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US 5,547,506 AGranted
Storable liquid cementitious slurries for cementing oil and gas wells
AssigneeBJ Services Company
InventorsPhilip Rae, Neil Johnston
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Abstract
In the method of the invention, a storable hydraulically-active cementitious slurry is made and used to cement within subterranean foundations for oil and gas wells. The slurry is made from hydraulically-active, cementitious material suitable for oil field purposes and can be stored until needed. During storage, the slurry remains liquid. The slurry is activated when needed for cementing. After pumping the activated slurry into the wellbore, the set cement has properties acceptable for well cementing.
Claims17
A storable, hydraulically-active, cementitious slurry comprising:
- a hydraulically-active cementitious material suitable for cementing within subterranean formations for oil or gas wells;
- an effective amount of a set retarder to allow the storage of the slurry with a minimal change of the slurry's set characteristics upon activation and to allow the reversal of retardation after adding an effective amount of an activator to the slurry prior to cementing;
- a suspending agent for maintaining the slurry with minimal separation of the cementitious material;
- an activating agent;
- an effective amount of water to form a pumpable slurry;
- wherein an effective amount of activating agent is added which is sufficient to overactivate the slurry and wherein an additional amount of set retarder is added to the slurry to achieve a setting time.
3 more elements
Dependencies are inferred from the claim text.