Acid-soluble cement composition

Patent metadata

Field	Value
Publication number	US-10059870-B2
Application number	US-201415524465-A
Country	US
Kind code	B2
Filing date	Dec 2, 2014
Priority date	Dec 2, 2014
Publication date	Aug 28, 2018
Grant date	Aug 28, 2018

Abstract

A cement composition for use in a well that penetrates a subterranean formation comprising: cement; and water, wherein the water is in a concentration in the range of about 220% to about 800% by weight of the cement, wherein the cement composition is acid soluble. A method of treating a subterranean formation comprising: introducing the cement composition into the subterranean formation; allowing the composition to set; and contacting the set cement composition with an acid.

First claim

What is claimed is:

1. A method of treating a subterranean formation comprising:
introducing a cement composition into the subterranean formation, wherein the cement composition comprises:
(A) cement; and
(B) water, wherein the water is in a concentration in the range of about 220% to about 800% by weight of the cement thereby yielding a cement composition comprising a density of between about 9 ppg to about 12 ppg without the inclusion of light-weight additives;
wherein the cement composition is acid soluble;

allowing the composition to set; and
contacting the set cement composition with an acid.

2. The method according to claim 1 , wherein the cement is selected from the group consisting of Class A cement, Class C cement, Class G cement, Class H cement, and any combination thereof.

3. The method according to claim 1 , wherein the cement is selected from the group consisting of Portland cement, Gypsum cement, Joppa cement, Dyckerhoff cement, Slag, cement, high aluminate cements, such as calcium-aluminate cements, calcium magnesia cements, and any combination thereof.

4. The method according to claim 1 , wherein the water is selected from the group consisting of freshwater, brackish water, seawater, and saltwater, in any combination thereof in any proportion.

5. The method according to claim 1 , wherein the cement composition further comprises a water-soluble salt.

6. The method according to claim 1 , wherein the cement composition has a percent acid solubility greater than 45% at a time of 60 minutes in a 15% hydrochloric acid solution.

7. The method according to claim 1 , wherein the cement composition has a percent acid solubility greater than 60% at a time of 120 minutes in a 15% hydrochloric acid solution.

8. The method according to claim 1 , wherein the percentage of acid solubility of the set cement composition is at least 50% at the bottomhole temperature and pressure of the subterranean formation after being contacted with the acid for 180 minutes.

9. The method according to claim 1 , wherein the acid dissolves at least the cement of the cement composition.

10. The method according to claim 9 , wherein the acid is selected from hydrochloric acid, phosphoric acid, and hydrofluoric acid.

11. The method according to claim 1 , wherein the cement composition inhibits or prevents lost circulation into the subterranean formation.

12. The method according to claim 1 , wherein the step of introducing comprises introducing the cement composition into one or more vugs or fissures within the subterranean formation.

13. The method according to claim 1 , wherein the acid contacts the set cement composition for a desired amount of time, and wherein the desired amount of time is sufficient to cause a desired percentage of the set cement composition to dissolve in the acid.

14. The method according to claim 13 , wherein the desired percentage is selected such that fluid communication is restored within the subterranean formation.

15. The method according to claim 1 , wherein the subterranean formation is penetrated by a well.

16. The method according to claim 15 , wherein the well is an oil, gas, or water production well, an injection well, a geothermal well, or a high-temperature and high-pressure well.

17. The method according to claim 1 , wherein the step of introducing comprises using one or more pumps to pump the cement composition into the subterranean formation.

18. A cement composition for use in a well that penetrates a subterranean formation comprising:
cement; and
water, wherein the water is in a concentration in the range of about 220% to about 800% by weight of the cement thereby yielding a cement composition comprising a density of between about 9 ppg to about 12 ppg without the inclusion of light-weight additives, and wherein the cement composition is acid soluble.

Assignees

• Halliburton Energy Services Inc

Inventors

• Joseph Trissa
• Ravi Krishna
• Patil Sandip Prabhakar
• Patil Rahul Chandrakant

Classifications

• E21B33/16

  using plugs for isolating cement charge; Plugs therefor {(stage cementing E21B33/146; spacer compositions C09K8/424)} · CPC title

• E21B21/003

  Means for stopping loss of drilling fluid (plastering the borehole wall E21B33/138) · CPC title

• C04B40/0092 Primary

  Temporary binders, mortars or concrete, i.e. materials intended to be destroyed or removed after hardening, e.g. by acid dissolution · CPC title

• C09K8/5045 Primary

  containing inorganic compounds · CPC title

• C09K8/46 Primary

  containing inorganic binders, e.g. Portland cement · CPC title