Porous cement composition for propping fractures open

Patent metadata

Field	Value
Publication number	US-2016237341-A1
Application number	US-201514621179-A
Country	US
Kind code	A1
Filing date	Feb 12, 2015
Priority date	Feb 12, 2015
Publication date	Aug 18, 2016
Grant date	—

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.

First claim

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.

9 . (canceled)

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.

11 .- 16 . (canceled)

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.

23 . (canceled)

24 . (canceled)

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.

Assignees

• Halliburton Energy Services Inc

Inventors

• Bhamidipati Venkata Satya Srikalyan
• Benoit Denise N
• Weaver Jimmie D
• Nguyen Philip D

Classifications

• E21B43/267

  reinforcing fractures by propping · CPC title

• C09K8/80 Primary

  Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open · CPC title

• C04B2103/42

  Pore formers · CPC title

• C09K8/473

  Density reducing additives, e.g. for obtaining foamed cement compositions · CPC title

• C09K8/467

  containing additives for specific purposes · CPC title