Research on activity of water increase injection technique in low permeability

Low permeability reservoirs is becoming more and more important in the oil field development, reservoir properties and the way of development impact water process lead to high pressure in water injection and pressure conduction slow, well productivity quick decrease and other contradictions during development process. At present, we applied increasing water injection with acid, but there is a short period of validity and casing damage etc. To above-mentioned problem, we carried on the indoor study on compound activity system, which reduce the injection pressure, expand the sweep efficiency and improve low-permeability reservoir recovery. On-site pilot shows that the activity of water can increase oil production and reduce injection pressure.