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US 6,173,778 B1Granted
Storable liquid systems for use in cementing oil and gas wells
AssigneeBJ Services Company
InventorsPhilip J. Rae, Neil Johnston, Gino DiLullo
Life of this patent
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Abstract
Storable cement slurries utilize a carrageenan suspending agent to provide stable slurries under conditions of high pH and calcium ion content. These cement slurries may be utilized for, among other things, cementing applications involving oil and gas wells.
Claims33
A storable cement slurry, comprising:
- an aqueous base fluid;
- a hydraulically-active cementious material;
- a set retarder;
- and
- an effective amount of iota carrageenan suspending agent.
2 more elements
A method of cementing a wellbore, comprising:
- introducing a storable cement slurry into said wellbore, said storable cement slurry comprising an aqueous base fluid, a hydraulically-active cementious material, a set retarder, and an effective amount of iota carrageenan suspending agent;
- allowing said slurry to set.
A method of cementing a wellbore, comprising:
- storing a storable cement slurry, said storable cement slurry comprising:
- an aqueous base fluid,
- a hydraulically-active cementious material, wherein said cementious material is at least one of Portland cement, slag or a mixture thereof,
- a set retarder, wherein said set retarder is at least one of hydroxycarboxylic acid, gluconic acid, glucoheptonate, lignin sulfonate, sodium gluconate, phosphonate, sugar, or a mixture thereof,
- a dispersant, wherein said dispersant is at least one of melamine sulfonic acid polymer, sodium polyacrylate, sodium salt of naphthalene sulfonate formaldehyde condensate, napthalene sulfonic acid polymer, sulfonated styrene maleic anhydride polymer, or a mixture thereof, and
- an effective amount of iota carrageenan suspending agent;
- introducing said slurry into said wellbore;
- and
- allowing said slurry to set.
6 more elements
Dependencies are inferred from the claim text.