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US 12,612,545 B1Granted
Bio-composite seal for water shut off application in a fractured substrate
AssigneeSaudi Arabian Oil Company
InventorsAyman M. Almohsin, Tariq Abdulsattar Almubarak, Mohammed I. Alabdrabalnabi, Ahmed A. Al Sulaiman
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Abstract
A bio-composite solution that includes crushed coffee waste, colloidal nanosilica, and an activator is injected into a fracture zone of a subterranean formation. The bio-composite solution is cured at a downhole temperature in the fracture space to form a rigid solid gel. The rigid solid gel is strengthened due to the presence of coffee waste in its matrix and can block water flow from an overlying aquifer zone through the fracture into a production well.
Claims10
A method for water shut off in a production well, the method comprising:
- injecting a composite solution comprising crushed coffee waste, colloidal nanosilica, and an activator into a target zone of a subterranean formation in which a hydrocarbon-producing production well is formed, wherein the target zone is conductive to aqueous fluid into the production well;
- sealing the target zone to flow of the aqueous fluid into the production well by curing the composite solution at downhole conditions, wherein the colloidal nanosilica reacts with the activator to form a solid gel interspersed with the crushed coffee waste;
- and
- after sealing the target zone, producing a mixture of fluids through the production well.
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Dependencies are inferred from the claim text.