Wells – Processes – Cementing – plugging or consolidating
Patent
1976-07-12
1977-07-19
Novosad, Stephen J.
Wells
Processes
Cementing, plugging or consolidating
106 96, 106315, 166295, E21B 3314
Patent
active
040363015
ABSTRACT:
A process for reducing the waiting-on-cement (WOC) time associated with the cementing of a casing string in an oil well involving the specific improvement of pumping into the well a highly retarded cement slurry containing a dispersed encapsulated accelerator, such as calcium chloride or anhydrous sodium metasilicate, wherein the encapsulating material is specifically selected such that it will melt at a temperature above the bottom-hole circulating temperature but below the bottomhole static temperature of the well to be cemented. Petroleum-derived waxes and petroleum-derived waxes in combination with vinyl resins, such as wax-compatible copolymers of ethylene and vinyl acetate, are particularly suitable as the meltable encapsulating material exhibiting excellent strength and abrasion resistance as well as serving as a moisture barrier. The improved process is particularly useful in cementing deep hot wells.
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Taylor, W. H., Concrete Technology and Practice, (1965), published by American Elsevier Co., Inc., N. Y., pp. 185, 357 and 612.
Holman George B.
Powers Charles A.
Smith Robert C.
McIlroy Arthur
Novosad Stephen J.
Standard Oil Company (Indiana)
Stevenson Robert B.
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