Halliburton Energy Services, Inc.

Arthur C H Cheng

Paul F Rodney

Batakrishna Mandal

Roland Edward Chemali

Ronald Johannes Dirksen

Georgios L Varsamis

Denis P Schmitt

Joakim Oscar Blanch

Tianrun Chen

Calvin W Kessler

A downhole telemetry well system transmits data at a high rate inside a tubular pipe by encoding signals on a Stoneley wave. Telemetry devices for the Stoneley mode are implemented in short pipe joints inserted at various intervals between the tubulars. Each telemetry device includes Stoneley transducers, which may act as a transmitter, receiver, or repeater. The Stoneley telemetry devices transmit and receive the Stoneley waves making up the carrier of the signal. The Stoneley telemetry devices may be powered by on-board batteries or via some remote power source.

Stoneley wave based pipe telemetry

Methods and apparatus are provided for reducing and/or substantially eliminating sensitivity mismatch of acoustic receivers used with acoustic sources to determine acoustic properties of geologic formations as a logging tool traverses the formations. Methods are directed to detecting waveform arrival times at receivers, determining places in a well where arrival times of waves are substantially the same at a plurality of receivers, and estimating effective receiver sensitivities and equalization factors using Stoneley wave amplitudes and windowed deconvolution of Stoneley waves. Methods are further directed to correcting wave amplitudes using estimated effective receiver sensitivities and equalization factors for receivers.

Adaptive equalization of downhole acoustic receivers

Growing community of inventors

Houston, TX, United States of America

Arthur C H Cheng