Downhole downlinking system employing a differential pressure transducer
AssigneeSchlumberger Technology Corporation
InventorsRuchir S. Patwa, Pralay Das, Junichi Sugiura
Life of this patent
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Abstract
A downhole tool includes a downlinking system deployed in a downhole tool body having an internal through bore. The downlinking system includes a differential pressure transducer configured to measured a pressure difference between drilling fluid in the internal through bore and drilling fluid external to the tool (in the borehole annulus). The differential transducer is electrically connected with an electronic controller (deployed substantially anywhere in the drill string) that is configured to receive and decode pressure waveforms.
Claims26
-20. (canceled)
A method, comprising:
- deploying a differential transducer in a longitudinal bore in a pressure housing to form a downlinking system;
- disposing the downlinking system in a downhole tool body;
- forming a pressure tight seal with a bulkhead deployed in the longitudinal bore;
- and
- electrically connecting the bulkhead with the differential transducer.
A method, comprising:
- deploying a pressure housing on a tool body including an internal through bore;
- deploying a differential transducer in the pressure housing, the differential transducer having first and second sides, the first side of the differential transducer being in fluid communication with the through bore;
- deploying a compensating piston in a cavity in the pressure housing, the piston and the cavity defining first and second fluid chambers, the first fluid chamber being in fluid communication with an external portion of the tool, the second fluid chamber being in fluid communication with the second side of the differential transducer;
- and
- forming a first bore in the tool body and a second bore in the pressure housing to provide fluid communication between the through bore and the first side of the differential transducer.
Dependencies are inferred from the claim text.