Method Study Of Well Net Encrypt Adjustment For Class ? Reservoirs Of Sapugao In Xiqu Block Of Sazhong Oilfiled

Oilfield development of Saertu oil field in Daqing placanticline,Songliao basin,has entered ultra-high water cut stage:water flooding,polymer,coexisting of multiple styles of oil displacement efficiency of chemical flooding.Waterflooding well pattern in Saertu-Putaohua oil reservoir,in the West of Daqing placanticline,has 187 Oil-water Wells.Polymer flooding well pattern in Pu_l oil layer has 102 Oil-water Wells.In Gaotaizi oi reservoir,there are 102 Oil-water Wells,and well spacing density is 71.5 km2 per well.The perforations of basic well and first infilling well are wider,and the effective thickness is smaller than 1.0m,and reservoir drive energy is low.Waterflooding well pattern in Saertu-Putaohua oil reservoir uses five-spot irregularly-shaped pattern well network with an injection production well space of 250?300m.Gaotaizi oil reservoir adopts inverted nine-spot injection pattern with an injection production well space of 300x300m.Its injection rate is large and the production is low,especially the injector-producer distance of the distinct of asymmetric encryption is large,thus reducing the effectiveness of development.As the limitation of the water displacement recovery of these three major oil fields,it should be focused on the enhanced oil recovery(EOR).EOR Technology Improvement of Daqing Oil Field has been leading the international level.Nevertheless,it is analyzed that natural reservoir drive has not be efficiently exploited.This part of the oil layer is thin,poor physical qualities,and spatial distribution is highly fragmented,in relation with the complex water flooded reservoirs;thus it is difficult to exploit relying on the existing well patterns.Well pattern infilling adjustment is one of the widely adopted ways to increase the crude production rate in the development of oil fields in the world.Accordingly,developing the research of wells infilling adjustment and injection production system is benefited in the effects of the development of oil field.It is analyzed the feasibility study and effect evaluation on infilling adjustment of the three major oil reservoirs in the west of Daqing placanticline.It is researched the influencing factors of production decline and the effects of the thin reservoirs.It is also explored the producing mechanism of untabulated reservoir in the water flooding development process in this thesis.