Lignosulfonate and hydrolyzed carbohydrate retarder additive for cement mixture

Patent metadata

Field	Value
Publication number	US-11535557-B2
Application number	US-202117231569-A
Country	US
Kind code	B2
Filing date	Apr 15, 2021
Priority date	Apr 15, 2021
Publication date	Dec 27, 2022
Grant date	Dec 27, 2022

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.

First claim

What is claimed is:

1. 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.

2. The retarder mixture of claim 1 , wherein the lignosulfonate compound is sodium lignosulfonate.

3. The retarder mixture of claim 1 , wherein the at least one hydrolyzed carbohydrate is selected from the group consisting of glucose, fructose, galactose, and xylose.

4. The retarder mixture of claim 1 , wherein retarder mixture comprises the lignosulfonate compound in an amount ranging from 10% to 30% based on weight.

5. The retarder mixture of claim 1 , wherein retarder mixture comprises the at least one hydrolyzed carbohydrate in an amount ranging from 68% to 90% based on weight.

6. The retarder mixture of claim 1 , wherein a ratio of the lignosulfonate compound to the at least one hydrolyzed carbohydrate ranges from 0.1 to 0.45.

7. The retarder mixture of claim 1 , having an alkali content ranging from 0 g to 4.5 g of Na 2 O equivalent/liter of the retarder mixture.

8. The retarder mixture of claim 1 , wherein the retarder mixture comprises unsaturated compounds.

9. The retarder mixture of claim 1 , wherein the retarder mixture has a weight loss of less than 50% when heated from 0° C. to 400° C.

10. A cement mixture comprising:
a cement precursor;
the retarder mixture of claim 1 ; and
water.

11. The cement mixture of claim 10 , wherein the cement mixture has an amount of the retarder mixture ranging from 0.2 liters to 0.6 liters per 100 kg the cement mixture.

12. The cement mixture of claim 10 , wherein the cement mixture has a thickening time ranging from 4 hours to 20 hours at 52° C.

13. The cement mixture of claim 10 having a slump ranging from 20 mm to 150 mm.

14. 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.

15. The method of claim 14 , wherein the lignosulfonate compound is sodium lignosulfonate.

16. The method of claim 14 , wherein the at least one hydrolyzed carbohydrate is selected from glucose, fructose, galactose, and xylose.

17. The method of claim 14 , further comprising introducing the cement mixture into a wellbore to a downhole location having temperatures of at least 125° C.

18. The method of claim 17 , further comprising applying and maintaining a pressure on the cement mixture until the cement mixture cures to form a cement sheath.

19. 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.

20. The well of claim 19 , wherein the cured cement sheath is formed in an area of the formation having a temperature of greater than 125° C.

Assignees

• Saudi Arabian Oil Co

Inventors

• Alkhalaf Sara Abdulaziz
• Al-Yami Abdullah
• Wagle Vikrant
• Alsafran Ali

Classifications

• C04B2103/22

  Set retarders · CPC title

• C04B7/02

  Portland cement · CPC title

• C04B24/18 Primary

  Lignin sulfonic acid or derivatives thereof, e.g. sulfite lye · CPC title

• C04B2103/24

  Hardening retarders · CPC title

• C09K8/467 Primary

  containing additives for specific purposes · CPC title