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    Determining dew precipitation and onset pressure in oilfield retrograde condensate
    4.
    发明授权
    Determining dew precipitation and onset pressure in oilfield retrograde condensate 有权
    确定油田逆行冷凝水中的露水沉淀和起始压力

    公开(公告)号：US07002142B2

    公开(公告)日：2006-02-21

    申请号：US10309850

    申请日：2002-12-03

    申请人： Oliver C. Mullins ,  Go Fujisawa ,  Chengli Dong ,  Andrew Kurkjian ,  John Nighswander ,  Toru Terabayashi ,  Satoko Yoshida ,  Hideki Kinjo ,  Henning Groenzin

    发明人： Oliver C. Mullins ,  Go Fujisawa ,  Chengli Dong ,  Andrew Kurkjian ,  John Nighswander ,  Toru Terabayashi ,  Satoko Yoshida ,  Hideki Kinjo ,  Henning Groenzin

    IPC分类号： G01V8/00

    CPC分类号： E21B49/084 ,  E21B47/1015 ,  E21B49/005 ,  E21B49/10 ,  G01N21/64 ,  G01N33/241 ,  G01N33/2823

    摘要： A method and apparatus detects dew precipitation and determines dew precipitation onset pressure in a sample of formation fluid located downhole in an oilfield reservoir. In a preferred embodiment, the method includes (a) isolating a sample of formation fluid downhole; (b) illuminating the sample downhole with fluorescence excitation light; (c) measuring at least one characteristic of fluorescence short from the sample; (d) reducing pressure on the sample; (e) repeating steps (b) to (d); (f) detecting dew precipitation when a change is detected in a parameter that is a function of the at least one characteristic of fluorescence emission; and (g) setting dew precipitation onset pressure equal to pressure on the sample when the change in the parameter is detected. The parameter preferably is a function of fluorescence intensity and fluorescence red shift, and the change is an increase in fluorescence intensity and detection of fluorescence red shift. Also, the function includes a ratio of a measured intensity at a first wavelength to a reference intensity, and the reference intensity is a function of a measured intensity at a second wavelength.

    摘要翻译： 方法和装置检测露点沉淀，并确定位于油田储层中井下的地层流体样品中的露水沉淀开始压力。 在一个优选实施例中，该方法包括（a）在井下分离地层流体样品; （b）用荧光激发光照射井下样品; （c）从所述样品测量至少一种荧光短的特征; （d）降低样品压力; （e）重复步骤（b）至（d）; （f）当在作为荧光发射的至少一个特征的函数的参数中检测到变化时，检测露水沉淀; 和（g）当检测到参数变化时，将露珠沉淀开始压力设定为等于样品上的压力。 该参数优选是荧光强度和荧光红移的函数，并且荧光强度的变化和荧光红移的检测变化。 此外，该功能包括第一波长处的测量强度与参考强度的比率，并且参考强度是第二波长处的测量强度的函数。

    Methods and apparatus of downhole fluid analysis
    5.
    发明授权
    Methods and apparatus of downhole fluid analysis 有权
    井下液分析方法与装置

    公开(公告)号：US07461547B2

    公开(公告)日：2008-12-09

    申请号：US11203932

    申请日：2005-08-15

    申请人： Toru Terabayashi ,  Akihito Chikenji ,  Tsutomu Yamate ,  Oliver C. Mullins ,  Andrew L. Kurkjian ,  Hani Elshahawi

    发明人： Toru Terabayashi ,  Akihito Chikenji ,  Tsutomu Yamate ,  Oliver C. Mullins ,  Andrew L. Kurkjian ,  Hani Elshahawi

    IPC分类号： E21B47/08

    CPC分类号： G01N9/36 ,  E21B49/10 ,  G01N2011/006

    摘要： Methods and apparatus for downhole analysis of formation fluids by isolating the fluids from the formation and/or borehole in a pressure and volume control unit that is integrated with a flowline of a fluid analysis module and determining fluid characteristics of the isolated fluids. Parameters of interest may be derived for formation fluids in a static state and undesirable formation fluids may be drained and replaced with formation fluids that are suitable for downhole characterization or surface sample extraction. Isolated formation fluids may be circulated in a loop of the flowline for phase behavior characterization. Real-time analysis of the fluids may be performed at or near downhole conditions.

    摘要翻译： 通过将压力和体积控制单元中的流体从地层和/或钻孔中分离出来并与流体分析模块的流线集成并确定分离流体的流体特性，来对地层流体进行井下分析的方法和装置。 可以为处于静态的地层流体导出感兴趣的参数，并且可以排出不希望的地层流体并用适于井下表征或表面样品提取的地层流体替代。 隔离的地层流体可以在流动管线的环路中循环以进行相位行为表征。 流体的实时分析可以在井下或近井条件下进行。