Downhole sensing system using carbon nanotube FET
AssigneeSchlumberger Technology Corporation
InventorsHidetoshi Yoshiuchi, Tsutomu Yamate, John Ullo, Kazuhiko Matsumoto
Life of this patent
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Abstract
Subterranean sensing devices configured or designed for downhole use to sense a local condition in the well. The sensing devices comprise one or more transistor having at least one carbon nanotube field effect transistor (CNT FET) configured or designed for operation downhole, within a borehole.
Claims19
A subterranean tool downhole in a well traversing a formation, comprising:
- a sensing device configured or designed for downhole use to sense a local condition in the well, wherein
- the sensing device comprises one or more transistor, wherein
- the one or more transistor comprises at least one carbon nanotube field effect transistor (CNT FET) configured or designed for operation downhole, within a borehole;
- and
- the sensing device further comprises at least one optical device, wherein
- the optical device comprises the at least one CNT FET configured or designed to function as a photo-sensitive detector downhole, within a borehole.
A downhole chemical sensing system, comprising:
- a surface data acquisition unit comprising a surface telemetry unit;
- a downhole telemetry cartridge;
- a communications interface between the surface data acquisition unit and the downhole telemetry cartridge;
- a downhole tool;
- and
- a downhole electrical tool bus operatively connected between the downhole telemetry cartridge and the downhole tool, wherein
- the downhole tool comprises:
- a chemical sensing device configured or designed for downhole use to sense a local condition in a well, wherein
- the chemical sensing device comprises one or more carbon nanotube field effect transistor (CNT FET) configured or designed for operation downhole, within a borehole, to sense chemical characteristics.
A fluid analysis system configured to operate downhole at elevated temperatures in excess of about 115 degrees Celsius in a well traversing a formation, comprising:
- at least one optical sensor to measure signals of interest and determine properties of formation fluids downhole, within a borehole, wherein
- the at least one optical sensor comprises one or more carbon nanotube field effect transistor (CNT FET) configured or designed for operation downhole, within a borehole, as a photo-sensitive detector, the CNT FET being configured or designed for operation downhole, within a borehole, at temperatures in excess of about 115 degrees Celsius.
Dependencies are inferred from the claim text.