AN ANTI-LOCKING DEVICE FOR USE WITH AN ARM SYSTEM FOR LOGGING A WELLBORE AND METHOD FOR USING SAME

摘要

An anti-lock system, device and method for logging a wellbore (106) are presented. The anti-lock system of a downhole tool (104) preferably includes a first arm (200), a second arm (202), a pad (108), a swivel bearing between the first arm and the pad, and an anti-locking device. The first arm has an arm first end connected to the tool body (220) of the downhole tool and an arm second end connected to a first end of the pad. The second arm has an arm first end connected to the tool body of the downhole tool and an arm second end connected to a second end of the pad. The swivel bearing between the first arm and the pad pivotally connects the first arm to the pad. The anti-locking device is coupled to the swivel bearing, and preferably includes an anti-lock biasing (118) member for maintaining a connection between the first arm and the pad at the swivel bearing in an engaged position during normal logging and for allowing the connection to rotate toward a biased position when a binding force is encountered in the arm system.