| The test area of a tight sandstone gas field reserves has an extremely commercial value to exploit.At the same time,the reservoir is low porosity and low permeability,and the heterogeneity is strong.Only by using the method of multi-stage fractured horizontal well,the reservoir can be transformed to obtain high productivity and good economic benefits.However,because of the short development time and the lack of adjacent well data,the target gas field is not mature and accurate productivity prediction method.In addition,the evaluation results of the conventional testing software and the field of the gas field have a great error.Therefore,it is necessary to study the pressure characteristics of productivity prediction and well testing instability in the target test gas field.First,we use the numerical simulation method to analyze the influencing factors of multi fractured horizontal well productivity,and combined test zones A,B well data,using the numerical simulation method on the productivity of fractured prediction;secondly,optimization of the three linear flow model of the test field of unstable well testing analysis of the sensitive parameters and in a and B well made well test interpretation and evaluation.The results show that the multi fractured horizontal well can greatly improve the productivity of a single well,the fracture number,fracture length,fracture conductivity are important factors affecting the production capacity,by using numerical simulation method to study the factors affecting the productivity and its change rule,and to predict the multi fractured horizontal well production method is more scientific.Fracture permeability anisotropy,fracture diversion capacity and fracture skin factor is an important factor in the effect of multi fractured horizontal well characteristic of the unstable well test,the model of well test of test field fracturing effect evaluation method is feasible. |
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