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method and composition for reducing the permeabilita is an area of high permeabilita in an oilfield.
method and composition for reducing the permeabilita is an area of high permeabilita in an oilfield.
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机译:降低渗透率的方法和组合物是油田中高渗透率的区域。
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摘要
A method for reducing the permeability of a high-permeability zone in a high-temperature oil reservoir comprises: - preparing a gellable polymeric aqueous solution, operating on the surface under controlled conditions; - injecting said gellable solution into the oil reservoir through a well; - moving the solution through the reservoir until it reaches and substantially fills the high-permeability zone to be treated; and - gelling the solution in situ with consequent lowering of the permeability in said high-permeability zone, and is essentially characterised in that the gellable solution is an aqueous solution containing a Cr(III) ion cross-linking agent and a water-soluble organic polymer cross-linkable by the effect of said cross-linking agent, said solution being free or substantially free of ligands for the cross-linking agent and having a pH adjusted to a value within the range of 1.5 to 5.5, depending on the desired gelling time.
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