Cementing oil and gas wells using converted drilling fluid
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United States of America Patent
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Nov 28, 1989
Grant Date -
N/A
app pub date -
Dec 11, 1987
filing date -
Dec 11, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Wellbores are cemented with a cement composition formed from drilling fluid occupying the wellbore by circulating a quantity of drilling fluid mixed with a cement material and a dispersant such as a sulfonated styrene copolymer with or without an organic acid into the wellbore to displace the drilling fluid and to continuously convert the drilling fluid into the cement composition. The cement composition may be recirculated through the space in the wellbore to completely evacuate any drilling fluid not converted to cement so as to minimize any faults in the cement composition occupying the wellbore. A preflush composition containing the dispersant and being rheologoically compatible with both the drilling fluid and the drilling fluid converted to cement slurry may be used as a displacement fluid.
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