Apparatus and Method for Measuring Electrical Properties of an Underground Formation
AssigneeSchlumberger Technology Corporation
InventorsRichard Bloemenkamp, Andrew J. Hayman
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Abstract
The present disclosure provides an apparatus and method for measuring electrical properties of an underground formation surrounding a borehole. The apparatus preferably comprises a downhole tool positionable in the borehole, a sensor pad positionable on the downhole tool, and a plurality of electrodes mounted on the sensor pad and configured to face a wall of the borehole. The apparatus further comprises an insulating layer extending over at least a portion of the plurality of electrodes facing the wall of the borehole.
Claims17
An apparatus for measuring electrical properties of an underground formation surrounding a borehole, comprising:
- a downhole tool positionable in the borehole;
- a sensor pad positionable on the downhole tool;
- a plurality of electrodes mounted on the sensor pad and configured to face a wall of the borehole;
- and
- an insulating layer extending over at least a portion of the plurality of electrodes facing the wall of the borehole.
A method for measuring the electrical properties of an underground formation surrounding a borehole, comprising the steps of:
- positioning a downhole tool with a sensor pad thereon in the borehole, the sensor pad having insulation thereon;
- positioning the sensor pad in the borehole adjacent a wall of the borehole, the sensor pad having a plurality of electrodes for measuring the electrical properties of the formation mounted in the insulation on the sensor pad and configured to face the wall of the borehole, and having an insulating layer extending over at least a portion of the plurality of electrodes facing the wall of the borehole;
- and,
- configuring at least one of the plurality of electrodes to measure the electrical properties of the formation through the insulating layer.
Dependencies are inferred from the claim text.