公开(公告)号：US06570381B1

公开(公告)日：2003-05-27

申请号：US09276049

申请日：1999-03-25

申请人： Peter Speier ,  Krishnamurthy Ganesan ,  Boqin Sun ,  Reza Taherian ,  Christian Straley

发明人： Peter Speier ,  Krishnamurthy Ganesan ,  Boqin Sun ,  Reza Taherian ,  Christian Straley

IPC分类号： G01V300

CPC分类号： G01V3/32 ,  G01N24/081

摘要： The present invention relates generally to a nuclear magnetic resonance apparatus and method for substantially eliminating the effects of phase coherent acoustic ringing in borehole logging. A series of cycles of measurement pulse sequences are applied to the formation surrounding the borehole. Each pulse sequence includes an RF excitation pulse and several RF refocusing pulses. Spin echoes are received that contain spurious ringing signals from the excitation and refocusing pulses. Spin echo signals from corresponding spin echoes of each cycle are combined and substantially cancel the spurious ringing from the excitation and refocusing pulses of the pulse sequences.

摘要翻译： 本发明一般涉及一种用于基本消除井眼测井中的相位相干声环的影响的核磁共振装置和方法。 将测量脉冲序列的一系列循环应用于围绕钻孔的地层。 每个脉冲序列包括一个RF激励脉冲和几个RF重聚焦脉冲。 接收到包含来自激发和重聚焦脉冲的杂散振铃信号的自旋回波。 来自每个周期的相应自旋回波的旋转回波信号被组合，并且基本上抵消来自脉冲序列的激发和重聚焦脉冲的杂散振铃。

公开(公告)号：US06498484B1

公开(公告)日：2002-12-24

申请号：US09594640

申请日：2000-06-15

申请人： Boqin Sun ,  Reza Taherian

发明人： Boqin Sun ,  Reza Taherian

IPC分类号： G01V300

CPC分类号： G01V3/32 ,  G01N24/081

摘要： A method for reducing ringing in nuclear magnetic resonance measurements is disclosed. The method includes inducing a static magnetic field in a sensitive volume to orient nuclear magnetic spins of nuclei in the sensitive volume. The nuclear spins are reoriented by a first selected angle. An amplitude of the static magnetic field is then adjusted to cause a first selected phase shift in a spin echo signal measured subsequently to the reorienting by the first angle. The spins are then reoriented by a second selected angle, and a first spin echo signal is detected. After a selected wait time, reorienting by the first selected angle is repeated. Adjusting the amplitude of the static magnetic field is then repeated to cause a second selected phase shift in a subsequently measured spin echo. The first and second selected phase shifts have a difference between them of an odd numbered multiple of 180 degrees. Reorienting by the second selected and detecting a second spin echo signal are then repeated. Finally, a difference between the first spin echo signal and the second spin echo signal is determined. In one embodiment, the measuring of the first and second spin echoes is repeated a selected number of times, and the difference is calculated between time corresponding ones of the first and second spin echoes.

摘要翻译： 公开了一种减少核磁共振测量中振铃的方法。 该方法包括在敏感体积中诱导静磁场以定向敏感体积中的核的核磁自旋。 核旋转由第一选定角度重新定向。 然后调整静态磁场的振幅，以使得随着重新定向第一角度测量的自旋回波信号中的第一选择的相移。 然后将自旋重新定向第二选定角度，并且检测第一自旋回波信号。 在选定的等待时间之后，重新定向第一选定角度的方向。 然后重复调整静态磁场的振幅，以在随后测量的自旋回波中引起第二选择的相移。 第一和第二选择的相移在180度的奇数倍数之间具有差异。 然后重复第二选择的重定向并检测第二自旋回波信号。 最后，确定第一自旋回波信号和第二自旋回波信号之间的差异。 在一个实施例中，重复第一和第二自旋回波的测量次数，并且在第一和第二自旋回波的时间对应的时间之间计算差值。

公开(公告)号：US06781371B2

公开(公告)日：2004-08-24

申请号：US10064994

申请日：2002-09-06

申请人： Reza Taherian ,  Boqin Sun ,  Abdurrahman Sezginer

发明人： Reza Taherian ,  Boqin Sun ,  Abdurrahman Sezginer

IPC分类号： G01V300

CPC分类号： G01N24/081 ,  G01V3/32

摘要： A high vertical resolution antenna design is provided for use in an NMR measurement apparatus. Multiple coils are situated along the length of a magnet. A primary coil is energized to cause an oscillating magnetic field in a portion of earth formation surrounding a borehole. A secondary coil having smaller dimensions than the primary coil is operated to receive spin echoes from a depth of investigation associated with the secondary coil. A distance sufficient to minimize electrical coupling separates the coils. The separation distance can be reduced by selecting a secondary coil with orthogonal polarization to the primary coil. Alternatively, a cross coil configuration can be implemented where the orthogonal secondary coil at least partially overlaps the primary coil, thereby reducing the overall length necessary for the polarizing magnet.

