Abstract
Abstract This paper presents a technique to reduce or plug permeability to water in primary hydrocarbon production wells and secondary injection hydrocarbon wells without causing damage to the subsurface environment. The principle of the operation is to pump a water-thin monomer solution in a single stage into the formation. The monomer then forms a polymer through a process activated by well temperature. Relative solubility of the resulting gel is directly controlled by the concentration of monomer placed in the formation. The polymerized material (gel) plugs pore spaces and channels, thus limiting undesired fluid flow. The ecologically friendly system (EFS) avoids use of metal crosslinkers and allows for extended and reproducible gel times; it is nontoxic and acid-resistant. Treatment techniques described in this paper may be applied to correct numerous conformance problems, including those listed below: coning in production wellshigh-permeability streaksinterwell channelinginjection out of zone
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