公开(公告)号：US5389877A

公开(公告)日：1995-02-14

申请号：US800339

申请日：1991-11-27

申请人： Abdurrahman Sezginer ,  Christian Straley

发明人： Abdurrahman Sezginer ,  Christian Straley

IPC分类号： G01R33/44 ,  G01V3/32 ,  G01V3/00

CPC分类号： G01N24/081 ,  G01V3/32

摘要： An NMR pulse sequence for use in a borehole logging tool includes a series of CPMG pulses according to:T.sub.r -90.degree..sub..+-.x -(t.sub.cp -180.degree..sub.y -t.sub.cp -echo.sub.j)where j is the index of CPMG echoes gathered, T.sub.r is wait time, t.sub.cp is the Carr-Purcell spacing. This pulse sequence is used to determine Bound Fluid Volume (BFV) which is subtracted from total porosity to yield Unbound Fluid Volume (UFV) of a formation surrounding the borehole. Measuring the BVF, the amount of rapidly relaxing fluid (less than 50 ms), is more efficient than measuring UFV (up to 2 secs), and is insensitive to motion of the logging tool.

摘要翻译： 用于钻孔测井工具的NMR脉冲序列包括一系列CPMG脉冲，它们根据：Tr-90°+/- x-（tcp-180°y-tcp-echoj），其中j是收集的CPMG回波的指数， Tr是等待时间，tcp是Carr-Purcell间隔。 该脉冲序列用于确定从总孔隙度中减去的结合流体体积（BFV），以产生围绕钻孔的地层的未结合流体体积（UFV）。 测量BVF，快速松弛液体的量（小于50 ms）比测量UFV（最多2秒）更有效，并且对测井工具的运动不敏感。

公开(公告)号：US5376884A

公开(公告)日：1994-12-27

申请号：US41643

申请日：1993-04-01

申请人： Abdurrahman Sezginer

发明人： Abdurrahman Sezginer

IPC分类号： G01R33/34 ,  G01R33/38 ,  G01R33/44 ,  G01V3/32 ,  G01V3/00

CPC分类号： G01R33/3808 ,  G01R33/34 ,  G01V3/32

摘要： The disclosure invention is directed to a nuclear magnetic resonance measurement apparatus that can be utilized in a logging device which operates generally centrally in a borehole, and has a generally circumferential region of investigation, but which permits usage of relatively powerful permanent magnets, such as rare-earth magnets, that are not permeable to the RF magnetic field. This is achieved by employing side-by-side spaced apart elongated magnets, and an RF current loop in the region between the magnets. In a disclosed embodiment, the magnets are each in the shape of a segment of a cylinder, and the respective axes of elongation of the magnets are parallel. The magnets have respective casings with electrically conductive surfaces, and the RF current loop includes at least a portion of the conductive surfaces of the magnet casings.

摘要翻译： 本发明涉及一种核磁共振测量装置，其可以用于通常在钻孔中心操作的测井装置中，并且具有大致圆周的调查区域，但是允许使用相对强大的永磁体，例如罕见的 - 磁场不能被射频磁场渗透。 这通过采用并排分开的细长磁体和在磁体之间的区域中的RF电流回路来实现。 在公开的实施例中，磁体各自为圆柱体的形状，并且磁体的相应的伸长轴线是平行的。 磁体具有带导电表面的各自的壳体，并且RF电流回路包括磁体壳体的至少一部分导电表面。

公开(公告)号：US5363041A

公开(公告)日：1994-11-08

申请号：US999248

申请日：1992-12-31

申请人： Abdurrahman Sezginer

发明人： Abdurrahman Sezginer

IPC分类号： G01R33/44 ,  G01R33/46 ,  G01R33/50 ,  G01V3/32 ,  G01R33/20

CPC分类号： G01V3/32 ,  G01N24/081 ,  G01R33/4616 ,  G01R33/50

摘要： A borehole logging tool comprises a Nuclear Magnetic Resonance (NMR) tool and is pulsed according to a selected sequence. An interpretation is performed which involves a singular value decomposition and compression of data obtained by the tool. The compressed data is then subjected to a nonegative, linear least square fit to obtain a distribution function. The distribution function is used in determining bound fluid volume, unbound fluid volume, total porosity, spin-lattice relaxation time, spin-spin relaxation time, and mean relaxation time using only the pulse NMR tool.

