METHODS AND APPARATUS FOR EVALUATING DOWNHOLE CONDITIONS WITH RFID MEMS SENSORS
摘要
A radio frequency identification (RFID) tag can include a die attached to an inductive-capacitive (LC) circuit including a capacitive element coupled to an inductive element. The LC circuit can have a resonant frequency that varies according to properties of fluid proximate the RFID tag. The RFID tag can further include a coating material disposed around the die to form an outer surface of the RFID tag. The coating material may have a thickness over a portion of the LC circuit, to permit a conductivity property of a fluid proximate the outer surface to affect the resonant frequency of the LC circuit such that the resonant frequency shifts to a second resonant frequency. Additional apparatus, systems, and methods are disclosed.
申请公布号
CA2929374(A1)
申请公布日期
2015.07.09
申请号
CA20142929374
申请日期
2014.12.11
申请人
HALLIBURTON ENERGY SERVICES, INC.
发明人
ROBERSON, MARK W.;RODDY, CRAIG W.;BARTEE, CHARLES;MCGUIRE, KRISTOPHER;RAVI, KRISHNA M.;ROTHROCK, GINGER;GOODWIN, SCOTT