Drilling and cementing extended reach boreholes
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United States of America Patent
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Sep 6, 1994
Grant Date -
N/A
app pub date -
Oct 22, 1992
filing date -
Oct 22, 1992
priority date (Note) -
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Abstract
An extended reach well such as the deviated wells typically drilled from offshore platforms is drilled using a drilling fluid comprising blast furnace slag and water which drilling fluid is circulated during the drilling to lay down a filter cake. Thereafter, an activator is added and generally, an alkaline material and additional blast furnace slag, to produce a cementitious slurry which is passed down a casing and up into an annulus to effect primary cementing.
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