Patent ID: 9382765
Filing Date: 2016-07-05
CPC Classification: E21B

Claim Text:
1. An apparatus for recovering hydrocarbon resources in a subterranean formation comprising: a radio frequency (RF) source; a controllable ferrofluid source for a ferrofluid having a controllable magnetic property, said controllable ferrofluid source comprising an RF applicator coupled to said RF source and configured to supply RF power to the hydrocarbon resources, said RF applicator comprising a plurality of concentric tubular conductors defining a pair of ferrofluid passageways coupled to said ferrofluid source; and an impedance sensor coupled to said RF applicator and configured to measure an impedance thereof while RF power is being supplied to the hydrocarbon resources; said controllable ferrofluid source cooperating with said particle supply and said particle separator and being configured to change an amount of particles in the ferrofluid based upon the sensed impedance.