Process for cementing casing in a well

Details Process for cementing casing in a well Process for cementing casing in a well

E - Fixed Constructions

21

B

166/17

E21B 33/14 (2006.01)

Patent

CA 1070236

ABSTRACT OF THE DISCLOSURE A process for reducing the waiting-on-cement (WOC) time assoc- iated 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 tempera- ture above the bottom-hole circulating temperature but below the bottom- hole 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 particu- larly suitable as the meltable encapsulating material exhibiting excel- lent 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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