Numerical modeling and interpretation of drillstring waves-Reference-Cited by-同舟云学术

Numerical modeling and interpretation of drillstring waves

Published:2001-09 Issue:5 Volume:66 Page:1569-1581
ISSN:0016-8033
Container-title:GEOPHYSICS
language:en
Short-container-title:GEOPHYSICS

Author:

Poletto Flavio¹,Malusa Massimo¹,Miranda Francesco²

Affiliation:

1. Istituto Nazionale di Oceanografia e di Geofisica Sperimentale—OGS, Borgo Grotta Gigante no. 42/c, 34010 Sgonico, Trieste, Italy. Emails:

2. Eni S.p.A.—Divisione Agip, via Europa Unita 3, 20097 S. Donato Milanese, Milano, Italy.

Abstract

Drill‐bit seismic and pilot seismograms contain drillstring periodicities from signal and environmental noise sources. These coherent components are similar in seismic‐while‐drilling correlations, and their joint contribution may cause distortions in signal processing. Numeric modeling of the drillstring transmission line is used to correctly interpret the axial and torsional events with similar propagating modes of signal and noise. The reflection coefficients are computed for drillstrings of arbitrary materials, and their average mechanical features are related to the axial and torsional group velocities obtained by the dispersion equations. Fitting of the periodical components in the real seismograms is used to automatically correct the drill‐bit pilot delays and to estimate the surface and downhole boundary conditions.

Publisher

Society of Exploration Geophysicists

Subject

Geochemistry and Petrology,Geophysics

Link

https://library.seg.org/doi/pdf/10.1190/1.1487102

Reference27 articles.

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