Cement compositions including epoxy resin systems for preventing fluid migration

Patent metadata

Field	Value
Publication number	US-11168243-B2
Application number	US-201816117974-A
Country	US
Kind code	B2
Filing date	Aug 30, 2018
Priority date	Aug 30, 2018
Publication date	Nov 9, 2021
Grant date	Nov 9, 2021

Abstract

A cement composition is disclosed that includes a cement slurry and an epoxy resin system that includes at least one epoxy resin and a curing agent. The cement slurry has a density in a range of from 65 pcf to 180 pcf and includes a cement precursor material, silica sand, silica flour, a weighting agent, and manganese tetraoxide. The epoxy resin system includes at least one of 2,3-epoxypropyl o-tolyl ether, alkyl glycidyl ethers having from 12 to 14 carbon atoms, bisphenol-A-epichlorohydrin epoxy resin, or a compound having formula (I): (OC2H3)—CH2—O—R1—O—CH2—(C2H3O) where R1 is a linear or branched hydrocarbyl having from 4 to 24 carbon atoms; and a curing agent.

First claim

What is claimed is:

1. A cement composition comprising:
a cement slurry having a density in a range of from 130 pounds per cubic foot (pcf) to 180 pcf, the slurry comprising:
Portland Cement,
silica sand in an amount of from 10% to 20% by weight of cement,
silica flour in an amount of from 5% to 30% by weight of cement,
hematite in an amount of from 30% to 50% by weight of cement, and
manganese tetraoxide in an amount of from 30% to 50% by weight of cement; and

an epoxy resin system, the epoxy resin system comprising:
from 50 weight percent to 97 weight percent 2,3-epoxypropyl o-tolyl ether based on the weight of the epoxy resin system; and
from 2 weight percent to 30 weight percent of a curing agent based on the weight of the epoxy resin system.

2. The cement composition of claim 1 , where the epoxy resin system has a viscosity of from 1 millipascal seconds (mPa·s) to 50,000 mPa·s.

3. The cement composition of claim 1 , where the gel strength of the cement composition has a value greater than or equal to 1 when measured at room temperature and at a speed of 3 rotations per minute (rpm) using the method provided in the API Recommended Practice For Cementing (RP 10B).

4. The cement composition of claim 1 , where the cement composition has a gel strength greater than or equal to 1 using the method provided in the API Recommended Practice for Cementing.

5. The cement composition of claim 1 , where the cement composition has a density in a range of from 65 pcf to 180 pcf.

6. The cement composition of claim 1 , where the curing agent comprises an aliphatic amine curing agent.

7. The cement composition of claim 1 , where the curing agent comprises an aromatic amine curing agent.

8. The cement composition of claim 1 , further comprising an accelerator.

9. The cement composition of claim 1 , where the epoxy resin system further comprises a reactive diluent.

10. The cement composition of claim 1 , where the epoxy resin system further comprises multiple curing agents.

11. The cement composition of claim 1 , where the cement composition has a cure time of less than or equal to 48 hours.

12. The cement composition of claim 1 , comprising from 1 wt. % to 10 wt. % epoxy resin system based on the weight of the cement composition.

13. A method comprising
introducing a cement composition into a lost circulation zone or an annulus, the cement composition comprising:
a cement slurry having a density in a range of from 130 pounds per cubic foot (pcf) to 180 pcf, the cement slurry comprising:
Portland Cement,
silica sand in an amount of from 10% to 20% by weight of cement,
silica flour in an amount of from 5% to 30% by weight of cement,
hematite in an amount of from 30% to 50% by weight of cement, and
manganese tetraoxide in an amount of from 30% to 50% by weight of cement; and

an epoxy resin system comprising:
from 50 weight percent to 97 weight percent 2,3-epoxypropyl o-tolyl ether based on the weight of the epoxy resin system; and
from 2 weight percent to 30 weight percent of a curing agent based on the weight of the epoxy resin system; and

curing the cement composition to form a cured cement composition, where the cured cement composition seals the lost circulation zone or the annulus.

14. The method of claim 13 , where introducing the cement composition to the lost circulation zone comprises injecting the cement composition into the lost circulation zone.

15. The method of claim 13 , where the lost circulation zone is a narrow fracture gradient zone.

16. The method of claim 13 , further comprising drilling through the cured cement composition sealing the lost circulation zone to continue drilling the wellbore.

17. The method of claim 13 , where a spacer fluid, the cement composition, or both are introduced to the lost circulation zone through a drill string disposed within the wellbore.

18. The method of claim 13 , further comprising introducing a displacement fluid after the cement composition to displace the cement composition into lost circulation zone.

19. The method of claim 13 , where the cement composition has a cure time of less than or equal to 48 hours.

Assignees

• Saudi Arabian Oil Co

Inventors

• Al-Yami Abdullah
• Wagle Vikrant
• Alsaihati Zainab
• Mukherjee Tushar
• Binali Ali
• Alqahtani Ali

Classifications

• C09K8/426

  for plugging · CPC title

• C09K8/493

  Additives for reducing or preventing gas migration · CPC title

• C09K8/473 Primary

  Density reducing additives, e.g. for obtaining foamed cement compositions · CPC title

• C09K8/467 Primary

  containing additives for specific purposes · CPC title

• E21B33/138

  Plastering the borehole wall; Injecting into the formation · CPC title