Research on formation damage by produced-water reinjection in Boxi oilfield and chemical protection measures

Laboratory experiment has been made for the reinjection of produced-water in Boxi oilfield based on reservoir characteristic analysis and produced water quality evaluation.According to softw are predict ion and static and dynamic scaling test on mixture of produced-water and formation water, compatibility of produced-water and formation water was studied, and the results show ed scaling occurred in both of them. Core flow test was conducted by simulating reservoir condition, the permeability of formation decreased after the reinjection of produced-water.The main causes are water sensitivity and solid plugging.The chemical method has been studied to protect from formation damage and clay stabilizer and scale inhibitor have been chose by lab test.