Method and apparatus for demagnetizing a borehole

Details Method and apparatus for demagnetizing a borehole Method and apparatus for demagnetizing a borehole

2011-03-29

2011-03-29

Neuder, William P (Department: 3676)

Wells

Processes

Electric current or electrical wave energy through earth for...

C166S066500, C367S025000

Reexamination Certificate

active

07913756

ABSTRACT:
A demagnetizing sub having an electromagnet or a rotating magnet is used for demagnetizing magnetized material in a wellbore. By gradually reducing the magnetic field, the magnetized material within the wellbore is demagnetized.

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Wilson et al., Wellbore Position Errors Caused by Drilling Fluid Contamination, SPE 71400, 2001 SPE Annual Technical Conference and Exhibition, Sep. 30-Oct. 3, 2001, pp. 1-8.
Torkildsen et al., Drilling Fluid Affects MWD Magnetic Azimuth and Wellbore Position, IADC/SPE 87169, IADC/SPE Drilling Conference, Mar. 2004, pp. 1-8.
Harry Wilson et al.; Wellbore Position Errors Caused by Drilling-Fluid Contamination, SPE 75329, SPE Drilling & Completion, Dec. 2001, pp. 208-213.

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