Hydraulic fracturing composition, method for making and use of same

Patent metadata

Field	Value
Publication number	US-9809742-B2
Application number	US-201313888457-A
Country	US
Kind code	B2
Filing date	May 7, 2013
Priority date	May 7, 2013
Publication date	Nov 7, 2017
Grant date	Nov 7, 2017

Abstract

A hydraulic fracturing composition includes: a superabsorbent polymer in an expanded state and configured to break in response to a breaking condition; a plurality of proppant particles disposed in the superabsorbent polymer prior to release of the plurality of proppant particles from the superabsorbent polymer in response to breaking the superabsorbent polymer; and a fluid to expand the superabsorbent polymer into the expanded state. The hydraulic fracturing composition can be made by contacting a superabsorbent polymer with a fluid to expand the superabsorbent polymer into an expanded state; and disposing a plurality of proppant particles in the superabsorbent polymer to make the hydraulic fracturing composition. A process for disposing a plurality of proppant particles in a fracture comprises: disposing a hydraulic fracturing composition in a downhole environment; forming a fracture in the downhole environment; disposing the hydraulic fracturing composition in the fracture; breaking the superabsorbent polymer after forming the fracture; and releasing the plurality of proppant particles from superabsorbent polymer to dispose the plurality of proppant particles in the fracture.

First claim

What is claimed is:

1. A process for disposing a plurality of proppant particles in a fracture, the process comprising:
disposing a hydraulic fracturing composition in a downhole environment, the hydraulic fracturing composition comprising:
a superabsorbent polymer in an expanded state and configured to break in response to a breaking condition, such that a decomposed polymer is formed from the superabsorbent polymer; the superabsorbent polymer comprising particles having a size from 50 pm to 1000 pm prior to being in the expanded state; the particles having internal crosslinks derived from ethyleneglycol diacrylate, polyethyleneglycol diacrylate, trimethylopropane trimethacrylate, ethoxylated trimethylol triacrylate, ethoxylated pentaerythritol tetracrylate, or a combination comprising at least one of the foregoing but no intra-particle crosslinks; the superabsorbent polymer including a repeat unit derived from an acrylate, an acrylamide, a vinylpyrrolidone, a vinyl acetate, a 2-acrylamide-2-methylpropanesulfonic acid, an acrylic acid salt, a derivative thereof, or a combination thereof;
a plurality of proppant particles disposed in a space between adjacent superabsorbent polymer particles prior to release of the plurality of proppant particles from the space between the adjacent superabsorbent polymer particles in response to breaking the superabsorbent polymer;
a fluid to expand the superabsorbent polymer into the expanded state; and
a breaker, the superabsorbent polymer and the breaker being selected such that the breaker reacts with the superabsorbent polymer to break a bond in a polymer chain of the super absorbent polymer, a bond in a crosslink of the superabsorbent polymer, a bond between the crosslink and the polymer chain, or a combination thereof;
forming a fracture in the downhole environment;
disposing the hydraulic fracturing composition in the fracture;
breaking the superabsorbent polymer after forming the fracture with the breaker; and
releasing the plurality of proppant particles from the space between adjacent superabsorbent polymer particles to dispose the plurality of proppant particles in the fracture;
wherein the hydraulic fracturing composition is free of a viscose polymer selected from guar; polysaccharide; xanthan gum; a derivative of starch, guar, or cellulose, and a combination thereof, and the hydraulic fracturing composition is free of a crosslinking agent.

2. The process of claim 1 , wherein breaking the super absorbent polymer comprises forming a decomposed polymer having a lower molecular weight than the super absorbent polymer.

3. The process of claim 1 , wherein the breaker is encapsulated in an encapsulating material.

4. The process of claim 1 , wherein forming a fracture in the downhole environment comprises applying hydraulic force on the downhole environment from the hydraulic fracturing composition.

5. The process of claim 1 , wherein the superabsorbent polymer is present in a mass concentration from 1 ppt to 200 ppt, based on the total volume of the hydraulic fracturing composition.

6. The process of claim 1 , wherein the plurality of proppant particles is present in a mass concentration from 0.1 lb/gal to 12 lb/gal, based on the total volume of the hydraulic fracturing composition.

