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3-D Finite Element Analyses of the Egan Cavern Field

机译：伊根洞穴场的三维有限元分析

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Three-dimensional finite element analyses were performed for the two gas-filled211u001estorage caverns at the Egan field, Jennings dome, Louisiana. The effects of 211u001ecavern enlargement on surface subsidence, storage loss, and cavern stability were 211u001einvestigated. The finite element model simulated the leaching of caverns to 6 and 211u001e8 billion cubic feet (BCF) and examined their performance at various operating 211u001econditions. Operating pressures varied from 0.15 psi/ft to 0.9 psi/ft at the 211u001ebottom of the lowest cemented casing. The analysis also examined the stability of 211u001ethe web or pillar of salt between the caverns under differential pressure 211u001eloadings. The 50-year simulations were performed using JAC3D, a three dimensional 211u001efinite element analysis code for nonlinear quasistatic solids. A damage criterion 211u001ebased on onset of dilatancy was used to evaluate cavern instability. Dilation 211u001eresults from the development of microfractures in salt and, hence, potential 211u001eincreases in permeability onset occurs well before large scale failure. The 211u001eanalyses predicted stable caverns throughout the 50-year period for the range of 211u001epressures investigated. Some localized salt damage was predicted near the bottom 211u001ewalls of the caverns if the caverns are operated at minimum pressure for long 211u001eperiods of time. Volumetric cavern closures over time due to creep were moderate 211u001eto excessive depending on the salt creep properties and operating pressures. 211u001eHowever, subsidence above the cavern field was small and should pose no problem, 211u001eto surface facilities.

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