Degradable friction reducer for hydraulic fracturing treatments

Patent metadata

Field	Value
Publication number	US-2024409805-A1
Application number	US-202418811334-A
Country	US
Kind code	A1
Filing date	Aug 21, 2024
Priority date	Aug 11, 2021
Publication date	Dec 12, 2024
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 method of making a polyacrylamide friction reducer, comprising:
mixing acrylamide, acrylic acid, NaOH, one or more surfmers, and water together to form a solution; and adding one or more initiators to react the solution into a final product comprising the polyacrylamide friction reducer.

2 . The method of claim 1 , wherein the solution further comprises sodium persulfate, sodium metabisulfite, V-50, or MEHQ.

3 . The method of claim 2 , wherein the sodium persulfate, sodium metabisulfite, V-50, or MEHQ are added at concentrations up to about 1 wt %.

4 . The method of claim 1 , wherein the acrylamide is present at about 25-40 wt %.

5 . The method of claim 1 , wherein the solution further comprises AMPS or NaAMPS.

6 . The method of claim 5 , wherein the AMPS or NaAMPS is present at about 5-10 wt %.

7 . The method of claim 1 , wherein the water is present at about 30-60 wt %.

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

9 . The method of claim 1 , wherein the acrylamide is present at about 50 wt %.

10 . The method of claim 1 , further comprising:
adjusting a pH of the solution.

11 . The method of claim 10 , wherein the pH of the solution is adjusted to be between about 5.5 and 7.0.

12 . The method of claim 1 , further comprising:
purging the solution with nitrogen.

13 . The method of claim 1 , further comprising:
agitating the solution.

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

15 . The method of claim 1 , further comprising:
adjusting a temperature of the solution.

16 . The method of claim 15 , wherein the temperature is adjusted to between about 15-30 degrees Celsius.

17 . The method of claim 1 , further comprising:
drying the final product into a final dry powder product comprising the polyacrylamide friction reducer.

18 . The method of claim 1 , further comprising at least one of:
cutting the final product; grinding the final product; and sieving the final product.

19 . The method of claim 1 , wherein the NaOH is present at about 5-10 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

• E21B43/26

  by forming crevices or fractures · CPC title

• C09K2208/28

  Friction or drag reducing additives · CPC title

• C09K8/88

  macromolecular compounds · CPC title

• C09K8/68 Primary

  containing organic compounds · CPC title