Wells – Processes – Cementing – plugging or consolidating
Patent
1983-12-23
1984-11-06
Novosad, Stephen J.
Wells
Processes
Cementing, plugging or consolidating
166295, 106 90, E21B 33138
Patent
active
044806930
ABSTRACT:
The present invention relates to materials which reduce the filtration of fluid into permeable earth formations during cementing processes in the drilling and completing of subterranean wells, particularly wells for the recovery of petroleum resources.
Petroleum well cementing is the process of mixing a slurry of cement, water, and other additives and pumping it down through steel casing to critical points in the oil well annulus around the casing or in the open hole below the casing string. The primary functions of the cementing process are to restrict fluid movement between geological formations and to bond and support the casing. In addition the cement aids in protecting the casing from corrosion, preventing blowouts by quickly sealing formations, protecting the casing from shock loads in drilling deeper wells, and sealing off lost circulation or thief zones.
A common problem in petroleum well cementing is the flow of liquid from the cement slurry into porous earth formations in contact with the cement. This fluid loss is undesirable since it can result in dehydration of the cement slurry, and it causes thick filter cakes of cement solids which can plug the well bore. The fluid lost can damage sensitive formations. Cement fluid loss is particularly a problem in the process known as squeeze cementing.
There is a requirement, therefore, for materials which, when added to the cement formulation, reduce the loss of fluid from the slurry to porous formations.
REFERENCES:
patent: 3116264 (1963-12-01), Wahl
patent: 3140269 (1964-07-01), Wahl et al.
patent: 3359225 (1967-12-01), Weisend
patent: 3994852 (1976-11-01), Adams et al.
patent: 4079011 (1978-03-01), Tate
patent: 4258790 (1981-03-01), Hale
Kitano Kissho
Newlove John C.
Portnoy Robert C.
Schulz Donald N.
Exxon Research & Engineering Co.
Kisliuk Bruce M.
Nanfeldt Richard E.
Novosad Stephen J.
LandOfFree
Fluid loss control in oil field cements does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fluid loss control in oil field cements, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fluid loss control in oil field cements will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1038466