Schlumberger Technology Corporation

Pavel Annenkov

Liang Sun

Robert W Tennent

David Conn

Richard Hunter

Arnaud Jarrot

Scott Richard Woolston

Jiuping Chen

Andriy Gelman

Christopher Paul Reed

Milan Subotic

Melisa Lourdes Ramirez Tovar

Sam Soundar

Wei Zhou

A flow regulation system for downlink communication includes a fixed flow valve and a variable flow valve on a discharge line. A pressure sensor is located between the fixed flow valve and the variable flow valve. A sinusoidal communication flow pattern in the drilling fluid is generated by adjusting the position of the variable flow valve based on measured valve pressures from the pressure sensor.

Systems and methods for generating a downlink signal

A method for configuring telemetry transmission includes receiving a transmitted telemetry signal at the earth's surface. The received signal is selected and processed to compute a measured power spectral density (PSD). A theoretical PSD is computed of the transmitted signal at the known carrier frequency and processed in combination with the measured PSD to compute an attenuation factor of the transmitted signal at a plurality of frequencies.

Automated configuration of telemetry transmission

Communication between the surface and a downhole location, such as a bottomhole assembly and/or an RSS is performed by electromagnetic downlink. Electromagnetic signals are transmitted from the surface through the formation at a frequency of 8 Hz or greater. Electromagnetic signals are transmitted and received while drilling or during drilling activities. In this manner, information and instructions may be transmitted to the BHA while drilling.

Electromagnetic downlink while drilling

A method includes receiving a signal having a telemetry portion and a noise portion. The method may also include identifying one or more harmonic frequencies in the signal. The method may also include determining whether the one or more harmonic frequencies are in a predetermined frequency band. The method may also include determining whether a signal-to-noise ratio (SNR) of the signal is below a predetermined SNR threshold. The method may also include generating one or more notifications in response to the determination whether the one or more harmonic frequencies are in the predetermined frequency band and the determination whether the SNR is below the predetermined SNR threshold.

Pump harmonic noise advisor

A method, a non-transitory computer-readable medium, and a computing system are provided for determining a telemetry mode of a signal. A drilling telemetry signal is received from a downhole tool in a wellbore. A transformation is determined based at least partially upon the drilling telemetry signal. Multiple features are extracted based at least partially upon the transformation. A decision region is identified based at least partially upon the features. A telemetry parameter is identified based at least partially upon the decision region. A telemetry mode of the drilling telemetry signal is determined based at least partially upon the telemetry parameter. The drilling telemetry signal is decoded based at least partially upon the telemetry mode.

Data rate mismatch advisor

Growing community of inventors

Houston, TX, United States of America

Pavel Annenkov