Y-grade NGL stimulation fluids

Patent metadata

Field	Value
Publication number	US-9725644-B2
Application number	US-201514878196-A
Country	US
Kind code	B2
Filing date	Oct 8, 2015
Priority date	Oct 22, 2014
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

Y-Grade NGL fracturing systems and methods of using Y-Grade NGL stimulation fluids.

First claim

The invention claimed is:

1. A stimulation fluid system, comprising:
a nitrogen and/or carbon dioxide source;
a fluid source in fluid communication with the nitrogen and/or carbon dioxide source;
a proppant source in fluid communication with the nitrogen and/or carbon dioxide source;
a receiver-blender in fluid communication with the fluid source and the proppant source; and
a pump configured to pump a stimulation fluid from the receiver-blender into a wellhead, wherein the stimulation fluid comprises a proppant from the proppant source, an unfractionated hydrocarbon mixture from the fluid source, and at least one of nitrogen and carbon dioxide from the nitrogen and/or carbon dioxide source, wherein the unfractionated hydrocarbon mixture is a byproduct of a de-methanized hydrocarbon stream, and wherein the unfractionated hydrocarbon mixture comprises ethane, propane, butane, isobutane, and pentane plus.

2. The system of claim 1 , further comprising a foaming agent source and a foaming unit in fluid communication with the fluid source and the receiver-blender, wherein the foaming agent source comprises a foaming agent that includes at least one of a surfactant, a, co-surfactant, and a co-solvent.

3. The system of claim 1 , wherein the foaming unit includes a venturi eductor, a high frequency ultrasonic sonde, and/or a micro mesh screen.

4. The system of claim 1 , further comprising a gelling agent source in fluid communication with the receiver-blender, wherein the gelling agent source comprises a gelling agent that includes phosphate esters and organo-metallic complex cross-linkers.

5. The system of claim 1 , further comprising an emulsifying agent source in fluid communication with the receiver-blender, wherein the emulsifying agent source comprises an emulsifying agent.

6. The system of claim 1 , further comprising a pressure regulation compressor configured to regulate pressure within the receiver-blender.

7. The system of claim 1 , further comprising a field separation unit configured to receive a wet gas stream from the same or a different wellhead, separate the unfractionated hydrocarbon mixture from the wet gas stream, and supply the unfractionated hydrocarbon mixture to the fluid source directly via a fluid line or storage tankers.

8. The system of claim 1 , further comprising air separation equipment configured to separate nitrogen from air and supply nitrogen to the nitrogen source.

9. The system of claim 1 , further comprising of onsite pressurized storage vessels filled with additional amounts of the unfractionated hydrocarbon mixture supplied from a regional gathering pipeline, a regional gas splitter, or a gas processing facility via tanker trucks.

10. The system of claim 1 , wherein the proppant source comprises a pressurized proppant silo where the proppant is temporally stored and pneumatically conveyed to the receiver-blender using nitrogen or carbon dioxide.

11. A method of pumping a stimulation fluid into a hydrocarbon bearing reservoir, comprising:
blending an unfractionated hydrocarbon mixture, a proppant, and at least one of nitrogen and carbon dioxide in a receiver-blender to form the stimulation fluid, wherein the unfractionated hydrocarbon mixture is a byproduct of a de-methanized hydrocarbon stream, and wherein the unfractionated hydrocarbon mixture comprises ethane, propane, butane, isobutane, and pentane plus; and
pumping the stimulation fluid into the hydrocarbon bearing reservoir.

12. The method of claim 11 , further comprising blending a foaming agent and optionally a foam stabilizer with the unfractionated hydrocarbon mixture, the proppant, and at least one of nitrogen and carbon dioxide in the receiver-blender to form the stimulation fluid, wherein the foaming agent includes at least one of a surfactant, a co-surfactant, and a co-solvent, and optionally includes a foam stabilizer.

13. The method of claim 11 , further comprising blending a gelling agent with the unfractionated hydrocarbon mixture, the proppant, and at least one of nitrogen and carbon dioxide in the receiver-blender to form the stimulation fluid, wherein the gelling agent includes phosphate esters and organo-metallic complex cross-linkers.

14. The method of claim 11 , further comprising blending an emulsifying agent and water or brine with the unfractionated hydrocarbon mixture, the proppant, and at least one of nitrogen and carbon dioxide in the receiver-blender to form the stimulation fluid.

15. The method of claim 11 , further comprising acquiring the unfractionated hydrocarbon mixture from a wet gas stream, a fluid line, or storage tankers, and supplying the unfractionated hydrocarbon mixture to a fluid source that is in fluid communication with the receiver-blender.

16. The method of claim 11 , wherein the stimulation fluid includes a nitrogen concentration greater than 50%, a carbon dioxide concentration greater than 35%, or a combination of nitrogen and carbon dioxide concentration greater than 50% so that the stimulation fluid is outside the flammability limit.

Assignees

• Linde Ag
• Babcock John A

Inventors

• Babcock John A
• Guzmann Marcus

Classifications

• C09K8/82 Primary

  Oil-based compositions (C09K8/64 takes precedence) · CPC title

• C09K8/602 Primary

  containing surfactants · CPC title

• C09K8/703

  Foams · CPC title

• E21B43/164

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

• C09K8/685

  containing cross-linking agents · CPC title