Compositions for enhancing viscosity of subterranean fluids utilizing chelating agents
AssigneesSaudi Arabian Oil Company, King Fahd University of Petroleum and Minerals
InventorsRajendra Arunkumar Kalgaonkar, Amro Othman, Muhammed Shahzad Kamal, Mohamed Mahmoud, Murtada Saleh Aljawad, Qasim Sahu
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Abstract
A composition for use in well stimulation operations, the composition comprising a saline fluid, the saline fluid comprising between 50,000 ppm and 70,000 ppm; a polymer, the polymer operable to react with a crosslinker to increase a viscosity of the saline fluid; a zirconium crosslinker, the zirconium crosslinker operable to react with the polymer; and a chelating agent, the chelating agent comprises L-glutamic acid N, N diacetic acid (GLDA), wherein the GLDA is present in an amount between 1 wt % and 8 w t %.
Claims8
A composition for use in well stimulation operations, the composition comprising:
- a saline fluid, the saline fluid comprising between 50,000 ppm and 70,000 ppm;
- a polymer, the polymer operable to react with a crosslinker to increase a viscosity of the saline fluid, wherein the polymer is present in an amount between 0.5 wt % and 0.6 wt %;
- a zirconium crosslinker, the zirconium crosslinker operable to react with the polymer, wherein the zirconium crosslinker is present in an amount of 1 wt %;
- and
- a chelating agent, the chelating agent comprises L-glutamic acid N, N diacetic acid (GLDA), wherein the GLDA is present in an amount between 1 wt % and 8 wt %,
- wherein the composition has a viscosity in the range between 90 cP and 1000 cP after 4 hours,
- wherein the composition has a pH between 10 and 14 where pH greater than 10 activates the zirconium crosslinker.
A method of using a hydraulic fracturing fluid, the method comprising the step of:
- injecting the hydraulic fracturing fluid into a formation during a well stimulation operation, wherein the hydraulic fracturing fluid comprises:
- a saline fluid, the saline fluid comprising between 50,000 ppm and 70,000 ppm;
- a polymer, the polymer operable to react with a crosslinker to increase a viscosity of the saline fluid, wherein the polymer is present in an amount between 0.5 wt % and 0.6 wt %;
- a zirconium crosslinker, the zirconium crosslinker operable to react with the polymer wherein the zirconium crosslinker is present in an amount of 1 wt %;
- and
- a chelating agent, the chelating agent comprises L-glutamic acid N, N diacetic acid (GLDA), wherein the GLDA is present in an amount between 1 wt % and 8 wt %;
- and
- wherein the hydraulic fracturing fluid has a viscosity of 1000 cP before reaching the formation and a viscosity of between 90 cP and 100 cP after 1 hour, wherein the hydraulic fracturing fluid has a pH between 10 and 14, where pH greater than 10 activates the zirconium crosslinker.
Dependencies are inferred from the claim text.