Fracturing fluid composition and method utilizing same

Patent metadata

Field	Value
Publication number	US-9580641-B2
Application number	US-201314136767-A
Country	US
Kind code	B2
Filing date	Dec 20, 2013
Priority date	Dec 20, 2013
Publication date	Feb 28, 2017
Grant date	Feb 28, 2017

Abstract

The present disclosure is directed to a composition and method of fracturing a formation penetrated by a well-bore. The composition and method comprises providing a fracturing fluid that is liquefied carbon dioxide (LCO 2 ) with at least one friction reducing polymer that is a polysiloxane dissolved in the LCO 2 at a concentration of about 0.001 to 1.0 weight percent, and a first at least one co-solvent, and optionally a second at least one co-solvent that has a closed cup flash point greater than the first at least one co-solvent, in order to enable dissolution of the polymer in order to effect friction reduction.

First claim

We claim:

1. A fracturing fluid composition, comprising: (i) liquid carbon dioxide (LCO 2 ) in a quantity of at least 80 wt % of the fluid composition in combination with (ii) at least one friction-reducing polydimethylsiloxane polymer, having a molecular weight greater than 597,000 g/mol, and a kinematic viscosity greater than 20,000,000 cSt in a quantity of 0.001-1.0 wt % of the fracturing fluid composition, and (iii) at least one co-solvent in an amount of 1-19 wt % of the fracturing fluid composition, wherein said friction reducing polymer is soluble in the at least one co-solvent and LCO 2 mixture.

2. The fracturing fluid composition of claim 1 , wherein the polysiloxane is a polydimethylsiloxane having hydroxyl terminal groups.

3. The fracturing fluid composition of claim 1 , wherein said at least one co-solvent is a hydrocarbon, an oxy-hydrocarbon or a siloxane, or mixtures thereof.

4. The fracturing fluid composition of claim 3 , wherein said at least one co-solvent is toluene.

5. The fracturing fluid composition of claim 1 , wherein the at least one co-solvent is partially substituted with a second co-solvent having a closed cup flash point greater than 140° F., and where the total amount of co-solvent remains 1-19 wt % of the fluid composition.

6. The fracturing fluid composition of claim 5 , wherein said second at least one co-solvent is selected from one of the following categories:
i: A C 1 -C 4 monoalkyl ester of a C 8 to C 24 fatty carboxylic acid derived from a plant or animal triglyceride,
ii: An alkylene glycol derivative of the general structure:

iii A C 8 -C 18 aliphatic alcohol or the ester of these with a C 2 -C 4 carboxylic acid.

7. The fracturing fluid composition of claim 5 , wherein the second solvent is methyl oleate.

8. The fracturing fluid composition of claim 1 , wherein the balance of the fracturing fluid composition can include one or more of either surfactants or viscosity modifying agents in substitution for the carbon dioxide content to a maximum of 5 wt % of each component.

9. The fracturing fluid composition of claim 1 , further comprising proppant.

10. The fracturing fluid composition of claim 1 , comprising: (i) about 85-95 wt % liquid carbon dioxide (LCO 2 ) in combination with (ii) at least one friction-reducing polymer in a quantity of 0.05-0.5 wt % of the fracturing fluid composition, and (iii) at least one co-solvent in an amount of 4.5-14.95 wt % of the fracturing fluid composition, wherein said friction reducing polymer is soluble in the at least one co-solvent and LCO 2 mixture.

11. The fracturing fluid composition of claim 1 , comprising: (1) about 90 wt % liquid carbon dioxide, (2) about 0.2 wt % polydimethysiloxane friction-reducing polymer having a kinematic viscosity of greater than 120,000,000 cSt and (3) about 9.8 wt % naphtha co-solvent.

12. The fracturing fluid composition of claim 1 , comprising: (1) about 90 wt % liquid carbon dioxide, (2) about 0.1 wt % polydimethysiloxane friction-reducing polymer having a kinematic viscosity of greater than 120,000,000 cSt (3) a first naphtha co-solvent that is partially substituted with a methyl oleate second co-solvent, wherein the first co-solvent and second co-solvent are in an amount of about 0.9 wt % and 9.0 wt %, respectively in the fluid composition.

Assignees

• Praxair Technology Inc

Inventors

• Kelly Richard M
• Scharmach William J
• Renz Walter L

Classifications

• E21B43/2605 Primary

  using gas or liquefied gas · CPC title

• E21B43/164

  Injecting CO2 or carbonated water (in combination with organic material C09K8/594) · CPC title

• C01B32/50

  Carbon dioxide · CPC title

• C08L83/04

  Polysiloxanes · CPC title

• C09K8/92

  characterised by their form or by the form of their components, e.g. encapsulated material (C09K8/70 takes precedence) · CPC title