The Waterflood Development Adjustment Plan Of North WangChang Oilfield

Wangchang Oil Field is located at the north of Qianjiang Sag,JiangHan Oil Region,the main part is a long axis of anticlinal structure.On the surface of the oil group in the north area of Wangchang Oil Field,it shows that the production capacity of the southwest and the shaft well is high,the output of the north and the northeast is low,and the production capacity of the oil well is quite different.In this paper,the 3D geological modeling and reservoir numerical simulation method are used to provide technical support and development adjustment plan to improve the actual output of the block.This article through to the Wangchang oil fields in the north district comprehensive analysis of logging data,combining previous research results on the block sedimentary environment,the north is divided into five sedimentary microfacies: underwater distributary channel,between the cephalic margins of the underwater distributary channel,underwater distributary channel,underwater natural levee,and river dam.The main distribution of sand in north area is distributary channel and channel side.The microfacies distribution of the northern region was further developed by subdivision of sedimentary microfacies.Based on getting the distribution of the phase diagram,the method of using phased modeling,fine 3 D geological model is established,and the construction of the reservoir north Wangchang have a model,the micro facies model and property model.Through dynamic numerical simulation of geological reserves,oil and gas production,water content and other indexes history matching and reserve double calculation,combined with analysis on the influence of geological and developing factors the oil fields in the north Wangchang have a residual oil distribution.Wangchang north reserves on the longitudinal field oilfield is mainly distributed in the latent 4^0-1,latent 4^2-3 and dives under 4²,the rest of the layers of reserves are very few,therefore hidden 4^0-1,latent 4^2-3 and dives under 4² is the next step of reservoir development focus.Against the Wangchang field at present in the development of oil fields in the north,water cut rising fast,injection-production system imperfect,poor water injection results,this study analyzed the water injection effect,get in the water injection of three kinds of typical injection work mode: rapid water,thick sand connected and thin sand pinchout type;Through the analysis of the three kinds of water injection,only the thick sand connected water injection is good.Rapid water mainly due to the high parts injection this area and mainland area layer dip Angle is about 50 °,the injected water flow down quickly,low parts production fast water;The main result of the thin sand is that the water injection has not been achieved because of the lack of understanding of the sand body and the ineffectiveness of the sand body.The research in view of the above found several injection type,combining with the oilfield subdivision formations and well pattern infill and injection-production system adjustment potential,compiled to improve waterflood effect,increase the degree of effective use of reserves as the main content of adjustment scheme,mainly including the imperfect injection-production well pattern of region to fill holes or encryption,the area of stratum energy shortage adopts stratified water injection,provide the basis for reasonable development of oilfield in future.