摘要翻译： 提供了用于NMR测量装置的高垂直分辨率天线设计。 多个线圈沿着磁体的长度设置。 初级线圈被通电以在围绕钻孔的地层的一部分中产生振荡磁场。 操作具有小于初级线圈的尺寸的次级线圈以从与次级线圈相关联的调查深度接收自旋回波。 足以使电耦合最小化的距离分离线圈。 可以通过选择具有与初级线圈的正交极化的次级线圈来减小间隔距离。 或者，可以实现交叉线圈配置，其中正交次级线圈至少部分地与初级线圈重叠，从而减小极化磁体所需的总长度。

公开(公告)号：US6166543A

公开(公告)日：2000-12-26

申请号：US936892

申请日：1997-09-25

申请人： Abdurrahman Sezginer ,  Pabitra N. Sen ,  Mohammad Reza Taherian ,  Boqin Sun

发明人： Abdurrahman Sezginer ,  Pabitra N. Sen ,  Mohammad Reza Taherian ,  Boqin Sun

IPC分类号： G01R33/44 ,  G01V3/32 ,  G01U3/00

CPC分类号： G01V3/32 ,  G01N24/081

摘要： The present invention relates generally to an apparatus and method for measuring nuclear magnetic resonance properties of an earth formation traversed by a borehole by generating gradient-echoes. The measurement can be made while drilling or using a wireline tool. The apparatus applies a static magnetic field, B.sub.a, in a volume of the formation which polarizes the nuclei of hydrogenous connate fluids within the formation. The apparatus applies a second magnetic field, B.sub.b, in a volume of the formation. The magnetic fields B.sub.a and B.sub.b are substantially orthogonal in the volume of the formation. A change in the polarity of the magnetic field, B.sub.b, reverses the direction of precession of the nuclei thereby generating a train of gradient-echoes. Each gradient-echo signal is transformed into the frequency domain and the signal frequency is mapped to a radial position in the volume of the formation in order to generate an image of the formation. Various properties of the formation, such as the effective diffusion coefficient of the formation fluid, longitudinal relaxation time, spin--spin relaxation time, and porosity can be estimated from the train of gradient-echoes.

摘要翻译： 本发明一般涉及通过产生梯度回波来测量由钻孔穿过的地层的核磁共振特性的装置和方法。 可以在钻孔或使用有线工具时进行测量。 该装置在地层的体积中施加静磁场Ba，其使地层内的含氢原生液体的核极化。 该装置在地层的体积中施加第二磁场Bb。 磁场Ba和Bb在地层的体积中基本正交。 磁场极性的变化Bb反转核的进动方向，从而产生一系列梯度回波。 每个梯度回波信号被变换成频域，并且信号频率被映射到地层体积中的径向位置，以便产生地层的图像。 可以从梯度回波序列估计地层的各种性质，例如地层流体的有效扩散系数，纵向松弛时间，自旋 - 自旋弛豫时间和孔隙度。

公开(公告)号：US06522137B1

公开(公告)日：2003-02-18

申请号：US09605805

申请日：2000-06-28

申请人： Boqin Sun ,  Reza Taherian ,  Abdurrahman Sezginer ,  Steven F. Crary

发明人： Boqin Sun ,  Reza Taherian ,  Abdurrahman Sezginer ,  Steven F. Crary

IPC分类号： G01V300

CPC分类号： G01V3/32 ,  G01N24/081

摘要： A downhole NMR measurement apparatus for use in a borehole includes at least one magnet, at least one RF transmission coil, at least one gradient coil and circuitry. The magnet(s) establish a magnetic field in a region of a formation that at least partially surrounds the measurement apparatus. The RF transmission coils(s) transmit RF pulses pursuant to an NMR pulse sequence into the region to, in combination with the magnetic field, induce the generation of spin echo signals from a resonance volume within the region. The gradient coil(s) establish a pulsed gradient field in the resonance volume, and the circuitry is coupled to the gradient coil(s) to control the generation of the pulsed gradient field to phase encode the spin echo signals for purposes of high resolution imaging of the formation.

