砂岩油藏高含水期封堵大孔道工艺技术研究及应用

从文、马油田的地质特点、开发历程出发,分析了大孔道的形成因素。针对其渗透率高、孔喉半径大、油水井连通性好的特点,进行了室内堵剂种类、浓度的筛选及堵剂性能的评价,对原有调剖工艺进行了改进,并进行了现场试验,形成并逐步完善了封堵大孔道工艺技术。1997年以来运用该工艺封堵大孔道井25口,累计增油7303t,降水29922m3,投入产出比达1:3.7,有效地解决了封堵大孔道的难题。该工艺改善了层间矛盾,提高了水驱采收率,具有较大的推广应用价值。

RESEARCH AND APPLICATION OF TECHNIQUE FOR PLUGGING LARGE PORE PATH IN SANDSTONE RESERVOIR AT HIGH WATER CUT STAGE

Based on the investigation to the geologic features and development history of Wen and Ma Oil Fields, this paper analyzes the origin of large pore path. In view of the high permeability, large throat radius, good connection among injectors and producers and so on, this paper conducts screening to the sort and concentration of water shutoff agent and evaluation on its property. The original profile control process is improved. Field test is carried out. Technique for plugging large pore path is formed and completed gradually. Since 1997, the technique has been used to plug large pore path in 25 wells. The accumulated incremental oil production is 7303 t, the accumulated water production decreased by 29 922 m~3, and the input--output ratio is 1:3.7. The problem of plugging large pore path has been solved.