US PATENT SUBCLASS 507 / 935
ENHANCED OIL RECOVERY

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

935ENHANCED OIL RECOVERY {1}
936  DF  .~> Flooding the formation {1}

DEFINITION

Classification: 507/935

ENHANCED OIL RECOVERY:

Subject matter wherein the well treating composition is directly or indirectly useful in obtaining oil from an oil bearing formation after primary recovery is complete (i.e., after the oil ceases to enter the well on its own).