Incremental density cementing spacers

Details Incremental density cementing spacers Incremental density cementing spacers

1990-02-26

1991-07-02

Britts, Ramon S.

Wells

Processes

Cementing, plugging or consolidating

166 50, 166153, 166292, E21B 3300

Patent

active

050279009

ABSTRACT:
A method of cementing in a wellbore penetrating subterranean formations characterized by employing a graded density spacer fluid intermediate a displacing fluid and a displaced fluid. This is particularly advantageous where a cement slurry is employed as displacing fluid to displace drilling fluid employed to drill a well penetrating subterranean formations. This alleviates problem with intermixing of the two fluids. This invention is doubly advantageous where a well contains both a substantially vertical portion and a substantially horizontal portion, since in the latter portion, the use of this invention enables controlling under-running or over-running of a displacing fluid with respect to a displaced fluid.

REFERENCES:
patent: 2582909 (1952-01-01), Laurence
patent: 2590814 (1952-03-01), Cardwell et al.
patent: 3850248 (1974-11-01), Carney
patent: 4083407 (1978-04-01), Griffin et al.
patent: 4124075 (1978-11-01), Messenger
patent: 4141843 (1979-02-01), Watson
patent: 4217229 (1980-08-01), Watson

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