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• ~~ <br />Determination of the blanket position is relatively easy to accomplish. Since the inert <br />blanket is usually a nonconducting material, the position of the blanket-water interface can be set <br />by the use of resistance wires or electric probes. <br />The volume occupied by the blanket material is more readily ascertained when a relatively <br />incompressible fluid is used. The volume of space occupied by the inert blanket material and the <br />amount of mass removed below the blanke[ material are much more difficult to ascertain. Mate- <br />rial balance techniques derived by Remson (4) and Kazemi (5) are available, but the practical ap- <br />plica[ion of equations developed has not been proven in large-scale opera ions. See Fig. 10. <br /> '~::.:AIR ;;. INERT <br /> <br />.:;`;~1 j'~;` ;:::` <br /> . <br />AIR <br />. <br />. <br />.. <br />~ ! . <br />.~~ <br />~ ..~; <br />~ : AIR ~.. <br />• .... ~~.> ~. ~ :. <br />~ <br /> <br /> <br />Figure 9. Concentric Washing Strings co Facilitate Formation of Spherically-Shaped <br />Cavirics Using [he Layer Technique, <br />BRINE & <br />INSOLUBLE ~---~ <br />MATERIAL ~ <br />P2 <br />p3 <br />p~ -FRESH <br />~.-. WATER <br />~ BLANKET <br />~~ MATERIAL <br />L <br />Figure 10. Schx-sa[ic Diacram of Washing Process. <br />304 <br />r <br />