Research And Application Of Development Technology In Guangli Oilfield During High Water-cut Stage

Guangli oilfield is a fault block reservoir which have some features,such as simple feature, one oil-bearing series, aeolotropic reservoir and high salinity lease water. After developing more 30 years, it is in high water-cut stage. Meanwhile, pipe string corruption is very serious because of high salinity. Well network damaged seriously ordered to low completeness degree. Thus infinite acting decline of crude output lies in high position in oilfield. And oil production rate is small. It became more difficult to stablely product. In view of characteristic of geolopgy and production in Guangli oilfield, the paper mostly researched modeling remaining oil by 3D water/oil displacement streamlined simulation. Distribution and distribution pattern of intraformational and plane remaining oil were evaluated. And distribution of remaining oil of main fault block in Guangli oilfield were calculated at the same time. The rightful reservoir pressure at the moment was certained on the basis of water percentage and deliverability of oilfield. Water intrusion could be calculated. Be based on parameters fitting rates of pressure recovery of different injection-production ratio were predicted by use of material balance theory. Thus fitting injection-production ratio could be determined to keep rightful reservoir pressure in Guangli oilfield. Corruption of pipe string and waterflood system was serious because of high salinity lease water, so some protect corrosion steps were proposed which were well cementation by floating potential cement milk, bigger wall thickness casing, anodic protection ect. The paper developed a systemize research project which included geogoly, reservoir, injection-production, surface necessary and economic assessment. And the project was went to operation. Well network became more completely. Reservoir pressure became more bigger. infinite acting decline and water-cut escalating rate were controlled effectively. Final recovery ratio was raised. The theory provided some guidance sense to Guangli oilfield and homogeneous reservoir in high water-cut stage.