Methods and apparatus for optically measuring fluid compressibility downhole
    8.
    发明授权
    Methods and apparatus for optically measuring fluid compressibility downhole 有权
    光学测量井下流体压缩性的方法和装置

    公开(公告)号:US06474152B1

    公开(公告)日:2002-11-05

    申请号:US09704630

    申请日:2000-11-02

    IPC分类号: E21B4700

    摘要: The compressibility of a formation hydrocarbon sample is determined downhole by using a borehole tool to obtain the sample downhole, and, at two different pressures, subjecting the sample to near infrared illumination and conducting spectral absorption measurement of peaks at and/or around about 6,000 cm−1 and/or at and/or about 5,800 cm−1 (the absorption peaks of methane and crude oil respectively). The compressibility of the sample is determined from the change in the peak areas, the change in pressure, and the measured peak area itself. According to a preferred embodiment of the invention, the pressure is changed at least 2000 pounds per square inch (psi), and preferably 4000 or more psi between measurements.

    摘要翻译: 通过使用钻孔工具在井下获得地层烃样品的压缩性,在井下获得样品,并且在两个不同的压力下,对样品进行近红外照明并进行和/或约约6000cm处的峰的光谱吸收测量 -1和/或在和/或约5,800cm -1(分别为甲烷和原油的吸收峰)。 样品的压缩性由峰面积的变化,压力的变化和测量的峰面积本身确定。 根据本发明的优选实施例,在测量之间,压力改变为至少2000磅/平方英寸(psi),并且优选地改变为4000或更大的psi。