Schlumberger Technology Corporation

Khalid Ouaaba

Tsutomu Yamate

Stephane Vannuffelen

Colin Allan Wilson

Juei Igarashi

Nalin Weerasinghe

Soon Seong Chee

Koichi Naito

Maduranga Liyanage

A method, apparatus and system for safe mode telemetry are provide. The method may include detecting a failure of an AC power supply, switching the AC power supply to a DC power supply, booting with a safe mode telemetry system by a control unit, and capturing downhole data for recording into a memory. The apparatus may include a telemetry cartridge, a control unit to detect a failure of an AC power supply, a DC power supply, and a switching device to change from the AC power supply to the DC power supply based on the control unit's detection of the failure in the AC power supply. The DC power supply of the apparatus may be used to power the telemetry cartridge after the detection of the failure. The system may further include a surface data acquisition unit and a downhole tool including the apparatus.

Method, apparatus and system for safe mode telemetry system

Subterranean oilfield high-temperature devices configured or designed to facilitate downhole monitoring and high data transmission rates with laser diodes that are configured for operation downhole, within a borehole, at temperatures in excess of 115 degrees centigrade without active cooling.

High-temperature downhole devices

A method for optically sampling characteristics of subsurface fluids within a wellhole using continuous, non-pulsed light transmitted downhole in optical fibers for both sampling and reference light channels for accurate attenuation compensation.

Logging system and method for in-situ fluids sensing through optical fiber with attenuation compensation

Growing community of inventors

Sagamihara, Japan

Khalid Ouaaba