Demagnetizer to Eliminate Residual Magnetization Produced by Nuclear Magnetic Resonance Logs
AssigneeBaker Hughes Incorporated
InventorsHomero C. Castillo, Thomas Kruspe
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Abstract
An apparatus and method is disclosed for measuring a parameter of an earth formation surrounding a wellbore. A Nuclear Magnetic Resonance (NMR) tool and at least one second tool are conveyed in the wellbore on a wireline, the NMR tool having a magnetic influence on a region of the wellbore. The magnetic influence of the NMR tool is removed from the region of the wellbore using a demagnetizing device. The parameter of the earth formation is measured using the at least one second tool. A second demagnetizing device may be used to remove the magnetic influence of the at least one second tool from the region of the wellbore.
Claims22
An apparatus conveyed on a wireline for measuring a parameter of an earth formation surrounding a wellbore, comprising:
- a Nuclear Magnetic Resonance (NMR) tool that magnetically influences a region of the wellbore;
- a demagnetizing device configured to remove the magnetic influence of the NMR tool from the region of the wellbore;
- and
- at least one second tool spaced apart from the NMR tool and configured to measure the parameter of the earth formation.
A method of measuring a parameter of an earth formation surrounding a wellbore, comprising:
- conveying a Nuclear Magnetic Resonance (NMR) tool and at least one second tool in the wellbore on a wireline, the NMR tool having a magnetic influence on a region of the wellbore;
- removing the magnetic influence of the NMR tool from the region of the wellbore using a demagnetizing device;
- and
- measuring the parameter of the earth formation using the at least one second tool.
Dependencies are inferred from the claim text.