POROUS CEMENT COMPOSITION FOR PROPPING FRACTURES OPEN

• US 20160237341A1
• Filed: 02/12/2015
• Published: 08/18/2016
• Est. Priority Date: 02/12/2015
• Status: Active Grant

• Current Assignee: Halliburton Energy Services Incorporated (Halliburton Company)
• Original Assignee: Halliburton Energy Services Incorporated (Halliburton Company)
• Inventors: BHAMIDIPATI, Venkata Satya Srikalyan, BENOIT, Denise N., WEAVER, Jimmie D., NGUYEN, Philip D.
• Granted Patent: US 10,011,764 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: C04B 2103/0071 Phase-change materials, e.g. latent heat storage materials used in concrete compositions
• CPC Class Codes: C04B 2103/0094 Agents for altering or buffering the pH; Ingredients characterised by their pH
• CPC Class Codes: C04B 2103/42 Pore formers
• CPC Class Codes: C04B 22/0013 Boron compounds
• CPC Class Codes: C04B 22/068 Peroxides, e.g. hydrogen peroxide
• CPC Class Codes: C04B 24/06 containing hydroxy groups
• CPC Class Codes: C04B 24/10 Carbohydrates or derivatives thereof
• CPC Class Codes: C04B 24/12 Nitrogen containing compounds organic derivatives of hydrazine hydrazine C04B22/00
• CPC Class Codes: C04B 24/36 Bituminous materials, e.g. tar, pitch C04B24/243 takes precedence
• CPC Class Codes: C04B 28/04 Portland cements
• CPC Class Codes: C04B 38/02 by adding chemical blowing agents
• CPC Class Codes: C09K 8/467 containing additives for specific purposes
• CPC Class Codes: C09K 8/473 Density reducing additives, e.g. for obtaining foamed cement compositions
• CPC Class Codes: C09K 8/80 Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open
• CPC Class Codes: E21B 43/267 reinforcing fractures by propping

Abstract

A method of fracturing a subterranean formation comprising: introducing a fracturing fluid into the subterranean formation to create or enhance one or more fractures in the subterranean formation; introducing a cement composition into the one or more fractures, wherein the cement composition comprises: (A) cement; (B) water; and (C) an additive; and allowing the cement composition to set, wherein the additive creates a plurality of pores within the set cement.

Claims

1. A method of fracturing a subterranean formation comprising:

introducing a fracturing fluid into the subterranean formation to create or enhance one or more fractures in the subterranean formation;

introducing a cooling fluid into the subterranean formation, wherein the cooling fluid decreases the temperature of at least a portion of the subterranean formation, wherein the cooling fluid is selected from the group consisting of the fracturing fluid, drilling fluids, injection fluids, work-over fluids, acidizing fluids, gravel packing fluids, completion fluids, stimulation fluids, and combinations thereof;

then introducing a cement composition into the one or more fractures, wherein the cement composition comprises;

(A) cement;

(B) water; and

(C) an additive, wherein the additive is selected from the group consisting of a compound that undergoes a phase transition, a gas-generating compound, and combinations thereof; and

then allowing the cement composition to set, wherein the additive creates a plurality of pores within the set cement.

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 a thixotropic cement.

4. 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.

5. 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.

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

7. The method according to claim 1, wherein the additive undergoes the phase transition at the bottomhole temperature of the subterranean formation.

8. The method according to claim 1, wherein the compound that undergoes the phase transition is a wax, thermoplastic, sugar, salt, eutectic composition, or a hypo- or hyper-eutectic composition.

10. The method according to claim 1, further comprising discontinuing the introduction of the cooling fluid into the subterranean formation such that the bottomhole temperature of the subterranean formation increases to a temperature greater than or equal to the phase transition temperature of the compound.

17. The method according to claim 1, wherein the additive comprises the gas-generating compound, and wherein the gas is generated during the setting of the cement composition.

18. The method according to claim 1, wherein the additive comprises the gas-generating compound and wherein the gas-generating compound is selected from the group consisting of:

compounds comprising hydrazine or azo groups, including hydrazine, azodicarbonamide, azobis(isobutyronitrile), p-toluene sulfonyl hydrazide, p-toluene sulfonyl semicarbazide, carbohydrazide, p,p′

-oxybis(benzenesulfonyl hydrazide);

nitrogen generating compounds, including ammonium salts of organic or inorganic acids, hydroxylamide sulfate, carbamide; and

combinations thereof.

19. The method according to claim 17, wherein the amount of gas produced by the gas-generating compound is in the range of 40% to 60% by volume of the cement composition.

20. The method according to claim 1, wherein the additive is in a concentration of about 5% to about 60% by weight of the cement.

21. The method according to claim 1, wherein a percentage of the pores are interconnected thereby providing a desired amount of permeability to the set cement composition.

22. The method according to claim 1, wherein the step of introducing comprises pumping the fracturing fluid into the subterranean formation using a pump.

25. The method according to claim 1, wherein the cooling fluid cools the bottomhole temperature of the portion of the subterranean formation by over 100°

F.

26. The method according to claim 1, wherein the cooling fluid cools the bottomhole temperature of the portion of the subterranean formation to within 10°

F. of the surface temperature of the cement composition.

27. The method according to claim 10, wherein the discontinuing the introduction of the cooling fluid is performed subsequent to the allowing the cement composition to set.

28. The method according to claim 10, wherein the discontinuing the introduction of the cooling fluid further comprises removing at least a portion of the cooling fluid from the subterranean formation.

9. (canceled)

11-16. -16. (canceled)

23. (canceled)

24. (canceled)