Electrical resistance tomography from measurements inside a steel cased borehole

Patent · Fri Dec 31 23:00:00 EST 1999

OSTI ID:873092

Daily, William D ^[1]; Schenkel, Clifford ^[2]; Ramirez, Abelardo L ^[3]

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1. Livermore, CA
2. Walnut Creek, CA
3. Pleasanton, CA

Electrical resistance tomography (ERT) produced from measurements taken inside a steel cased borehole. A tomographic inversion of electrical resistance measurements made within a steel casing was then made for the purpose of imaging the electrical resistivity distribution in the formation remotely from the borehole. The ERT method involves combining electrical resistance measurements made inside a steel casing of a borehole to determine the electrical resistivity in the formation adjacent to the borehole; and the inversion of electrical resistance measurements made from a borehole not cased with an electrically conducting casing to determine the electrical resistivity distribution remotely from a borehole. It has been demonstrated that by using these combined techniques, highly accurate current injection and voltage measurements, made at appropriate points within the casing, can be tomographically inverted to yield useful information outside the borehole casing.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA
• DOE Contract Number: W-7405-ENG-48
• Assignee: Regents of University of California (Oakland, CA)
• Patent Number(s): US 6088655
• OSTI ID: 873092
• Country of Publication: United States
• Language: English

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