Technologies and practices on the storage capacity and production achieved in Wen 96 UGS
Using reservoir engineering approaches,we dynamically discussed an actual operation in Wen 96 underground gas storage(UGS)from two aspects of water invasion and small range in pressure run constraining both storage capacity and production achievement.And several countermeasures were also made for this achievement.Results show that(i)four technologies,which are conducive to achieving both storage capacity and production in this UGS,contain edge water con-trol,well pattern control,injection-production engineering without tripping tubing string,and pressure enlargement.The in-jection-production well pattern is further improved by the newly drilled adjusting and renewal wells to draw upon not only working gas volume at the late injection-production period but marginal uncontrolled reserves in the upper submember of the Paleogene Shahejie 3 Member.As a result,the incremental working gas volume is 0.35×108 m3;(ii)mechanisms on pro-duction run are optimized to condition the edge-water invasion after core experiments to evaluate this invasion affecting both storage capacity and working gas volume;(iii)some injection-production measures are taken to solve liquid accumula-tion and salt precipitation so as to improve injection-production capacity;and(iv)the injection-production pressure range is enlarged to meet the UGS's run under the designed maximum and minimum pressure of 27 MPa and 12.9 MPa on maxi-mizing the recoverable production.It is concluded that the stated results contribute to expanding the capacity on the basis the capacity achievement to ultimately improve the working gas volume.
UGSWorking gas volumeInjection-production capacityStorage capacityProduction achievement
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