The Research On Well Test Interpretation Method And Injection-production Capability Of Shuang-6 Gas Storage

Shuang-6 Gas Storage of Liaohe oilfield has the characteristics of medium-pore and medium-permeability.In order to ensure the safe,stable and efficient operation of Shuang-6 Gas Storage,it has conducted shut-in pressure measuring and systematic well test many times.In this paper,well test interpretation of 52 well times have been performed to obtain reliable reservoir physical parameters and analyze the change law of reservoir physical properties.Analysis methods of nodal analysis,critical fluid carrying flowrate and critical erosion flowrate were applied to research on the injection-production capability of gas wells.The grey correlation method was used to analyze the effect factors of injection-production capability for the gas wells of Shuang-6 Gas Storage.At last,using the material balance equation of gas injection process,this paper predicted the storage capacity and the effective working gas volume of Shuang-6 Gas Storage.The research results of this paper show that the connectivity of three sets of reservoirs Xing-?,Xing-?and Xing-?is better,and the effective permeability of Xing-?is higher than that of Xing-?and Xing-?;with the increase of gas injection volume,the effective permeability of single well and block increases,and the reservoir exists the stress sensitivity phenomenon.The major influencing factors on the injection-production capability for gas wells of Shuang-6 Gas Storage are tubing size,reservoir effective permeability,reservoir effective thickness,formation pressure,well head pressure,and Shuang-6 Gas Storage should select the tubing with an inner diameter of 100.3mm,and the reasonable gas production volume range of gas wells is73×10~4m~3/d~100×10~4m~3/d,and the reasonable gas injection volume range of gas wells is 139×10~4m~3/d~145×10~4m~3/d.The maximum storage capacity of Shuang-6 Gas Storage is 39.10×10~8m~3,and the corresponding effective working gas volume is28.41×10~8m~3 with the operating pressure range is 10MPa~24MPa,which is equivalent to 72.66%of the maximum storage capacity.In order to improve the efficiency of field test,it is suggested that the test time of systematic well test should be shortened to1/2~2/3 of the original test plan.The research results are applied to the prediction of injection-production capability and the injection-production proration of Shuang-6 Gas Storage,and good results have been achieved.