7. The process of claim 1 , wherein the breaker is present in a mass concentration greater than 0 ppt to less than or equal to 20 ppt, based on the total volume of the hydraulic fracturing composition.

8. The process of claim 1 , wherein a time the plurality of proppant particles are disposed in the superabsorbent polymer prior to release from the superabsorbent polymer is greater than or equal to 20 min at a temperature greater than or equal to 150° F.

9. The process of claim 1 , wherein the breaking condition comprises contact between the breaker and the superabsorbent polymer.

10. The process of claim 1 , wherein the superabsorbent polymer in an expanded state has a viscosity of from 1 centipoise to 300 cP, as measured by Ofite M900 rheometer for less than 100 cP viscosity or Grace M5500 rheometer for more than 100 cP viscosity at a temperature of 180° F.

11. The process of claim 1 , wherein the superabsorbent polymer is polyacrylamide having crosslinks derived from polyethylene glycol diacrylate.

12. The process of claim 1 , wherein the breaker comprises an oxidizer which comprises a peroxide, a persulfate, a peracid, or a combination thereof.

13. The process of claim 1 , wherein the superabsorbent polymer is a copolymer derived from an acrylic acid and an salt thereof.

14. The process of claim 13 , wherein the superabsorbent polymer comprises internal crosslinks derived from polyethylene glycol diacrylate.

15. A process for disposing a plurality of proppant particles in a fracture, the process comprising:
disposing a hydraulic fracturing composition in a downhole environment, the hydraulic fracturing composition comprising, based on the total volume of the hydraulic composition;
5 ppt to 200 ppt of a superabsorbent polymer in an expanded state and configured to break in response to a breaking condition, such that a decomposed polymer is formed from the superabsorbent polymer; the superabsorbent polymer comprising particles having internal crosslinks derived from ethyleneglycol diacrylate, polyethyleneglycol diacrylate, trimethylopropane trimethacrylate, ethoxylated trimethylol triacrylate, ethoxylated pentaerythritol tetracrylate, or a combination comprising at least one of the foregoing, the superabsorbent polymer including a repeat unit derived from an acrylate, an acrylamide, a vinylpyrrolidone, a vinyl acetate, a 2-acrylamide-2-methylpropanesulfonic acid, an acrylic acid salt, a derivative thereof, or a combination thereof, wherein the superabsorbent polymer is in the expanded state and has a viscosity of about 1 centipoise to 300 centipoise as measured by Ofite M900 rheometer at a temperature of 180° F.;
0.1 lb/gal to 12 lb/gal of a plurality of proppant particles disposed in a space between adjacent superabsorbent polymer particles prior to release of the plurality of proppant particles from the space between the adjacent superabsorbent polymer particles in response to breaking the superabsorbent polymer;
a fluid to expand the superabsorbent polymer into the expanded state; and
greater than 0 ppt to less than or equal to 20 ppt of a breaker, the superabsorbent polymer and the breaker being selected such that the breaker reacts with the superab sorbent polymer to break a bond in a polymer chain of the super absorbent polymer, a bond in a crosslink of the superabsorbent polymer, a bond between the crosslink and the polymer chain, or a combination thereof,
forming a fracture in the downhole environment;
disposing the hydraulic fracturing composition in the fracture;
breaking the superabsorbent polymer after forming the fracture with the breaker; and
releasing the plurality of proppant particles from the space between adjacent superabsorbent polymer particles to dispose the plurality of proppant particles in the fracture;
wherein the hydraulic fracturing composition is free of a viscose polymer selected from guar; polysaccharide; xanthan gum; a derivative of starch, guar, or cellulose, and a combination thereof.

16. The process of claim 15 , wherein the fluid to expand the superabsorbent polymer comprises water, brine, mineral acid, organic acid, or a combination comprising at least one of the foregoing.

17. The process of claim 15 , wherein the fluid to expand the superabsorbent polymer comprises a salt, which is NaCl, KCl, NaBr, MgCl 2 ,

Assignees

• Zhou Jia
• Sun Hong
• Qu Qi
• Guerin Michael
• Baker Hughes A Ge Co Llc

Inventors

• Zhou Jia
• Sun Hong
• Qu Qi
• Guerin Michael

Classifications

• C09K8/805 Primary

  Coated proppants · CPC title

• C09K8/685

  containing cross-linking agents · CPC title