Method to cement a wellbore

Details Method to cement a wellbore Method to cement a wellbore

1994-05-23

1995-04-25

Novosad, Stephen J.

Wells

Processes

With indicating, testing, measuring or locating

166290, 166292, 166384, 166295, E21B 1922, E21B 3313, E21B 3314

Patent

active

054090717

ABSTRACT:
A method to cement a wellbore is provided wherein two fluids are transported into the wellbore through separate conduits, and combined within the volume to be cemented. The two fluids set to become a hardened cement after a short time period. The two fluids are preferably passed through a static mixer at the ends of the conduits within the wellbore to provide uniform contact between the two fluids. The two fluids are preferably a wellbore cement and an accelerator for that cement. Because the cement sets within a short time period, fluid loss from the wellbore is minimal. Additionally, the static head to which the formation is exposed is not excessive, even if a cement slurry having a density that exceeds the hydraulic fracture gradient of the formation is used.

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patent: 4673035 (1987-06-01), Gipson
patent: 4867240 (1989-09-01), Colla

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