The Study On The Remaining Oil Distribution In ⅠOil Group Of Lower Es₃Eservior In Block Zhuang52of Wuhaozhuang Oilfield

Block Zhuang52of Wuhaozhuang oilfield is located in the northeast slope belt ofZhanhua sag in Jiyang depression, which is separated from Block Zhuang66by the faultnorth of Zhuang52and adjacent to Block Zhuang75in the south. The target bed isⅠOilGroup of Lower Es3Reservior and its buried deepth is about3100~3300meters. It developedlake gravity flow turbidite fan sedimentary system. Gudao buried hill in the south andChangti buried hill in the east are the main source area. The north of the study area is thestructural high part, and a number of secondary normal faults formed there, as well as4layers and9single sand bodies. By analyzing the static and dynamic data of the reservoir,problems can be found in various aspects, such as interlayer distinct differences, imbalanceddegree of reserve recovery, low single well productivity, low oil recovery rate, serious waterflooded extent, a number of non-production and water-injection halted wells, long time of thewell shutting, low injection-to-producing-well corresponding ratio and extremelyuncompleted injection recovery, which increase the difficulty of the oilfield development.Aimed at deepening the understanding of Block Zhuang52reservior and looking for theenrichment area of remaining oil, this paper summarizes the reservoir characteristics, dividesthe development phases, analyzes the development rules, evaluates the development effectand recovery ratio taking into account the current situation of Block Zhuang52. In the lightof reservoir geological and development characteristics, it establishes the three-dimensionalfine geological model, based on which the detailed history fitting, including reserves fitting,pressure fitting and water cut fitting, and eventually comes to a fine model accordant togeological and development situation.On the basis of reservoir engineering analysis and numerical simulation, conclusion ofthis research indicates that the north of the west block is developed most effectively and the east block has enrichment of remaining oil horizontally, while vertically layer1has thehighest recovery degree and the remaining recoverable reserve of layer2is the mostsignificant. The control factors of the remaining oil distribution include the reservoirsedimentary characteristics, reservoir rhythmicity, pore structure, fault, insulation sandwich,fluid properties and the development factors such as the well network and perforation. Basedon comprehensive evaluation and prediction from multiple perspectives to research theremaining oil distribution, this paper puts forward some technical strategies and developmentadjustment assumption, which consists synthesizing regulation to sub-well, setting ahierarchical system, continuation of water injection, improving a better injection-productionpattern and taking some technologic measures, and consequently it will improve thedevelopment level of the oilfield.