Cementitious compositions comprising a non-aqueous fluid and an alkali-activated material

Patent metadata

Field	Value
Publication number	US-9957434-B2
Application number	US-201615355586-A
Country	US
Kind code	B2
Filing date	Nov 18, 2016
Priority date	Nov 18, 2015
Publication date	May 1, 2018
Grant date	May 1, 2018

Abstract

Provided herein are cementitious compositions comprising a non-aqueous fluid and an alkali-activated material. The non-aqueous fluid can include a natural oil, a synthetically derived oil, one or more surfactants, or a combination thereof. In some embodiments, the non-aqueous fluid can include an oil based mud, a synthetic based mud, or a mixture thereof. The alkali-activated material in the cementitious composition can be derived from an aluminosilicate material and an alkaline activator. In some embodiments, the aluminosilicate material includes fly ash. The alkaline activator can be selected from an alkali-hydroxide, an alkali-silicate, an alkali carbonate, an alkali bicarbonate, an alkali sulfate, and a mixture thereof. Provided herein are also wellbore servicing composition, such as compositions to reduce lost circulation of drilling fluids or cement a casing into the borehole, comprising the cementitious compositions and methods for preparing and using the cementitious compositions.

First claim

What is claimed is:

1. A cementitious composition, comprising: a cement, wherein the cement is formed from reaction of an aluminosilicate-based alkali-activated material and an alkaline activator selected from an alkali-hydroxide, an alkali-silicate, an alkali carbonate, an alkali bicarbonate, an alkali sulfate, and a mixture thereof in the presence of a non-aqueous fluid.

2. The cementitious composition of claim 1 , wherein the non-aqueous fluid includes a natural oil, a synthetically derived oil, one or more surfactants, or a combination thereof.

3. The cementitious composition of claim 1 , wherein the non-aqueous fluid is an oil based mud, a synthetic based mud, or a combination thereof.

4. The cementitious composition of claim 1 , wherein the non-aqueous fluid is present in an amount of from about 0.1 to about 60% by volume, based on the total volume of the cementitious composition.

5. The cementitious composition of claim 1 , wherein the aluminosilicate-based alkali-activated material is derived from fly ash, bottom ash, a paper ash, a basaltic rock, an andesitic rock, a feldspar, an aluminosilicate clay, a bauxite, an obsidian, a volcanic rock, a volcanic glass, a slag, an industrial incineration ash, a sludge, a soil, a waste material, a pozzolanic material, or a combination thereof.

6. The cementitious composition of claim 1 , wherein the alkaline activator comprises a cation selected from sodium, potassium, lithium, cesium, rubidium, and a combination thereof.

7. The cementitious composition of claim 1 , wherein the aluminosilicate-based alkali-activated material is present in an amount of from about 40% to about 99.9% by volume, based on the total volume of the cementitious composition.

8. The cementitious composition of claim 1 , wherein the composition further comprises a silica nanoparticle, silica fume, a dispersant, a surfactant, an aggregate, an accelerator, a retarder, a fluid loss additive, or a combination thereof.

9. The cementitious composition of claim 1 , wherein the composition has a compressive strength of from about 50 psi to about 20,000 psi.

10. A wellbore servicing composition comprising the cementitious composition of claim 1 .

11. The wellbore servicing composition of claim 10 , wherein the wellbore servicing composition comprises 60% or less by volume, of the non-aqueous fluid.

12. The wellbore servicing composition of claim 10 , wherein the wellbore servicing composition retains at least 50% compressive strength, compared to the compressive strength of the alkali-activated material alone.

13. The cementitious composition of claim 1 , wherein the composition does not include a surfactant.

14. A method for preparing a cementitious composition, comprising:
mixing an aluminosilicate material, an alkaline activator selected from an alkali-hydroxide, an alkali-silicate, an alkali carbonate, an alkali bicarbonate, an alkali sulfate, and a mixture thereof, and a non-aqueous fluid to form the cementitious composition.

15. The method of claim 14 , wherein the cementitious composition has a viscosity of 1000 cp or less.

16. The method of claim 14 , wherein the method does not include adding a surfactant.

17. A method for solidifying a drilling fluid in a borehole, comprising:
a. mixing an aluminosilicate material, an alkaline activator selected from an alkali-hydroxide, an alkali-silicate, an alkali carbonate, an alkali bicarbonate, an alkali sulfate, or a mixture thereof, and an organic based drilling fluid to form a slurry;
b. displacing the slurry to a preselected location in the borehole; and
c. allowing the slurry to solidify in-situ by reaction of the aluminosilicate material and the alkaline activator.

18. The method of claim 17 , wherein the slurry is solidified at an elevated temperature.

19. The method of claim 17 , wherein the slurry comprises 60% or less by volume, of the organic based drilling fluid.

20. The method of claim 17 , wherein the method does not include preflushing the borehole.

21. The method of claim 17 , wherein the method reduces lost circulation of drilling fluids, cement a casing into the borehole, or a combination thereof.

22. The method of claim 17 , wherein the method does not include adding a surfactant.

Assignees

• Univ Texas

Inventors

• Van Oort Eric
• Aughenbaugh Katherine Louise
• Nair Sriramya Duddukuri
• Liu Xiangyu

Classifications

• C04B2103/0093

  Organic cosolvents · CPC title

• C09K8/487

  Fluid loss control additives; Additives for reducing or preventing circulation loss · CPC title

• C04B28/08

  Slag cements · CPC title

• E21B21/003

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

• C04B18/141

  Slags · CPC title