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《Natural Gas Industry》 2008-01
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SINGLE WELL NUMERICAL SIMULATION OF LOW-PERMEABILITY GAS RESERVIOR WITH CONSIDERATION OF STARTING PRESSURE GRADIENT

ZHANG Lie-hui,XIANG Zu-ping,FENG Guo-qing(State Key Laboratory of Oil & Gas Geology and Exploitation,Southwest Petroleum University)  
In the gas reservoirs having been discovered,low permeability and extra-low permeability reservoirs take up a rather high proportion,and fluid percolation in these reservoirs is relatively complex and has special percolation characteristics(i.e.the existence of starting pressure).Besides,the flow of fluids in porous media is not accordant with the Darcy's Law.Therefore,it has a great significance for the development of low permeability gas reservoirs to study and pay attention to the starting pressure phenomena.However,the influence of starting pressure gradient is not taken into account in the large-scale commercial software of reservoir numerical simulation.Thereby,three-dimensional,gas-water two-phase-flow numerical model has been established on the basis of seepage mechanics with the consideration of starting pressure gradient and the corresponding numerical simulation software has been programmed.By the comparison with calculation results of commercial software-CMG,it is believed that the software programmed is reasonable and reliable.Then,by means of simulation calculating of the gas field at different starting pressure gradients,the results show that starting pressure gradient has significant effect to the production performance of the low-permeability gas reservoir in gas fields.Development index,such as production prediction,will be obviously higher without regard to the starting pressure gradient.Therefore,the effects of the starting pressure gradient should be fully considered when predicting the program of the production performance,so as to work out the developing program which can guide the development of low-permeability reservoirs more accurately.
【Fund】: 中国石油科技中青年创新基金项目(编号:04E7047);; 教育部博士点基金项目(编号:20040615004);; 四川省学术和技术带头人培养基金(编号:2200320)项目;; 高等学校优秀青年教师教学科研奖励计划(TRAPOYT)联合资助
【CateGory Index】: TE319
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