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1. 发明授权

US06597170B1 Optimal excitation pulse shaping for multi-frequency measurements in NMR logging 失效
标题翻译：在NMR测井中进行多频测量的最佳激发脉冲整形
公开(公告)号：US06597170B1
公开(公告)日：2003-07-22
申请号：US09606998
申请日：2000-06-29
申请人： David Beard , Gregory Itskovich , Arcady Reiderman , Songhua Chen
发明人： David Beard , Gregory Itskovich , Arcady Reiderman , Songhua Chen
IPC分类号： G01V300
CPC分类号： G01V3/32 , G01N24/081
摘要： Pulse shaping is used for reducing the interference between echo trains of multiple frequency NMR logging applications in a gradient logging tool. The major contribution to the interference between different logging sequences comes from the sidelobes in the spectra of the excitation signal caused by modulating the RF signal with a square pulse. By shaping the tipping pulse in a CPMG pulse sequence, the interference between logging sequences at proximate frequencies is reduced. The shaped pulse may be a smooth function such as the Chebyshev function or it may be a composite of two rectangular pulses. In an alternate embodiment of the invention, the refocusing pulses are also shaped.
摘要翻译：脉冲整形用于减少梯度测井工具中多次NMR测井应用的回波列之间的干扰。对不同记录序列之间的干扰的主要贡献来自于通过用平方脉冲调制RF信号引起的激励信号的频谱中的旁瓣。通过以CPMG脉冲序列整形翻转脉冲，降低了接近频率下记录序列之间的干扰。成形脉冲可以是诸如切比雪夫功能的平滑功能，或者它可以是两个矩形脉冲的复合。在本发明的替代实施例中，再聚焦脉冲也被成形。

2. 发明申请

US20070075706A1 Method and apparatus for formation evaluation and borehole size determination 有权
标题翻译：用于地层评估和钻孔尺寸确定的方法和装置
公开(公告)号：US20070075706A1
公开(公告)日：2007-04-05
申请号：US11541227
申请日：2006-09-29
申请人： Songhua Chen , Carl Edwards , David Beard
发明人： Songhua Chen , Carl Edwards , David Beard
IPC分类号： G01V3/00
CPC分类号： G01V3/30 , G01V3/32
摘要： The quality factor of a NMR-antenna depends upon mud conductivity, formation resistivity and the borehole size. The Q of the antenna is measured. From measurement of one of formation conductivity or borehole size, the other can be determined.
摘要翻译： NMR天线的质量因素取决于泥浆导电性，地层电阻率和钻孔尺寸。测量天线的Q值。从测量地层导电率或钻孔尺寸之一，可以确定另一个。

3. 发明授权

US09658359B2 NMR tracking of injected fluids 有权
公开(公告)号：US09658359B2
公开(公告)日：2017-05-23
申请号：US14131815
申请日：2011-07-12
申请人： Ron Dirksen , Songhua Chen
发明人： Ron Dirksen , Songhua Chen
IPC分类号： G01V3/00 , G01V3/32 , E21B43/26 , E21B49/00
CPC分类号： G01V3/32 , E21B43/26 , E21B49/008
摘要： Formation testing systems and methods may inject fluids into a formation to initiate fractures and facilitate measurements of various formation properties. In accordance with certain disclosed embodiments, the injection tools are further provided with nuclear magnetic resonance (NMR) sensors to monitor the injected fluids and provide measurements of near-borehole fracture orientations and volumes. Contrast agents and/or magnetic resonance imaging (MRI) techniques may be employed. The fluid injection may occur via an extendible isolation pad, via a fracturing jet, or via an injection port in an isolated region of the borehole. The systems may employ pressure monitoring in conjunction with the NMR sensors to further enhance estimates of formation and fracture properties.

4. 发明授权

US08610431B2 NMR contrast logging 失效
标题翻译： NMR对比测井
公开(公告)号：US08610431B2
公开(公告)日：2013-12-17
申请号：US13012929
申请日：2011-01-25
申请人： Songhua Chen , Daniel Georgi
发明人： Songhua Chen , Daniel Georgi
IPC分类号： G01V3/00
CPC分类号： G01V3/32
摘要： An apparatus for estimating a property of an earth formation penetrated by a borehole, the apparatus includes: a carrier configured to be conveyed through the borehole; a nuclear magnetic resonance (NMR) instrument disposed at the carrier and configured to perform an NMR measurement on a volume sensitive to the NMR measurement; and a contrast agent disposed in the volume and comprising particles that form a suspension in a liquid, the suspension of particles being configured increase a magnetic field gradient of at least one earth formation material in the volume to change an NMR relaxation time constant of the at least one earth formation material; wherein the NMR measurement on the volume containing the at least one earth formation material and the contrast agent is used to estimate the property.
摘要翻译：一种用于估计由钻孔穿透的地层的性质的装置，所述装置包括：构造成被输送通过所述钻孔的载体; 设置在载体上并被配置为对对NMR测量敏感的体积进行NMR测量的核磁共振（NMR）仪器; 以及设置在体积中并包含在液体中形成悬浮液的颗粒的造影剂，构造的颗粒悬浮液增加体积中的至少一种地球形成材料的磁场梯度，以改变在该体积中的NMR弛豫时间常数至少一个地层材料; 其中使用包含至少一种地球形成材料和造影剂的体积上的NMR测量来估计该性质。

