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

E - Fixed Constructions

21

B

166/17

E21B 33/13 (2006.01) C04B 24/04 (2006.01) C04B 24/22 (2006.01) C04B 28/04 (2006.01) C09K 8/24 (2006.01)

Patent

CA 1311190

ABSTRACT OF THE DISCLOSURE 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 composi- tion containing the dispersant and being rheologoically compati- ble with both the drilling fluid and the drilling fluid converted to cement slurry may be used as a displacement fluid.

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