Optimization Of Hydraulic Fracturing Parameters For Fractured Tight Sandstone In DX1

The tight sandstone gas reservoirs are rich in reserves,but the reservoirs have the geological characteristics of low porosity and low permeability,heterogeneity and so on.Reasonable fracture parameter design plays an important role in improving gas well productivity.The DX1 gas reservoir is a important development block of the Tarim Oilfield as well as a typically fractured tight sandstone gas reservoir.In the past,8 wells had been stimulated,but the result of productivity is quite different.The aim of this paper is to design the optimal fracturing parameters based on the geological and engineer ing factors of a single wel.Firstly,the influencing factors of the productivity were analyzed from the two aspects of geology and engineering in this paper.In the analysis of geological factors,oil saturation,porosity and shale content wrer selected as important factors.And the reservoir evaluation formula was established by nonlinear regression.According to the analysis of engineering factors with the mathematical model,the fracturing fluid and the proppant parameters were the key influencing factors of productivity.Then,after the fine fracturing simulation and productivity prediction on the key wel s through GOHFER software.A fracturing simulation and production prediction workflow was formed of DX1.Based on the results of influencing factors analysis,an NPV optimization model considering the reservoir properties and engineering parameters was established.Finally,combined with the NPV optimization model and the numerical simulation method,a set of fracturing parameters optimization process was established for the DX1 gas reservoir.And the new well X11 was fractured optimized design with this method.From the simulation results,the NPV was improved by more than 1.5 times compared with the previous scheme.The studies of this paper provide technical support for the further high-efficie nc y development of DX1 gas reservoir,and have certain guiding significance for the effic ie nt development of the tight sandstone gas reservoirs.