发明名称 |
CASING MOUNTED EM TRANSDUCERS HAVING A SOFT MAGNETIC LAYER |
摘要 |
Illustrative permanent electromagnetic (EM) monitoring systems and methods have a casing string positioned inside a borehole and equipped with one or more EM transducer modules having a layer of soft magnetic material that substantially encircles the casing string to amplify a signal response of a magnetic field transmitting and/or sensing element. The layer preferably has an axial dimension at least twice an axial dimension of the magnetic field sensing element, with a relative permeability at least twice that of the casing material. The magnetic field transmitting element can be a coil. The magnetic field sensing element can be a coil or a piezoelectric or magnetostrictive element that applies stress to an optical fiber. A well interface system communicates with the one or more EM transducer modules to transmit and/or collect EM signals over time. Additional casing strings may be provided in other nearby boreholes to enable tomographic mapping and monitoring of fluid interfaces in the reservoir. |
申请公布号 |
CA2921387(A1) |
申请公布日期 |
2015.05.21 |
申请号 |
CA20142921387 |
申请日期 |
2014.10.08 |
申请人 |
HALLIBURTON ENERGY SERVICES, INC. |
发明人 |
WILSON, GLENN ANDREW;DONDERICI, BURKAY |
分类号 |
E21B47/00;G01V3/18;G01V3/38 |
主分类号 |
E21B47/00 |
代理机构 |
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主权项 |
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地址 |
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