Delayed-gelation solution
AssigneeSchlumberger Technology Corporation
InventorsStephen Davies, Trevor Hughes, Henk Lekkerkerker, Michel Van Bruggen, Arnaud Van Der Beken
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Abstract
The invention concerns an aqueous delayed-gelation solution for use in hydrocarbon wells. According to the invention, the aqueous delayed-gelation solution a dissolved metal salt which, in use, hydrolyses to form a gel, wherein the solution contains suspended inorganic particles and the method comprises the steps of—providing the aqueous delayed-gelation solution, and—injecting the solution into the hydrocarbon well, whereby the suspended inorganic particles reduce or block the flow of the delayed-gelation solution to relatively low permeability formation zones thereby selectively placing the solution in a relatively high permeability formation zone.
Claims7
A delayed-gelation system for selective placement in well formation zones, comprising:
- an aqueous delayed-gelation solution comprising a dissolved aluminium salt which is capable of hydrolysis, in use, to form a gel,
- wherein the solution of said aluminium salt contains suspended inorganic particles which comprise alumina coated silica.
A delayed-gelation system for selective placement in well formation zones, comprising:
- an aqueous delayed-gelation solution comprising a dissolved metal silicate salt which is capable of hydrolysis, in use, to form a gel,
- wherein the solution of said salt contains suspended colloidal inorganic particles which are boehmite coated with silica.
Dependencies are inferred from the claim text.