Cementing oil and gas wells using converted drilling fluid

Details Cementing oil and gas wells using converted drilling fluid Cementing oil and gas wells using converted drilling fluid

1987-12-11

1989-11-28

Suchfield, George A.

Wells

Processes

Cementing, plugging or consolidating

166293, 175 66, E21B 3314, E21B 3316

Patent

active

048831255

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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