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US 8,925,213 B2Granted
Wellbore caliper with maximum diameter seeking feature
AssigneeSchlumberger Technology Corporation
InventorAlan J. Sallwasser
Life of this patent
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Abstract
A wellbore caliper includes an actuator housing pivotally connected at one end to a well logging instrument housing and an actuator disposed in the housing and operable to extend and retract laterally extensible measuring arms.
Claims19
A wellbore caliper, comprising:
- an actuator housing pivotally connected at one end to a well logging instrument housing;
- an actuator disposed in the housing and operable to extend and retract laterally extensible measuring arms;
- and
- an adjustable spring cooperatively engaged with the pivotal connection such that the actuator housing is substantially neutrally buoyant in the wellbore.
1 more element
A method for well logging, comprising:
- moving a well logging tool along an interior of a wellbore drilled through formations, the well logging tool comprising a caliper, the caliper comprising an actuator housing pivotally connected at one end to a well logging instrument housing, an actuator disposed in the housing and operable to extend and retract laterally extensible measuring arms;
- and
- measuring an internal dimension of the wellbore by determining a lateral extension of the measuring arms;
- and
- an adjustable spring cooperatively engaged with the pivotal connection such that the actuator housing is substantially neutrally buoyant in the wellbore.
2 more elements
Dependencies are inferred from the claim text.