Numerical Simulation And Well Pattern Optimization Of Horizontal Well In Sulige Gas Field Development

Sulige gas field is the largest natural gas field discovered in China so far,and it is also a typical representative of tight sandstone gas reservoir,the characteristics of Sulige gas field,such as low abundance,low permeability,low yield and strong heterogeneity,make the straight wells which have been put into operation appear some problems such as shorted stable production period,low production,fast declined pressure.In view of this situation,the horizontal well technology has been widely used in oil and gas field development as an important means to achieve effective and large-scale development.This paper takes block Su6 which is a typical block in Sulige gas field as the research object,combined with geological characteristics of the gas reservoir in this block,and establish geological model and numerical simulation model of block Su6 on the basis of existing data,then based on theoretical study and practical experience of horizontal wells in gas fields both at home and abroad,this paper conducted a comprehensive study in well pattern,well distance,row distance,length of horizontal section,orientation of horizontal section,and number of the fracture section,crack length,crack spacing,summed up multiple sets of well pattern for the gas reservoir,and then use oil and gas reservoir numerical simulation method to optimize from the above programs so as to obtain a most suitable well network for the gas reservoir,and provide a theoretical basis for the efficient development of Sulige gas field.Finally the optimum well pattern type is staggered well pattern combined with horizontal and vertical well,well distance is 800 m,row distance is 1000 m,designed length of horizontal section is 1000 meters,horizontal direction is from north to south,number of fracture is 7,length of fracture is 180 m,and through this scheme the effect of exploitation can be best.