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Fluid flow measurement device and method. In one embodiment, a tool comprises a rotating arm with a sensor pad to measure fluid flow into or out of the casing wall. The arm maintains the sensor pad in close proximity to the casing inner wall. The tool diameter is variable to allow the tool to traver

Fluid flow measurement device and method. In one embodiment, a tool comprises a rotating arm with a sensor pad to measure fluid flow into or out of the casing wall. The arm maintains the sensor pad in close proximity to the casing inner wall. The tool diameter is variable to allow the tool to traverse variable diameter casings and pass obstacles. The sensor pad comprises flow channels to direct the flow of fluid by electromagnetic sensors configured to detect conductive fluid flow.

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1. A conductive fluid flow measurement device comprising: a core enclosure having first, second, third and fourth sides;a first pole piece having a first face and disposed inside the first side the core enclosure;a second pole piece having a second face and disposed inside the second side of the cor

1. A conductive fluid flow measurement device comprising: a core enclosure having first, second, third and fourth sides;a first pole piece having a first face and disposed inside the first side the core enclosure;a second pole piece having a second face and disposed inside the second side of the core enclosure opposite the first side, wherein the first and second faces face each other and are separated by a gap;one or more flow channels disposed from the third side of the core, through the gap, to the fourth side of the core opposite the fourth side; andone or more electrode pairs, wherein each electrode pair is disposed in a respective one of the one or more flow channels adjacent the gap, and wherein, for each electrode pair, an imaginary line between the two electrodes in the electrode pair is substantially parallel to the faces and substantially orthogonal to a flow axis of the respective flow channel. 2. The conductive fluid flow measurement device of claim 1, further comprising between about five and about twenty-five of the electrode pairs and respective flow channels, and wherein the flow channels are spaced along a length of the core enclosure. 3. The conductive fluid flow measurement device of claim 1, further comprising between about ten and about twenty of the electrode pairs and respective flow channels, and wherein the flow channels are spaced along a length of the core enclosure. 4. The conductive fluid flow measurement device of claim 1, further comprising a first coil disposed substantially around sides of the first pole piece and substantially parallel to the first face. 5. The conductive fluid flow measurement device of claim 4, further comprising a second coil disposed substantially around sides of the second pole piece and substantially parallel to the second face. 6. The conductive fluid flow measurement device of claim 5, further comprising a current source electrically connected to the first and second coils. 7. The conductive fluid flow measurement device of claim 1, wherein the core enclosure and the pole pieces comprise a high magnetic permeability material. 8. The conductive fluid flow measurement device of claim 1, further comprising a resistor electrically connecting the two electrodes of each of the electrode pairs to each other. 9. The conductive fluid flow measurement device of claim 1, wherein the two electrodes in each of the electrode pairs are spaced less than about 0.25 inches from each other. 10. The conductive fluid flow measurement device of claim 1, wherein the one or more flow channels have tapered inlets/outlets. 11. The conductive fluid flow measurement device of claim 1, further comprising a printed circuit board disposed externally to the core enclosure, wherein the one or more electrode pairs extend through one or more openings in the first side of the core and connect to a resistor network disposed on the printed circuit board. 12. The conductive fluid flow measurement device of claim 1, further comprising a potting material disposed inside the core enclosure, substantially filling any space not occupied by and the flow channels and any other components inside the enclosure. 13. The conductive fluid flow measurement device of claim 1, further comprising one or more electrical shields disposed between the one or more electrode pairs. 14. The conductive fluid flow measurement device of claim 1, wherein there are multiple electrode pairs and multiple respective flow channels. 15. The conductive fluid flow measurement device of claim 14, wherein the first and second pole pieces further comprise pole projections extending to the gap for each of the flow channels, and wherein there are recesses in the pole pieces between adjacent projections. 16. The conductive fluid flow measurement device of claim 14, wherein the electrode pairs are connected to each other in parallel. 