Research On Numerical Simulation Of Gas Injection After Volume Fracturing In Tight Reservoirs

The ability of liquid production force from matrix to wellbore is very low of tight reservoir,generally no natural production capacity,the use of conventional fracturing measures to form a single fracture is difficult to obtain a good yield effect.In order to realize the effective development of this kind of reservoir,the horizontal volume ‘network' fracturing technique is used to increase production and transformation,and the hydraulic fractures and the natural fractures intersect or turn within the reservoir to form complex network.The development of the reservoirs is carried usually in the form of depleted development,and the development methods of supply energy in the reservoirs of water and gas injection are less in tight reservoirsAfter the hydraulic fracturing communicate with the natural fractures in the tight reservoir,the natural fractures begin to crack and extend,and the geometrical dimensions and complexity of the fractured network are determined by a variety of factors.In this study,the DFN discontinuous fracture network model was used to analyze the influence of different geological parameters and engineering parameters on the expansion of complex network after fracturing,and the effect of fracturing effect was given,which was beneficial to produce network and increase the stimulated reservoir volume.Then,the Meyer software is used to design the volume fracturing of a horizontal well in Changji Oilfield,simulate the fracturing construction,optimize the fracture parameters and engineering parameters,and obtain the distribution pattern and parameters of the complex network.The results show that the complex fracturing network can be obtained by using the fracturing engineering scheme.In this paper,the complex network of fractured horizontal well is established by the method of local grid refinement in CMG software,and the numerical simulation of gas injection in tight reservoir is carried out.Including the development method,well pattern,SRV volume,matrix permeability,flow conductivity.Finally,the numerical simulation model of reservoir in the Lucaogou Formation in Changji Oilfield of Xinjiang is taken as an example to establish the numerical simulation model of reservoir.The optimal form of well pattern,well spacing and row spacing for gas injection is given,Effect Forecasting is giving then.