Methods and devices for extra-deep azimuthal resistivity measurements

摘要

An apparatus for estimating at least one parameter of interest of an earth formation includes a first sub and a second sub positioned along the conveyance device. The first sub and the second sub cooperate to generate at least one main component measurement and only the second sub is configured to generate at least one cross-component measurement. A method includes conveying a first sub and a second sub along a wellbore formed in the earth formation using a conveyance device, using the first sub and the second sub to generate at least one main component measurement, and using only the second sub to generate at least one cross-component measurement.

主权项

1. An apparatus for estimating at least one property of an earth formation, comprising:
a conveyance device configured to traverse a wellbore formed in the earth formation; a first sub positioned along the conveyance device; and a second sub positioned along the conveyance device, wherein the first sub comprises a first enclosure, and the second sub comprises a second enclosure different from the first enclosure, wherein the first sub and the second sub cooperate to generate at least one differential main component measurement, wherein only the second sub is configured to generate at least one cross-component measurement, and wherein the main component measurement is one of: (i) a co-axial component, and (ii) a co-planar component;
a clock associated with the second sub, the clock being used to synchronize only the at least one cross-component measurement, the clock not being in signal communication with the first sub; and unrelated equipment separating the first sub and the second sub.