[특허]NMR logging tool with Hi-Tc trap field magnet

[미국특허] NMR logging tool with Hi-Tc trap field magnet 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01V-003/00
출원번호	US-0567731 (2000-05-10)
발명자 / 주소	Nongqiang Fan Wei-Kan Chu
출원인 / 주소	University of Houston
대리인 / 주소	Madan, Mossman & Sriram, P.C.
인용정보	피인용 횟수 : 19 인용 특허 : 6

초록 ▼

Trapped field magnets (TFMS) on an NMR logging tool are used to produce a static magnetic field in a formation surrounding a borehole. The TFMs are made of material having a high Tc, so that the magnetic field can be sustained for the duration of the well logging by enclosing the TFMs within a cryostat containing liquid nitrogen as a coolant. By using the TFMs, the field strength within this region is much higher than is attainable with conventional magnets, giving an improved signal to noise (S/N) ratio for the NMR signals. The magnetic field strength within the TFMs is kept at a low enough value that instability problems associated with these materials do not arise. The field strength may be selected based upon knowledge of the resistivity and dielectric constant of the formation and the associated skin depth for electromagnetic signals. This makes it possible to use the TFMs in both wireline and measurement while drilling (MWD) environments. In one embodiment of the invention, the TFMs are magnetized outside the borehole environment using conventional high field strength electromagnets prior to emplacement within the cryostats. In another embodiment of the invention, vortex currents within the TFMs are induced in situ over a period of time, so that the power requirements for the inducing field are attainable in a borehole environment. A pulsed radio frequency (RF) magnetic field is produced using an RF antenna in the NMR tool that is orthogonal to the direction of the static magnetic field. The NMR pulse echo signals induced in the formation indicative of a parameter of interest in the formation is received by a receiver on the tool

대표청구항 ▼

1. An apparatus for obtaining information about a parameter of interest of a formation surrounding a borehole, said apparatus comprising:(a) a trapped field magnet arrangement for generating a static magnetic field in a region of examination of the formation; (b) a temperature control device for maintaining the trapped field magnet arrangement below a critical temperature of material comprising the trapped field magnet arrangement; (c) a radio frequency (RF) transmitter for generating a pulsed RF magnetic field having a frequency and a direction substantially orthogonal to a direction of the static magnetic field in the region of examination, said RF transmitter exciting nuclei in the region of examination; and (d) a RF receiver for receiving nuclear magnetic resonance signals from the excited nuclei and providing an output signal indicative of the parameter of interest.

이 특허에 인용된 특허 (6) 인용/피인용 타임라인 분석

Kleinberg Robert L. (Ridgefield CT) Griffin Douglas D. (Bethel CT) Fukuhara Masafumi (Ridgefield CT) Sezginer Abdurranhman (Ridgefield CT) Chew Weng C. (Champaign IL) Kenyon William E. (Ridgefield CT, Borehole measurement of NMR characteristics of earth formations, and interpretations thereof.
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Jones Francis J. (Witney GBX) Daniels Peter D. (Daventry GBX), Cryostat assembly.
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Hanley Peter (Forest of Dean GBX), Magnet assembly for NMR.
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Jackson Jasper A. (Los Alamos NM) Cooper Richard K. (Los Alamos NM), Magnetic resonance apparatus.
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Chu Ching-wu ; Xue Yuyi ; Gao Li ; Meng Ruling ; Ramirez Diego Alberto, Strong high-temperature superconductor trapped field magnets.
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Miller Melvin (Wynnewood PA), System for logging a well during the drilling thereof.
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이 특허를 인용한 특허 (19) 인용/피인용 타임라인 분석

Siess, Charles Preston; Syngaevsky, Pavel, Abnormal pressure determination using nuclear magnetic resonance logging.
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Kruspe, Thomas, Acoustic excitation with NMR pulse.
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Blanz,Martin, Correction of NMR artifacts due to axial motion and spin-lattice relaxation.
상세보기
Kruspe, Thomas; Kiesl, Christian; Thern, Holger; Schrader, Hartmut, Downhole NMR processing.
상세보기
Islam, Zahirul; Das, Ritesh K.; Weinstein, Roy, Dual-stage trapped-flux magnet cryostat for measurements at high magnetic fields.
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Kennedy,Timothy Wayne; Schnell,Rodney Alan; Vandal,Bryan Armand, Integrated magnetic ranging tool.
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Ramirez, Marc Stephen; Forgang, Stanislav Wilhelm; Kouchmeshky, Babak, Magnet arrays for magnetic resonance measurements.
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Ozarslan, Evren; Basser, Peter J., Magnetic resonance specimen evaluation using multiple pulsed field gradient sequences with a wavenumber magnitude local minimum and restricted compartment estimation.
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Troxler, Robert Ernest, Methods, systems, and computer program products for determining a property of construction material.
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Troxler, Robert Ernest, Methods, systems, and computer program products for determining a property of construction material.
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Troxler, Robert Ernest, Methods, systems, and computer program products for determining a property of construction material.
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Troxler, Robert Ernest; Dep, Wewage Hiran Linus, Methods, systems, and computer program products for measuring the density of material.
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Troxler, Robert Ernest, Methods, systems, and computer program products for measuring the density of material including a non-nuclear moisture property detector.
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Troxler, Robert Ernest; Steckmann, Dirk M.; Weger, Donald E., Nuclear gauges and methods of configuration and calibration of nuclear gauges.
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Weger, Donald E.; Steckmann, Dirk M.; Troxler, Robert E., Nuclear gauges and methods of configuration and calibration of nuclear gauges.
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Weger, Donald E.; Steckmann, Dirk M.; Troxler, Robert E., Nuclear gauges and methods of configuration and calibration of nuclear gauges.
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Bartlett, James E.; Verna, Raffaello; Pratt, Jr., James D., Nuclear gauges and related methods of assembly.
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Bartlett, James E.; Verna, Raffaello; Weger, Donald E.; Steckmann, Dirk M., Nuclear gauges and related methods of assembly.
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Sinclair, Paul L.; Springer, Thomas A.; Clontz, Joseph K., Polar display for use with drilling tools.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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[미국특허] NMR logging tool with Hi-Tc trap field magnet 원문보기