Through casing resistivity measurement in permanently installed downhole production environment
First Claim
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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.
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Abstract
A method and apparatus for measuring changes in the media within a geologic formation by transmitting magnetic flux through a section of ferromagnetic well casing and measuring the change in flux received back through the casing. The flux transmitter and receiving components may be permanently installed in a hydrocarbon production well.
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Citations
41 Claims
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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:
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(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 Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. An apparatus for measuring resistivity of media in geologic formations from at least one fixed location through 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:
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(a) means for creating at least one magnetic flux proximate to but electrically isolated from a first inner side of a material and engaging at least a portion of the material with magnetic flux such that a saturated area extends through a thickness of the material to a second side;
(b) means for creating and transmitting at least one second separate magnetic flux proximate to but electrically isolated from the first inner side of the material through the saturated area of the material; and
(c) means paced proximate to the first side for detecting magnetic flux passing through a saturate area of material from the second side to the first side. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. An apparatus for measuring the resistivity of media in a geologic formation surrounding a hydrocarbon production well casing comprising an electrical power supply, at least one magnetic flux saturation means electrically connected to the power supply and electrically isolated from the casing, at least one magnetic flux transmitter means electrically connected to the power supply and electrically isolated from the casing, at least on capacitor, diode, switch amplifier, nulling device, pulser, at least one magnetic flux receiver means electrically isolated from the casing, communication means, and an out put display.
Specification