公开(公告)号：US06600316B2

公开(公告)日：2003-07-29

申请号：US10164917

申请日：2002-06-06

申请人： Songhua Chen ,  Dan Georgi ,  Thomas Kruspe

发明人： Songhua Chen ,  Dan Georgi ,  Thomas Kruspe

IPC分类号： G01V300

CPC分类号： G01R33/50 ,  G01V3/32

摘要： Nuclear magnetic resonance measurement of a medium are made using a tool with a static magnetic field having a gradient. The nuclear spins of the medium are magnetically polarized using the static magnetic field. Data are acquired from at least three sensitive volumes of the medium using an interleaved sequence of pulses at three different non-overlapping frequencies. At each frequency, a number of sub-sequences of a saturation pulse, a recovery pulse and at least one refocusing pulse are used. The saturation times between the saturation pulse and the recovery pulse for the sub-sequences are selected from a distribution of values between a minimum time to a maximum time to enable determination of T1 and T2 spectra over a wide range of values. Repetitions of sub-sequences having the same saturation at one or more frequencies may be carried out with phase alternation of the recovery pulse phases.

公开(公告)号：US07032661B2

公开(公告)日：2006-04-25

申请号：US10404408

申请日：2003-04-01

申请人： Dan Georgi ,  Thomas Kruspe ,  Matthias Meister

发明人： Dan Georgi ,  Thomas Kruspe ,  Matthias Meister

IPC分类号： E21B47/00

CPC分类号： G01V3/32 ,  E21B49/00 ,  E21B49/08 ,  E21B49/087 ,  G01N24/081 ,  G01R33/281

摘要： Formation testing, resistivity and NMR measurements are used concurrently to determine a relative permeability representative of a formation surrounding the borehole. A method and apparatus is provided for accurate determination of the relative permeability for a formation by measuring saturation levels in a region of interest determined from resistivity or NMR readings versus time during formation draw down pressure testing. The method and apparatus determines and effective permeability over time for various saturation levels to determine the relative permeability for the formation at each saturation level and also enables determination of the efficacy of utilizing completion fluids in the formation to increase formation productivity. The method and apparatus enables more accurate determination of effective permeability and the irreducible saturation level. The method and apparatus also provides for determination of whether a pad is sealed properly against a borehole wall and determines if a probe is clogged.

摘要翻译： 同时使用地层测试，电阻率和NMR测量来确定代表钻孔周围地层的相对磁导率。 提供了一种方法和装置，用于通过测量在电阻率或NMR读数相对于在地层抽取压力测试期间的时间确定的感兴趣区域中的饱和水平来精确地确定地层的相对磁导率。 该方法和装置确定各种饱和水平随时间的有效渗透率，以确定在每个饱和水平下地层的相对渗透率，并且还能够确定在地层中利用完井流体以提高地层生产力的功效。 该方法和装置能够更准确地确定有效磁导率和不可约饱和水平。 该方法和装置还提供确定垫是否适当地密封在钻孔壁上并确定探针是否堵塞。