Patent ID: 9732571
Date: 2017-08-15
CPC Classifications: E21B

Claim:
1. An injector head comprising: a pair of oppositely located, cooperatively movable, segmented continuous belt drive chains, each belt drive chain of the pair of belt drive chains running over a respective pair of drive sprockets and tension sprockets; wherein a tubing receiving section is defined between the pair of belt drive chains, said tubing receiving section having a tubing section centerline extending through a center of the tubing receiving section, said injector head having an injector centerline extending through a centerline of the injector head, said injector centerline and said tubing section centerline being substantially aligned in a longitudinal direction in an initial position; a pair of elongate counter-force members positioned on opposite sides of the tubing receiving section; wherein said injector head comprises a first actuator adapted to move a first elongate counter-force member of the pair of elongate counter-force members in order to bring the tubing section centerline out of alignment with said injector centerline, said first actuator being connected to the first elongate counter-force member in order to actively move the first elongate counter-force member a distance away from said injector centerline; and wherein a second elongate counter-force member of the pair of elongate counter-force members is moved an equal distance away from said injector centerline in order to compensate for any unsynchronized movement of the pair of belt drive chains.