Back to results
US 11,535,557 B2Granted
Lignosulfonate and hydrolyzed carbohydrate retarder additive for cement mixture
AssigneeSaudi Arabian Oil Company
InventorsSara Abdulaziz Alkhalaf, Abdullah Al-Yami, Vikrant Wagle, Ali Alsafran
Life of this patent
Estimating the term…
Abstract
A retarder mixture for oil and gas well cementing includes a lignosulfonate compound and at least one hydrolyzed carbohydrate. A method includes blending the retarder mixture and a cement precursor to form a cement precursor mixture and introducing water into the cement precursor mixture to form a cement mixture. The cement mixture is pumped down a well and cures to form a cement sheath containing the cement precursor and the retarder mixture.
Claims20
A retarder mixture for oil and gas well cementing, the retarder mixture comprising:
- a lignosulfonate compound;
- and
- at least one hydrolyzed carbohydrate,
- wherein the retarder mixture contains an isolated sulfur group and a methoxy group.
1 more element
A method, comprising:
- blending a retarder mixture and a cement precursor to form a cement precursor mixture;
- wherein the retarder mixture comprises a lignosulfonate compound and at least one hydrolyzed carbohydrate;
- introducing water into the cement precursor mixture to form a cement mixture,
- wherein the retarder mixture contains an isolated sulfur group and a methoxy group.
1 more element
A well, comprising:
- a borehole extending a distance into a formation;
- a casing extending into the borehole;
- and
- a cured cement sheath disposed between the casing and the formation, wherein the cured cement sheath comprises:
- a cement precursor;
- and
- a retarder mixture comprising a lignosulfonate compound and at least one hydrolyzed carbohydrate,
- wherein the retarder mixture contains an isolated sulfur group and a methoxy group.
5 more elements
Dependencies are inferred from the claim text.