5. 发明授权

US08195399B2 Method of determining downhole formation grain size distribution using acoustic and NMR logging data 有权
标题翻译：使用声学和NMR测井数据确定井下形成粒度分布的方法
公开(公告)号：US08195399B2
公开(公告)日：2012-06-05
申请号：US12053988
申请日：2008-03-24
申请人： Mikhail N. Gladkikh , Songhua Chen , Jiansheng Chen
发明人： Mikhail N. Gladkikh , Songhua Chen , Jiansheng Chen
IPC分类号： G01V1/40 , G01V3/38
CPC分类号： G01V11/00 , G01V3/32 , G01V5/04
摘要： The grain size distribution of a pore-scale geometric model of a clastic earth formation are adjusted so that the NMR relaxation time distribution output of the model matches a measured NMR distribution, and an acoustic velocity output of the model matches a measured acoustic velocity (compressional and/or shear). Fluid drainage and imbibing can be simulated. Additional properties of the earth formation are predicted using the pore-scale model. The additional properties may be based on additional measurements of properties of a fluid in the formation.
摘要翻译：调整碎屑岩地层的孔隙尺度几何模型的粒度分布，使得模型的NMR弛豫时间分布输出与测量的NMR分布相匹配，并且模型的声速输出与测得的声速匹配（压缩和/或剪切）。可以模拟流体排水和吸水。使用孔隙尺度模型预测地层的附加属性。额外的性质可以基于地层中流体的性质的附加测量。

6. 发明申请

US20120101732A1 Integrated Source-Free Method and Apparatus for Porosity Determination: NMR Calibrated Acoustic Porosity 有权
标题翻译：用于孔隙度测定的无源源方法和设备：NMR校准的声孔率
公开(公告)号：US20120101732A1
公开(公告)日：2012-04-26
申请号：US13267140
申请日：2011-10-06
申请人： Chun Lan , Songhua Chen , Fabio Brambilla
发明人： Chun Lan , Songhua Chen , Fabio Brambilla
IPC分类号： G06F19/00
CPC分类号： G01N24/081
摘要： NMR porosity measurements made in a gas free-formation are used to calibrate acoustic measurements. The calibration parameters are then used in conjunction with estimates of shale content to provide improved estimates of formation porosity in shaly intervals which may include a gas.
摘要翻译：使用无气体形成的NMR孔隙度测量来校准声学测量。然后将校准参数与页岩含量的估计结合使用，以提供可能包括气体的泥质间隔中的地层孔隙度的改进估计。

7. 发明申请

US20120092007A1 NMR Flow Metering Using Velocity Selection and Remote Detection 有权
标题翻译：使用速度选择和远程检测的NMR流量计
公开(公告)号：US20120092007A1
公开(公告)日：2012-04-19
申请号：US12971740
申请日：2010-12-17
申请人： Lilong Li , Songhua Chen , Carl M. Edwards
发明人： Lilong Li , Songhua Chen , Carl M. Edwards
IPC分类号： G01R33/44 , G01F1/56
CPC分类号： G01N24/081 , G01F1/716 , G01F1/74 , G01N24/082 , G01R33/445
摘要： A method and apparatus for estimating a flow rate of a phase of a multiphase fluid is disclosed. In the first method, nuclei in the fluid are polarized over two distances and a measured magnetization gives the relative fraction of two components of the fluid for a selected velocity. In the second method, nuclei in the fluid are polarized over a specified distance and measurements of the decay of spin echo signals is used to give the relative fraction of two components of the fluid for the selected velocity.
摘要翻译：公开了一种用于估计多相流体的相的流量的方法和装置。在第一种方法中，流体中的核在两个距离上被极化，并且测量的磁化给出了所选流速的流体的两个分量的相对分数。在第二种方法中，流体中的核在一定距离上被极化，并且使用自旋回波信号衰减的测量值来给出所选速度的流体的两个分量的相对分数。

