Patent ID: 8720540
Filing Date: 2014-05-13
Classification: E21B

Abstract:
1. A downhole tool for use in a wellbore tubular string, comprising: a housing having a bore therethrough forming part of a fluid flowpath through the wellbore tubular string; a sliding member operable to slide with respect to the housing; a magnetic reader operable to detect magnetic patterns in the bore of the downhole tool; and an actuator, wherein the sliding member comprises a locked position and an unlocked position, wherein the actuator is operable to move the sliding member from the locked position to the unlocked position, wherein a sliding line is formed by interfacing surfaces of the sliding member and the housing, and wherein the actuator is configured to move the sliding member from the locked position to the unlocked position by moving one or more radial pins so that none of the one or more pins span the sliding line.