Apparatus and method for temperature independent balancing of a tool
AssigneeHalliburton Energy Services, Inc.
InventorsLuis Emilio San Martin, Shanjun Li, Burkay Donderici, Wesley N. Ludwig
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Abstract
Various embodiments include methods and apparatus structured to balance electrode pairs (112, 312) of a tool (105, 305) providing voltage equivalence between the electrode pairs. An electrically conductive wire (113, 313) coupling the electrodes of an electrode pair can be arranged such that resistance of the electrically conductive wire does not adversely affect the voltage equivalence. The electrically conductive wire can also be structured to provide temperature independent balancing by arranging the electrically conductive wire with respect to a measuring node (116, 316). Additional apparatus, systems, and methods are disclosed.
Claims30
An apparatus comprising:
- a first electrode and a second electrode arranged on substantially opposite sides of a reference location on a tool having a longitudinal axis, the first electrode spaced apart from the second electrode along a length of the longitudinal axis of the tool;
- an electrically conductive wire coupling the first electrode to the second electrode, the electrically conductive wire having one or more wire segments;
- and
- a node connected to the electrically conductive wire such that a first resistance of the electrically conductive wire from the first electrode to the node substantially equals a second resistance of the electrically conductive wire from the second electrode to the node, over a temperature range of operation of the tool,
- wherein the electrically conductive wire includes two wire segments connecting the first electrode to the second electrode such that length, cross-sectional area along the length, and resistivity of conductive material in each of the two wire segments changes with temperature such that the equality of the first resistance with the second resistance is maintained with a homogeneous temperature distribution within the tool.
A method comprising:
- coupling a first electrode to a second electrode using an electrically conductive wire, with the first electrode and the second electrode arranged on opposite sides of a reference location on a tool having a longitudinal axis, the first electrode spaced apart from the second electrode along a length of the longitudinal axis of the tool, the electrically conductive wire having one or more wire segments;
- and
- coupling the electrically conductive wire to a node such that a first resistance of the electrically conductive wire from the first electrode to the node equals a second resistance of the electrically conductive wire from the second electrode to the node, over a temperature range of operation of the tool,
- wherein using the electrically conductive wire includes using electrically conductive wire having two wire segments connecting the first electrode to the second electrode such that length, cross-sectional area along the length, and resistivity of conductive material in each of the two wire segments changes with temperature such that the equality of the first resistance with the second resistance is maintained with a homogeneous temperature distribution within the tool.
Dependencies are inferred from the claim text.