Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Including borehole fluid investigation
Patent
1989-11-21
1990-12-04
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
Including borehole fluid investigation
73 611R, 7386104, 324355, 324663, 324686, G01V 318, G01R 2726, G01F 164, G01F 174
Patent
active
049756451
ABSTRACT:
The logging tool comprises a gas void fraction measurement section (37) consisting of a first set (37) of eight longitudinal electrodes (38) extending parallel to the longitudinal axis of the tool and positioned and regularly spaced around said longitudinal axis, a sleeve (40) made of dielectric material and located in contact and around the electrodes for obtaining an electric field pattern distributed essentially radially between the electrodes and the wall (12) of the borehole facing the electrodes (38), a centralizer (32) for substantially centralizing the tool in the borehole, and a circuit means (69-115) for measuring sequentially the capacitance between two adjacent electrodes for each pair of electrodes, said capacitance being characteristic of the gas void fraction of the fluid flowing in the wellbore. The logging tool comprises in addition a cross correlation gas velocity measurement section (28) which includes a second (48) and a third (50) set of electrodes.
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"Capacitance Transducers for Concentration Measurement in Multi-Component Flow Processes", 3rd International Conference on Multi-Phase Flow, The Hague, Netherlands, 18-20 May, 1987, by S. M. Huang et al.
DuPont Henri
Ryberg John J.
Schlumberger Technology Corporation
Strecker Gerard R.
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