Evaluation Of Exploitation Results About Gaotaizi Oil Zones In The Sazhong Development Area

The development about Gaotaizi oil zones has been into super high water-cut period in the Sazhong Development area. The speed of water-cut rise and production decline is getting quicker and quicker, and the difficuty to control casing damage is getting lager and larger. For controlling water-cut rise and production decline, and recovery enhancing of oilfield, a comprehensive evaluation to be carried through is quite necessary. Though development indexex such as production decline rate , water-cut rise , recovery degree ,formation pressure and so on being synthetically evaluated , by using three methods about production decline regulation, relations between integrated water-cut and recovery degree, and changes of fluid and oil productivity index, ultimate recovery efficiencies of Gaotaizi oil zones for ten development blocks were anticipated respectively and exploitation results about Gaotaizi oil zones in the Sazhong development area were analyzed quantificationally in this paper. The reasonable well spacing density and injection-to-producing-well ratio were determined according to the comparation with theoretical computation and actual development result.Through studying styles, water out behaviors ,and remaining oil distribution law of oil layers with sealing core drill data, investigating employment state with injection profile data, the adaptability of injection-to-producing system about Gaotaizi oil layers was deeply analyzed , the reasonable evaluation parameters were established and the limit standards were given, the adjustment potential of injection-to-producing system was defined.under the premise of adaptability of injection-to-producing system and exploitation result being appraised,two typical develpment blocks was adjusted respectively and successfully. The fact proves that injection-to-producing adjustment is much more available to rising reservoir pressure, decreasing production decline, and controlling casing damage,the shallow adjustment-profile technology has a better effect in improving exploitation results about Gaotaizi oil zones, periodical injection-water can adjust newly pressure field , enlarge waterflood swept area and improve oil-layer heterogeneity.The credible theory and practical basis was presented for the job of controlling water-cut and digging production potential by kinds of analyses, evaluations and methods for adjustment and digging potential.