Downhole downlinking system employing a differential pressure transducer

摘要

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.

主权项

1. 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 such that the differential transducer is disposed to measure a pressure difference between fluid internal to the tool body and fluid external to the tool body; forming a pressure tight seal with a bulkhead deployed in the longitudinal bore; and electrically connecting the bulkhead with the differential transducer.