Back to results
US 2019/0055463 A1Published application
Fracturing fluid composition containing an acrylamido-tert-butylsulfonate polymer
AssigneeKing Fahd University of Petroleum and Minerals
InventorsMohamed Ahmed Nasr El-Din MAHMOUD, Salah El-Din ELKATATNY, Marwan Nagm Eldeen MOHAMMAD
Life of this patent
Estimating the term…
Abstract
A fracturing fluid composition that includes a chelating agent, e.g. GLDA, and a polymeric additive comprising a copolymer of acrylamido-tert-butyl sulfonate and hydrolyzed polyacrylamide diluted in an aqueous base fluid, e.g. seawater, and a method of fracking a geological formation using the fracturing fluid composition. Various embodiments of the fracturing fluid composition and the method of fracking are also provided.
Claims8
1:
- A fracturing fluid composition, comprising:
- an aqueous base fluid;
- a chelating agent comprising glutamic diacetic acid in an amount of 5-20 wt %, wherein wt % is relative to the total weight of the fracturing fluid composition;
- and
- a polymeric additive comprising a copolymer of acrylamido-tert-butyl sulfonate and partially hydrolyzed polyacrylamide, in an amount of 0.45-1 wt %, wherein wt % is relative to the total weight of the fracturing fluid composition, wherein the partially hydrolyzed polyacrylamide has a molar ratio of amide groups to carboxylate groups of 0.5 to 6;
- wherein a weight percent of acrylamido-tert-butyl sulfonate in the copolymer is in the range of 5 to 20 wt %, and a weight percent of the partially hydrolyzed polyacrylamide in the copolymer is in the range of 80 to 95 wt %, each relative to the total weight of the copolymer.
3 more elements
2-4. (canceled)
5:
- The fracturing fluid composition of claim 1, wherein the aqueous base fluid is seawater.
6-8. (canceled)
9:
- The fracturing fluid composition of claim 1, which has a plastic viscosity of 2 to 8 cP at a temperature of 280 to 320° F.
10:
- The fracturing fluid composition of claim 1, which has a yield point of 2 to 15 lb/100 ft2 at a temperature of 280 to 320° F.
11-20. (canceled)
21:
- The fracturing fluid composition of claim 1, wherein a weight percent of acrylamido-tert-butyl sulfonate in the copolymer is in the range of 5 to 10 wt %, and a weight percent of partially hydrolyzed polyacrylamide in the copolymer is in the range of 90 to 95 wt %, each relative to the total weight of the copolymer.