Study On Multi-horizontal Fracturing Optimization Design Method

In order to improve the producing reservoir with low permeability reservoirs,and improve the horizontal fracture in hydraulic fracturing,fracture optimization design method of fracturing multi horizontal fractures is designed in one oil layer.Firstly,a Calculation method of size for the horizontal fracture dynamic and bracing size on the basis of carter model and Sneddon fracture width formula.Secondly,the derivation principle,consideration and derivation of previous productivity models are analyzed and summarized,then based on Craft method,a productivity model with steady flow of multi horizontal fractures is established,and by using Visual Basic6.0 code productivity calculation software,the effects of fracture parameters are analyzed on oil well productivity.The result shows that the yield of multi horizontal fractures increase with the fracture length,fracture width and fracture conductivity increase,but the rate of increase gradually decreases.Finally,according to the field data statistical analysis,the optimal number of fracture is achieved.On this basis of combination the theoretical analysis and actual field establishing optimization design method of fracturing multi horizontal fractures,liquid volume、displacement and output optimized based on data of Qilicun oilfield are in good conformity.