8. 发明授权

US08131469B2 Data acquisition and processing for invasion profile and gas zone analysis with NMR dual or multiple interecho spacing time logs 有权
标题翻译：采用核磁共振双重或多次间隔时间对数据进行数据采集和处理
公开(公告)号：US08131469B2
公开(公告)日：2012-03-06
申请号：US12245121
申请日：2008-10-03
申请人： Songhua Chen , Wei Shao
发明人： Songhua Chen , Wei Shao
IPC分类号： G01V1/40
CPC分类号： G01V3/32 , G01N24/081 , G01R33/50
摘要： A method for obtaining a parameter of interest related to an earth formation, the method including: obtaining nuclear magnetic resonance (NMR) data from an NMR tool investigating the earth formation with a plurality of pulse sequences of radio frequency energy, each pulse sequence having a unique frequency, a first train of pulses having a first interecho time (TE1) and a second train of pulses having a second interecho time (TE2) different from the first interecho time; relating the NMR data to a partial porosity at points to establish an NMR response model; solving the NMR response model to calculate the partial porosity at each of the points in the earth formation; summing the partial porosity for each of the points corresponding to each depth of investigation to provide a pore volume; and associating each pore volume with the corresponding depth of investigation to provide the parameter of interest.
摘要翻译：一种用于获得与地球相关的感兴趣参数的方法，所述方法包括：利用多个射频能量的脉冲序列从研究地层的NMR工具获得核磁共振（NMR）数据，每个脉冲序列具有唯一频率，具有第一相互作用时间（TE1）和第二脉冲序列的第一脉冲序列具有不同于第一相互间隔时间的第二相互作用时间（TE2）; 将NMR数据与点处的部分孔隙度相关联，以建立NMR响应模型; 解决NMR响应模型，计算地层中每个点的部分孔隙度; 将与每个调查深度相对应的每个点的部分孔隙率相加以提供孔体积; 并将每个孔体积与相应的调查深度相关联以提供感兴趣的参数。

9. 发明授权

US08115481B2 Method of discerning water from hydrocarbon fluids using downhole NMR instruments in petroleum reservoirs with formation brine 失效
标题翻译：使用地下盐水的石油储层中使用井下核磁共振仪器从烃类流体中分辨水的方法
公开(公告)号：US08115481B2
公开(公告)日：2012-02-14
申请号：US12177246
申请日：2008-07-22
申请人： Songhua Chen
发明人： Songhua Chen
IPC分类号： G01V3/00 , G01R33/20
CPC分类号： G01V3/32 , G01N24/081 , G01R33/3808 , Y02A90/344
摘要： A method for analytically separating properties of hydrocarbon materials from other materials in a downhole environment, the method including: performing nuclear magnetic resonance (NMR) measurements downhole; determining a signal for sodium-23 (23Na) from the NMR measurements; and associating the 23Na signal with the other materials. A computer program product, an apparatus and additional methods are provided.
摘要翻译：一种用于在井下环境中分析烃物质与其他材料的性质的方法，所述方法包括：在井下进行核磁共振（NMR）测量; 从NMR测量确定钠-23（23Na）的信号; 并将23Na信号与其他材料相关联。提供了一种计算机程序产品，装置和附加方法。

10. 发明授权

US07753119B2 In-situ heavy-oil reservoir evaluation with artificial temperature elevation 有权
标题翻译：人工温度升高的原位重油层评估
公开(公告)号：US07753119B2
公开(公告)日：2010-07-13
申请号：US10818873
申请日：2004-04-06
申请人： Songhua Chen , Daniel T. Georgi
发明人： Songhua Chen , Daniel T. Georgi
IPC分类号： E21B49/00 , G01V3/00
CPC分类号： G01V3/32
摘要： Many reservoirs of interest include heavy oil. In such reservoirs, partly at normal temperatures, many instruments commonly used for formation evaluation may not be able to distinguish between heavy oil and bound water in the formation. Passive or active heating is used to elevate the temperature of the fluids in the formation. At elevated temperatures, distinguishing between heavy oil and bound water is easier. Of particular interest is the increase in the resolvability of the transverse relaxation time T2 of NMR spin echo measurements. Additionally, the dielectric constant and the loss tangents of water and heavy oil show different temperature and frequency dependence.
摘要翻译：许多有意义的水库包括重油。在这种储层中，部分在正常温度下，通常用于地层评估的许多仪器可能无法区分地层中重油和结合水。被动或主动加热用于提高地层中流体的温度。在升高的温度下，区分重油和结合水更容易。特别感兴趣的是NMR自旋回波测量的横向弛豫时间T2的可分解性的增加。此外，水和重油的介电常数和损耗角正切表现出不同的温度和频率依赖性。

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