Method of changing well fluid

Details Method of changing well fluid Method of changing well fluid

1989-04-05

1990-01-16

Dang, Hoang C.

Boring or penetrating the earth

Processes

Boring with specific fluid

166153, 166175, 166312, 175262, 175316, 175324, E21B 700, E21B 3704

Patent

active

048936847

ABSTRACT:
A well bore annulus wiper plug is disclosed. The wiper plug has a central body and inner and outer elastomeric ribs. The ribs are generally in the shape of truncated cones. To operate the device, it is inserted in the annular space between well casing and a drill string. Fresh drilling mud is circulated downwardly through the annular space above the wiper plug. The wiper plug scrapes both the outside of the drill pipe and the inside of the casing free of a previous well fluid.

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