Abstract: A modular control system includes a control module removably attachable to an exterior of a downhole tool. A controlled device, the controlled device providing a function for the downhole tool. The controlled device controlled by the control module.

Abstract: A modular control system includes a control module removably attachable to an exterior of a downhole tool. A controlled device, the controlled device providing a function for the downhole tool. The controlled device controlled by the control module.

Abstract: A downhole actuator includes, a sleeve, a mandrel, and at least one of the sleeve and the mandrel is in operable communication with a downhole tool to be actuated. The actuator further includes, a follower disposed at one of the sleeve and the mandrel, a pathway disposed at the other of the sleeve and the mandrel, the pathway being receptive to the follower and configured to cause rotational motion and limit a stroke length between the sleeve and the mandrel in response to longitudinal motion between the follower and the pathway. The actuator also has a shape memory alloy in operable communication with the sleeve and the mandrel configured to longitudinally move the sleeve in relation to the mandrel in response to temperature changes thereof.