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Experimental Studies of Salt Cavity Leaching Via Fresh-Water Injection

机译：淡水注入盐穴浸出试验研究

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Salt cavity leaching experiments were conducted in the laboratory in support of the U.S. Strategic Petroleum Reserve (SPR) program. Cavities of an initial cylindrical geometry were created by machining salt cores from one end, leaving the circular wall and bottom as an integral piece. In each of three separate experiments, a salt cavity was placed vertically in a pressure vessel and its interior filled with saturated brine. The vessel was sealed and pressurized to actual SPR-cavern pressure. Fresh water was injected down a tube and into the cavity, while brine was simultaneously removed from the cavity through a second tube. Both direct (injection below withdrawal) and reverse (injection above withdrawal) leaching procedures were investigated for essentially the same flowrate conditions and total withdrawal time. A traversable gamma-beam densitometer was positioned between the injection and withdrawal locations in each case, and was used as a non-intrusive diagnostic technique to investigate transient phenomena which occurred during the leaching, and postleaching (return-to-equilibrium) periods. Beam attenuation measurements yielded a quantitative measure of two (combined) effects: (1) the total (time-integrated) salt-wall recession and (2) the instantaneous (path length-averaged) brine salinity. Final cavity shapes were measured both by gamma-beam densitometry and by sectioning/micrometer techniques. Transient and steady-state measurements were then compared with numerical predictions, generated with SANSMIC (the Sandia Solution-Mining Code), in order to assist in the qualification of this code for actual SPR-cavern applications. Experimental results and numerical predictions were found to be in good agreement. (ERA citation 09:029054)

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