发明名称 |
System and method for measurement incorporating a crystal resonator |
摘要 |
A system, method and device for interrogating a downhole environment in a borehole beneath a surface includes a source of electromagnetic energy, operable to transmit an electromagnetic signal in the borehole, a sensor module, including a passive resonator having a resonant frequency that varies with changes in the condition in the downhole environment to reflect the electromagnetic signal and generates harmonic frequencies in response to a condition in the downhole environment in the borehole and a detector positionable to receive a returned electromagnetic signal. Embodiments include a filter to pass a harmonic of the resonant frequency of the resonating circuit and circuitry configured and arranged to measure the frequency of the harmonic signal. |
申请公布号 |
US9097101(B2) |
申请公布日期 |
2015.08.04 |
申请号 |
US201213434332 |
申请日期 |
2012.03.29 |
申请人 |
CHEVRON U.S.A INC. |
发明人 |
Smithson Mitchell Carl |
分类号 |
E21B47/06;G01V3/30;E21B47/09 |
主分类号 |
E21B47/06 |
代理机构 |
Pillsbury Winthrop Shaw Pittman, LLP |
代理人 |
Pillsbury Winthrop Shaw Pittman, LLP |
主权项 |
1. A system for interrogating a downhole environment in a borehole beneath a surface, comprising:
a source of electromagnetic energy, operable to transmit an electromagnetic signal in the borehole; a sensor module, comprising a passive resonating circuit having a resonant frequency that varies with changes in a condition in the downhole environment, such that the resonating circuit returns at least a portion of the electromagnetic signal along with harmonics of the resonant frequency in response to the condition in the downhole environment in the borehole; a detector, positionable to receive the returned portion of the electromagnetic signal, the detector including a filter configured and arranged to attenuate a signal at the resonant frequency, and configured and arranged to pass a signal at a harmonic of the resonant frequency. |
地址 |
San Ramon CA US |