| 摘要 |
In one embodiment, a ball release system for use in a wellbore includes a tubular housing 75b, a seat 90 disposed in the housing and comprising arcuate segments 90s arranged to form a ring, each segment 90s radially movable between a catch position for receiving a ball and a release position, a cam 88 disposed in the housing 75b , longitudinally movable relative thereto, and operable to move the seat segments 90s between the positions, an actuator 80 operable to move the cam 88, and an electronics package 81 disposed in the housing and in communication with the actuator 80 for operating the actuator in response to receiving a command signal. |
