公开(公告)号：US20100328544A1

公开(公告)日：2010-12-30

申请号：US12603877

申请日：2009-10-22

申请人： Alan Hendrickson ,  David Trager ,  Mitch Reid ,  Li Gao ,  John Khoury

发明人： Alan Hendrickson ,  David Trager ,  Mitch Reid ,  Li Gao ,  John Khoury

IPC分类号： H04N5/455 ,  H04L27/08

CPC分类号： H04N5/46 ,  H03J1/0008 ,  H04N5/455 ,  H04N5/50 ,  H04N21/4263

摘要： According to one aspect, a mixed-signal tuner for analog and digital TV reception incorporates a demodulator for analog TV, employing various features for resolving limitations of the analog circuitry and for achieving compatibility with various global TV standards. Such features, which may be present in one or more embodiments, include the use of a variable sample rate in all digital clocks for frequency planning, and use of a microcontroller (MCU) to control various circuitry of the tuner.

公开(公告)号：US20100182161A1

公开(公告)日：2010-07-22

申请号：US12090105

申请日：2007-04-28

申请人： Carl A. Robbins ,  Eugene Linyaev ,  Li Gao

发明人： Carl A. Robbins ,  Eugene Linyaev ,  Li Gao

IPC分类号： G01V3/00

CPC分类号： G01V11/002 ,  E21B47/122 ,  E21B47/14

摘要： Various electromagnetic LWD telemetry systems are disclosed having a wireless repeater positioned on or near the seabed. The wireless repeater receives and demodulates electromagnetic uplink signals and retransmits the uplink signals from the seabed as electromagnetic or acoustic signals. A receiver on the drilling platform or suspended from the water's surface receives the uplink signal and forwards it to a facility for processing and storage. In some embodiments, the wireless repeater takes the form of a sub threaded inline with the drill string with an electromagnetic signal sensor positioned inside the drill string. In other embodiments, the wireless repeater takes the form of a unit that rests on the seabed with electromagnetic signal sensors inserted into the sea bottom.

摘要翻译： 公开了各种电磁LWD遥测系统，其具有位于海床上或附近的无线中继器。 无线中继器接收和解调电磁上行信号，并将来自海底的上行链路信号作为电磁信号或声信号进行重传。 钻井平台上的接收器或从水面悬吊的接收器接收上行链路信号并将其转发到设备进行处理和存储。 在一些实施例中，无线中继器采用位于钻柱内部的电磁信号传感器与钻柱一起进行子螺纹内联的形式。 在其他实施例中，无线中继器采用放置在海床上的单元的形式，其中电磁信号传感器插入海底。

公开(公告)号：US07750808B2

公开(公告)日：2010-07-06

申请号：US11124030

申请日：2005-05-06

申请人： James Masino ,  Li Gao ,  Chris Golla ,  Paul F. Rodney

发明人： James Masino ,  Li Gao ,  Chris Golla ,  Paul F. Rodney

IPC分类号： G08B13/14 ,  E21B47/01

CPC分类号： E21B47/12 ,  E21B47/124

摘要： Data retrieval tags, drillstring communications systems and methods, and computer programs are disclosed. The data retrieval tag includes an insulator substrate, at least one analog memory cell disposed on the insulator substrate and an antenna coupled to the analog memory.

摘要翻译： 公开了数据检索标签，钻柱通信系统和方法以及计算机程序。 数据检索标签包括绝缘体衬底，设置在绝缘体衬底上的至少一个模拟存储器单元和耦合到模拟存储器的天线。

公开(公告)号：US20060250243A1

公开(公告)日：2006-11-09

申请号：US11124030

申请日：2005-05-06

申请人： James Masino ,  Li Gao ,  Chris Golla ,  Paul Rodney

发明人： James Masino ,  Li Gao ,  Chris Golla ,  Paul Rodney

IPC分类号： G08B13/14

CPC分类号： E21B47/12 ,  E21B47/124

摘要： Data retrieval tags, drillstring communications systems and methods, and computer programs are disclosed. The data retrieval tag includes an insulator substrate, at least one analog memory cell disposed on the insulator substrate and an antenna coupled to the analog memory.

摘要翻译： 公开了数据检索标签，钻柱通信系统和方法以及计算机程序。 数据检索标签包括绝缘体衬底，设置在绝缘体衬底上的至少一个模拟存储器单元和耦合到模拟存储器的天线。

公开(公告)号：US20060106212A1

公开(公告)日：2006-05-18

申请号：US10988688

申请日：2004-11-15

申请人： Rawle Hollingsworth ,  Li Gao

发明人： Rawle Hollingsworth ,  Li Gao

IPC分类号： A61K31/5415 ,  C07D498/04

CPC分类号： C07D513/04

摘要： A process for producing 2-thiaquiolizidines which are glycosidase and glycosyltransferase inhibitors is described. The compounds are of the formula: where x is 0 to 3.

摘要翻译： 描述了制备作为糖苷酶和糖基转移酶抑制剂的2-硫代亚氨基的方法。 化合物具有下式：其中x为0至3。

公开(公告)号：US06727706B2

公开(公告)日：2004-04-27

申请号：US09925997

申请日：2001-08-09

申请人： Li Gao ,  Stanley C. Gianzero

发明人： Li Gao ,  Stanley C. Gianzero

IPC分类号： G01V318

CPC分类号： G01V3/28

摘要： A method is disclosed for using a triad induction tool to identify the formation strike and dip angles. The method can be performed in real time. In one embodiment, the method includes: (1) measuring a magnetic coupling between transmitter coils and receiver coils of a tool in the borehole; (2) obtaining from the measured coupling a strike angle between the tool and the formation; (3) applying a rotational transformation to the coupling measurements to correct for the strike angle; and (4) applying a predetermined set of rotational transformations to the coupling to determine coupling term values as a function of rotation angle. A least-squares curve fit or a Hough transform of the derivative of the coupling term values with respect to position may be used to identify the dip angle.

