Radial sounding electrical well logging instrument

G - Physics – 01 – V

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

G01V 3/20 (2006.01) E21B 49/00 (2006.01) G01V 3/24 (2006.01)

Patent

CA 2258410

An apparatus for determining radial distribution of resistivity of earth formations surrounding a wellbore. The apparatus includes a sonde mandrel having an insulating exterior surface and electrodes disposed on the insulating surface at spaced apart locations. The electrodes are connected to circuits for measuring a focused current resistivity within a predetermined longitudinal span. The electrodes are also connected to circuits for measuring electrical impedance between pairs of electrodes spaced apart at a plurality of different longitudinal spacings. The preferred embodiment includes a voltage measuring circuit interconnected between a pair of electrodes which is positioned between a closest spaced pair of electrodes connected to the impedance measuring circuits, so that a vertical resolution of the impedance measurements can be limited to approximately the axial spacing of the pair of electrodes connected to the voltage measuring circuit. A method according to the invention for determining the distribution of resistivity of earth formations surrounding a wellbore includes the steps of measuring a focused current resistivity of the earth formations to determine a composite resistivity of an uninvaded zone, an invaded zone and a flushed zone. Impedance is measured between pairs of electrodes, each pair having a different longitudinal spacing, and resistivity of the flushed zone and the invaded zone are determined from the measurements of impedance. The resistivity of the uninvaded zone can then be determined from the measurement of focused current resistivity.

LandOfFree

Say what you really think

Search LandOfFree.com for Canadian inventors and patents. Rate them and share your experience with other people.

Rating

Radial sounding electrical well logging instrument does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Radial sounding electrical well logging instrument, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radial sounding electrical well logging instrument will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-1532084

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.