Method for Determining Drilling Fluid Induced Fractures

摘要

A tool is for use in a borehole during drilling with a drilling fluid circulating in the borehole. The tool may include a housing, a plurality of spaced apart radio frequency (RF) transmitters carried by the housing, spaced apart RF receivers carried by the housing, and a controller to communicate with the plurality of transmitters and the receivers. The controller may, at a given depth within the borehole, determine attenuation resistivity measurements and phase-shift resistivity measurements both corresponding to different radial distances from the borehole. The controller may also determine when a fracture has occurred in the geological formation at the given depth allowing the drilling fluid to intrude into the geological formation based upon the attenuation resistivity measurements and the phase-shift resistivity measurements.

主权项

1. A tool for use in a borehole during drilling with a drilling fluid circulating in the borehole, the tool comprising:
a housing; a plurality of spaced apart radio frequency (RF) transmitters carried by said housing; a plurality of spaced apart RF receivers carried by said housing; and a controller to communicate with said plurality of transmitters and said plurality of receivers to
at a given depth within the borehole, determine a plurality of attenuation resistivity measurements and phase-shift resistivity measurements both corresponding to different radial distances from the borehole, anddetermine when a fracture has occurred in the geological formation at the given depth allowing the drilling fluid to intrude into the geological formation based upon the plurality of attenuation resistivity measurements and the plurality of phase-shift resistivity measurements.