Lime-based cement composition

Patent metadata

Field	Value
Publication number	US-2017321104-A1
Application number	US-201415524468-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: hydrated lime; a silicate; and water, wherein the composition is substantially free of a hydraulic cement. A method of treating a subterranean formation comprising: introducing the cement composition into the subterranean formation; and allowing the cement composition to set.

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) hydrated lime;
(B) a silicate; and
(C) water,
wherein the cement composition is substantially free of a hydraulic cement; and
allowing the composition to set.

2 . The method according to claim 1 , wherein the silicate includes a cation selected from the group consisting of calcium, sodium, or potassium.

3 . The method according to claim 2 , wherein the silicate is sodium silicate.

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

5 . The method according to claim 1 , wherein the hydrated lime and at least the silicate react in the presence of water to form a calcium silicate hydrate gel.

6 . The method according to claim 5 , wherein the cement composition becomes a gel after the hydrated lime and the silicate are mixed with the water.

7 . The method according to claim 1 , wherein the cement composition develops a 10 minute gel strength of at least 20 lb/ft 2 at a temperature of 80° F.

8 . The method according to claim 1 , wherein the cement composition develops a 10 minute gel strength of at least 30 lb/ft 2 at a temperature of 80° F.

9 . The method according to claim 1 , wherein the silicate is in a concentration such that the cement composition develops a 10 minute gel strength of at least 20 lb/ft 2 at a temperature of 80° F.

10 . The method according to claim 1 , wherein the silicate is in a concentration in the range of about 0.5% to about 15% by weight of the hydrated lime.

11 . The method according to claim 1 , wherein the cement composition has a density in the range of about 9 to about 22 pounds per gallon.

12 . The method according to claim 1 , wherein the cement composition has a thickening time in the range of about 2 to about 15 hours at a temperature of 80° F.

13 . The method according to claim 1 , wherein the cement composition develops a compressive strength greater than 50 psi at a temperature of 120° F., a pressure of 3,000 psi, and a time of 24 hours.

14 . The method according to claim 1 , wherein the cement composition further comprises amorphous silica.

15 . The method according to claim 14 , wherein the silica is in a concentration in the range of about 1% to about 150° by weight of the hydrated lime.

16 . The method according to claim 1 , wherein the cement composition further comprises a clay.

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

18 . The method according to claim 17 , 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.

19 . 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.

20 . A cement composition for use in a well that penetrates a subterranean formation comprising:
hydrated lime; a silicate; and water, wherein the composition is substantially free of a hydraulic cement.

Assignees

• Halliburton Energy Services Inc

Inventors

• Ravi Krishna
• Patil Sandip Prabhakar
• Singh Sheetal
• Patil Rahul Chandrakant

Classifications

• E21B21/003

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

• E21B33/138

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

• C04B28/18 Primary

  containing mixtures of the silica-lime type · CPC title

• C04B2111/1037

  Cement free compositions, e.g. hydraulically hardening mixtures based on waste materials, not containing cement as such · CPC title

• C09K8/46 Primary

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