Process and composition for cementing casing in a well
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. 13 claims, 5 figures.
- Assignee:
- Standard Oil Co. (Indiana)
- Patent Number(s):
- US 4036301
- OSTI ID:
- 7219299
- Resource Relation:
- Patent File Date: Filed date 12 Jul 1976
- Country of Publication:
- United States
- Language:
- English
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