China Petroleum & Chemical Corporation
Autonomous through-tubular downhole shuttle

Abstract:

An apparatus for traveling between an earth surface and a wellbore in an earth formation contains an instrument sub, a thruster for generating a motive force, and a power source that provides power to the instrument sub and the thruster. The instrument sub contains well logging instruments. The instrument sub, the thruster, and the power source are connected to form or are disposed in a substantially tubular body. The apparatus further contains a buoyance-generating device.