and Application of Pressure Drop Funnel Technique for Large Pore Passage Plugging

During the waterflood development of Baise Oil Field,the adoption of fracturing and forced recovery and injection bring about large pore passages and aggravate the heterogeneity of oil reservoirs. The injected water flow along the large pore passages into oil wells, therefore, the water injection of many wells are unfruitfulness and the water-driving sweep efficiency are low. In order to effectively plug large pore passages,the plugging technique of high permeability zone with large pore passage was researched on the basis of plane radial flow principle of injecting water in strata with large pore passage. In practice,this technique,been called as Pressure Drop Funnel Plugging Large Pore Passage,can easily solve the technique problem of severe water breakthrough in oil reservoirs and improve injection condition,the production rate was increased.