Regulation of Water Flooding Pressure System at Extra-high Water-cut Sage in Lamadian Oilfield

Keeping appropriate pressure is the base of enhancing oil recovery,and it is also very important to improve the utilization efficiency of water injection and control casing damage of the oil or water wells.The injection-production relationship in Lamadian Oilfield is complex,and some layer series of development are crossed.In recent years,reservoir pressure has been kept in a reasonable range as a whole,but there exists regional imbalance.So in order to direct pressure system regulations,the relationship of waterflooding reservoir pressure,flowing pressure and injection-production ratio and set technical limitation of the regulations are studied.After pressure system optimization and regulation in 2012,flooding pressure and every set of layer series are kept in a reasonable range and the ratio of the production wells raises to more than 45%.Casing damage is also controlled effectively.25 wells of casing damage are found in the whole production company,the casing damage rate is only 0.91%every 100 workover wells.