摘要翻译： 用于钻孔的井下NMR测量装置包括至少一个磁体，至少一个RF传输线圈，至少一个梯度线圈和电路。 磁体在至少部分地围绕测量装置的地层区域中建立磁场。 RF传输线圈根据NMR脉冲序列将RF脉冲发送到与该磁场相结合的区域中，从该区域内的共振体积引起自旋回波信号的产生。 梯度线圈在谐振体积中建立脉冲梯度场，并且电路耦合到梯度线圈以控制脉冲梯度场的产生以对自旋回波信号进行相位编码，以用于高分辨率成像 的形成。

公开(公告)号：US6121774A

公开(公告)日：2000-09-19

申请号：US102719

申请日：1998-06-22

申请人： Boqin Sun ,  Reza Taherian

发明人： Boqin Sun ,  Reza Taherian

IPC分类号： G01R33/44 ,  G01R33/46 ,  G01V3/32 ,  G01V3/00

CPC分类号： G01V3/32 ,  G01N24/081 ,  G01R33/4608

摘要： The present invention relates generally to a method for eliminating ringing while measuring nuclear magnetic resonance properties of an earth formation traversed by a borehole. The measurement can be made while drilling or using a wireline tool. During a first time period of a single pulse sequence, the measurement includes the desired spin-echoes and the undesired effects, that is, ringing, measurement noise, and baseline shift. During a second time period of the single pulse sequence, the spin-echoes are eliminated but not the undesired effects. Using the signal collected during the second time period, the signals measured during the first time period are corrected to eliminate the ringing component, measurement noise, and baseline shift.

摘要翻译： 本发明一般涉及在测量由钻孔穿过的地层的核磁共振特性的同时消除振铃的方法。 可以在钻孔或使用有线工具时进行测量。 在单个脉冲序列的第一时间段期间，测量包括期望的自旋回波和不期望的效应，即振铃，测量噪声和基线偏移。 在单个脉冲序列的第二时间段期间，自旋回波被消除，但不是不期望的效应。 使用在第二时间段期间收集的信号，校正在第一时间段期间测量的信号以消除振铃分量，测量噪声和基线偏移。

公开(公告)号：US09851315B2

公开(公告)日：2017-12-26

申请号：US14567364

申请日：2014-12-11

申请人： Zheng Yang ,  Boqin Sun ,  Ajit Ramchandra Pradhan ,  Hussein Alboudwarej ,  Dengen Zhou

发明人： Zheng Yang ,  Boqin Sun ,  Ajit Ramchandra Pradhan ,  Hussein Alboudwarej ,  Dengen Zhou

IPC分类号： G01N24/08 ,  G01N33/24 ,  G01V3/32 ,  G01R33/50 ,  G01R33/44

CPC分类号： G01N24/081 ,  G01N33/241 ,  G01R33/445 ,  G01R33/448 ,  G01V3/32

摘要： A method for determining the concentration of asphaltenes in a solution is described. A model is first established for estimating the concentration of asphaltenes in a solution based on multiple samples of solutions of asphaltenes in the solvent in which the concentrations are known. The multiple samples have varying concentrations of asphaltenes. The diffusivity and relaxation time are measured for each sample using two-dimensional NMR. The ratio of diffusivity to relaxation time for each sample is then calculated. A linear equation is determined to fit the relationship between the ratio of diffusivity to relaxation time and the asphaltene concentration by weight for the multiple samples, thus creating the model. For a given solution sample for which the concentration of asphaltenes is desired to be determined, diffusivity and relaxation time are determined using two-dimensional NMR, and the ratio of diffusivity to relaxation time is calculated. This ratio is then used with the model, so that the linear equation can be solved for the asphaltene concentration in the given solution sample.

