Basalt fiber composite for antenna in well-logging

摘要

A well-logging tool for a geological formation includes a housing to be positioned in a borehole and an antenna assembly carried by the housing. The antenna assembly includes an antenna housing having a recess therein. A dielectric material layer comprises a basalt fiber composite and is within the recess. At least one antenna coil is supported by the dielectric material layer. An electrical connector is coupled to the at least one antenna coil. Resistivity processing circuitry is coupled to the electrical connector to determine an electrical resistivity of the geological formation based on the at least one antenna coil.

主权项

1. A well-logging tool for a geological formation having a borehole therein, comprising:
a housing to be positioned within the borehole; an antenna assembly carried by the housing and comprising
an antenna housing having a recess therein,a dielectric material layer comprising a basalt fiber composite within the recess;at least one antenna coil supported by the dielectric material layer,an electrical connector coupled to the at least one antenna coil,wherein said dielectric material layer is configured to prevent fluid leakage to the antenna coil and/or electrical connector when the well-logging tool is operated at a downhole temperature higher than 175° C.; and resistivity processing circuitry coupled to the electrical connector to determine an electrical resistivity of the geological formation based upon the at least one antenna coil.