Degradable friction reducer for hydraulic fracturing treatments

Patent metadata

Field	Value
Publication number	US-2023058884-A1
Application number	US-202217885251-A
Country	US
Kind code	A1
Filing date	Aug 10, 2022
Priority date	Aug 11, 2021
Publication date	Feb 23, 2023
Grant date	—

Abstract

A polyacrylamide friction reducer wherein the friction reducer contains surfactant functional groups, and wherein the polyacrylamide friction reducer is degradable, can be used for multi-functional, slickwater fracturing fluid projects. Under downhole conditions, the polymer degrades and releases the surfactant molecules to act as oil displacing agent to provide additional stimulation.

First claim

What is claimed is:

1 . A composition for reducing friction in a fracturing fluid comprising:
a polyacrylamide friction reducer comprising:
a polyacrylamide polymer; and
one or more surfmers bonded to the polyacrylamide polymer.

2 . The composition of claim 1 wherein a bond between the polyacrylamide polymer and the one or more surfmers is degradable under downhole conditions.

3 . The composition of claim 1 wherein the one or more surfmers bond at the acrylate groups of the polyacrylamide polymer.

4 . The composition of claim 1 wherein the one or more surfmers comprise poly(ethylene glycol) behenyl ether acrylate or methacrylate, lauryl polyethoxy (meth)acrylate, Cetyl polyethoxy (meth)acrylate and stearyl polyethoxy (meth)acrylate.

5 . The composition of claim 1 wherein the one or more surfmers is derived from Tergitol 15-5-15, Poly(ethylene glycol) (19) tridecyl ether, DOWFAX 8390, glycolic acid ethoxylate oleyl ether, glycolic acid ethoxylate 4-nonylphenyl ether, an ether sulfonate, or an alkyl alkoxylated nonionic surfactant.

6 . The composition of claim 1 wherein the one or more surfmers derive from an ether sulfonate or an alkyl alkoxylated nonionic surfactant

7 . The composition of claim 1 further comprising:
acrylic acid, 2-Acrylamido-2-methylpropane sulfonic acid (AMPS), or a salt form of AMPS (NaAMPS).

8 . A method of fracturing a well comprising:
reacting acrylamide and other monomers with one or more surfmers to form polyacrylamide friction reducer; adding the polyacrylamide friction reducer to a well fracturing fluid; pumping the well fracturing fluid into the well; and reducing the friction within the well with the polyacrylamide friction reducer.

9 . The method of claim 8 further comprising:
breaking chemical bonds between the polyacrylamide polymer and the one or more surfmers under downhole conditions.

10 . The method of claim 9 wherein the one or more surfmers released from the polyacrylamide polymer displace hydrocarbon in the well.

11 . The method of claim 8 wherein the polyacrylamide friction reducer is added to the well fracturing fluid at a concentration of about 0.25 to 10 gallons friction reducer per 1,000 gallons of fracturing fluid.

12 . The method of claim 9 further comprising:
reducing the interfacial tensions within the well.

13 . A method of making a polyacrylamide friction reducer comprising:
mixing a 50% acrylamide, acrylic acid, NaOH, one or more surfmers, and water together to form a solution; adjusting a pH to between about 5.5 and 7.0; purging the solution with nitrogen and agitating the solution; adjusting a temperature of the solution to between about 15-30 degrees Celsius; and adding one or more initiators to react the solution into the friction reducer.

14 . The method of claim 13 further comprising sodium persulfate, sodium metabisulfite, V-50, or MEHQ.

15 . The method of claim 14 where the sodium persulfate, sodium metabisulfite, V-50, or MEHQ are added at concentrations up to about 1 wt %.

16 . The method of claim 13 wherein the solution is agitated for at least 30 minutes.

17 . The method of claim 13 wherein the acrylamide is present at about 25-40 wt %.

18 . The method of claim 13 wherein the solution further comprises AMPS or NaAMPS.

19 . The method of claim 13 wherein the water is present at about 30-60 wt %.

20 . The method of claim 13 wherein the one or more surfmers is present at about 1-10 wt %.

Assignees

• Cnpc Usa Corp
• Beijing Huamei Inc
• China Nat Petroleum Corp

Inventors

• Liu Fuchen
• Li Jianshen
• Lin Lijun
• Huang Jiangshui
• LIN Genyao
• Song Lulu
• Yu Stephanie

Classifications

• C09K2208/28

  Friction or drag reducing additives · CPC title

• C09K8/88

  macromolecular compounds · CPC title

• C09K8/68 Primary

  containing organic compounds · CPC title

• E21B43/26

  by forming crevices or fractures · CPC title