Simulation Study Of Hydraulically Fractured Horizontal Well In Tight Gas Reservoir

The term”Tight gas” is generally used to allude to unconventional reservoirs having ultralow permeability hence requiring exceptional methods to simulate production.Generally,hydraulic fracturing coupled with multilateral horizontal wellbore are utilized to improve the reservoir recovery and production efficiency.With the world's estimatedtight sand gas reserves of above 823 TCF,it is imperative to analysis way to yield its production.This thesis seeks to analysis the various impacts of reservoir and parameters on the production of tight gas reservoirs.The primary objective of this study is to model the performance from hydraulically fractured horizontal wells in low-permeability tight gas reservoirs,especially horizontal wells with multiple fractures.In this research,an analytical and numerical simulation approaches will be used to represent the performances of fractured horizontal wells in tight-gas reservoirs.The dual porosity and trilinear model formulation are used to derive closed-form analytical expressions for the change of the productivity of fractured horizontal wells in tight-gas reservoirs as a function of horizontal well,hydraulic fracture,natural fracture,and matrix properties.Firstly,a tight gas reservoir will be modeled using the commercial reservoir simulator(CMG/GEM 2012)and the results will be generated for a range of the selected properties around the single-porosity(SP)and dual-porosity(DP)models where sensitivity analysis will be done.Secondly,a naturally fractured tight gas reservoir is modeled with the commercial reservoir simulator(PETREL)and imported into CMG/GEM 2012 simulator for simulation and sensitivity analysis under the dual permeability model.These models(single porosiy,dual porosity and dual permeability models)satisfy the analytical dual-porosity and trilinear flow model.Charts will also be used to demonstrate the sensitivity of the productivity to the variations of the selected factors.Results from the sensitivity analysis show how hydraulically fractured tight gas reservoirs represented with single porosiy,dual porosity and dual permeability models reacts with varying properties of hydraulic fracture(width,spacing and halflength).It also shows the effect of fracture conductivity on the sensitivity performance of these models.