胜一区聚合物驱油藏调剖技术矿场实践与认识

胜一区沙二段1～3单元是胜坨油田最早开展聚合物驱的高温高盐油藏，包括先导试验区及扩大试验区2部分。受平面渗透率变异系数大、层间渗透率级差大等因素的影响，在聚合物驱油前、聚合物驱油过程中和聚合物驱转后续水驱阶段均出现了窜聚或水窜现象。综合分析地层渗透率、吸水、吸聚剖面等资料，对堵剂适应性进行优选评价，实施调剖，充分发挥和利用地下聚合物段塞的驱油作用，提高了阶段采油速度。聚合物驱油前采取无机颗粒类堵剂和高强度凝胶类堵剂协调层间矛盾；聚合物驱油过程中采用调整聚合物质量浓度及添加有机交联剂协调平面矛盾，增大扫油面积；聚合物驱油后采用运移能力强的凝胶类堵剂深部调剖，封堵转水驱后形成的大孔道，进一步延长聚合物段塞驱油的有效期，提高最终采收率。

Field application and recognition of profile control technology of polymer flooding reservoir in Shengl area.

The 1 to 3 unit of Es_2 member in Shengl area is a high-tempera- ture and high-salinity reservoir including two parts of pilot test area and expanding test area,in which the polymer flooding was applied earliest in Shengtuo Oilfield.Affected by the high perme- ability variation coefficient and high interlayer permeability dif- ferential,polymer channeling and water channeling have been found at the stage of polymer pre-flooding,polymer flooding and the sequent water flooding.Based on comprehensive analyses ...