Patent attributes
An apparatus includes a funnel, a core, a first coating, a second coating, and a third coating. The funnel includes multiple inlet ports and an outlet port. The core is disposed within the funnel. The first coating is disposed on and surrounds an outer surface of the core. The first coating is configured to dissolve in response to being exposed to water. The second coating is disposed on and surrounds an outer surface of the first coating. The second coating is configured to dissolve in response to being exposed to water. The third coating is disposed on and surrounds an outer surface of the second coating. The third coating is configured to dissolve in response to being exposed to a hydrocarbon.