Technology of water injection for beach-bar sand reservoirs with low permeability in Block Fan 151

Block Fan 151 is a beach-bar sand reservoir with low permeability.The overall physical property of reservoir is poor.The injection pressure becomes higher and higher during the process of water injection.Aiming at this problem,the sensibility,wettability and water compatibility of reservoir were evaluated in laboratory.The reason of poor water absorbing capacity of injection well was analyzed systematically in this paper.The converted process and water injection system were optimized and the field test was done with a good result.The stable water injection of Block Fan 151 was achieved and the producing rate of reserves and ultimate recovery were improved.