Abstract: A method and apparatus for acquiring a plurality of sidewall cores from an earth formation intersected by a wellbore while a coring tool is located downhole. A sidewall coring tool is provided having an internal core receptacle for receiving and storing sidewall cores in serial orientation. The coring tool incorporates a movable bit box providing rotary support and linear coring and retracting movement of a rotary coring bit. A bit box tilting and rotation actuator is incorporated within the coring tool for achieving breaking at the core sample from the formation and for selectively positioning of the bit box and rotary coring bit at a coring position where the bit is oriented in normal relation with the axis of the wellbore and a core ejecting position where the rotary coring bit is positioned in registry with the internal core receptacle for deposit of cores in serially oriented relation therein.

Abstract: A carrier apparatus for a radioactive well logging instrument is disclosed that includes an elongated generally cylindrical tool body adapted for wireline suspension within a well borehole and mounting an elongated sensor pad assembly carrying a radioactive source and at least one detector and adapted for a nesting fit with the tool body. Knuckle joint links mounted on the tool body engage opposite ends of the sensor pad for laterally extending the pad assembly from the tool body into contact with the borehole wall. The knuckle joint links provide independent preselected force loading to each end of the pad assembly and permit articulation of the pad assembly with respect to the tool body axis for maintaining the sensor pad assembly in contact with the borehole wall under rugose conditions.