Adaptability Evaluation On Mixed Well Pattern Of Strong Edge Water Small Reservoirs

Chunguang Oilfield is located in the western Junggar Basin uplift,from dozens of small reservoirs formed,its development and formation is neogene shawan group.The oilfield has the characteristics of shallow depth of reservoir,poor compaction,sandstone loose,small oil-bearing area,small sand body thickness,high pore permeability,abundant natural energy and vertical well and horizontal well staggered cloth etc.Through the analysis of the development of multiple reservoirs,it is found that some reservoirs have little difference in physical properties and fluid properties,but the gap between reservoir recovery degree is large.Check the related documents that may be associated with small reservoir shape,The reservoirs were classified according to the reservoir shape,the crude oil viscosity,the coefficient of variation of permeability,the oil content area and the porosity as the main classification parameters,which may be related to the shape of small reservoirs.The traditional reservoir classification method is mainly integrated classification and clustering analysis,the former has the advantage of classification factors are clear and targeted,the drawback is to consider the parameters are too small,for the ChunGuang of this type of reservoir,it can not use a key points to the classification;the latter advantage is to consider more factors,more comprehensive,but the shortcomings are indeed different factors do not distinguish the importance of the classification of the lack of scientific.In this paper,the reservoir classification method is used to combine the advantages of the two methods.Based on the clustering analysis method,the concept of weight is introduced,and the concept of reservoir shape coefficient is put forward by referring to the analysis method of fault block reservoir.The parameters are matched with the weight values,and the comprehensive classification index is obtained.Finally,the classification is classified according to the comprehensive classification index.Through the numerical simulation of the reservoir,the adaptability evaluation of the well pattern is carried out,and the optimal well pattern deployment of the reservoirs at the early stage of development is analyzed and analyzed,which provides the theoretical basis for the well-developed well pattern.