System, apparatus, and method of conducting measurements of a borehole

摘要

A bias unit having a support body in use to be integrated with a drilling assembly and rotatable therewith for drilling a borehole penetrating a geological formation. A pad is pivotally connected to the support body proximate to the leading edge of the pad. A spring-driven push rod is positioned and preloaded to engage the pad, proximate to the trailing edge of the pad, and to urge the pad outward from the support body to contact the borehole wall during drilling.

主权项

1. A rotary drilling assembly for drilling a borehole penetrating a geological formation, the drilling assembly comprising:
a drill bit positioned on a forward end of the drilling assembly to rotatably engage the formation; a bias unit coupled to the drill bit and configured to control a direction of drilling by the drill bit, wherein the bias unit comprises a tool body; a pad having a leading edge and a trailing edge, the pad being pivotally affixed to the tool body at the leading edge; and a linear actuator formed in the tool body and comprising a linear spring and a push rod, wherein the linear spring and the push rod are configured to engage and apply a linear force to the trailing edge of the pad that urges the pad radially outward from the tool body to contact a wall of the borehole during rotation of the drilling assembly, wherein the linear force applied to the trailing edge of the pad is substantially parallel to a longitudinal axis of the linear spring.