Rubber member for downhole tools, downhole tool, and method for recovering hydrocarbon resource
AssigneeKureha Corporation
InventorsTAKEO TAKAHASHI, MASAYUKI OKURA
Life of this patent
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Abstract
A rubber member for downhole tools, preferably a seal member, ball sealer, ball seat, or protecting member, of which a decrease rate of 50% strain compressive stress after immersion for 24 hours in 150° C. water relative to 50% strain compressive stress before immersion is not less than 5%, and preferably not less than 50%; a downhole tool comprising the rubber member; and a method for recovering a hydrocarbon resource using the downhole tool.
Claims30
A rubber member for downhole tools, of which a decrease rate of a 50% strain compressive stress after immersion for 24 hours in 150° C. water relative to a 50% strain compressive stress before immersion is not less than 5%.
A rubber member for downhole tools, of which a loss rate of mass after immersion for 72 hours in 150° C. water relative to a mass before immersion is from 5% to 100%.
Dependencies are inferred from the claim text.