Image Enhancement for Resistivity Features in Oil-Based Mud Image
AssigneeBaker Hughes Incorporated
InventorJinsong Zhao
Life of this patent
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Abstract
Resistivity images obtained by an imaging device in a borehole having oil-based mud may be of poor quality due to standoff variations, leakage currents and random noise. By processing the data using steps including median filtering, entropy equalization and bandpass filtering, the image quality can be considerably improved.
Claims22
A method of evaluating an earth formation, the method comprising:
- conveying a carrier into a borehole;
- making measurements indicative of a property of the earth formation using an array of sensors on each of a plurality of support members coupled to the carrier wherein at least one of the plurality of support members has a different standoff than at least one other of the plurality of support members;
- and
- using a processor for compensating for an effect on the measurements of the difference in standoff and producing an image of the earth formation.
An apparatus configured to evaluate an earth formation, the apparatus comprising:
- a carrier configured to be conveyed into a borehole;
- an array of sensors on each of a plurality of support members coupled to the carrier, each of the arrays of sensors being configured to make measurements indicative of a property of the earth wherein at least one of the plurality of support members has a different standoff than at least one other of the plurality of support member;
- and
- a processor configured to:
- compensate for an effect on the measurements of the difference in standoff and;
- and
- produce an image of the earth formation.
A non-transitory computer-readable medium product having thereon instructions that when read by a processor cause the processor to execute a method, the method comprising:
- compensating for an effect on measurements indicative of a property of an earth formation made by an array of sensors on each of a plurality of support members conveyed in a borehole of a difference in standoff of the support members and producing an image of the earth formation.
Dependencies are inferred from the claim text.