17. A conductive fluid flow measurement device comprising: a core enclosure;first and second permanent magnets disposed adjacent the core enclosure; anda plurality of electromagnet conductive fluid sensors disposed in the core enclosure, each electromagnetic conductive fluid sensor comprising a first pole projection and a second pole projection disposed on the first and second permanent magnets, respectively, within the core enclosure and separated by a gap;a flow channel disposed within the core enclosure proximate to the gap, the flow channel having a flow axis passing through the gap; andan electrode pair disposed in the flow channel adjacent the gap, wherein an imaginary line between two electrodes in the electrode pair is substantially orthogonal to a magnetic field between the first and second pole projections, and substantially orthogonal to a flow axis of the flow channel. 18. The conductive fluid flow measurement device of claim 17, wherein the first and second permanent magnets are disposed inside the core enclosure. 19. The conductive fluid flow measurement device of claim 17, wherein the first and second permanent magnets are disposed outside the core enclosure. 20. The conductive fluid flow measurement device of claim 17, wherein the first and second permanent magnets comprise a material selected from the group consisting of: rare earth magnets, alnico magnets, and ceramic magnets. 21. The conductive fluid flow measurement device of claim 17, wherein the first and second pole projections comprise a ferromagnetic material. 22. The conductive fluid flow measurement device of claim 17, further comprising between about five and about twenty-five of the electromagnetic conductive fluid sensors spaced along a length of the core enclosure. 23. The conductive fluid flow measurement device of claim 17, further comprising between about ten and about twenty of the electromagnetic conductive fluid sensors spaced along a length of the core enclosure. 24. The conductive fluid flow measurement device of claim 17, further comprising a resistor electrically connecting the two electrodes to each other. 25. The conductive fluid flow measurement device of claim 17, wherein the two electrodes are spaced less than about 0.25 inches from each other. 26. The conductive fluid flow measurement device of claim 17, wherein the flow channel has a tapered inlet and tapered outlet. 27. The conductive fluid flow measurement device of claim 17, further comprising a printed circuit board disposed externally to the core enclosure, and wherein the electrode pair extends through one or more openings in the core enclosure and connects to a resistor disposed on the printed circuit board. 28. The conductive fluid flow measurement device of claim 17, further comprising a potting material disposed inside the core enclosure, substantially filling any space not occupied by and the flow channels and any other components inside the enclosure. 29. The conductive fluid flow measurement device of claim 17, further comprising electrical shields disposed between the electromagnetic conductive fluid sensors. 30. A conductive fluid flow measurement device comprising: first and second permanent magnets with opposite poles facing each other and separated by a gap;a plurality of flow channels disposed within the device proximate to the gap, and configured such that a conductive fluid flowing through at least one of the flow channels passes through the gap; anda plurality of electrode pairs disposed adjacent the gap along a length of the first and second permanent magnets, each one of the electrode pairs configured to generate a voltage difference when the conductive fluid flows through a respective one of the flow channels. 31. The conductive fluid flow measurement device of claim 30, further comprising electrical shields disposed between adjacent ones of the electrode pairs. 32. The conductive fluid flow measurement device of claim 30, wherein the first and second permanent magnets comprise a material selected from the group consisting of: rare earth magnets, alnico magnets, and ceramic magnets. 33. The conductive fluid flow measurement device of claim 30, further comprising between about five and about twenty-five of the electrode pairs and respective flow channels. 34. The conductive fluid flow measurement device of claim 30, further comprising between about ten and about twenty of the electrode pairs and respective flow channels. 35. The conductive fluid flow measurement device of claim 30, further comprising a resistor electrically connecting two electrodes in each electrode pair to each other. 36. The conductive fluid flow measurement device of claim 30, wherein two electrodes in each electrode pair are spaced less than about 0.25 inches from each other. 37. The conductive fluid flow measurement device of claim 30, wherein the flow channels have tapered inlets/outlets. 38. The conductive fluid flow measurement device of claim 30, further comprising a printed circuit board, wherein each electrode pair connects to a respective resistor disposed on the printed circuit board.