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US 7,458,420 B2Granted
Downhole measurement system and method
AssigneeSchlumberger Technology Corporation
InventorsEmmanuel Rioufol, Brian W. Cho, Mark W. Brockman, Philippe Gambier
Life of this patent
Estimating the term…
Abstract
A system and method is provided to measure a pressure or other characteristic at a source (e.g. a hydraulic power supply) and in or near a downhole tool. A comparison of the measurements is then made to verify that the system is operating according to desired parameters. In specific applications, the comparison can be made to ensure the supply of hydraulic fluid is reaching the downhole tool.
Claims19
A method for use in a well, comprising:
- measuring a characteristic of a supply of fluid used to actuate a downhole tool via a control line, the measuring being accomplished with a first sensor;
- measuring the characteristic with a second sensor in or near the downhole tool and spaced from the supply measurement, the downhole tool being actuated via the control line;
- locating the second sensor separate from the control line used to actuate the downhole tool;
- providing a comparison of the measurements output by the first and second sensors to determine for an operator whether fluid is properly supplied to the downhole tool;
- and
- verifying that the downhole tool has actuated using the comparison.
3 more elements
A method for use in a well, comprising:
- measuring a characteristic of a supply of fluid used to actuate a downhole tool via a control line, the measuring being accomplished with a first sensor;
- measuring the characteristic with a second sensor in or near the downhole tool and spaced from the supply measurement, the downhole tool being actuated via the control line;
- providing a comparison of the measurements output by the first and second sensors to determine for an operator whether fluid is properly supplied to the downhole tool;
- and
- verifying that the downhole tool has been actuated.
2 more elements
Dependencies are inferred from the claim text.