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AssigneeAtlantic Richfield Company
InventorsWilliam N. Wilson, Leon H. Miles, Brett H. Boyd, Robert B. Carpenter
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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.
A method for cementing a wellbore penetrating an earth formation into which a conduit extends, said wellbore having a space occupied by a drilling fluid to be converted to cement for cementing said space to form a seal between spaced apart points in said formation, said method comprising the steps of:
A method for cementing a space in a wellbore penetrating an earth formation wherein said space in said wellbore is occupied by a drilling fluid, said method comprising the steps of:
A method for cementing a wellbore penetrating an earth formation into which a conduit extends, said wellbore having a space occupied by a drilling fluid to be displaced by a cement composition for cementing said space to form a seal between spaced apart points in said formation, said method comprising the steps of:
Dependencies are inferred from the claim text.