US PATENT SUBCLASS 507 / 928
.~ Spacing slug or preflush fluid

Current as of: June, 1999
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507 /   HD   EARTH BORING, WELL TREATING, AND OIL FIELD CHEMISTRY

927  DF  WELL CLEANING FLUID {3}
928.~ Spacing slug or preflush fluid

DEFINITION

Classification: 507/928

Spacing slug or preflush fluid:

Subject matter under art collection 927 wherein the well cleaning fluid is (i) a slug of fluid intended to separate a previous fluid from a following fluid, sometimes because of the incompatability of the two fluids, or (ii) a fluid intended to remove a filter cake which is no longer desired.