Wells – Valves – closures or changeable restrictors
Patent
1980-06-16
1981-09-01
Novosad, Stephen J.
Wells
Valves, closures or changeable restrictors
166334, E21B 2300, E21B 4706
Patent
active
042866618
ABSTRACT:
A well testing tool system for isolating vertically spaced portions of a well bore and measuring well conditions such as pressure, and temperature. The system includes a wireline supported tool train and a locking sub connectible on a removable lock mandrel for releasably locking the tool train in a well bore. The tool train has a locking probe releasably connectible in the locking sub, a probe mandrel connected with the probe, an equalizing valve and shock absorber, and a gauge for measuring an operating condition in the well. The locking sub permits insertion of the probe at a low force and requires a larger force for withdrawal. The locking sub grips the probe with a force directly proportional to the pressure differential across the locking sub. The equalizing valve and shock absorber provides for pressure equalization across the tool train during handling and absorbs shock to protect the measuring device. Two forms of the valve and shock absorber are spring biased open. Another form is spring biased closed. Each form of the valve and shock absorber is a telescoping assembly having a longitudinally movable spring biased valve member in a housing and a shock absorber spring between the valve member and housing.
REFERENCES:
patent: 3051243 (1962-08-01), Grimmer et al.
patent: 3051245 (1962-08-01), Andrew et al.
patent: 3141506 (1964-07-01), Thomas
patent: 3273649 (1966-09-01), Tamplen
patent: 3581819 (1971-06-01), Tamplen
patent: 3960366 (1976-06-01), Abney et al.
Garland H. Mathews
Novosad Stephen J.
Otis Engineering Corporation
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