| It puts forward higher requirements for the accuracy and timeliness of reasonable production and injection allocation level and productivity of gas wells because of the operation mode of short-term strong injection and production of gas storage and the functional positioning of peak shaving and supply.Under the condition of high-speed cyclic injection and production of gas storage,periodic and frequent changes of formation parameters and fluid distribution result in periodic changes in gas well productivity,,which is influenced by periodic gas-water interactive displacement,mixing of injected dry gas and formation in-situ fluid.The existing productivity evaluation methods do not fully consider the changes of multi cycle parameters,and there are some errors in capacity evaluation.By comparing the differences between gas reservoir development and injectionproduction operation of gas storage,this paper uses indoor physical simulation method to reveal the reasons for the changes of periodic injection production,storage and permeability parameters,and deeply analyzes the limitations of existing productivity evaluation methods.Comparing the application scope of traditional production decline analysis method and modern production instability analysis method,Blasingame in modern production instability analysis method is optimized to fit the production data of gas storage and obtain the reservoir parameters of gas well in this cycle.Based on the results of physical simulation and output of transient analysis,the existing productivity evaluation equation is modified.Taking wellbore lifting,wellhead pressure,critical liquid carrying flow,critical erosion flow and critical sand production pressure difference as constraints,comprehensively determine the reasonable deliverability of gas wells.Optimizing the monthly periodic production allocation of H gas storage by Comparing the gas production capacity calculated by different methods and combinating with peak shaving demand and safety.The research results are of great significance to optimize the reasonable producing pressure difference of H gas storage,optimize production allocation,improve the deliverability of single well and ensure the safe operation of gas storage. |
