Positive displacement device to improve placement of cement plug

Details Positive displacement device to improve placement of cement plug Positive displacement device to improve placement of cement plug

1994-09-16

1995-11-28

Schoeppel, Roger J.

Wells

Processes

Cementing, plugging or consolidating

166296, E21B 3313

Patent

active

054699185

ABSTRACT:
Cement plugs are positively placed in a wellbore by placement of a bridge plug immediately beneath the depth where the plug is intended and release of a seal allowing flow of cement slurry from a slurry containment tube as the tube is withdrawn to cause a positive piston-like displacement of the fluid in the wellbore.

REFERENCES:
patent: 1676785 (1928-07-01), Lewis
patent: 3116793 (1964-01-01), McStravick
patent: 3131767 (1964-05-01), Chancellor et al.
patent: 3134440 (1964-05-01), Nelson
patent: 3170516 (1965-02-01), Holland et al.
patent: 3208521 (1965-09-01), Holland et al.
patent: 3208525 (1965-09-01), Caldwell et al.
patent: 3872925 (1975-03-01), Owen et al.
patent: 4042031 (1977-08-01), Knapp
patent: 4696343 (1987-09-01), Anderson et al.
patent: 4972906 (1990-11-01), McDaniel

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