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1.发明申请公开(公告)号：US20170082772A1
公开(公告)日：2017-03-23
申请号：US15258749
申请日：2016-09-07
Applicant: CHINA UNIVERSITY OF PETROLEUM-BEIJING
Inventor： LIZHI XIAO , GUANGZHI LIAO , QUNJIE DU , XIN LI , SIHUI LUO
CPC classification number: G01V3/32 , G01R33/341 , G01R33/3808
Abstract: The present invention provides a nuclear magnetic resonance logging instrument probe with double-layered magnets and an antenna excitation method, the nuclear magnetic resonance logging instrument probe includes: a probe framework and a shielding layer arranged in the probe framework; a plurality of main magnets are provided above and below the shielding layer, respectively; central axes of the main magnets are parallel with each other, and distances between the central axes of each of the main magnets and a central axis of the probe framework are the same; a distance between central axes of any two main magnets is not smaller than a first preset value; and an antenna is provided at outer side of each main magnety. In the present invention, circumferential recognizing capability of the nuclear magnetic resonance logging instrument probe can be improved and three-dimensional (radial, axial and circumferential) stratum detection can be achieved.
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2.发明申请公开(公告)号：US20170082773A1
公开(公告)日：2017-03-23
申请号：US15258767
申请日：2016-09-07
Applicant: CHINA UNIVERSITY OF PETROLEUM-BEIJING
Inventor： LIZHI XIAO , GUANGZHI LIAO , QUNJIE DU , SIHUI LUO
CPC classification number: G01V3/32 , G01N24/081 , G01R33/3415 , G01R33/3808 , G01R33/383
Abstract: The present invention provides a nuclear magnetic resonance logging instrument probe with multi-layered magnet and an antenna excitation method, the nuclear magnetic resonance logging instrument probe includes a probe skeleton, multiple magnet assemblies and a plurality of antennas; the probe skeleton is of a cylindrical shape, multiple magnet assemblies are distributed in the circumferential direction of the probe skeleton; the magnet assembly includes at least two layers of magnet arranged from top to bottom, the magnet is magnetized in a radial direction, two adjacent layers of magnet are magnetized in opposite directions; an antenna is arranged outside each magnet assembly, multiple antennas are independently fed. In the nuclear magnetic resonance logging instrument probe and antenna excitation method, through exciting different antennas, detection of stratum information at different azimuth angles is realized, which improves circumferential resolution of the probe, realize stratum detection in three dimensions along radius, axis and circumference.
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3.发明申请公开(公告)号：US20170085008A1
公开(公告)日：2017-03-23
申请号：US15258731
申请日：2016-09-07
Applicant: CHINA UNIVERSITY OF PETROLEUM-BEIJING
Inventor： LIZHI XIAO , ZHE SUN , GUANGZHI LIAO , SIHUI LUO , XIN LI , QUNJIE DU , WEI LIU , WEILIANG CHEN , JIE WANG
CPC classification number: G01R33/3415 , G01N24/081
Abstract: The present invention provides a multi-detecting depth nuclear magnetic resonance logging tool and probe, and an antenna excitation method, the probe of nuclear magnetic resonance logging tool includes: a housing, a magnet and an antenna array apparatus; the magnet is fixedly arranged in the housing; the antenna array apparatus includes at least two groups of antenna arrays distributed along circumference of the magnet, and each group of antenna arrays include N layers of independently fed antennas; k-th layer antenna is arranged between the magnet and (k+1)-th layer antenna, k=1, 2, . . . N−1; the antenna is fixed on a support, and the support is fixedly connected to the housing. In the present invention, stratum information detection at different azimuth angles is achieved by exciting different antenna arrays, so that circumferential recognizing capability of nuclear magnetic resonance logging tool probe is improved and three-dimensional (radial, axial and circumferential) stratum detection is achieved.
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