纯化油田回注污水改性处理可行性研究

FEASIBILITY STUDY ON MODIFICATION OF BACKFILLING WASTE WATER IN CHUNHUA OILFIELD

纯化油田是典型的多层系、薄互层、中低渗透油田,油田开发方式主要以注水开发为主。自1992年回注污水以来,由于水质不合格,给油田开发带来了较大的危害。针对此种情况,在室内开展了改性水处理研究,主要从改性处理水处理工艺、改性水与地层水配伍性、不同含油量的改性水对地层损害程度及不同粒径中值、不同细菌含量、不同pH值的改性污水水质对地层伤害等几个方面进行了试验研究,试验结果表明,纯化油田回注污水进行改性处理是可行的,处理后的水对地层基本无伤害。

Water flooding is the dominating oilfield development method in Chunhua Oilfield, as it is a typical oilfield of medium to low permeability with multiple layers and thin inter-beds. Waste water has been used for backfilling since 1992 and this has caused severe damage to oilfield development due to the poor water quality. To solve this problem, water modification study was carried out in laboratory, and tests were conducted from such aspects as water modification technology, compatibility between modified water with formation water, damaging degree of modified water with different oil content on formation, and formation damages caused by modified water with different nominal granularities, different bacteria content and pH values. Results showed that modified waste water can be used for backfilling and it causes little damage to the formation.