Comprehensive Management for Low-permeability Sandstone Oil Reservoir in Huoshaoshan Oilfield

摘要

HuoShaoShan Oil-Field has been developed since 1987 . It isrna fractured anticline sandstone oil pool with low-permeability.rnWith the serious water breakthrough and water encroachment,rnthe average decrease rate of productivity for early years was asrnhigh as 22.7%. In the third year for development, the water cutrnwas 52.2% and the recovery percent of reserves was belowrn5%.rnUp to now, so much testing has been performed, such asrnthree recovery techniques testing, testing of two wells forrnsealing core drilling, seven plugging agent testing, twornseparate injection pipe strings testing, three acidizationrnmethods testing, two leak protection pipe strings testing,rndownhole discharge dissolution test, high-engine-gas fracturerntesting, and test of compound perforation. At the same time,rn59 wells have newly been drilled. Besides, profile control hasrnbeen done in 37 wells, and the treatment of Fracturing,rnacidization, cement squeeze and water shut-off have beenrnperformed in 281 well times. After these treatment, by now,rnthe net increment of the oil in the field is 7.28 ×10 4 t and waterrncut in Huoshaoshan Oil-Field decreased from 55% to 40.3%rnand maintained at 53.4%. The degree of water-drive controlrnhas increased from 51.1% to 68.2%.rnAfter several years' comprehensive management, the poorrneffect has been improved, which achieved good economicrnbenefit.