A Study of the Effect of Oilfield Water Quality on Reservoir Injury

Abstract

AbstractMost of the current oil fields are low-permeability fields with tiny pores and low permeability. The primary development method is water injection development. In water injection development, the water quality of oil field injection water plays an essential role in oil fields’ development effect. The content of suspended particles in oilfield injection water, excessive oil content, and sediment accumulation will harm the underground reservoir and lead to a continuous decrease in the reservoir’s permeability, which in turn will affect the development effect of the oilfield. The effect of injection water quality on the reservoir is studied using physical experimental simulations and core replacement experiments. The damage laws of suspended solids, sensitivity and water injection rate in the injected water to the reservoir were investigated. The damage to the reservoir caused by suspended particle content in the injection water, oil content, and injection rate was quantitatively characterized. The results show that the core permeability will keep decreasing, and the rate of damage to the reservoir will keep increasing with the increasing injection of water and the increasing content of suspended matter in the injection water. The medium and low permeability reservoirs’ damage is much more severe to the same extent of water injection volume than that of the high permeability reservoirs. The degree of damage to the reservoir from oil content in the injected water is much lower than the degree of damage to the reservoir from suspended material.KeywordsWater flooding developmentInjected water qualitySuspended solidOil contentDamage