公开(公告)号：US20160290942A1

公开(公告)日：2016-10-06

申请号：US14673043

申请日：2015-03-30

申请人： Haijing Wang ,  Scott Jeffrey Seltzer ,  Boqin Sun

发明人： Haijing Wang ,  Scott Jeffrey Seltzer ,  Boqin Sun

IPC分类号： G01N24/08

CPC分类号： G01N24/081 ,  G01N24/082 ,  G01R33/448

摘要： A disclosed method for characterizing gas adsorption on a rock sample includes: measuring a nuclear magnetic resonance (NMR) response of the rock as a function of surrounding gas pressure along an isotherm; transforming the NMR response to obtain a Langmuir pressure distribution of gas adsorption on the rock sample; and displaying the Langmuir pressure distribution. The Langmuir pressure distribution may be shown in one dimension (e.g., contribution to signal response versus Langmuir pressure), or may be combined with additional pressure-dependencies such as spin-lattice relaxation time (T1), spin-spin relaxation time (T2), and chemical shift (δ) to form a multi-dimensional distribution. The method can further include: identifying peaks in the Langmuir pressure distribution; and associating a gas storage mechanism and capacity with each peak. It may still further include: exposing the rock sample to a treatment fluid to obtain an altered sample; repeating said measuring and transforming operations with the altered sample; and comparing the Langmuir pressure distributions to determine effects of the treatment.

摘要翻译： 用于表征岩石样品上的气体吸附的公开方法包括：测量沿着等温线的围绕气体压力的函数的岩石的核磁共振（NMR）响应; 转化NMR响应，获得岩石样品上气体吸附的Langmuir压力分布; 并显示Langmuir压力分布。 Langmuir压力分布可以在一个维度上显示（例如，对信号响应对Langmuir压力的贡献），或者可以与额外的压力依赖性组合，例如自旋 - 晶格弛豫时间（T1），自旋 - 自旋弛豫时间（T2） ，和化学位移（δ）形成多维分布。 该方法还可以包括：识别Langmuir压力分布中的峰值; 并将气体存储机构和容量与每个峰值相关联。 它还可以进一步包括：将岩石样品暴露于处理液以获得改变的样品; 用改变的样品重复所述测量和变换操作; 并比较Langmuir压力分布来确定治疗效果。

公开(公告)号：US09291690B2

公开(公告)日：2016-03-22

申请号：US13530766

申请日：2012-06-22

申请人： Marcus Oliver Wigand ,  Boqin Sun

发明人： Marcus Oliver Wigand ,  Boqin Sun

IPC分类号： G01N24/08 ,  G01R33/46 ,  A47J47/14 ,  A45C11/20

CPC分类号： G01R33/4633 ,  A45C11/20 ,  A47J47/14 ,  G01N24/081

摘要： Molecular structures of organic molecules in a geological formation are determined. The organic molecules may include kerogen, coal, and/or other organic molecules. In particular, the technique implemented may operate to convert nuclear magnetic resonance data into a multi-dimensional space that permits identification of molecular structures through comparisons of intensity information across the multi-dimensional space with a cutoff map of the space. This may not only simplify the identification of molecular structures of the organic molecules, but also use exact mathematical model for mixture samples to derive both structural and dynamic parameters plus their variation.

摘要翻译： 确定地质构造中有机分子的分子结构。 有机分子可以包括油母质，煤和/或其它有机分子。 特别地，所实施的技术可以操作以将核磁共振数据转换为多维空间，其允许通过多维空间的强度信息与空间的截止图比较来识别分子结构。 这可能不仅简化了有机分子的分子结构的鉴定，而且还使用混合样品的精确数学模型来导出结构和动态参数加上它们的变化。

公开(公告)号：US09244188B2

公开(公告)日：2016-01-26

申请号：US13565994

申请日：2012-08-03

申请人： Boqin Sun ,  Emmanuel Toumelin

发明人： Boqin Sun ,  Emmanuel Toumelin

IPC分类号： G01V3/14

CPC分类号： G01V3/14 ,  Y02A90/344

摘要： A nuclear magnetic resonance relaxation time cutoff between results for a bound-water index of rock and a free-fluid index of the rock is determined. The determination is made based on measured and predicted values for permeability and/or wettability over a set of core plugs. The determination does not require a nuclear magnetic resonance operation performed on the core plugs under irreducible water saturation.

摘要翻译： 确定岩石的结合水指数和岩石的自由流体指数的结果之间的核磁共振弛豫时间截断。 基于在一组芯塞上的渗透性和/或润湿性的测量值和预测值进行测定。 该测定不需要在不可约的水饱和度下对芯​​塞执行核磁共振操作。