发明名称 |
Determining dew precipitation and onset pressure in oilfield retrograde condensate |
摘要 |
<p>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.</p> |
申请公布号 |
GB2391620(B) |
申请公布日期 |
2004.08.04 |
申请号 |
GB20030014383 |
申请日期 |
2003.06.20 |
申请人 |
* SCHLUMBERGER HOLDINGS LIMITED |
发明人 |
OLIVER C * MULLINS;GO * FUJISAWA;CHENGLI * DONG;ANDREW L * KURKJIAN;JOHN ALLAN * NIGHSWANDER;TORU * TERABAYASHI;SATOKO * YOSHIDA;HIDEKI * KINJO;HENNING * GROENZIN |
分类号 |
E21B47/10;E21B49/00;E21B49/08;E21B49/10;G01N21/64;G01N33/24;G01N33/28;(IPC1-7):E21B49/08 |
主分类号 |
E21B47/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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