Acid-soluble cement composition

Patent metadata

Field	Value
Publication number	US-2017321107-A1
Application number	US-201415524465-A
Country	US
Kind code	A1
Filing date	Dec 2, 2014
Priority date	Dec 2, 2014
Publication date	Nov 9, 2017
Grant date	—

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
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 cement composition has a density in the range of about 9 to about 12 pounds per gallon.

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

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

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

13 . 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.

14 . 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.

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

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

17 . The method according to claim 16 , 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.

18 . 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.

19 . 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, 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

• 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

• E21B33/138

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

• E21B29/02

  by explosives or by thermal or chemical means {(freeing stuck objects by explosives E21B31/002)} · CPC title

• C04B28/04

  Portland cements · CPC title