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Title: Acoustic data transmission through a drillstring

Abstract

A method and apparatus for acoustically transmitting data along a drillstring are presented. In accordance with one embodiment of the present invention, acoustic data signals are conditioned to counteract distortions caused by the drillstring. Preferably, this conditioning step comprises multiplying each frequency component of the data signal by exp ([minus]ikL) where L is the transmission length of the drillstring, k is the wave number in the drillstring at the frequency of each component and i is ([minus]1)[sup 1/2]. In another embodiment of this invention, data signals having a frequency content in at least one passband of the drillstring are generated preferably traveling in only one direction (e.g., up the drillstring) while echoes in the drillstring resulting from the data transmission are suppressed. 20 figs.

Inventors:
Issue Date:
OSTI Identifier:
7067107
Patent Number(s):
5128901 A
Application Number:
PPN: US 7-605255
Assignee:
Teleco Oilfield Services Inc., Meriden, CT (United States) SNL; EDB-94-090503
DOE Contract Number:  
AC04-76DP00789
Resource Type:
Patent
Resource Relation:
Patent File Date: 29 Oct 1990
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; DATA TRANSMISSION SYSTEMS; DESIGN; MWD SYSTEMS; OPERATION; SIGNAL CONDITIONING; SOUND WAVES; 440400* - Well Logging Instrumentation

Citation Formats

Drumheller, D.S. Acoustic data transmission through a drillstring. United States: N. p., 1992. Web.
Drumheller, D.S. Acoustic data transmission through a drillstring. United States.
Drumheller, D.S. Tue . "Acoustic data transmission through a drillstring". United States.
@article{osti_7067107,
title = {Acoustic data transmission through a drillstring},
author = {Drumheller, D.S.},
abstractNote = {A method and apparatus for acoustically transmitting data along a drillstring are presented. In accordance with one embodiment of the present invention, acoustic data signals are conditioned to counteract distortions caused by the drillstring. Preferably, this conditioning step comprises multiplying each frequency component of the data signal by exp ([minus]ikL) where L is the transmission length of the drillstring, k is the wave number in the drillstring at the frequency of each component and i is ([minus]1)[sup 1/2]. In another embodiment of this invention, data signals having a frequency content in at least one passband of the drillstring are generated preferably traveling in only one direction (e.g., up the drillstring) while echoes in the drillstring resulting from the data transmission are suppressed. 20 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1992},
month = {7}
}