Water Invasion Dynamic Analysis Of High Sulfur Containing Water Gas Reservoir

It is general containing water at the bottom of high sour gas reservoir in northeast Sichuan.It is complex relation between gas and water and easy to form water channeling,which causes some damages of formation and wellbore and can result in gas well stopping production when water invasion is serious.Therefore,water invasion dynamic analysis problems need to be solved,and a numerical model for dynamic analysis of water invasion need to be established,which provides the basis for the effective water controling,water plugging and water draining in high sulfur gas reservoir.To better understand water invasion rules of the high sulfur gas reservoir,the impact of water to high sulfur gas reservoir fluid properties was researched by indoor experiment in this paper.Meanwhile,combined with water mechanism,identification,edge water and bottom water breakthrough time model,and numerical model of three-phase,influence of the gas reservoir containing water,gas components,initial sulfur content,daily production on gas reservoir dynamic production in high sulfur gas reservoir with water.Lastly,the main achievements of this dissertation in this paper are as follows:(1)Studied the influence of gas containing water on the physical properties of high sulfur gas reservoirs by indoor experiments.The analysis shows that gas containing water has no effect on its gas deviation factor and phase diagram and its viscosity is seriously affected by low pressure.(2)Due to the influence of acid gas containing water on gas viscosity,the influence of water on the composition of acidic gases is corrected by introducing the calculation of water content and correction of components of acid gas.Then,the viscosity model of containing water acid gas was established and it can be found that the higher the H2S and CO2 contained in acid gas,more accurate the model predicted viscosity of the hydrous acid gas.(3)Researched gas reservoir water invasion mechanism and combined with the field data,find that water invasion direction of high sulfur gas reservoir is integrated seam propulsion.Then,according to water production character,a dynamic identification recognition water invasion method of high sulfur gas reservoir is presented through the change of the wellhead pressure,H2S content and water and gas ratio.(4)Considering the damage of sulfur precipitation on formation permeability in high sulfur gas reservoir development process,a sulfur deposition model was established.At the same time,a gas-well water breakthrough time prediction model for high-sulfur gas reservoirs considering sulfur deposition was established further by sulfur deposition model and seepage model.Last,it is find that sulfur deposition,the bottom flow pressure,flowing state has greatly influences on the gas-well water breakthrough time.(5)Based on the three-phase seepage mathematical model and water invasion mechanism model,we use Matlab programming through the numerical difference method to solve the mechanism model of high sulfur gas reservoir with bottom water and fracture.And,the effect of the size of water body,sulfur deposition and other factors on the development of gas reservoirs was analyzed by this model.The results show that gas reservoir containing water,gas reservoir gas components has little influences on stable time,cumulative gas production and cumulative water production,recovery,water gas ratio rise velocity of high sulfur and fracture gas reservoirs with bottom water,but gas reservoir initial sulfur content,size of daily production,size of the water body has greatly influences on its.