Measuring and testing – Borehole or drilling – Downhole test
Patent
1995-02-10
1996-04-23
Brock, Michael J.
Measuring and testing
Borehole or drilling
Downhole test
73438, G01N 926, E21B 4700
Patent
active
055093035
ABSTRACT:
The present invention is a differential pressure fluid density instrument comprising a housing having a plurality of ports positioned at spaced-apart locations along the housing, a differential pressure transducer, and a valve adapted to selectively connect the transducer across two predetermined one of the plurality of ports. The valve may comprise a three-way solenoid actuated valve. Fluid expansion wells are each connected at one end to a port and prevent wellbore fluids from reaching the differential pressure transducer. The housing includes an inner chamber filled with liquid which may be silicon oil. The chamber includes a standpipe which extends from near the bottom of the chamber, where it is in communication with a lower port, to the top of the chamber. Communication between the chamber and wellbore through the standpipe enables the housing and components disposed within the chamber to be constructed without the need to withstand high differential pressures.
REFERENCES:
patent: 2747401 (1956-05-01), Doll
patent: 3184965 (1965-05-01), Noik
patent: 3455157 (1969-07-01), Lahaye et al.
patent: 3616688 (1971-11-01), Roussin et al.
Brock Michael J.
Fagin Richard A.
Western Atlas International Inc.
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