摘要
塔里木某油田注水开发区块在开采过程中由于储层非均质性强、注水水质矿化度高、水质不稳定,以及沿线注水二次污染等多方面的原因,许多井组出现地层污染和堵塞,造成注水压力增高甚至注不进水,严重影响注水开发效果。为确保注好水、注够水,对注水中的悬浮沉淀物进行了化学分析,沉淀物中主要包括Fe_3O_4和Fe_2O_3的混合物。为此,开展污水沉淀原理探讨,发现溶解氧超标,水中溶解的铁离子与氧发生沉淀反应,造成水质极不稳定;并开展注水处理工艺评价,找出注水处理工艺中存在的缺陷,及时开展阶段性的工艺及管理优化,使水质站内外输达标率从94.27%提高至96.88%,井口水质达标率从62.48%提高至98.92%。
Many well formations of the water injection development block of one oil field in Tarim have been polluted and blocked during exploitation because of strong reservoir heterogeneity, high sa-linity of injected water, unstable water quality and secondary pollution of injected water along the line. That has resulted in increased water injection pressure or even failure in water injection,thus greatly influencing the development effect of water injection development. In order to ensure the quality and amount of water injection, in-depth basic research is conducted. Through the chemical analysis of suspended sediment in water injection, the sediment mainly includes the compound of Fe3O4 and Fe3O3. Therefore, the principle of sewage sedimentation is discussed. It is found that dissolved oxygen exceeds the standard, and the iron ion dissolved in water has sedimentation reaction with oxygen and then makes water quality extremely unstable. The evaluation of water injection treatment process is conduct-ed, the defects of the water injection treatment process are found, and process and management optimization of stages are carried out. The field application has achieved good results. The rate of delivery of water quality stations inside reaches 96.88% from 94.27%, and the wellhead water quality compliance rate reaches 98.92% from 62.48%.
作者
陈国泉
CHEN Guoquan(Liaohe Oilfield Branch Company,CNPC)
出处
《油气田地面工程》
2019年第4期63-67,共5页
Oil-Gas Field Surface Engineering
关键词
注水
二次污染
水质
溶解氧
处理工艺
water injection
secondary pollution
water quality
dissolved oxygen
treatment process
