Abstract: A coring tool includes an electronics section that includes a material that is buoyant in a wellbore fluid, a coring section coupled to the electronics section and including a sidewall coring unit operable to penetrate an inner wall of a wellbore and thereby obtain a core sample, and a stabilizer arm assembly operable to laterally extend a stabilizer arm into engagement with the inner wall of the wellbore. A weight section is operatively coupled to the electronics and coring sections and exhibits a weight that overcomes buoyancy forces generated by the buoyant material in the wellbore fluid, and a release mechanism releasably attaches the weight section to the electronics and coring sections. Activating the release mechanism detaches the weight section, and thereby allows the electronics and coring sections to float in the wellbore fluid and ascend the wellbore.

Abstract: A coring tool includes an electronics section that includes a material that is buoyant in a wellbore fluid, a coring section coupled to the electronics section and including a sidewall coring unit operable to penetrate an inner wall of a wellbore and thereby obtain a core sample, and a stabilizer arm assembly operable to laterally extend a stabilizer arm into engagement with the inner wall of the wellbore. A weight section is operatively coupled to the electronics and coring sections and exhibits a weight that overcomes buoyancy forces generated by the buoyant material in the wellbore fluid, and a release mechanism releasably attaches the weight section to the electronics and coring sections. Activating the release mechanism detaches the weight section, and thereby allows the electronics and coring sections to float in the wellbore fluid and ascend the wellbore.

Abstract: A body defines a feedthrough passage. Bow springs surround and connect to an outer periphery of the body. The bow springs extend radially outward from the body. An internal coil spring is arranged to actuate axially within the body. A mandrel abuts an end of the coiled spring. The mandrel is arranged to move within the body, the mandrel having sufficient inertia to dampen vibrations.