Wellbore cementing method

Details Wellbore cementing method Wellbore cementing method

1993-07-23

1994-08-09

Novosad, Stephen J.

Wells

Processes

Cementing, plugging or consolidating

166383, 166384, E21B 1922, E21B 33138, E21B 3314

Patent

active

053357256

ABSTRACT:
A method for cementing a wellbore wherein a slurry comprising at least five percent by weight of particles having a particle size greater than about 0.04 inches is placed in the wellbore. The slurry has a density which exceeds the hydraulic fracture gradient of the formation but the slurry is not lost to fractures because the larger particles enable the solids in the slurry to bridge and prevent excessive slurry loss. The cement slurry of the present invention is preferably placed in the wellbore by a direct placement method such as a coil tubing placement to minimize the pressure placed on the formation by any particular cement slurry.

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patent: 5058679 (1991-10-01), Hale et al.
patent: 5226961 (1993-07-01), Nahm et al.

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