Analysis of Water Injection Capacity Reduction in Low Permeability Reservoirs and Measures for Solving It

Because permeability is low and pore throat is narrow in low permeability reservoirs,reinjected sewage quality can not meet the requirement of low permeability reservoir injection,which caused insufficient injection in water wells.The major causes of formation damage induced by sewage are determined by studying and the indexes for water injection in the block are established.By using various precision water quality treating devices and matched techniques for sewage treatment the quality of water can be improved and efficiency of low permeability reservoir production can be raised.