Schlumberger Technology Corporation

Services Petroliers Schlumberger

Schlumberger Holdings Limited

Prad Research and Development Limited

Colin A Wilson

Arthur H Hartog

Richard Timothy Coates

Francois M Auzerais

Douglas E Miller

Dominic Joseph Brady

Henry Menkiti

Tsutomu Yamate

Stephane Vannuffelen

John Richard Tulett

Ian Bradford

Ian David Richard Bradford

Soon Seong Chee

Bruno Gayral

Nicholas Fundytus

Robert Loov

Dominic Brady

A system and method are provided for monitoring a wellbore in a lateral section, during stimulation, with equipment enabling retrieval in many conditions. The method includes monitoring the wellbore with a distributed fiber optic sensor to determine one or more characteristics of the stimulation operation using detected backscattered optical signals on the distributed fiber optic sensor. The method also includes retrieving a cable by exerting a traction force. A downhole device is provided for receiving the cable and includes retainers to maintain the cable and also includes a weakpoint configured to break when subjected to a force along a longitudinal axis of the downhole device that is greater than a predetermined threshold. The system includes the cable having the distributed fiber optic sensor, the downhole device, and a surface monitoring system for determining the characteristic of the stimulation operation using detected backscattered optical signals on the distributed fiber optic sensor.

System and method of monitoring a downhole stimulation operation featuring retrievable cable

A fiber optic distributed vibration system for detecting seismic signals in an earth formation is provided. The system includes a fiber optic cable deployed in a borehole that extends into the earth formation and which is configured to react along its length to a seismic wave incident on the fiber optic cable from outside the borehole. An optical source launches an optical signal into the fiber optic cable while the seismic wave is incident thereon. A receiver detects coherent Rayleigh noise (CRN) produced in response to the optical signal. A processing circuit processes the detected CRN signal to determine characteristics of the earth formation.

Detection of seismic signals using fiber optic distributed sensors

A technique is designed to measure parameters of hydrophones, such as measurement of hydrophone acceleration canceling properties. The technique involves testing a selected hydrophone under conditions representative of the actual conditions in which the hydrophone is to be operated. By using the representative conditions, the acceleration canceling properties of the hydrophone and/or other parameters of the hydrophone are more accurately determined.

Method and apparatus for measuring a hydrophone parameter

Methods and apparatus for facilitating optical communications and sensing, with downhole optical or other sensors, in high temperature oilfield applications. The apparatus can include a downhole telemetry cartridge for downhole use at temperatures in excess of about 115 degrees Celsius. The apparatus can also include a downhole light source optically connected to the telemetry cartridge. The light source may include at least one remotely pumped laser optically connected to a surface pump laser via optical fiber(s). The remotely pumped laser may drive the downhole optical or other sensors for their operations.

Methods and systems for downhole telemetry

Single fiber optical telemetry systems and methods are disclosed. The methods and systems facilitate input and output via a single fiber optic interface. The optical telemetry systems and methods also facilitate faster data transmission rates between surface and downhole equipment in oilfield applications.

Methods and apparatus for single fiber optical telemetry

Growing community of inventors

Surrey, United Kingdom

Colin A Wilson