摘要翻译： 井眼测井工具包括核磁共振（NMR）工具，并根据所选序列脉冲。 执行解释，其涉及由工具获得的数据的奇异值分解和压缩。 然后将经压缩的数据进行非负的线性最小二乘拟合以获得分布函数。 分布函数用于仅使用脉冲NMR工具确定结合流体体积，未结合流体体积，总孔隙率，自旋晶格弛豫时间，自旋 - 自旋弛豫时间和平均松弛时间。

公开(公告)号：US5023551A

公开(公告)日：1991-06-11

申请号：US452903

申请日：1989-12-19

申请人： Robert L. Kleinberg ,  Abdurrahman Sezginer ,  Masafumi Fukuhara

发明人： Robert L. Kleinberg ,  Abdurrahman Sezginer ,  Masafumi Fukuhara

IPC分类号： G01R33/34 ,  G01R33/38 ,  G01R33/44 ,  G01V3/32

CPC分类号： G01V3/32 ,  G01N24/081 ,  G01R33/341 ,  G01R33/3808 ,  G01R33/3671 ,  G01R33/443 ,  G01R33/448

摘要： An NMR pulse sequence for use in the borehole environment is provided which combines a modified fast inversion recovery (FIR) pulse sequence with a series of more than ten, and typically hundreds, of CPMG pulses according to[W.sub.i -180-.tau..sub.i -90-(t.sub.cp -180-t.sub.cp -echo).sub.j ].sub.iwhere j is the index of the CPMG echoes gathered, i is the index of the wait times in the pulse sequence, W.sub.i are the wait times, i are the recovery times before the CPMG pulses, and tcp is the Carr-Purcell spacing. Measurements are made of the signals induced in the formation as a result of the magnetic fields. Determinations of M.sub.o and/or T1 are then made from the measurements according to relationships which relate Mp.sub.o, T1 and T2 to the signal magnitude. Other relationships which provide stretched exponentials or multiple exponentials can also be used. From the M.sub.o and/or T1 determinations, formation parameters such as porosity and permeability may be derived according to equations known in the art. In obtaining the most accurate determinations of formation parameters in the least amount of time, the various pulse sequence parameters (I, J, W.sub.i, and .tau..sub.i) are optimized prior to logging. Additional accuracy is obtained by integrating a gated portion of the echoes rather than by measuring amplitude, and by utilizing a phase alternated CPMG sequence in repetitive measurements in order to eliminate baseline shift error.

摘要翻译： 提供了一种用于井眼环境中的NMR脉冲序列，其将经修改的快速反转恢复（FIR）脉冲序列与根据[Wi-180-τi-90的几十个并且通常为数百个CPMG脉冲 - （tcp-180-tcp-echo）j] i其中j是收集的CPMG回波的索引，i是脉冲序列中的等待时间的索引，Wi是等待时间，i是之前的恢复时间 CPMG脉冲，tcp是Carr-Purcell间隔。 测量由于磁场而在地层中感应的信号。 然后根据将Mpo，T1和T2与信号幅度相关的关系从测量值确定Mo和/或T1。 也可以使用提供拉伸指数或多指数的其他关系。 根据Mo和/或T1测定，可以根据本领域已知的方程式导出诸如孔隙率和渗透率的形成参数。 在最少量的时间内获得最准确的地层参数确定时，各种脉冲序列参数（I，J，Wi和τi）在记录之前被优化。 通过集成回波的门控部分而不是通过测量振幅，并且通过在重复测量中利用相位交替的CPMG序列来获得额外的精度，以消除基线偏移误差。