Use of marker fluid in cementing offshore wells

Details Use of marker fluid in cementing offshore wells Use of marker fluid in cementing offshore wells

1981-05-14

1983-07-05

Novosad, Stephen J.

Wells

Submerged well

Testing

106 90, 166253, 166293, 166362, E21B 3314

Patent

active

043913296

ABSTRACT:
Cementing casing in an offshore well by displacing a drilling fluid with a settable cement slurry wherein there is injected into the annulus between the sidewall of the well and the casing ahead of the cement slurry a slug of a visually identifiable marker fluid containing cement, water, particulate carbon black, coal dust, and a surface active agent; visually observing when the fluid being displaced from the annulus changes from drilling fluid to marker fluid, and shutting in the well to allow the cement slurry to set.

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