新沟嘴组油藏注入水伤害分析及对策研究

Analysis of and Solutions to Reservoir Damage by Waterflooding in Xingouzui Formation

新沟嘴组油藏为多种敏感性并存储层,普遍表现为中等偏强水敏、中等偏强酸敏。研究新沟嘴组注入水水质指标,从储层敏感性以及悬浮物、细菌和总铁含量等方面展开注入水对储层伤害的分析,并提出三项对策:控制注入水流速与矿化度;控制悬浮物含量及颗粒直径;采取有效杀菌技术特别是电解杀菌技术。

Oil reservoir of Xingouzui Formation features polysensitivity, generally showing medium--to--strong water sensitivity and acid sensitivity. On the basis of analysis of reservoir damage by waterflooding in terms of water quali- ty index, reservoir sensitivity, suspended solids, bacteria and total body iron, solutions are： controlling waterflood- ing flow velocity and salinity, controlling suspended solid content and particle diameter and adopting effective sterili- zation technology, especially electrochemical sterilization.