×

Through casing resistivity measurement in permanently installed downhole production environment

  • US 6,597,177 B1
  • Filed: 11/20/2000
  • Issued: 07/22/2003
  • Est. Priority Date: 11/20/2000
  • Status: Expired due to Fees
First Claim
Patent Images

1. The method for measuring resistivity of media in geologic formations from at least one fixed location through the well casing or tubing material having a first inner side and a second outer side and manufactured from a group containing at least ferromagnetic or paramagnetic materials comprising:

  • (a) generating a magnetic flux proximate to but electrically isolated from a first inner side of the material into engage and saturate a portion of the material through the thickness to the second outer side;

    (b) generating a second magnetic flux proximate to but electrically isolated from the saturated first inner side and transmitting the second flux through the second outer side. (c) Using means near but electrically isolated from the first inner side to detect magnetic flux passing through a saturated area from the second side to the first side.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×