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US 11,693,144 B2Granted
Downhole tubular inspection combining partial saturation and remote field eddy currents
AssigneeHalliburton Energy Services, Inc.
InventorsJunwen Dai, Ahmed E. Fouda, Freeman Lee Hill, III, Christopher Michael Jones
Life of this patent
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Abstract
A system may include an electromagnetic (EM) logging tool for inspecting downhole tubulars. The EM logging tool may include a mandrel, at least one low-frequency transmitter coil disposed on the mandrel, at least one-low frequency receiver coil disposed on the mandrel, and at least one-high frequency sensor configured to measure one or more electromagnetic properties of a tubular.
Claims20
A downhole tubular inspection tool, comprising:
- a tool body configured for lowering into an inner tubular on a conveyance;
- a low-frequency sensor module including a low-frequency transmitter coil and a low-frequency receiver coil disposed along the tool body, wherein the low-frequency transmitter coil and receiver coil are operable within a first frequency range to measure electromagnetic properties of one or more outer tubulars disposed around the inner tubular;
- and
- at least one high-frequency sensor module operable within a second frequency range greater than the first frequency range for measuring electromagnetic properties of the inner tubular.
1 more element
A method for inspecting nested downhole tubulars, comprising:
- conveying a logging tool having both a low-frequency transmitter and receiver and a high-frequency sensor module through a plurality of downhole tubulars comprising an inner tubular and one or more outer tubulars disposed around the inner tubular;
- operating the low-frequency transmitter and receiver on the logging tool within a first frequency range to log low-frequency measurements of the one or more outer tubulars;
- operating the high-frequency sensor module on the logging tool in a second frequency range of greater than the first frequency range to log high-frequency measurements of at least the inner tubular;
- and
- inverting the low-frequency measurements to determine tubular parameters of one or more of the downhole tubulars, wherein the inversion is based in part on the high-frequency measurements logged by the high-frequency sensor.
2 more elements
A method for inspecting nested downhole tubulars, comprising:
- conveying a logging tool having both a low-frequency transmitter and receiver and a high-frequency sensor module through a plurality of downhole tubulars comprising an inner tubular and one or more outer tubulars disposed around the inner tubular;
- operating the low-frequency transmitter and receiver within a first frequency range to log low-frequency measurements of the one or more outer tubulars;
- operating the high-frequency sensor module in a second frequency range of greater than the first frequency range to log high-frequency measurements of at least the inner tubular;
- inverting the low-frequency measurements to determine tubular parameters of one or more of the downhole tubulars includes determining one or both of a magnetic permeability and an electrical conductivity of the downhole tubulars and an eccentricity of the inner tubular with respect to one of the outer tubulars;
- and
- processing the high-frequency measurements to determine a wall thickness and size of anomalies in the inner tubular, wherein this processing is based in part on one of a magnetic permeability, electrical conductivity, and eccentricity determined from the low-frequency measurements.
3 more elements
A method for inspecting nested downhole tubulars, comprising:
- conveying a logging tool having both a low-frequency transmitter and receiver and a high-frequency sensor module through a plurality of downhole tubulars comprising an inner tubular and one or more outer tubulars disposed around the inner tubular;
- operating a low-frequency transmitter and receiver within a first frequency range to log omni-directional low-frequency measurements of the one or more outer tubulars;
- operating a high-frequency sensor module in a second frequency range of greater than the first frequency range to obtain a directional log of high-frequency measurements of at least the inner tubular, using multiple partial saturation eddy current (PSEC) sensors on sensor pads to provide directional sensitivity and a gyroscope or accelerometer information to put measurements on angle;
- processing the low-frequency logs using inversion to determine an eccentricity ratio of the inner tubular with respect to one or more of the outer tubulars;
- processing the high-frequency directional log to determine an eccentricity azimuth angle of the inner tubular with respect to one or more of the outer tubulars by comparing variations in electromagnetic signals at a given depth with a baseline signal obtained from the inner tubular;
- and
- combining logs of eccentricity ratio and eccentricity azimuth angle to construct a 3D mapping of the trajectories of the downhole tubulars.
4 more elements
Dependencies are inferred from the claim text.