Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1982-05-20
1984-10-30
Howell, Janice A.
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
166113, G01V 512, E21B 2300
Patent
active
044801866
ABSTRACT:
Disclosed is an improved compensated density well logging apparatus which provides a mechanical linkage driven by an electric gear motor for extension of a thin cylindrical pad containing radioactive source and detection equipment exteriorly of the tool housing so as to penetrate the filter cake and eliminate or reduce the distorting effect of the filter cake and well bore fluid. A spring biased caliper arm is used to justify the tool and extended pad against the side of a well bore during measurement. The linkage supporting and positioning the caliper arm includes a pivot pin which extends exteriorly of the tool housing to engage two parallel aligned guide wheels riding in grooves formed exteriorly in the tool housing so as to reduce friction and prevent lateral movement of the linkage. This provides for a more accurate reading of the variable thickness of the filter cake and well bore diameter at varying depths within the well bore.
A linear motion transducer including a Titanium shell is used to translate the instantaneous position of the caliper arm with respect to the tool housing into a measurement of the well bore diameter and filter cake thickness. The linear motion transducer is encapsulated in a resilient bellows filled with a low viscosity fluid which is pressure equalized with the drilling fluid so as to facilitate the rapid movements of the caliper arm and linkage. A slot engaging a pin within the caliper arm linkage allows the complete retraction of the caliper arm without affecting the fully extended position of the radioactive pad. Two linearly aligned springs of different spring load constants are utilized to maintain a constant and linearized force urging the caliper arm outward with respect to the tool housing.
REFERENCES:
patent: 3187824 (1965-06-01), Gauban
patent: 3254221 (1966-05-01), Saurenman
patent: 3321625 (1967-05-01), Wahl
patent: 4120353 (1978-10-01), Roesner
Hannaher Constantine
Howell Janice A.
Matthews Guy E.
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