Self-healing durable cement

Patent metadata

Field	Value
Publication number	US-10655045-B2
Application number	US-201916582467-A
Country	US
Kind code	B2
Filing date	Sep 25, 2019
Priority date	Apr 27, 2018
Publication date	May 19, 2020
Grant date	May 19, 2020

Abstract

According to at least one embodiment of the present description, a cement slurry includes 1% to 90% BWOC of a cement precursor material based on the total weight of the cement slurry; and from 1% to 40% BWOC of a swelling additive based on the total weight of the cement slurry. The swelling additive comprises at least one micronized rubber, at least one distillate, and at least one solvent-refined heavy paraffinic.

First claim

What is claimed is:

1. A wellbore cementing system comprising:
a tubular positioned in a wellbore such that an annulus is formed between a geological formation and the tubular; and
a cement structure positioned in at least a portion of the annulus, where
the cement structure comprises:
from 1% to 90% by weight of the cement of a cement precursor material based on a total weight of the cement structure, and
from 1% to 40% by weight of the cement of a swelling additive based on the total weight of the cement structure, where the swelling additive comprises (a) at least one micronized rubber in an amount from 50.0% to 95.0% by weight of the cement, and (b) comprises a combination of at least one distillate and at least one solvent-refined heavy paraffinic in an amount from 5.0% to 15.0% by weight of the cement.

2. The wellbore cementing system of claim 1 , where the at least one micronized rubber comprises nitrile rubber, styrene butadiene, fluoro silicone, isobutylene maleic anhydride, acrylic acid-type polymers, polyethylene oxide polymers, bentonite, and mixtures of these components.

3. The wellbore cementing system of claim 1 , where the at least one micronized rubber has a density from 10.0 lb/gal to 20.5 lb/gal.

4. The wellbore cementing system of claim 1 , where the at least one micronized rubber has a specific gravity from 0.85 to 1.10.

5. The wellbore cementing system of claim 1 , where the at least one micronized rubber comprises a mixture of carbon black, zinc oxide, and an elastomer.

6. The wellbore cementing system of claim 5 , where the carbon black comprises from 10.0% to 40.0% by weight of the cement of the at least one micronized rubber, the zinc oxide comprises less than 3.0% by weight of the cement of the at least one micronized rubber, and the elastomer comprises from 60.0% to 80.0% by weight of the cement of the at least one micronized rubber.

7. The wellbore cementing system of claim 1 , where the at least one micronized rubber comprises a mixture of acrylonitrile rubber, zinc oxide, and styrene butadiene copolymer.

8. The wellbore cementing system of claim 7 , where the acrylonitrile rubber comprises from 25.0% to 50.0% by weight of the cement of the at least one micronized rubber, the zinc oxide comprises less than 2.5% by weight of the cement of the micronized rubber, and the styrene butadiene copolymer comprises from 50.0% to 70.0% by weight of the cement of the micronized rubber.

9. The wellbore cementing system of claim 1 , where the swelling additive has a density from 0.5 g/cm 3 to 2.0 g/cm 3 .

10. The wellbore cementing system of claim 1 , where the cement structure has a Young's modulus 10 days after curing from 7.50×10 5 psi to 7.95×10 5 psi.

11. The wellbore cementing system of claim 1 , where the cement structure has a Young's modulus 20 days after curing from 5.50×10 5 psi to 6.00×10 5 psi.

12. The wellbore cementing system of claim 1 , where the cement structure has a Young's modulus 30 days after curing from 7.00×10 5 psi to 7.50×10 5 psi.

13. The wellbore cementing system of claim 1 , where the cement structure has a Poisson's ratio 10 days after curing from 0.370 psi to 0.400 psi.

14. The wellbore cementing system of claim 1 , where the cement structure has a Poisson's ratio 20 days after curing from 0.330 psi to 0.360 psi.

15. The wellbore cementing system of claim 1 , where the cement structure has a Poisson's ratio 30 days after curing from 0.705 psi to 0.735 psi.

16. The wellbore cementing system of claim 1 , where the cement structure has a density from 100 pcf to 170 pcf.

Assignees

• Saudi Arabian Oil Co

Inventors

• Al-Yami Abdullah
• Wagle Vikrant
• Albahrani Hussain
• Alsaihati Zainab
• Santagati Antonio
• Al-Alqam Mohammad
• Alsafran Ali
• Alhelal Abdulaziz
• Alhareth Nasser
• Al-Awadh Abdullah

Classifications

• C04B28/02 Primary

  containing hydraulic cements other than calcium sulfates · CPC title

• C04B40/0675

  Mortars activated by rain, percolating or sucked-up water; Self-healing mortars or concrete · CPC title

• C09K8/44 Primary

  containing organic binders only · CPC title

• C09K8/467

  containing additives for specific purposes · CPC title

• E21B33/14

  for cementing casings into boreholes · CPC title