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    • 5. 发明授权
    • Method for borehole measurement of formation properties
    • 钻孔测量方法
    • US07310580B2
    • 2007-12-18
    • US10318786
    • 2002-12-13
    • Minyao ZhouHans ThomannStuart Ronald Keller
    • Minyao ZhouHans ThomannStuart Ronald Keller
    • G01V1/40G06G7/48
    • G01V1/50
    • The present invention is a method of estimating formation properties by analyzing acoustic waves that are emitted from and received by a bottom hole assembly. A bottom hole assembly may be deployed in a borehole to estimate formation properties. From the bottom hole assembly, a source signal may be emitted and at least one signal may be received by one or more receivers in the bottom hole assembly. Analysis of the frequency dependent characteristics of the received signal allows the estimation of the formation properties of interest, including pore pressure. The formation properties of interest may be used to monitor a wellbore pressure safety margin and to optimize drilling and weight.
    • 本发明是通过分析从底孔组件发出并接收的声波来估计地层特性的方法。 井底组件可以部署在钻孔中以估计地层特性。 从井底组件可以发射源信号,并且至少一个信号可以由底孔组件中的一个或多个接收器接收。 对接收信号的频率依赖特性的分析允许估计感兴趣的形成特性,包括孔隙压力。 感兴趣的形成特性可用于监测井筒压力安全裕度,并优化钻井和重量。
    • 9. 发明授权
    • Method and apparatus for detection of a liquid under a surface
    • 用于检测表面下的液体的方法和装置
    • US08436609B2
    • 2013-05-07
    • US12672969
    • 2008-08-29
    • Leonard J. SrnkaTimothy J. NedwedHans ThomannRobert E. Sandstrom
    • Leonard J. SrnkaTimothy J. NedwedHans ThomannRobert E. Sandstrom
    • G01V3/00
    • G01V3/175G01N24/08G01N24/081G01R33/50Y02A90/344
    • Methods for detecting a liquid under a surface and characterizing Ice are provided The liquid may be a liquid hydrocarbon such as crude oil or fuel oil or mineral oil The surface may be ice, snow, or water, and the method may be practiced in an arctic region to detect oil spills, leaks, or seepages The methods may be used with a range finder to characterize marine ice The methods may include a nuclear magnetic resonance (NMR) tool with antenna to send a radio-frequency (RF) excitation pulse or signal into volume of substances being detected, detect an NMR response signal to determine the presence of the liquid of interest The NMR response may include a relaxation time element and an intensity level and may include a free induction signal (T2*), a spin echo signal (T2), a train of spin echo signals (T2), or a thermal equilibrium signal (T 1).
    • 提供用于检测表面下的液体并表征冰的方法液体可以是诸如原油或燃料油或矿物油的液体烃。表面可以是冰,雪或水,并且该方法可以在北极 检测漏油,泄漏或泄漏的方法可以与测距仪一起使用以表征海洋冰。该方法可以包括具有天线的核磁共振(NMR)工具以发送射频(RF)激发脉冲或信号 检测到的物质的体积,检测NMR响应信号以确定感兴趣的液体的存在。NMR响应可以包括弛豫时间元素和强度水平,并且可以包括自由感应信号(T2 *),自旋回波信号 (T2),一系列自旋回波信号(T2)或热平衡信号(T 1)。
    • 10. 发明授权
    • Non-destructive determination of the pore size distribution and the distribution of fluid flow velocities
    • 非破坏性测定孔径分布和流体流速分布
    • US08384379B2
    • 2013-02-26
    • US12675087
    • 2008-10-01
    • Robert D. NielsenHans Thomann
    • Robert D. NielsenHans Thomann
    • G01V3/00G01V33/20
    • G01V3/32G01N24/081G01R33/5617G01R33/56308G01R33/56358
    • A method is disclosed for the non-destructive determination of the pore size distribution and the distribution of fluid flow velocities using NMR spin echo signal measurements. In one embodiment, the invention involves simultaneously injecting acoustic energy (208), generating a magnetic field having a gradient, and injecting radio-frequency electromagnetic energy (206) into a subsurface region, using for example an NMR tool and a well logging tool having an acoustic transmitter placed in a wellbore (202). The spin echo signal generated in the subsurface region is measured (210) by the NMR tool for at least two values (212) of the magnetic field gradient. A relationship is provided by which the pore fluid velocity distribution may be calculated (214) from the inverse Fourier transform of the spin echo data. The pore size distribution may then be calculated from the pore fluid velocity distribution.
    • 公开了一种使用NMR自旋回波信号测量法非破坏性地确定孔径分布和流体流速分布的方法。 在一个实施例中,本发明涉及同时注入声能(208),产生具有梯度的磁场,并且使用例如NMR工具和测井工具将射频电磁能(206)注入到地下区域 放置在井筒(202)中的声发射器。 通过NMR工具对磁场梯度的至少两个值(212)测量(210)在地下区域中产生的自旋回波信号。 提供了一种关系,通过该关系可以从自旋回波数据的逆傅里叶变换计算孔隙流体速度分布(214)。 然后可以从孔隙流体速度分布计算孔径分布。