Well Nets Adjustment Research On Fractural Low Permeability Reservoirs In Block S

In this paper, We describe crack evaluate water injection effect and analysis the well netsadaptability based on the wide research of the comprehensive and multidisciplinary analysisof geological features in S block. The results showed that fissure develop relatively,absorbent is disproportion vertically of injection wells,water displacement and degree ofreserve recovery and oil production are low, escalating rate of containing water is high, theunderground water is lower than theory value, injection flow rate is short.,so the effect ofwater flooding was poor.Using Petre software and Eclips software establised geologic model and proceed historymatching refer to actual datum of activity. The results showed that geologic reserve ofcaculation is718.33×104t but the real geologic reserve is717.47×104t, the fractional error is0.12%, the total crude output of caculation is52.59×104t, the real date of development is54.12×104t, the fractional error is2.82%, composite water cut of caculation is54.27％, thereal composite water cut of caculation is52.94％, the fractional error is2.51%. The results arethat a great quantity of oil remaining still distribute under ground, the oil remaining mainledistribute in S1~S15and S19~S25of|1|1and|1|2and|1|3and|3on top of JF, the form of oilremaining on plane is the residual oil of imperfect injection formation, the residual oil of faultblock occlusion formation, the remaining area between wells the residual of losing control ofwell nets, the remaining area of sandstone of edge, the residual oil of invalid injection and soon.According to residual oil saturation distribution law of Liaohe oil field, respectively,considering the cycle water injection, added perforating, increasing injection, profile controland water shutoff, converted production, converted recover, well pattern thickening thesemeasues, nine programs were designed in testing well group optimization of S block. The result whichcalculated by simulating showed that the ninth program was optimal, its cumulative oil production is120.68×104t, the phase degree of recovery is16.82%, reacher1.97%than base program.