摘要翻译： 公开了一种使用三元组感应工具来识别地层撞击和倾角的方法。 该方法可以实时执行。 在一个实施例中，该方法包括：（1）测量钻孔中工具的发射器线圈和接收器线圈之间的磁耦合; （2）从测量的耦合获得工具与地层之间的冲击角; （3）将旋转变换应用于耦合测量以校正冲击角; 以及（4）将预定的一组旋转变换应用于所述耦合以确定作为旋转角度的函数的耦合项值。 可以使用最小二乘法曲线拟合或耦合项值的相对于位置的导数的霍夫变换来识别倾角。

公开(公告)号：US06393364B1

公开(公告)日：2002-05-21

申请号：US09583184

申请日：2000-05-30

申请人： Li Gao ,  Stanley C. Gianzero

发明人： Li Gao ,  Stanley C. Gianzero

IPC分类号： G01V140

CPC分类号： G01V3/38 ,  E21B47/026 ,  G01V3/28

摘要： A method is disclosed for the determination of horizontal resistivity, vertical resistivity, dip and strike angles of anisotropic earth formations surrounding a wellbore. Electromagnetic couplings among a plural of triad transmitters and triad receivers are measured. Each triad transmitter/receiver consists of coil windings in three mutually orthogonal axes. These measured signals are used to generate initial estimates of the dip angle and strike angle of the formation as well as the anisotropy coefficient and the horizontal resistivity of the formation. An iterative algorithm is then applied using these quantities to finally arrive at more accurate estimates that approach the true values in the formation.

摘要翻译： 公开了一种用于确定围绕井筒的各向异性地层的水平电阻率，垂直电阻率，倾角和撞击角的方法。 测量多个三端发射器和三电平接收器之间的电磁耦合。 每个三元组发送器/接收器由三个相互正交的轴线圈绕组组成。 这些测量信号用于产生地层的倾角和撞击角以及地层的各向异性系数和水平电阻率的初始估计。 然后使用这些量来应用迭代算法，以最终得到接近地层中真实值的更准确的估计。

公开(公告)号：US6025769A

公开(公告)日：2000-02-15

申请号：US723444

申请日：1996-10-07

申请人： Ching-wu Chu ,  Yuyi Xue ,  Li Gao ,  Ruling Meng ,  Diego Alberto Ramirez

发明人： Ching-wu Chu ,  Yuyi Xue ,  Li Gao ,  Ruling Meng ,  Diego Alberto Ramirez

IPC分类号： H01F6/00 ,  H01F1/00

CPC分类号： H01F6/00

摘要： A trapped field magnet formed of a high temperature type II superconductor material is disclosed. The trapped field magnet is formed of a plurality of relatively small, single-grain superconductive elements. Optimal shaped of these elements is in a regular truncated cone wherein the half cone angle is 55.degree., and the optimal orientation of each single-grain superconducting elements is an angle of .phi..sub.m with respect to the axis perpendicular to the upper and lower surface of the element, wherein the .phi..sub.m =3 sin .theta. cos .theta./(3 cos.sup.2 .theta.-1) and .theta. determines the location of the element.

摘要翻译： 公开了由高温II型超导体材料形成的俘获场磁体。 捕获的场磁体由多个相对较小的单晶超导元件形成。 这些元件的最佳形状为正锥形锥形，其中半锥角为55°，并且每个单晶超导元件的最佳取向相对于垂直于上表面和下表面的轴的角度 元素，其中phi =3sinθcosθ/（3cos2θ-1）和θ决定元件的位置。

公开(公告)号：US10209390B2

公开(公告)日：2019-02-19

申请号：US14889977

申请日：2013-08-05

申请人： Wei Zhang ,  Lizheng Zhang ,  Li Gao ,  Burkay Donderici

发明人： Wei Zhang ,  Lizheng Zhang ,  Li Gao ,  Burkay Donderici

IPC分类号： G01V3/38 ,  G01N27/06 ,  G01V3/28 ,  G01N33/28 ,  G01N27/02 ,  G01N27/08 ,  E21B49/08

摘要： An apparatus includes a helical flow tube in a formation testing tool. A current injector injects an electromagnetic current into the flow tube. A receiver coil is positioned to produce a receiver coil signal in response to the electromagnetic current. A processor is coupled to the receiver coil to calculate a conductivity of a fluid flowing through the flow tube based on the receiver coil signal.

公开(公告)号：US09822634B2

公开(公告)日：2017-11-21

申请号：US14380005

申请日：2012-02-22

申请人： Li Gao

发明人： Li Gao

IPC分类号： G01V3/00 ,  E21B47/16

CPC分类号： E21B47/16

摘要： Specific embodiments of disclosed downhole telemetry systems and methods employ time-reversal pre-equalization. One downhole telemetry system embodiment includes an acoustic transducer and a digital signal processor. The acoustic transducer transmits an acoustic signal to a distant receiver via a string of drillpipes connected by tool joints. The digital signal processor drives the acoustic transducer with an electrical signal that represents modulated digital data convolved with a time-reversed channel response. Due to the use of time-reversal pre-equalization, the received signal exhibits substantially reduced intersymbol interference.