CN1088791C - 核磁共振测井仪永磁体 - Google Patents

核磁共振测井仪永磁体 Download PDF

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CN1088791C
CN1088791C CN98113542A CN98113542A CN1088791C CN 1088791 C CN1088791 C CN 1088791C CN 98113542 A CN98113542 A CN 98113542A CN 98113542 A CN98113542 A CN 98113542A CN 1088791 C CN1088791 C CN 1088791C
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CN1235236A (zh
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邱衍军
肖圣前
曾凡明
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Wuhan Institute of Physics and Mathematics of CAS
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Abstract

本发明公开了一种核磁共振测井仪永磁体,它由永磁磁钢构成,其特征是由四块或多块永磁磁钢用强力胶粘结构成圆柱体,圆柱体内的内圆为空心,内圆与外圆极性相反,分别为N←→S极。该发明结构简单,没有极点盲区,可实现一次在360度全方位检测油井壁内地层,提高了仪器的检测灵敏度。也适用于检测超大体积的样品。

Description

核磁共振测井仪永磁体
本发明涉及一种核磁共振测井仪永磁体,主要配套于核磁共振测井仪检测油井壁内地层。
目前核磁共振测井仪采用的磁体主要有以下三种:一种是美国NUMAR公司的圆柱型磁体,该磁体是一块圆柱体磁钢,圆面两边分别为N-S极。磁场分布是由N-S两极间闭合的磁力线形成,在N、S两极各有一磁场盲区存在,导致核磁共振测井仪在测井时存在遗漏区域。该磁体具有结构简单、易加工、易充磁等优点,适合用铁氧体磁材料制作(该材料磁能级较低,可整体充磁)。另一种是美国Schlumberger公司的三片型磁体,该磁体由三块长方体磁钢构成,轴向磁场,各长方体磁钢的前后为N-S极,磁场分布是由磁钢的磁力线在检测区产生一个均匀磁场,该系统每次只能在一个方向小范围检测,所以在测井时需要增加旋转系统来实现对井壁的圆周测量,而且均匀场调试以及对环境的要求都很苛刻。再一种是英国Oxford公司的双圆柱型磁体,该磁体由两块圆柱体磁钢构成,轴向磁场,各圆柱体的两头为N-S极。磁场的分布是由圆柱体的闭合磁力线在检测区产生一均匀磁场,该系统每次也只能在一个方向小范围检测,所以在测井时需要增加旋转系统来实现对井壁的圆周测量,而且均匀场调试以及对环境的要求都很苛刻。以上三种磁体都能满足核磁共振测井仪的一些测试要求,但由于美国Schlumberger公司的三片型磁体和英国Oxford公司的双圆柱型磁体存在一些问题,目前国际上主要采用美国NUMAR公司的圆柱型磁体,也存在N、S两极各有一个磁场盲区,导致核磁共振测井仪在测井时存在遗漏区域。
本发明的目的是提供了一种核磁共振测井仪永磁体,永磁磁钢构成圆柱体,结构简单,没有盲区,在360度全方位检测油井壁内地层,检测精度高。
为达到上述目的,本发明采用以下技术方案:采用径向磁场,其内圆与外圆的极性相反,外圆上的磁力线呈放射型向外辐射,它由四块径向充磁的永磁磁钢构成,四块永磁磁钢用强力胶粘结组成圆柱体,内圆与外圆极性相反,内圆的磁场强度为零,外圆上的磁力线是呈放射型在360度全方位向外辐射,在空心圆柱体外形成磁场。
本发明与现有技术相比,具有以下优点和效果:结构简单,没有盲区,可实现一次在360度全方位大范围检测油井壁内地层,使核磁共振测井仪有效检测区域增大,提高了仪器的检测灵敏度。也适用于检测超大体积(直径或几何尺寸在500mm以上)的样品。
图1为核磁共振测井仪永磁体俯视图
图2为核磁共振测井仪永磁体结构示意图
下面根据附图对本发明作进一步详细描述:
根据图1、图2可知,核磁共振测井仪永磁体采用径向磁场,由四块或多块径向充磁的永磁磁钢1、2、3、4构成,永磁磁钢1、2、3、4用强力胶粘结构成圆柱体8,圆柱体8内为内圆5,圆柱体8的内圆5为空心,圆柱体8外为外圆6,内圆5与外圆6极性相反,分别为N←→S极,内圆5的磁场强度为零。外圆6上有分布均匀的磁力线7,所以外圆6的磁力线7是不会与内圆5闭合的,而是在360度全方位向外辐射。将圆柱体8固定到核磁共振测井仪的探头上,即可用于核磁共振测井,而且可实现只需一次测井就能完成全部井壁360度全方位的检测。

Claims (1)

1、一种核磁共振测井仪永磁体,由永磁磁钢(1)、(2)、(3)、(4)构成,其特征是四块永磁磁钢(1)、(2)、(3)、(4)用强力胶粘结构成圆柱体(8),内圆(5)为空心,内圆与外圆极性相反,分别为N←→S极。
CN98113542A 1998-05-08 1998-05-08 核磁共振测井仪永磁体 Expired - Fee Related CN1088791C (zh)

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Families Citing this family (5)

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Publication number Priority date Publication date Assignee Title
CN101294493B (zh) * 2007-04-29 2011-12-07 中国石油天然气集团公司 居中型核磁共振测井仪探头永磁体
CN101343998B (zh) * 2008-09-03 2012-05-30 中国石油天然气股份有限公司 核磁共振测井仪高温磁体及其制备方法
CN102360703B (zh) * 2011-10-12 2013-03-27 上海神开石油化工装备股份有限公司 一种石油井下核磁共振随钻测井仪的磁体结构
CN106710781B (zh) * 2016-12-20 2018-03-13 中国科学院电工研究所 一种核磁共振永磁体
CN111933384A (zh) * 2020-07-01 2020-11-13 四川大学 瓦形磁体组合为空心圆柱的磁场组合方法、永磁体及用途

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0646806A1 (fr) * 1993-09-30 1995-04-05 Commissariat A L'energie Atomique Stuctures magnétiques ouvertes
CN1121801A (zh) * 1994-08-16 1996-05-08 王魁武 高均匀度无涡流平板式核磁共振成像仪用永磁磁体
US5710511A (en) * 1996-03-14 1998-01-20 Western Atlas International, Inc. Method and apparatus for eddy current suppression

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0646806A1 (fr) * 1993-09-30 1995-04-05 Commissariat A L'energie Atomique Stuctures magnétiques ouvertes
CN1121801A (zh) * 1994-08-16 1996-05-08 王魁武 高均匀度无涡流平板式核磁共振成像仪用永磁磁体
US5710511A (en) * 1996-03-14 1998-01-20 Western Atlas International, Inc. Method and apparatus for eddy current suppression

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