Low density spacer fluid

Details Low density spacer fluid Low density spacer fluid

1983-08-30

1985-07-23

Novosad, Stephen J.

Wells

Processes

Cementing, plugging or consolidating

166285, 166292, E21B 3313, E21B 3700

Patent

active

045304025

ABSTRACT:
A method of completing a wellbore is disclosed wherein a low density spacer fluid is introduced into a wellbore and then a completion fluid, such as a cement slurry, to displace the spacer fluid. The spacer fluid comprises a nonagglomerating carrier fluid, such as water or the like, and discrete dispersible density reducing bodies, such as hollow spheres. The density reducing bodies aid in reducing the hydrostatic head of the spacer fluid, completion fluid, and existing wellbore fluids to prevent the hydrostatic head of such fluids from exceeding the fracture gradient of a highly porous, easily fractured formation.

REFERENCES:
patent: 3030215 (1962-04-01), Veatch et al.
patent: 3365315 (1968-01-01), Beck et al.
patent: 3669701 (1972-06-01), Biederman, Jr.
patent: 3688845 (1972-09-01), Messenger
patent: 3722591 (1973-03-01), Maxson
patent: 3804058 (1974-04-01), Messenger
patent: 4141843 (1979-02-01), Watson
patent: 4234344 (1980-11-01), Tinsley et al.
patent: 4252193 (1981-02-01), Powers et al.
patent: 4370166 (1983-01-01), Powers et al.
patent: 4423781 (1984-01-01), Thomas
Cementing Spacers and Washes Improve Production, by Griffin, Jr. et al., The Oil and Gas Journal, Sep. 12, 1977.

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