Patent ID: 11932804
Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A method, comprising:
(a) preparing a spacer fluid comprising: water, a viscosifying agent, and an expanding agent comprising calcium oxide or calcined magnesium oxide or both;
(b) during a well cementing operation, placing a drilling fluid, the spacer fluid, and a cement slurry into a well such that the spacer fluid flows between the drilling fluid and the cement slurry;
(c) causing the spacer fluid to commingle with the drilling fluid or the cement slurry, or both, thereby forming an interface; and
(d) curing the cement slurry and the interface, wherein the interface expands or does not shrink upon the curing,
wherein the expanding agent is present in the spacer fluid at a concentration between 0.1 wt% and 20 wt%, and
wherein the expanding agent is suspended in a non-aqueous additive comprising a hydrocarbon liquid, and the expanding agent is present in the non-aqueous additive at a concentration between 10 wt% and 80 wt%.